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Diffstat (limited to 'lib/librte_kni/rte_kni.h')
| -rw-r--r-- | lib/librte_kni/rte_kni.h | 256 |
1 files changed, 256 insertions, 0 deletions
diff --git a/lib/librte_kni/rte_kni.h b/lib/librte_kni/rte_kni.h new file mode 100644 index 00000000..9899a170 --- /dev/null +++ b/lib/librte_kni/rte_kni.h @@ -0,0 +1,256 @@ +/*- + * BSD LICENSE + * + * Copyright(c) 2010-2014 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. + */ + +#ifndef _RTE_KNI_H_ +#define _RTE_KNI_H_ + +/** + * @file + * RTE KNI + * + * The KNI library provides the ability to create and destroy kernel NIC + * interfaces that may be used by the RTE application to receive/transmit + * packets from/to Linux kernel net interfaces. + * + * This library provide two APIs to burst receive packets from KNI interfaces, + * and burst transmit packets to KNI interfaces. + */ + +#include <rte_pci.h> +#include <rte_memory.h> +#include <rte_mempool.h> + +#include <exec-env/rte_kni_common.h> + +#ifdef __cplusplus +extern "C" { +#endif + +struct rte_kni; +struct rte_mbuf; + +/** + * Structure which has the function pointers for KNI interface. + */ +struct rte_kni_ops { + uint8_t port_id; /* Port ID */ + + /* Pointer to function of changing MTU */ + int (*change_mtu)(uint8_t port_id, unsigned new_mtu); + + /* Pointer to function of configuring network interface */ + int (*config_network_if)(uint8_t port_id, uint8_t if_up); +}; + +/** + * Structure for configuring KNI device. + */ +struct rte_kni_conf { + /* + * KNI name which will be used in relevant network device. + * Let the name as short as possible, as it will be part of + * memzone name. + */ + char name[RTE_KNI_NAMESIZE]; + uint32_t core_id; /* Core ID to bind kernel thread on */ + uint16_t group_id; /* Group ID */ + unsigned mbuf_size; /* mbuf size */ + struct rte_pci_addr addr; + struct rte_pci_id id; + + uint8_t force_bind : 1; /* Flag to bind kernel thread */ +}; + +/** + * Initialize and preallocate KNI subsystem + * + * This function is to be executed on the MASTER lcore only, after EAL + * initialization and before any KNI interface is attempted to be + * allocated + * + * @param max_kni_ifaces + * The maximum number of KNI interfaces that can coexist concurrently + */ +void rte_kni_init(unsigned int max_kni_ifaces); + + +/** + * Allocate KNI interface according to the port id, mbuf size, mbuf pool, + * configurations and callbacks for kernel requests.The KNI interface created + * in the kernel space is the net interface the traditional Linux application + * talking to. + * + * The rte_kni_alloc shall not be called before rte_kni_init() has been + * called. rte_kni_alloc is thread safe. + * + * @param pktmbuf_pool + * The mempool for allocting mbufs for packets. + * @param conf + * The pointer to the configurations of the KNI device. + * @param ops + * The pointer to the callbacks for the KNI kernel requests. + * + * @return + * - The pointer to the context of a KNI interface. + * - NULL indicate error. + */ +struct rte_kni *rte_kni_alloc(struct rte_mempool *pktmbuf_pool, + const struct rte_kni_conf *conf, struct rte_kni_ops *ops); + +/** + * Release KNI interface according to the context. It will also release the + * paired KNI interface in kernel space. All processing on the specific KNI + * context need to be stopped before calling this interface. + * + * rte_kni_release is thread safe. + * + * @param kni + * The pointer to the context of an existent KNI interface. + * + * @return + * - 0 indicates success. + * - negative value indicates failure. + */ +int rte_kni_release(struct rte_kni *kni); + +/** + * It is used to handle the request mbufs sent from kernel space. + * Then analyzes it and calls the specific actions for the specific requests. + * Finally constructs the response mbuf and puts it back to the resp_q. + * + * @param kni + * The pointer to the context of an existent KNI interface. + * + * @return + * - 0 + * - negative value indicates failure. + */ +int rte_kni_handle_request(struct rte_kni *kni); + +/** + * Retrieve a burst of packets from a KNI interface. The retrieved packets are + * stored in rte_mbuf structures whose pointers are supplied in the array of + * mbufs, and the maximum number is indicated by num. It handles the freeing of + * the mbufs in the free queue of KNI interface. + * + * @param kni + * The KNI interface context. + * @param mbufs + * The array to store the pointers of mbufs. + * @param num + * The maximum number per burst. + * + * @return + * The actual number of packets retrieved. + */ +unsigned rte_kni_rx_burst(struct rte_kni *kni, struct rte_mbuf **mbufs, + unsigned num); + +/** + * Send a burst of packets to a KNI interface. The packets to be sent out are + * stored in rte_mbuf structures whose pointers are supplied in the array of + * mbufs, and the maximum number is indicated by num. It handles allocating + * the mbufs for KNI interface alloc queue. + * + * @param kni + * The KNI interface context. + * @param mbufs + * The array to store the pointers of mbufs. + * @param num + * The maximum number per burst. + * + * @return + * The actual number of packets sent. + */ +unsigned rte_kni_tx_burst(struct rte_kni *kni, struct rte_mbuf **mbufs, + unsigned num); + +/** + * Get the KNI context of its name. + * + * @param name + * pointer to the KNI device name. + * + * @return + * On success: Pointer to KNI interface. + * On failure: NULL. + */ +struct rte_kni *rte_kni_get(const char *name); + +/** + * Get the name given to a KNI device + * + * @param kni + * The KNI instance to query + * @return + * The pointer to the KNI name + */ +const char *rte_kni_get_name(const struct rte_kni *kni); + +/** + * Register KNI request handling for a specified port,and it can + * be called by master process or slave process. + * + * @param kni + * pointer to struct rte_kni. + * @param ops + * ponter to struct rte_kni_ops. + * + * @return + * On success: 0 + * On failure: -1 + */ +int rte_kni_register_handlers(struct rte_kni *kni, struct rte_kni_ops *ops); + +/** + * Unregister KNI request handling for a specified port. + * + * @param kni + * pointer to struct rte_kni. + * + * @return + * On success: 0 + * On failure: -1 + */ +int rte_kni_unregister_handlers(struct rte_kni *kni); + +/** + * Close KNI device. + */ +void rte_kni_close(void); + +#ifdef __cplusplus +} +#endif + +#endif /* _RTE_KNI_H_ */ |