Commit 4739f232 authored by Long Li's avatar Long Li Committed by Steve French
Browse files

cifs: smbd: take an array of reqeusts when sending upper layer data 



To support compounding, __smb_send_rqst() now sends an array of requests to
the transport layer.
Change smbd_send() to take an array of requests, and send them in as few
packets as possible.

Signed-off-by: default avatarLong Li <longli@microsoft.com>
Signed-off-by: default avatarSteve French <stfrench@microsoft.com>
CC: Stable <stable@vger.kernel.org>
parent 46e66619

fs/cifs/smbdirect.c

+28 −27
Original line number Diff line number Diff line
@@ -2072,7 +2072,8 @@ out: 
 * rqst: the data to write

 * return value: 0 if successfully write, otherwise error code

 */

int smbd_send(struct TCP_Server_Info *server, struct smb_rqst *rqst)

int smbd_send(struct TCP_Server_Info *server,

	int num_rqst, struct smb_rqst *rqst_array)

{

	struct smbd_connection *info = server->smbd_conn;

	struct kvec vec;
@@ -2084,53 +2085,49 @@ int smbd_send(struct TCP_Server_Info *server, struct smb_rqst *rqst) 
		info->max_send_size - sizeof(struct smbd_data_transfer);

	struct kvec *iov;

	int rc;

	struct smb_rqst *rqst;

	int rqst_idx;



	if (info->transport_status != SMBD_CONNECTED) {

		rc = -EAGAIN;

		goto done;

	}



	/*

	 * Skip the RFC1002 length defined in MS-SMB2 section 2.1

	 * It is used only for TCP transport in the iov[0]

	 * In future we may want to add a transport layer under protocol

	 * layer so this will only be issued to TCP transport

	 */



	if (rqst->rq_iov[0].iov_len != 4) {

		log_write(ERR, "expected the pdu length in 1st iov, but got %zu\n", rqst->rq_iov[0].iov_len);

		return -EINVAL;

	}



	/*

	 * 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

	 */

	buflen = smb_rqst_len(server, rqst);

	remaining_data_length = 0;

	for (i = 0; i < num_rqst; i++)

		remaining_data_length += smb_rqst_len(server, &rqst_array[i]);



	if (buflen + sizeof(struct smbd_data_transfer) >

	if (remaining_data_length + sizeof(struct smbd_data_transfer) >

		info->max_fragmented_send_size) {

		log_write(ERR, "payload size %d > max size %d\n",

			buflen, info->max_fragmented_send_size);

			remaining_data_length, info->max_fragmented_send_size);

		rc = -EINVAL;

		goto done;

	}



	iov = &rqst->rq_iov[1];

	rqst_idx = 0;



next_rqst:

	rqst = &rqst_array[rqst_idx];

	iov = rqst->rq_iov;



	cifs_dbg(FYI, "Sending smb (RDMA): smb_len=%u\n", buflen);

	for (i = 0; i < rqst->rq_nvec-1; i++)

	cifs_dbg(FYI, "Sending smb (RDMA): idx=%d smb_len=%lu\n",

		rqst_idx, smb_rqst_len(server, rqst));

	for (i = 0; i < rqst->rq_nvec; i++)

		dump_smb(iov[i].iov_base, iov[i].iov_len);



	remaining_data_length = buflen;



	log_write(INFO, "rqst->rq_nvec=%d rqst->rq_npages=%d rq_pagesz=%d "

		"rq_tailsz=%d buflen=%d\n",

		rqst->rq_nvec, rqst->rq_npages, rqst->rq_pagesz,

		rqst->rq_tailsz, buflen);

	log_write(INFO, "rqst_idx=%d nvec=%d rqst->rq_npages=%d rq_pagesz=%d "

		"rq_tailsz=%d buflen=%lu\n",

		rqst_idx, rqst->rq_nvec, rqst->rq_npages, rqst->rq_pagesz,

		rqst->rq_tailsz, smb_rqst_len(server, rqst));



	start = i = iov[0].iov_len ? 0 : 1;

	start = i = 0;

	buflen = 0;

	while (true) {

		buflen += iov[i].iov_len;
@@ -2178,14 +2175,14 @@ int smbd_send(struct TCP_Server_Info *server, struct smb_rqst *rqst) 
						goto done;

				}

				i++;

				if (i == rqst->rq_nvec-1)

				if (i == rqst->rq_nvec)

					break;

			}

			start = i;

			buflen = 0;

		} else {

			i++;

			if (i == rqst->rq_nvec-1) {

			if (i == rqst->rq_nvec) {

				/* send out all remaining vecs */

				remaining_data_length -= buflen;

				log_write(INFO,
@@ -2229,6 +2226,10 @@ int smbd_send(struct TCP_Server_Info *server, struct smb_rqst *rqst) 
		}

	}



	rqst_idx++;

	if (rqst_idx < num_rqst)

		goto next_rqst;



done:

	/*

	 * As an optimization, we don't wait for individual I/O to finish

fs/cifs/smbdirect.h

+3 −2
Original line number Diff line number Diff line
@@ -284,7 +284,8 @@ void smbd_destroy(struct TCP_Server_Info *server); 


/* Interface for carrying upper layer I/O through send/recv */

int smbd_recv(struct smbd_connection *info, struct msghdr *msg);

int smbd_send(struct TCP_Server_Info *server, struct smb_rqst *rqst);

int smbd_send(struct TCP_Server_Info *server,

	int num_rqst, struct smb_rqst *rqst);



enum mr_state {

	MR_READY,
@@ -324,7 +325,7 @@ static inline void *smbd_get_connection( 
static inline int smbd_reconnect(struct TCP_Server_Info *server) {return -1; }

static inline void smbd_destroy(struct TCP_Server_Info *server) {}

static inline int smbd_recv(struct smbd_connection *info, struct msghdr *msg) {return -1; }

static inline int smbd_send(struct TCP_Server_Info *server, struct smb_rqst *rqst) {return -1; }

static inline int smbd_send(struct TCP_Server_Info *server, int num_rqst, struct smb_rqst *rqst) {return -1; }

#endif



#endif

fs/cifs/transport.c

+1 −1
Original line number Diff line number Diff line
@@ -319,7 +319,7 @@ __smb_send_rqst(struct TCP_Server_Info *server, int num_rqst, 
	__be32 rfc1002_marker;



	if (cifs_rdma_enabled(server) && server->smbd_conn) {

		rc = smbd_send(server, rqst);

		rc = smbd_send(server, num_rqst, rqst);

		goto smbd_done;

	}

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