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Commit 5b180a9a authored by Tom Tucker's avatar Tom Tucker
Browse files

svcrdma: Add support to svc_rdma_send to handle chained WR 



WR can be submitted as linked lists of WR. Update the svc_rdma_send
routine to handle WR chains. This will be used to submit a WR that
uses an FRMR with another WR that invalidates the FRMR.

Signed-off-by: default avatarTom Tucker <tom@opengridcomputing.com>
parent a5abf4e8

net/sunrpc/xprtrdma/svc_rdma_transport.c

+21 −8
Original line number Diff line number Diff line
@@ -1235,17 +1235,23 @@ int svc_rdma_fastreg(struct svcxprt_rdma *xprt, 


int svc_rdma_send(struct svcxprt_rdma *xprt, struct ib_send_wr *wr)

{

	struct ib_send_wr *bad_wr;

	struct ib_send_wr *bad_wr, *n_wr;

	int wr_count;

	int i;

	int ret;



	if (test_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags))

		return -ENOTCONN;



	BUG_ON(wr->send_flags != IB_SEND_SIGNALED);

	wr_count = 1;

	for (n_wr = wr->next; n_wr; n_wr = n_wr->next)

		wr_count++;



	/* If the SQ is full, wait until an SQ entry is available */

	while (1) {

		spin_lock_bh(&xprt->sc_lock);

		if (xprt->sc_sq_depth == atomic_read(&xprt->sc_sq_count)) {

		if (xprt->sc_sq_depth < atomic_read(&xprt->sc_sq_count) + wr_count) {

			spin_unlock_bh(&xprt->sc_lock);

			atomic_inc(&rdma_stat_sq_starve);
@@ -1260,12 +1266,17 @@ int svc_rdma_send(struct svcxprt_rdma *xprt, struct ib_send_wr *wr) 
				return 0;

			continue;

		}

		/* Bumped used SQ WR count and post */

		/* Take a transport ref for each WR posted */

		for (i = 0; i < wr_count; i++)

			svc_xprt_get(&xprt->sc_xprt);



		/* Bump used SQ WR count and post */

		atomic_add(wr_count, &xprt->sc_sq_count);

		ret = ib_post_send(xprt->sc_qp, wr, &bad_wr);

		if (!ret)

			atomic_inc(&xprt->sc_sq_count);

		else {

		if (ret) {

			set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);

			atomic_sub(wr_count, &xprt->sc_sq_count);

			for (i = 0; i < wr_count; i ++)

				svc_xprt_put(&xprt->sc_xprt);

			dprintk("svcrdma: failed to post SQ WR rc=%d, "

			       "sc_sq_count=%d, sc_sq_depth=%d\n",
@@ -1273,6 +1284,8 @@ int svc_rdma_send(struct svcxprt_rdma *xprt, struct ib_send_wr *wr) 
			       xprt->sc_sq_depth);

		}

		spin_unlock_bh(&xprt->sc_lock);

		if (ret)

			wake_up(&xprt->sc_send_wait);

		break;

	}

	return ret;