[PATCH 2/2] cifs:smbd Use the correct DMA direction when sending data

[longli]

From: Long Li <lon...@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 <lon...@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