diff options
| author | Chuck Lever <chuck.lever@oracle.com> | 2017-02-07 11:58:15 -0500 |
|---|---|---|
| committer | J. Bruce Fields <bfields@redhat.com> | 2017-02-08 14:41:24 -0500 |
| commit | cbaf58032efca401834518b905f528ac912449e4 (patch) | |
| tree | b1d3b67f20557bc45115931fff8df5aad433f799 /net | |
| parent | b880092109323d1cc608c420fa712d3e19508e13 (diff) | |
| download | linux-cbaf58032efca401834518b905f528ac912449e4.tar.gz linux-cbaf58032efca401834518b905f528ac912449e4.tar.xz | |
svcrdma: Another sendto chunk list parsing update
Commit 5fdca6531434 ("svcrdma: Renovate sendto chunk list parsing")
missed a spot. svc_rdma_xdr_get_reply_hdr_len() also assumes the
Write list has only one Write chunk. There's no harm in making this
code more general.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'net')
| -rw-r--r-- | net/sunrpc/xprtrdma/svc_rdma_marshal.c | 49 | ||||
| -rw-r--r-- | net/sunrpc/xprtrdma/svc_rdma_sendto.c | 3 |
2 files changed, 28 insertions, 24 deletions
diff --git a/net/sunrpc/xprtrdma/svc_rdma_marshal.c b/net/sunrpc/xprtrdma/svc_rdma_marshal.c index 0ba9887f3e22..4e7203439e2f 100644 --- a/net/sunrpc/xprtrdma/svc_rdma_marshal.c +++ b/net/sunrpc/xprtrdma/svc_rdma_marshal.c @@ -260,32 +260,35 @@ int svc_rdma_xdr_encode_error(struct svcxprt_rdma *xprt, return (int)((unsigned long)va - (unsigned long)startp); } -int svc_rdma_xdr_get_reply_hdr_len(struct rpcrdma_msg *rmsgp) +/** + * svc_rdma_xdr_get_reply_hdr_length - Get length of Reply transport header + * @rdma_resp: buffer containing Reply transport header + * + * Returns length of transport header, in bytes. + */ +unsigned int svc_rdma_xdr_get_reply_hdr_len(__be32 *rdma_resp) { - struct rpcrdma_write_array *wr_ary; + unsigned int nsegs; + __be32 *p; - /* There is no read-list in a reply */ + p = rdma_resp; - /* skip write list */ - wr_ary = (struct rpcrdma_write_array *) - &rmsgp->rm_body.rm_chunks[1]; - if (wr_ary->wc_discrim) - wr_ary = (struct rpcrdma_write_array *) - &wr_ary->wc_array[be32_to_cpu(wr_ary->wc_nchunks)]. - wc_target.rs_length; - else - wr_ary = (struct rpcrdma_write_array *) - &wr_ary->wc_nchunks; - - /* skip reply array */ - if (wr_ary->wc_discrim) - wr_ary = (struct rpcrdma_write_array *) - &wr_ary->wc_array[be32_to_cpu(wr_ary->wc_nchunks)]; - else - wr_ary = (struct rpcrdma_write_array *) - &wr_ary->wc_nchunks; - - return (unsigned long) wr_ary - (unsigned long) rmsgp; + /* RPC-over-RDMA V1 replies never have a Read list. */ + p += rpcrdma_fixed_maxsz + 1; + + /* Skip Write list. */ + while (*p++ != xdr_zero) { + nsegs = be32_to_cpup(p++); + p += nsegs * rpcrdma_segment_maxsz; + } + + /* Skip Reply chunk. */ + if (*p++ != xdr_zero) { + nsegs = be32_to_cpup(p++); + p += nsegs * rpcrdma_segment_maxsz; + } + + return (unsigned long)p - (unsigned long)rdma_resp; } void svc_rdma_xdr_encode_write_list(struct rpcrdma_msg *rmsgp, int chunks) diff --git a/net/sunrpc/xprtrdma/svc_rdma_sendto.c b/net/sunrpc/xprtrdma/svc_rdma_sendto.c index ad4d286a83c5..ba76f1617965 100644 --- a/net/sunrpc/xprtrdma/svc_rdma_sendto.c +++ b/net/sunrpc/xprtrdma/svc_rdma_sendto.c @@ -476,7 +476,8 @@ static int send_reply(struct svcxprt_rdma *rdma, /* Prepare the SGE for the RPCRDMA Header */ ctxt->sge[0].lkey = rdma->sc_pd->local_dma_lkey; - ctxt->sge[0].length = svc_rdma_xdr_get_reply_hdr_len(rdma_resp); + ctxt->sge[0].length = + svc_rdma_xdr_get_reply_hdr_len((__be32 *)rdma_resp); ctxt->sge[0].addr = ib_dma_map_page(rdma->sc_cm_id->device, page, 0, ctxt->sge[0].length, DMA_TO_DEVICE); |