nvmet-tcp: set MSG_SENDPAGE_NOTLAST with MSG_MORE when we have more to send

We can signal the stack that this is not the last page coming and the
stack can build a larger tso segment, so go ahead and use it.
Signed-off-by: NSagi Grimberg <sagi@grimberg.me>
Signed-off-by: NChristoph Hellwig <hch@lst.de>

drivers/nvme/target/tcp.c

@@ -510,7 +510,7 @@ static int nvmet_try_send_data_pdu(struct nvmet_tcp_cmd *cmd)
 
 	ret = kernel_sendpage(cmd->queue->sock, virt_to_page(cmd->data_pdu),
 			offset_in_page(cmd->data_pdu) + cmd->offset,
-			left, MSG_DONTWAIT | MSG_MORE);
+			left, MSG_DONTWAIT | MSG_MORE | MSG_SENDPAGE_NOTLAST);
 	if (ret <= 0)
 		return ret;
 
@@ -538,7 +538,7 @@ static int nvmet_try_send_data(struct nvmet_tcp_cmd *cmd, bool last_in_batch)
 		if ((!last_in_batch && cmd->queue->send_list_len) ||
 		    cmd->wbytes_done + left < cmd->req.transfer_len ||
 		    queue->data_digest || !queue->nvme_sq.sqhd_disabled)
-			flags |= MSG_MORE;
+			flags |= MSG_MORE | MSG_SENDPAGE_NOTLAST;
 
 		ret = kernel_sendpage(cmd->queue->sock, page, cmd->offset,
 					left, flags);
@@ -585,7 +585,7 @@ static int nvmet_try_send_response(struct nvmet_tcp_cmd *cmd,
 	int ret;
 
 	if (!last_in_batch && cmd->queue->send_list_len)
-		flags |= MSG_MORE;
+		flags |= MSG_MORE | MSG_SENDPAGE_NOTLAST;
 	else
 		flags |= MSG_EOR;
 
@@ -614,7 +614,7 @@ static int nvmet_try_send_r2t(struct nvmet_tcp_cmd *cmd, bool last_in_batch)
 	int ret;
 
 	if (!last_in_batch && cmd->queue->send_list_len)
-		flags |= MSG_MORE;
+		flags |= MSG_MORE | MSG_SENDPAGE_NOTLAST;
 	else
 		flags |= MSG_EOR;