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rpcrdma: Fix SQ size calculation when memreg is FRMR

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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: Tom Tucker <tom@ogc.us>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Tom Tucker 2010-08-11 12:47:24 -04:00 committed by Trond Myklebust
parent 7a8b80eb38
commit 15cdc644b2
2 changed files with 18 additions and 4 deletions
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2
net/sunrpc/xprtrdma/rpc_rdma.c
View File

@ -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.

20
net/sunrpc/xprtrdma/verbs.c
View File

@ -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)
return -EINVAL;
/* 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: