Re: [PATCH v2 2/2] virtio-net: make all RX paths handle erors consistently
From: "Michael S. Tsirkin" Date: Thu, 28 Nov 2013 13:30:59 +0200 > receive mergeable now handles errors internally. > Do same for big and small packet paths, otherwise > the logic is too hard to follow. > > Signed-off-by: Michael S. Tsirkin > Acked-by: Jason Wang Applied and I fixed the subject text to use an underscore '_' instead of a dash '-' for "virtio_net: ". -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: [PATCH v2 2/2] virtio-net: make all RX paths handle erors consistently
From: Michael S. Tsirkin m...@redhat.com Date: Thu, 28 Nov 2013 13:30:59 +0200 receive mergeable now handles errors internally. Do same for big and small packet paths, otherwise the logic is too hard to follow. Signed-off-by: Michael S. Tsirkin m...@redhat.com Acked-by: Jason Wang jasow...@redhat.com Applied and I fixed the subject text to use an underscore '_' instead of a dash '-' for virtio_net: . -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
[PATCH v2 2/2] virtio-net: make all RX paths handle erors consistently
receive mergeable now handles errors internally.
Do same for big and small packet paths, otherwise
the logic is too hard to follow.
Signed-off-by: Michael S. Tsirkin
Acked-by: Jason Wang
---
I don't see a bug in current code but I think it's still
a good idea to queue this in 3.13, for consistency.
drivers/net/virtio_net.c | 54 +---
1 file changed, 37 insertions(+), 17 deletions(-)
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 5408de6..4b01946 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -299,6 +299,35 @@ static struct sk_buff *page_to_skb(struct receive_queue
*rq,
return skb;
}
+static struct sk_buff *receive_small(void *buf, unsigned int len)
+{
+ struct sk_buff * skb = buf;
+
+ len -= sizeof(struct virtio_net_hdr);
+ skb_trim(skb, len);
+
+ return skb;
+}
+
+static struct sk_buff *receive_big(struct net_device *dev,
+ struct receive_queue *rq,
+ void *buf,
+ unsigned int len)
+{
+ struct page *page = buf;
+ struct sk_buff *skb = page_to_skb(rq, page, 0, len, PAGE_SIZE);
+
+ if (unlikely(!skb))
+ goto err;
+
+ return skb;
+
+err:
+ dev->stats.rx_dropped++;
+ give_pages(rq, page);
+ return NULL;
+}
+
static struct sk_buff *receive_mergeable(struct net_device *dev,
struct receive_queue *rq,
void *buf,
@@ -392,7 +421,6 @@ static void receive_buf(struct receive_queue *rq, void
*buf, unsigned int len)
struct net_device *dev = vi->dev;
struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
struct sk_buff *skb;
- struct page *page;
struct skb_vnet_hdr *hdr;
if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) {
@@ -407,23 +435,15 @@ static void receive_buf(struct receive_queue *rq, void
*buf, unsigned int len)
return;
}
- if (!vi->mergeable_rx_bufs && !vi->big_packets) {
- skb = buf;
- len -= sizeof(struct virtio_net_hdr);
- skb_trim(skb, len);
- } else if (vi->mergeable_rx_bufs) {
+ if (vi->mergeable_rx_bufs)
skb = receive_mergeable(dev, rq, buf, len);
- if (unlikely(!skb))
- return;
- } else {
- page = buf;
- skb = page_to_skb(rq, page, 0, len, PAGE_SIZE);
- if (unlikely(!skb)) {
- dev->stats.rx_dropped++;
- give_pages(rq, page);
- return;
- }
- }
+ else if (vi->big_packets)
+ skb = receive_big(dev, rq, buf, len);
+ else
+ skb = receive_small(buf, len);
+
+ if (unlikely(!skb))
+ return;
hdr = skb_vnet_hdr(skb);
--
MST
--
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Please read the FAQ at http://www.tux.org/lkml/
[PATCH v2 2/2] virtio-net: make all RX paths handle erors consistently
receive mergeable now handles errors internally.
Do same for big and small packet paths, otherwise
the logic is too hard to follow.
Signed-off-by: Michael S. Tsirkin m...@redhat.com
Acked-by: Jason Wang jasow...@redhat.com
---
I don't see a bug in current code but I think it's still
a good idea to queue this in 3.13, for consistency.
drivers/net/virtio_net.c | 54 +---
1 file changed, 37 insertions(+), 17 deletions(-)
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 5408de6..4b01946 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -299,6 +299,35 @@ static struct sk_buff *page_to_skb(struct receive_queue
*rq,
return skb;
}
+static struct sk_buff *receive_small(void *buf, unsigned int len)
+{
+ struct sk_buff * skb = buf;
+
+ len -= sizeof(struct virtio_net_hdr);
+ skb_trim(skb, len);
+
+ return skb;
+}
+
+static struct sk_buff *receive_big(struct net_device *dev,
+ struct receive_queue *rq,
+ void *buf,
+ unsigned int len)
+{
+ struct page *page = buf;
+ struct sk_buff *skb = page_to_skb(rq, page, 0, len, PAGE_SIZE);
+
+ if (unlikely(!skb))
+ goto err;
+
+ return skb;
+
+err:
+ dev-stats.rx_dropped++;
+ give_pages(rq, page);
+ return NULL;
+}
+
static struct sk_buff *receive_mergeable(struct net_device *dev,
struct receive_queue *rq,
void *buf,
@@ -392,7 +421,6 @@ static void receive_buf(struct receive_queue *rq, void
*buf, unsigned int len)
struct net_device *dev = vi-dev;
struct virtnet_stats *stats = this_cpu_ptr(vi-stats);
struct sk_buff *skb;
- struct page *page;
struct skb_vnet_hdr *hdr;
if (unlikely(len sizeof(struct virtio_net_hdr) + ETH_HLEN)) {
@@ -407,23 +435,15 @@ static void receive_buf(struct receive_queue *rq, void
*buf, unsigned int len)
return;
}
- if (!vi-mergeable_rx_bufs !vi-big_packets) {
- skb = buf;
- len -= sizeof(struct virtio_net_hdr);
- skb_trim(skb, len);
- } else if (vi-mergeable_rx_bufs) {
+ if (vi-mergeable_rx_bufs)
skb = receive_mergeable(dev, rq, buf, len);
- if (unlikely(!skb))
- return;
- } else {
- page = buf;
- skb = page_to_skb(rq, page, 0, len, PAGE_SIZE);
- if (unlikely(!skb)) {
- dev-stats.rx_dropped++;
- give_pages(rq, page);
- return;
- }
- }
+ else if (vi-big_packets)
+ skb = receive_big(dev, rq, buf, len);
+ else
+ skb = receive_small(buf, len);
+
+ if (unlikely(!skb))
+ return;
hdr = skb_vnet_hdr(skb);
--
MST
--
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