On Tue, 25 Mar 2014 09:50:45 -0500
Steve Wise <swise@xxxxxxxxxxxxxxxxxxxxx> wrote:
> From: Tom Tucker <tom@xxxxxx>
>
> A few changes regressed the client and server transports for NFSRDMA.
>
> The server regression was caused by the addition of rq_next_page
> (afc59400d6c65bad66d4ad0b2daf879cbff8e23e). There were a few places that
> were missed with the update of the rq_respages array.
>
> The client regression was due to additional XDR sanity checking
> (64bd577ea0021f5903505de061b3b7d8a785ee94) that exposed a latent bug in
> the NFSRDMA client. The bug is that if there were inline data, then the
> rpcrdma_fixup_inline function would would incorrectly set the XDR page_len
> to zero. Since the decode_read3resok logic previously computed this
> value from the reported len - header len, the bug was not symptomatic.
>
> Signed-off-by: Tom Tucker <tom@xxxxxx>
> Tested-by: Steve Wise <swise@xxxxxx>
> ---
>
> net/sunrpc/xprtrdma/rpc_rdma.c | 3 +--
> net/sunrpc/xprtrdma/svc_rdma_recvfrom.c | 12 ++++--------
> net/sunrpc/xprtrdma/svc_rdma_sendto.c | 1 +
> 3 files changed, 6 insertions(+), 10 deletions(-)
>
> diff --git a/net/sunrpc/xprtrdma/rpc_rdma.c b/net/sunrpc/xprtrdma/rpc_rdma.c
> index e03725b..e811c40 100644
> --- a/net/sunrpc/xprtrdma/rpc_rdma.c
> +++ b/net/sunrpc/xprtrdma/rpc_rdma.c
> @@ -650,8 +650,7 @@ rpcrdma_inline_fixup(struct rpc_rqst *rqst, char *srcp, int copy_len, int pad)
> page_base = 0;
> }
> rqst->rq_rcv_buf.page_len = olen - copy_len;
> - } else
> - rqst->rq_rcv_buf.page_len = 0;
> + }
>
> if (copy_len && rqst->rq_rcv_buf.tail[0].iov_len) {
> curlen = copy_len;
> diff --git a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
> index 0ce7552..8d904e4 100644
> --- a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
> +++ b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
> @@ -90,6 +90,7 @@ static void rdma_build_arg_xdr(struct svc_rqst *rqstp,
> sge_no++;
> }
> rqstp->rq_respages = &rqstp->rq_pages[sge_no];
> + rqstp->rq_next_page = rqstp->rq_respages + 1;
>
> /* We should never run out of SGE because the limit is defined to
> * support the max allowed RPC data length
> @@ -169,6 +170,7 @@ static int map_read_chunks(struct svcxprt_rdma *xprt,
> */
> head->arg.pages[page_no] = rqstp->rq_arg.pages[page_no];
> rqstp->rq_respages = &rqstp->rq_arg.pages[page_no+1];
> + rqstp->rq_next_page = rqstp->rq_respages + 1;
>
> byte_count -= sge_bytes;
> ch_bytes -= sge_bytes;
> @@ -276,6 +278,7 @@ static int fast_reg_read_chunks(struct svcxprt_rdma *xprt,
>
> /* rq_respages points one past arg pages */
> rqstp->rq_respages = &rqstp->rq_arg.pages[page_no];
> + rqstp->rq_next_page = rqstp->rq_respages + 1;
>
> /* Create the reply and chunk maps */
> offset = 0;
> @@ -520,13 +523,6 @@ next_sge:
> for (ch_no = 0; &rqstp->rq_pages[ch_no] < rqstp->rq_respages; ch_no++)
> rqstp->rq_pages[ch_no] = NULL;
>
> - /*
> - * Detach res pages. If svc_release sees any it will attempt to
> - * put them.
> - */
> - while (rqstp->rq_next_page != rqstp->rq_respages)
> - *(--rqstp->rq_next_page) = NULL;
> -
> return err;
> }
>
> @@ -550,7 +546,7 @@ static int rdma_read_complete(struct svc_rqst *rqstp,
>
> /* rq_respages starts after the last arg page */
> rqstp->rq_respages = &rqstp->rq_arg.pages[page_no];
> - rqstp->rq_next_page = &rqstp->rq_arg.pages[page_no];
> + rqstp->rq_next_page = rqstp->rq_respages + 1;
>
> /* Rebuild rq_arg head and tail. */
> rqstp->rq_arg.head[0] = head->arg.head[0];
> diff --git a/net/sunrpc/xprtrdma/svc_rdma_sendto.c b/net/sunrpc/xprtrdma/svc_rdma_sendto.c
> index c1d124d..11e90f8 100644
> --- a/net/sunrpc/xprtrdma/svc_rdma_sendto.c
> +++ b/net/sunrpc/xprtrdma/svc_rdma_sendto.c
> @@ -625,6 +625,7 @@ static int send_reply(struct svcxprt_rdma *rdma,
> if (page_no+1 >= sge_no)
> ctxt->sge[page_no+1].length = 0;
> }
> + rqstp->rq_next_page = rqstp->rq_respages + 1;
> BUG_ON(sge_no > rdma->sc_max_sge);
> memset(&send_wr, 0, sizeof send_wr);
> ctxt->wr_op = IB_WR_SEND;
>
> --
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This seems to fix the oopses I was seeing when issuing NFS WRITEs to
the server:
Tested-by: Jeff Layton <jlayton@xxxxxxxxxx>
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