Now that svc_rdma_sendto has been renovated, svc_rdma_send_error can
be refactored to reduce code duplication and remove C structure-
based XDR encoding. It is also relocated to the source file that
contains its only caller.
This is a refactoring change only.
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
Reviewed-by: Sagi Grimberg <sagi@xxxxxxxxxxx>
---
include/linux/sunrpc/rpc_rdma.h | 3 ++
include/linux/sunrpc/svc_rdma.h | 5 ---
net/sunrpc/xprtrdma/svc_rdma_marshal.c | 19 -----------
net/sunrpc/xprtrdma/svc_rdma_recvfrom.c | 52 ++++++++++++++++++++++++++++++-
net/sunrpc/xprtrdma/svc_rdma_sendto.c | 43 --------------------------
5 files changed, 54 insertions(+), 68 deletions(-)
diff --git a/include/linux/sunrpc/rpc_rdma.h b/include/linux/sunrpc/rpc_rdma.h
index 245fc59..b7e85b3 100644
--- a/include/linux/sunrpc/rpc_rdma.h
+++ b/include/linux/sunrpc/rpc_rdma.h
@@ -143,6 +143,9 @@ enum rpcrdma_proc {
#define rdma_done cpu_to_be32(RDMA_DONE)
#define rdma_error cpu_to_be32(RDMA_ERROR)
+#define err_vers cpu_to_be32(ERR_VERS)
+#define err_chunk cpu_to_be32(ERR_CHUNK)
+
/*
* Private extension to RPC-over-RDMA Version One.
* Message passed during RDMA-CM connection set-up.
diff --git a/include/linux/sunrpc/svc_rdma.h b/include/linux/sunrpc/svc_rdma.h
index 599ee03..a770d20 100644
--- a/include/linux/sunrpc/svc_rdma.h
+++ b/include/linux/sunrpc/svc_rdma.h
@@ -209,9 +209,6 @@ extern int svc_rdma_handle_bc_reply(struct rpc_xprt *xprt,
/* svc_rdma_marshal.c */
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 *);
extern void svc_rdma_xdr_encode_reply_array(struct rpcrdma_write_array *, int);
extern void svc_rdma_xdr_encode_array_chunk(struct rpcrdma_write_array *, int,
__be32, __be64, u32);
@@ -244,8 +241,6 @@ extern int svc_rdma_post_send_wr(struct svcxprt_rdma *rdma,
struct svc_rdma_op_ctxt *ctxt,
int num_sge, u32 inv_rkey);
extern int svc_rdma_sendto(struct svc_rqst *);
-extern void svc_rdma_send_error(struct svcxprt_rdma *, struct rpcrdma_msg *,
- int);
/* svc_rdma_transport.c */
extern void svc_rdma_wc_send(struct ib_cq *, struct ib_wc *);
diff --git a/net/sunrpc/xprtrdma/svc_rdma_marshal.c b/net/sunrpc/xprtrdma/svc_rdma_marshal.c
index 1c4aabf..ae58a89 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_marshal.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_marshal.c
@@ -167,25 +167,6 @@ int svc_rdma_xdr_decode_req(struct xdr_buf *rq_arg)
return -EINVAL;
}
-int svc_rdma_xdr_encode_error(struct svcxprt_rdma *xprt,
- struct rpcrdma_msg *rmsgp,
- enum rpcrdma_errcode err, __be32 *va)
-{
- __be32 *startp = va;
-
- *va++ = rmsgp->rm_xid;
- *va++ = rmsgp->rm_vers;
- *va++ = xprt->sc_fc_credits;
- *va++ = rdma_error;
- *va++ = cpu_to_be32(err);
- if (err == ERR_VERS) {
- *va++ = rpcrdma_version;
- *va++ = rpcrdma_version;
- }
-
- return (int)((unsigned long)va - (unsigned long)startp);
-}
-
/**
* svc_rdma_xdr_get_reply_hdr_length - Get length of Reply transport header
* @rdma_resp: buffer containing Reply transport header
diff --git a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
index f7b2daf..7435cb6 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
@@ -558,6 +558,56 @@ static void rdma_read_complete(struct svc_rqst *rqstp,
rqstp->rq_arg.buflen = head->arg.buflen;
}
+static void svc_rdma_send_error(struct svcxprt_rdma *xprt,
+ __be32 *rdma_argp, int status)
+{
+ struct svc_rdma_op_ctxt *ctxt;
+ __be32 *p, *err_msgp;
+ unsigned int length;
+ struct page *page;
+ int ret;
+
+ ret = svc_rdma_repost_recv(xprt, GFP_KERNEL);
+ if (ret)
+ return;
+
+ page = alloc_page(GFP_KERNEL);
+ if (!page)
+ return;
+ err_msgp = page_address(page);
+
+ p = err_msgp;
+ *p++ = *rdma_argp;
+ *p++ = *(rdma_argp + 1);
+ *p++ = xprt->sc_fc_credits;
+ *p++ = rdma_error;
+ if (status == -EPROTONOSUPPORT) {
+ *p++ = err_vers;
+ *p++ = rpcrdma_version;
+ *p++ = rpcrdma_version;
+ } else {
+ *p++ = err_chunk;
+ }
+ length = (unsigned long)p - (unsigned long)err_msgp;
+
+ /* Map transport header; no RPC message payload */
+ ctxt = svc_rdma_get_context(xprt);
+ ret = svc_rdma_map_reply_hdr(xprt, ctxt, err_msgp, length);
+ if (ret) {
+ dprintk("svcrdma: Error %d mapping send for protocol error\n",
+ ret);
+ return;
+ }
+
+ ret = svc_rdma_post_send_wr(xprt, ctxt, 1, 0);
+ if (ret) {
+ dprintk("svcrdma: Error %d posting send for protocol error\n",
+ ret);
+ svc_rdma_unmap_dma(ctxt);
+ svc_rdma_put_context(ctxt, 1);
+ }
+}
+
/* By convention, backchannel calls arrive via rdma_msg type
* messages, and never populate the chunk lists. This makes
* the RPC/RDMA header small and fixed in size, so it is
@@ -686,7 +736,7 @@ int svc_rdma_recvfrom(struct svc_rqst *rqstp)
return ret;
out_err:
- svc_rdma_send_error(rdma_xprt, rmsgp, ret);
+ svc_rdma_send_error(rdma_xprt, &rmsgp->rm_xid, ret);
svc_rdma_put_context(ctxt, 0);
return 0;
diff --git a/net/sunrpc/xprtrdma/svc_rdma_sendto.c b/net/sunrpc/xprtrdma/svc_rdma_sendto.c
index ce62b78..0b646e8 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_sendto.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_sendto.c
@@ -710,46 +710,3 @@ int svc_rdma_sendto(struct svc_rqst *rqstp)
set_bit(XPT_CLOSE, &xprt->xpt_flags);
return -ENOTCONN;
}
-
-void svc_rdma_send_error(struct svcxprt_rdma *xprt, struct rpcrdma_msg *rmsgp,
- int status)
-{
- struct page *p;
- struct svc_rdma_op_ctxt *ctxt;
- enum rpcrdma_errcode err;
- __be32 *va;
- int length;
- int ret;
-
- ret = svc_rdma_repost_recv(xprt, GFP_KERNEL);
- if (ret)
- return;
-
- p = alloc_page(GFP_KERNEL);
- if (!p)
- return;
- va = page_address(p);
-
- /* XDR encode an error reply */
- err = ERR_CHUNK;
- if (status == -EPROTONOSUPPORT)
- err = ERR_VERS;
- length = svc_rdma_xdr_encode_error(xprt, rmsgp, err, va);
-
- /* Map transport header; no RPC message payload */
- ctxt = svc_rdma_get_context(xprt);
- ret = svc_rdma_map_reply_hdr(xprt, ctxt, &rmsgp->rm_xid, length);
- if (ret) {
- dprintk("svcrdma: Error %d mapping send for protocol error\n",
- ret);
- return;
- }
-
- ret = svc_rdma_post_send_wr(xprt, ctxt, 1, 0);
- if (ret) {
- dprintk("svcrdma: Error %d posting send for protocol error\n",
- ret);
- svc_rdma_unmap_dma(ctxt);
- svc_rdma_put_context(ctxt, 1);
- }
-}
--
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