netdev - [RFC PATCH v1 2/3] virtio/vsock: fix 'rx_bytes'/'fwd

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Message-ID: <0ec95196-7445-b183-022d-fd3e1e1a7529@sberdevices.ru>
Date:   Sat, 4 Mar 2023 01:01:34 +0300
From:   Arseniy Krasnov <avkrasnov@...rdevices.ru>
To:     Stefan Hajnoczi <stefanha@...hat.com>,
        Stefano Garzarella <sgarzare@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Bobby Eshleman <bobby.eshleman@...edance.com>
CC:     <kvm@...r.kernel.org>, <virtualization@...ts.linux-foundation.org>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <kernel@...rdevices.ru>, <oxffffaa@...il.com>,
        <avkrasnov@...rdevices.ru>
Subject: [RFC PATCH v1 2/3] virtio/vsock: fix 'rx_bytes'/'fwd_cnt' calculation

Substraction of 'skb->len' is redundant here: 'skb_headroom()' is delta
between 'data' and 'head' pointers, e.g. it is number of bytes returned
to user (of course accounting size of header). 'skb->len' is number of
bytes rest in buffer.

Fixes: 71dc9ec9ac7d ("virtio/vsock: replace virtio_vsock_pkt with sk_buff")
Signed-off-by: Arseniy Krasnov <AVKrasnov@...rdevices.ru>
---
 net/vmw_vsock/virtio_transport_common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c
index 77bb1cad8471..d80075e1db42 100644
--- a/net/vmw_vsock/virtio_transport_common.c
+++ b/net/vmw_vsock/virtio_transport_common.c
@@ -255,7 +255,7 @@ static void virtio_transport_dec_rx_pkt(struct virtio_vsock_sock *vvs,
 {
 	int len;
 
-	len = skb_headroom(skb) - sizeof(struct virtio_vsock_hdr) - skb->len;
+	len = skb_headroom(skb) - sizeof(struct virtio_vsock_hdr);
 
 	if (len < 0)
 		pr_emerg("Negative len %i\n", len);
-- 
2.25.1