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Subject[PATCH 2/2] cifs:smbd Use the correct DMA direction when sending data
Date
From: Long Li <longli@microsoft.com>

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>
---
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;
}

- rqst_idx = 0;
+ 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;
--
2.17.1
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