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Subject[PATCH] cifs: smbd: take an array of reqeusts when sending upper layer data
Date
From: Long Li <longli@microsoft.com>

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>
---
fs/cifs/smbdirect.c | 55 +++++++++++++++++++++++++++--------------------------
fs/cifs/smbdirect.h | 3 ++-
fs/cifs/transport.c | 2 +-
3 files changed, 31 insertions(+), 29 deletions(-)

diff --git a/fs/cifs/smbdirect.c b/fs/cifs/smbdirect.c
index b95354c..272bdf8 100644
--- a/fs/cifs/smbdirect.c
+++ b/fs/cifs/smbdirect.c
@@ -2075,7 +2075,8 @@ int smbd_recv(struct smbd_connection *info, struct msghdr *msg)
* 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;
@@ -2087,6 +2088,8 @@ 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;
@@ -2094,46 +2097,40 @@ 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;
@@ -2181,14 +2178,14 @@ 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,
@@ -2232,6 +2229,10 @@ 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
diff --git a/fs/cifs/smbdirect.h b/fs/cifs/smbdirect.h
index a3c7b3d..9ee7cbf 100644
--- a/fs/cifs/smbdirect.h
+++ b/fs/cifs/smbdirect.h
@@ -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,
diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c
index 65d9f3e..5c59c49 100644
--- a/fs/cifs/transport.c
+++ b/fs/cifs/transport.c
@@ -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;
}

--
2.7.4
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