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authorLong Li <longli@microsoft.com>2019-04-15 23:49:17 +0200
committerSteve French <stfrench@microsoft.com>2019-05-08 06:24:55 +0200
commit4739f2328661d070f93f9bcc8afb2a82706c826d (patch)
tree17b12780ba55f25a866e414fda77d0410b606694 /fs/cifs/smbdirect.c
parentSMB3: Add handling for different FSCTL access flags (diff)
downloadlinux-4739f2328661d070f93f9bcc8afb2a82706c826d.tar.xz
linux-4739f2328661d070f93f9bcc8afb2a82706c826d.zip
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: Long Li <longli@microsoft.com> Signed-off-by: Steve French <stfrench@microsoft.com> CC: Stable <stable@vger.kernel.org>
Diffstat (limited to 'fs/cifs/smbdirect.c')
-rw-r--r--fs/cifs/smbdirect.c55
1 files changed, 28 insertions, 27 deletions
diff --git a/fs/cifs/smbdirect.c b/fs/cifs/smbdirect.c
index 05b05e78f31b..251ef1223206 100644
--- a/fs/cifs/smbdirect.c
+++ b/fs/cifs/smbdirect.c
@@ -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;
@@ -2084,6 +2085,8 @@ 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;
@@ -2091,46 +2094,40 @@ int smbd_send(struct TCP_Server_Info *server, struct smb_rqst *rqst)
}
/*
- * 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