diff options
Diffstat (limited to 'doc/guides/sample_app_ug/kernel_nic_interface.rst')
| -rw-r--r-- | doc/guides/sample_app_ug/kernel_nic_interface.rst | 363 |
1 files changed, 8 insertions, 355 deletions
diff --git a/doc/guides/sample_app_ug/kernel_nic_interface.rst b/doc/guides/sample_app_ug/kernel_nic_interface.rst index 580d06b5..1b3ee9a5 100644 --- a/doc/guides/sample_app_ug/kernel_nic_interface.rst +++ b/doc/guides/sample_app_ug/kernel_nic_interface.rst @@ -202,74 +202,8 @@ Setup of mbuf pool, driver and queues is similar to the setup done in the :doc:` In addition, one or more kernel NIC interfaces are allocated for each of the configured ports according to the command line parameters. -The code for allocating the kernel NIC interfaces for a specific port is as follows: - -.. code-block:: c - - static int - kni_alloc(uint16_t port_id) - { - uint8_t i; - struct rte_kni *kni; - struct rte_kni_conf conf; - struct kni_port_params **params = kni_port_params_array; - - if (port_id >= RTE_MAX_ETHPORTS || !params[port_id]) - return -1; - - params[port_id]->nb_kni = params[port_id]->nb_lcore_k ? params[port_id]->nb_lcore_k : 1; - - for (i = 0; i < params[port_id]->nb_kni; i++) { - - /* Clear conf at first */ - - memset(&conf, 0, sizeof(conf)); - if (params[port_id]->nb_lcore_k) { - snprintf(conf.name, RTE_KNI_NAMESIZE, "vEth%u_%u", port_id, i); - conf.core_id = params[port_id]->lcore_k[i]; - conf.force_bind = 1; - } else - snprintf(conf.name, RTE_KNI_NAMESIZE, "vEth%u", port_id); - conf.group_id = (uint16_t)port_id; - conf.mbuf_size = MAX_PACKET_SZ; - - /* - * The first KNI device associated to a port - * is the master, for multiple kernel thread - * environment. - */ - - if (i == 0) { - struct rte_kni_ops ops; - struct rte_eth_dev_info dev_info; - - memset(&dev_info, 0, sizeof(dev_info)); rte_eth_dev_info_get(port_id, &dev_info); - - conf.addr = dev_info.pci_dev->addr; - conf.id = dev_info.pci_dev->id; - - /* Get the interface default mac address */ - rte_eth_macaddr_get(port_id, (struct ether_addr *)&conf.mac_addr); - - memset(&ops, 0, sizeof(ops)); - - ops.port_id = port_id; - ops.change_mtu = kni_change_mtu; - ops.config_network_if = kni_config_network_interface; - ops.config_mac_address = kni_config_mac_address; - - kni = rte_kni_alloc(pktmbuf_pool, &conf, &ops); - } else - kni = rte_kni_alloc(pktmbuf_pool, &conf, NULL); - - if (!kni) - rte_exit(EXIT_FAILURE, "Fail to create kni for " - "port: %d\n", port_id); - - params[port_id]->kni[i] = kni; - } - return 0; - } +The code for allocating the kernel NIC interfaces for a specific port is +in the function ``kni_alloc``. The other step in the initialization process that is unique to this sample application is the association of each port with lcores for RX, TX and kernel threads. @@ -280,105 +214,8 @@ is the association of each port with lcores for RX, TX and kernel threads. * Other lcores for pinning the kernel threads on one by one -This is done by using the`kni_port_params_array[]` array, which is indexed by the port ID. -The code is as follows: - -.. code-block:: console - - static int - parse_config(const char *arg) - { - const char *p, *p0 = arg; - char s[256], *end; - unsigned size; - enum fieldnames { - FLD_PORT = 0, - FLD_LCORE_RX, - FLD_LCORE_TX, - _NUM_FLD = KNI_MAX_KTHREAD + 3, - }; - int i, j, nb_token; - char *str_fld[_NUM_FLD]; - unsigned long int_fld[_NUM_FLD]; - uint16_t port_id, nb_kni_port_params = 0; - - memset(&kni_port_params_array, 0, sizeof(kni_port_params_array)); - - while (((p = strchr(p0, '(')) != NULL) && nb_kni_port_params < RTE_MAX_ETHPORTS) { - p++; - if ((p0 = strchr(p, ')')) == NULL) - goto fail; - - size = p0 - p; - - if (size >= sizeof(s)) { - printf("Invalid config parameters\n"); - goto fail; - } - - snprintf(s, sizeof(s), "%.*s", size, p); - nb_token = rte_strsplit(s, sizeof(s), str_fld, _NUM_FLD, ','); - - if (nb_token <= FLD_LCORE_TX) { - printf("Invalid config parameters\n"); - goto fail; - } - - for (i = 0; i < nb_token; i++) { - errno = 0; - int_fld[i] = strtoul(str_fld[i], &end, 0); - if (errno != 0 || end == str_fld[i]) { - printf("Invalid config parameters\n"); - goto fail; - } - } - - i = 0; - port_id = (uint8_t)int_fld[i++]; - - if (port_id >= RTE_MAX_ETHPORTS) { - printf("Port ID %u could not exceed the maximum %u\n", port_id, RTE_MAX_ETHPORTS); - goto fail; - } - - if (kni_port_params_array[port_id]) { - printf("Port %u has been configured\n", port_id); - goto fail; - } - - kni_port_params_array[port_id] = (struct kni_port_params*)rte_zmalloc("KNI_port_params", sizeof(struct kni_port_params), RTE_CACHE_LINE_SIZE); - kni_port_params_array[port_id]->port_id = port_id; - kni_port_params_array[port_id]->lcore_rx = (uint8_t)int_fld[i++]; - kni_port_params_array[port_id]->lcore_tx = (uint8_t)int_fld[i++]; - - if (kni_port_params_array[port_id]->lcore_rx >= RTE_MAX_LCORE || kni_port_params_array[port_id]->lcore_tx >= RTE_MAX_LCORE) { - printf("lcore_rx %u or lcore_tx %u ID could not " - "exceed the maximum %u\n", - kni_port_params_array[port_id]->lcore_rx, kni_port_params_array[port_id]->lcore_tx, RTE_MAX_LCORE); - goto fail; - } - - for (j = 0; i < nb_token && j < KNI_MAX_KTHREAD; i++, j++) - kni_port_params_array[port_id]->lcore_k[j] = (uint8_t)int_fld[i]; - kni_port_params_array[port_id]->nb_lcore_k = j; - } - - print_config(); - - return 0; - - fail: - - for (i = 0; i < RTE_MAX_ETHPORTS; i++) { - if (kni_port_params_array[i]) { - rte_free(kni_port_params_array[i]); - kni_port_params_array[i] = NULL; - } - } - - return -1; - - } +This is done by using the ``kni_port_params_array[]`` array, which is indexed by the port ID. +The code is in the function ``parse_config``. Packet Forwarding ~~~~~~~~~~~~~~~~~ @@ -387,99 +224,18 @@ After the initialization steps are completed, the main_loop() function is run on This function first checks the lcore_id against the user provided lcore_rx and lcore_tx to see if this lcore is reading from or writing to kernel NIC interfaces. -For the case that reads from a NIC port and writes to the kernel NIC interfaces, +For the case that reads from a NIC port and writes to the kernel NIC interfaces (``kni_ingress``), the packet reception is the same as in L2 Forwarding sample application (see :ref:`l2_fwd_app_rx_tx_packets`). The packet transmission is done by sending mbufs into the kernel NIC interfaces by rte_kni_tx_burst(). The KNI library automatically frees the mbufs after the kernel successfully copied the mbufs. -.. code-block:: c - - /** - * Interface to burst rx and enqueue mbufs into rx_q - */ - - static void - kni_ingress(struct kni_port_params *p) - { - uint8_t i, nb_kni, port_id; - unsigned nb_rx, num; - struct rte_mbuf *pkts_burst[PKT_BURST_SZ]; - - if (p == NULL) - return; - - nb_kni = p->nb_kni; - port_id = p->port_id; - - for (i = 0; i < nb_kni; i++) { - /* Burst rx from eth */ - nb_rx = rte_eth_rx_burst(port_id, 0, pkts_burst, PKT_BURST_SZ); - if (unlikely(nb_rx > PKT_BURST_SZ)) { - RTE_LOG(ERR, APP, "Error receiving from eth\n"); - return; - } - - /* Burst tx to kni */ - num = rte_kni_tx_burst(p->kni[i], pkts_burst, nb_rx); - kni_stats[port_id].rx_packets += num; - rte_kni_handle_request(p->kni[i]); - - if (unlikely(num < nb_rx)) { - /* Free mbufs not tx to kni interface */ - kni_burst_free_mbufs(&pkts_burst[num], nb_rx - num); - kni_stats[port_id].rx_dropped += nb_rx - num; - } - } - } - -For the other case that reads from kernel NIC interfaces and writes to a physical NIC port, packets are retrieved by reading -mbufs from kernel NIC interfaces by `rte_kni_rx_burst()`. +For the other case that reads from kernel NIC interfaces +and writes to a physical NIC port (``kni_egress``), +packets are retrieved by reading mbufs from kernel NIC interfaces by ``rte_kni_rx_burst()``. The packet transmission is the same as in the L2 Forwarding sample application (see :ref:`l2_fwd_app_rx_tx_packets`). -.. code-block:: c - - /** - * Interface to dequeue mbufs from tx_q and burst tx - */ - - static void - - kni_egress(struct kni_port_params *p) - { - uint8_t i, nb_kni, port_id; - unsigned nb_tx, num; - struct rte_mbuf *pkts_burst[PKT_BURST_SZ]; - - if (p == NULL) - return; - - nb_kni = p->nb_kni; - port_id = p->port_id; - - for (i = 0; i < nb_kni; i++) { - /* Burst rx from kni */ - num = rte_kni_rx_burst(p->kni[i], pkts_burst, PKT_BURST_SZ); - if (unlikely(num > PKT_BURST_SZ)) { - RTE_LOG(ERR, APP, "Error receiving from KNI\n"); - return; - } - - /* Burst tx to eth */ - - nb_tx = rte_eth_tx_burst(port_id, 0, pkts_burst, (uint16_t)num); - - kni_stats[port_id].tx_packets += nb_tx; - - if (unlikely(nb_tx < num)) { - /* Free mbufs not tx to NIC */ - kni_burst_free_mbufs(&pkts_burst[nb_tx], num - nb_tx); - kni_stats[port_id].tx_dropped += num - nb_tx; - } - } - } - Callbacks for Kernel Requests ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ @@ -492,106 +248,3 @@ Application may choose to not implement following callbacks: - ``config_mac_address`` - ``config_promiscusity`` - - -.. code-block:: c - - static struct rte_kni_ops kni_ops = { - .change_mtu = kni_change_mtu, - .config_network_if = kni_config_network_interface, - .config_mac_address = kni_config_mac_address, - .config_promiscusity = kni_config_promiscusity, - }; - - /* Callback for request of changing MTU */ - - static int - kni_change_mtu(uint16_t port_id, unsigned new_mtu) - { - int ret; - struct rte_eth_conf conf; - - if (port_id >= rte_eth_dev_count()) { - RTE_LOG(ERR, APP, "Invalid port id %d\n", port_id); - return -EINVAL; - } - - RTE_LOG(INFO, APP, "Change MTU of port %d to %u\n", port_id, new_mtu); - - /* Stop specific port */ - - rte_eth_dev_stop(port_id); - - memcpy(&conf, &port_conf, sizeof(conf)); - - /* Set new MTU */ - - if (new_mtu > ETHER_MAX_LEN) - conf.rxmode.jumbo_frame = 1; - else - conf.rxmode.jumbo_frame = 0; - - /* mtu + length of header + length of FCS = max pkt length */ - - conf.rxmode.max_rx_pkt_len = new_mtu + KNI_ENET_HEADER_SIZE + KNI_ENET_FCS_SIZE; - - ret = rte_eth_dev_configure(port_id, 1, 1, &conf); - if (ret < 0) { - RTE_LOG(ERR, APP, "Fail to reconfigure port %d\n", port_id); - return ret; - } - - /* Restart specific port */ - - ret = rte_eth_dev_start(port_id); - if (ret < 0) { - RTE_LOG(ERR, APP, "Fail to restart port %d\n", port_id); - return ret; - } - - return 0; - } - - /* Callback for request of configuring network interface up/down */ - - static int - kni_config_network_interface(uint16_t port_id, uint8_t if_up) - { - int ret = 0; - - if (port_id >= rte_eth_dev_count() || port_id >= RTE_MAX_ETHPORTS) { - RTE_LOG(ERR, APP, "Invalid port id %d\n", port_id); - return -EINVAL; - } - - RTE_LOG(INFO, APP, "Configure network interface of %d %s\n", - - port_id, if_up ? "up" : "down"); - - if (if_up != 0) { - /* Configure network interface up */ - rte_eth_dev_stop(port_id); - ret = rte_eth_dev_start(port_id); - } else /* Configure network interface down */ - rte_eth_dev_stop(port_id); - - if (ret < 0) - RTE_LOG(ERR, APP, "Failed to start port %d\n", port_id); - return ret; - } - - /* Callback for request of configuring device mac address */ - - static int - kni_config_mac_address(uint16_t port_id, uint8_t mac_addr[]) - { - ..... - } - - /* Callback for request of configuring promiscuous mode */ - - static int - kni_config_promiscusity(uint16_t port_id, uint8_t to_on) - { - ..... - } |