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Commit 15cdc644 authored by Tom Tucker's avatar Tom Tucker Committed by Trond Myklebust
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rpcrdma: Fix SQ size calculation when memreg is FRMR 



This patch updates the computation to include the worst case situation
where three FRMR are required to map a single RPC REQ.

Signed-off-by: default avatarTom Tucker <tom@ogc.us>
Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
parent 7a8b80eb

net/sunrpc/xprtrdma/rpc_rdma.c

+2 −0
Original line number Diff line number Diff line
@@ -249,6 +249,8 @@ rpcrdma_create_chunks(struct rpc_rqst *rqst, struct xdr_buf *target, 
	req->rl_nchunks = nchunks;



	BUG_ON(nchunks == 0);

	BUG_ON((r_xprt->rx_ia.ri_memreg_strategy == RPCRDMA_FRMR)

	       && (nchunks > 3));



	/*

	 * finish off header. If write, marshal discrim and nchunks.

net/sunrpc/xprtrdma/verbs.c

+16 −4
Original line number Diff line number Diff line
@@ -650,10 +650,22 @@ rpcrdma_ep_create(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia, 
	ep->rep_attr.cap.max_send_wr = cdata->max_requests;

	switch (ia->ri_memreg_strategy) {

	case RPCRDMA_FRMR:

		/* Add room for frmr register and invalidate WRs */

		ep->rep_attr.cap.max_send_wr *= 3;

		if (ep->rep_attr.cap.max_send_wr > devattr.max_qp_wr)

		/* Add room for frmr register and invalidate WRs.

		 * 1. FRMR reg WR for head

		 * 2. FRMR invalidate WR for head

		 * 3. FRMR reg WR for pagelist

		 * 4. FRMR invalidate WR for pagelist

		 * 5. FRMR reg WR for tail

		 * 6. FRMR invalidate WR for tail

		 * 7. The RDMA_SEND WR

		 */

		ep->rep_attr.cap.max_send_wr *= 7;

		if (ep->rep_attr.cap.max_send_wr > devattr.max_qp_wr) {

			cdata->max_requests = devattr.max_qp_wr / 7;

			if (!cdata->max_requests)

				return -EINVAL;

			ep->rep_attr.cap.max_send_wr = cdata->max_requests * 7;

		}

		break;

	case RPCRDMA_MEMWINDOWS_ASYNC:

	case RPCRDMA_MEMWINDOWS: