From: Long Li <longli@microsoft.com>
Date: Mon, 13 May 2019 21:01:29 -0700
Subject: [PATCH] cifs:smbd Use the correct DMA direction when sending data
Git-commit: 7f46d23e1b14f0827eb19c60eedcc6525ca2e742
Patch-mainline: v5.2-rc1
References: bsc#1144333

When sending data, use the DMA_TO_DEVICE to map buffers. Also log the number
of requests in a compounding request from upper layer.

Signed-off-by: Long Li <longli@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Acked-by: Pavel Shilovsky <pshilov@microsoft.com>
Acked-by: Ronnie Sahlberg <lsahlber@redhat.com>
Acked-by: Paulo Alcantara <palcantara@suse.de>
---
 fs/cifs/smbdirect.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/fs/cifs/smbdirect.c b/fs/cifs/smbdirect.c
index 251ef1223206..caac37b1de8c 100644
--- a/fs/cifs/smbdirect.c
+++ b/fs/cifs/smbdirect.c
@@ -903,7 +903,7 @@ static int smbd_create_header(struct smbd_connection *info,
 	request->sge[0].addr = ib_dma_map_single(info->id->device,
 						 (void *)packet,
 						 header_length,
-						 DMA_BIDIRECTIONAL);
+						 DMA_TO_DEVICE);
 	if (ib_dma_mapping_error(info->id->device, request->sge[0].addr)) {
 		mempool_free(request, info->request_mempool);
 		rc = -EIO;
@@ -1005,7 +1005,7 @@ static int smbd_post_send_sgl(struct smbd_connection *info,
 	for_each_sg(sgl, sg, num_sgs, i) {
 		request->sge[i+1].addr =
 			ib_dma_map_page(info->id->device, sg_page(sg),
-			       sg->offset, sg->length, DMA_BIDIRECTIONAL);
+			       sg->offset, sg->length, DMA_TO_DEVICE);
 		if (ib_dma_mapping_error(
 				info->id->device, request->sge[i+1].addr)) {
 			rc = -EIO;
@@ -2110,8 +2110,10 @@ int smbd_send(struct TCP_Server_Info *server,
 		goto done;
 	}
 
+	log_write(INFO, "num_rqst=%d total length=%u\n",
+			num_rqst, remaining_data_length);
+
 	rqst_idx = 0;
-
 next_rqst:
 	rqst = &rqst_array[rqst_idx];
 	iov = rqst->rq_iov;
-- 
2.22.0