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>

diff --git a/fs/cifs/smbdirect.c b/fs/cifs/smbdirect.c
index 05b05e7..251ef12 100644 (file)
--- 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

diff --git a/fs/cifs/smbdirect.h b/fs/cifs/smbdirect.h
index a3c7b3d..f6241b8 100644 (file)
--- 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,
@@ -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

diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c
index 65d9f3e..5c59c49 100644 (file)
--- 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;
        }