213 lines
6.2 KiB
C
213 lines
6.2 KiB
C
/*-
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* BSD LICENSE
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*
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* Copyright(c) 2010-2013 Intel Corporation. All rights reserved.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifndef _RTE_KNI_H_
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#define _RTE_KNI_H_
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/**
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* @file
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* RTE KNI
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*
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* The KNI library provides the ability to create and destroy kernel NIC
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* interfaces that may be used by the RTE application to receive/transmit
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* packets from/to Linux kernel net interfaces.
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*
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* This library provide two APIs to burst receive packets from KNI interfaces,
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* and burst transmit packets to KNI interfaces.
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*/
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#include <rte_mbuf.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct rte_kni;
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/**
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* Structure which has the function pointers for KNI interface.
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*/
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struct rte_kni_ops {
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/* Pointer to function of changing MTU */
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int (*change_mtu)(uint8_t port_id, unsigned new_mtu);
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/* Pointer to function of configuring network interface */
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int (*config_network_if)(uint8_t port_id, uint8_t if_up);
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};
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/**
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* Create kni interface according to the port id. It will create a paired KNI
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* interface in the kernel space for each NIC port. The KNI interface created
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* in the kernel space is the net interface the traditional Linux application
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* talking to.
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*
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* @param port_id
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* The port id.
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* @param pktmbuf_pool
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* The mempool for allocting mbufs for packets.
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* @param mbuf_size
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* The mbuf size to store a packet.
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*
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* @return
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* - The pointer to the context of a kni interface.
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* - NULL indicate error.
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*/
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extern struct rte_kni *rte_kni_create(uint8_t port_id, unsigned mbuf_size,
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struct rte_mempool *pktmbuf_pool, struct rte_kni_ops *ops);
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/**
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* Release kni interface according to the context. It will also release the
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* paired KNI interface in kernel space. All processing on the specific kni
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* context need to be stopped before calling this interface.
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*
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* @param kni
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* The pointer to the context of an existant kni interface.
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*
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* @return
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* - 0 indicates success.
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* - negative value indicates failure.
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*/
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extern int rte_kni_release(struct rte_kni *kni);
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/**
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* It is used to handle the request mbufs sent from kernel space.
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* Then analyzes it and calls the specific actions for the specific requests.
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* Finally constructs the response mbuf and puts it back to the resp_q.
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*
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* @param kni
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* The pointer to the context of an existant kni interface.
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*
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* @return
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* - 0
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* - negative value indicates failure.
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*/
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extern int rte_kni_handle_request(struct rte_kni *kni);
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/**
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* Retrieve a burst of packets from a kni interface. The retrieved packets are
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* stored in rte_mbuf structures whose pointers are supplied in the array of
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* mbufs, and the maximum number is indicated by num. It handles the freeing of
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* the mbufs in the free queue of kni interface.
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*
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* @param kni
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* The kni interface context.
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* @param mbufs
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* The array to store the pointers of mbufs.
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* @param num
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* The maximum number per burst.
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*
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* @return
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* The actual number of packets retrieved.
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*/
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extern unsigned rte_kni_rx_burst(struct rte_kni *kni,
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struct rte_mbuf **mbufs, unsigned num);
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/**
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* Send a burst of packets to a kni interface. The packets to be sent out are
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* stored in rte_mbuf structures whose pointers are supplied in the array of
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* mbufs, and the maximum number is indicated by num. It handles allocating
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* the mbufs for kni interface alloc queue.
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*
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* @param kni
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* The kni interface context.
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* @param mbufs
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* The array to store the pointers of mbufs.
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* @param num
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* The maximum number per burst.
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*
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* @return
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* The actual number of packets sent.
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*/
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extern unsigned rte_kni_tx_burst(struct rte_kni *kni,
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struct rte_mbuf **mbufs, unsigned num);
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/**
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* Get the port id from kni interface.
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*
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* @param kni
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* The kni interface context.
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*
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* @return
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* On success: The port id.
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* On failure: ~0x0
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*/
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extern uint8_t rte_kni_get_port_id(struct rte_kni *kni);
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/**
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* Get kni context information of the port.
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*
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* @port_id
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* the port id.
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*
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* @return
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* On success: Pointer to kni interface.
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* On failure: NULL
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*/
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extern struct rte_kni * rte_kni_info_get(uint8_t port_id);
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/**
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* Register kni request handling for a specified port,and it can
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* be called by master process or slave process.
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*
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* @param kni
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* pointer to struct rte_kni.
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* @param ops
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* ponter to struct rte_kni_ops.
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*
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* @return
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* On success: 0
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* On failure: -1
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*/
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extern int rte_kni_register_handlers(struct rte_kni *kni,
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struct rte_kni_ops *ops);
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/**
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* Unregister kni request handling for a specified port.
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*
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* @param kni
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* pointer to struct rte_kni.
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*
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* @return
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* On success: 0
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* On failure: -1
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*/
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extern int rte_kni_unregister_handlers(struct rte_kni *kni);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _RTE_KNI_H_ */
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