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| author | Chuck Lever <chuck.lever@oracle.com> | 2015-01-13 11:03:11 -0500 |
|---|---|---|
| committer | J. Bruce Fields <bfields@redhat.com> | 2015-01-15 15:01:45 -0500 |
| commit | e5523bd28101869c85856247fc120faaf72bd232 (patch) | |
| tree | e7a485eb027f66d2a17c67b53fd7dd50a77a4e36 /net | |
| parent | 3fe04ee9f91084e7e6e999b09b8b15bcf97375e8 (diff) | |
| download | linux-e5523bd28101869c85856247fc120faaf72bd232.tar.gz linux-e5523bd28101869c85856247fc120faaf72bd232.tar.bz2 linux-e5523bd28101869c85856247fc120faaf72bd232.zip | |
svcrdma: Find rmsgp more reliably
xdr_start() can return the wrong rmsgp address if an assumption
about how the xdr_buf was constructed changes. When it gets it
wrong, the client receives a reply that has gibberish in the
RPC/RDMA header, preventing it from matching a waiting RPC request.
Instead, make (and document) just one assumption: that the RDMA
header for the client's RPC call is at the start of the first page
in rq_pages.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'net')
| -rw-r--r-- | net/sunrpc/xprtrdma/svc_rdma_sendto.c | 18 |
1 files changed, 4 insertions, 14 deletions
diff --git a/net/sunrpc/xprtrdma/svc_rdma_sendto.c b/net/sunrpc/xprtrdma/svc_rdma_sendto.c index 7d79897959a4..7de33d1af9b6 100644 --- a/net/sunrpc/xprtrdma/svc_rdma_sendto.c +++ b/net/sunrpc/xprtrdma/svc_rdma_sendto.c @@ -483,18 +483,6 @@ void svc_rdma_prep_reply_hdr(struct svc_rqst *rqstp) { } -/* - * Return the start of an xdr buffer. - */ -static void *xdr_start(struct xdr_buf *xdr) -{ - return xdr->head[0].iov_base - - (xdr->len - - xdr->page_len - - xdr->tail[0].iov_len - - xdr->head[0].iov_len); -} - int svc_rdma_sendto(struct svc_rqst *rqstp) { struct svc_xprt *xprt = rqstp->rq_xprt; @@ -512,8 +500,10 @@ int svc_rdma_sendto(struct svc_rqst *rqstp) dprintk("svcrdma: sending response for rqstp=%p\n", rqstp); - /* Get the RDMA request header. */ - rdma_argp = xdr_start(&rqstp->rq_arg); + /* Get the RDMA request header. The receive logic always + * places this at the start of page 0. + */ + rdma_argp = page_address(rqstp->rq_pages[0]); /* Build an req vec for the XDR */ ctxt = svc_rdma_get_context(rdma); |