[PATCH v1 04/13] xprtrdma: Update rkeys after transport reconnect

Chuck Lever
2014-06-23T22:39:34Z

Various reports of:

rpcrdma_qp_async_error_upcall: QP error 3 on device mlx4_0
ep ffff8800bfd3e848

Ensure that rkeys in already-marshalled RPC/RDMA headers are
refreshed after the QP has been replaced by a reconnect.

BugLink: https://bugzilla.linux-nfs.org/show_bug.cgi?id=249
Suggested-by: Selvin Xavier <Selvin.Xavier-iH1Dq9VlAzfQT0dZR+AlfA@public.gmane.org>
Signed-off-by: Chuck Lever <chuck.lever-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
---
net/sunrpc/xprtrdma/rpc_rdma.c | 77 ++++++++++++++++++++-------------------
net/sunrpc/xprtrdma/transport.c | 11 +++---
net/sunrpc/xprtrdma/xprt_rdma.h | 10 +++++
3 files changed, 56 insertions(+), 42 deletions(-)

diff --git a/net/sunrpc/xprtrdma/rpc_rdma.c b/net/sunrpc/xprtrdma/rpc_rdma.c
index 693966d..6eeb6d2 100644
--- a/net/sunrpc/xprtrdma/rpc_rdma.c
+++ b/net/sunrpc/xprtrdma/rpc_rdma.c
@@ -53,14 +53,6 @@
# define RPCDBG_FACILITY RPCDBG_TRANS
#endif

-enum rpcrdma_chunktype {
- rpcrdma_noch = 0,
- rpcrdma_readch,
- rpcrdma_areadch,
- rpcrdma_writech,
- rpcrdma_replych
-};
-
#ifdef RPC_DEBUG
static const char transfertypes[][12] = {
"pure inline", /* no chunks */
@@ -286,6 +278,30 @@ out:
}

/*
+ * 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 = (struct rpcrdma_msg *)req->rl_base;
+
+ 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
@@ -377,7 +393,6 @@ rpcrdma_marshal_req(struct rpc_rqst *rqst)
char *base;
size_t rpclen, padlen;
ssize_t hdrlen;
- enum rpcrdma_chunktype rtype, wtype;
struct rpcrdma_msg *headerp;

/*
@@ -415,13 +430,13 @@ rpcrdma_marshal_req(struct rpc_rqst *rqst)
* into pages; otherwise use reply chunks.
*/
if (rqst->rq_rcv_buf.buflen <= RPCRDMA_INLINE_READ_THRESHOLD(rqst))
- wtype = rpcrdma_noch;
+ req->rl_wtype = rpcrdma_noch;
else if (rqst->rq_rcv_buf.page_len == 0)
- wtype = rpcrdma_replych;
+ req->rl_wtype = rpcrdma_replych;
else if (rqst->rq_rcv_buf.flags & XDRBUF_READ)
- wtype = rpcrdma_writech;
+ req->rl_wtype = rpcrdma_writech;
else
- wtype = rpcrdma_replych;
+ req->rl_wtype = rpcrdma_replych;

/*
* Chunks needed for arguments?
@@ -438,16 +453,16 @@ rpcrdma_marshal_req(struct rpc_rqst *rqst)
* TBD check NFSv4 setacl
*/
if (rqst->rq_snd_buf.len <= RPCRDMA_INLINE_WRITE_THRESHOLD(rqst))
- rtype = rpcrdma_noch;
+ req->rl_rtype = rpcrdma_noch;
else if (rqst->rq_snd_buf.page_len == 0)
- rtype = rpcrdma_areadch;
+ req->rl_rtype = rpcrdma_areadch;
else
- rtype = rpcrdma_readch;
+ req->rl_rtype = rpcrdma_readch;

/* The following simplification is not true forever */
- if (rtype != rpcrdma_noch && wtype == rpcrdma_replych)
- wtype = rpcrdma_noch;
- if (rtype != rpcrdma_noch && wtype != rpcrdma_noch) {
+ 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) {
dprintk("RPC: %s: cannot marshal multiple chunk lists\n",
__func__);
return -EIO;
@@ -461,7 +476,7 @@ rpcrdma_marshal_req(struct rpc_rqst *rqst)
* When padding is in use and applies to the transfer, insert
* it and change the message type.
*/
- if (rtype == rpcrdma_noch) {
+ if (req->rl_rtype == rpcrdma_noch) {

padlen = rpcrdma_inline_pullup(rqst,
RPCRDMA_INLINE_PAD_VALUE(rqst));
@@ -476,7 +491,7 @@ rpcrdma_marshal_req(struct rpc_rqst *rqst)
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 (wtype != rpcrdma_noch) {
+ if (req->rl_wtype != rpcrdma_noch) {
dprintk("RPC: %s: invalid chunk list\n",
__func__);
return -EIO;
@@ -497,30 +512,18 @@ rpcrdma_marshal_req(struct rpc_rqst *rqst)
* on receive. Therefore, we request a reply chunk
* for non-writes wherever feasible and efficient.
*/
- if (wtype == rpcrdma_noch)
- wtype = rpcrdma_replych;
+ if (req->rl_wtype == rpcrdma_noch)
+ req->rl_wtype = rpcrdma_replych;
}
}

- /*
- * Marshal chunks. This routine will return the header length
- * consumed by marshaling.
- */
- 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);
- }
+ hdrlen = rpcrdma_marshal_chunks(rqst, hdrlen);
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[wtype], hdrlen, rpclen, padlen,
+ __func__, transfertypes[req->rl_wtype], hdrlen, rpclen, padlen,
headerp, base, req->rl_iov.lkey);

/*
diff --git a/net/sunrpc/xprtrdma/transport.c b/net/sunrpc/xprtrdma/transport.c
index 4185102..f6d280b 100644
--- a/net/sunrpc/xprtrdma/transport.c
+++ b/net/sunrpc/xprtrdma/transport.c
@@ -597,13 +597,14 @@ xprt_rdma_send_request(struct rpc_task *task)
struct rpc_xprt *xprt = rqst->rq_xprt;
struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
- int rc;
+ int rc = 0;

- if (req->rl_niovs == 0) {
+ if (req->rl_niovs == 0)
rc = rpcrdma_marshal_req(rqst);
- if (rc < 0)
- goto failed_marshal;
- }
+ else if (r_xprt->rx_ia.ri_memreg_strategy == RPCRDMA_FRMR)
+ rc = rpcrdma_marshal_chunks(rqst, 0);
+ if (rc < 0)
+ goto failed_marshal;

if (req->rl_reply == NULL) /* e.g. reconnection */
rpcrdma_recv_buffer_get(req);
diff --git a/net/sunrpc/xprtrdma/xprt_rdma.h b/net/sunrpc/xprtrdma/xprt_rdma.h
index f3d86b2..c270e59 100644
--- a/net/sunrpc/xprtrdma/xprt_rdma.h
+++ b/net/sunrpc/xprtrdma/xprt_rdma.h
@@ -99,6 +99,14 @@ struct rpcrdma_ep {
#define INIT_CQCOUNT(ep) atomic_set(&(ep)->rep_cqcount, (ep)->rep_cqinit)
#define DECR_CQCOUNT(ep) atomic_sub_return(1, &(ep)->rep_cqcount)

+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
@@ -192,6 +200,7 @@ struct rpcrdma_req {
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 rpcrdma_mr_seg rl_segments[RPCRDMA_MAX_SEGS];/* chunk segments */
@@ -347,6 +356,7 @@ void rpcrdma_reply_handler(struct rpcrdma_rep *);
/*
* 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 *);