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CIFS: SMBD: Support page offset in RDMA send

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The RDMA send function needs to look at offset in the request pages, and
send data starting from there.

Signed-off-by: Long Li <longli@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Long Li 2018-05-30 12:48:00 -07:00 committed by Steve French
parent e8157b2729
commit b6903bcf0a
1 changed files with 19 additions and 8 deletions
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27
fs/cifs/smbdirect.c
View File

@ -17,6 +17,7 @@
#include <linux/highmem.h>
#include "smbdirect.h"
#include "cifs_debug.h"
#include "cifsproto.h"
static struct smbd_response *get_empty_queue_buffer(
struct smbd_connection *info);
@ -2082,7 +2083,7 @@ int smbd_send(struct smbd_connection *info, struct smb_rqst *rqst)
struct kvec vec;
int nvecs;
int size;
int buflen = 0, remaining_data_length;
unsigned int buflen = 0, remaining_data_length;
int start, i, j;
int max_iov_size =
info->max_send_size - sizeof(struct smbd_data_transfer);
@ -2113,10 +2114,17 @@ int smbd_send(struct smbd_connection *info, struct smb_rqst *rqst)
buflen += iov[i].iov_len;
}
/* add in the page array if there is one */
/*
* Add in the page array if there is one. The caller needs to set
* rq_tailsz to PAGE_SIZE when the buffer has multiple pages and
* ends at page boundary
*/
if (rqst->rq_npages) {
buflen += rqst->rq_pagesz * (rqst->rq_npages - 1);
buflen += rqst->rq_tailsz;
if (rqst->rq_npages == 1)
buflen += rqst->rq_tailsz;
else
buflen += rqst->rq_pagesz * (rqst->rq_npages - 1) -
rqst->rq_offset + rqst->rq_tailsz;
}
if (buflen + sizeof(struct smbd_data_transfer) >
@ -2213,8 +2221,9 @@ int smbd_send(struct smbd_connection *info, struct smb_rqst *rqst)
/* now sending pages if there are any */
for (i = 0; i < rqst->rq_npages; i++) {
buflen = (i == rqst->rq_npages-1) ?
rqst->rq_tailsz : rqst->rq_pagesz;
unsigned int offset;
rqst_page_get_length(rqst, i, &buflen, &offset);
nvecs = (buflen + max_iov_size - 1) / max_iov_size;
log_write(INFO, "sending pages buflen=%d nvecs=%d\n",
buflen, nvecs);
@ -2225,9 +2234,11 @@ int smbd_send(struct smbd_connection *info, struct smb_rqst *rqst)
remaining_data_length -= size;
log_write(INFO, "sending pages i=%d offset=%d size=%d"
" remaining_data_length=%d\n",
i, j*max_iov_size, size, remaining_data_length);
i, j*max_iov_size+offset, size,
remaining_data_length);
rc = smbd_post_send_page(
info, rqst->rq_pages[i], j*max_iov_size,
info, rqst->rq_pages[i],
j*max_iov_size + offset,
size, remaining_data_length);
if (rc)
goto done;