diff options
| author |   Chuck Lever <chuck.lever@oracle.com> | 2016-03-01 13:05:54 -0500 |
|---|---|---|
| committer |   J. Bruce Fields <bfields@redhat.com> | 2016-03-01 13:06:34 -0800 |
| commit | f6763c29ab86c3ee27760a06e07bbeab47635b61 (patch) | |
| tree | 34252ca2fcf9334f18cb2be875ecf340bb0502ba /net/sunrpc/xprtrdma | |
| parent | svcrdma: Do not write xdr_buf::tail in a Write chunk (diff) | |
| download | linux-dev-f6763c29ab86c3ee27760a06e07bbeab47635b61.tar.xz linux-dev-f6763c29ab86c3ee27760a06e07bbeab47635b61.zip | |
svcrdma: Do not send Write chunk XDR pad with inline content
The NFS server's XDR encoders adds an XDR pad for content in the
xdr_buf page list at the beginning of the xdr_buf's tail buffer.
On RDMA transports, Write chunks are sent separately and without an
XDR pad.
If a Write chunk is being sent, strip off the pad in the tail buffer
so that inline content following the Write chunk remains XDR-aligned
when it is sent to the client.
BugLink: https://bugzilla.linux-nfs.org/show_bug.cgi?id=294
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'net/sunrpc/xprtrdma')
| -rw-r--r-- | net/sunrpc/xprtrdma/svc_rdma_backchannel.c | 2 | ||||
| -rw-r--r-- | net/sunrpc/xprtrdma/svc_rdma_sendto.c | 22 |
2 files changed, 18 insertions, 6 deletions
diff --git a/net/sunrpc/xprtrdma/svc_rdma_backchannel.c b/net/sunrpc/xprtrdma/svc_rdma_backchannel.c index 65a7c232a345..de3919624fac 100644 --- a/net/sunrpc/xprtrdma/svc_rdma_backchannel.c +++ b/net/sunrpc/xprtrdma/svc_rdma_backchannel.c @@ -107,7 +107,7 @@ static int svc_rdma_bc_sendto(struct svcxprt_rdma *rdma, int ret; vec = svc_rdma_get_req_map(rdma); - ret = svc_rdma_map_xdr(rdma, sndbuf, vec); + ret = svc_rdma_map_xdr(rdma, sndbuf, vec, false); if (ret) goto out_err; diff --git a/net/sunrpc/xprtrdma/svc_rdma_sendto.c b/net/sunrpc/xprtrdma/svc_rdma_sendto.c index 86fea5c59125..a8fab9968891 100644 --- a/net/sunrpc/xprtrdma/svc_rdma_sendto.c +++ b/net/sunrpc/xprtrdma/svc_rdma_sendto.c @@ -57,7 +57,8 @@ static u32 xdr_padsize(u32 len) int svc_rdma_map_xdr(struct svcxprt_rdma *xprt, struct xdr_buf *xdr, - struct svc_rdma_req_map *vec) + struct svc_rdma_req_map *vec, + bool write_chunk_present) { int sge_no; u32 sge_bytes; @@ -97,9 +98,20 @@ int svc_rdma_map_xdr(struct svcxprt_rdma *xprt, /* Tail SGE */ if (xdr->tail[0].iov_len) { - vec->sge[sge_no].iov_base = xdr->tail[0].iov_base; - vec->sge[sge_no].iov_len = xdr->tail[0].iov_len; - sge_no++; + unsigned char *base = xdr->tail[0].iov_base; + size_t len = xdr->tail[0].iov_len; + u32 xdr_pad = xdr_padsize(xdr->page_len); + + if (write_chunk_present && xdr_pad) { + base += xdr_pad; + len -= xdr_pad; + } + + if (len) { + vec->sge[sge_no].iov_base = base; + vec->sge[sge_no].iov_len = len; + sge_no++; + } } dprintk("svcrdma: %s: sge_no %d page_no %d " @@ -594,7 +606,7 @@ int svc_rdma_sendto(struct svc_rqst *rqstp) ctxt = svc_rdma_get_context(rdma); ctxt->direction = DMA_TO_DEVICE; vec = svc_rdma_get_req_map(rdma); - ret = svc_rdma_map_xdr(rdma, &rqstp->rq_res, vec); + ret = svc_rdma_map_xdr(rdma, &rqstp->rq_res, vec, wr_ary != NULL); if (ret) goto err0; inline_bytes = rqstp->rq_res.len; |