xprtrdma: Move decoded header fields into rpcrdma_rep

Clean up: Make it easier to pass the decoded XID, vers, credits, and
proc fields around by moving these variables into struct rpcrdma_rep.

Note: the credits field will be handled in a subsequent patch.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

2 files changed, 20 insertions, 19 deletions

diff --git a/net/sunrpc/xprtrdma/rpc_rdma.c b/net/sunrpc/xprtrdma/rpc_rdma.c
index 20c9e4cbaa73..e355cd322a32 100644
--- a/net/sunrpc/xprtrdma/rpc_rdma.c
+++ b/net/sunrpc/xprtrdma/rpc_rdma.c
@@ -970,14 +970,13 @@ rpcrdma_mark_remote_invalidation(struct list_head *mws,
  * straightforward to check the RPC header's direction field.
  */
 static bool
-rpcrdma_is_bcall(struct rpcrdma_xprt *r_xprt, struct rpcrdma_rep *rep,
-                 __be32 xid, __be32 proc)
+rpcrdma_is_bcall(struct rpcrdma_xprt *r_xprt, struct rpcrdma_rep *rep)
 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
 {
         struct xdr_stream *xdr = &rep->rr_stream;
         __be32 *p;
 
-        if (proc != rdma_msg)
+        if (rep->rr_proc != rdma_msg)
                 return false;
 
         /* Peek at stream contents without advancing. */
@@ -992,7 +991,7 @@ rpcrdma_is_bcall(struct rpcrdma_xprt *r_xprt, struct rpcrdma_rep *rep,
                 return false;
 
         /* RPC header */
-        if (*p++ != xid)
+        if (*p++ != rep->rr_xid)
                 return false;
         if (*p != cpu_to_be32(RPC_CALL))
                 return false;
@@ -1224,41 +1223,40 @@ rpcrdma_reply_handler(struct work_struct *work)
                         container_of(work, struct rpcrdma_rep, rr_work);
         struct rpcrdma_xprt *r_xprt = rep->rr_rxprt;
         struct rpc_xprt *xprt = &r_xprt->rx_xprt;
-        struct xdr_stream *xdr = &rep->rr_stream;
         struct rpcrdma_req *req;
         struct rpc_rqst *rqst;
-        __be32 *p, xid, vers, proc;
         unsigned long cwnd;
         int status;
+        __be32 *p;
 
         dprintk("RPC:       %s: incoming rep %p\n", __func__, rep);
 
         if (rep->rr_hdrbuf.head[0].iov_len == 0)
                 goto out_badstatus;
 
-        xdr_init_decode(xdr, &rep->rr_hdrbuf,
+        xdr_init_decode(&rep->rr_stream, &rep->rr_hdrbuf,
                         rep->rr_hdrbuf.head[0].iov_base);
 
         /* Fixed transport header fields */
-        p = xdr_inline_decode(xdr, 4 * sizeof(*p));
+        p = xdr_inline_decode(&rep->rr_stream, 4 * sizeof(*p));
         if (unlikely(!p))
                 goto out_shortreply;
-        xid = *p++;
-        vers = *p++;
+        rep->rr_xid = *p++;
+        rep->rr_vers = *p++;
         p++;    /* credits */
-        proc = *p++;
+        rep->rr_proc = *p++;
 
-        if (vers != rpcrdma_version)
+        if (rep->rr_vers != rpcrdma_version)
                 goto out_badversion;
 
-        if (rpcrdma_is_bcall(r_xprt, rep, xid, proc))
+        if (rpcrdma_is_bcall(r_xprt, rep))
                 return;
 
         /* Match incoming rpcrdma_rep to an rpcrdma_req to
          * get context for handling any incoming chunks.
          */
         spin_lock(&xprt->recv_lock);
-        rqst = xprt_lookup_rqst(xprt, xid);
+        rqst = xprt_lookup_rqst(xprt, rep->rr_xid);
         if (!rqst)
                 goto out_norqst;
         xprt_pin_rqst(rqst);
@@ -1267,7 +1265,7 @@ rpcrdma_reply_handler(struct work_struct *work)
         req->rl_reply = rep;
 
         dprintk("RPC:       %s: reply %p completes request %p (xid 0x%08x)\n",
-                __func__, rep, req, be32_to_cpu(xid));
+                __func__, rep, req, be32_to_cpu(rep->rr_xid));
 
         /* Invalidate and unmap the data payloads before waking the
          * waiting application. This guarantees the memory regions
@@ -1284,7 +1282,7 @@ rpcrdma_reply_handler(struct work_struct *work)
 
         xprt->reestablish_timeout = 0;
 
-        switch (proc) {
+        switch (rep->rr_proc) {
         case rdma_msg:
                 status = rpcrdma_decode_msg(r_xprt, rep, rqst);
                 break;
@@ -1324,7 +1322,7 @@ out_badstatus:
 
 out_badversion:
         dprintk("RPC:       %s: invalid version %d\n",
-                __func__, be32_to_cpu(vers));
+                __func__, be32_to_cpu(rep->rr_vers));
         goto repost;
 
 /* If the incoming reply terminated a pending RPC, the next
@@ -1333,7 +1331,7 @@ out_badversion:
  */
 out_badheader:
         dprintk("RPC: %5u %s: invalid rpcrdma reply (type %u)\n",
-                rqst->rq_task->tk_pid, __func__, be32_to_cpu(proc));
+                rqst->rq_task->tk_pid, __func__, be32_to_cpu(rep->rr_proc));
         r_xprt->rx_stats.bad_reply_count++;
         status = -EIO;
         goto out;
@@ -1345,7 +1343,7 @@ out_badheader:
 out_norqst:
         spin_unlock(&xprt->recv_lock);
         dprintk("RPC:       %s: no match for incoming xid 0x%08x\n",
-                __func__, be32_to_cpu(xid));
+                __func__, be32_to_cpu(rep->rr_xid));
         goto repost;
 
 out_shortreply:
diff --git a/net/sunrpc/xprtrdma/xprt_rdma.h b/net/sunrpc/xprtrdma/xprt_rdma.h
index 74e017477e72..858b4c52047d 100644
--- a/net/sunrpc/xprtrdma/xprt_rdma.h
+++ b/net/sunrpc/xprtrdma/xprt_rdma.h
@@ -218,6 +218,9 @@ enum {
 
 struct rpcrdma_rep {
         struct ib_cqe           rr_cqe;
+        __be32                  rr_xid;
+        __be32                  rr_vers;
+        __be32                  rr_proc;
         int                     rr_wc_flags;
         u32                     rr_inv_rkey;
         struct rpcrdma_regbuf   *rr_rdmabuf;