xprtrdma: Perform a full marshal on retransmit
Commit 6ab59945f292 ("xprtrdma: Update rkeys after transport
reconnect" added logic in the ->send_request path to update the
chunk list when an RPC/RDMA request is retransmitted.
Note that rpc_xdr_encode() resets and re-encodes the entire RPC
send buffer for each retransmit of an RPC. The RPC send buffer
is not preserved from the previous transmission of an RPC.
Revert 6ab59945f292, and instead, just force each request to be
fully marshaled every time through ->send_request. This should
preserve the fix from 6ab59945f292, while also performing pullup
during retransmits.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Acked-by: Sagi Grimberg <sagig@mellanox.com>
Tested-by: Devesh Sharma <Devesh.Sharma@Emulex.Com>
Tested-by: Meghana Cheripady <Meghana.Cheripady@Emulex.Com>
Tested-by: Veeresh U. Kokatnur <veereshuk@chelsio.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
diff --git a/net/sunrpc/xprtrdma/rpc_rdma.c b/net/sunrpc/xprtrdma/rpc_rdma.c
index 91ffde8..41456d9 100644
--- a/net/sunrpc/xprtrdma/rpc_rdma.c
+++ b/net/sunrpc/xprtrdma/rpc_rdma.c
@@ -53,6 +53,14 @@
# define RPCDBG_FACILITY RPCDBG_TRANS
#endif
+enum rpcrdma_chunktype {
+ rpcrdma_noch = 0,
+ rpcrdma_readch,
+ rpcrdma_areadch,
+ rpcrdma_writech,
+ rpcrdma_replych
+};
+
#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
static const char transfertypes[][12] = {
"pure inline", /* no chunks */
@@ -284,28 +292,6 @@
}
/*
- * Marshal chunks. This routine returns the header length
- * consumed by marshaling.
- *
- * Returns positive RPC/RDMA header size, or negative errno.
- */
-
-ssize_t
-rpcrdma_marshal_chunks(struct rpc_rqst *rqst, ssize_t result)
-{
- struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
- struct rpcrdma_msg *headerp = rdmab_to_msg(req->rl_rdmabuf);
-
- if (req->rl_rtype != rpcrdma_noch)
- result = rpcrdma_create_chunks(rqst, &rqst->rq_snd_buf,
- headerp, req->rl_rtype);
- else if (req->rl_wtype != rpcrdma_noch)
- result = rpcrdma_create_chunks(rqst, &rqst->rq_rcv_buf,
- headerp, req->rl_wtype);
- return result;
-}
-
-/*
* Copy write data inline.
* This function is used for "small" requests. Data which is passed
* to RPC via iovecs (or page list) is copied directly into the
@@ -397,6 +383,7 @@
char *base;
size_t rpclen, padlen;
ssize_t hdrlen;
+ enum rpcrdma_chunktype rtype, wtype;
struct rpcrdma_msg *headerp;
/*
@@ -433,13 +420,13 @@
* into pages; otherwise use reply chunks.
*/
if (rqst->rq_rcv_buf.buflen <= RPCRDMA_INLINE_READ_THRESHOLD(rqst))
- req->rl_wtype = rpcrdma_noch;
+ wtype = rpcrdma_noch;
else if (rqst->rq_rcv_buf.page_len == 0)
- req->rl_wtype = rpcrdma_replych;
+ wtype = rpcrdma_replych;
else if (rqst->rq_rcv_buf.flags & XDRBUF_READ)
- req->rl_wtype = rpcrdma_writech;
+ wtype = rpcrdma_writech;
else
- req->rl_wtype = rpcrdma_replych;
+ wtype = rpcrdma_replych;
/*
* Chunks needed for arguments?
@@ -456,16 +443,16 @@
* TBD check NFSv4 setacl
*/
if (rqst->rq_snd_buf.len <= RPCRDMA_INLINE_WRITE_THRESHOLD(rqst))
- req->rl_rtype = rpcrdma_noch;
+ rtype = rpcrdma_noch;
else if (rqst->rq_snd_buf.page_len == 0)
- req->rl_rtype = rpcrdma_areadch;
+ rtype = rpcrdma_areadch;
else
- req->rl_rtype = rpcrdma_readch;
+ rtype = rpcrdma_readch;
/* The following simplification is not true forever */
- if (req->rl_rtype != rpcrdma_noch && req->rl_wtype == rpcrdma_replych)
- req->rl_wtype = rpcrdma_noch;
- if (req->rl_rtype != rpcrdma_noch && req->rl_wtype != rpcrdma_noch) {
+ if (rtype != rpcrdma_noch && wtype == rpcrdma_replych)
+ wtype = rpcrdma_noch;
+ if (rtype != rpcrdma_noch && wtype != rpcrdma_noch) {
dprintk("RPC: %s: cannot marshal multiple chunk lists\n",
__func__);
return -EIO;
@@ -479,7 +466,7 @@
* When padding is in use and applies to the transfer, insert
* it and change the message type.
*/
- if (req->rl_rtype == rpcrdma_noch) {
+ if (rtype == rpcrdma_noch) {
padlen = rpcrdma_inline_pullup(rqst,
RPCRDMA_INLINE_PAD_VALUE(rqst));
@@ -494,7 +481,7 @@
headerp->rm_body.rm_padded.rm_pempty[1] = xdr_zero;
headerp->rm_body.rm_padded.rm_pempty[2] = xdr_zero;
hdrlen += 2 * sizeof(u32); /* extra words in padhdr */
- if (req->rl_wtype != rpcrdma_noch) {
+ if (wtype != rpcrdma_noch) {
dprintk("RPC: %s: invalid chunk list\n",
__func__);
return -EIO;
@@ -515,18 +502,26 @@
* on receive. Therefore, we request a reply chunk
* for non-writes wherever feasible and efficient.
*/
- if (req->rl_wtype == rpcrdma_noch)
- req->rl_wtype = rpcrdma_replych;
+ if (wtype == rpcrdma_noch)
+ wtype = rpcrdma_replych;
}
}
- hdrlen = rpcrdma_marshal_chunks(rqst, hdrlen);
+ if (rtype != rpcrdma_noch) {
+ hdrlen = rpcrdma_create_chunks(rqst, &rqst->rq_snd_buf,
+ headerp, rtype);
+ wtype = rtype; /* simplify dprintk */
+
+ } else if (wtype != rpcrdma_noch) {
+ hdrlen = rpcrdma_create_chunks(rqst, &rqst->rq_rcv_buf,
+ headerp, wtype);
+ }
if (hdrlen < 0)
return hdrlen;
dprintk("RPC: %s: %s: hdrlen %zd rpclen %zd padlen %zd"
" headerp 0x%p base 0x%p lkey 0x%x\n",
- __func__, transfertypes[req->rl_wtype], hdrlen, rpclen, padlen,
+ __func__, transfertypes[wtype], hdrlen, rpclen, padlen,
headerp, base, rdmab_lkey(req->rl_rdmabuf));
/*
diff --git a/net/sunrpc/xprtrdma/transport.c b/net/sunrpc/xprtrdma/transport.c
index 9be7f97..97f6562 100644
--- a/net/sunrpc/xprtrdma/transport.c
+++ b/net/sunrpc/xprtrdma/transport.c
@@ -608,10 +608,7 @@
struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
int rc = 0;
- if (req->rl_niovs == 0)
- rc = rpcrdma_marshal_req(rqst);
- else if (r_xprt->rx_ia.ri_memreg_strategy != RPCRDMA_ALLPHYSICAL)
- rc = rpcrdma_marshal_chunks(rqst, 0);
+ rc = rpcrdma_marshal_req(rqst);
if (rc < 0)
goto failed_marshal;
diff --git a/net/sunrpc/xprtrdma/xprt_rdma.h b/net/sunrpc/xprtrdma/xprt_rdma.h
index 0a16fb6..c8afd83 100644
--- a/net/sunrpc/xprtrdma/xprt_rdma.h
+++ b/net/sunrpc/xprtrdma/xprt_rdma.h
@@ -143,14 +143,6 @@
return (struct rpcrdma_msg *)rb->rg_base;
}
-enum rpcrdma_chunktype {
- rpcrdma_noch = 0,
- rpcrdma_readch,
- rpcrdma_areadch,
- rpcrdma_writech,
- rpcrdma_replych
-};
-
/*
* struct rpcrdma_rep -- this structure encapsulates state required to recv
* and complete a reply, asychronously. It needs several pieces of
@@ -258,7 +250,6 @@
unsigned int rl_niovs; /* 0, 2 or 4 */
unsigned int rl_nchunks; /* non-zero if chunks */
unsigned int rl_connect_cookie; /* retry detection */
- enum rpcrdma_chunktype rl_rtype, rl_wtype;
struct rpcrdma_buffer *rl_buffer; /* home base for this structure */
struct rpcrdma_rep *rl_reply;/* holder for reply buffer */
struct ib_sge rl_send_iov[4]; /* for active requests */
@@ -418,7 +409,6 @@
/*
* RPC/RDMA protocol calls - xprtrdma/rpc_rdma.c
*/
-ssize_t rpcrdma_marshal_chunks(struct rpc_rqst *, ssize_t);
int rpcrdma_marshal_req(struct rpc_rqst *);
size_t rpcrdma_max_payload(struct rpcrdma_xprt *);
