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Subject[RFC PATCH 06/09] Change RDMA recv to support offset in the 1st page
Date
From: Long Li <longli@microsoft.com>

The actaul data buffer may start with an offset in the 1st page, modify RDMA recv
function to read the data to the correct buffer.

Signed-off-by: Long Li <longli@microsoft.com>
---
fs/cifs/smbdirect.c | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/fs/cifs/smbdirect.c b/fs/cifs/smbdirect.c
index b46586d..939c289 100644
--- a/fs/cifs/smbdirect.c
+++ b/fs/cifs/smbdirect.c
@@ -1978,7 +1978,7 @@ static int smbd_recv_buf(struct smbd_connection *info, char *buf,
* return value: actual data read
*/
static int smbd_recv_page(struct smbd_connection *info,
- struct page *page, unsigned int to_read)
+ struct page *page, unsigned int page_offset, unsigned int to_read)
{
int ret;
char *to_address;
@@ -1989,10 +1989,10 @@ static int smbd_recv_page(struct smbd_connection *info,
info->reassembly_data_length >= to_read ||
info->transport_status != SMBD_CONNECTED);
if (ret)
- return 0;
+ return ret;

/* now we can read from reassembly queue and not sleep */
- to_address = kmap_atomic(page);
+ to_address = (char *) kmap_atomic(page) + page_offset;

log_read(INFO, "reading from page=%p address=%p to_read=%d\n",
page, to_address, to_read);
@@ -2012,7 +2012,7 @@ int smbd_recv(struct smbd_connection *info, struct msghdr *msg)
{
char *buf;
struct page *page;
- unsigned int to_read;
+ unsigned int to_read, page_offset;
int rc;

switch (msg->msg_iter.type) {
@@ -2024,15 +2024,16 @@ int smbd_recv(struct smbd_connection *info, struct msghdr *msg)

case READ | ITER_BVEC:
page = msg->msg_iter.bvec->bv_page;
+ page_offset = msg->msg_iter.bvec->bv_offset;
to_read = msg->msg_iter.bvec->bv_len;
- rc = smbd_recv_page(info, page, to_read);
+ rc = smbd_recv_page(info, page, page_offset, to_read);
break;

default:
/* It's a bug in upper layer to get there */
cifs_dbg(VFS, "CIFS: invalid msg type %d\n",
msg->msg_iter.type);
- rc = -EIO;
+ rc = -EINVAL;
}

/* SMBDirect will read it all or nothing */
--
2.7.4
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