linux-kernel - [PATCH RFC 12/13] vhost/vsock: switch to the buf API

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Message-ID: <20200602130543.578420-13-mst@redhat.com>
Date:   Tue, 2 Jun 2020 09:06:22 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     Eugenio Pérez <eperezma@...hat.com>,
        Jason Wang <jasowang@...hat.com>, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        Stefan Hajnoczi <stefanha@...hat.com>,
        Stefano Garzarella <sgarzare@...hat.com>
Subject: [PATCH RFC 12/13] vhost/vsock: switch to the buf API

A straight-forward conversion.

Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
---
 drivers/vhost/vsock.c | 30 ++++++++++++++++++------------
 1 file changed, 18 insertions(+), 12 deletions(-)

diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c
index fb4e944c4d0d..07d1fb340fb4 100644
--- a/drivers/vhost/vsock.c
+++ b/drivers/vhost/vsock.c
@@ -103,7 +103,8 @@ vhost_transport_do_send_pkt(struct vhost_vsock *vsock,
 		unsigned out, in;
 		size_t nbytes;
 		size_t iov_len, payload_len;
-		int head;
+		struct vhost_buf buf;
+		int ret;
 
 		spin_lock_bh(&vsock->send_pkt_list_lock);
 		if (list_empty(&vsock->send_pkt_list)) {
@@ -117,16 +118,17 @@ vhost_transport_do_send_pkt(struct vhost_vsock *vsock,
 		list_del_init(&pkt->list);
 		spin_unlock_bh(&vsock->send_pkt_list_lock);
 
-		head = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov),
-					 &out, &in, NULL, NULL);
-		if (head < 0) {
+		ret = vhost_get_avail_buf(vq, &buf,
+					  vq->iov, ARRAY_SIZE(vq->iov),
+					  &out, &in, NULL, NULL);
+		if (ret < 0) {
 			spin_lock_bh(&vsock->send_pkt_list_lock);
 			list_add(&pkt->list, &vsock->send_pkt_list);
 			spin_unlock_bh(&vsock->send_pkt_list_lock);
 			break;
 		}
 
-		if (head == vq->num) {
+		if (!ret) {
 			spin_lock_bh(&vsock->send_pkt_list_lock);
 			list_add(&pkt->list, &vsock->send_pkt_list);
 			spin_unlock_bh(&vsock->send_pkt_list_lock);
@@ -186,7 +188,8 @@ vhost_transport_do_send_pkt(struct vhost_vsock *vsock,
 		 */
 		virtio_transport_deliver_tap_pkt(pkt);
 
-		vhost_add_used(vq, head, sizeof(pkt->hdr) + payload_len);
+		buf.in_len = sizeof(pkt->hdr) + payload_len;
+		vhost_put_used_buf(vq, &buf);
 		added = true;
 
 		pkt->off += payload_len;
@@ -440,7 +443,8 @@ static void vhost_vsock_handle_tx_kick(struct vhost_work *work)
 	struct vhost_vsock *vsock = container_of(vq->dev, struct vhost_vsock,
 						 dev);
 	struct virtio_vsock_pkt *pkt;
-	int head, pkts = 0, total_len = 0;
+	int ret, pkts = 0, total_len = 0;
+	struct vhost_buf buf;
 	unsigned int out, in;
 	bool added = false;
 
@@ -461,12 +465,13 @@ static void vhost_vsock_handle_tx_kick(struct vhost_work *work)
 			goto no_more_replies;
 		}
 
-		head = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov),
-					 &out, &in, NULL, NULL);
-		if (head < 0)
+		ret = vhost_get_avail_buf(vq, &buf,
+					  vq->iov, ARRAY_SIZE(vq->iov),
+					  &out, &in, NULL, NULL);
+		if (ret < 0)
 			break;
 
-		if (head == vq->num) {
+		if (!ret) {
 			if (unlikely(vhost_enable_notify(&vsock->dev, vq))) {
 				vhost_disable_notify(&vsock->dev, vq);
 				continue;
@@ -494,7 +499,8 @@ static void vhost_vsock_handle_tx_kick(struct vhost_work *work)
 			virtio_transport_free_pkt(pkt);
 
 		len += sizeof(pkt->hdr);
-		vhost_add_used(vq, head, len);
+		buf.in_len = len;
+		vhost_put_used_buf(vq, &buf);
 		total_len += len;
 		added = true;
 	} while(likely(!vhost_exceeds_weight(vq, ++pkts, total_len)));
-- 
MST