linux/drivers/infiniband/hw/cxgb4/cq.c

/*
 * Copyright (c) 2009-2010 Chelsio, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     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.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <rdma/uverbs_ioctl.h>

#include "iw_cxgb4.h"

static void destroy_cq(struct c4iw_rdev *rdev, struct t4_cq *cq,
		       struct c4iw_dev_ucontext *uctx, struct sk_buff *skb,
		       struct c4iw_wr_wait *wr_waitp)
{ … }

static int create_cq(struct c4iw_rdev *rdev, struct t4_cq *cq,
		     struct c4iw_dev_ucontext *uctx,
		     struct c4iw_wr_wait *wr_waitp)
{ … }

static void insert_recv_cqe(struct t4_wq *wq, struct t4_cq *cq, u32 srqidx)
{ … }

int c4iw_flush_rq(struct t4_wq *wq, struct t4_cq *cq, int count)
{ … }

static void insert_sq_cqe(struct t4_wq *wq, struct t4_cq *cq,
			  struct t4_swsqe *swcqe)
{ … }

static void advance_oldest_read(struct t4_wq *wq);

int c4iw_flush_sq(struct c4iw_qp *qhp)
{ … }

static void flush_completed_wrs(struct t4_wq *wq, struct t4_cq *cq)
{ … }

static void create_read_req_cqe(struct t4_wq *wq, struct t4_cqe *hw_cqe,
		struct t4_cqe *read_cqe)
{ … }

static void advance_oldest_read(struct t4_wq *wq)
{ … }

/*
 * Move all CQEs from the HWCQ into the SWCQ.
 * Deal with out-of-order and/or completions that complete
 * prior unsignalled WRs.
 */
void c4iw_flush_hw_cq(struct c4iw_cq *chp, struct c4iw_qp *flush_qhp)
{ … }

static int cqe_completes_wr(struct t4_cqe *cqe, struct t4_wq *wq)
{ … }

void c4iw_count_rcqes(struct t4_cq *cq, struct t4_wq *wq, int *count)
{ … }

static void post_pending_srq_wrs(struct t4_srq *srq)
{ … }

static u64 reap_srq_cqe(struct t4_cqe *hw_cqe, struct t4_srq *srq)
{ … }

/*
 * poll_cq
 *
 * Caller must:
 *     check the validity of the first CQE,
 *     supply the wq assicated with the qpid.
 *
 * credit: cq credit to return to sge.
 * cqe_flushed: 1 iff the CQE is flushed.
 * cqe: copy of the polled CQE.
 *
 * return value:
 *    0		    CQE returned ok.
 *    -EAGAIN       CQE skipped, try again.
 *    -EOVERFLOW    CQ overflow detected.
 */
static int poll_cq(struct t4_wq *wq, struct t4_cq *cq, struct t4_cqe *cqe,
		   u8 *cqe_flushed, u64 *cookie, u32 *credit,
		   struct t4_srq *srq)
{ … }

static int __c4iw_poll_cq_one(struct c4iw_cq *chp, struct c4iw_qp *qhp,
			      struct ib_wc *wc, struct c4iw_srq *srq)
{ … }

/*
 * Get one cq entry from c4iw and map it to openib.
 *
 * Returns:
 *	0			cqe returned
 *	-ENODATA		EMPTY;
 *	-EAGAIN			caller must try again
 *	any other -errno	fatal error
 */
static int c4iw_poll_cq_one(struct c4iw_cq *chp, struct ib_wc *wc)
{ … }

int c4iw_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *wc)
{ … }

void c4iw_cq_rem_ref(struct c4iw_cq *chp)
{ … }

int c4iw_destroy_cq(struct ib_cq *ib_cq, struct ib_udata *udata)
{ … }

int c4iw_create_cq(struct ib_cq *ibcq, const struct ib_cq_init_attr *attr,
		   struct uverbs_attr_bundle *attrs)
{ … }

int c4iw_arm_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags flags)
{ … }

void c4iw_flush_srqidx(struct c4iw_qp *qhp, u32 srqidx)
{ … }