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Message-Id: <20180723143609.2242-2-toshiaki.makita1@gmail.com>
Date: Mon, 23 Jul 2018 23:36:04 +0900
From: Toshiaki Makita <toshiaki.makita1@...il.com>
To: "Michael S. Tsirkin" <mst@...hat.com>,
Jason Wang <jasowang@...hat.com>,
"David S. Miller" <davem@...emloft.net>
Cc: Toshiaki Makita <makita.toshiaki@....ntt.co.jp>,
netdev@...r.kernel.org, virtualization@...ts.linux-foundation.org
Subject: [PATCH net-next 1/6] virtio_net: Fix incosistent received bytes counter
From: Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
When received packets are dropped in virtio_net driver, received packets
counter is incremented but bytes counter is not.
As a result, for instance if we drop all packets by XDP, only received
is counted and bytes stays 0, which looks inconsistent.
IMHO received packets/bytes should be counted if packets are produced by
the hypervisor, like what common NICs on physical machines are doing.
So fix the bytes counter.
Signed-off-by: Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
---
drivers/net/virtio_net.c | 41 +++++++++++++++++++++++------------------
1 file changed, 23 insertions(+), 18 deletions(-)
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 2ff08bc103a9..abbd3bc83b62 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -586,7 +586,8 @@ static struct sk_buff *receive_small(struct net_device *dev,
struct receive_queue *rq,
void *buf, void *ctx,
unsigned int len,
- unsigned int *xdp_xmit)
+ unsigned int *xdp_xmit,
+ unsigned int *rbytes)
{
struct sk_buff *skb;
struct bpf_prog *xdp_prog;
@@ -601,6 +602,7 @@ static struct sk_buff *receive_small(struct net_device *dev,
int err;
len -= vi->hdr_len;
+ *rbytes += len;
rcu_read_lock();
xdp_prog = rcu_dereference(rq->xdp_prog);
@@ -705,11 +707,13 @@ static struct sk_buff *receive_big(struct net_device *dev,
struct virtnet_info *vi,
struct receive_queue *rq,
void *buf,
- unsigned int len)
+ unsigned int len,
+ unsigned int *rbytes)
{
struct page *page = buf;
struct sk_buff *skb = page_to_skb(vi, rq, page, 0, len, PAGE_SIZE);
+ *rbytes += len - vi->hdr_len;
if (unlikely(!skb))
goto err;
@@ -727,7 +731,8 @@ static struct sk_buff *receive_mergeable(struct net_device *dev,
void *buf,
void *ctx,
unsigned int len,
- unsigned int *xdp_xmit)
+ unsigned int *xdp_xmit,
+ unsigned int *rbytes)
{
struct virtio_net_hdr_mrg_rxbuf *hdr = buf;
u16 num_buf = virtio16_to_cpu(vi->vdev, hdr->num_buffers);
@@ -740,6 +745,7 @@ static struct sk_buff *receive_mergeable(struct net_device *dev,
int err;
head_skb = NULL;
+ *rbytes += len - vi->hdr_len;
rcu_read_lock();
xdp_prog = rcu_dereference(rq->xdp_prog);
@@ -877,6 +883,7 @@ static struct sk_buff *receive_mergeable(struct net_device *dev,
goto err_buf;
}
+ *rbytes += len;
page = virt_to_head_page(buf);
truesize = mergeable_ctx_to_truesize(ctx);
@@ -932,6 +939,7 @@ static struct sk_buff *receive_mergeable(struct net_device *dev,
dev->stats.rx_length_errors++;
break;
}
+ *rbytes += len;
page = virt_to_head_page(buf);
put_page(page);
}
@@ -942,14 +950,13 @@ static struct sk_buff *receive_mergeable(struct net_device *dev,
return NULL;
}
-static int receive_buf(struct virtnet_info *vi, struct receive_queue *rq,
- void *buf, unsigned int len, void **ctx,
- unsigned int *xdp_xmit)
+static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq,
+ void *buf, unsigned int len, void **ctx,
+ unsigned int *xdp_xmit, unsigned int *rbytes)
{
struct net_device *dev = vi->dev;
struct sk_buff *skb;
struct virtio_net_hdr_mrg_rxbuf *hdr;
- int ret;
if (unlikely(len < vi->hdr_len + ETH_HLEN)) {
pr_debug("%s: short packet %i\n", dev->name, len);
@@ -961,23 +968,22 @@ static int receive_buf(struct virtnet_info *vi, struct receive_queue *rq,
} else {
put_page(virt_to_head_page(buf));
}
- return 0;
+ return;
}
if (vi->mergeable_rx_bufs)
- skb = receive_mergeable(dev, vi, rq, buf, ctx, len, xdp_xmit);
+ skb = receive_mergeable(dev, vi, rq, buf, ctx, len, xdp_xmit,
+ rbytes);
else if (vi->big_packets)
- skb = receive_big(dev, vi, rq, buf, len);
+ skb = receive_big(dev, vi, rq, buf, len, rbytes);
else
- skb = receive_small(dev, vi, rq, buf, ctx, len, xdp_xmit);
+ skb = receive_small(dev, vi, rq, buf, ctx, len, xdp_xmit, rbytes);
if (unlikely(!skb))
- return 0;
+ return;
hdr = skb_vnet_hdr(skb);
- ret = skb->len;
-
if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID)
skb->ip_summed = CHECKSUM_UNNECESSARY;
@@ -994,12 +1000,11 @@ static int receive_buf(struct virtnet_info *vi, struct receive_queue *rq,
ntohs(skb->protocol), skb->len, skb->pkt_type);
napi_gro_receive(&rq->napi, skb);
- return ret;
+ return;
frame_err:
dev->stats.rx_frame_errors++;
dev_kfree_skb(skb);
- return 0;
}
/* Unlike mergeable buffers, all buffers are allocated to the
@@ -1249,13 +1254,13 @@ static int virtnet_receive(struct receive_queue *rq, int budget,
while (received < budget &&
(buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx))) {
- bytes += receive_buf(vi, rq, buf, len, ctx, xdp_xmit);
+ receive_buf(vi, rq, buf, len, ctx, xdp_xmit, &bytes);
received++;
}
} else {
while (received < budget &&
(buf = virtqueue_get_buf(rq->vq, &len)) != NULL) {
- bytes += receive_buf(vi, rq, buf, len, NULL, xdp_xmit);
+ receive_buf(vi, rq, buf, len, NULL, xdp_xmit, &bytes);
received++;
}
}
--
2.14.3
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