[PATCH net-next v4 2/3] vsock/virtio: add SIOCOUTQ support for all virtio based transports
From: Luigi Leonardi via B4 Relay
Date: Tue Jul 30 2024 - 15:43:59 EST
From: Luigi Leonardi <luigi.leonardi@xxxxxxxxxxx>
Introduce support for virtio_transport_unsent_bytes
ioctl for virtio_transport, vhost_vsock and vsock_loopback.
For all transports the unsent bytes counter is incremented
in virtio_transport_get_credit.
In virtio_transport (G2H) and in vhost-vsock (H2G) the counter
is decremented when the skbuff is consumed. In vsock_loopback the
same skbuff is passed from the transmitter to the receiver, so
the counter is decremented before queuing the skbuff to the
receiver.
Signed-off-by: Luigi Leonardi <luigi.leonardi@xxxxxxxxxxx>
---
drivers/vhost/vsock.c | 4 +++-
include/linux/virtio_vsock.h | 6 ++++++
net/vmw_vsock/virtio_transport.c | 4 +++-
net/vmw_vsock/virtio_transport_common.c | 35 +++++++++++++++++++++++++++++++++
net/vmw_vsock/vsock_loopback.c | 6 ++++++
5 files changed, 53 insertions(+), 2 deletions(-)
diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c
index bf664ec9341b..802153e23073 100644
--- a/drivers/vhost/vsock.c
+++ b/drivers/vhost/vsock.c
@@ -244,7 +244,7 @@ vhost_transport_do_send_pkt(struct vhost_vsock *vsock,
restart_tx = true;
}
- consume_skb(skb);
+ virtio_transport_consume_skb_sent(skb, true);
}
} while(likely(!vhost_exceeds_weight(vq, ++pkts, total_len)));
if (added)
@@ -451,6 +451,8 @@ static struct virtio_transport vhost_transport = {
.notify_buffer_size = virtio_transport_notify_buffer_size,
.notify_set_rcvlowat = virtio_transport_notify_set_rcvlowat,
+ .unsent_bytes = virtio_transport_unsent_bytes,
+
.read_skb = virtio_transport_read_skb,
},
diff --git a/include/linux/virtio_vsock.h b/include/linux/virtio_vsock.h
index c82089dee0c8..0387d64e2c66 100644
--- a/include/linux/virtio_vsock.h
+++ b/include/linux/virtio_vsock.h
@@ -133,6 +133,7 @@ struct virtio_vsock_sock {
u32 tx_cnt;
u32 peer_fwd_cnt;
u32 peer_buf_alloc;
+ size_t bytes_unsent;
/* Protected by rx_lock */
u32 fwd_cnt;
@@ -193,6 +194,11 @@ s64 virtio_transport_stream_has_data(struct vsock_sock *vsk);
s64 virtio_transport_stream_has_space(struct vsock_sock *vsk);
u32 virtio_transport_seqpacket_has_data(struct vsock_sock *vsk);
+ssize_t virtio_transport_unsent_bytes(struct vsock_sock *vsk);
+
+void virtio_transport_consume_skb_sent(struct sk_buff *skb,
+ bool consume);
+
int virtio_transport_do_socket_init(struct vsock_sock *vsk,
struct vsock_sock *psk);
int
diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c
index 64a07acfef12..e0160da4ef43 100644
--- a/net/vmw_vsock/virtio_transport.c
+++ b/net/vmw_vsock/virtio_transport.c
@@ -311,7 +311,7 @@ static void virtio_transport_tx_work(struct work_struct *work)
virtqueue_disable_cb(vq);
while ((skb = virtqueue_get_buf(vq, &len)) != NULL) {
- consume_skb(skb);
+ virtio_transport_consume_skb_sent(skb, true);
added = true;
}
} while (!virtqueue_enable_cb(vq));
@@ -540,6 +540,8 @@ static struct virtio_transport virtio_transport = {
.notify_buffer_size = virtio_transport_notify_buffer_size,
.notify_set_rcvlowat = virtio_transport_notify_set_rcvlowat,
+ .unsent_bytes = virtio_transport_unsent_bytes,
+
.read_skb = virtio_transport_read_skb,
},
diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c
index 16ff976a86e3..884ee128851e 100644
--- a/net/vmw_vsock/virtio_transport_common.c
+++ b/net/vmw_vsock/virtio_transport_common.c
@@ -463,6 +463,26 @@ void virtio_transport_inc_tx_pkt(struct virtio_vsock_sock *vvs, struct sk_buff *
}
EXPORT_SYMBOL_GPL(virtio_transport_inc_tx_pkt);
+void virtio_transport_consume_skb_sent(struct sk_buff *skb, bool consume)
+{
+ struct sock *s = skb->sk;
+
+ if (s && skb->len) {
+ struct vsock_sock *vs = vsock_sk(s);
+ struct virtio_vsock_sock *vvs;
+
+ vvs = vs->trans;
+
+ spin_lock_bh(&vvs->tx_lock);
+ vvs->bytes_unsent -= skb->len;
+ spin_unlock_bh(&vvs->tx_lock);
+ }
+
+ if (consume)
+ consume_skb(skb);
+}
+EXPORT_SYMBOL_GPL(virtio_transport_consume_skb_sent);
+
u32 virtio_transport_get_credit(struct virtio_vsock_sock *vvs, u32 credit)
{
u32 ret;
@@ -475,6 +495,7 @@ u32 virtio_transport_get_credit(struct virtio_vsock_sock *vvs, u32 credit)
if (ret > credit)
ret = credit;
vvs->tx_cnt += ret;
+ vvs->bytes_unsent += ret;
spin_unlock_bh(&vvs->tx_lock);
return ret;
@@ -488,6 +509,7 @@ void virtio_transport_put_credit(struct virtio_vsock_sock *vvs, u32 credit)
spin_lock_bh(&vvs->tx_lock);
vvs->tx_cnt -= credit;
+ vvs->bytes_unsent -= credit;
spin_unlock_bh(&vvs->tx_lock);
}
EXPORT_SYMBOL_GPL(virtio_transport_put_credit);
@@ -1090,6 +1112,19 @@ void virtio_transport_destruct(struct vsock_sock *vsk)
}
EXPORT_SYMBOL_GPL(virtio_transport_destruct);
+ssize_t virtio_transport_unsent_bytes(struct vsock_sock *vsk)
+{
+ struct virtio_vsock_sock *vvs = vsk->trans;
+ size_t ret;
+
+ spin_lock_bh(&vvs->tx_lock);
+ ret = vvs->bytes_unsent;
+ spin_unlock_bh(&vvs->tx_lock);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(virtio_transport_unsent_bytes);
+
static int virtio_transport_reset(struct vsock_sock *vsk,
struct sk_buff *skb)
{
diff --git a/net/vmw_vsock/vsock_loopback.c b/net/vmw_vsock/vsock_loopback.c
index 6dea6119f5b2..6e78927a598e 100644
--- a/net/vmw_vsock/vsock_loopback.c
+++ b/net/vmw_vsock/vsock_loopback.c
@@ -98,6 +98,8 @@ static struct virtio_transport loopback_transport = {
.notify_buffer_size = virtio_transport_notify_buffer_size,
.notify_set_rcvlowat = virtio_transport_notify_set_rcvlowat,
+ .unsent_bytes = virtio_transport_unsent_bytes,
+
.read_skb = virtio_transport_read_skb,
},
@@ -123,6 +125,10 @@ static void vsock_loopback_work(struct work_struct *work)
spin_unlock_bh(&vsock->pkt_queue.lock);
while ((skb = __skb_dequeue(&pkts))) {
+ /* Decrement the bytes_unsent counter without deallocating skb
+ * It is freed by the receiver.
+ */
+ virtio_transport_consume_skb_sent(skb, false);
virtio_transport_deliver_tap_pkt(skb);
virtio_transport_recv_pkt(&loopback_transport, skb);
}
--
2.45.2