diff options
Diffstat (limited to 'doc/guides/prog_guide')
28 files changed, 6195 insertions, 39 deletions
diff --git a/doc/guides/prog_guide/cryptodev_lib.rst b/doc/guides/prog_guide/cryptodev_lib.rst index 75ae085f..2b338b92 100644 --- a/doc/guides/prog_guide/cryptodev_lib.rst +++ b/doc/guides/prog_guide/cryptodev_lib.rst @@ -539,12 +539,12 @@ chain. struct { uint8_t *data; - phys_addr_t phys_addr; + rte_iova_t phys_addr; } digest; /**< Digest parameters */ struct { uint8_t *data; - phys_addr_t phys_addr; + rte_iova_t phys_addr; } aad; /**< Additional authentication parameters */ } aead; @@ -566,7 +566,7 @@ chain. struct { uint8_t *data; - phys_addr_t phys_addr; + rte_iova_t phys_addr; } digest; /**< Digest parameters */ } auth; }; diff --git a/doc/guides/prog_guide/env_abstraction_layer.rst b/doc/guides/prog_guide/env_abstraction_layer.rst index fff1c063..9e834fc5 100644 --- a/doc/guides/prog_guide/env_abstraction_layer.rst +++ b/doc/guides/prog_guide/env_abstraction_layer.rst @@ -117,17 +117,6 @@ The physical address of the reserved memory for that memory zone is also returne Memory reservations done using the APIs provided by rte_malloc are also backed by pages from the hugetlbfs filesystem. -Xen Dom0 support without hugetbls -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - -The existing memory management implementation is based on the Linux kernel hugepage mechanism. -However, Xen Dom0 does not support hugepages, so a new Linux kernel module rte_dom0_mm is added to workaround this limitation. - -The EAL uses IOCTL interface to notify the Linux kernel module rte_dom0_mm to allocate memory of specified size, -and get all memory segments information from the module, -and the EAL uses MMAP interface to map the allocated memory. -For each memory segment, the physical addresses are contiguous within it but actual hardware addresses are contiguous within 2MB. - PCI Access ~~~~~~~~~~ @@ -164,7 +153,7 @@ which can trigger the generation of a core file, readable by gdb. CPU Feature Identification ~~~~~~~~~~~~~~~~~~~~~~~~~~ -The EAL can query the CPU at runtime (using the rte_cpu_get_feature() function) to determine which CPU features are available. +The EAL can query the CPU at runtime (using the rte_cpu_get_features() function) to determine which CPU features are available. User Space Interrupt Event ~~~~~~~~~~~~~~~~~~~~~~~~~~ diff --git a/doc/guides/prog_guide/event_ethernet_rx_adapter.rst b/doc/guides/prog_guide/event_ethernet_rx_adapter.rst new file mode 100644 index 00000000..4e722219 --- /dev/null +++ b/doc/guides/prog_guide/event_ethernet_rx_adapter.rst @@ -0,0 +1,168 @@ +.. BSD LICENSE + Copyright(c) 2017 Intel Corporation. All rights reserved. + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions + are met: + + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in + the documentation and/or other materials provided with the + distribution. + * Neither the name of Intel Corporation nor the names of its + contributors may be used to endorse or promote products derived + from this software without specific prior written permission. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +Event Ethernet Rx Adapter Library +================================= + +The DPDK Eventdev API allows the application to use an event driven programming +model for packet processing. In this model, the application polls an event +device port for receiving events that reference packets instead of polling Rx +queues of ethdev ports. Packet transfer between ethdev and the event device can +be supported in hardware or require a software thread to receive packets from +the ethdev port using ethdev poll mode APIs and enqueue these as events to the +event device using the eventdev API. Both transfer mechanisms may be present on +the same platform depending on the particular combination of the ethdev and +the event device. + +The Event Ethernet Rx Adapter library is intended for the application code to +configure both transfer mechanisms using a common API. A capability API allows +the eventdev PMD to advertise features supported for a given ethdev and allows +the application to perform configuration as per supported features. + +API Walk-through +---------------- + +This section will introduce the reader to the adapter API. The +application has to first instantiate an adapter which is associated with +a single eventdev, next the adapter instance is configured with Rx queues +that are either polled by a SW thread or linked using hardware support. Finally +the adapter is started. + +For SW based packet transfers from ethdev to eventdev, the adapter uses a +DPDK service function and the application is also required to assign a core to +the service function. + +Creating an Adapter Instance +~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +An adapter instance is created using ``rte_event_eth_rx_adapter_create()``. This +function is passed the event device to be associated with the adapter and port +configuration for the adapter to setup an event port if the adapter needs to use +a service function. + +.. code-block:: c + + int err; + uint8_t dev_id; + struct rte_event_dev_info dev_info; + struct rte_event_port_conf rx_p_conf; + + err = rte_event_dev_info_get(id, &dev_info); + + rx_p_conf.new_event_threshold = dev_info.max_num_events; + rx_p_conf.dequeue_depth = dev_info.max_event_port_dequeue_depth; + rx_p_conf.enqueue_depth = dev_info.max_event_port_enqueue_depth; + err = rte_event_eth_rx_adapter_create(id, dev_id, &rx_p_conf); + +If the application desires to have finer control of eventdev port allocation +and setup, it can use the ``rte_event_eth_rx_adapter_create_ext()`` function. +The ``rte_event_eth_rx_adapter_create_ext()`` function is passed a callback +function. The callback function is invoked if the adapter needs to use a +service function and needs to create an event port for it. The callback is +expected to fill the ``struct rte_event_eth_rx_adapter_conf structure`` +passed to it. + +Adding Rx Queues to the Adapter Instance +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +Ethdev Rx queues are added to the instance using the +``rte_event_eth_rx_adapter_queue_add()`` function. Configuration for the Rx +queue is passed in using a ``struct rte_event_eth_rx_adapter_queue_conf`` +parameter. Event information for packets from this Rx queue is encoded in the +``ev`` field of ``struct rte_event_eth_rx_adapter_queue_conf``. The +servicing_weight member of the struct rte_event_eth_rx_adapter_queue_conf +is the relative polling frequency of the Rx queue and is applicable when the +adapter uses a service core function. + +.. code-block:: c + + ev.queue_id = 0; + ev.sched_type = RTE_SCHED_TYPE_ATOMIC; + ev.priority = 0; + + queue_config.rx_queue_flags = 0; + queue_config.ev = ev; + queue_config.servicing_weight = 1; + + err = rte_event_eth_rx_adapter_queue_add(id, + eth_dev_id, + 0, &queue_config); + +Querying Adapter Capabilities +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +The ``rte_event_eth_rx_adapter_caps_get()`` function allows +the application to query the adapter capabilities for an eventdev and ethdev +combination. For e.g, if the ``RTE_EVENT_ETH_RX_ADAPTER_CAP_OVERRIDE_FLOW_ID`` +is set, the application can override the adapter generated flow ID in the event +using ``rx_queue_flags`` field in ``struct rte_event_eth_rx_adapter_queue_conf`` +which is passed as a parameter to the ``rte_event_eth_rx_adapter_queue_add()`` +function. + +.. code-block:: c + + err = rte_event_eth_rx_adapter_caps_get(dev_id, eth_dev_id, &cap); + + queue_config.rx_queue_flags = 0; + if (cap & RTE_EVENT_ETH_RX_ADAPTER_CAP_OVERRIDE_FLOW_ID) { + ev.flow_id = 1; + queue_config.rx_queue_flags = + RTE_EVENT_ETH_RX_ADAPTER_QUEUE_FLOW_ID_VALID; + } + +Configuring the Service Function +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +If the adapter uses a service function, the application is required to assign +a service core to the service function as show below. + +.. code-block:: c + + uint32_t service_id; + + if (rte_event_eth_rx_adapter_service_id_get(0, &service_id) == 0) + rte_service_map_lcore_set(service_id, RX_CORE_ID); + +Starting the Adapter Instance +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +The application calls ``rte_event_eth_rx_adapter_start()`` to start the adapter. +This function calls the start callbacks of the eventdev PMDs for hardware based +eventdev-ethdev connections and ``rte_service_run_state_set()`` to enable the +service function if one exists. + +Getting Adapter Statistics +~~~~~~~~~~~~~~~~~~~~~~~~~~ + +The ``rte_event_eth_rx_adapter_stats_get()`` function reports counters defined +in struct ``rte_event_eth_rx_adapter_stats``. The received packet and +enqueued event counts are a sum of the counts from the eventdev PMD callbacks +if the callback is supported, and the counts maintained by the service function, +if one exists. The service function also maintains a count of cycles for which +it was not able to enqueue to the event device. diff --git a/doc/guides/prog_guide/eventdev.rst b/doc/guides/prog_guide/eventdev.rst index 908d123a..be9fccdd 100644 --- a/doc/guides/prog_guide/eventdev.rst +++ b/doc/guides/prog_guide/eventdev.rst @@ -217,7 +217,7 @@ calling the setup function. Repeat this step for each queue, starting from .. code-block:: c struct rte_event_queue_conf atomic_conf = { - .event_queue_cfg = RTE_EVENT_QUEUE_CFG_ATOMIC_ONLY, + .schedule_type = RTE_SCHED_TYPE_ATOMIC, .priority = RTE_EVENT_DEV_PRIORITY_NORMAL, .nb_atomic_flows = 1024, .nb_atomic_order_sequences = 1024, @@ -320,7 +320,7 @@ The following code shows how those packets can be enqueued into the eventdev: for (i = 0; i < nb_rx; i++) { ev[i].flow_id = mbufs[i]->hash.rss; ev[i].op = RTE_EVENT_OP_NEW; - ev[i].sched_type = RTE_EVENT_QUEUE_CFG_ATOMIC_ONLY; + ev[i].sched_type = RTE_SCHED_TYPE_ATOMIC; ev[i].queue_id = 0; ev[i].event_type = RTE_EVENT_TYPE_ETHDEV; ev[i].sub_event_type = 0; diff --git a/doc/guides/prog_guide/flow_classify_lib.rst b/doc/guides/prog_guide/flow_classify_lib.rst new file mode 100644 index 00000000..820dc72a --- /dev/null +++ b/doc/guides/prog_guide/flow_classify_lib.rst @@ -0,0 +1,427 @@ +.. BSD LICENSE + Copyright(c) 2017 Intel Corporation. All rights reserved. + All rights reserved. + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions + are met: + + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in + the documentation and/or other materials provided with the + distribution. + * Neither the name of Intel Corporation nor the names of its + contributors may be used to endorse or promote products derived + from this software without specific prior written permission. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +Flow Classification Library +=========================== + +DPDK provides a Flow Classification library that provides the ability +to classify an input packet by matching it against a set of Flow rules. + +The initial implementation supports counting of IPv4 5-tuple packets which match +a particular Flow rule only. + +Please refer to the +:doc:`./rte_flow` +for more information. + +The Flow Classification library uses the ``librte_table`` API for managing Flow +rules and matching packets against the Flow rules. +The library is table agnostic and can use the following tables: +``Access Control List``, ``Hash`` and ``Longest Prefix Match(LPM)``. +The ``Access Control List`` table is used in the initial implementation. + +Please refer to the +:doc:`./packet_framework` +for more information.on ``librte_table``. + +DPDK provides an Access Control List library that provides the ability to +classify an input packet based on a set of classification rules. + +Please refer to the +:doc:`./packet_classif_access_ctrl` +library for more information on ``librte_acl``. + +There is also a Flow Classify sample application which demonstrates the use of +the Flow Classification Library API's. + +Please refer to the +:doc:`../sample_app_ug/flow_classify` +for more information on the ``flow_classify`` sample application. + +Overview +-------- + +The library has the following API's + +.. code-block:: c + + /** + * Flow classifier create + * + * @param params + * Parameters for flow classifier creation + * @return + * Handle to flow classifier instance on success or NULL otherwise + */ + struct rte_flow_classifier * + rte_flow_classifier_create(struct rte_flow_classifier_params *params); + + /** + * Flow classifier free + * + * @param cls + * Handle to flow classifier instance + * @return + * 0 on success, error code otherwise + */ + int + rte_flow_classifier_free(struct rte_flow_classifier *cls); + + /** + * Flow classify table create + * + * @param cls + * Handle to flow classifier instance + * @param params + * Parameters for flow_classify table creation + * @param table_id + * Table ID. Valid only within the scope of table IDs of the current + * classifier. Only returned after a successful invocation. + * @return + * 0 on success, error code otherwise + */ + int + rte_flow_classify_table_create(struct rte_flow_classifier *cls, + struct rte_flow_classify_table_params *params, + uint32_t *table_id); + + /** + * Add a flow classify rule to the flow_classifier table. + * + * @param[in] cls + * Flow classifier handle + * @param[in] table_id + * id of table + * @param[in] attr + * Flow rule attributes + * @param[in] pattern + * Pattern specification (list terminated by the END pattern item). + * @param[in] actions + * Associated actions (list terminated by the END pattern item). + * @param[out] error + * Perform verbose error reporting if not NULL. Structure + * initialised in case of error only. + * @return + * A valid handle in case of success, NULL otherwise. + */ + struct rte_flow_classify_rule * + rte_flow_classify_table_entry_add(struct rte_flow_classifier *cls, + uint32_t table_id, + const struct rte_flow_attr *attr, + const struct rte_flow_item pattern[], + const struct rte_flow_action actions[], + struct rte_flow_error *error); + + /** + * Delete a flow classify rule from the flow_classifier table. + * + * @param[in] cls + * Flow classifier handle + * @param[in] table_id + * id of table + * @param[in] rule + * Flow classify rule + * @return + * 0 on success, error code otherwise. + */ + int + rte_flow_classify_table_entry_delete(struct rte_flow_classifier *cls, + uint32_t table_id, + struct rte_flow_classify_rule *rule); + + /** + * Query flow classifier for given rule. + * + * @param[in] cls + * Flow classifier handle + * @param[in] table_id + * id of table + * @param[in] pkts + * Pointer to packets to process + * @param[in] nb_pkts + * Number of packets to process + * @param[in] rule + * Flow classify rule + * @param[in] stats + * Flow classify stats + * + * @return + * 0 on success, error code otherwise. + */ + int + rte_flow_classifier_query(struct rte_flow_classifier *cls, + uint32_t table_id, + struct rte_mbuf **pkts, + const uint16_t nb_pkts, + struct rte_flow_classify_rule *rule, + struct rte_flow_classify_stats *stats); + +Classifier creation +~~~~~~~~~~~~~~~~~~~ + +The application creates the ``Classifier`` using the +``rte_flow_classifier_create`` API. +The ``rte_flow_classify_params`` structure must be initialised by the +application before calling the API. + +.. code-block:: c + + struct rte_flow_classifier_params { + /** flow classifier name */ + const char *name; + + /** CPU socket ID where memory for the flow classifier and its */ + /** elements (tables) should be allocated */ + int socket_id; + + /** Table type */ + enum rte_flow_classify_table_type type; + }; + +The ``Classifier`` has the following internal structures: + +.. code-block:: c + + struct rte_table { + /* Input parameters */ + struct rte_table_ops ops; + uint32_t entry_size; + enum rte_flow_classify_table_type type; + + /* Handle to the low-level table object */ + void *h_table; + }; + + #define RTE_FLOW_CLASSIFIER_MAX_NAME_SZ 256 + + struct rte_flow_classifier { + /* Input parameters */ + char name[RTE_FLOW_CLASSIFIER_MAX_NAME_SZ]; + int socket_id; + enum rte_flow_classify_table_type type; + + /* Internal tables */ + struct rte_table tables[RTE_FLOW_CLASSIFY_TABLE_MAX]; + uint32_t num_tables; + uint16_t nb_pkts; + struct rte_flow_classify_table_entry + *entries[RTE_PORT_IN_BURST_SIZE_MAX]; + } __rte_cache_aligned; + +Adding a table to the Classifier +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +The application adds a table to the ``Classifier`` using the +``rte_flow_classify_table_create`` API. +The ``rte_flow_classify_table_params`` structure must be initialised by the +application before calling the API. + +.. code-block:: c + + struct rte_flow_classify_table_params { + /** Table operations (specific to each table type) */ + struct rte_table_ops *ops; + + /** Opaque param to be passed to the table create operation */ + void *arg_create; + + /** Memory size to be reserved per classifier object entry for */ + /** storing meta data */ + uint32_t table_metadata_size; + }; + +To create an ACL table the ``rte_table_acl_params`` structure must be +initialised and assigned to ``arg_create`` in the +``rte_flow_classify_table_params`` structure. + +.. code-block:: c + + struct rte_table_acl_params { + /** Name */ + const char *name; + + /** Maximum number of ACL rules in the table */ + uint32_t n_rules; + + /** Number of fields in the ACL rule specification */ + uint32_t n_rule_fields; + + /** Format specification of the fields of the ACL rule */ + struct rte_acl_field_def field_format[RTE_ACL_MAX_FIELDS]; + }; + +The fields for the ACL rule must also be initialised by the application. + +An ACL table can be added to the ``Classifier`` for each ACL rule, for example +another table could be added for the IPv6 5-tuple rule. + +Flow Parsing +~~~~~~~~~~~~ + +The library currently supports three IPv4 5-tuple flow patterns, for UDP, TCP +and SCTP. + +.. code-block:: c + + /* Pattern for IPv4 5-tuple UDP filter */ + static enum rte_flow_item_type pattern_ntuple_1[] = { + RTE_FLOW_ITEM_TYPE_ETH, + RTE_FLOW_ITEM_TYPE_IPV4, + RTE_FLOW_ITEM_TYPE_UDP, + RTE_FLOW_ITEM_TYPE_END, + }; + + /* Pattern for IPv4 5-tuple TCP filter */ + static enum rte_flow_item_type pattern_ntuple_2[] = { + RTE_FLOW_ITEM_TYPE_ETH, + RTE_FLOW_ITEM_TYPE_IPV4, + RTE_FLOW_ITEM_TYPE_TCP, + RTE_FLOW_ITEM_TYPE_END, + }; + + /* Pattern for IPv4 5-tuple SCTP filter */ + static enum rte_flow_item_type pattern_ntuple_3[] = { + RTE_FLOW_ITEM_TYPE_ETH, + RTE_FLOW_ITEM_TYPE_IPV4, + RTE_FLOW_ITEM_TYPE_SCTP, + RTE_FLOW_ITEM_TYPE_END, + }; + +The internal function ``flow_classify_parse_flow`` parses the +IPv4 5-tuple pattern, attributes and actions and returns the 5-tuple data in the +``rte_eth_ntuple_filter`` structure. + +.. code-block:: c + + static int + flow_classify_parse_flow( + const struct rte_flow_attr *attr, + const struct rte_flow_item pattern[], + const struct rte_flow_action actions[], + struct rte_flow_error *error) + +Adding Flow Rules +~~~~~~~~~~~~~~~~~ + +The ``rte_flow_classify_table_entry_add`` API creates an +``rte_flow_classify`` object which contains the flow_classify id and type, the +action, a union of add and delete keys and a union of rules. +It uses the ``flow_classify_parse_flow`` internal function for parsing the +flow parameters. +The 5-tuple ACL key data is obtained from the ``rte_eth_ntuple_filter`` +structure populated by the ``classify_parse_ntuple_filter`` function which +parses the Flow rule. + +.. code-block:: c + + struct acl_keys { + struct rte_table_acl_rule_add_params key_add; /* add key */ + struct rte_table_acl_rule_delete_params key_del; /* delete key */ + }; + + struct classify_rules { + enum rte_flow_classify_rule_type type; + union { + struct rte_flow_classify_ipv4_5tuple ipv4_5tuple; + } u; + }; + + struct rte_flow_classify { + uint32_t id; /* unique ID of classify object */ + struct rte_flow_action action; /* action when match found */ + struct classify_rules rules; /* union of rules */ + union { + struct acl_keys key; + } u; + int key_found; /* rule key found in table */ + void *entry; /* pointer to buffer to hold rule meta data */ + void *entry_ptr; /* handle to the table entry for rule meta data */ + }; + +It then calls the ``table[table_id].ops.f_add`` API to add the rule to the ACL +table. + +Deleting Flow Rules +~~~~~~~~~~~~~~~~~~~ + +The ``rte_flow_classify_table_entry_delete`` API calls the +``table[table_id].ops.f_delete`` API to delete a rule from the ACL table. + +Packet Matching +~~~~~~~~~~~~~~~ + +The ``rte_flow_classifier_query`` API is used to find packets which match a +given flow Flow rule in the table. +This API calls the flow_classify_run internal function which calls the +``table[table_id].ops.f_lookup`` API to see if any packets in a burst match any +of the Flow rules in the table. +The meta data for the highest priority rule matched for each packet is returned +in the entries array in the ``rte_flow_classify`` object. +The internal function ``action_apply`` implements the ``Count`` action which is +used to return data which matches a particular Flow rule. + +The rte_flow_classifier_query API uses the following structures to return data +to the application. + +.. code-block:: c + + /** IPv4 5-tuple data */ + struct rte_flow_classify_ipv4_5tuple { + uint32_t dst_ip; /**< Destination IP address in big endian. */ + uint32_t dst_ip_mask; /**< Mask of destination IP address. */ + uint32_t src_ip; /**< Source IP address in big endian. */ + uint32_t src_ip_mask; /**< Mask of destination IP address. */ + uint16_t dst_port; /**< Destination port in big endian. */ + uint16_t dst_port_mask; /**< Mask of destination port. */ + uint16_t src_port; /**< Source Port in big endian. */ + uint16_t src_port_mask; /**< Mask of source port. */ + uint8_t proto; /**< L4 protocol. */ + uint8_t proto_mask; /**< Mask of L4 protocol. */ + }; + + /** + * Flow stats + * + * For the count action, stats can be returned by the query API. + * + * Storage for stats is provided by the application. + * + * + */ + struct rte_flow_classify_stats { + void *stats; + }; + + struct rte_flow_classify_5tuple_stats { + /** count of packets that match IPv4 5tuple pattern */ + uint64_t counter1; + /** IPv4 5tuple data */ + struct rte_flow_classify_ipv4_5tuple ipv4_5tuple; + }; diff --git a/doc/guides/prog_guide/generic_segmentation_offload_lib.rst b/doc/guides/prog_guide/generic_segmentation_offload_lib.rst new file mode 100644 index 00000000..4bbf01a4 --- /dev/null +++ b/doc/guides/prog_guide/generic_segmentation_offload_lib.rst @@ -0,0 +1,257 @@ +.. BSD LICENSE + Copyright(c) 2017 Intel Corporation. All rights reserved. + All rights reserved. + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions + are met: + + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in + the documentation and/or other materials provided with the + distribution. + * Neither the name of Intel Corporation nor the names of its + contributors may be used to endorse or promote products derived + from this software without specific prior written permission. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +Generic Segmentation Offload Library +==================================== + +Overview +-------- +Generic Segmentation Offload (GSO) is a widely used software implementation of +TCP Segmentation Offload (TSO), which reduces per-packet processing overhead. +Much like TSO, GSO gains performance by enabling upper layer applications to +process a smaller number of large packets (e.g. MTU size of 64KB), instead of +processing higher numbers of small packets (e.g. MTU size of 1500B), thus +reducing per-packet overhead. + +For example, GSO allows guest kernel stacks to transmit over-sized TCP segments +that far exceed the kernel interface's MTU; this eliminates the need to segment +packets within the guest, and improves the data-to-overhead ratio of both the +guest-host link, and PCI bus. The expectation of the guest network stack in this +scenario is that segmentation of egress frames will take place either in the NIC +HW, or where that hardware capability is unavailable, either in the host +application, or network stack. + +Bearing that in mind, the GSO library enables DPDK applications to segment +packets in software. Note however, that GSO is implemented as a standalone +library, and not via a 'fallback' mechanism (i.e. for when TSO is unsupported +in the underlying hardware); that is, applications must explicitly invoke the +GSO library to segment packets. The size of GSO segments ``(segsz)`` is +configurable by the application. + +Limitations +----------- + +#. The GSO library doesn't check if input packets have correct checksums. + +#. In addition, the GSO library doesn't re-calculate checksums for segmented + packets (that task is left to the application). + +#. IP fragments are unsupported by the GSO library. + +#. The egress interface's driver must support multi-segment packets. + +#. Currently, the GSO library supports the following IPv4 packet types: + + - TCP + - VxLAN + - GRE + + See `Supported GSO Packet Types`_ for further details. + +Packet Segmentation +------------------- + +The ``rte_gso_segment()`` function is the GSO library's primary +segmentation API. + +Before performing segmentation, an application must create a GSO context object +``(struct rte_gso_ctx)``, which provides the library with some of the +information required to understand how the packet should be segmented. Refer to +`How to Segment a Packet`_ for additional details on same. Once the GSO context +has been created, and populated, the application can then use the +``rte_gso_segment()`` function to segment packets. + +The GSO library typically stores each segment that it creates in two parts: the +first part contains a copy of the original packet's headers, while the second +part contains a pointer to an offset within the original packet. This mechanism +is explained in more detail in `GSO Output Segment Format`_. + +The GSO library supports both single- and multi-segment input mbufs. + +GSO Output Segment Format +~~~~~~~~~~~~~~~~~~~~~~~~~ +To reduce the number of expensive memcpy operations required when segmenting a +packet, the GSO library typically stores each segment that it creates as a +two-part mbuf (technically, this is termed a 'two-segment' mbuf; however, since +the elements produced by the API are also called 'segments', for clarity the +term 'part' is used here instead). + +The first part of each output segment is a direct mbuf and contains a copy of +the original packet's headers, which must be prepended to each output segment. +These headers are copied from the original packet into each output segment. + +The second part of each output segment, represents a section of data from the +original packet, i.e. a data segment. Rather than copy the data directly from +the original packet into the output segment (which would impact performance +considerably), the second part of each output segment is an indirect mbuf, +which contains no actual data, but simply points to an offset within the +original packet. + +The combination of the 'header' segment and the 'data' segment constitutes a +single logical output GSO segment of the original packet. This is illustrated +in :numref:`figure_gso-output-segment-format`. + +.. _figure_gso-output-segment-format: + +.. figure:: img/gso-output-segment-format.svg + :align: center + + Two-part GSO output segment + +In one situation, the output segment may contain additional 'data' segments. +This only occurs when: + +- the input packet on which GSO is to be performed is represented by a + multi-segment mbuf. + +- the output segment is required to contain data that spans the boundaries + between segments of the input multi-segment mbuf. + +The GSO library traverses each segment of the input packet, and produces +numerous output segments; for optimal performance, the number of output +segments is kept to a minimum. Consequently, the GSO library maximizes the +amount of data contained within each output segment; i.e. each output segment +``segsz`` bytes of data. The only exception to this is in the case of the very +final output segment; if ``pkt_len`` % ``segsz``, then the final segment is +smaller than the rest. + +In order for an output segment to meet its MSS, it may need to include data from +multiple input segments. Due to the nature of indirect mbufs (each indirect mbuf +can point to only one direct mbuf), the solution here is to add another indirect +mbuf to the output segment; this additional segment then points to the next +input segment. If necessary, this chaining process is repeated, until the sum of +all of the data 'contained' in the output segment reaches ``segsz``. This +ensures that the amount of data contained within each output segment is uniform, +with the possible exception of the last segment, as previously described. + +:numref:`figure_gso-three-seg-mbuf` illustrates an example of a three-part +output segment. In this example, the output segment needs to include data from +the end of one input segment, and the beginning of another. To achieve this, +an additional indirect mbuf is chained to the second part of the output segment, +and is attached to the next input segment (i.e. it points to the data in the +next input segment). + +.. _figure_gso-three-seg-mbuf: + +.. figure:: img/gso-three-seg-mbuf.svg + :align: center + + Three-part GSO output segment + +Supported GSO Packet Types +-------------------------- + +TCP/IPv4 GSO +~~~~~~~~~~~~ +TCP/IPv4 GSO supports segmentation of suitably large TCP/IPv4 packets, which +may also contain an optional VLAN tag. + +VxLAN GSO +~~~~~~~~~ +VxLAN packets GSO supports segmentation of suitably large VxLAN packets, +which contain an outer IPv4 header, inner TCP/IPv4 headers, and optional +inner and/or outer VLAN tag(s). + +GRE GSO +~~~~~~~ +GRE GSO supports segmentation of suitably large GRE packets, which contain +an outer IPv4 header, inner TCP/IPv4 headers, and an optional VLAN tag. + +How to Segment a Packet +----------------------- + +To segment an outgoing packet, an application must: + +#. First create a GSO context ``(struct rte_gso_ctx)``; this contains: + + - a pointer to the mbuf pool for allocating the direct buffers, which are + used to store the GSO segments' packet headers. + + - a pointer to the mbuf pool for allocating indirect buffers, which are + used to locate GSO segments' packet payloads. + + .. note:: + + An application may use the same pool for both direct and indirect + buffers. However, since indirect mbufs simply store a pointer, the + application may reduce its memory consumption by creating a separate memory + pool, containing smaller elements, for the indirect pool. + + + - the size of each output segment, including packet headers and payload, + measured in bytes. + + - the bit mask of required GSO types. The GSO library uses the same macros as + those that describe a physical device's TX offloading capabilities (i.e. + ``DEV_TX_OFFLOAD_*_TSO``) for gso_types. For example, if an application + wants to segment TCP/IPv4 packets, it should set gso_types to + ``DEV_TX_OFFLOAD_TCP_TSO``. The only other supported values currently + supported for gso_types are ``DEV_TX_OFFLOAD_VXLAN_TNL_TSO``, and + ``DEV_TX_OFFLOAD_GRE_TNL_TSO``; a combination of these macros is also + allowed. + + - a flag, that indicates whether the IPv4 headers of output segments should + contain fixed or incremental ID values. + +2. Set the appropriate ol_flags in the mbuf. + + - The GSO library use the value of an mbuf's ``ol_flags`` attribute to + to determine how a packet should be segmented. It is the application's + responsibility to ensure that these flags are set. + + - For example, in order to segment TCP/IPv4 packets, the application should + add the ``PKT_TX_IPV4`` and ``PKT_TX_TCP_SEG`` flags to the mbuf's + ol_flags. + + - If checksum calculation in hardware is required, the application should + also add the ``PKT_TX_TCP_CKSUM`` and ``PKT_TX_IP_CKSUM`` flags. + +#. Check if the packet should be processed. Packets with one of the + following properties are not processed and are returned immediately: + + - Packet length is less than ``segsz`` (i.e. GSO is not required). + + - Packet type is not supported by GSO library (see + `Supported GSO Packet Types`_). + + - Application has not enabled GSO support for the packet type. + + - Packet's ol_flags have been incorrectly set. + +#. Allocate space in which to store the output GSO segments. If the amount of + space allocated by the application is insufficient, segmentation will fail. + +#. Invoke the GSO segmentation API, ``rte_gso_segment()``. + +#. If required, update the L3 and L4 checksums of the newly-created segments. + For tunneled packets, the outer IPv4 headers' checksums should also be + updated. 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v:horizAlign="1"/><v:tabList/>Flow Mask X</text> </g> + <g id="shape134-148" v:mID="134" v:groupContext="shape" transform="translate(481.5,-139.5)"> + <title>Sheet.134</title> + <desc>Flow Mask L</desc> + <v:textBlock v:margins="rect(4,4,4,4)"/> + <v:textRect cx="54" cy="319.5" width="108" height="9"/> + <rect x="0" y="315" width="108" height="9" class="st7"/> + <text x="19.12" y="323.7" class="st11" v:langID="1033"><v:paragraph v:horizAlign="1"/><v:tabList/>Flow Mask L</text> </g> + </g> +</svg> diff --git a/doc/guides/prog_guide/index.rst b/doc/guides/prog_guide/index.rst index 40f04a10..c4beb346 100644 --- a/doc/guides/prog_guide/index.rst +++ b/doc/guides/prog_guide/index.rst @@ -44,23 +44,29 @@ Programmer's Guide mbuf_lib poll_mode_drv rte_flow + traffic_metering_and_policing traffic_management cryptodev_lib + rte_security link_bonding_poll_mode_drv_lib timer_lib hash_lib efd_lib + member_lib lpm_lib lpm6_lib + flow_classify_lib packet_distrib_lib reorder_lib ip_fragment_reassembly_lib generic_receive_offload_lib + generic_segmentation_offload_lib pdump_lib multi_proc_support kernel_nic_interface thread_safety_dpdk_functions eventdev + event_ethernet_rx_adapter qos_framework power_man packet_classif_access_ctrl @@ -191,6 +197,19 @@ Programmer's Guide :numref:`figure_efd11` :ref:`figure_efd11` +:numref:`figure_membership1` :ref:`figure_membership1` + +:numref:`figure_membership2` :ref:`figure_membership2` + +:numref:`figure_membership3` :ref:`figure_membership3` + +:numref:`figure_membership4` :ref:`figure_membership4` + +:numref:`figure_membership5` :ref:`figure_membership5` + +:numref:`figure_membership6` :ref:`figure_membership6` + +:numref:`figure_membership7` :ref:`figure_membership7` **Tables** diff --git a/doc/guides/prog_guide/member_lib.rst b/doc/guides/prog_guide/member_lib.rst new file mode 100644 index 00000000..caca8dc2 --- /dev/null +++ b/doc/guides/prog_guide/member_lib.rst @@ -0,0 +1,420 @@ +.. BSD LICENSE + Copyright(c) 2017 Intel Corporation. All rights reserved. + All rights reserved. + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions + are met: + + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in + the documentation and/or other materials provided with the + distribution. + * Neither the name of Intel Corporation nor the names of its + contributors may be used to endorse or promote products derived + from this software without specific prior written permission. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + + +.. _member_library: + +Membership Library +================== + +Introduction +------------ + +The DPDK Membership Library provides an API for DPDK applications to insert a +new member, delete an existing member, or query the existence of a member in a +given set, or a group of sets. For the case of a group of sets, the library +will return not only whether the element has been inserted before in one of +the sets but also which set it belongs to. The Membership Library is an +extension and generalization of a traditional filter structure (for example +Bloom Filter [Member-bloom]) that has multiple usages in a wide variety of +workloads and applications. In general, the Membership Library is a data +structure that provides a "set-summary" on whether a member belongs to a set, +and as discussed in detail later, there are two advantages of using such a +set-summary rather than operating on a "full-blown" complete list of elements: +first, it has a much smaller storage requirement than storing the whole list of +elements themselves, and secondly checking an element membership (or other +operations) in this set-summary is much faster than checking it for the +original full-blown complete list of elements. + +We use the term "Set-Summary" in this guide to refer to the space-efficient, +probabilistic membership data structure that is provided by the library. A +membership test for an element will return the set this element belongs to or +that the element is "not-found" with very high probability of accuracy. Set-summary +is a fundamental data aggregation component that can be used in many network +(and other) applications. It is a crucial structure to address performance and +scalability issues of diverse network applications including overlay networks, +data-centric networks, flow table summaries, network statistics and +traffic monitoring. A set-summary is useful for applications who need to +include a list of elements while a complete list requires too much space +and/or too much processing cost. In these situations, the set-summary works as +a lossy hash-based representation of a set of members. It can dramatically +reduce space requirement and significantly improve the performance of set +membership queries at the cost of introducing a very small membership test error +probability. + +.. _figure_membership1: +.. figure:: img/member_i1.* + + Example Usages of Membership Library + +There are various usages for a Membership Library in a very +large set of applications and workloads. Interested readers can refer to +[Member-survey] for a survey of possible networking usages. The above figure +provide a small set of examples of using the Membership Library: + +* Sub-figure (a) + depicts a distributed web cache architecture where a collection of proxies + attempt to share their web caches (cached from a set of back-end web servers) to + provide faster responses to clients, and the proxies use the Membership + Library to share summaries of what web pages/objects they are caching. With the + Membership Library, a proxy receiving an http request will inquire the + set-summary to find its location and quickly determine whether to retrieve the + requested web page from a nearby proxy or from a back-end web server. + +* Sub-figure (b) depicts another example for using the Membership Library to + prevent routing loops which is typically done using slow TTL countdown and + dropping packets when TTL expires. As shown in Sub-figure (b), an embedded + set-summary in the packet header itself can be used to summarize the set of + nodes a packet has gone through, and each node upon receiving a packet can check + whether its id is a member of the set of visited nodes, and if it is, then a + routing loop is detected. + +* Sub-Figure (c) presents another usage of the Membership + Library to load-balance flows to worker threads with in-order guarantee where a + set-summary is used to query if a packet belongs to an existing flow or a new + flow. Packets belonging to a new flow are forwarded to the current least loaded + worker thread, while those belonging to an existing flow are forwarded to the + pre-assigned thread to guarantee in-order processing. + +* Sub-figure (d) highlights + yet another usage example in the database domain where a set-summary is used to + determine joins between sets instead of creating a join by comparing each + element of a set against the other elements in a different set, a join is done + on the summaries since they can efficiently encode members of a given set. + +Membership Library is a configurable library that is optimized to cover set +membership functionality for both a single set and multi-set scenarios. Two set-summary +schemes are presented including (a) vector of Bloom Filters and (b) Hash-Table based +set-summary schemes with and without false negative probability. +This guide first briefly describes these different types of set-summaries, usage examples for each, +and then it highlights the Membership Library API. + +Vector of Bloom Filters +----------------------- + +Bloom Filter (BF) [Member-bloom] is a well-known space-efficient +probabilistic data structure that answers set membership queries (test whether +an element is a member of a set) with some probability of false positives and +zero false negatives; a query for an element returns either it is "possibly in +a set" (with very high probability) or "definitely not in a set". + +The BF is a method for representing a set of ``n`` elements (for example flow keys +in network applications domain) to support membership queries. The idea of BF is +to allocate a bit-vector ``v`` with ``m`` bits, which are initially all set to 0. Then +it chooses ``k`` independent hash functions ``h1``, ``h2``, ... ``hk`` with hash values range from +``0`` to ``m-1`` to perform hashing calculations on each element to be inserted. Every time when an +element ``X`` being inserted into the set, the bits at positions ``h1(X)``, ``h2(X)``, ... +``hk(X)`` in ``v`` are set to 1 (any particular bit might be set to 1 multiple times +for multiple different inserted elements). Given a query for any element ``Y``, the +bits at positions ``h1(Y)``, ``h2(Y)``, ... ``hk(Y)`` are checked. If any of them is 0, +then Y is definitely not in the set. Otherwise there is a high probability that +Y is a member of the set with certain false positive probability. As shown in +the next equation, the false positive probability can be made arbitrarily small +by changing the number of hash functions (``k``) and the vector length (``m``). + +.. _figure_membership2: +.. figure:: img/member_i2.* + + Bloom Filter False Positive Probability + +Without BF, an accurate membership testing could involve a costly hash table +lookup and full element comparison. The advantage of using a BF is to simplify +the membership test into a series of hash calculations and memory accesses for a +small bit-vector, which can be easily optimized. Hence the lookup throughput +(set membership test) can be significantly faster than a normal hash table +lookup with element comparison. + +.. _figure_membership3: +.. figure:: img/member_i3.* + + Detecting Routing Loops Using BF + +BF is used for applications that need only one set, and the +membership of elements is checked against the BF. The example discussed +in the above figure is one example of potential applications that uses only one +set to capture the node IDs that have been visited so far by the packet. Each +node will then check this embedded BF in the packet header for its own id, and +if the BF indicates that the current node is definitely not in the set then a +loop-free route is guaranteed. + + +.. _figure_membership4: +.. figure:: img/member_i4.* + + Vector Bloom Filter (vBF) Overview + +To support membership test for both multiple sets and a single set, +the library implements a Vector Bloom Filter (vBF) scheme. +vBF basically composes multiple bloom filters into a vector of bloom filers. +The membership test is conducted on all of the +bloom filters concurrently to determine which set(s) it belongs to or none of +them. The basic idea of vBF is shown in the above figure where an element is +used to address multiple bloom filters concurrently and the bloom filter +index(es) with a hit is returned. + +.. _figure_membership5: +.. figure:: img/member_i5.* + + vBF for Flow Scheduling to Worker Thread + +As previously mentioned, there are many usages of such structures. vBF is used +for applications that need to check membership against multiple sets +simultaneously. The example shown in the above figure uses a set to capture +all flows being assigned for processing at a given worker thread. Upon receiving +a packet the vBF is used to quickly figure out if this packet belongs to a new flow +so as to be forwarded to the current least loaded worker thread, or otherwise it +should be queued for an existing thread to guarantee in-order processing (i.e. +the property of vBF to indicate right away that a given flow is a new one or +not is critical to minimize response time latency). + +It should be noted that vBF can be implemented using a set of single bloom +filters with sequential lookup of each BF. However, being able to concurrently +search all set-summaries is a big throughput advantage. In the library, certain +parallelism is realized by the implementation of checking all bloom filters +together. + + +Hash-Table based Set-Summaries +------------------------------ + +Hash-table based set-summary (HTSS) is another scheme in the membership library. +Cuckoo filter [Member-cfilter] is an example of HTSS. +HTSS supports multi-set membership testing like +vBF does. However, while vBF is better for a small number of targets, HTSS is more suitable +and can easily outperform vBF when the number of sets is +large, since HTSS uses a single hash table for membership testing while vBF +requires testing a series of Bloom Filters each corresponding to one set. +As a result, generally speaking vBF is more adequate for the case of a small limited number of sets +while HTSS should be used with a larger number of sets. + +.. _figure_membership6: +.. figure:: img/member_i6.* + + Using HTSS for Attack Signature Matching + +As shown in the above figure, attack signature matching where each set +represents a certain signature length (for correctness of this example, an +attack signature should not be a subset of another one) in the payload is a good +example for using HTSS with 0% false negative (i.e., when an element returns not +found, it has a 100% certainty that it is not a member of any set). The packet +inspection application benefits from knowing right away that the current payload +does not match any attack signatures in the database to establish its +legitimacy, otherwise a deep inspection of the packet is needed. + +HTSS employs a similar but simpler data structure to a traditional hash table, +and the major difference is that HTSS stores only the signatures but not the +full keys/elements which can significantly reduce the footprint of the table. +Along with the signature, HTSS also stores a value to indicate the target set. +When looking up an element, the element is hashed and the HTSS is addressed +to retrieve the signature stored. If the signature matches then the value is +retrieved corresponding to the index of the target set which the element belongs +to. Because signatures can collide, HTSS can still has false positive +probability. Furthermore, if elements are allowed to be +overwritten or evicted when the hash table becomes full, it will also have a +false negative probability. We discuss this case in the next section. + +Set-Summaries with False Negative Probability +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +As previously mentioned, traditional set-summaries (e.g. Bloom Filters) do not +have a false negative probability, i.e., it is 100% certain when an element +returns "not to be present" for a given set. However, the Membership Library +also supports a set-summary probabilistic data structure based on HTSS which +allows for false negative probability. + +In HTSS, when the hash table becomes full, keys/elements will fail to be added +into the table and the hash table has to be resized to accommodate for these new +elements, which can be expensive. However, if we allow new elements to overwrite +or evict existing elements (as a cache typically does), then the resulting +set-summary will begin to have false negative probability. This is because the +element that was evicted from the set-summary may still be present in the target +set. For subsequent inquiries the set-summary will falsely report the element +not being in the set, hence having a false negative probability. + +The major usage of HTSS with false negative is to use it as a cache for +distributing elements to different target sets. By allowing HTSS to evict old +elements, the set-summary can keep track of the most recent elements +(i.e. active) as a cache typically does. Old inactive elements (infrequently +used elements) will automatically and eventually get evicted from the +set-summary. It is worth noting that the set-summary still has false positive +probability, which means the application either can tolerate certain false positive +or it has fall-back path when false positive happens. + +.. _figure_membership7: +.. figure:: img/member_i7.* + + Using HTSS with False Negatives for Wild Card Classification + +HTSS with false negative (i.e. a cache) also has its wide set of applications. +For example wild card flow classification (e.g. ACL rules) highlighted in the +above figure is an example of such application. In that case each target set +represents a sub-table with rules defined by a certain flow mask. The flow masks +are non-overlapping, and for flows matching more than one rule only the highest +priority one is inserted in the corresponding sub-table (interested readers can +refer to the Open vSwitch (OvS) design of Mega Flow Cache (MFC) [Member-OvS] +for further details). Typically the rules will have a large number of distinct +unique masks and hence, a large number of target sets each corresponding to one +mask. Because the active set of flows varies widely based on the network +traffic, HTSS with false negative will act as a cache for <flowid, target ACL +sub-table> pair for the current active set of flows. When a miss occurs (as +shown in red in the above figure) the sub-tables will be searched sequentially +one by one for a possible match, and when found the flow key and target +sub-table will be inserted into the set-summary (i.e. cache insertion) so +subsequent packets from the same flow don’t incur the overhead of the +sequential search of sub-tables. + +Library API Overview +-------------------- + +The design goal of the Membership Library API is to be as generic as possible to +support all the different types of set-summaries we discussed in previous +sections and beyond. Fundamentally, the APIs need to include creation, +insertion, deletion, and lookup. + + +Set-summary Create +~~~~~~~~~~~~~~~~~~ + +The ``rte_member_create()`` function is used to create a set-summary structure, the input parameter +is a struct to pass in parameters that needed to initialize the set-summary, while the function returns the +pointer to the created set-summary or ``NULL`` if the creation failed. + +The general input arguments used when creating the set-summary should include ``name`` +which is the name of the created set-summary, *type* which is one of the types +supported by the library (e.g. ``RTE_MEMBER_TYPE_HT`` for HTSS or ``RTE_MEMBER_TYPE_VBF`` for vBF), and ``key_len`` +which is the length of the element/key. There are other parameters +are only used for certain type of set-summary, or which have a slightly different meaning for different types of set-summary. +For example, ``num_keys`` parameter means the maximum number of entries for Hash table based set-summary. +However, for bloom filter, this value means the expected number of keys that could be +inserted into the bloom filter(s). The value is used to calculate the size of each +bloom filter. + +We also pass two seeds: ``prim_hash_seed`` and +``sec_hash_seed`` for the primary and secondary hash functions to calculate two independent hash values. +``socket_id`` parameter is the NUMA socket ID for the memory used to create the +set-summary. For HTSS, another parameter ``is_cache`` is used to indicate +if this set-summary is a cache (i.e. with false negative probability) or not. +For vBF, extra parameters are needed. For example, ``num_set`` is the number of +sets needed to initialize the vector bloom filters. This number is equal to the +number of bloom filters will be created. +``false_pos_rate`` is the false positive rate. num_keys and false_pos_rate will be used to determine +the number of hash functions and the bloom filter size. + + +Set-summary Element Insertion +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +The ``rte_member_add()`` function is used to insert an element/key into a set-summary structure. If it fails an +error is returned. For success the returned value is dependent on the +set-summary mode to provide extra information for the users. For vBF +mode, a return value of 0 means a successful insert. For HTSS mode without false negative, the insert +could fail with ``-ENOSPC`` if the table is full. With false negative (i.e. cache mode), +for insert that does not cause any eviction (i.e. no overwriting happens to an +existing entry) the return value is 0. For insertion that causes eviction, the return +value is 1 to indicate such situation, but it is not an error. + +The input arguments for the function should include the ``key`` which is a pointer to the element/key that needs to +be added to the set-summary, and ``set_id`` which is the set id associated +with the key that needs to be added. + + +Set-summary Element Lookup +~~~~~~~~~~~~~~~~~~~~~~~~~~ + +The ``rte_member_lookup()`` function looks up a single key/element in the set-summary structure. It +returns as soon as the first match is found. The return value is 1 if a +match is found and 0 otherwise. The arguments for the function include ``key`` which is a pointer to the +element/key that needs to be looked up, and ``set_id`` which is used to return the +first target set id where the key has matched, if any. + +The ``rte_member_lookup_bulk()`` function is used to look up a bulk of keys/elements in the +set-summary structure for their first match. Each key lookup returns as soon as the first match is found. The +return value is the number of keys that find a match. The arguments of the function include ``keys`` +which is a pointer to a bulk of keys that are to be looked up, +``num_keys`` is the number +of keys that will be looked up, and ``set_ids`` are the return target set +ids for the first match found for each of the input keys. ``set_ids`` is an array +needs to be sized according to the ``num_keys``. If there is no match, the set id +for that key will be set to RTE_MEMBER_NO_MATCH. + +The ``rte_member_lookup_multi()`` function looks up a single key/element in the +set-summary structure for multiple matches. It +returns ALL the matches (possibly more than one) found for this key when it +is matched against all target sets (it is worth noting that for cache mode HTSS, +the current implementation matches at most one target set). The return value is +the number of matches +that was found for this key (for cache mode HTSS the return value +should be at most 1). The arguments for the function include ``key`` which is a pointer to the +element/key that needs to be looked up, ``max_match_per_key`` which is to indicate the maximum number of matches +the user expects to find for each key, and ``set_id`` which is used to return all +target set ids where the key has matched, if any. The ``set_id`` array should be sized +according to ``max_match_per_key``. For vBF, the maximum number of matches per key is equal +to the number of sets. For HTSS, the maximum number of matches per key is equal to two time +entry count per bucket. ``max_match_per_key`` should be equal or smaller than the maximum number of +possible matches. + +The ``rte_membership_lookup_multi_bulk()`` function looks up a bulk of keys/elements in the +set-summary structure for multiple matches, each key lookup returns ALL the matches (possibly more +than one) found for this key when it is matched against all target sets (cache mode HTSS +matches at most one target set). The +return value is the number of keys that find one or more matches in the +set-summary structure. The arguments of the +function include ``keys`` which is +a pointer to a bulk of keys that are to be looked up, ``num_keys`` is the number +of keys that will be looked up, ``max_match_per_key`` is the possible +maximum number of matches for each key, ``match_count`` which is the returned number +of matches for each key, and ``set_ids`` are the returned target set +ids for all matches found for each keys. ``set_ids`` is 2-D array +containing a 1-D array for each key (the size of 1-D array per key should be set by the user according to ``max_match_per_key``). +``max_match_per_key`` should be equal or smaller than the maximum number of +possible matches, similar to ``rte_member_lookup_multi``. + + +Set-summary Element Delete +~~~~~~~~~~~~~~~~~~~~~~~~~~ + +The ``rte_membership_delete()`` function deletes an element/key from a set-summary structure, if it fails +an error is returned. The input arguments should include ``key`` which is a pointer to the +element/key that needs to be deleted from the set-summary, and ``set_id`` +which is the set id associated with the key to delete. It is worth noting that current +implementation of vBF does not support deletion [1]_. An error code ``-EINVAL`` will be returned. + +.. [1] Traditional bloom filter does not support proactive deletion. Supporting proactive deletion require additional implementation and performance overhead. + +References +----------- + +[Member-bloom] B H Bloom, "Space/Time Trade-offs in Hash Coding with Allowable Errors," Communications of the ACM, 1970. + +[Member-survey] A Broder and M Mitzenmacher, "Network Applications of Bloom Filters: A Survey," in Internet Mathematics, 2005. + +[Member-cfilter] B Fan, D G Andersen and M Kaminsky, "Cuckoo Filter: Practically Better Than Bloom," in Conference on emerging Networking Experiments and Technologies, 2014. + +[Member-OvS] B Pfaff, "The Design and Implementation of Open vSwitch," in NSDI, 2015. diff --git a/doc/guides/prog_guide/poll_mode_drv.rst b/doc/guides/prog_guide/poll_mode_drv.rst index 1ac8f7eb..6a0c9f99 100644 --- a/doc/guides/prog_guide/poll_mode_drv.rst +++ b/doc/guides/prog_guide/poll_mode_drv.rst @@ -310,6 +310,26 @@ exported by each PMD. The list of flags and their precise meaning is described in the mbuf API documentation and in the in :ref:`Mbuf Library <Mbuf_Library>`, section "Meta Information". +Per-Port and Per-Queue Offloads +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +In the DPDK offload API, offloads are divided into per-port and per-queue offloads. +The different offloads capabilities can be queried using ``rte_eth_dev_info_get()``. +Supported offloads can be either per-port or per-queue. + +Offloads are enabled using the existing ``DEV_TX_OFFLOAD_*`` or ``DEV_RX_OFFLOAD_*`` flags. +Per-port offload configuration is set using ``rte_eth_dev_configure``. +Per-queue offload configuration is set using ``rte_eth_rx_queue_setup`` and ``rte_eth_tx_queue_setup``. +To enable per-port offload, the offload should be set on both device configuration and queue setup. +In case of a mixed configuration the queue setup shall return with an error. +To enable per-queue offload, the offload can be set only on the queue setup. +Offloads which are not enabled are disabled by default. + +For an application to use the Tx offloads API it should set the ``ETH_TXQ_FLAGS_IGNORE`` flag in the ``txq_flags`` field located in ``rte_eth_txconf`` struct. +In such cases it is not required to set other flags in ``txq_flags``. +For an application to use the Rx offloads API it should set the ``ignore_offload_bitfield`` bit in the ``rte_eth_rxmode`` struct. +In such cases it is not required to set other bitfield offloads in the ``rxmode`` struct. + Poll Mode Driver API -------------------- @@ -536,3 +556,43 @@ call. As an end result, the application is able to achieve its goal of monitoring a single statistic ("rx_errors" in this case), and if that shows packets being dropped, it can easily retrieve a "set" of statistics using the IDs array parameter to ``rte_eth_xstats_get_by_id`` function. + +NIC Reset API +~~~~~~~~~~~~~ + +.. code-block:: c + + int rte_eth_dev_reset(uint16_t port_id); + +Sometimes a port has to be reset passively. For example when a PF is +reset, all its VFs should also be reset by the application to make them +consistent with the PF. A DPDK application also can call this function +to trigger a port reset. Normally, a DPDK application would invokes this +function when an RTE_ETH_EVENT_INTR_RESET event is detected. + +It is the duty of the PMD to trigger RTE_ETH_EVENT_INTR_RESET events and +the application should register a callback function to handle these +events. When a PMD needs to trigger a reset, it can trigger an +RTE_ETH_EVENT_INTR_RESET event. On receiving an RTE_ETH_EVENT_INTR_RESET +event, applications can handle it as follows: Stop working queues, stop +calling Rx and Tx functions, and then call rte_eth_dev_reset(). For +thread safety all these operations should be called from the same thread. + +For example when PF is reset, the PF sends a message to notify VFs of +this event and also trigger an interrupt to VFs. Then in the interrupt +service routine the VFs detects this notification message and calls +_rte_eth_dev_callback_process(dev, RTE_ETH_EVENT_INTR_RESET, NULL, +NULL). This means that a PF reset triggers an RTE_ETH_EVENT_INTR_RESET +event within VFs. The function _rte_eth_dev_callback_process() will +call the registered callback function. The callback function can trigger +the application to handle all operations the VF reset requires including +stopping Rx/Tx queues and calling rte_eth_dev_reset(). + +The rte_eth_dev_reset() itself is a generic function which only does +some hardware reset operations through calling dev_unint() and +dev_init(), and itself does not handle synchronization, which is handled +by application. + +The PMD itself should not call rte_eth_dev_reset(). The PMD can trigger +the application to handle reset event. It is duty of application to +handle all synchronization before it calls rte_eth_dev_reset(). diff --git a/doc/guides/prog_guide/port_hotplug_framework.rst b/doc/guides/prog_guide/port_hotplug_framework.rst index ee765773..fb0efc18 100644 --- a/doc/guides/prog_guide/port_hotplug_framework.rst +++ b/doc/guides/prog_guide/port_hotplug_framework.rst @@ -101,10 +101,6 @@ Limitations * The framework can only be enabled with Linux. BSD is not supported. -* To detach a port, the port should be backed by a device that igb_uio - or VFIO manages. - * Not all PMDs support detaching feature. - To know whether a PMD can support detaching, search for the - "RTE_ETH_DEV_DETACHABLE" flag in rte_eth_dev::data::dev_flags. If the flag is - defined in the PMD, detaching is supported. + The underlying bus must support hot-unplug. If not supported, + the function ``rte_eth_dev_detach()`` will return negative ENOTSUP. diff --git a/doc/guides/prog_guide/power_man.rst b/doc/guides/prog_guide/power_man.rst index 114d0b1c..c5d62a39 100644 --- a/doc/guides/prog_guide/power_man.rst +++ b/doc/guides/prog_guide/power_man.rst @@ -89,6 +89,14 @@ Core state can be altered by speculative sleeps whenever the specified lcore has In the DPDK, if no packet is received after polling, speculative sleeps can be triggered according the strategies defined by the user space application. +Per-core Turbo Boost +-------------------- + +Individual cores can be allowed to enter a Turbo Boost state on a per-core +basis. This is achieved by enabling Turbo Boost Technology in the BIOS, then +looping through the relevant cores and enabling/disabling Turbo Boost on each +core. + API Overview of the Power Library --------------------------------- @@ -108,6 +116,10 @@ The main methods exported by power library are for CPU frequency scaling and inc * **Freq set**: Prompt the kernel to set the frequency for the specific lcore. +* **Enable turbo**: Prompt the kernel to enable Turbo Boost for the specific lcore. + +* **Disable turbo**: Prompt the kernel to disable Turbo Boost for the specific lcore. + User Cases ---------- diff --git a/doc/guides/prog_guide/profile_app.rst b/doc/guides/prog_guide/profile_app.rst index 54b546ac..ca1c91f6 100644 --- a/doc/guides/prog_guide/profile_app.rst +++ b/doc/guides/prog_guide/profile_app.rst @@ -39,7 +39,8 @@ Profiling on x86 ---------------- Intel processors provide performance counters to monitor events. -Some tools provided by Intel, such as VTune, can be used to profile and benchmark an application. +Some tools provided by Intel, such as Intel® VTune™ Amplifier, can be used +to profile and benchmark an application. See the *VTune Performance Analyzer Essentials* publication from Intel Press for more information. For a DPDK application, this can be done in a Linux* application environment only. @@ -59,6 +60,40 @@ Refer to the for details about application profiling. +Empty cycles tracing +~~~~~~~~~~~~~~~~~~~~ + +Iterations that yielded no RX packets (empty cycles, wasted iterations) can +be analyzed using VTune Amplifier. This profiling employs the +`Instrumentation and Tracing Technology (ITT) API +<https://software.intel.com/en-us/node/544195>`_ +feature of VTune Amplifier and requires only reconfiguring the DPDK library, +no changes in a DPDK application are needed. + +To trace wasted iterations on RX queues, first reconfigure DPDK with +``CONFIG_RTE_ETHDEV_RXTX_CALLBACKS`` and +``CONFIG_RTE_ETHDEV_PROFILE_ITT_WASTED_RX_ITERATIONS`` enabled. + +Then rebuild DPDK, specifying paths to the ITT header and library, which can +be found in any VTune Amplifier distribution in the *include* and *lib* +directories respectively: + +.. code-block:: console + + make EXTRA_CFLAGS=-I<path to ittnotify.h> \ + EXTRA_LDLIBS="-L<path to libittnotify.a> -littnotify" + +Finally, to see wasted iterations in your performance analysis results, +select the *"Analyze user tasks, events, and counters"* checkbox in the +*"Analysis Type"* tab when configuring analysis via VTune Amplifier GUI. +Alternatively, when running VTune Amplifier via command line, specify +``-knob enable-user-tasks=true`` option. + +Collected regions of wasted iterations will be marked on VTune Amplifier's +timeline as ITT tasks. These ITT tasks have predefined names, containing +Ethernet device and RX queue identifiers. + + Profiling on ARM64 ------------------ diff --git a/doc/guides/prog_guide/rte_flow.rst b/doc/guides/prog_guide/rte_flow.rst index 662a9123..d158be5e 100644 --- a/doc/guides/prog_guide/rte_flow.rst +++ b/doc/guides/prog_guide/rte_flow.rst @@ -187,7 +187,7 @@ Pattern item Pattern items fall in two categories: - Matching protocol headers and packet data (ANY, RAW, ETH, VLAN, IPV4, - IPV6, ICMP, UDP, TCP, SCTP, VXLAN, MPLS, GRE and so on), usually + IPV6, ICMP, UDP, TCP, SCTP, VXLAN, MPLS, GRE, ESP and so on), usually associated with a specification structure. - Matching meta-data or affecting pattern processing (END, VOID, INVERT, PF, @@ -955,6 +955,31 @@ Usage example, fuzzy match a TCPv4 packets: | 4 | END | +-------+----------+ +Item: ``GTP``, ``GTPC``, ``GTPU`` +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +Matches a GTPv1 header. + +Note: GTP, GTPC and GTPU use the same structure. GTPC and GTPU item +are defined for a user-friendly API when creating GTP-C and GTP-U +flow rules. + +- ``v_pt_rsv_flags``: version (3b), protocol type (1b), reserved (1b), + extension header flag (1b), sequence number flag (1b), N-PDU number + flag (1b). +- ``msg_type``: message type. +- ``msg_len``: message length. +- ``teid``: tunnel endpoint identifier. +- Default ``mask`` matches teid only. + +Item: ``ESP`` +^^^^^^^^^^^^^ + +Matches an ESP header. + +- ``hdr``: ESP header definition (``rte_esp.h``). +- Default ``mask`` matches SPI only. + Actions ~~~~~~~ @@ -972,7 +997,7 @@ They fall in three categories: additional processing by subsequent flow rules. - Other non-terminating meta actions that do not affect the fate of packets - (END, VOID, MARK, FLAG, COUNT). + (END, VOID, MARK, FLAG, COUNT, SECURITY). When several actions are combined in a flow rule, they should all have different types (e.g. dropping a packet twice is not possible). @@ -1354,6 +1379,101 @@ rule or if packets are not addressed to a VF in the first place. | ``vf`` | VF ID to redirect packets to | +--------------+--------------------------------+ +Action: ``METER`` +^^^^^^^^^^^^^^^^^ + +Applies a stage of metering and policing. + +The metering and policing (MTR) object has to be first created using the +rte_mtr_create() API function. The ID of the MTR object is specified as +action parameter. More than one flow can use the same MTR object through +the meter action. The MTR object can be further updated or queried using +the rte_mtr* API. + +- Non-terminating by default. + +.. _table_rte_flow_action_meter: + +.. table:: METER + + +--------------+---------------+ + | Field | Value | + +==============+===============+ + | ``mtr_id`` | MTR object ID | + +--------------+---------------+ + +Action: ``SECURITY`` +^^^^^^^^^^^^^^^^^^^^ + +Perform the security action on flows matched by the pattern items +according to the configuration of the security session. + +This action modifies the payload of matched flows. For INLINE_CRYPTO, the +security protocol headers and IV are fully provided by the application as +specified in the flow pattern. The payload of matching packets is +encrypted on egress, and decrypted and authenticated on ingress. +For INLINE_PROTOCOL, the security protocol is fully offloaded to HW, +providing full encapsulation and decapsulation of packets in security +protocols. The flow pattern specifies both the outer security header fields +and the inner packet fields. The security session specified in the action +must match the pattern parameters. + +The security session specified in the action must be created on the same +port as the flow action that is being specified. + +The ingress/egress flow attribute should match that specified in the +security session if the security session supports the definition of the +direction. + +Multiple flows can be configured to use the same security session. + +- Non-terminating by default. + +.. _table_rte_flow_action_security: + +.. table:: SECURITY + + +----------------------+--------------------------------------+ + | Field | Value | + +======================+======================================+ + | ``security_session`` | security session to apply | + +----------------------+--------------------------------------+ + +The following is an example of configuring IPsec inline using the +INLINE_CRYPTO security session: + +The encryption algorithm, keys and salt are part of the opaque +``rte_security_session``. The SA is identified according to the IP and ESP +fields in the pattern items. + +.. _table_rte_flow_item_esp_inline_example: + +.. table:: IPsec inline crypto flow pattern items. + + +-------+----------+ + | Index | Item | + +=======+==========+ + | 0 | Ethernet | + +-------+----------+ + | 1 | IPv4 | + +-------+----------+ + | 2 | ESP | + +-------+----------+ + | 3 | END | + +-------+----------+ + +.. _table_rte_flow_action_esp_inline_example: + +.. table:: IPsec inline flow actions. + + +-------+----------+ + | Index | Action | + +=======+==========+ + | 0 | SECURITY | + +-------+----------+ + | 1 | END | + +-------+----------+ + Negative types ~~~~~~~~~~~~~~ @@ -1401,7 +1521,7 @@ supported and can be created. .. code-block:: c int - rte_flow_validate(uint8_t port_id, + rte_flow_validate(uint16_t port_id, const struct rte_flow_attr *attr, const struct rte_flow_item pattern[], const struct rte_flow_action actions[], @@ -1456,7 +1576,7 @@ actually created and a handle returned. .. code-block:: c struct rte_flow * - rte_flow_create(uint8_t port_id, + rte_flow_create(uint16_t port_id, const struct rte_flow_attr *attr, const struct rte_flow_item pattern[], const struct rte_flow_action *actions[], @@ -1488,7 +1608,7 @@ performing this step before releasing resources. .. code-block:: c int - rte_flow_destroy(uint8_t port_id, + rte_flow_destroy(uint16_t port_id, struct rte_flow *flow, struct rte_flow_error *error); @@ -1519,7 +1639,7 @@ port. They are released as with successive calls to ``rte_flow_destroy()``. .. code-block:: c int - rte_flow_flush(uint8_t port_id, + rte_flow_flush(uint16_t port_id, struct rte_flow_error *error); In the unlikely event of failure, handles are still considered destroyed and @@ -1547,7 +1667,7 @@ definition. .. code-block:: c int - rte_flow_query(uint8_t port_id, + rte_flow_query(uint16_t port_id, struct rte_flow *flow, enum rte_flow_action_type action, void *data, @@ -1620,7 +1740,7 @@ port and may return errors such as ``ENOTSUP`` ("not supported"): .. code-block:: c int - rte_flow_isolate(uint8_t port_id, int set, struct rte_flow_error *error); + rte_flow_isolate(uint16_t port_id, int set, struct rte_flow_error *error); Arguments: @@ -1678,6 +1798,25 @@ freed by the application, however its pointer can be considered valid only as long as its associated DPDK port remains configured. Closing the underlying device or unloading the PMD invalidates it. +Helpers +------- + +Error initializer +~~~~~~~~~~~~~~~~~ + +.. code-block:: c + + static inline int + rte_flow_error_set(struct rte_flow_error *error, + int code, + enum rte_flow_error_type type, + const void *cause, + const char *message); + +This function initializes ``error`` (if non-NULL) with the provided +parameters and sets ``rte_errno`` to ``code``. A negative error ``code`` is +then returned. + Caveats ------- @@ -1743,13 +1882,11 @@ the legacy filtering framework, which should eventually disappear. whatsoever). They only make sure these callbacks are non-NULL or return the ``ENOSYS`` (function not supported) error. -This interface additionally defines the following helper functions: +This interface additionally defines the following helper function: - ``rte_flow_ops_get()``: get generic flow operations structure from a port. -- ``rte_flow_error_set()``: initialize generic flow error structure. - More will be added over time. Device compatibility diff --git a/doc/guides/prog_guide/rte_security.rst b/doc/guides/prog_guide/rte_security.rst new file mode 100644 index 00000000..71be036c --- /dev/null +++ b/doc/guides/prog_guide/rte_security.rst @@ -0,0 +1,564 @@ +.. BSD LICENSE + Copyright 2017 NXP. + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions + are met: + + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in + the documentation and/or other materials provided with the + distribution. + * Neither the name of NXP nor the names of its + contributors may be used to endorse or promote products derived + from this software without specific prior written permission. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + + +Security Library +================ + +The security library provides a framework for management and provisioning +of security protocol operations offloaded to hardware based devices. The +library defines generic APIs to create and free security sessions which can +support full protocol offload as well as inline crypto operation with +NIC or crypto devices. The framework currently only supports the IPSec protocol +and associated operations, other protocols will be added in future. + +Design Principles +----------------- + +The security library provides an additional offload capability to an existing +crypto device and/or ethernet device. + +.. code-block:: console + + +---------------+ + | rte_security | + +---------------+ + \ / + +-----------+ +--------------+ + | NIC PMD | | CRYPTO PMD | + +-----------+ +--------------+ + +.. note:: + + Currently, the security library does not support the case of multi-process. + It will be updated in the future releases. + +The supported offload types are explained in the sections below. + +Inline Crypto +~~~~~~~~~~~~~ + +RTE_SECURITY_ACTION_TYPE_INLINE_CRYPTO: +The crypto processing for security protocol (e.g. IPSec) is processed +inline during receive and transmission on NIC port. The flow based +security action should be configured on the port. + +Ingress Data path - The packet is decrypted in RX path and relevant +crypto status is set in Rx descriptors. After the successful inline +crypto processing the packet is presented to host as a regular Rx packet +however all security protocol related headers are still attached to the +packet. e.g. In case of IPSec, the IPSec tunnel headers (if any), +ESP/AH headers will remain in the packet but the received packet +contains the decrypted data where the encrypted data was when the packet +arrived. The driver Rx path check the descriptors and and based on the +crypto status sets additional flags in the rte_mbuf.ol_flags field. + +.. note:: + + The underlying device may not support crypto processing for all ingress packet + matching to a particular flow (e.g. fragmented packets), such packets will + be passed as encrypted packets. It is the responsibility of application to + process such encrypted packets using other crypto driver instance. + +Egress Data path - The software prepares the egress packet by adding +relevant security protocol headers. Only the data will not be +encrypted by the software. The driver will accordingly configure the +tx descriptors. The hardware device will encrypt the data before sending the +the packet out. + +.. note:: + + The underlying device may support post encryption TSO. + +.. code-block:: console + + Egress Data Path + | + +--------|--------+ + | egress IPsec | + | | | + | +------V------+ | + | | SADB lookup | | + | +------|------+ | + | +------V------+ | + | | Tunnel | | <------ Add tunnel header to packet + | +------|------+ | + | +------V------+ | + | | ESP | | <------ Add ESP header without trailer to packet + | | | | <------ Mark packet to be offloaded, add trailer + | +------|------+ | meta-data to mbuf + +--------V--------+ + | + +--------V--------+ + | L2 Stack | + +--------|--------+ + | + +--------V--------+ + | | + | NIC PMD | <------ Set hw context for inline crypto offload + | | + +--------|--------+ + | + +--------|--------+ + | HW ACCELERATED | <------ Packet Encryption and + | NIC | Authentication happens inline + | | + +-----------------+ + + +Inline protocol offload +~~~~~~~~~~~~~~~~~~~~~~~ + +RTE_SECURITY_ACTION_TYPE_INLINE_PROTOCOL: +The crypto and protocol processing for security protocol (e.g. IPSec) +is processed inline during receive and transmission. The flow based +security action should be configured on the port. + +Ingress Data path - The packet is decrypted in the RX path and relevant +crypto status is set in the Rx descriptors. After the successful inline +crypto processing the packet is presented to the host as a regular Rx packet +but all security protocol related headers are optionally removed from the +packet. e.g. in the case of IPSec, the IPSec tunnel headers (if any), +ESP/AH headers will be removed from the packet and the received packet +will contains the decrypted packet only. The driver Rx path checks the +descriptors and based on the crypto status sets additional flags in +``rte_mbuf.ol_flags`` field. + +.. note:: + + The underlying device in this case is stateful. It is expected that + the device shall support crypto processing for all kind of packets matching + to a given flow, this includes fragmented packets (post reassembly). + E.g. in case of IPSec the device may internally manage anti-replay etc. + It will provide a configuration option for anti-replay behavior i.e. to drop + the packets or pass them to driver with error flags set in the descriptor. + +Egress Data path - The software will send the plain packet without any +security protocol headers added to the packet. The driver will configure +the security index and other requirement in tx descriptors. +The hardware device will do security processing on the packet that includes +adding the relevant protocol headers and encrypting the data before sending +the packet out. The software should make sure that the buffer +has required head room and tail room for any protocol header addition. The +software may also do early fragmentation if the resultant packet is expected +to cross the MTU size. + + +.. note:: + + The underlying device will manage state information required for egress + processing. E.g. in case of IPSec, the seq number will be added to the + packet, however the device shall provide indication when the sequence number + is about to overflow. The underlying device may support post encryption TSO. + +.. code-block:: console + + Egress Data Path + | + +--------|--------+ + | egress IPsec | + | | | + | +------V------+ | + | | SADB lookup | | + | +------|------+ | + | +------V------+ | + | | Desc | | <------ Mark packet to be offloaded + | +------|------+ | + +--------V--------+ + | + +--------V--------+ + | L2 Stack | + +--------|--------+ + | + +--------V--------+ + | | + | NIC PMD | <------ Set hw context for inline crypto offload + | | + +--------|--------+ + | + +--------|--------+ + | HW ACCELERATED | <------ Add tunnel, ESP header etc header to + | NIC | packet. Packet Encryption and + | | Authentication happens inline. + +-----------------+ + + +Lookaside protocol offload +~~~~~~~~~~~~~~~~~~~~~~~~~~ + +RTE_SECURITY_ACTION_TYPE_LOOKASIDE_PROTOCOL: +This extends librte_cryptodev to support the programming of IPsec +Security Association (SA) as part of a crypto session creation including +the definition. In addition to standard crypto processing, as defined by +the cryptodev, the security protocol processing is also offloaded to the +crypto device. + +Decryption: The packet is sent to the crypto device for security +protocol processing. The device will decrypt the packet and it will also +optionally remove additional security headers from the packet. +E.g. in case of IPSec, IPSec tunnel headers (if any), ESP/AH headers +will be removed from the packet and the decrypted packet may contain +plain data only. + +.. note:: + + In case of IPSec the device may internally manage anti-replay etc. + It will provide a configuration option for anti-replay behavior i.e. to drop + the packets or pass them to driver with error flags set in descriptor. + +Encryption: The software will submit the packet to cryptodev as usual +for encryption, the hardware device in this case will also add the relevant +security protocol header along with encrypting the packet. The software +should make sure that the buffer has required head room and tail room +for any protocol header addition. + +.. note:: + + In the case of IPSec, the seq number will be added to the packet, + It shall provide an indication when the sequence number is about to + overflow. + +.. code-block:: console + + Egress Data Path + | + +--------|--------+ + | egress IPsec | + | | | + | +------V------+ | + | | SADB lookup | | <------ SA maps to cryptodev session + | +------|------+ | + | +------|------+ | + | | \--------------------\ + | | Crypto | | | <- Crypto processing through + | | /----------------\ | inline crypto PMD + | +------|------+ | | | + +--------V--------+ | | + | | | + +--------V--------+ | | create <-- SA is added to hw + | L2 Stack | | | inline using existing create + +--------|--------+ | | session sym session APIs + | | | | + +--------V--------+ +---|---|----V---+ + | | | \---/ | | <--- Add tunnel, ESP header etc + | NIC PMD | | INLINE | | header to packet.Packet + | | | CRYPTO PMD | | Encryption/Decryption and + +--------|--------+ +----------------+ Authentication happens + | inline. + +--------|--------+ + | NIC | + +--------|--------+ + V + +Device Features and Capabilities +--------------------------------- + +Device Capabilities For Security Operations +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +The device (crypto or ethernet) capabilities which support security operations, +are defined by the security action type, security protocol, protocol +capabilities and corresponding crypto capabilities for security. For the full +scope of the Security capability see definition of rte_security_capability +structure in the *DPDK API Reference*. + +.. code-block:: c + + struct rte_security_capability; + +Each driver (crypto or ethernet) defines its own private array of capabilities +for the operations it supports. Below is an example of the capabilities for a +PMD which supports the IPSec protocol. + +.. code-block:: c + + static const struct rte_security_capability pmd_security_capabilities[] = { + { /* IPsec Lookaside Protocol offload ESP Tunnel Egress */ + .action = RTE_SECURITY_ACTION_TYPE_LOOKASIDE_PROTOCOL, + .protocol = RTE_SECURITY_PROTOCOL_IPSEC, + .ipsec = { + .proto = RTE_SECURITY_IPSEC_SA_PROTO_ESP, + .mode = RTE_SECURITY_IPSEC_SA_MODE_TUNNEL, + .direction = RTE_SECURITY_IPSEC_SA_DIR_EGRESS, + .options = { 0 } + }, + .crypto_capabilities = pmd_capabilities + }, + { /* IPsec Lookaside Protocol offload ESP Tunnel Ingress */ + .action = RTE_SECURITY_ACTION_TYPE_LOOKASIDE_PROTOCOL, + .protocol = RTE_SECURITY_PROTOCOL_IPSEC, + .ipsec = { + .proto = RTE_SECURITY_IPSEC_SA_PROTO_ESP, + .mode = RTE_SECURITY_IPSEC_SA_MODE_TUNNEL, + .direction = RTE_SECURITY_IPSEC_SA_DIR_INGRESS, + .options = { 0 } + }, + .crypto_capabilities = pmd_capabilities + }, + { + .action = RTE_SECURITY_ACTION_TYPE_NONE + } + }; + static const struct rte_cryptodev_capabilities pmd_capabilities[] = { + { /* SHA1 HMAC */ + .op = RTE_CRYPTO_OP_TYPE_SYMMETRIC, + .sym = { + .xform_type = RTE_CRYPTO_SYM_XFORM_AUTH, + .auth = { + .algo = RTE_CRYPTO_AUTH_SHA1_HMAC, + .block_size = 64, + .key_size = { + .min = 64, + .max = 64, + .increment = 0 + }, + .digest_size = { + .min = 12, + .max = 12, + .increment = 0 + }, + .aad_size = { 0 }, + .iv_size = { 0 } + } + } + }, + { /* AES CBC */ + .op = RTE_CRYPTO_OP_TYPE_SYMMETRIC, + .sym = { + .xform_type = RTE_CRYPTO_SYM_XFORM_CIPHER, + .cipher = { + .algo = RTE_CRYPTO_CIPHER_AES_CBC, + .block_size = 16, + .key_size = { + .min = 16, + .max = 32, + .increment = 8 + }, + .iv_size = { + .min = 16, + .max = 16, + .increment = 0 + } + } + } + } + } + + +Capabilities Discovery +~~~~~~~~~~~~~~~~~~~~~~ + +Discovering the features and capabilities of a driver (crypto/ethernet) +is achieved through the ``rte_security_capabilities_get()`` function. + +.. code-block:: c + + const struct rte_security_capability *rte_security_capabilities_get(uint16_t id); + +This allows the user to query a specific driver and get all device +security capabilities. It returns an array of ``rte_security_capability`` structures +which contains all the capabilities for that device. + +Security Session Create/Free +~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +Security Sessions are created to store the immutable fields of a particular Security +Association for a particular protocol which is defined by a security session +configuration structure which is used in the operation processing of a packet flow. +Sessions are used to manage protocol specific information as well as crypto parameters. +Security sessions cache this immutable data in a optimal way for the underlying PMD +and this allows further acceleration of the offload of Crypto workloads. + +The Security framework provides APIs to create and free sessions for crypto/ethernet +devices, where sessions are mempool objects. It is the application's responsibility +to create and manage the session mempools. The mempool object size should be able to +accommodate the driver's private data of security session. + +Once the session mempools have been created, ``rte_security_session_create()`` +is used to allocate and initialize a session for the required crypto/ethernet device. + +Session APIs need a parameter ``rte_security_ctx`` to identify the crypto/ethernet +security ops. This parameter can be retrieved using the APIs +``rte_cryptodev_get_sec_ctx()`` (for crypto device) or ``rte_eth_dev_get_sec_ctx`` +(for ethernet port). + +Sessions already created can be updated with ``rte_security_session_update()``. + +When a session is no longer used, the user must call ``rte_security_session_destroy()`` +to free the driver private session data and return the memory back to the mempool. + +For look aside protocol offload to hardware crypto device, the ``rte_crypto_op`` +created by the application is attached to the security session by the API +``rte_security_attach_session()``. + +For Inline Crypto and Inline protocol offload, device specific defined metadata is +updated in the mbuf using ``rte_security_set_pkt_metadata()`` if +``DEV_TX_OFFLOAD_SEC_NEED_MDATA`` is set. + +Security session configuration +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +Security Session configuration structure is defined as ``rte_security_session_conf`` + +.. code-block:: c + + struct rte_security_session_conf { + enum rte_security_session_action_type action_type; + /**< Type of action to be performed on the session */ + enum rte_security_session_protocol protocol; + /**< Security protocol to be configured */ + union { + struct rte_security_ipsec_xform ipsec; + struct rte_security_macsec_xform macsec; + }; + /**< Configuration parameters for security session */ + struct rte_crypto_sym_xform *crypto_xform; + /**< Security Session Crypto Transformations */ + }; + +The configuration structure reuses the ``rte_crypto_sym_xform`` struct for crypto related +configuration. The ``rte_security_session_action_type`` struct is used to specify whether the +session is configured for Lookaside Protocol offload or Inline Crypto or Inline Protocol +Offload. + +.. code-block:: c + + enum rte_security_session_action_type { + RTE_SECURITY_ACTION_TYPE_NONE, + /**< No security actions */ + RTE_SECURITY_ACTION_TYPE_INLINE_CRYPTO, + /**< Crypto processing for security protocol is processed inline + * during transmission */ + RTE_SECURITY_ACTION_TYPE_INLINE_PROTOCOL, + /**< All security protocol processing is performed inline during + * transmission */ + RTE_SECURITY_ACTION_TYPE_LOOKASIDE_PROTOCOL + /**< All security protocol processing including crypto is performed + * on a lookaside accelerator */ + }; + +The ``rte_security_session_protocol`` is defined as + +.. code-block:: c + + enum rte_security_session_protocol { + RTE_SECURITY_PROTOCOL_IPSEC, + /**< IPsec Protocol */ + RTE_SECURITY_PROTOCOL_MACSEC, + /**< MACSec Protocol */ + }; + +Currently the library defines configuration parameters for IPSec only. For other +protocols like MACSec, structures and enums are defined as place holders which +will be updated in the future. + +IPsec related configuration parameters are defined in ``rte_security_ipsec_xform`` + +.. code-block:: c + + struct rte_security_ipsec_xform { + uint32_t spi; + /**< SA security parameter index */ + uint32_t salt; + /**< SA salt */ + struct rte_security_ipsec_sa_options options; + /**< various SA options */ + enum rte_security_ipsec_sa_direction direction; + /**< IPSec SA Direction - Egress/Ingress */ + enum rte_security_ipsec_sa_protocol proto; + /**< IPsec SA Protocol - AH/ESP */ + enum rte_security_ipsec_sa_mode mode; + /**< IPsec SA Mode - transport/tunnel */ + struct rte_security_ipsec_tunnel_param tunnel; + /**< Tunnel parameters, NULL for transport mode */ + }; + + +Security API +~~~~~~~~~~~~ + +The rte_security Library API is described in the *DPDK API Reference* document. + +Flow based Security Session +~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +In the case of NIC based offloads, the security session specified in the +'rte_flow_action_security' must be created on the same port as the +flow action that is being specified. + +The ingress/egress flow attribute should match that specified in the security +session if the security session supports the definition of the direction. + +Multiple flows can be configured to use the same security session. For +example if the security session specifies an egress IPsec SA, then multiple +flows can be specified to that SA. In the case of an ingress IPsec SA then +it is only valid to have a single flow to map to that security session. + +.. code-block:: console + + Configuration Path + | + +--------|--------+ + | Add/Remove | + | IPsec SA | <------ Build security flow action of + | | | ipsec transform + |--------|--------| + | + +--------V--------+ + | Flow API | + +--------|--------+ + | + +--------V--------+ + | | + | NIC PMD | <------ Add/Remove SA to/from hw context + | | + +--------|--------+ + | + +--------|--------+ + | HW ACCELERATED | + | NIC | + | | + +--------|--------+ + +* Add/Delete SA flow: + To add a new inline SA construct a rte_flow_item for Ethernet + IP + ESP + using the SA selectors and the ``rte_crypto_ipsec_xform`` as the ``rte_flow_action``. + Note that any rte_flow_items may be empty, which means it is not checked. + +.. code-block:: console + + In its most basic form, IPsec flow specification is as follows: + +-------+ +----------+ +--------+ +-----+ + | Eth | -> | IP4/6 | -> | ESP | -> | END | + +-------+ +----------+ +--------+ +-----+ + + However, the API can represent, IPsec crypto offload with any encapsulation: + +-------+ +--------+ +-----+ + | Eth | -> ... -> | ESP | -> | END | + +-------+ +--------+ +-----+ diff --git a/doc/guides/prog_guide/source_org.rst b/doc/guides/prog_guide/source_org.rst index d5d01f38..7aab4b45 100644 --- a/doc/guides/prog_guide/source_org.rst +++ b/doc/guides/prog_guide/source_org.rst @@ -108,7 +108,6 @@ The drivers directory has a *net* subdirectory which contains:: +-- szedata2 # SZEDATA2 poll mode driver +-- virtio # Virtio poll mode driver +-- vmxnet3 # VMXNET3 poll mode driver - +-- xenvirt # Xen virtio poll mode driver .. note:: diff --git a/doc/guides/prog_guide/traffic_metering_and_policing.rst b/doc/guides/prog_guide/traffic_metering_and_policing.rst new file mode 100644 index 00000000..89f0e68b --- /dev/null +++ b/doc/guides/prog_guide/traffic_metering_and_policing.rst @@ -0,0 +1,102 @@ +.. BSD LICENSE + Copyright(c) 2017 Intel Corporation. All rights reserved. + All rights reserved. + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions + are met: + + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in + the documentation and/or other materials provided with the + distribution. + * Neither the name of Intel Corporation nor the names of its + contributors may be used to endorse or promote products derived + from this software without specific prior written permission. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + + +Traffic Metering and Policing API +================================= + + +Overview +-------- + +This is the generic API for the Quality of Service (QoS) Traffic Metering and +Policing (MTR) of Ethernet devices. This API is agnostic of the underlying HW, +SW or mixed HW-SW implementation. + +The main features are: + +* Part of DPDK rte_ethdev API +* Capability query API +* Metering algorithms: RFC 2697 Single Rate Three Color Marker (srTCM), RFC 2698 + and RFC 4115 Two Rate Three Color Marker (trTCM) +* Policer actions (per meter output color): recolor, drop +* Statistics (per policer output color) + +Configuration steps +------------------- + +The metering and policing stage typically sits on top of flow classification, +which is why the MTR objects are enabled through a special "meter" action. + +The MTR objects are created and updated in their own name space (``rte_mtr``) +within the ``librte_ether`` library. Whether an MTR object is private to a +flow or potentially shared by several flows has to be specified at its +creation time. + +Once successfully created, an MTR object is hooked into the RX processing path +of the Ethernet device by linking it to one or several flows through the +dedicated "meter" flow action. One or several "meter" actions can be registered +for the same flow. An MTR object can only be destroyed if there are no flows +using it. + +Run-time processing +------------------- + +Traffic metering determines the color for the current packet (green, yellow, +red) based on the previous history for this flow as maintained by the MTR +object. The policer can do nothing, override the color the packet or drop the +packet. Statistics counters are maintained for MTR object, as configured. + +The processing done for each input packet hitting an MTR object is: + +* Traffic metering: The packet is assigned a color (the meter output color) + based on the previous traffic history reflected in the current state of the + MTR object, according to the specific traffic metering algorithm. The + traffic metering algorithm can typically work in color aware mode, in which + case the input packet already has an initial color (the input color), or in + color blind mode, which is equivalent to considering all input packets + initially colored as green. + +* Policing: There is a separate policer action configured for each meter + output color, which can: + + * Drop the packet. + + * Keep the same packet color: the policer output color matches the meter + output color (essentially a no-op action). + + * Recolor the packet: the policer output color is set to a different color + than the meter output color. The policer output color is the output color + of the packet, which is set in the packet meta-data (i.e. struct + ``rte_mbuf::sched::color``). + +* Statistics: The set of counters maintained for each MTR object is + configurable and subject to the implementation support. This set includes + the number of packets and bytes dropped or passed for each output color. diff --git a/doc/guides/prog_guide/vhost_lib.rst b/doc/guides/prog_guide/vhost_lib.rst index 59792907..e71bdbd5 100644 --- a/doc/guides/prog_guide/vhost_lib.rst +++ b/doc/guides/prog_guide/vhost_lib.rst @@ -110,6 +110,20 @@ The following is an overview of some key Vhost API functions: of those segments, thus the fewer the segments, the quicker we will get the mapping. NOTE: we may speed it by using tree searching in future. + - ``RTE_VHOST_USER_IOMMU_SUPPORT`` + + IOMMU support will be enabled when this flag is set. It is disabled by + default. + + Enabling this flag makes possible to use guest vIOMMU to protect vhost + from accessing memory the virtio device isn't allowed to, when the feature + is negotiated and an IOMMU device is declared. + + However, this feature enables vhost-user's reply-ack protocol feature, + which implementation is buggy in Qemu v2.7.0-v2.9.0 when doing multiqueue. + Enabling this flag with these Qemu version results in Qemu being blocked + when multiple queue pairs are declared. + * ``rte_vhost_driver_set_features(path, features)`` This function sets the feature bits the vhost-user driver supports. The @@ -129,8 +143,7 @@ The following is an overview of some key Vhost API functions: * ``destroy_device(int vid)`` - This callback is invoked when a virtio device shuts down (or when the - vhost connection is broken). + This callback is invoked when a virtio device is paused or shut down. * ``vring_state_changed(int vid, uint16_t queue_id, int enable)`` @@ -143,6 +156,18 @@ The following is an overview of some key Vhost API functions: ``VHOST_F_LOG_ALL`` will be set/cleared at the start/end of live migration, respectively. + * ``new_connection(int vid)`` + + This callback is invoked on new vhost-user socket connection. If DPDK + acts as the server the device should not be deleted before + ``destroy_connection`` callback is received. + + * ``destroy_connection(int vid)`` + + This callback is invoked when vhost-user socket connection is closed. + It indicates that device with id ``vid`` is no longer in use and can be + safely deleted. + * ``rte_vhost_driver_disable/enable_features(path, features))`` This function disables/enables some features. For example, it can be used to diff --git a/doc/guides/prog_guide/writing_efficient_code.rst b/doc/guides/prog_guide/writing_efficient_code.rst index 8223acee..d7ac6778 100644 --- a/doc/guides/prog_guide/writing_efficient_code.rst +++ b/doc/guides/prog_guide/writing_efficient_code.rst @@ -105,6 +105,21 @@ meaning that if all memory access operations are done on the first channel only, By default, the :ref:`Mempool Library <Mempool_Library>` spreads the addresses of objects among memory channels. +Locking memory pages +~~~~~~~~~~~~~~~~~~~~ + +The underlying operating system is allowed to load/unload memory pages at its own discretion. +These page loads could impact the performance, as the process is on hold when the kernel fetches them. + +To avoid these you could pre-load, and lock them into memory with the ``mlockall()`` call. + +.. code-block:: c + + if (mlockall(MCL_CURRENT | MCL_FUTURE)) { + RTE_LOG(NOTICE, USER1, "mlockall() failed with error \"%s\"\n", + strerror(errno)); + } + Communication Between lcores ---------------------------- |
