Return-Path: Received: from mail-ig0-f195.google.com ([209.85.213.195]:35425 "EHLO mail-ig0-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757005AbcBCPwN (ORCPT ); Wed, 3 Feb 2016 10:52:13 -0500 Subject: [PATCH v1 06/10] svcrdma: Use correct XID in error replies From: Chuck Lever To: linux-rdma@vger.kernel.org, linux-nfs@vger.kernel.org Date: Wed, 03 Feb 2016 10:52:11 -0500 Message-ID: <20160203155211.13868.35749.stgit@klimt.1015granger.net> In-Reply-To: <20160203154411.13868.48268.stgit@klimt.1015granger.net> References: <20160203154411.13868.48268.stgit@klimt.1015granger.net> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Sender: linux-nfs-owner@vger.kernel.org List-ID: When constructing an error reply, svc_rdma_xdr_encode_error() needs to view the client's request message so it can get the failing request's XID. svc_rdma_xdr_decode_req() is supposed to return a pointer to the client's request header. But if it fails to decode the client's message (and thus an error reply is needed) it does not return the pointer. The server then sends a bogus XID in the error reply. Instead, unconditionally generate the pointer to the client's header in svc_rdma_recvfrom(), and pass that pointer to both functions. Signed-off-by: Chuck Lever --- include/linux/sunrpc/svc_rdma.h | 2 +- net/sunrpc/xprtrdma/svc_rdma_marshal.c | 7 +------ net/sunrpc/xprtrdma/svc_rdma_recvfrom.c | 3 ++- 3 files changed, 4 insertions(+), 8 deletions(-) diff --git a/include/linux/sunrpc/svc_rdma.h b/include/linux/sunrpc/svc_rdma.h index 0589918..4ce7b74 100644 --- a/include/linux/sunrpc/svc_rdma.h +++ b/include/linux/sunrpc/svc_rdma.h @@ -199,7 +199,7 @@ extern int svc_rdma_handle_bc_reply(struct rpc_xprt *xprt, struct xdr_buf *rcvbuf); /* svc_rdma_marshal.c */ -extern int svc_rdma_xdr_decode_req(struct rpcrdma_msg **, struct svc_rqst *); +extern int svc_rdma_xdr_decode_req(struct rpcrdma_msg *, struct svc_rqst *); extern int svc_rdma_xdr_encode_error(struct svcxprt_rdma *, struct rpcrdma_msg *, enum rpcrdma_errcode, __be32 *); diff --git a/net/sunrpc/xprtrdma/svc_rdma_marshal.c b/net/sunrpc/xprtrdma/svc_rdma_marshal.c index e2fca76..c011b12 100644 --- a/net/sunrpc/xprtrdma/svc_rdma_marshal.c +++ b/net/sunrpc/xprtrdma/svc_rdma_marshal.c @@ -145,15 +145,11 @@ static __be32 *decode_reply_array(__be32 *va, __be32 *vaend) return (__be32 *)&ary->wc_array[nchunks]; } -int svc_rdma_xdr_decode_req(struct rpcrdma_msg **rdma_req, - struct svc_rqst *rqstp) +int svc_rdma_xdr_decode_req(struct rpcrdma_msg *rmsgp, struct svc_rqst *rqstp) { - struct rpcrdma_msg *rmsgp = NULL; __be32 *va, *vaend; u32 hdr_len; - rmsgp = (struct rpcrdma_msg *)rqstp->rq_arg.head[0].iov_base; - /* Verify that there's enough bytes for header + something */ if (rqstp->rq_arg.len <= RPCRDMA_HDRLEN_MIN) { dprintk("svcrdma: header too short = %d\n", @@ -201,7 +197,6 @@ int svc_rdma_xdr_decode_req(struct rpcrdma_msg **rdma_req, hdr_len = (unsigned long)va - (unsigned long)rmsgp; rqstp->rq_arg.head[0].iov_len -= hdr_len; - *rdma_req = rmsgp; return hdr_len; } diff --git a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c index 0f09052..8f68cb6 100644 --- a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c +++ b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c @@ -653,7 +653,8 @@ int svc_rdma_recvfrom(struct svc_rqst *rqstp) rdma_build_arg_xdr(rqstp, ctxt, ctxt->byte_len); /* Decode the RDMA header. */ - ret = svc_rdma_xdr_decode_req(&rmsgp, rqstp); + rmsgp = (struct rpcrdma_msg *)rqstp->rq_arg.head[0].iov_base; + ret = svc_rdma_xdr_decode_req(rmsgp, rqstp); if (ret < 0) goto out_err; rqstp->rq_xprt_hlen = ret;