Clean up: Pass in just the piece of the svc_rqst that is needed
here.
While we're in the area, add an informative documenting comment.
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---
include/linux/sunrpc/svc_rdma.h | 2 +-
net/sunrpc/xprtrdma/svc_rdma_marshal.c | 31 +++++++++++++++++++++----------
net/sunrpc/xprtrdma/svc_rdma_recvfrom.c | 2 +-
3 files changed, 23 insertions(+), 12 deletions(-)
diff --git a/include/linux/sunrpc/svc_rdma.h b/include/linux/sunrpc/svc_rdma.h
index 3081339..d6917b8 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 xdr_buf *);
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 765bca4..b3fd068 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_marshal.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_marshal.c
@@ -145,19 +145,31 @@ static __be32 *decode_reply_array(__be32 *va, __be32 *vaend)
return (__be32 *)&ary->wc_array[nchunks];
}
-int svc_rdma_xdr_decode_req(struct rpcrdma_msg *rmsgp, struct svc_rqst *rqstp)
+/**
+ * svc_rdma_xdr_decode_req - Parse incoming RPC-over-RDMA header
+ * @rq_arg: buffer containing xprt header and possibly an RPC message
+ *
+ * On entry, xdr->head[0].iov_base points to first byte in the
+ * RPC-over-RDMA header.
+ *
+ * On successful exit, head[0] points to first byte in the RPC
+ * message, and the length of the RPC-over-RDMA header is returned.
+ */
+int svc_rdma_xdr_decode_req(struct xdr_buf *rq_arg)
{
+ struct rpcrdma_msg *rmsgp;
__be32 *va, *vaend;
unsigned int len;
u32 hdr_len;
/* Verify that there's enough bytes for header + something */
- if (rqstp->rq_arg.len <= RPCRDMA_HDRLEN_ERR) {
+ if (rq_arg->len <= RPCRDMA_HDRLEN_ERR) {
dprintk("svcrdma: header too short = %d\n",
- rqstp->rq_arg.len);
+ rq_arg->len);
return -EINVAL;
}
+ rmsgp = (struct rpcrdma_msg *)rq_arg->head[0].iov_base;
if (rmsgp->rm_vers != rpcrdma_version) {
dprintk("%s: bad version %u\n", __func__,
be32_to_cpu(rmsgp->rm_vers));
@@ -189,10 +201,10 @@ int svc_rdma_xdr_decode_req(struct rpcrdma_msg *rmsgp, struct svc_rqst *rqstp)
be32_to_cpu(rmsgp->rm_body.rm_padded.rm_thresh);
va = &rmsgp->rm_body.rm_padded.rm_pempty[4];
- rqstp->rq_arg.head[0].iov_base = va;
+ rq_arg->head[0].iov_base = va;
len = (u32)((unsigned long)va - (unsigned long)rmsgp);
- rqstp->rq_arg.head[0].iov_len -= len;
- if (len > rqstp->rq_arg.len)
+ rq_arg->head[0].iov_len -= len;
+ if (len > rq_arg->len)
return -EINVAL;
return len;
default:
@@ -205,7 +217,7 @@ int svc_rdma_xdr_decode_req(struct rpcrdma_msg *rmsgp, struct svc_rqst *rqstp)
* chunk list and a reply chunk list.
*/
va = &rmsgp->rm_body.rm_chunks[0];
- vaend = (__be32 *)((unsigned long)rmsgp + rqstp->rq_arg.len);
+ vaend = (__be32 *)((unsigned long)rmsgp + rq_arg->len);
va = decode_read_list(va, vaend);
if (!va) {
dprintk("svcrdma: failed to decode read list\n");
@@ -222,10 +234,9 @@ int svc_rdma_xdr_decode_req(struct rpcrdma_msg *rmsgp, struct svc_rqst *rqstp)
return -EINVAL;
}
- rqstp->rq_arg.head[0].iov_base = va;
+ rq_arg->head[0].iov_base = va;
hdr_len = (unsigned long)va - (unsigned long)rmsgp;
- rqstp->rq_arg.head[0].iov_len -= hdr_len;
-
+ rq_arg->head[0].iov_len -= hdr_len;
return hdr_len;
}
diff --git a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
index 1b72f35..c984b0a 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
@@ -636,7 +636,7 @@ int svc_rdma_recvfrom(struct svc_rqst *rqstp)
/* Decode the RDMA header. */
rmsgp = (struct rpcrdma_msg *)rqstp->rq_arg.head[0].iov_base;
- ret = svc_rdma_xdr_decode_req(rmsgp, rqstp);
+ ret = svc_rdma_xdr_decode_req(&rqstp->rq_arg);
if (ret < 0)
goto out_err;
if (ret == 0)
--
To unsubscribe from this list: send the line "unsubscribe linux-nfs" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
