From c421ece68f6952d4cc48ee81ebfc61ef0b83ad3b Mon Sep 17 00:00:00 2001 From: Chuck Lever Date: Mon, 1 Oct 2018 14:25:20 -0400 Subject: [PATCH] xprtrdma: Create more MRs at a time Some devices require more than 3 MRs to build a single 1MB I/O. Ensure that rpcrdma_mrs_create() will add enough MRs to build that I/O. In a subsequent patch I'm changing the MR recovery logic to just toss out the MRs. In that case it's possible for ->send_request to loop acquiring some MRs, not getting enough, getting called again, recycling the previous MRs, then not getting enough, lather rinse repeat. Thus first we need to ensure enough MRs are created to prevent that loop. I'm "reusing" ia->ri_max_segs. All of its accessors seem to want the maximum number of data segments plus two, so I'm going to bake that into the initial calculation. Signed-off-by: Chuck Lever Signed-off-by: Anna Schumaker --- net/sunrpc/xprtrdma/fmr_ops.c | 1 + net/sunrpc/xprtrdma/frwr_ops.c | 1 + net/sunrpc/xprtrdma/rpc_rdma.c | 2 -- net/sunrpc/xprtrdma/verbs.c | 2 +- 4 files changed, 3 insertions(+), 3 deletions(-) diff --git a/net/sunrpc/xprtrdma/fmr_ops.c b/net/sunrpc/xprtrdma/fmr_ops.c index 0f7c465d9a5a..db589a23682b 100644 --- a/net/sunrpc/xprtrdma/fmr_ops.c +++ b/net/sunrpc/xprtrdma/fmr_ops.c @@ -187,6 +187,7 @@ fmr_op_open(struct rpcrdma_ia *ia, struct rpcrdma_ep *ep, ia->ri_max_segs = max_t(unsigned int, 1, RPCRDMA_MAX_DATA_SEGS / RPCRDMA_MAX_FMR_SGES); + ia->ri_max_segs += 2; /* segments for head and tail buffers */ return 0; } diff --git a/net/sunrpc/xprtrdma/frwr_ops.c b/net/sunrpc/xprtrdma/frwr_ops.c index 1bb00dd6ccdb..1cc4db515c85 100644 --- a/net/sunrpc/xprtrdma/frwr_ops.c +++ b/net/sunrpc/xprtrdma/frwr_ops.c @@ -276,6 +276,7 @@ frwr_op_open(struct rpcrdma_ia *ia, struct rpcrdma_ep *ep, ia->ri_max_segs = max_t(unsigned int, 1, RPCRDMA_MAX_DATA_SEGS / ia->ri_max_frwr_depth); + ia->ri_max_segs += 2; /* segments for head and tail buffers */ return 0; } diff --git a/net/sunrpc/xprtrdma/rpc_rdma.c b/net/sunrpc/xprtrdma/rpc_rdma.c index 293b3d3e3e65..15edc050ca93 100644 --- a/net/sunrpc/xprtrdma/rpc_rdma.c +++ b/net/sunrpc/xprtrdma/rpc_rdma.c @@ -71,7 +71,6 @@ static unsigned int rpcrdma_max_call_header_size(unsigned int maxsegs) size = RPCRDMA_HDRLEN_MIN; /* Maximum Read list size */ - maxsegs += 2; /* segment for head and tail buffers */ size = maxsegs * rpcrdma_readchunk_maxsz * sizeof(__be32); /* Minimal Read chunk size */ @@ -97,7 +96,6 @@ static unsigned int rpcrdma_max_reply_header_size(unsigned int maxsegs) size = RPCRDMA_HDRLEN_MIN; /* Maximum Write list size */ - maxsegs += 2; /* segment for head and tail buffers */ size = sizeof(__be32); /* segment count */ size += maxsegs * rpcrdma_segment_maxsz * sizeof(__be32); size += sizeof(__be32); /* list discriminator */ diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c index 956a5ea47b58..5625a5089f96 100644 --- a/net/sunrpc/xprtrdma/verbs.c +++ b/net/sunrpc/xprtrdma/verbs.c @@ -1019,7 +1019,7 @@ rpcrdma_mrs_create(struct rpcrdma_xprt *r_xprt) LIST_HEAD(free); LIST_HEAD(all); - for (count = 0; count < 3; count++) { + for (count = 0; count < ia->ri_max_segs; count++) { struct rpcrdma_mr *mr; int rc;