These are shorter than RPCRDMA_HDRLEN_MIN, and they need to
complete the waiting RPC.
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---
include/linux/sunrpc/rpc_rdma.h | 11 +++++---
net/sunrpc/xprtrdma/rpc_rdma.c | 51 +++++++++++++++++++++++++++++++++------
2 files changed, 49 insertions(+), 13 deletions(-)
diff --git a/include/linux/sunrpc/rpc_rdma.h b/include/linux/sunrpc/rpc_rdma.h
index 8c6d23c..3b1ff38 100644
--- a/include/linux/sunrpc/rpc_rdma.h
+++ b/include/linux/sunrpc/rpc_rdma.h
@@ -93,6 +93,12 @@ struct rpcrdma_msg {
__be32 rm_pempty[3]; /* 3 empty chunk lists */
} rm_padded;
+ struct {
+ __be32 rm_err;
+ __be32 rm_vers_low;
+ __be32 rm_vers_high;
+ } rm_error;
+
__be32 rm_chunks[0]; /* read, write and reply chunks */
} rm_body;
@@ -109,11 +115,6 @@ enum rpcrdma_errcode {
ERR_CHUNK = 2
};
-struct rpcrdma_err_vers {
- uint32_t rdma_vers_low; /* Version range supported by peer */
- uint32_t rdma_vers_high;
-};
-
enum rpcrdma_proc {
RDMA_MSG = 0, /* An RPC call or reply msg */
RDMA_NOMSG = 1, /* An RPC call or reply msg - separate body */
diff --git a/net/sunrpc/xprtrdma/rpc_rdma.c b/net/sunrpc/xprtrdma/rpc_rdma.c
index 0607391..35f8108 100644
--- a/net/sunrpc/xprtrdma/rpc_rdma.c
+++ b/net/sunrpc/xprtrdma/rpc_rdma.c
@@ -795,7 +795,7 @@ rpcrdma_reply_handler(struct rpcrdma_rep *rep)
struct rpcrdma_xprt *r_xprt = rep->rr_rxprt;
struct rpc_xprt *xprt = &r_xprt->rx_xprt;
__be32 *iptr;
- int rdmalen, status;
+ int rdmalen, status, rmerr;
unsigned long cwnd;
u32 credits;
@@ -803,12 +803,10 @@ rpcrdma_reply_handler(struct rpcrdma_rep *rep)
if (rep->rr_len == RPCRDMA_BAD_LEN)
goto out_badstatus;
- if (rep->rr_len < RPCRDMA_HDRLEN_MIN)
+ if (rep->rr_len < RPCRDMA_HDRLEN_ERR)
goto out_shortreply;
headerp = rdmab_to_msg(rep->rr_rdmabuf);
- if (headerp->rm_vers != rpcrdma_version)
- goto out_badversion;
#if defined(CONFIG_SUNRPC_BACKCHANNEL)
if (rpcrdma_is_bcall(headerp))
goto out_bcall;
@@ -838,6 +836,9 @@ rpcrdma_reply_handler(struct rpcrdma_rep *rep)
req->rl_reply = rep;
xprt->reestablish_timeout = 0;
+ if (headerp->rm_vers != rpcrdma_version)
+ goto out_badversion;
+
/* check for expected message types */
/* The order of some of these tests is important. */
switch (headerp->rm_type) {
@@ -898,6 +899,9 @@ rpcrdma_reply_handler(struct rpcrdma_rep *rep)
status = rdmalen;
break;
+ case rdma_error:
+ goto out_rdmaerr;
+
badheader:
default:
dprintk("%s: invalid rpcrdma reply header (type %d):"
@@ -913,6 +917,7 @@ badheader:
break;
}
+out:
/* Invalidate and flush the data payloads before waking the
* waiting application. This guarantees the memory region is
* properly fenced from the server before the application
@@ -955,13 +960,43 @@ out_bcall:
return;
#endif
-out_shortreply:
- dprintk("RPC: %s: short/invalid reply\n", __func__);
- goto repost;
-
+/* If the incoming reply terminated a pending RPC, the next
+ * RPC call will post a replacement receive buffer as it is
+ * being marshaled.
+ */
out_badversion:
dprintk("RPC: %s: invalid version %d\n",
__func__, be32_to_cpu(headerp->rm_vers));
+ status = -EIO;
+ r_xprt->rx_stats.bad_reply_count++;
+ goto out;
+
+out_rdmaerr:
+ rmerr = be32_to_cpu(headerp->rm_body.rm_error.rm_err);
+ switch (rmerr) {
+ case ERR_VERS:
+ pr_err("%s: server reports header version error (%u-%u)\n",
+ __func__,
+ be32_to_cpu(headerp->rm_body.rm_error.rm_vers_low),
+ be32_to_cpu(headerp->rm_body.rm_error.rm_vers_high));
+ break;
+ case ERR_CHUNK:
+ pr_err("%s: server reports header decoding error\n",
+ __func__);
+ break;
+ default:
+ pr_err("%s: server reports unknown error %d\n",
+ __func__, rmerr);
+ }
+ status = -EREMOTEIO;
+ r_xprt->rx_stats.bad_reply_count++;
+ goto out;
+
+/* If no pending RPC transaction was matched, post a replacement
+ * receive buffer before returning.
+ */
+out_shortreply:
+ dprintk("RPC: %s: short/invalid reply\n", __func__);
goto repost;
out_nomatch:
--
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