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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>
This commit is contained in:
Chuck Lever 2016-03-01 13:05:54 -05:00 committed by J. Bruce Fields
parent cf570a9374
commit f6763c29ab
3 changed files with 19 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/linux/sunrpc/svc_rdma.h
View File

@ -224,7 +224,7 @@ extern int rdma_read_chunk_frmr(struct svcxprt_rdma *, struct svc_rqst *,
/* svc_rdma_sendto.c */
extern int svc_rdma_map_xdr(struct svcxprt_rdma *, struct xdr_buf *,
struct svc_rdma_req_map *);
struct svc_rdma_req_map *, bool);
extern int svc_rdma_sendto(struct svc_rqst *);
extern struct rpcrdma_read_chunk *
svc_rdma_get_read_chunk(struct rpcrdma_msg *);

2
net/sunrpc/xprtrdma/svc_rdma_backchannel.c
View File

@ -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;

22
net/sunrpc/xprtrdma/svc_rdma_sendto.c
View File

@ -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;