Commit b6903bcf authored by Long Li's avatar Long Li Committed by Steve French
Browse files

CIFS: SMBD: Support page offset in RDMA send 



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

Signed-off-by: default avatarLong Li <longli@microsoft.com>
Signed-off-by: default avatarSteve French <stfrench@microsoft.com>
parent e8157b27

fs/cifs/smbdirect.c

+19 −8
Original line number Diff line number Diff line
@@ -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);

		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;