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

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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: Long Li <longli@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
CC: Stable <stable@vger.kernel.org>
This commit is contained in:
Long Li 2019-04-15 14:49:17 -07:00 committed by Steve French
parent 46e6661963
commit 4739f23286
3 changed files with 32 additions and 30 deletions
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55
fs/cifs/smbdirect.c
View File

@ -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;
cifs_dbg(FYI, "Sending smb (RDMA): smb_len=%u\n", buflen);
for (i = 0; i < rqst->rq_nvec-1; i++)
next_rqst:
rqst = &rqst_array[rqst_idx];
iov = rqst->rq_iov;
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

5
fs/cifs/smbdirect.h
View File

@ -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

2
fs/cifs/transport.c
View File

@ -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;
}