summaryrefslogtreecommitdiffstats
path: root/net/sunrpc
diff options
context:
space:
mode:
authorChuck Lever <chuck.lever@oracle.com>2015-08-03 13:04:26 -0400
committerAnna Schumaker <Anna.Schumaker@Netapp.com>2015-08-05 16:21:28 -0400
commit2fcc213a18644610c79edbb5e847d73c6c5d5ded (patch)
tree24d5f10a807a088046882981005be2ceb69739b2 /net/sunrpc
parent677eb17e94edfbbea3b7e628d8aa046930f102c3 (diff)
downloadlinux-2fcc213a18644610c79edbb5e847d73c6c5d5ded.tar.bz2
xprtrdma: Fix large NFS SYMLINK calls
Repair how rpcrdma_marshal_req() chooses which RDMA message type to use for large non-WRITE operations so that it picks RDMA_NOMSG in the correct situations, and sets up the marshaling logic to SEND only the RPC/RDMA header. Large NFSv2 SYMLINK requests now use RDMA_NOMSG calls. The Linux NFS server XDR decoder for NFSv2 SYMLINK does not handle having the pathname argument arrive in a separate buffer. The decoder could be fixed, but this is simpler and RDMA_NOMSG can be used in a variety of other situations. Ensure that the Linux client continues to use "RDMA_MSG + read list" when sending large NFSv3 SYMLINK requests, which is more efficient than using RDMA_NOMSG. Large NFSv4 CREATE(NF4LNK) requests are changed to use "RDMA_MSG + read list" just like NFSv3 (see Section 5 of RFC 5667). Before, these did not work at all. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Tested-by: Devesh Sharma <devesh.sharma@avagotech.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'net/sunrpc')
-rw-r--r--net/sunrpc/xprtrdma/rpc_rdma.c25
1 files changed, 16 insertions, 9 deletions
diff --git a/net/sunrpc/xprtrdma/rpc_rdma.c b/net/sunrpc/xprtrdma/rpc_rdma.c
index 1dd48f269986..272158623b00 100644
--- a/net/sunrpc/xprtrdma/rpc_rdma.c
+++ b/net/sunrpc/xprtrdma/rpc_rdma.c
@@ -475,21 +475,24 @@ rpcrdma_marshal_req(struct rpc_rqst *rqst)
*
* o If the total request is under the inline threshold, all ops
* are sent as inline.
- * o Large non-write ops are sent with the entire message as a
- * single read chunk (protocol 0-position special case).
* o Large write ops transmit data as read chunk(s), header as
* inline.
+ * o Large non-write ops are sent with the entire message as a
+ * single read chunk (protocol 0-position special case).
*
- * Note: the NFS code sending down multiple argument segments
- * implies the op is a write.
- * TBD check NFSv4 setacl
+ * This assumes that the upper layer does not present a request
+ * that both has a data payload, and whose non-data arguments
+ * by themselves are larger than the inline threshold.
*/
- if (rpcrdma_args_inline(rqst))
+ if (rpcrdma_args_inline(rqst)) {
rtype = rpcrdma_noch;
- else if (rqst->rq_snd_buf.page_len == 0)
- rtype = rpcrdma_areadch;
- else
+ } else if (rqst->rq_snd_buf.flags & XDRBUF_WRITE) {
rtype = rpcrdma_readch;
+ } else {
+ headerp->rm_type = htonl(RDMA_NOMSG);
+ rtype = rpcrdma_areadch;
+ rpclen = 0;
+ }
/* The following simplification is not true forever */
if (rtype != rpcrdma_noch && wtype == rpcrdma_replych)
@@ -546,6 +549,10 @@ rpcrdma_marshal_req(struct rpc_rqst *rqst)
req->rl_send_iov[0].length = hdrlen;
req->rl_send_iov[0].lkey = rdmab_lkey(req->rl_rdmabuf);
+ req->rl_niovs = 1;
+ if (rtype == rpcrdma_areadch)
+ return 0;
+
req->rl_send_iov[1].addr = rdmab_addr(req->rl_sendbuf);
req->rl_send_iov[1].length = rpclen;
req->rl_send_iov[1].lkey = rdmab_lkey(req->rl_sendbuf);