smb: client: split out smbd_ib_post_send()

This is like smb_direct_post_send() in the server
and will simplify porting the smbdirect_send_batch
and credit related logic from the server.

Cc: <stable@vger.kernel.org> # 6.18.x
Cc: Steve French <smfrench@gmail.com>
Cc: Tom Talpey <tom@talpey.com>
Cc: Long Li <longli@microsoft.com>
Cc: Namjae Jeon <linkinjeon@kernel.org>
Cc: linux-cifs@vger.kernel.org
Cc: samba-technical@lists.samba.org
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Steve French <stfrench@microsoft.com>

Author: metze-samba

fs/smb/client/smbdirect.c

@@ -1101,11 +1101,26 @@ static int manage_keep_alive_before_sending(struct smbdirect_socket *sc)
 	return 0;
 }
 
+static int smbd_ib_post_send(struct smbdirect_socket *sc,
+			     struct ib_send_wr *wr)
+{
+	int ret;
+
+	atomic_inc(&sc->send_io.pending.count);
+	ret = ib_post_send(sc->ib.qp, wr, NULL);
+	if (ret) {
+		pr_err("failed to post send: %d\n", ret);
+		smbd_disconnect_rdma_connection(sc);
+		ret = -EAGAIN;
+	}
+	return ret;
+}
+
 /* Post the send request */
 static int smbd_post_send(struct smbdirect_socket *sc,
 		struct smbdirect_send_io *request)
 {
-	int rc, i;
+	int i;
 
 	for (i = 0; i < request->num_sge; i++) {
 		log_rdma_send(INFO,
@@ -1126,15 +1141,7 @@ static int smbd_post_send(struct smbdirect_socket *sc,
 	request->wr.num_sge = request->num_sge;
 	request->wr.opcode = IB_WR_SEND;
 	request->wr.send_flags = IB_SEND_SIGNALED;
-
-	rc = ib_post_send(sc->ib.qp, &request->wr, NULL);
-	if (rc) {
-		log_rdma_send(ERR, "ib_post_send failed rc=%d\n", rc);
-		smbd_disconnect_rdma_connection(sc);
-		rc = -EAGAIN;
-	}
-
-	return rc;
+	return smbd_ib_post_send(sc, &request->wr);
 }
 
 static int wait_for_credits(struct smbdirect_socket *sc,
@@ -1280,12 +1287,6 @@ static int smbd_post_send_iter(struct smbdirect_socket *sc,
 		     le32_to_cpu(packet->data_length),
 		     le32_to_cpu(packet->remaining_data_length));
 
-	/*
-	 * Now that we got a local and a remote credit
-	 * we add us as pending
-	 */
-	atomic_inc(&sc->send_io.pending.count);
-
 	rc = smbd_post_send(sc, request);
 	if (!rc)
 		return 0;