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/*-
* BSD LICENSE
*
* Copyright (c) Intel Corporation. All rights reserved.
* Copyright (c) Mellanox Technologies LTD. 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 SPDK_RDMA_H
#define SPDK_RDMA_H
#include <infiniband/verbs.h>
#include <rdma/rdma_cma.h>
#include <rdma/rdma_verbs.h>
struct spdk_rdma_qp_init_attr {
void *qp_context;
struct ibv_cq *send_cq;
struct ibv_cq *recv_cq;
struct ibv_srq *srq;
struct ibv_qp_cap cap;
struct ibv_pd *pd;
};
struct spdk_rdma_send_wr_list {
struct ibv_send_wr *first;
struct ibv_send_wr *last;
};
struct spdk_rdma_qp {
struct ibv_qp *qp;
struct rdma_cm_id *cm_id;
struct spdk_rdma_send_wr_list send_wrs;
};
/**
* Create RDMA provider specific qpair
* \param cm_id Pointer to RDMACM cm_id
* \param qp_attr Pointer to qpair init attributes
* \return Pointer to a newly created qpair on success or NULL on failure
*/
struct spdk_rdma_qp *spdk_rdma_qp_create(struct rdma_cm_id *cm_id,
struct spdk_rdma_qp_init_attr *qp_attr);
/**
* Accept a connection request. Called by the passive side (NVMEoF target)
* \param spdk_rdma_qp Pointer to a qpair
* \param conn_param Optional information needed to establish the connection
* \return 0 on success, errno on failure
*/
int spdk_rdma_qp_accept(struct spdk_rdma_qp *spdk_rdma_qp, struct rdma_conn_param *conn_param);
/**
* Complete the connection process, must be called by the active
* side (NVMEoF initiator) upon receipt RDMA_CM_EVENT_CONNECT_RESPONSE
* \param spdk_rdma_qp Pointer to a qpair
* \return 0 on success, errno on failure
*/
int spdk_rdma_qp_complete_connect(struct spdk_rdma_qp *spdk_rdma_qp);
/**
* Destroy RDMA provider specific qpair
* \param spdk_rdma_qp Pointer to qpair to be destroyed
*/
void spdk_rdma_qp_destroy(struct spdk_rdma_qp *spdk_rdma_qp);
/**
* Disconnect a connection and transition assoiciated qpair to error state.
* Generates RDMA_CM_EVENT_DISCONNECTED on both connection sides
* \param spdk_rdma_qp Pointer to qpair to be destroyed
*/
int spdk_rdma_qp_disconnect(struct spdk_rdma_qp *spdk_rdma_qp);
/**
* Append the given send wr structure to the qpair's outstanding sends list.
* This function accepts either a single Work Request or the first WR in a linked list.
*
* \param spdk_rdma_qp Pointer to SPDK RDMA qpair
* \param first Pointer to the first Work Request
* \return true if there were no outstanding WRs before, false otherwise
*/
bool spdk_rdma_qp_queue_send_wrs(struct spdk_rdma_qp *spdk_rdma_qp, struct ibv_send_wr *first);
/**
* Submit all queued Work Request
* \param spdk_rdma_qp Pointer to SPDK RDMA qpair
* \param bad_wr Stores a pointer to the first failed WR if this function return nonzero value
* \return 0 on succes, errno on failure
*/
int spdk_rdma_qp_flush_send_wrs(struct spdk_rdma_qp *spdk_rdma_qp, struct ibv_send_wr **bad_wr);
#endif /* SPDK_RDMA_H */
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