nvme-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: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>

diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c
index c79e248..7c7c188 100644 (file)
--- a/drivers/nvme/host/tcp.c
+++ b/drivers/nvme/host/tcp.c
@@ -885,7 +885,7 @@ static int nvme_tcp_try_send_data(struct nvme_tcp_request *req)
                if (last && !queue->data_digest)
                        flags |= MSG_EOR;
                else
-                       flags |= MSG_MORE;
+                       flags |= MSG_MORE | MSG_SENDPAGE_NOTLAST;
 
                /* can't zcopy slab pages */
                if (unlikely(PageSlab(page))) {
@@ -924,11 +924,16 @@ static int nvme_tcp_try_send_cmd_pdu(struct nvme_tcp_request *req)
        struct nvme_tcp_queue *queue = req->queue;
        struct nvme_tcp_cmd_pdu *pdu = req->pdu;
        bool inline_data = nvme_tcp_has_inline_data(req);
-       int flags = MSG_DONTWAIT | (inline_data ? MSG_MORE : MSG_EOR);
        u8 hdgst = nvme_tcp_hdgst_len(queue);
        int len = sizeof(*pdu) + hdgst - req->offset;
+       int flags = MSG_DONTWAIT;
        int ret;
 
+       if (inline_data)
+               flags |= MSG_MORE | MSG_SENDPAGE_NOTLAST;
+       else
+               flags |= MSG_EOR;
+
        if (queue->hdr_digest && !req->offset)
                nvme_tcp_hdgst(queue->snd_hash, pdu, sizeof(*pdu));
 
@@ -967,7 +972,7 @@ static int nvme_tcp_try_send_data_pdu(struct nvme_tcp_request *req)
 
        ret = kernel_sendpage(queue->sock, virt_to_page(pdu),
                        offset_in_page(pdu) + req->offset, len,
-                       MSG_DONTWAIT | MSG_MORE);
+                       MSG_DONTWAIT | MSG_MORE | MSG_SENDPAGE_NOTLAST);
        if (unlikely(ret <= 0))
                return ret;