[PATCH v3 0/7] Server-side NFS/RDMA changes for v4.11

[PATCH v3 0/7] Server-side NFS/RDMA changes for v4.11

[Chuck Lever]

Hi Bruce-

These are largely clean-ups, except for the last patch. Switching
completion polling from soft IRQ to a worker thread has a few
benefits:

- svcrdma's completion handlers invoke svc_xprt_put(). We discovered
recently svc_xprt_put() is supposed to be called only in a process
context. This will become more important when NFS/RDMA becomes
capable of multi-path operation.

- eventually we'd like to allocate pages for RDMA Read in the
completion handler, and not defer RDMA Read to svc_rdma_recvfrom.
GFP_KERNEL memory allocation can sleep, which is not allowed in soft
IRQ context.

- several places where BH's are disabled can be converted to simple
spin_locks.


Available in the "nfsd-rdma-for-4.11" topic branch of this git repo:

git://git.linux-nfs.org/projects/cel/cel-2.6.git


Or for browsing:

http://git.linux-nfs.org/?p=cel/cel-2.6.git;a=log;h=refs/heads/nfsd-rdma-for-4.11


Changes since v2:
- Rebased on v4.10-rc7
- Addressed Christoph's review comments


Changes since v1:
- Rebased on v4.10-rc6


---

Chuck Lever (7):
      svcrdma: Another sendto chunk list parsing update
      svcrdma: Clean up RPC-over-RDMA Reply header encoder
      svcrdma: Clean up RPC-over-RDMA Call header decoder
      svcrdma: Clean up backchannel send header encoding
      svcrdma: Remove unused sc_dto_q field
      svcrdma: Combine list fields in struct svc_rdma_op_ctxt
      svcrdma: Poll CQs in "workqueue" mode


 include/linux/sunrpc/rpc_rdma.h            |    9 +
 include/linux/sunrpc/svc_rdma.h            |   13 -
 net/sunrpc/xprtrdma/svc_rdma_backchannel.c |   17 +-
 net/sunrpc/xprtrdma/svc_rdma_marshal.c     |  299 ++++++++++------------------
 net/sunrpc/xprtrdma/svc_rdma_recvfrom.c    |   20 +-
 net/sunrpc/xprtrdma/svc_rdma_sendto.c      |   22 +-
 net/sunrpc/xprtrdma/svc_rdma_transport.c   |   61 +++---
 7 files changed, 180 insertions(+), 261 deletions(-)

--
Chuck Lever
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[PATCH v3 0/7] Server-side NFS/RDMA changes for v4.11

[Chuck Lever]

Hi Bruce-

These are largely clean-ups, except for the last patch. Switching
completion polling from soft IRQ to a worker thread has a few
benefits:

- svcrdma's completion handlers invoke svc_xprt_put(). We discovered
recently svc_xprt_put() is supposed to be called only in a process
context. This will become more important when NFS/RDMA becomes
capable of multi-path operation.

- eventually we'd like to allocate pages for RDMA Read in the
completion handler, and not defer RDMA Read to svc_rdma_recvfrom.
GFP_KERNEL memory allocation can sleep, which is not allowed in soft
IRQ context.

- several places where BH's are disabled can be converted to simple
spin_locks.


Available in the "nfsd-rdma-for-4.11" topic branch of this git repo:

git://git.linux-nfs.org/projects/cel/cel-2.6.git


Or for browsing:

http://git.linux-nfs.org/?p=cel/cel-2.6.git;a=log;h=refs/heads/nfsd-rdma-for-4.11


Changes since v2:
- Rebased on v4.10-rc7
- Addressed Christoph's review comments


Changes since v1:
- Rebased on v4.10-rc6


---

Chuck Lever (7):
      svcrdma: Another sendto chunk list parsing update
      svcrdma: Clean up RPC-over-RDMA Reply header encoder
      svcrdma: Clean up RPC-over-RDMA Call header decoder
      svcrdma: Clean up backchannel send header encoding
      svcrdma: Remove unused sc_dto_q field
      svcrdma: Combine list fields in struct svc_rdma_op_ctxt
      svcrdma: Poll CQs in "workqueue" mode


 include/linux/sunrpc/rpc_rdma.h            |    9 +
 include/linux/sunrpc/svc_rdma.h            |   13 -
 net/sunrpc/xprtrdma/svc_rdma_backchannel.c |   17 +-
 net/sunrpc/xprtrdma/svc_rdma_marshal.c     |  299 ++++++++++------------------
 net/sunrpc/xprtrdma/svc_rdma_recvfrom.c    |   20 +-
 net/sunrpc/xprtrdma/svc_rdma_sendto.c      |   22 +-
 net/sunrpc/xprtrdma/svc_rdma_transport.c   |   61 +++---
 7 files changed, 180 insertions(+), 261 deletions(-)

--
Chuck Lever

[PATCH v3 1/7] svcrdma: Another sendto chunk list parsing update

[Chuck Lever]

Commit 5fdca6531434 ("svcrdma: Renovate sendto chunk list parsing")
missed a spot. svc_rdma_xdr_get_reply_hdr_len() also assumes the
Write list has only one Write chunk. There's no harm in making this
code more general.

Signed-off-by: Chuck Lever <chuck.lever-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
---
 include/linux/sunrpc/rpc_rdma.h        |    9 ++++++
 include/linux/sunrpc/svc_rdma.h        |    2 +
 net/sunrpc/xprtrdma/svc_rdma_marshal.c |   49 +++++++++++++++++---------------
 net/sunrpc/xprtrdma/svc_rdma_sendto.c  |    3 +-
 4 files changed, 38 insertions(+), 25 deletions(-)

diff --git a/include/linux/sunrpc/rpc_rdma.h b/include/linux/sunrpc/rpc_rdma.h
index cfda6ad..245fc59 100644
--- a/include/linux/sunrpc/rpc_rdma.h
+++ b/include/linux/sunrpc/rpc_rdma.h
@@ -110,6 +110,15 @@ struct rpcrdma_msg {
 };
 
 /*
+ * XDR sizes, in quads
+ */
+enum {
+	rpcrdma_fixed_maxsz	= 4,
+	rpcrdma_segment_maxsz	= 4,
+	rpcrdma_readchunk_maxsz	= 2 + rpcrdma_segment_maxsz,
+};
+
+/*
  * Smallest RPC/RDMA header: rm_xid through rm_type, then rm_nochunks
  */
 #define RPCRDMA_HDRLEN_MIN	(sizeof(__be32) * 7)
diff --git a/include/linux/sunrpc/svc_rdma.h b/include/linux/sunrpc/svc_rdma.h
index 757fb96..551c518 100644
--- a/include/linux/sunrpc/svc_rdma.h
+++ b/include/linux/sunrpc/svc_rdma.h
@@ -218,7 +218,7 @@ extern void svc_rdma_xdr_encode_reply_header(struct svcxprt_rdma *,
 					     struct rpcrdma_msg *,
 					     struct rpcrdma_msg *,
 					     enum rpcrdma_proc);
-extern int svc_rdma_xdr_get_reply_hdr_len(struct rpcrdma_msg *);
+extern unsigned int svc_rdma_xdr_get_reply_hdr_len(__be32 *rdma_resp);
 
 /* svc_rdma_recvfrom.c */
 extern int svc_rdma_recvfrom(struct svc_rqst *);
diff --git a/net/sunrpc/xprtrdma/svc_rdma_marshal.c b/net/sunrpc/xprtrdma/svc_rdma_marshal.c
index 0ba9887..4e72034 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_marshal.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_marshal.c
@@ -260,32 +260,35 @@ int svc_rdma_xdr_encode_error(struct svcxprt_rdma *xprt,
 	return (int)((unsigned long)va - (unsigned long)startp);
 }
 
-int svc_rdma_xdr_get_reply_hdr_len(struct rpcrdma_msg *rmsgp)
+/**
+ * svc_rdma_xdr_get_reply_hdr_length - Get length of Reply transport header
+ * @rdma_resp: buffer containing Reply transport header
+ *
+ * Returns length of transport header, in bytes.
+ */
+unsigned int svc_rdma_xdr_get_reply_hdr_len(__be32 *rdma_resp)
 {
-	struct rpcrdma_write_array *wr_ary;
+	unsigned int nsegs;
+	__be32 *p;
 
-	/* There is no read-list in a reply */
+	p = rdma_resp;
 
-	/* skip write list */
-	wr_ary = (struct rpcrdma_write_array *)
-		&rmsgp->rm_body.rm_chunks[1];
-	if (wr_ary->wc_discrim)
-		wr_ary = (struct rpcrdma_write_array *)
-			&wr_ary->wc_array[be32_to_cpu(wr_ary->wc_nchunks)].
-			wc_target.rs_length;
-	else
-		wr_ary = (struct rpcrdma_write_array *)
-			&wr_ary->wc_nchunks;
-
-	/* skip reply array */
-	if (wr_ary->wc_discrim)
-		wr_ary = (struct rpcrdma_write_array *)
-			&wr_ary->wc_array[be32_to_cpu(wr_ary->wc_nchunks)];
-	else
-		wr_ary = (struct rpcrdma_write_array *)
-			&wr_ary->wc_nchunks;
-
-	return (unsigned long) wr_ary - (unsigned long) rmsgp;
+	/* RPC-over-RDMA V1 replies never have a Read list. */
+	p += rpcrdma_fixed_maxsz + 1;
+
+	/* Skip Write list. */
+	while (*p++ != xdr_zero) {
+		nsegs = be32_to_cpup(p++);
+		p += nsegs * rpcrdma_segment_maxsz;
+	}
+
+	/* Skip Reply chunk. */
+	if (*p++ != xdr_zero) {
+		nsegs = be32_to_cpup(p++);
+		p += nsegs * rpcrdma_segment_maxsz;
+	}
+
+	return (unsigned long)p - (unsigned long)rdma_resp;
 }
 
 void svc_rdma_xdr_encode_write_list(struct rpcrdma_msg *rmsgp, int chunks)
diff --git a/net/sunrpc/xprtrdma/svc_rdma_sendto.c b/net/sunrpc/xprtrdma/svc_rdma_sendto.c
index ad4d286..ba76f1617 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_sendto.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_sendto.c
@@ -476,7 +476,8 @@ static int send_reply(struct svcxprt_rdma *rdma,
 
 	/* Prepare the SGE for the RPCRDMA Header */
 	ctxt->sge[0].lkey = rdma->sc_pd->local_dma_lkey;
-	ctxt->sge[0].length = svc_rdma_xdr_get_reply_hdr_len(rdma_resp);
+	ctxt->sge[0].length =
+	    svc_rdma_xdr_get_reply_hdr_len((__be32 *)rdma_resp);
 	ctxt->sge[0].addr =
 	    ib_dma_map_page(rdma->sc_cm_id->device, page, 0,
 			    ctxt->sge[0].length, DMA_TO_DEVICE);

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[PATCH v3 1/7] svcrdma: Another sendto chunk list parsing update

[Chuck Lever]

Commit 5fdca6531434 ("svcrdma: Renovate sendto chunk list parsing")
missed a spot. svc_rdma_xdr_get_reply_hdr_len() also assumes the
Write list has only one Write chunk. There's no harm in making this
code more general.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
 include/linux/sunrpc/rpc_rdma.h        |    9 ++++++
 include/linux/sunrpc/svc_rdma.h        |    2 +
 net/sunrpc/xprtrdma/svc_rdma_marshal.c |   49 +++++++++++++++++---------------
 net/sunrpc/xprtrdma/svc_rdma_sendto.c  |    3 +-
 4 files changed, 38 insertions(+), 25 deletions(-)

diff --git a/include/linux/sunrpc/rpc_rdma.h b/include/linux/sunrpc/rpc_rdma.h
index cfda6ad..245fc59 100644
--- a/include/linux/sunrpc/rpc_rdma.h
+++ b/include/linux/sunrpc/rpc_rdma.h
@@ -110,6 +110,15 @@ struct rpcrdma_msg {
 };
 
 /*
+ * XDR sizes, in quads
+ */
+enum {
+	rpcrdma_fixed_maxsz	= 4,
+	rpcrdma_segment_maxsz	= 4,
+	rpcrdma_readchunk_maxsz	= 2 + rpcrdma_segment_maxsz,
+};
+
+/*
  * Smallest RPC/RDMA header: rm_xid through rm_type, then rm_nochunks
  */
 #define RPCRDMA_HDRLEN_MIN	(sizeof(__be32) * 7)
diff --git a/include/linux/sunrpc/svc_rdma.h b/include/linux/sunrpc/svc_rdma.h
index 757fb96..551c518 100644
--- a/include/linux/sunrpc/svc_rdma.h
+++ b/include/linux/sunrpc/svc_rdma.h
@@ -218,7 +218,7 @@ extern void svc_rdma_xdr_encode_reply_header(struct svcxprt_rdma *,
 					     struct rpcrdma_msg *,
 					     struct rpcrdma_msg *,
 					     enum rpcrdma_proc);
-extern int svc_rdma_xdr_get_reply_hdr_len(struct rpcrdma_msg *);
+extern unsigned int svc_rdma_xdr_get_reply_hdr_len(__be32 *rdma_resp);
 
 /* svc_rdma_recvfrom.c */
 extern int svc_rdma_recvfrom(struct svc_rqst *);
diff --git a/net/sunrpc/xprtrdma/svc_rdma_marshal.c b/net/sunrpc/xprtrdma/svc_rdma_marshal.c
index 0ba9887..4e72034 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_marshal.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_marshal.c
@@ -260,32 +260,35 @@ int svc_rdma_xdr_encode_error(struct svcxprt_rdma *xprt,
 	return (int)((unsigned long)va - (unsigned long)startp);
 }
 
-int svc_rdma_xdr_get_reply_hdr_len(struct rpcrdma_msg *rmsgp)
+/**
+ * svc_rdma_xdr_get_reply_hdr_length - Get length of Reply transport header
+ * @rdma_resp: buffer containing Reply transport header
+ *
+ * Returns length of transport header, in bytes.
+ */
+unsigned int svc_rdma_xdr_get_reply_hdr_len(__be32 *rdma_resp)
 {
-	struct rpcrdma_write_array *wr_ary;
+	unsigned int nsegs;
+	__be32 *p;
 
-	/* There is no read-list in a reply */
+	p = rdma_resp;
 
-	/* skip write list */
-	wr_ary = (struct rpcrdma_write_array *)
-		&rmsgp->rm_body.rm_chunks[1];
-	if (wr_ary->wc_discrim)
-		wr_ary = (struct rpcrdma_write_array *)
-			&wr_ary->wc_array[be32_to_cpu(wr_ary->wc_nchunks)].
-			wc_target.rs_length;
-	else
-		wr_ary = (struct rpcrdma_write_array *)
-			&wr_ary->wc_nchunks;
-
-	/* skip reply array */
-	if (wr_ary->wc_discrim)
-		wr_ary = (struct rpcrdma_write_array *)
-			&wr_ary->wc_array[be32_to_cpu(wr_ary->wc_nchunks)];
-	else
-		wr_ary = (struct rpcrdma_write_array *)
-			&wr_ary->wc_nchunks;
-
-	return (unsigned long) wr_ary - (unsigned long) rmsgp;
+	/* RPC-over-RDMA V1 replies never have a Read list. */
+	p += rpcrdma_fixed_maxsz + 1;
+
+	/* Skip Write list. */
+	while (*p++ != xdr_zero) {
+		nsegs = be32_to_cpup(p++);
+		p += nsegs * rpcrdma_segment_maxsz;
+	}
+
+	/* Skip Reply chunk. */
+	if (*p++ != xdr_zero) {
+		nsegs = be32_to_cpup(p++);
+		p += nsegs * rpcrdma_segment_maxsz;
+	}
+
+	return (unsigned long)p - (unsigned long)rdma_resp;
 }
 
 void svc_rdma_xdr_encode_write_list(struct rpcrdma_msg *rmsgp, int chunks)
diff --git a/net/sunrpc/xprtrdma/svc_rdma_sendto.c b/net/sunrpc/xprtrdma/svc_rdma_sendto.c
index ad4d286..ba76f1617 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_sendto.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_sendto.c
@@ -476,7 +476,8 @@ static int send_reply(struct svcxprt_rdma *rdma,
 
 	/* Prepare the SGE for the RPCRDMA Header */
 	ctxt->sge[0].lkey = rdma->sc_pd->local_dma_lkey;
-	ctxt->sge[0].length = svc_rdma_xdr_get_reply_hdr_len(rdma_resp);
+	ctxt->sge[0].length =
+	    svc_rdma_xdr_get_reply_hdr_len((__be32 *)rdma_resp);
 	ctxt->sge[0].addr =
 	    ib_dma_map_page(rdma->sc_cm_id->device, page, 0,
 			    ctxt->sge[0].length, DMA_TO_DEVICE);

[PATCH v3 2/7] svcrdma: Clean up RPC-over-RDMA Reply header encoder

[Chuck Lever]

Replace C structure-based XDR decoding with pointer arithmetic.
Pointer arithmetic is considered more portable, and is used
throughout the kernel's existing XDR encoders. The gcc optimizer
generates similar assembler code either way.

Byte-swapping before a memory store on x86 typically results in an
instruction pipeline stall. Avoid byte-swapping when encoding a new
header.

svcrdma currently doesn't alter a connection's credit grant value
after the connection has been accepted, so it is effectively a
constant. Cache the byte-swapped value in a separate field.

Christoph suggested pulling the header encoding logic into the only
function that uses it.

Signed-off-by: Chuck Lever <chuck.lever-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
---
 include/linux/sunrpc/svc_rdma.h          |    7 ++-----
 net/sunrpc/xprtrdma/svc_rdma_marshal.c   |   18 +-----------------
 net/sunrpc/xprtrdma/svc_rdma_sendto.c    |   19 ++++++++++++-------
 net/sunrpc/xprtrdma/svc_rdma_transport.c |    1 +
 4 files changed, 16 insertions(+), 29 deletions(-)

diff --git a/include/linux/sunrpc/svc_rdma.h b/include/linux/sunrpc/svc_rdma.h
index 551c518..25ecf92 100644
--- a/include/linux/sunrpc/svc_rdma.h
+++ b/include/linux/sunrpc/svc_rdma.h
@@ -141,7 +141,8 @@ struct svcxprt_rdma {
 	atomic_t             sc_sq_avail;	/* SQEs ready to be consumed */
 	unsigned int	     sc_sq_depth;	/* Depth of SQ */
 	unsigned int	     sc_rq_depth;	/* Depth of RQ */
-	u32		     sc_max_requests;	/* Forward credits */
+	__be32		     sc_fc_credits;	/* Forward credits */
+	u32		     sc_max_requests;	/* Max requests */
 	u32		     sc_max_bc_requests;/* Backward credits */
 	int                  sc_max_req_size;	/* Size of each RQ WR buf */
 
@@ -214,10 +215,6 @@ extern int svc_rdma_xdr_encode_error(struct svcxprt_rdma *,
 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);
-extern void svc_rdma_xdr_encode_reply_header(struct svcxprt_rdma *,
-					     struct rpcrdma_msg *,
-					     struct rpcrdma_msg *,
-					     enum rpcrdma_proc);
 extern unsigned int svc_rdma_xdr_get_reply_hdr_len(__be32 *rdma_resp);
 
 /* svc_rdma_recvfrom.c */
diff --git a/net/sunrpc/xprtrdma/svc_rdma_marshal.c b/net/sunrpc/xprtrdma/svc_rdma_marshal.c
index 4e72034..c7d15b1 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_marshal.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_marshal.c
@@ -249,7 +249,7 @@ int svc_rdma_xdr_encode_error(struct svcxprt_rdma *xprt,
 
 	*va++ = rmsgp->rm_xid;
 	*va++ = rmsgp->rm_vers;
-	*va++ = cpu_to_be32(xprt->sc_max_requests);
+	*va++ = xprt->sc_fc_credits;
 	*va++ = rdma_error;
 	*va++ = cpu_to_be32(err);
 	if (err == ERR_VERS) {
@@ -329,19 +329,3 @@ void svc_rdma_xdr_encode_array_chunk(struct rpcrdma_write_array *ary,
 	seg->rs_offset = rs_offset;
 	seg->rs_length = cpu_to_be32(write_len);
 }
-
-void svc_rdma_xdr_encode_reply_header(struct svcxprt_rdma *xprt,
-				  struct rpcrdma_msg *rdma_argp,
-				  struct rpcrdma_msg *rdma_resp,
-				  enum rpcrdma_proc rdma_type)
-{
-	rdma_resp->rm_xid = rdma_argp->rm_xid;
-	rdma_resp->rm_vers = rdma_argp->rm_vers;
-	rdma_resp->rm_credit = cpu_to_be32(xprt->sc_max_requests);
-	rdma_resp->rm_type = cpu_to_be32(rdma_type);
-
-	/* Encode <nul> chunks lists */
-	rdma_resp->rm_body.rm_chunks[0] = xdr_zero;
-	rdma_resp->rm_body.rm_chunks[1] = xdr_zero;
-	rdma_resp->rm_body.rm_chunks[2] = xdr_zero;
-}
diff --git a/net/sunrpc/xprtrdma/svc_rdma_sendto.c b/net/sunrpc/xprtrdma/svc_rdma_sendto.c
index ba76f1617..515221b 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_sendto.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_sendto.c
@@ -560,12 +560,12 @@ int svc_rdma_sendto(struct svc_rqst *rqstp)
 	struct rpcrdma_msg *rdma_argp;
 	struct rpcrdma_msg *rdma_resp;
 	struct rpcrdma_write_array *wr_ary, *rp_ary;
-	enum rpcrdma_proc reply_type;
 	int ret;
 	int inline_bytes;
 	struct page *res_page;
 	struct svc_rdma_req_map *vec;
 	u32 inv_rkey;
+	__be32 *p;
 
 	dprintk("svcrdma: sending response for rqstp=%p\n", rqstp);
 
@@ -597,12 +597,17 @@ int svc_rdma_sendto(struct svc_rqst *rqstp)
 	if (!res_page)
 		goto err0;
 	rdma_resp = page_address(res_page);
-	if (rp_ary)
-		reply_type = RDMA_NOMSG;
-	else
-		reply_type = RDMA_MSG;
-	svc_rdma_xdr_encode_reply_header(rdma, rdma_argp,
-					 rdma_resp, reply_type);
+
+	p = &rdma_resp->rm_xid;
+	*p++ = rdma_argp->rm_xid;
+	*p++ = rdma_argp->rm_vers;
+	*p++ = rdma->sc_fc_credits;
+	*p++ = rp_ary ? rdma_nomsg : rdma_msg;
+
+	/* Start with empty chunks */
+	*p++ = xdr_zero;
+	*p++ = xdr_zero;
+	*p   = xdr_zero;
 
 	/* Send any write-chunk data and build resp write-list */
 	if (wr_ary) {
diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c b/net/sunrpc/xprtrdma/svc_rdma_transport.c
index ca2799a..174928f 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_transport.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c
@@ -1002,6 +1002,7 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
 	newxprt->sc_max_req_size = svcrdma_max_req_size;
 	newxprt->sc_max_requests = min_t(u32, dev->attrs.max_qp_wr,
 					 svcrdma_max_requests);
+	newxprt->sc_fc_credits = cpu_to_be32(newxprt->sc_max_requests);
 	newxprt->sc_max_bc_requests = min_t(u32, dev->attrs.max_qp_wr,
 					    svcrdma_max_bc_requests);
 	newxprt->sc_rq_depth = newxprt->sc_max_requests +

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[PATCH v3 2/7] svcrdma: Clean up RPC-over-RDMA Reply header encoder

[Chuck Lever]

Replace C structure-based XDR decoding with pointer arithmetic.
Pointer arithmetic is considered more portable, and is used
throughout the kernel's existing XDR encoders. The gcc optimizer
generates similar assembler code either way.

Byte-swapping before a memory store on x86 typically results in an
instruction pipeline stall. Avoid byte-swapping when encoding a new
header.

svcrdma currently doesn't alter a connection's credit grant value
after the connection has been accepted, so it is effectively a
constant. Cache the byte-swapped value in a separate field.

Christoph suggested pulling the header encoding logic into the only
function that uses it.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
 include/linux/sunrpc/svc_rdma.h          |    7 ++-----
 net/sunrpc/xprtrdma/svc_rdma_marshal.c   |   18 +-----------------
 net/sunrpc/xprtrdma/svc_rdma_sendto.c    |   19 ++++++++++++-------
 net/sunrpc/xprtrdma/svc_rdma_transport.c |    1 +
 4 files changed, 16 insertions(+), 29 deletions(-)

diff --git a/include/linux/sunrpc/svc_rdma.h b/include/linux/sunrpc/svc_rdma.h
index 551c518..25ecf92 100644
--- a/include/linux/sunrpc/svc_rdma.h
+++ b/include/linux/sunrpc/svc_rdma.h
@@ -141,7 +141,8 @@ struct svcxprt_rdma {
 	atomic_t             sc_sq_avail;	/* SQEs ready to be consumed */
 	unsigned int	     sc_sq_depth;	/* Depth of SQ */
 	unsigned int	     sc_rq_depth;	/* Depth of RQ */
-	u32		     sc_max_requests;	/* Forward credits */
+	__be32		     sc_fc_credits;	/* Forward credits */
+	u32		     sc_max_requests;	/* Max requests */
 	u32		     sc_max_bc_requests;/* Backward credits */
 	int                  sc_max_req_size;	/* Size of each RQ WR buf */
 
@@ -214,10 +215,6 @@ extern int svc_rdma_xdr_encode_error(struct svcxprt_rdma *,
 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);
-extern void svc_rdma_xdr_encode_reply_header(struct svcxprt_rdma *,
-					     struct rpcrdma_msg *,
-					     struct rpcrdma_msg *,
-					     enum rpcrdma_proc);
 extern unsigned int svc_rdma_xdr_get_reply_hdr_len(__be32 *rdma_resp);
 
 /* svc_rdma_recvfrom.c */
diff --git a/net/sunrpc/xprtrdma/svc_rdma_marshal.c b/net/sunrpc/xprtrdma/svc_rdma_marshal.c
index 4e72034..c7d15b1 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_marshal.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_marshal.c
@@ -249,7 +249,7 @@ int svc_rdma_xdr_encode_error(struct svcxprt_rdma *xprt,
 
 	*va++ = rmsgp->rm_xid;
 	*va++ = rmsgp->rm_vers;
-	*va++ = cpu_to_be32(xprt->sc_max_requests);
+	*va++ = xprt->sc_fc_credits;
 	*va++ = rdma_error;
 	*va++ = cpu_to_be32(err);
 	if (err == ERR_VERS) {
@@ -329,19 +329,3 @@ void svc_rdma_xdr_encode_array_chunk(struct rpcrdma_write_array *ary,
 	seg->rs_offset = rs_offset;
 	seg->rs_length = cpu_to_be32(write_len);
 }
-
-void svc_rdma_xdr_encode_reply_header(struct svcxprt_rdma *xprt,
-				  struct rpcrdma_msg *rdma_argp,
-				  struct rpcrdma_msg *rdma_resp,
-				  enum rpcrdma_proc rdma_type)
-{
-	rdma_resp->rm_xid = rdma_argp->rm_xid;
-	rdma_resp->rm_vers = rdma_argp->rm_vers;
-	rdma_resp->rm_credit = cpu_to_be32(xprt->sc_max_requests);
-	rdma_resp->rm_type = cpu_to_be32(rdma_type);
-
-	/* Encode <nul> chunks lists */
-	rdma_resp->rm_body.rm_chunks[0] = xdr_zero;
-	rdma_resp->rm_body.rm_chunks[1] = xdr_zero;
-	rdma_resp->rm_body.rm_chunks[2] = xdr_zero;
-}
diff --git a/net/sunrpc/xprtrdma/svc_rdma_sendto.c b/net/sunrpc/xprtrdma/svc_rdma_sendto.c
index ba76f1617..515221b 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_sendto.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_sendto.c
@@ -560,12 +560,12 @@ int svc_rdma_sendto(struct svc_rqst *rqstp)
 	struct rpcrdma_msg *rdma_argp;
 	struct rpcrdma_msg *rdma_resp;
 	struct rpcrdma_write_array *wr_ary, *rp_ary;
-	enum rpcrdma_proc reply_type;
 	int ret;
 	int inline_bytes;
 	struct page *res_page;
 	struct svc_rdma_req_map *vec;
 	u32 inv_rkey;
+	__be32 *p;
 
 	dprintk("svcrdma: sending response for rqstp=%p\n", rqstp);
 
@@ -597,12 +597,17 @@ int svc_rdma_sendto(struct svc_rqst *rqstp)
 	if (!res_page)
 		goto err0;
 	rdma_resp = page_address(res_page);
-	if (rp_ary)
-		reply_type = RDMA_NOMSG;
-	else
-		reply_type = RDMA_MSG;
-	svc_rdma_xdr_encode_reply_header(rdma, rdma_argp,
-					 rdma_resp, reply_type);
+
+	p = &rdma_resp->rm_xid;
+	*p++ = rdma_argp->rm_xid;
+	*p++ = rdma_argp->rm_vers;
+	*p++ = rdma->sc_fc_credits;
+	*p++ = rp_ary ? rdma_nomsg : rdma_msg;
+
+	/* Start with empty chunks */
+	*p++ = xdr_zero;
+	*p++ = xdr_zero;
+	*p   = xdr_zero;
 
 	/* Send any write-chunk data and build resp write-list */
 	if (wr_ary) {
diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c b/net/sunrpc/xprtrdma/svc_rdma_transport.c
index ca2799a..174928f 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_transport.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c
@@ -1002,6 +1002,7 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
 	newxprt->sc_max_req_size = svcrdma_max_req_size;
 	newxprt->sc_max_requests = min_t(u32, dev->attrs.max_qp_wr,
 					 svcrdma_max_requests);
+	newxprt->sc_fc_credits = cpu_to_be32(newxprt->sc_max_requests);
 	newxprt->sc_max_bc_requests = min_t(u32, dev->attrs.max_qp_wr,
 					    svcrdma_max_bc_requests);
 	newxprt->sc_rq_depth = newxprt->sc_max_requests +

[PATCH v3 3/7] svcrdma: Clean up RPC-over-RDMA Call header decoder

[Chuck Lever]

Replace C structure-based XDR decoding with pointer arithmetic.
Pointer arithmetic is considered more portable.

Rename the "decode" functions. Nothing is decoded here, they
perform only transport header sanity checking. Use existing XDR
naming conventions to help readability.

Straight-line the hot path:
 - relocate the dprintk call sites out of line
 - remove unnecessary byte-swapping
 - reduce count of conditional branches

Deprecate RDMA_MSGP. It's not properly spec'd by RFC5666, and
therefore never used by any V1 client.

Signed-off-by: Chuck Lever <chuck.lever-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
Reviewed-by: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
---
 net/sunrpc/xprtrdma/svc_rdma_marshal.c |  232 +++++++++++---------------------
 1 file changed, 79 insertions(+), 153 deletions(-)

diff --git a/net/sunrpc/xprtrdma/svc_rdma_marshal.c b/net/sunrpc/xprtrdma/svc_rdma_marshal.c
index c7d15b1..1c4aabf 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_marshal.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_marshal.c
@@ -1,4 +1,5 @@
 /*
+ * Copyright (c) 2016 Oracle. All rights reserved.
  * Copyright (c) 2005-2006 Network Appliance, Inc. All rights reserved.
  *
  * This software is available to you under a choice of one of two
@@ -47,102 +48,43 @@
 
 #define RPCDBG_FACILITY	RPCDBG_SVCXPRT
 
-/*
- * Decodes a read chunk list. The expected format is as follows:
- *    descrim  : xdr_one
- *    position : __be32 offset into XDR stream
- *    handle   : __be32 RKEY
- *    . . .
- *  end-of-list: xdr_zero
- */
-static __be32 *decode_read_list(__be32 *va, __be32 *vaend)
+static __be32 *xdr_check_read_list(__be32 *p, __be32 *end)
 {
-	struct rpcrdma_read_chunk *ch = (struct rpcrdma_read_chunk *)va;
+	__be32 *next;
 
-	while (ch->rc_discrim != xdr_zero) {
-		if (((unsigned long)ch + sizeof(struct rpcrdma_read_chunk)) >
-		    (unsigned long)vaend) {
-			dprintk("svcrdma: vaend=%p, ch=%p\n", vaend, ch);
+	while (*p++ != xdr_zero) {
+		next = p + rpcrdma_readchunk_maxsz - 1;
+		if (next > end)
 			return NULL;
-		}
-		ch++;
+		p = next;
 	}
-	return &ch->rc_position;
+	return p;
 }
 
-/*
- * Decodes a write chunk list. The expected format is as follows:
- *    descrim  : xdr_one
- *    nchunks  : <count>
- *       handle   : __be32 RKEY           ---+
- *       length   : __be32 <len of segment>  |
- *       offset   : remove va                + <count>
- *       . . .                               |
- *                                        ---+
- */
-static __be32 *decode_write_list(__be32 *va, __be32 *vaend)
+static __be32 *xdr_check_write_list(__be32 *p, __be32 *end)
 {
-	unsigned long start, end;
-	int nchunks;
-
-	struct rpcrdma_write_array *ary =
-		(struct rpcrdma_write_array *)va;
-
-	/* Check for not write-array */
-	if (ary->wc_discrim == xdr_zero)
-		return &ary->wc_nchunks;
+	__be32 *next;
 
-	if ((unsigned long)ary + sizeof(struct rpcrdma_write_array) >
-	    (unsigned long)vaend) {
-		dprintk("svcrdma: ary=%p, vaend=%p\n", ary, vaend);
-		return NULL;
-	}
-	nchunks = be32_to_cpu(ary->wc_nchunks);
-
-	start = (unsigned long)&ary->wc_array[0];
-	end = (unsigned long)vaend;
-	if (nchunks < 0 ||
-	    nchunks > (SIZE_MAX - start) / sizeof(struct rpcrdma_write_chunk) ||
-	    (start + (sizeof(struct rpcrdma_write_chunk) * nchunks)) > end) {
-		dprintk("svcrdma: ary=%p, wc_nchunks=%d, vaend=%p\n",
-			ary, nchunks, vaend);
-		return NULL;
+	while (*p++ != xdr_zero) {
+		next = p + 1 + be32_to_cpup(p) * rpcrdma_segment_maxsz;
+		if (next > end)
+			return NULL;
+		p = next;
 	}
-	/*
-	 * rs_length is the 2nd 4B field in wc_target and taking its
-	 * address skips the list terminator
-	 */
-	return &ary->wc_array[nchunks].wc_target.rs_length;
+	return p;
 }
 
-static __be32 *decode_reply_array(__be32 *va, __be32 *vaend)
+static __be32 *xdr_check_reply_chunk(__be32 *p, __be32 *end)
 {
-	unsigned long start, end;
-	int nchunks;
-	struct rpcrdma_write_array *ary =
-		(struct rpcrdma_write_array *)va;
-
-	/* Check for no reply-array */
-	if (ary->wc_discrim == xdr_zero)
-		return &ary->wc_nchunks;
-
-	if ((unsigned long)ary + sizeof(struct rpcrdma_write_array) >
-	    (unsigned long)vaend) {
-		dprintk("svcrdma: ary=%p, vaend=%p\n", ary, vaend);
-		return NULL;
-	}
-	nchunks = be32_to_cpu(ary->wc_nchunks);
-
-	start = (unsigned long)&ary->wc_array[0];
-	end = (unsigned long)vaend;
-	if (nchunks < 0 ||
-	    nchunks > (SIZE_MAX - start) / sizeof(struct rpcrdma_write_chunk) ||
-	    (start + (sizeof(struct rpcrdma_write_chunk) * nchunks)) > end) {
-		dprintk("svcrdma: ary=%p, wc_nchunks=%d, vaend=%p\n",
-			ary, nchunks, vaend);
-		return NULL;
+	__be32 *next;
+
+	if (*p++ != xdr_zero) {
+		next = p + 1 + be32_to_cpup(p) * rpcrdma_segment_maxsz;
+		if (next > end)
+			return NULL;
+		p = next;
 	}
-	return (__be32 *)&ary->wc_array[nchunks];
+	return p;
 }
 
 /**
@@ -158,87 +100,71 @@ static __be32 *decode_reply_array(__be32 *va, __be32 *vaend)
  */
 int svc_rdma_xdr_decode_req(struct xdr_buf *rq_arg)
 {
-	struct rpcrdma_msg *rmsgp;
-	__be32 *va, *vaend;
-	unsigned int len;
-	u32 hdr_len;
+	__be32 *p, *end, *rdma_argp;
+	unsigned int hdr_len;
 
 	/* Verify that there's enough bytes for header + something */
-	if (rq_arg->len <= RPCRDMA_HDRLEN_ERR) {
-		dprintk("svcrdma: header too short = %d\n",
-			rq_arg->len);
-		return -EINVAL;
-	}
+	if (rq_arg->len <= RPCRDMA_HDRLEN_ERR)
+		goto out_short;
 
-	rmsgp = (struct rpcrdma_msg *)rq_arg->head[0].iov_base;
-	if (rmsgp->rm_vers != rpcrdma_version) {
-		dprintk("%s: bad version %u\n", __func__,
-			be32_to_cpu(rmsgp->rm_vers));
-		return -EPROTONOSUPPORT;
-	}
+	rdma_argp = rq_arg->head[0].iov_base;
+	if (*(rdma_argp + 1) != rpcrdma_version)
+		goto out_version;
 
-	switch (be32_to_cpu(rmsgp->rm_type)) {
-	case RDMA_MSG:
-	case RDMA_NOMSG:
+	switch (*(rdma_argp + 3)) {
+	case rdma_msg:
+	case rdma_nomsg:
 		break;
 
-	case RDMA_DONE:
-		/* Just drop it */
-		dprintk("svcrdma: dropping RDMA_DONE message\n");
-		return 0;
-
-	case RDMA_ERROR:
-		/* Possible if this is a backchannel reply.
-		 * XXX: We should cancel this XID, though.
-		 */
-		dprintk("svcrdma: dropping RDMA_ERROR message\n");
-		return 0;
-
-	case RDMA_MSGP:
-		/* Pull in the extra for the padded case, bump our pointer */
-		rmsgp->rm_body.rm_padded.rm_align =
-			be32_to_cpu(rmsgp->rm_body.rm_padded.rm_align);
-		rmsgp->rm_body.rm_padded.rm_thresh =
-			be32_to_cpu(rmsgp->rm_body.rm_padded.rm_thresh);
-
-		va = &rmsgp->rm_body.rm_padded.rm_pempty[4];
-		rq_arg->head[0].iov_base = va;
-		len = (u32)((unsigned long)va - (unsigned long)rmsgp);
-		rq_arg->head[0].iov_len -= len;
-		if (len > rq_arg->len)
-			return -EINVAL;
-		return len;
-	default:
-		dprintk("svcrdma: bad rdma procedure (%u)\n",
-			be32_to_cpu(rmsgp->rm_type));
-		return -EINVAL;
-	}
+	case rdma_done:
+		goto out_drop;
 
-	/* The chunk list may contain either a read chunk list or a write
-	 * chunk list and a reply chunk list.
-	 */
-	va = &rmsgp->rm_body.rm_chunks[0];
-	vaend = (__be32 *)((unsigned long)rmsgp + rq_arg->len);
-	va = decode_read_list(va, vaend);
-	if (!va) {
-		dprintk("svcrdma: failed to decode read list\n");
-		return -EINVAL;
-	}
-	va = decode_write_list(va, vaend);
-	if (!va) {
-		dprintk("svcrdma: failed to decode write list\n");
-		return -EINVAL;
-	}
-	va = decode_reply_array(va, vaend);
-	if (!va) {
-		dprintk("svcrdma: failed to decode reply chunk\n");
-		return -EINVAL;
+	case rdma_error:
+		goto out_drop;
+
+	default:
+		goto out_proc;
 	}
 
-	rq_arg->head[0].iov_base = va;
-	hdr_len = (unsigned long)va - (unsigned long)rmsgp;
+	end = (__be32 *)((unsigned long)rdma_argp + rq_arg->len);
+	p = xdr_check_read_list(rdma_argp + 4, end);
+	if (!p)
+		goto out_inval;
+	p = xdr_check_write_list(p, end);
+	if (!p)
+		goto out_inval;
+	p = xdr_check_reply_chunk(p, end);
+	if (!p)
+		goto out_inval;
+	if (p > end)
+		goto out_inval;
+
+	rq_arg->head[0].iov_base = p;
+	hdr_len = (unsigned long)p - (unsigned long)rdma_argp;
 	rq_arg->head[0].iov_len -= hdr_len;
 	return hdr_len;
+
+out_short:
+	dprintk("svcrdma: header too short = %d\n", rq_arg->len);
+	return -EINVAL;
+
+out_version:
+	dprintk("svcrdma: bad xprt version: %u\n",
+		be32_to_cpup(rdma_argp + 1));
+	return -EPROTONOSUPPORT;
+
+out_drop:
+	dprintk("svcrdma: dropping RDMA_DONE/ERROR message\n");
+	return 0;
+
+out_proc:
+	dprintk("svcrdma: bad rdma procedure (%u)\n",
+		be32_to_cpup(rdma_argp + 3));
+	return -EINVAL;
+
+out_inval:
+	dprintk("svcrdma: failed to parse transport header\n");
+	return -EINVAL;
 }
 
 int svc_rdma_xdr_encode_error(struct svcxprt_rdma *xprt,

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[PATCH v3 3/7] svcrdma: Clean up RPC-over-RDMA Call header decoder

[Chuck Lever]

Replace C structure-based XDR decoding with pointer arithmetic.
Pointer arithmetic is considered more portable.

Rename the "decode" functions. Nothing is decoded here, they
perform only transport header sanity checking. Use existing XDR
naming conventions to help readability.

Straight-line the hot path:
 - relocate the dprintk call sites out of line
 - remove unnecessary byte-swapping
 - reduce count of conditional branches

Deprecate RDMA_MSGP. It's not properly spec'd by RFC5666, and
therefore never used by any V1 client.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
 net/sunrpc/xprtrdma/svc_rdma_marshal.c |  232 +++++++++++---------------------
 1 file changed, 79 insertions(+), 153 deletions(-)

diff --git a/net/sunrpc/xprtrdma/svc_rdma_marshal.c b/net/sunrpc/xprtrdma/svc_rdma_marshal.c
index c7d15b1..1c4aabf 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_marshal.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_marshal.c
@@ -1,4 +1,5 @@
 /*
+ * Copyright (c) 2016 Oracle. All rights reserved.
  * Copyright (c) 2005-2006 Network Appliance, Inc. All rights reserved.
  *
  * This software is available to you under a choice of one of two
@@ -47,102 +48,43 @@
 
 #define RPCDBG_FACILITY	RPCDBG_SVCXPRT
 
-/*
- * Decodes a read chunk list. The expected format is as follows:
- *    descrim  : xdr_one
- *    position : __be32 offset into XDR stream
- *    handle   : __be32 RKEY
- *    . . .
- *  end-of-list: xdr_zero
- */
-static __be32 *decode_read_list(__be32 *va, __be32 *vaend)
+static __be32 *xdr_check_read_list(__be32 *p, __be32 *end)
 {
-	struct rpcrdma_read_chunk *ch = (struct rpcrdma_read_chunk *)va;
+	__be32 *next;
 
-	while (ch->rc_discrim != xdr_zero) {
-		if (((unsigned long)ch + sizeof(struct rpcrdma_read_chunk)) >
-		    (unsigned long)vaend) {
-			dprintk("svcrdma: vaend=%p, ch=%p\n", vaend, ch);
+	while (*p++ != xdr_zero) {
+		next = p + rpcrdma_readchunk_maxsz - 1;
+		if (next > end)
 			return NULL;
-		}
-		ch++;
+		p = next;
 	}
-	return &ch->rc_position;
+	return p;
 }
 
-/*
- * Decodes a write chunk list. The expected format is as follows:
- *    descrim  : xdr_one
- *    nchunks  : <count>
- *       handle   : __be32 RKEY           ---+
- *       length   : __be32 <len of segment>  |
- *       offset   : remove va                + <count>
- *       . . .                               |
- *                                        ---+
- */
-static __be32 *decode_write_list(__be32 *va, __be32 *vaend)
+static __be32 *xdr_check_write_list(__be32 *p, __be32 *end)
 {
-	unsigned long start, end;
-	int nchunks;
-
-	struct rpcrdma_write_array *ary =
-		(struct rpcrdma_write_array *)va;
-
-	/* Check for not write-array */
-	if (ary->wc_discrim == xdr_zero)
-		return &ary->wc_nchunks;
+	__be32 *next;
 
-	if ((unsigned long)ary + sizeof(struct rpcrdma_write_array) >
-	    (unsigned long)vaend) {
-		dprintk("svcrdma: ary=%p, vaend=%p\n", ary, vaend);
-		return NULL;
-	}
-	nchunks = be32_to_cpu(ary->wc_nchunks);
-
-	start = (unsigned long)&ary->wc_array[0];
-	end = (unsigned long)vaend;
-	if (nchunks < 0 ||
-	    nchunks > (SIZE_MAX - start) / sizeof(struct rpcrdma_write_chunk) ||
-	    (start + (sizeof(struct rpcrdma_write_chunk) * nchunks)) > end) {
-		dprintk("svcrdma: ary=%p, wc_nchunks=%d, vaend=%p\n",
-			ary, nchunks, vaend);
-		return NULL;
+	while (*p++ != xdr_zero) {
+		next = p + 1 + be32_to_cpup(p) * rpcrdma_segment_maxsz;
+		if (next > end)
+			return NULL;
+		p = next;
 	}
-	/*
-	 * rs_length is the 2nd 4B field in wc_target and taking its
-	 * address skips the list terminator
-	 */
-	return &ary->wc_array[nchunks].wc_target.rs_length;
+	return p;
 }
 
-static __be32 *decode_reply_array(__be32 *va, __be32 *vaend)
+static __be32 *xdr_check_reply_chunk(__be32 *p, __be32 *end)
 {
-	unsigned long start, end;
-	int nchunks;
-	struct rpcrdma_write_array *ary =
-		(struct rpcrdma_write_array *)va;
-
-	/* Check for no reply-array */
-	if (ary->wc_discrim == xdr_zero)
-		return &ary->wc_nchunks;
-
-	if ((unsigned long)ary + sizeof(struct rpcrdma_write_array) >
-	    (unsigned long)vaend) {
-		dprintk("svcrdma: ary=%p, vaend=%p\n", ary, vaend);
-		return NULL;
-	}
-	nchunks = be32_to_cpu(ary->wc_nchunks);
-
-	start = (unsigned long)&ary->wc_array[0];
-	end = (unsigned long)vaend;
-	if (nchunks < 0 ||
-	    nchunks > (SIZE_MAX - start) / sizeof(struct rpcrdma_write_chunk) ||
-	    (start + (sizeof(struct rpcrdma_write_chunk) * nchunks)) > end) {
-		dprintk("svcrdma: ary=%p, wc_nchunks=%d, vaend=%p\n",
-			ary, nchunks, vaend);
-		return NULL;
+	__be32 *next;
+
+	if (*p++ != xdr_zero) {
+		next = p + 1 + be32_to_cpup(p) * rpcrdma_segment_maxsz;
+		if (next > end)
+			return NULL;
+		p = next;
 	}
-	return (__be32 *)&ary->wc_array[nchunks];
+	return p;
 }
 
 /**
@@ -158,87 +100,71 @@ static __be32 *decode_reply_array(__be32 *va, __be32 *vaend)
  */
 int svc_rdma_xdr_decode_req(struct xdr_buf *rq_arg)
 {
-	struct rpcrdma_msg *rmsgp;
-	__be32 *va, *vaend;
-	unsigned int len;
-	u32 hdr_len;
+	__be32 *p, *end, *rdma_argp;
+	unsigned int hdr_len;
 
 	/* Verify that there's enough bytes for header + something */
-	if (rq_arg->len <= RPCRDMA_HDRLEN_ERR) {
-		dprintk("svcrdma: header too short = %d\n",
-			rq_arg->len);
-		return -EINVAL;
-	}
+	if (rq_arg->len <= RPCRDMA_HDRLEN_ERR)
+		goto out_short;
 
-	rmsgp = (struct rpcrdma_msg *)rq_arg->head[0].iov_base;
-	if (rmsgp->rm_vers != rpcrdma_version) {
-		dprintk("%s: bad version %u\n", __func__,
-			be32_to_cpu(rmsgp->rm_vers));
-		return -EPROTONOSUPPORT;
-	}
+	rdma_argp = rq_arg->head[0].iov_base;
+	if (*(rdma_argp + 1) != rpcrdma_version)
+		goto out_version;
 
-	switch (be32_to_cpu(rmsgp->rm_type)) {
-	case RDMA_MSG:
-	case RDMA_NOMSG:
+	switch (*(rdma_argp + 3)) {
+	case rdma_msg:
+	case rdma_nomsg:
 		break;
 
-	case RDMA_DONE:
-		/* Just drop it */
-		dprintk("svcrdma: dropping RDMA_DONE message\n");
-		return 0;
-
-	case RDMA_ERROR:
-		/* Possible if this is a backchannel reply.
-		 * XXX: We should cancel this XID, though.
-		 */
-		dprintk("svcrdma: dropping RDMA_ERROR message\n");
-		return 0;
-
-	case RDMA_MSGP:
-		/* Pull in the extra for the padded case, bump our pointer */
-		rmsgp->rm_body.rm_padded.rm_align =
-			be32_to_cpu(rmsgp->rm_body.rm_padded.rm_align);
-		rmsgp->rm_body.rm_padded.rm_thresh =
-			be32_to_cpu(rmsgp->rm_body.rm_padded.rm_thresh);
-
-		va = &rmsgp->rm_body.rm_padded.rm_pempty[4];
-		rq_arg->head[0].iov_base = va;
-		len = (u32)((unsigned long)va - (unsigned long)rmsgp);
-		rq_arg->head[0].iov_len -= len;
-		if (len > rq_arg->len)
-			return -EINVAL;
-		return len;
-	default:
-		dprintk("svcrdma: bad rdma procedure (%u)\n",
-			be32_to_cpu(rmsgp->rm_type));
-		return -EINVAL;
-	}
+	case rdma_done:
+		goto out_drop;
 
-	/* The chunk list may contain either a read chunk list or a write
-	 * chunk list and a reply chunk list.
-	 */
-	va = &rmsgp->rm_body.rm_chunks[0];
-	vaend = (__be32 *)((unsigned long)rmsgp + rq_arg->len);
-	va = decode_read_list(va, vaend);
-	if (!va) {
-		dprintk("svcrdma: failed to decode read list\n");
-		return -EINVAL;
-	}
-	va = decode_write_list(va, vaend);
-	if (!va) {
-		dprintk("svcrdma: failed to decode write list\n");
-		return -EINVAL;
-	}
-	va = decode_reply_array(va, vaend);
-	if (!va) {
-		dprintk("svcrdma: failed to decode reply chunk\n");
-		return -EINVAL;
+	case rdma_error:
+		goto out_drop;
+
+	default:
+		goto out_proc;
 	}
 
-	rq_arg->head[0].iov_base = va;
-	hdr_len = (unsigned long)va - (unsigned long)rmsgp;
+	end = (__be32 *)((unsigned long)rdma_argp + rq_arg->len);
+	p = xdr_check_read_list(rdma_argp + 4, end);
+	if (!p)
+		goto out_inval;
+	p = xdr_check_write_list(p, end);
+	if (!p)
+		goto out_inval;
+	p = xdr_check_reply_chunk(p, end);
+	if (!p)
+		goto out_inval;
+	if (p > end)
+		goto out_inval;
+
+	rq_arg->head[0].iov_base = p;
+	hdr_len = (unsigned long)p - (unsigned long)rdma_argp;
 	rq_arg->head[0].iov_len -= hdr_len;
 	return hdr_len;
+
+out_short:
+	dprintk("svcrdma: header too short = %d\n", rq_arg->len);
+	return -EINVAL;
+
+out_version:
+	dprintk("svcrdma: bad xprt version: %u\n",
+		be32_to_cpup(rdma_argp + 1));
+	return -EPROTONOSUPPORT;
+
+out_drop:
+	dprintk("svcrdma: dropping RDMA_DONE/ERROR message\n");
+	return 0;
+
+out_proc:
+	dprintk("svcrdma: bad rdma procedure (%u)\n",
+		be32_to_cpup(rdma_argp + 3));
+	return -EINVAL;
+
+out_inval:
+	dprintk("svcrdma: failed to parse transport header\n");
+	return -EINVAL;
 }
 
 int svc_rdma_xdr_encode_error(struct svcxprt_rdma *xprt,

[PATCH v3 4/7] svcrdma: Clean up backchannel send header encoding

[Chuck Lever]

Replace C structure-based XDR decoding with pointer arithmetic.
Pointer arithmetic is considered more portable.

Signed-off-by: Chuck Lever <chuck.lever-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
Reviewed-by: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
---
 net/sunrpc/xprtrdma/svc_rdma_backchannel.c |   17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/net/sunrpc/xprtrdma/svc_rdma_backchannel.c b/net/sunrpc/xprtrdma/svc_rdma_backchannel.c
index 288e35c..b1bc7a7 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_backchannel.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_backchannel.c
@@ -200,19 +200,20 @@ static int svc_rdma_bc_sendto(struct svcxprt_rdma *rdma,
 {
 	struct rpc_xprt *xprt = rqst->rq_xprt;
 	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
-	struct rpcrdma_msg *headerp = (struct rpcrdma_msg *)rqst->rq_buffer;
+	__be32 *p;
 	int rc;
 
 	/* Space in the send buffer for an RPC/RDMA header is reserved
 	 * via xprt->tsh_size.
 	 */
-	headerp->rm_xid = rqst->rq_xid;
-	headerp->rm_vers = rpcrdma_version;
-	headerp->rm_credit = cpu_to_be32(r_xprt->rx_buf.rb_bc_max_requests);
-	headerp->rm_type = rdma_msg;
-	headerp->rm_body.rm_chunks[0] = xdr_zero;
-	headerp->rm_body.rm_chunks[1] = xdr_zero;
-	headerp->rm_body.rm_chunks[2] = xdr_zero;
+	p = rqst->rq_buffer;
+	*p++ = rqst->rq_xid;
+	*p++ = rpcrdma_version;
+	*p++ = cpu_to_be32(r_xprt->rx_buf.rb_bc_max_requests);
+	*p++ = rdma_msg;
+	*p++ = xdr_zero;
+	*p++ = xdr_zero;
+	*p   = xdr_zero;
 
 #ifdef SVCRDMA_BACKCHANNEL_DEBUG
 	pr_info("%s: %*ph\n", __func__, 64, rqst->rq_buffer);

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[PATCH v3 4/7] svcrdma: Clean up backchannel send header encoding

[Chuck Lever]

Replace C structure-based XDR decoding with pointer arithmetic.
Pointer arithmetic is considered more portable.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
 net/sunrpc/xprtrdma/svc_rdma_backchannel.c |   17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/net/sunrpc/xprtrdma/svc_rdma_backchannel.c b/net/sunrpc/xprtrdma/svc_rdma_backchannel.c
index 288e35c..b1bc7a7 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_backchannel.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_backchannel.c
@@ -200,19 +200,20 @@ static int svc_rdma_bc_sendto(struct svcxprt_rdma *rdma,
 {
 	struct rpc_xprt *xprt = rqst->rq_xprt;
 	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
-	struct rpcrdma_msg *headerp = (struct rpcrdma_msg *)rqst->rq_buffer;
+	__be32 *p;
 	int rc;
 
 	/* Space in the send buffer for an RPC/RDMA header is reserved
 	 * via xprt->tsh_size.
 	 */
-	headerp->rm_xid = rqst->rq_xid;
-	headerp->rm_vers = rpcrdma_version;
-	headerp->rm_credit = cpu_to_be32(r_xprt->rx_buf.rb_bc_max_requests);
-	headerp->rm_type = rdma_msg;
-	headerp->rm_body.rm_chunks[0] = xdr_zero;
-	headerp->rm_body.rm_chunks[1] = xdr_zero;
-	headerp->rm_body.rm_chunks[2] = xdr_zero;
+	p = rqst->rq_buffer;
+	*p++ = rqst->rq_xid;
+	*p++ = rpcrdma_version;
+	*p++ = cpu_to_be32(r_xprt->rx_buf.rb_bc_max_requests);
+	*p++ = rdma_msg;
+	*p++ = xdr_zero;
+	*p++ = xdr_zero;
+	*p   = xdr_zero;
 
 #ifdef SVCRDMA_BACKCHANNEL_DEBUG
 	pr_info("%s: %*ph\n", __func__, 64, rqst->rq_buffer);

[PATCH v3 5/7] svcrdma: Remove unused sc_dto_q field

[Chuck Lever]

Clean up. Commit be99bb11400c ("svcrdma: Use new CQ API for
RPC-over-RDMA server send CQs") removed code that used the sc_dto_q
field, but neglected to remove sc_dto_q at the same time.

Fixes: be99bb11400c ("svcrdma: Use new CQ API for RPC-over- ...")
Signed-off-by: Chuck Lever <chuck.lever-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
Reviewed-by: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
---
 include/linux/sunrpc/svc_rdma.h          |    1 -
 net/sunrpc/xprtrdma/svc_rdma_transport.c |    1 -
 2 files changed, 2 deletions(-)

diff --git a/include/linux/sunrpc/svc_rdma.h b/include/linux/sunrpc/svc_rdma.h
index 25ecf92..f77a7bc 100644
--- a/include/linux/sunrpc/svc_rdma.h
+++ b/include/linux/sunrpc/svc_rdma.h
@@ -172,7 +172,6 @@ struct svcxprt_rdma {
 
 	wait_queue_head_t    sc_send_wait;	/* SQ exhaustion waitlist */
 	unsigned long	     sc_flags;
-	struct list_head     sc_dto_q;		/* DTO tasklet I/O pending Q */
 	struct list_head     sc_read_complete_q;
 	struct work_struct   sc_work;
 };
diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c b/net/sunrpc/xprtrdma/svc_rdma_transport.c
index 174928f..023eaa0 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_transport.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c
@@ -557,7 +557,6 @@ static struct svcxprt_rdma *rdma_create_xprt(struct svc_serv *serv,
 		return NULL;
 	svc_xprt_init(&init_net, &svc_rdma_class, &cma_xprt->sc_xprt, serv);
 	INIT_LIST_HEAD(&cma_xprt->sc_accept_q);
-	INIT_LIST_HEAD(&cma_xprt->sc_dto_q);
 	INIT_LIST_HEAD(&cma_xprt->sc_rq_dto_q);
 	INIT_LIST_HEAD(&cma_xprt->sc_read_complete_q);
 	INIT_LIST_HEAD(&cma_xprt->sc_frmr_q);

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[PATCH v3 5/7] svcrdma: Remove unused sc_dto_q field

[Chuck Lever]

Clean up. Commit be99bb11400c ("svcrdma: Use new CQ API for
RPC-over-RDMA server send CQs") removed code that used the sc_dto_q
field, but neglected to remove sc_dto_q at the same time.

Fixes: be99bb11400c ("svcrdma: Use new CQ API for RPC-over- ...")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
 include/linux/sunrpc/svc_rdma.h          |    1 -
 net/sunrpc/xprtrdma/svc_rdma_transport.c |    1 -
 2 files changed, 2 deletions(-)

diff --git a/include/linux/sunrpc/svc_rdma.h b/include/linux/sunrpc/svc_rdma.h
index 25ecf92..f77a7bc 100644
--- a/include/linux/sunrpc/svc_rdma.h
+++ b/include/linux/sunrpc/svc_rdma.h
@@ -172,7 +172,6 @@ struct svcxprt_rdma {
 
 	wait_queue_head_t    sc_send_wait;	/* SQ exhaustion waitlist */
 	unsigned long	     sc_flags;
-	struct list_head     sc_dto_q;		/* DTO tasklet I/O pending Q */
 	struct list_head     sc_read_complete_q;
 	struct work_struct   sc_work;
 };
diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c b/net/sunrpc/xprtrdma/svc_rdma_transport.c
index 174928f..023eaa0 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_transport.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c
@@ -557,7 +557,6 @@ static struct svcxprt_rdma *rdma_create_xprt(struct svc_serv *serv,
 		return NULL;
 	svc_xprt_init(&init_net, &svc_rdma_class, &cma_xprt->sc_xprt, serv);
 	INIT_LIST_HEAD(&cma_xprt->sc_accept_q);
-	INIT_LIST_HEAD(&cma_xprt->sc_dto_q);
 	INIT_LIST_HEAD(&cma_xprt->sc_rq_dto_q);
 	INIT_LIST_HEAD(&cma_xprt->sc_read_complete_q);
 	INIT_LIST_HEAD(&cma_xprt->sc_frmr_q);

[PATCH v3 6/7] svcrdma: Combine list fields in struct svc_rdma_op_ctxt

[Chuck Lever]

Clean up: The free list and the dto_q list fields are never used at
the same time. Reduce the size of struct svc_rdma_op_ctxt by
combining these fields.

Signed-off-by: Chuck Lever <chuck.lever-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
Reviewed-by: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
---
 include/linux/sunrpc/svc_rdma.h          |    3 +--
 net/sunrpc/xprtrdma/svc_rdma_recvfrom.c  |   14 +++++--------
 net/sunrpc/xprtrdma/svc_rdma_transport.c |   33 ++++++++++++++----------------
 3 files changed, 22 insertions(+), 28 deletions(-)

diff --git a/include/linux/sunrpc/svc_rdma.h b/include/linux/sunrpc/svc_rdma.h
index f77a7bc..b105f73 100644
--- a/include/linux/sunrpc/svc_rdma.h
+++ b/include/linux/sunrpc/svc_rdma.h
@@ -70,7 +70,7 @@
  * completes.
  */
 struct svc_rdma_op_ctxt {
-	struct list_head free;
+	struct list_head list;
 	struct svc_rdma_op_ctxt *read_hdr;
 	struct svc_rdma_fastreg_mr *frmr;
 	int hdr_count;
@@ -78,7 +78,6 @@ struct svc_rdma_op_ctxt {
 	struct ib_cqe cqe;
 	struct ib_cqe reg_cqe;
 	struct ib_cqe inv_cqe;
-	struct list_head dto_q;
 	u32 byte_len;
 	u32 position;
 	struct svcxprt_rdma *xprt;
diff --git a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
index 172b537..b9ccd73 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
@@ -608,18 +608,16 @@ int svc_rdma_recvfrom(struct svc_rqst *rqstp)
 
 	spin_lock_bh(&rdma_xprt->sc_rq_dto_lock);
 	if (!list_empty(&rdma_xprt->sc_read_complete_q)) {
-		ctxt = list_entry(rdma_xprt->sc_read_complete_q.next,
-				  struct svc_rdma_op_ctxt,
-				  dto_q);
-		list_del_init(&ctxt->dto_q);
+		ctxt = list_first_entry(&rdma_xprt->sc_read_complete_q,
+					struct svc_rdma_op_ctxt, list);
+		list_del(&ctxt->list);
 		spin_unlock_bh(&rdma_xprt->sc_rq_dto_lock);
 		rdma_read_complete(rqstp, ctxt);
 		goto complete;
 	} else if (!list_empty(&rdma_xprt->sc_rq_dto_q)) {
-		ctxt = list_entry(rdma_xprt->sc_rq_dto_q.next,
-				  struct svc_rdma_op_ctxt,
-				  dto_q);
-		list_del_init(&ctxt->dto_q);
+		ctxt = list_first_entry(&rdma_xprt->sc_rq_dto_q,
+					struct svc_rdma_op_ctxt, list);
+		list_del(&ctxt->list);
 	} else {
 		atomic_inc(&rdma_stat_rq_starve);
 		clear_bit(XPT_DATA, &xprt->xpt_flags);
diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c b/net/sunrpc/xprtrdma/svc_rdma_transport.c
index 023eaa0..87b8b5a 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_transport.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c
@@ -157,8 +157,7 @@ static struct svc_rdma_op_ctxt *alloc_ctxt(struct svcxprt_rdma *xprt,
 	ctxt = kmalloc(sizeof(*ctxt), flags);
 	if (ctxt) {
 		ctxt->xprt = xprt;
-		INIT_LIST_HEAD(&ctxt->free);
-		INIT_LIST_HEAD(&ctxt->dto_q);
+		INIT_LIST_HEAD(&ctxt->list);
 	}
 	return ctxt;
 }
@@ -180,7 +179,7 @@ static bool svc_rdma_prealloc_ctxts(struct svcxprt_rdma *xprt)
 			dprintk("svcrdma: No memory for RDMA ctxt\n");
 			return false;
 		}
-		list_add(&ctxt->free, &xprt->sc_ctxts);
+		list_add(&ctxt->list, &xprt->sc_ctxts);
 	}
 	return true;
 }
@@ -195,8 +194,8 @@ struct svc_rdma_op_ctxt *svc_rdma_get_context(struct svcxprt_rdma *xprt)
 		goto out_empty;
 
 	ctxt = list_first_entry(&xprt->sc_ctxts,
-				struct svc_rdma_op_ctxt, free);
-	list_del_init(&ctxt->free);
+				struct svc_rdma_op_ctxt, list);
+	list_del(&ctxt->list);
 	spin_unlock_bh(&xprt->sc_ctxt_lock);
 
 out:
@@ -256,7 +255,7 @@ void svc_rdma_put_context(struct svc_rdma_op_ctxt *ctxt, int free_pages)
 
 	spin_lock_bh(&xprt->sc_ctxt_lock);
 	xprt->sc_ctxt_used--;
-	list_add(&ctxt->free, &xprt->sc_ctxts);
+	list_add(&ctxt->list, &xprt->sc_ctxts);
 	spin_unlock_bh(&xprt->sc_ctxt_lock);
 }
 
@@ -266,8 +265,8 @@ static void svc_rdma_destroy_ctxts(struct svcxprt_rdma *xprt)
 		struct svc_rdma_op_ctxt *ctxt;
 
 		ctxt = list_first_entry(&xprt->sc_ctxts,
-					struct svc_rdma_op_ctxt, free);
-		list_del(&ctxt->free);
+					struct svc_rdma_op_ctxt, list);
+		list_del(&ctxt->list);
 		kfree(ctxt);
 	}
 }
@@ -404,7 +403,7 @@ static void svc_rdma_wc_receive(struct ib_cq *cq, struct ib_wc *wc)
 	/* All wc fields are now known to be valid */
 	ctxt->byte_len = wc->byte_len;
 	spin_lock(&xprt->sc_rq_dto_lock);
-	list_add_tail(&ctxt->dto_q, &xprt->sc_rq_dto_q);
+	list_add_tail(&ctxt->list, &xprt->sc_rq_dto_q);
 	spin_unlock(&xprt->sc_rq_dto_lock);
 
 	set_bit(XPT_DATA, &xprt->sc_xprt.xpt_flags);
@@ -525,7 +524,7 @@ void svc_rdma_wc_read(struct ib_cq *cq, struct ib_wc *wc)
 
 		read_hdr = ctxt->read_hdr;
 		spin_lock(&xprt->sc_rq_dto_lock);
-		list_add_tail(&read_hdr->dto_q,
+		list_add_tail(&read_hdr->list,
 			      &xprt->sc_read_complete_q);
 		spin_unlock(&xprt->sc_rq_dto_lock);
 
@@ -1213,20 +1212,18 @@ static void __svc_rdma_free(struct work_struct *work)
 	 */
 	while (!list_empty(&rdma->sc_read_complete_q)) {
 		struct svc_rdma_op_ctxt *ctxt;
-		ctxt = list_entry(rdma->sc_read_complete_q.next,
-				  struct svc_rdma_op_ctxt,
-				  dto_q);
-		list_del_init(&ctxt->dto_q);
+		ctxt = list_first_entry(&rdma->sc_read_complete_q,
+					struct svc_rdma_op_ctxt, list);
+		list_del(&ctxt->list);
 		svc_rdma_put_context(ctxt, 1);
 	}
 
 	/* Destroy queued, but not processed recv completions */
 	while (!list_empty(&rdma->sc_rq_dto_q)) {
 		struct svc_rdma_op_ctxt *ctxt;
-		ctxt = list_entry(rdma->sc_rq_dto_q.next,
-				  struct svc_rdma_op_ctxt,
-				  dto_q);
-		list_del_init(&ctxt->dto_q);
+		ctxt = list_first_entry(&rdma->sc_rq_dto_q,
+					struct svc_rdma_op_ctxt, list);
+		list_del(&ctxt->list);
 		svc_rdma_put_context(ctxt, 1);
 	}
 

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[PATCH v3 6/7] svcrdma: Combine list fields in struct svc_rdma_op_ctxt

[Chuck Lever]

Clean up: The free list and the dto_q list fields are never used at
the same time. Reduce the size of struct svc_rdma_op_ctxt by
combining these fields.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
 include/linux/sunrpc/svc_rdma.h          |    3 +--
 net/sunrpc/xprtrdma/svc_rdma_recvfrom.c  |   14 +++++--------
 net/sunrpc/xprtrdma/svc_rdma_transport.c |   33 ++++++++++++++----------------
 3 files changed, 22 insertions(+), 28 deletions(-)

diff --git a/include/linux/sunrpc/svc_rdma.h b/include/linux/sunrpc/svc_rdma.h
index f77a7bc..b105f73 100644
--- a/include/linux/sunrpc/svc_rdma.h
+++ b/include/linux/sunrpc/svc_rdma.h
@@ -70,7 +70,7 @@
  * completes.
  */
 struct svc_rdma_op_ctxt {
-	struct list_head free;
+	struct list_head list;
 	struct svc_rdma_op_ctxt *read_hdr;
 	struct svc_rdma_fastreg_mr *frmr;
 	int hdr_count;
@@ -78,7 +78,6 @@ struct svc_rdma_op_ctxt {
 	struct ib_cqe cqe;
 	struct ib_cqe reg_cqe;
 	struct ib_cqe inv_cqe;
-	struct list_head dto_q;
 	u32 byte_len;
 	u32 position;
 	struct svcxprt_rdma *xprt;
diff --git a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
index 172b537..b9ccd73 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
@@ -608,18 +608,16 @@ int svc_rdma_recvfrom(struct svc_rqst *rqstp)
 
 	spin_lock_bh(&rdma_xprt->sc_rq_dto_lock);
 	if (!list_empty(&rdma_xprt->sc_read_complete_q)) {
-		ctxt = list_entry(rdma_xprt->sc_read_complete_q.next,
-				  struct svc_rdma_op_ctxt,
-				  dto_q);
-		list_del_init(&ctxt->dto_q);
+		ctxt = list_first_entry(&rdma_xprt->sc_read_complete_q,
+					struct svc_rdma_op_ctxt, list);
+		list_del(&ctxt->list);
 		spin_unlock_bh(&rdma_xprt->sc_rq_dto_lock);
 		rdma_read_complete(rqstp, ctxt);
 		goto complete;
 	} else if (!list_empty(&rdma_xprt->sc_rq_dto_q)) {
-		ctxt = list_entry(rdma_xprt->sc_rq_dto_q.next,
-				  struct svc_rdma_op_ctxt,
-				  dto_q);
-		list_del_init(&ctxt->dto_q);
+		ctxt = list_first_entry(&rdma_xprt->sc_rq_dto_q,
+					struct svc_rdma_op_ctxt, list);
+		list_del(&ctxt->list);
 	} else {
 		atomic_inc(&rdma_stat_rq_starve);
 		clear_bit(XPT_DATA, &xprt->xpt_flags);
diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c b/net/sunrpc/xprtrdma/svc_rdma_transport.c
index 023eaa0..87b8b5a 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_transport.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c
@@ -157,8 +157,7 @@ static struct svc_rdma_op_ctxt *alloc_ctxt(struct svcxprt_rdma *xprt,
 	ctxt = kmalloc(sizeof(*ctxt), flags);
 	if (ctxt) {
 		ctxt->xprt = xprt;
-		INIT_LIST_HEAD(&ctxt->free);
-		INIT_LIST_HEAD(&ctxt->dto_q);
+		INIT_LIST_HEAD(&ctxt->list);
 	}
 	return ctxt;
 }
@@ -180,7 +179,7 @@ static bool svc_rdma_prealloc_ctxts(struct svcxprt_rdma *xprt)
 			dprintk("svcrdma: No memory for RDMA ctxt\n");
 			return false;
 		}
-		list_add(&ctxt->free, &xprt->sc_ctxts);
+		list_add(&ctxt->list, &xprt->sc_ctxts);
 	}
 	return true;
 }
@@ -195,8 +194,8 @@ struct svc_rdma_op_ctxt *svc_rdma_get_context(struct svcxprt_rdma *xprt)
 		goto out_empty;
 
 	ctxt = list_first_entry(&xprt->sc_ctxts,
-				struct svc_rdma_op_ctxt, free);
-	list_del_init(&ctxt->free);
+				struct svc_rdma_op_ctxt, list);
+	list_del(&ctxt->list);
 	spin_unlock_bh(&xprt->sc_ctxt_lock);
 
 out:
@@ -256,7 +255,7 @@ void svc_rdma_put_context(struct svc_rdma_op_ctxt *ctxt, int free_pages)
 
 	spin_lock_bh(&xprt->sc_ctxt_lock);
 	xprt->sc_ctxt_used--;
-	list_add(&ctxt->free, &xprt->sc_ctxts);
+	list_add(&ctxt->list, &xprt->sc_ctxts);
 	spin_unlock_bh(&xprt->sc_ctxt_lock);
 }
 
@@ -266,8 +265,8 @@ static void svc_rdma_destroy_ctxts(struct svcxprt_rdma *xprt)
 		struct svc_rdma_op_ctxt *ctxt;
 
 		ctxt = list_first_entry(&xprt->sc_ctxts,
-					struct svc_rdma_op_ctxt, free);
-		list_del(&ctxt->free);
+					struct svc_rdma_op_ctxt, list);
+		list_del(&ctxt->list);
 		kfree(ctxt);
 	}
 }
@@ -404,7 +403,7 @@ static void svc_rdma_wc_receive(struct ib_cq *cq, struct ib_wc *wc)
 	/* All wc fields are now known to be valid */
 	ctxt->byte_len = wc->byte_len;
 	spin_lock(&xprt->sc_rq_dto_lock);
-	list_add_tail(&ctxt->dto_q, &xprt->sc_rq_dto_q);
+	list_add_tail(&ctxt->list, &xprt->sc_rq_dto_q);
 	spin_unlock(&xprt->sc_rq_dto_lock);
 
 	set_bit(XPT_DATA, &xprt->sc_xprt.xpt_flags);
@@ -525,7 +524,7 @@ void svc_rdma_wc_read(struct ib_cq *cq, struct ib_wc *wc)
 
 		read_hdr = ctxt->read_hdr;
 		spin_lock(&xprt->sc_rq_dto_lock);
-		list_add_tail(&read_hdr->dto_q,
+		list_add_tail(&read_hdr->list,
 			      &xprt->sc_read_complete_q);
 		spin_unlock(&xprt->sc_rq_dto_lock);
 
@@ -1213,20 +1212,18 @@ static void __svc_rdma_free(struct work_struct *work)
 	 */
 	while (!list_empty(&rdma->sc_read_complete_q)) {
 		struct svc_rdma_op_ctxt *ctxt;
-		ctxt = list_entry(rdma->sc_read_complete_q.next,
-				  struct svc_rdma_op_ctxt,
-				  dto_q);
-		list_del_init(&ctxt->dto_q);
+		ctxt = list_first_entry(&rdma->sc_read_complete_q,
+					struct svc_rdma_op_ctxt, list);
+		list_del(&ctxt->list);
 		svc_rdma_put_context(ctxt, 1);
 	}
 
 	/* Destroy queued, but not processed recv completions */
 	while (!list_empty(&rdma->sc_rq_dto_q)) {
 		struct svc_rdma_op_ctxt *ctxt;
-		ctxt = list_entry(rdma->sc_rq_dto_q.next,
-				  struct svc_rdma_op_ctxt,
-				  dto_q);
-		list_del_init(&ctxt->dto_q);
+		ctxt = list_first_entry(&rdma->sc_rq_dto_q,
+					struct svc_rdma_op_ctxt, list);
+		list_del(&ctxt->list);
 		svc_rdma_put_context(ctxt, 1);
 	}
 

[PATCH v3 7/7] svcrdma: Poll CQs in "workqueue" mode

[Chuck Lever]

svcrdma calls svc_xprt_put() in its completion handlers, which
currently run in IRQ context.

However, svc_xprt_put() is meant to be invoked in process context,
not in IRQ context. After the last transport reference is gone, it
directly calls a transport release function that expects to run in
process context.

Change the CQ polling modes to IB_POLL_WORKQUEUE so that svcrdma
invokes svc_xprt_put() only in process context. As an added benefit,
bottom half-disabled spin locking can be eliminated from I/O paths.

Signed-off-by: Chuck Lever <chuck.lever-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
Reviewed-by: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
---
 net/sunrpc/xprtrdma/svc_rdma_recvfrom.c  |    6 +++---
 net/sunrpc/xprtrdma/svc_rdma_transport.c |   26 +++++++++++++-------------
 2 files changed, 16 insertions(+), 16 deletions(-)

diff --git a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
index b9ccd73..f7b2daf 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
@@ -606,12 +606,12 @@ int svc_rdma_recvfrom(struct svc_rqst *rqstp)
 
 	dprintk("svcrdma: rqstp=%p\n", rqstp);
 
-	spin_lock_bh(&rdma_xprt->sc_rq_dto_lock);
+	spin_lock(&rdma_xprt->sc_rq_dto_lock);
 	if (!list_empty(&rdma_xprt->sc_read_complete_q)) {
 		ctxt = list_first_entry(&rdma_xprt->sc_read_complete_q,
 					struct svc_rdma_op_ctxt, list);
 		list_del(&ctxt->list);
-		spin_unlock_bh(&rdma_xprt->sc_rq_dto_lock);
+		spin_unlock(&rdma_xprt->sc_rq_dto_lock);
 		rdma_read_complete(rqstp, ctxt);
 		goto complete;
 	} else if (!list_empty(&rdma_xprt->sc_rq_dto_q)) {
@@ -623,7 +623,7 @@ int svc_rdma_recvfrom(struct svc_rqst *rqstp)
 		clear_bit(XPT_DATA, &xprt->xpt_flags);
 		ctxt = NULL;
 	}
-	spin_unlock_bh(&rdma_xprt->sc_rq_dto_lock);
+	spin_unlock(&rdma_xprt->sc_rq_dto_lock);
 	if (!ctxt) {
 		/* This is the EAGAIN path. The svc_recv routine will
 		 * return -EAGAIN, the nfsd thread will go to call into
diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c b/net/sunrpc/xprtrdma/svc_rdma_transport.c
index 87b8b5a..ab2fd53 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_transport.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c
@@ -188,7 +188,7 @@ struct svc_rdma_op_ctxt *svc_rdma_get_context(struct svcxprt_rdma *xprt)
 {
 	struct svc_rdma_op_ctxt *ctxt = NULL;
 
-	spin_lock_bh(&xprt->sc_ctxt_lock);
+	spin_lock(&xprt->sc_ctxt_lock);
 	xprt->sc_ctxt_used++;
 	if (list_empty(&xprt->sc_ctxts))
 		goto out_empty;
@@ -196,7 +196,7 @@ struct svc_rdma_op_ctxt *svc_rdma_get_context(struct svcxprt_rdma *xprt)
 	ctxt = list_first_entry(&xprt->sc_ctxts,
 				struct svc_rdma_op_ctxt, list);
 	list_del(&ctxt->list);
-	spin_unlock_bh(&xprt->sc_ctxt_lock);
+	spin_unlock(&xprt->sc_ctxt_lock);
 
 out:
 	ctxt->count = 0;
@@ -208,15 +208,15 @@ struct svc_rdma_op_ctxt *svc_rdma_get_context(struct svcxprt_rdma *xprt)
 	/* Either pre-allocation missed the mark, or send
 	 * queue accounting is broken.
 	 */
-	spin_unlock_bh(&xprt->sc_ctxt_lock);
+	spin_unlock(&xprt->sc_ctxt_lock);
 
 	ctxt = alloc_ctxt(xprt, GFP_NOIO);
 	if (ctxt)
 		goto out;
 
-	spin_lock_bh(&xprt->sc_ctxt_lock);
+	spin_lock(&xprt->sc_ctxt_lock);
 	xprt->sc_ctxt_used--;
-	spin_unlock_bh(&xprt->sc_ctxt_lock);
+	spin_unlock(&xprt->sc_ctxt_lock);
 	WARN_ONCE(1, "svcrdma: empty RDMA ctxt list?\n");
 	return NULL;
 }
@@ -253,10 +253,10 @@ void svc_rdma_put_context(struct svc_rdma_op_ctxt *ctxt, int free_pages)
 		for (i = 0; i < ctxt->count; i++)
 			put_page(ctxt->pages[i]);
 
-	spin_lock_bh(&xprt->sc_ctxt_lock);
+	spin_lock(&xprt->sc_ctxt_lock);
 	xprt->sc_ctxt_used--;
 	list_add(&ctxt->list, &xprt->sc_ctxts);
-	spin_unlock_bh(&xprt->sc_ctxt_lock);
+	spin_unlock(&xprt->sc_ctxt_lock);
 }
 
 static void svc_rdma_destroy_ctxts(struct svcxprt_rdma *xprt)
@@ -921,14 +921,14 @@ struct svc_rdma_fastreg_mr *svc_rdma_get_frmr(struct svcxprt_rdma *rdma)
 {
 	struct svc_rdma_fastreg_mr *frmr = NULL;
 
-	spin_lock_bh(&rdma->sc_frmr_q_lock);
+	spin_lock(&rdma->sc_frmr_q_lock);
 	if (!list_empty(&rdma->sc_frmr_q)) {
 		frmr = list_entry(rdma->sc_frmr_q.next,
 				  struct svc_rdma_fastreg_mr, frmr_list);
 		list_del_init(&frmr->frmr_list);
 		frmr->sg_nents = 0;
 	}
-	spin_unlock_bh(&rdma->sc_frmr_q_lock);
+	spin_unlock(&rdma->sc_frmr_q_lock);
 	if (frmr)
 		return frmr;
 
@@ -941,10 +941,10 @@ void svc_rdma_put_frmr(struct svcxprt_rdma *rdma,
 	if (frmr) {
 		ib_dma_unmap_sg(rdma->sc_cm_id->device,
 				frmr->sg, frmr->sg_nents, frmr->direction);
-		spin_lock_bh(&rdma->sc_frmr_q_lock);
+		spin_lock(&rdma->sc_frmr_q_lock);
 		WARN_ON_ONCE(!list_empty(&frmr->frmr_list));
 		list_add(&frmr->frmr_list, &rdma->sc_frmr_q);
-		spin_unlock_bh(&rdma->sc_frmr_q_lock);
+		spin_unlock(&rdma->sc_frmr_q_lock);
 	}
 }
 
@@ -1026,13 +1026,13 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
 		goto errout;
 	}
 	newxprt->sc_sq_cq = ib_alloc_cq(dev, newxprt, newxprt->sc_sq_depth,
-					0, IB_POLL_SOFTIRQ);
+					0, IB_POLL_WORKQUEUE);
 	if (IS_ERR(newxprt->sc_sq_cq)) {
 		dprintk("svcrdma: error creating SQ CQ for connect request\n");
 		goto errout;
 	}
 	newxprt->sc_rq_cq = ib_alloc_cq(dev, newxprt, newxprt->sc_rq_depth,
-					0, IB_POLL_SOFTIRQ);
+					0, IB_POLL_WORKQUEUE);
 	if (IS_ERR(newxprt->sc_rq_cq)) {
 		dprintk("svcrdma: error creating RQ CQ for connect request\n");
 		goto errout;

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[PATCH v3 7/7] svcrdma: Poll CQs in "workqueue" mode

[Chuck Lever]

svcrdma calls svc_xprt_put() in its completion handlers, which
currently run in IRQ context.

However, svc_xprt_put() is meant to be invoked in process context,
not in IRQ context. After the last transport reference is gone, it
directly calls a transport release function that expects to run in
process context.

Change the CQ polling modes to IB_POLL_WORKQUEUE so that svcrdma
invokes svc_xprt_put() only in process context. As an added benefit,
bottom half-disabled spin locking can be eliminated from I/O paths.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
 net/sunrpc/xprtrdma/svc_rdma_recvfrom.c  |    6 +++---
 net/sunrpc/xprtrdma/svc_rdma_transport.c |   26 +++++++++++++-------------
 2 files changed, 16 insertions(+), 16 deletions(-)

diff --git a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
index b9ccd73..f7b2daf 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
@@ -606,12 +606,12 @@ int svc_rdma_recvfrom(struct svc_rqst *rqstp)
 
 	dprintk("svcrdma: rqstp=%p\n", rqstp);
 
-	spin_lock_bh(&rdma_xprt->sc_rq_dto_lock);
+	spin_lock(&rdma_xprt->sc_rq_dto_lock);
 	if (!list_empty(&rdma_xprt->sc_read_complete_q)) {
 		ctxt = list_first_entry(&rdma_xprt->sc_read_complete_q,
 					struct svc_rdma_op_ctxt, list);
 		list_del(&ctxt->list);
-		spin_unlock_bh(&rdma_xprt->sc_rq_dto_lock);
+		spin_unlock(&rdma_xprt->sc_rq_dto_lock);
 		rdma_read_complete(rqstp, ctxt);
 		goto complete;
 	} else if (!list_empty(&rdma_xprt->sc_rq_dto_q)) {
@@ -623,7 +623,7 @@ int svc_rdma_recvfrom(struct svc_rqst *rqstp)
 		clear_bit(XPT_DATA, &xprt->xpt_flags);
 		ctxt = NULL;
 	}
-	spin_unlock_bh(&rdma_xprt->sc_rq_dto_lock);
+	spin_unlock(&rdma_xprt->sc_rq_dto_lock);
 	if (!ctxt) {
 		/* This is the EAGAIN path. The svc_recv routine will
 		 * return -EAGAIN, the nfsd thread will go to call into
diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c b/net/sunrpc/xprtrdma/svc_rdma_transport.c
index 87b8b5a..ab2fd53 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_transport.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c
@@ -188,7 +188,7 @@ struct svc_rdma_op_ctxt *svc_rdma_get_context(struct svcxprt_rdma *xprt)
 {
 	struct svc_rdma_op_ctxt *ctxt = NULL;
 
-	spin_lock_bh(&xprt->sc_ctxt_lock);
+	spin_lock(&xprt->sc_ctxt_lock);
 	xprt->sc_ctxt_used++;
 	if (list_empty(&xprt->sc_ctxts))
 		goto out_empty;
@@ -196,7 +196,7 @@ struct svc_rdma_op_ctxt *svc_rdma_get_context(struct svcxprt_rdma *xprt)
 	ctxt = list_first_entry(&xprt->sc_ctxts,
 				struct svc_rdma_op_ctxt, list);
 	list_del(&ctxt->list);
-	spin_unlock_bh(&xprt->sc_ctxt_lock);
+	spin_unlock(&xprt->sc_ctxt_lock);
 
 out:
 	ctxt->count = 0;
@@ -208,15 +208,15 @@ struct svc_rdma_op_ctxt *svc_rdma_get_context(struct svcxprt_rdma *xprt)
 	/* Either pre-allocation missed the mark, or send
 	 * queue accounting is broken.
 	 */
-	spin_unlock_bh(&xprt->sc_ctxt_lock);
+	spin_unlock(&xprt->sc_ctxt_lock);
 
 	ctxt = alloc_ctxt(xprt, GFP_NOIO);
 	if (ctxt)
 		goto out;
 
-	spin_lock_bh(&xprt->sc_ctxt_lock);
+	spin_lock(&xprt->sc_ctxt_lock);
 	xprt->sc_ctxt_used--;
-	spin_unlock_bh(&xprt->sc_ctxt_lock);
+	spin_unlock(&xprt->sc_ctxt_lock);
 	WARN_ONCE(1, "svcrdma: empty RDMA ctxt list?\n");
 	return NULL;
 }
@@ -253,10 +253,10 @@ void svc_rdma_put_context(struct svc_rdma_op_ctxt *ctxt, int free_pages)
 		for (i = 0; i < ctxt->count; i++)
 			put_page(ctxt->pages[i]);
 
-	spin_lock_bh(&xprt->sc_ctxt_lock);
+	spin_lock(&xprt->sc_ctxt_lock);
 	xprt->sc_ctxt_used--;
 	list_add(&ctxt->list, &xprt->sc_ctxts);
-	spin_unlock_bh(&xprt->sc_ctxt_lock);
+	spin_unlock(&xprt->sc_ctxt_lock);
 }
 
 static void svc_rdma_destroy_ctxts(struct svcxprt_rdma *xprt)
@@ -921,14 +921,14 @@ struct svc_rdma_fastreg_mr *svc_rdma_get_frmr(struct svcxprt_rdma *rdma)
 {
 	struct svc_rdma_fastreg_mr *frmr = NULL;
 
-	spin_lock_bh(&rdma->sc_frmr_q_lock);
+	spin_lock(&rdma->sc_frmr_q_lock);
 	if (!list_empty(&rdma->sc_frmr_q)) {
 		frmr = list_entry(rdma->sc_frmr_q.next,
 				  struct svc_rdma_fastreg_mr, frmr_list);
 		list_del_init(&frmr->frmr_list);
 		frmr->sg_nents = 0;
 	}
-	spin_unlock_bh(&rdma->sc_frmr_q_lock);
+	spin_unlock(&rdma->sc_frmr_q_lock);
 	if (frmr)
 		return frmr;
 
@@ -941,10 +941,10 @@ void svc_rdma_put_frmr(struct svcxprt_rdma *rdma,
 	if (frmr) {
 		ib_dma_unmap_sg(rdma->sc_cm_id->device,
 				frmr->sg, frmr->sg_nents, frmr->direction);
-		spin_lock_bh(&rdma->sc_frmr_q_lock);
+		spin_lock(&rdma->sc_frmr_q_lock);
 		WARN_ON_ONCE(!list_empty(&frmr->frmr_list));
 		list_add(&frmr->frmr_list, &rdma->sc_frmr_q);
-		spin_unlock_bh(&rdma->sc_frmr_q_lock);
+		spin_unlock(&rdma->sc_frmr_q_lock);
 	}
 }
 
@@ -1026,13 +1026,13 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
 		goto errout;
 	}
 	newxprt->sc_sq_cq = ib_alloc_cq(dev, newxprt, newxprt->sc_sq_depth,
-					0, IB_POLL_SOFTIRQ);
+					0, IB_POLL_WORKQUEUE);
 	if (IS_ERR(newxprt->sc_sq_cq)) {
 		dprintk("svcrdma: error creating SQ CQ for connect request\n");
 		goto errout;
 	}
 	newxprt->sc_rq_cq = ib_alloc_cq(dev, newxprt, newxprt->sc_rq_depth,
-					0, IB_POLL_SOFTIRQ);
+					0, IB_POLL_WORKQUEUE);
 	if (IS_ERR(newxprt->sc_rq_cq)) {
 		dprintk("svcrdma: error creating RQ CQ for connect request\n");
 		goto errout;

Re: [PATCH v3 2/7] svcrdma: Clean up RPC-over-RDMA Reply header encoder

[Christoph Hellwig]

Looks fine,

Reviewed-by: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
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Re: [PATCH v3 2/7] svcrdma: Clean up RPC-over-RDMA Reply header encoder

[Christoph Hellwig]

Looks fine,

Reviewed-by: Christoph Hellwig <hch@lst.de>

Re: [PATCH v3 1/7] svcrdma: Another sendto chunk list parsing update

[Christoph Hellwig]

>  	/* Prepare the SGE for the RPCRDMA Header */
>  	ctxt->sge[0].lkey = rdma->sc_pd->local_dma_lkey;
> -	ctxt->sge[0].length = svc_rdma_xdr_get_reply_hdr_len(rdma_resp);
> +	ctxt->sge[0].length =
> +	    svc_rdma_xdr_get_reply_hdr_len((__be32 *)rdma_resp);

That case is pretty ugly, but given that it'll go away soon it's
probably fine for now.

Otherwise this look good:

Reviewed-by: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
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Re: [PATCH v3 1/7] svcrdma: Another sendto chunk list parsing update

[Christoph Hellwig]

>  	/* Prepare the SGE for the RPCRDMA Header */
>  	ctxt->sge[0].lkey = rdma->sc_pd->local_dma_lkey;
> -	ctxt->sge[0].length = svc_rdma_xdr_get_reply_hdr_len(rdma_resp);
> +	ctxt->sge[0].length =
> +	    svc_rdma_xdr_get_reply_hdr_len((__be32 *)rdma_resp);

That case is pretty ugly, but given that it'll go away soon it's
probably fine for now.

Otherwise this look good:

Reviewed-by: Christoph Hellwig <hch@lst.de>

Re: [PATCH v3 1/7] svcrdma: Another sendto chunk list parsing update

[Chuck Lever]

> On Feb 7, 2017, at 2:42 PM, Christoph Hellwig <hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org> wrote:
> 
>> 	/* Prepare the SGE for the RPCRDMA Header */
>> 	ctxt->sge[0].lkey = rdma->sc_pd->local_dma_lkey;
>> -	ctxt->sge[0].length = svc_rdma_xdr_get_reply_hdr_len(rdma_resp);
>> +	ctxt->sge[0].length =
>> +	    svc_rdma_xdr_get_reply_hdr_len((__be32 *)rdma_resp);
> 
> That case is pretty ugly, but given that it'll go away soon it's
> probably fine for now.

Yes, the type cast will be replaced.


> Otherwise this look good:
> 
> Reviewed-by: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>

Bruce, I assume you will pick up the extra Reviewed-by tags
if I don't have to send another version of this series.


--
Chuck Lever



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Re: [PATCH v3 1/7] svcrdma: Another sendto chunk list parsing update

[Chuck Lever]

> On Feb 7, 2017, at 2:42 PM, Christoph Hellwig <hch@infradead.org> wrote:
> 
>> 	/* Prepare the SGE for the RPCRDMA Header */
>> 	ctxt->sge[0].lkey = rdma->sc_pd->local_dma_lkey;
>> -	ctxt->sge[0].length = svc_rdma_xdr_get_reply_hdr_len(rdma_resp);
>> +	ctxt->sge[0].length =
>> +	    svc_rdma_xdr_get_reply_hdr_len((__be32 *)rdma_resp);
> 
> That case is pretty ugly, but given that it'll go away soon it's
> probably fine for now.

Yes, the type cast will be replaced.


> Otherwise this look good:
> 
> Reviewed-by: Christoph Hellwig <hch@lst.de>

Bruce, I assume you will pick up the extra Reviewed-by tags
if I don't have to send another version of this series.


--
Chuck Lever

Re: [PATCH v3 1/7] svcrdma: Another sendto chunk list parsing update

[J. Bruce Fields]

On Tue, Feb 07, 2017 at 03:30:58PM -0500, Chuck Lever wrote:
> 
> > On Feb 7, 2017, at 2:42 PM, Christoph Hellwig <hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org> wrote:
> > 
> >> 	/* Prepare the SGE for the RPCRDMA Header */
> >> 	ctxt->sge[0].lkey = rdma->sc_pd->local_dma_lkey;
> >> -	ctxt->sge[0].length = svc_rdma_xdr_get_reply_hdr_len(rdma_resp);
> >> +	ctxt->sge[0].length =
> >> +	    svc_rdma_xdr_get_reply_hdr_len((__be32 *)rdma_resp);
> > 
> > That case is pretty ugly, but given that it'll go away soon it's
> > probably fine for now.
> 
> Yes, the type cast will be replaced.
> 
> 
> > Otherwise this look good:
> > 
> > Reviewed-by: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
> 
> Bruce, I assume you will pick up the extra Reviewed-by tags
> if I don't have to send another version of this series.

Yep, will do.

Thanks to you and Christoph.

--b.
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Re: [PATCH v3 1/7] svcrdma: Another sendto chunk list parsing update

[J. Bruce Fields]

On Tue, Feb 07, 2017 at 03:30:58PM -0500, Chuck Lever wrote:
> 
> > On Feb 7, 2017, at 2:42 PM, Christoph Hellwig <hch@infradead.org> wrote:
> > 
> >> 	/* Prepare the SGE for the RPCRDMA Header */
> >> 	ctxt->sge[0].lkey = rdma->sc_pd->local_dma_lkey;
> >> -	ctxt->sge[0].length = svc_rdma_xdr_get_reply_hdr_len(rdma_resp);
> >> +	ctxt->sge[0].length =
> >> +	    svc_rdma_xdr_get_reply_hdr_len((__be32 *)rdma_resp);
> > 
> > That case is pretty ugly, but given that it'll go away soon it's
> > probably fine for now.
> 
> Yes, the type cast will be replaced.
> 
> 
> > Otherwise this look good:
> > 
> > Reviewed-by: Christoph Hellwig <hch@lst.de>
> 
> Bruce, I assume you will pick up the extra Reviewed-by tags
> if I don't have to send another version of this series.

Yep, will do.

Thanks to you and Christoph.

--b.