[PATCH 0/2] svcrdma: NFSRDMA Server fixes for 2.6.37

[PATCH 0/2] svcrdma: NFSRDMA Server fixes for 2.6.37

[Tom Tucker]

Hi Bruce,

These fixes are ready for 2.6.37. They fix two bugs in the server-side
NFSRDMA transport.

Thanks,
Tom
---

Tom Tucker (2):
      svcrdma: Cleanup DMA unmapping in error paths.
      svcrdma: Change DMA mapping logic to avoid the page_address kernel API


 net/sunrpc/xprtrdma/svc_rdma_recvfrom.c  |   19 ++++---
 net/sunrpc/xprtrdma/svc_rdma_sendto.c    |   82 ++++++++++++++++++++++--------
 net/sunrpc/xprtrdma/svc_rdma_transport.c |   41 +++++++--------
 3 files changed, 92 insertions(+), 50 deletions(-)

-- 
Signed-off-by: Tom Tucker <tom@ogc.us>

[PATCH 0/2] svcrdma: NFSRDMA Server fixes for 2.6.37

[Tom Tucker]

Hi Bruce,

These fixes are ready for 2.6.37. They fix two bugs in the server-side
NFSRDMA transport.

Thanks,
Tom
---

Tom Tucker (2):
      svcrdma: Cleanup DMA unmapping in error paths.
      svcrdma: Change DMA mapping logic to avoid the page_address kernel API


 net/sunrpc/xprtrdma/svc_rdma_recvfrom.c  |   19 ++++---
 net/sunrpc/xprtrdma/svc_rdma_sendto.c    |   82 ++++++++++++++++++++++--------
 net/sunrpc/xprtrdma/svc_rdma_transport.c |   41 +++++++--------
 3 files changed, 92 insertions(+), 50 deletions(-)

-- 
Signed-off-by: Tom Tucker <tom-/Yg/VP3ZvrM@public.gmane.org>
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[PATCH 1/2] svcrdma: Change DMA mapping logic to avoid the page_address kernel API

[Tom Tucker]

There was logic in the send path that assumed that a page containing data
to send to the client has a KVA. This is not always the case and can result
in data corruption when page_address returns zero and we end up DMA mapping
zero.

This patch changes the bus mapping logic to avoid page_address() where
necessary and converts all calls from ib_dma_map_single to ib_dma_map_page
in order to keep the map/unmap calls symmetric.

Signed-off-by: Tom Tucker <tom@ogc.us>
---

 net/sunrpc/xprtrdma/svc_rdma_recvfrom.c  |   18 ++++---
 net/sunrpc/xprtrdma/svc_rdma_sendto.c    |   80 ++++++++++++++++++++++--------
 net/sunrpc/xprtrdma/svc_rdma_transport.c |   18 +++----
 3 files changed, 78 insertions(+), 38 deletions(-)

diff --git a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
index 0194de8..926bdb4 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
@@ -263,9 +263,9 @@ static int fast_reg_read_chunks(struct svcxprt_rdma *xprt,
 	frmr->page_list_len = PAGE_ALIGN(byte_count) >> PAGE_SHIFT;
 	for (page_no = 0; page_no < frmr->page_list_len; page_no++) {
 		frmr->page_list->page_list[page_no] =
-			ib_dma_map_single(xprt->sc_cm_id->device,
-					  page_address(rqstp->rq_arg.pages[page_no]),
-					  PAGE_SIZE, DMA_FROM_DEVICE);
+			ib_dma_map_page(xprt->sc_cm_id->device,
+					rqstp->rq_arg.pages[page_no], 0,
+					PAGE_SIZE, DMA_FROM_DEVICE);
 		if (ib_dma_mapping_error(xprt->sc_cm_id->device,
 					 frmr->page_list->page_list[page_no]))
 			goto fatal_err;
@@ -309,17 +309,21 @@ static int rdma_set_ctxt_sge(struct svcxprt_rdma *xprt,
 			     int count)
 {
 	int i;
+	unsigned long off;
 
 	ctxt->count = count;
 	ctxt->direction = DMA_FROM_DEVICE;
 	for (i = 0; i < count; i++) {
 		ctxt->sge[i].length = 0; /* in case map fails */
 		if (!frmr) {
+			BUG_ON(0 == virt_to_page(vec[i].iov_base));
+			off = (unsigned long)vec[i].iov_base & ~PAGE_MASK;
 			ctxt->sge[i].addr =
-				ib_dma_map_single(xprt->sc_cm_id->device,
-						  vec[i].iov_base,
-						  vec[i].iov_len,
-						  DMA_FROM_DEVICE);
+				ib_dma_map_page(xprt->sc_cm_id->device,
+						virt_to_page(vec[i].iov_base),
+						off,
+						vec[i].iov_len,
+						DMA_FROM_DEVICE);
 			if (ib_dma_mapping_error(xprt->sc_cm_id->device,
 						 ctxt->sge[i].addr))
 				return -EINVAL;
diff --git a/net/sunrpc/xprtrdma/svc_rdma_sendto.c b/net/sunrpc/xprtrdma/svc_rdma_sendto.c
index b15e1eb..d4f5e0e 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_sendto.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_sendto.c
@@ -70,8 +70,8 @@
  * on extra page for the RPCRMDA header.
  */
 static int fast_reg_xdr(struct svcxprt_rdma *xprt,
-		 struct xdr_buf *xdr,
-		 struct svc_rdma_req_map *vec)
+			struct xdr_buf *xdr,
+			struct svc_rdma_req_map *vec)
 {
 	int sge_no;
 	u32 sge_bytes;
@@ -96,21 +96,25 @@ static int fast_reg_xdr(struct svcxprt_rdma *xprt,
 	vec->count = 2;
 	sge_no++;
 
-	/* Build the FRMR */
+	/* Map the XDR head */
 	frmr->kva = frva;
 	frmr->direction = DMA_TO_DEVICE;
 	frmr->access_flags = 0;
 	frmr->map_len = PAGE_SIZE;
 	frmr->page_list_len = 1;
+	page_off = (unsigned long)xdr->head[0].iov_base & ~PAGE_MASK;
 	frmr->page_list->page_list[page_no] =
-		ib_dma_map_single(xprt->sc_cm_id->device,
-				  (void *)xdr->head[0].iov_base,
-				  PAGE_SIZE, DMA_TO_DEVICE);
+		ib_dma_map_page(xprt->sc_cm_id->device,
+				virt_to_page(xdr->head[0].iov_base),
+				page_off,
+				PAGE_SIZE - page_off,
+				DMA_TO_DEVICE);
 	if (ib_dma_mapping_error(xprt->sc_cm_id->device,
 				 frmr->page_list->page_list[page_no]))
 		goto fatal_err;
 	atomic_inc(&xprt->sc_dma_used);
 
+	/* Map the XDR page list */
 	page_off = xdr->page_base;
 	page_bytes = xdr->page_len + page_off;
 	if (!page_bytes)
@@ -128,9 +132,9 @@ static int fast_reg_xdr(struct svcxprt_rdma *xprt,
 		page_bytes -= sge_bytes;
 
 		frmr->page_list->page_list[page_no] =
-			ib_dma_map_single(xprt->sc_cm_id->device,
-					  page_address(page),
-					  PAGE_SIZE, DMA_TO_DEVICE);
+			ib_dma_map_page(xprt->sc_cm_id->device,
+					page, page_off,
+					sge_bytes, DMA_TO_DEVICE);
 		if (ib_dma_mapping_error(xprt->sc_cm_id->device,
 					 frmr->page_list->page_list[page_no]))
 			goto fatal_err;
@@ -166,8 +170,10 @@ static int fast_reg_xdr(struct svcxprt_rdma *xprt,
 		vec->sge[sge_no].iov_base = frva + frmr->map_len + page_off;
 
 		frmr->page_list->page_list[page_no] =
-			ib_dma_map_single(xprt->sc_cm_id->device, va, PAGE_SIZE,
-					  DMA_TO_DEVICE);
+		    ib_dma_map_page(xprt->sc_cm_id->device, virt_to_page(va),
+				    page_off,
+				    PAGE_SIZE,
+				    DMA_TO_DEVICE);
 		if (ib_dma_mapping_error(xprt->sc_cm_id->device,
 					 frmr->page_list->page_list[page_no]))
 			goto fatal_err;
@@ -245,6 +251,35 @@ static int map_xdr(struct svcxprt_rdma *xprt,
 	return 0;
 }
 
+static dma_addr_t dma_map_xdr(struct svcxprt_rdma *xprt,
+			      struct xdr_buf *xdr,
+			      u32 xdr_off, size_t len, int dir)
+{
+	struct page *page;
+	dma_addr_t dma_addr;
+	if (xdr_off < xdr->head[0].iov_len) {
+		/* This offset is in the head */
+		xdr_off += (unsigned long)xdr->head[0].iov_base & ~PAGE_MASK;
+		page = virt_to_page(xdr->head[0].iov_base);
+	} else {
+		xdr_off -= xdr->head[0].iov_len;
+		if (xdr_off < xdr->page_len) {
+			/* This offset is in the page list */
+			page = xdr->pages[xdr_off >> PAGE_SHIFT];
+			xdr_off &= ~PAGE_MASK;
+		} else {
+			/* This offset is in the tail */
+			xdr_off -= xdr->page_len;
+			xdr_off += (unsigned long)
+				xdr->tail[0].iov_base & ~PAGE_MASK;
+			page = virt_to_page(xdr->tail[0].iov_base);
+		}
+	}
+	dma_addr = ib_dma_map_page(xprt->sc_cm_id->device, page, xdr_off,
+				   min_t(size_t, PAGE_SIZE, len), dir);
+	return dma_addr;
+}
+
 /* Assumptions:
  * - We are using FRMR
  *     - or -
@@ -293,10 +328,9 @@ static int send_write(struct svcxprt_rdma *xprt, struct svc_rqst *rqstp,
 		sge[sge_no].length = sge_bytes;
 		if (!vec->frmr) {
 			sge[sge_no].addr =
-				ib_dma_map_single(xprt->sc_cm_id->device,
-						  (void *)
-						  vec->sge[xdr_sge_no].iov_base + sge_off,
-						  sge_bytes, DMA_TO_DEVICE);
+				dma_map_xdr(xprt, &rqstp->rq_res, xdr_off,
+					    sge_bytes, DMA_TO_DEVICE);
+			xdr_off += sge_bytes;
 			if (ib_dma_mapping_error(xprt->sc_cm_id->device,
 						 sge[sge_no].addr))
 				goto err;
@@ -494,7 +528,8 @@ static int send_reply_chunks(struct svcxprt_rdma *xprt,
  * In all three cases, this function prepares the RPCRDMA header in
  * sge[0], the 'type' parameter indicates the type to place in the
  * RPCRDMA header, and the 'byte_count' field indicates how much of
- * the XDR to include in this RDMA_SEND.
+ * the XDR to include in this RDMA_SEND. NB: The offset of the payload
+ * to send is zero in the XDR.
  */
 static int send_reply(struct svcxprt_rdma *rdma,
 		      struct svc_rqst *rqstp,
@@ -536,23 +571,24 @@ static int send_reply(struct svcxprt_rdma *rdma,
 	ctxt->sge[0].lkey = rdma->sc_dma_lkey;
 	ctxt->sge[0].length = svc_rdma_xdr_get_reply_hdr_len(rdma_resp);
 	ctxt->sge[0].addr =
-		ib_dma_map_single(rdma->sc_cm_id->device, page_address(page),
-				  ctxt->sge[0].length, DMA_TO_DEVICE);
+	    ib_dma_map_page(rdma->sc_cm_id->device, page, 0,
+			    ctxt->sge[0].length, DMA_TO_DEVICE);
 	if (ib_dma_mapping_error(rdma->sc_cm_id->device, ctxt->sge[0].addr))
 		goto err;
 	atomic_inc(&rdma->sc_dma_used);
 
 	ctxt->direction = DMA_TO_DEVICE;
 
-	/* Determine how many of our SGE are to be transmitted */
+	/* Map the payload indicated by 'byte_count' */
 	for (sge_no = 1; byte_count && sge_no < vec->count; sge_no++) {
+		int xdr_off = 0;
 		sge_bytes = min_t(size_t, vec->sge[sge_no].iov_len, byte_count);
 		byte_count -= sge_bytes;
 		if (!vec->frmr) {
 			ctxt->sge[sge_no].addr =
-				ib_dma_map_single(rdma->sc_cm_id->device,
-						  vec->sge[sge_no].iov_base,
-						  sge_bytes, DMA_TO_DEVICE);
+				dma_map_xdr(rdma, &rqstp->rq_res, xdr_off,
+					    sge_bytes, DMA_TO_DEVICE);
+			xdr_off += sge_bytes;
 			if (ib_dma_mapping_error(rdma->sc_cm_id->device,
 						 ctxt->sge[sge_no].addr))
 				goto err;
diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c b/net/sunrpc/xprtrdma/svc_rdma_transport.c
index edea15a..23f90c3 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_transport.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c
@@ -120,7 +120,7 @@ void svc_rdma_unmap_dma(struct svc_rdma_op_ctxt *ctxt)
 		 */
 		if (ctxt->sge[i].lkey == xprt->sc_dma_lkey) {
 			atomic_dec(&xprt->sc_dma_used);
-			ib_dma_unmap_single(xprt->sc_cm_id->device,
+			ib_dma_unmap_page(xprt->sc_cm_id->device,
 					    ctxt->sge[i].addr,
 					    ctxt->sge[i].length,
 					    ctxt->direction);
@@ -502,8 +502,8 @@ int svc_rdma_post_recv(struct svcxprt_rdma *xprt)
 		BUG_ON(sge_no >= xprt->sc_max_sge);
 		page = svc_rdma_get_page();
 		ctxt->pages[sge_no] = page;
-		pa = ib_dma_map_single(xprt->sc_cm_id->device,
-				     page_address(page), PAGE_SIZE,
+		pa = ib_dma_map_page(xprt->sc_cm_id->device,
+				     page, 0, PAGE_SIZE,
 				     DMA_FROM_DEVICE);
 		if (ib_dma_mapping_error(xprt->sc_cm_id->device, pa))
 			goto err_put_ctxt;
@@ -798,8 +798,8 @@ static void frmr_unmap_dma(struct svcxprt_rdma *xprt,
 		if (ib_dma_mapping_error(frmr->mr->device, addr))
 			continue;
 		atomic_dec(&xprt->sc_dma_used);
-		ib_dma_unmap_single(frmr->mr->device, addr, PAGE_SIZE,
-				    frmr->direction);
+		ib_dma_unmap_page(frmr->mr->device, addr, PAGE_SIZE,
+				  frmr->direction);
 	}
 }
 
@@ -1274,7 +1274,7 @@ int svc_rdma_send(struct svcxprt_rdma *xprt, struct ib_send_wr *wr)
 				   atomic_read(&xprt->sc_sq_count) <
 				   xprt->sc_sq_depth);
 			if (test_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags))
-				return 0;
+				return -ENOTCONN;
 			continue;
 		}
 		/* Take a transport ref for each WR posted */
@@ -1320,8 +1320,8 @@ void svc_rdma_send_error(struct svcxprt_rdma *xprt, struct rpcrdma_msg *rmsgp,
 	length = svc_rdma_xdr_encode_error(xprt, rmsgp, err, va);
 
 	/* Prepare SGE for local address */
-	sge.addr = ib_dma_map_single(xprt->sc_cm_id->device,
-				   page_address(p), PAGE_SIZE, DMA_FROM_DEVICE);
+	sge.addr = ib_dma_map_page(xprt->sc_cm_id->device,
+				   p, 0, PAGE_SIZE, DMA_FROM_DEVICE);
 	if (ib_dma_mapping_error(xprt->sc_cm_id->device, sge.addr)) {
 		put_page(p);
 		return;
@@ -1348,7 +1348,7 @@ void svc_rdma_send_error(struct svcxprt_rdma *xprt, struct rpcrdma_msg *rmsgp,
 	if (ret) {
 		dprintk("svcrdma: Error %d posting send for protocol error\n",
 			ret);
-		ib_dma_unmap_single(xprt->sc_cm_id->device,
+		ib_dma_unmap_page(xprt->sc_cm_id->device,
 				  sge.addr, PAGE_SIZE,
 				  DMA_FROM_DEVICE);
 		svc_rdma_put_context(ctxt, 1);

[PATCH 1/2] svcrdma: Change DMA mapping logic to avoid the page_address kernel API

[Tom Tucker]

There was logic in the send path that assumed that a page containing data
to send to the client has a KVA. This is not always the case and can result
in data corruption when page_address returns zero and we end up DMA mapping
zero.

This patch changes the bus mapping logic to avoid page_address() where
necessary and converts all calls from ib_dma_map_single to ib_dma_map_page
in order to keep the map/unmap calls symmetric.

Signed-off-by: Tom Tucker <tom-/Yg/VP3ZvrM@public.gmane.org>
---

 net/sunrpc/xprtrdma/svc_rdma_recvfrom.c  |   18 ++++---
 net/sunrpc/xprtrdma/svc_rdma_sendto.c    |   80 ++++++++++++++++++++++--------
 net/sunrpc/xprtrdma/svc_rdma_transport.c |   18 +++----
 3 files changed, 78 insertions(+), 38 deletions(-)

diff --git a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
index 0194de8..926bdb4 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
@@ -263,9 +263,9 @@ static int fast_reg_read_chunks(struct svcxprt_rdma *xprt,
 	frmr->page_list_len = PAGE_ALIGN(byte_count) >> PAGE_SHIFT;
 	for (page_no = 0; page_no < frmr->page_list_len; page_no++) {
 		frmr->page_list->page_list[page_no] =
-			ib_dma_map_single(xprt->sc_cm_id->device,
-					  page_address(rqstp->rq_arg.pages[page_no]),
-					  PAGE_SIZE, DMA_FROM_DEVICE);
+			ib_dma_map_page(xprt->sc_cm_id->device,
+					rqstp->rq_arg.pages[page_no], 0,
+					PAGE_SIZE, DMA_FROM_DEVICE);
 		if (ib_dma_mapping_error(xprt->sc_cm_id->device,
 					 frmr->page_list->page_list[page_no]))
 			goto fatal_err;
@@ -309,17 +309,21 @@ static int rdma_set_ctxt_sge(struct svcxprt_rdma *xprt,
 			     int count)
 {
 	int i;
+	unsigned long off;
 
 	ctxt->count = count;
 	ctxt->direction = DMA_FROM_DEVICE;
 	for (i = 0; i < count; i++) {
 		ctxt->sge[i].length = 0; /* in case map fails */
 		if (!frmr) {
+			BUG_ON(0 == virt_to_page(vec[i].iov_base));
+			off = (unsigned long)vec[i].iov_base & ~PAGE_MASK;
 			ctxt->sge[i].addr =
-				ib_dma_map_single(xprt->sc_cm_id->device,
-						  vec[i].iov_base,
-						  vec[i].iov_len,
-						  DMA_FROM_DEVICE);
+				ib_dma_map_page(xprt->sc_cm_id->device,
+						virt_to_page(vec[i].iov_base),
+						off,
+						vec[i].iov_len,
+						DMA_FROM_DEVICE);
 			if (ib_dma_mapping_error(xprt->sc_cm_id->device,
 						 ctxt->sge[i].addr))
 				return -EINVAL;
diff --git a/net/sunrpc/xprtrdma/svc_rdma_sendto.c b/net/sunrpc/xprtrdma/svc_rdma_sendto.c
index b15e1eb..d4f5e0e 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_sendto.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_sendto.c
@@ -70,8 +70,8 @@
  * on extra page for the RPCRMDA header.
  */
 static int fast_reg_xdr(struct svcxprt_rdma *xprt,
-		 struct xdr_buf *xdr,
-		 struct svc_rdma_req_map *vec)
+			struct xdr_buf *xdr,
+			struct svc_rdma_req_map *vec)
 {
 	int sge_no;
 	u32 sge_bytes;
@@ -96,21 +96,25 @@ static int fast_reg_xdr(struct svcxprt_rdma *xprt,
 	vec->count = 2;
 	sge_no++;
 
-	/* Build the FRMR */
+	/* Map the XDR head */
 	frmr->kva = frva;
 	frmr->direction = DMA_TO_DEVICE;
 	frmr->access_flags = 0;
 	frmr->map_len = PAGE_SIZE;
 	frmr->page_list_len = 1;
+	page_off = (unsigned long)xdr->head[0].iov_base & ~PAGE_MASK;
 	frmr->page_list->page_list[page_no] =
-		ib_dma_map_single(xprt->sc_cm_id->device,
-				  (void *)xdr->head[0].iov_base,
-				  PAGE_SIZE, DMA_TO_DEVICE);
+		ib_dma_map_page(xprt->sc_cm_id->device,
+				virt_to_page(xdr->head[0].iov_base),
+				page_off,
+				PAGE_SIZE - page_off,
+				DMA_TO_DEVICE);
 	if (ib_dma_mapping_error(xprt->sc_cm_id->device,
 				 frmr->page_list->page_list[page_no]))
 		goto fatal_err;
 	atomic_inc(&xprt->sc_dma_used);
 
+	/* Map the XDR page list */
 	page_off = xdr->page_base;
 	page_bytes = xdr->page_len + page_off;
 	if (!page_bytes)
@@ -128,9 +132,9 @@ static int fast_reg_xdr(struct svcxprt_rdma *xprt,
 		page_bytes -= sge_bytes;
 
 		frmr->page_list->page_list[page_no] =
-			ib_dma_map_single(xprt->sc_cm_id->device,
-					  page_address(page),
-					  PAGE_SIZE, DMA_TO_DEVICE);
+			ib_dma_map_page(xprt->sc_cm_id->device,
+					page, page_off,
+					sge_bytes, DMA_TO_DEVICE);
 		if (ib_dma_mapping_error(xprt->sc_cm_id->device,
 					 frmr->page_list->page_list[page_no]))
 			goto fatal_err;
@@ -166,8 +170,10 @@ static int fast_reg_xdr(struct svcxprt_rdma *xprt,
 		vec->sge[sge_no].iov_base = frva + frmr->map_len + page_off;
 
 		frmr->page_list->page_list[page_no] =
-			ib_dma_map_single(xprt->sc_cm_id->device, va, PAGE_SIZE,
-					  DMA_TO_DEVICE);
+		    ib_dma_map_page(xprt->sc_cm_id->device, virt_to_page(va),
+				    page_off,
+				    PAGE_SIZE,
+				    DMA_TO_DEVICE);
 		if (ib_dma_mapping_error(xprt->sc_cm_id->device,
 					 frmr->page_list->page_list[page_no]))
 			goto fatal_err;
@@ -245,6 +251,35 @@ static int map_xdr(struct svcxprt_rdma *xprt,
 	return 0;
 }
 
+static dma_addr_t dma_map_xdr(struct svcxprt_rdma *xprt,
+			      struct xdr_buf *xdr,
+			      u32 xdr_off, size_t len, int dir)
+{
+	struct page *page;
+	dma_addr_t dma_addr;
+	if (xdr_off < xdr->head[0].iov_len) {
+		/* This offset is in the head */
+		xdr_off += (unsigned long)xdr->head[0].iov_base & ~PAGE_MASK;
+		page = virt_to_page(xdr->head[0].iov_base);
+	} else {
+		xdr_off -= xdr->head[0].iov_len;
+		if (xdr_off < xdr->page_len) {
+			/* This offset is in the page list */
+			page = xdr->pages[xdr_off >> PAGE_SHIFT];
+			xdr_off &= ~PAGE_MASK;
+		} else {
+			/* This offset is in the tail */
+			xdr_off -= xdr->page_len;
+			xdr_off += (unsigned long)
+				xdr->tail[0].iov_base & ~PAGE_MASK;
+			page = virt_to_page(xdr->tail[0].iov_base);
+		}
+	}
+	dma_addr = ib_dma_map_page(xprt->sc_cm_id->device, page, xdr_off,
+				   min_t(size_t, PAGE_SIZE, len), dir);
+	return dma_addr;
+}
+
 /* Assumptions:
  * - We are using FRMR
  *     - or -
@@ -293,10 +328,9 @@ static int send_write(struct svcxprt_rdma *xprt, struct svc_rqst *rqstp,
 		sge[sge_no].length = sge_bytes;
 		if (!vec->frmr) {
 			sge[sge_no].addr =
-				ib_dma_map_single(xprt->sc_cm_id->device,
-						  (void *)
-						  vec->sge[xdr_sge_no].iov_base + sge_off,
-						  sge_bytes, DMA_TO_DEVICE);
+				dma_map_xdr(xprt, &rqstp->rq_res, xdr_off,
+					    sge_bytes, DMA_TO_DEVICE);
+			xdr_off += sge_bytes;
 			if (ib_dma_mapping_error(xprt->sc_cm_id->device,
 						 sge[sge_no].addr))
 				goto err;
@@ -494,7 +528,8 @@ static int send_reply_chunks(struct svcxprt_rdma *xprt,
  * In all three cases, this function prepares the RPCRDMA header in
  * sge[0], the 'type' parameter indicates the type to place in the
  * RPCRDMA header, and the 'byte_count' field indicates how much of
- * the XDR to include in this RDMA_SEND.
+ * the XDR to include in this RDMA_SEND. NB: The offset of the payload
+ * to send is zero in the XDR.
  */
 static int send_reply(struct svcxprt_rdma *rdma,
 		      struct svc_rqst *rqstp,
@@ -536,23 +571,24 @@ static int send_reply(struct svcxprt_rdma *rdma,
 	ctxt->sge[0].lkey = rdma->sc_dma_lkey;
 	ctxt->sge[0].length = svc_rdma_xdr_get_reply_hdr_len(rdma_resp);
 	ctxt->sge[0].addr =
-		ib_dma_map_single(rdma->sc_cm_id->device, page_address(page),
-				  ctxt->sge[0].length, DMA_TO_DEVICE);
+	    ib_dma_map_page(rdma->sc_cm_id->device, page, 0,
+			    ctxt->sge[0].length, DMA_TO_DEVICE);
 	if (ib_dma_mapping_error(rdma->sc_cm_id->device, ctxt->sge[0].addr))
 		goto err;
 	atomic_inc(&rdma->sc_dma_used);
 
 	ctxt->direction = DMA_TO_DEVICE;
 
-	/* Determine how many of our SGE are to be transmitted */
+	/* Map the payload indicated by 'byte_count' */
 	for (sge_no = 1; byte_count && sge_no < vec->count; sge_no++) {
+		int xdr_off = 0;
 		sge_bytes = min_t(size_t, vec->sge[sge_no].iov_len, byte_count);
 		byte_count -= sge_bytes;
 		if (!vec->frmr) {
 			ctxt->sge[sge_no].addr =
-				ib_dma_map_single(rdma->sc_cm_id->device,
-						  vec->sge[sge_no].iov_base,
-						  sge_bytes, DMA_TO_DEVICE);
+				dma_map_xdr(rdma, &rqstp->rq_res, xdr_off,
+					    sge_bytes, DMA_TO_DEVICE);
+			xdr_off += sge_bytes;
 			if (ib_dma_mapping_error(rdma->sc_cm_id->device,
 						 ctxt->sge[sge_no].addr))
 				goto err;
diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c b/net/sunrpc/xprtrdma/svc_rdma_transport.c
index edea15a..23f90c3 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_transport.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c
@@ -120,7 +120,7 @@ void svc_rdma_unmap_dma(struct svc_rdma_op_ctxt *ctxt)
 		 */
 		if (ctxt->sge[i].lkey == xprt->sc_dma_lkey) {
 			atomic_dec(&xprt->sc_dma_used);
-			ib_dma_unmap_single(xprt->sc_cm_id->device,
+			ib_dma_unmap_page(xprt->sc_cm_id->device,
 					    ctxt->sge[i].addr,
 					    ctxt->sge[i].length,
 					    ctxt->direction);
@@ -502,8 +502,8 @@ int svc_rdma_post_recv(struct svcxprt_rdma *xprt)
 		BUG_ON(sge_no >= xprt->sc_max_sge);
 		page = svc_rdma_get_page();
 		ctxt->pages[sge_no] = page;
-		pa = ib_dma_map_single(xprt->sc_cm_id->device,
-				     page_address(page), PAGE_SIZE,
+		pa = ib_dma_map_page(xprt->sc_cm_id->device,
+				     page, 0, PAGE_SIZE,
 				     DMA_FROM_DEVICE);
 		if (ib_dma_mapping_error(xprt->sc_cm_id->device, pa))
 			goto err_put_ctxt;
@@ -798,8 +798,8 @@ static void frmr_unmap_dma(struct svcxprt_rdma *xprt,
 		if (ib_dma_mapping_error(frmr->mr->device, addr))
 			continue;
 		atomic_dec(&xprt->sc_dma_used);
-		ib_dma_unmap_single(frmr->mr->device, addr, PAGE_SIZE,
-				    frmr->direction);
+		ib_dma_unmap_page(frmr->mr->device, addr, PAGE_SIZE,
+				  frmr->direction);
 	}
 }
 
@@ -1274,7 +1274,7 @@ int svc_rdma_send(struct svcxprt_rdma *xprt, struct ib_send_wr *wr)
 				   atomic_read(&xprt->sc_sq_count) <
 				   xprt->sc_sq_depth);
 			if (test_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags))
-				return 0;
+				return -ENOTCONN;
 			continue;
 		}
 		/* Take a transport ref for each WR posted */
@@ -1320,8 +1320,8 @@ void svc_rdma_send_error(struct svcxprt_rdma *xprt, struct rpcrdma_msg *rmsgp,
 	length = svc_rdma_xdr_encode_error(xprt, rmsgp, err, va);
 
 	/* Prepare SGE for local address */
-	sge.addr = ib_dma_map_single(xprt->sc_cm_id->device,
-				   page_address(p), PAGE_SIZE, DMA_FROM_DEVICE);
+	sge.addr = ib_dma_map_page(xprt->sc_cm_id->device,
+				   p, 0, PAGE_SIZE, DMA_FROM_DEVICE);
 	if (ib_dma_mapping_error(xprt->sc_cm_id->device, sge.addr)) {
 		put_page(p);
 		return;
@@ -1348,7 +1348,7 @@ void svc_rdma_send_error(struct svcxprt_rdma *xprt, struct rpcrdma_msg *rmsgp,
 	if (ret) {
 		dprintk("svcrdma: Error %d posting send for protocol error\n",
 			ret);
-		ib_dma_unmap_single(xprt->sc_cm_id->device,
+		ib_dma_unmap_page(xprt->sc_cm_id->device,
 				  sge.addr, PAGE_SIZE,
 				  DMA_FROM_DEVICE);
 		svc_rdma_put_context(ctxt, 1);

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Re: [PATCH 1/2] svcrdma: Change DMA mapping logic to avoid the page_address kernel API

[Or Gerlitz]

 Tom Tucker <tom@ogc.us> wrote:

> This patch changes the bus mapping logic to avoid page_address() where necessary

Hi Tom,

Does "when necessary" comes to say that invocations of page_address
which remained in the code after this patch was applied are safe and
no kmap call is needed?

Or.

Re: [PATCH 1/2] svcrdma: Change DMA mapping logic to avoid the page_address kernel API

[Or Gerlitz]

 Tom Tucker <tom-/Yg/VP3ZvrM@public.gmane.org> wrote:

> This patch changes the bus mapping logic to avoid page_address() where necessary

Hi Tom,

Does "when necessary" comes to say that invocations of page_address
which remained in the code after this patch was applied are safe and
no kmap call is needed?

Or.
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Re: [PATCH 1/2] svcrdma: Change DMA mapping logic to avoid the page_address kernel API

[Tom Tucker]

On 11/16/10 1:39 PM, Or Gerlitz wrote:
>   Tom Tucker<tom@ogc.us>  wrote:
>
>> This patch changes the bus mapping logic to avoid page_address() where necessary
> Hi Tom,
>
> Does "when necessary" comes to say that invocations of page_address
> which remained in the code after this patch was applied are safe and
> no kmap call is needed?

That's the premise. Please let me know if something looks suspicious.

Thanks,
Tom

> Or.
> --
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Re: [PATCH 1/2] svcrdma: Change DMA mapping logic to avoid the page_address kernel API

[Tom Tucker]

On 11/16/10 1:39 PM, Or Gerlitz wrote:
>   Tom Tucker<tom-/Yg/VP3ZvrM@public.gmane.org>  wrote:
>
>> This patch changes the bus mapping logic to avoid page_address() where necessary
> Hi Tom,
>
> Does "when necessary" comes to say that invocations of page_address
> which remained in the code after this patch was applied are safe and
> no kmap call is needed?

That's the premise. Please let me know if something looks suspicious.

Thanks,
Tom

> Or.
> --
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> the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
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[PATCH 2/2] svcrdma: Cleanup DMA unmapping in error paths.

[Tom Tucker]

There are several error paths in the code that do not unmap DMA. This
patch adds calls to svc_rdma_unmap_dma to free these DMA contexts.

Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
---

 net/sunrpc/xprtrdma/svc_rdma_recvfrom.c  |    1 +
 net/sunrpc/xprtrdma/svc_rdma_sendto.c    |    2 ++
 net/sunrpc/xprtrdma/svc_rdma_transport.c |   29 ++++++++++++++---------------
 3 files changed, 17 insertions(+), 15 deletions(-)

diff --git a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
index 926bdb4..df67211 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
@@ -495,6 +495,7 @@ next_sge:
 			printk(KERN_ERR "svcrdma: Error %d posting RDMA_READ\n",
 			       err);
 			set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
+			svc_rdma_unmap_dma(ctxt);
 			svc_rdma_put_context(ctxt, 0);
 			goto out;
 		}
diff --git a/net/sunrpc/xprtrdma/svc_rdma_sendto.c b/net/sunrpc/xprtrdma/svc_rdma_sendto.c
index d4f5e0e..249a835 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_sendto.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_sendto.c
@@ -367,6 +367,8 @@ static int send_write(struct svcxprt_rdma *xprt, struct svc_rqst *rqstp,
 		goto err;
 	return 0;
  err:
+	svc_rdma_unmap_dma(ctxt);
+	svc_rdma_put_frmr(xprt, vec->frmr);
 	svc_rdma_put_context(ctxt, 0);
 	/* Fatal error, close transport */
 	return -EIO;
diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c b/net/sunrpc/xprtrdma/svc_rdma_transport.c
index 23f90c3..d22a44d 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_transport.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c
@@ -511,9 +511,9 @@ int svc_rdma_post_recv(struct svcxprt_rdma *xprt)
 		ctxt->sge[sge_no].addr = pa;
 		ctxt->sge[sge_no].length = PAGE_SIZE;
 		ctxt->sge[sge_no].lkey = xprt->sc_dma_lkey;
+		ctxt->count = sge_no + 1;
 		buflen += PAGE_SIZE;
 	}
-	ctxt->count = sge_no;
 	recv_wr.next = NULL;
 	recv_wr.sg_list = &ctxt->sge[0];
 	recv_wr.num_sge = ctxt->count;
@@ -529,6 +529,7 @@ int svc_rdma_post_recv(struct svcxprt_rdma *xprt)
 	return ret;
 
  err_put_ctxt:
+	svc_rdma_unmap_dma(ctxt);
 	svc_rdma_put_context(ctxt, 1);
 	return -ENOMEM;
 }
@@ -1306,7 +1307,6 @@ void svc_rdma_send_error(struct svcxprt_rdma *xprt, struct rpcrdma_msg *rmsgp,
 			 enum rpcrdma_errcode err)
 {
 	struct ib_send_wr err_wr;
-	struct ib_sge sge;
 	struct page *p;
 	struct svc_rdma_op_ctxt *ctxt;
 	u32 *va;
@@ -1319,26 +1319,27 @@ void svc_rdma_send_error(struct svcxprt_rdma *xprt, struct rpcrdma_msg *rmsgp,
 	/* XDR encode error */
 	length = svc_rdma_xdr_encode_error(xprt, rmsgp, err, va);
 
+	ctxt = svc_rdma_get_context(xprt);
+	ctxt->direction = DMA_FROM_DEVICE;
+	ctxt->count = 1;
+	ctxt->pages[0] = p;
+
 	/* Prepare SGE for local address */
-	sge.addr = ib_dma_map_page(xprt->sc_cm_id->device,
-				   p, 0, PAGE_SIZE, DMA_FROM_DEVICE);
-	if (ib_dma_mapping_error(xprt->sc_cm_id->device, sge.addr)) {
+	ctxt->sge[0].addr = ib_dma_map_page(xprt->sc_cm_id->device,
+					    p, 0, length, DMA_FROM_DEVICE);
+	if (ib_dma_mapping_error(xprt->sc_cm_id->device, ctxt->sge[0].addr)) {
 		put_page(p);
 		return;
 	}
 	atomic_inc(&xprt->sc_dma_used);
-	sge.lkey = xprt->sc_dma_lkey;
-	sge.length = length;
-
-	ctxt = svc_rdma_get_context(xprt);
-	ctxt->count = 1;
-	ctxt->pages[0] = p;
+	ctxt->sge[0].lkey = xprt->sc_dma_lkey;
+	ctxt->sge[0].length = length;
 
 	/* Prepare SEND WR */
 	memset(&err_wr, 0, sizeof err_wr);
 	ctxt->wr_op = IB_WR_SEND;
 	err_wr.wr_id = (unsigned long)ctxt;
-	err_wr.sg_list = &sge;
+	err_wr.sg_list = ctxt->sge;
 	err_wr.num_sge = 1;
 	err_wr.opcode = IB_WR_SEND;
 	err_wr.send_flags = IB_SEND_SIGNALED;
@@ -1348,9 +1349,7 @@ void svc_rdma_send_error(struct svcxprt_rdma *xprt, struct rpcrdma_msg *rmsgp,
 	if (ret) {
 		dprintk("svcrdma: Error %d posting send for protocol error\n",
 			ret);
-		ib_dma_unmap_page(xprt->sc_cm_id->device,
-				  sge.addr, PAGE_SIZE,
-				  DMA_FROM_DEVICE);
+		svc_rdma_unmap_dma(ctxt);
 		svc_rdma_put_context(ctxt, 1);
 	}
 }

[PATCH 2/2] svcrdma: Cleanup DMA unmapping in error paths.

[Tom Tucker]

There are several error paths in the code that do not unmap DMA. This
patch adds calls to svc_rdma_unmap_dma to free these DMA contexts.

Signed-off-by: Tom Tucker <tom-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>
---

 net/sunrpc/xprtrdma/svc_rdma_recvfrom.c  |    1 +
 net/sunrpc/xprtrdma/svc_rdma_sendto.c    |    2 ++
 net/sunrpc/xprtrdma/svc_rdma_transport.c |   29 ++++++++++++++---------------
 3 files changed, 17 insertions(+), 15 deletions(-)

diff --git a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
index 926bdb4..df67211 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
@@ -495,6 +495,7 @@ next_sge:
 			printk(KERN_ERR "svcrdma: Error %d posting RDMA_READ\n",
 			       err);
 			set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
+			svc_rdma_unmap_dma(ctxt);
 			svc_rdma_put_context(ctxt, 0);
 			goto out;
 		}
diff --git a/net/sunrpc/xprtrdma/svc_rdma_sendto.c b/net/sunrpc/xprtrdma/svc_rdma_sendto.c
index d4f5e0e..249a835 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_sendto.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_sendto.c
@@ -367,6 +367,8 @@ static int send_write(struct svcxprt_rdma *xprt, struct svc_rqst *rqstp,
 		goto err;
 	return 0;
  err:
+	svc_rdma_unmap_dma(ctxt);
+	svc_rdma_put_frmr(xprt, vec->frmr);
 	svc_rdma_put_context(ctxt, 0);
 	/* Fatal error, close transport */
 	return -EIO;
diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c b/net/sunrpc/xprtrdma/svc_rdma_transport.c
index 23f90c3..d22a44d 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_transport.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c
@@ -511,9 +511,9 @@ int svc_rdma_post_recv(struct svcxprt_rdma *xprt)
 		ctxt->sge[sge_no].addr = pa;
 		ctxt->sge[sge_no].length = PAGE_SIZE;
 		ctxt->sge[sge_no].lkey = xprt->sc_dma_lkey;
+		ctxt->count = sge_no + 1;
 		buflen += PAGE_SIZE;
 	}
-	ctxt->count = sge_no;
 	recv_wr.next = NULL;
 	recv_wr.sg_list = &ctxt->sge[0];
 	recv_wr.num_sge = ctxt->count;
@@ -529,6 +529,7 @@ int svc_rdma_post_recv(struct svcxprt_rdma *xprt)
 	return ret;
 
  err_put_ctxt:
+	svc_rdma_unmap_dma(ctxt);
 	svc_rdma_put_context(ctxt, 1);
 	return -ENOMEM;
 }
@@ -1306,7 +1307,6 @@ void svc_rdma_send_error(struct svcxprt_rdma *xprt, struct rpcrdma_msg *rmsgp,
 			 enum rpcrdma_errcode err)
 {
 	struct ib_send_wr err_wr;
-	struct ib_sge sge;
 	struct page *p;
 	struct svc_rdma_op_ctxt *ctxt;
 	u32 *va;
@@ -1319,26 +1319,27 @@ void svc_rdma_send_error(struct svcxprt_rdma *xprt, struct rpcrdma_msg *rmsgp,
 	/* XDR encode error */
 	length = svc_rdma_xdr_encode_error(xprt, rmsgp, err, va);
 
+	ctxt = svc_rdma_get_context(xprt);
+	ctxt->direction = DMA_FROM_DEVICE;
+	ctxt->count = 1;
+	ctxt->pages[0] = p;
+
 	/* Prepare SGE for local address */
-	sge.addr = ib_dma_map_page(xprt->sc_cm_id->device,
-				   p, 0, PAGE_SIZE, DMA_FROM_DEVICE);
-	if (ib_dma_mapping_error(xprt->sc_cm_id->device, sge.addr)) {
+	ctxt->sge[0].addr = ib_dma_map_page(xprt->sc_cm_id->device,
+					    p, 0, length, DMA_FROM_DEVICE);
+	if (ib_dma_mapping_error(xprt->sc_cm_id->device, ctxt->sge[0].addr)) {
 		put_page(p);
 		return;
 	}
 	atomic_inc(&xprt->sc_dma_used);
-	sge.lkey = xprt->sc_dma_lkey;
-	sge.length = length;
-
-	ctxt = svc_rdma_get_context(xprt);
-	ctxt->count = 1;
-	ctxt->pages[0] = p;
+	ctxt->sge[0].lkey = xprt->sc_dma_lkey;
+	ctxt->sge[0].length = length;
 
 	/* Prepare SEND WR */
 	memset(&err_wr, 0, sizeof err_wr);
 	ctxt->wr_op = IB_WR_SEND;
 	err_wr.wr_id = (unsigned long)ctxt;
-	err_wr.sg_list = &sge;
+	err_wr.sg_list = ctxt->sge;
 	err_wr.num_sge = 1;
 	err_wr.opcode = IB_WR_SEND;
 	err_wr.send_flags = IB_SEND_SIGNALED;
@@ -1348,9 +1349,7 @@ void svc_rdma_send_error(struct svcxprt_rdma *xprt, struct rpcrdma_msg *rmsgp,
 	if (ret) {
 		dprintk("svcrdma: Error %d posting send for protocol error\n",
 			ret);
-		ib_dma_unmap_page(xprt->sc_cm_id->device,
-				  sge.addr, PAGE_SIZE,
-				  DMA_FROM_DEVICE);
+		svc_rdma_unmap_dma(ctxt);
 		svc_rdma_put_context(ctxt, 1);
 	}
 }

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Re: [PATCH 0/2] svcrdma: NFSRDMA Server fixes for 2.6.37

[J. Bruce Fields]

On Tue, Oct 12, 2010 at 03:33:46PM -0500, Tom Tucker wrote:
> Hi Bruce,
> 
> These fixes are ready for 2.6.37. They fix two bugs in the server-side
> NFSRDMA transport.

Both applied and pushed out, thanks.

--b.

> 
> Thanks,
> Tom
> ---
> 
> Tom Tucker (2):
>       svcrdma: Cleanup DMA unmapping in error paths.
>       svcrdma: Change DMA mapping logic to avoid the page_address kernel API
> 
> 
>  net/sunrpc/xprtrdma/svc_rdma_recvfrom.c  |   19 ++++---
>  net/sunrpc/xprtrdma/svc_rdma_sendto.c    |   82 ++++++++++++++++++++++--------
>  net/sunrpc/xprtrdma/svc_rdma_transport.c |   41 +++++++--------
>  3 files changed, 92 insertions(+), 50 deletions(-)
> 
> -- 
> Signed-off-by: Tom Tucker <tom@ogc.us>

Re: [PATCH 0/2] svcrdma: NFSRDMA Server fixes for 2.6.37

[J. Bruce Fields]

On Tue, Oct 12, 2010 at 03:33:46PM -0500, Tom Tucker wrote:
> Hi Bruce,
> 
> These fixes are ready for 2.6.37. They fix two bugs in the server-side
> NFSRDMA transport.

Both applied and pushed out, thanks.

--b.

> 
> Thanks,
> Tom
> ---
> 
> Tom Tucker (2):
>       svcrdma: Cleanup DMA unmapping in error paths.
>       svcrdma: Change DMA mapping logic to avoid the page_address kernel API
> 
> 
>  net/sunrpc/xprtrdma/svc_rdma_recvfrom.c  |   19 ++++---
>  net/sunrpc/xprtrdma/svc_rdma_sendto.c    |   82 ++++++++++++++++++++++--------
>  net/sunrpc/xprtrdma/svc_rdma_transport.c |   41 +++++++--------
>  3 files changed, 92 insertions(+), 50 deletions(-)
> 
> -- 
> Signed-off-by: Tom Tucker <tom-/Yg/VP3ZvrM@public.gmane.org>
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