* [PATCH] xen-netfront: reset skb transport header before checksum
@ 2015-05-12 1:34 Venkat Venkatsubra
2015-05-12 1:51 ` Eric Dumazet
2015-05-12 1:51 ` Eric Dumazet
0 siblings, 2 replies; 6+ messages in thread
From: Venkat Venkatsubra @ 2015-05-12 1:34 UTC (permalink / raw)
To: netdev, xen-devel
Cc: davem, david.vrabel, konrad.wilk, boris.ostrovsky, wei.liu2,
paul.durrant
In ed1f50c3a ("net: add skb_checksum_setup") some checksum functions
were introduced in core. Subsequent change b5cf66cd1 ("xen-netfront:
use new skb_checksum_setup function") made use of those functions to
replace its own implementation. With that change ip_hdr() and tcp_hdr()
were not pointing at the right place. d554f73df ("xen-netfront: reset
skb network header before checksum") fixed the ip_hdr().
This patch fixes tcp_hdr().
We saw this problem when LRO was enabled on the host and it results in
netfront setting skb->ip_summed to CHECKSUM_UNNECESSARY.
Signed-off-by: Venkat Venkatsubra <venkat.x.venkatsubra@oracle.com>
---
drivers/net/xen-netfront.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index 3f45afd..ed5c242 100644
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -889,6 +889,7 @@ static int handle_incoming_queue(struct netfront_queue *queue,
/* Ethernet work: Delayed to here as it peeks the header. */
skb->protocol = eth_type_trans(skb, queue->info->netdev);
skb_reset_network_header(skb);
+ skb_set_transport_header(skb, ip_hdrlen(skb));
if (checksum_setup(queue->info->netdev, skb)) {
kfree_skb(skb);
--
1.8.2.1
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH] xen-netfront: reset skb transport header before checksum
2015-05-12 1:34 [PATCH] xen-netfront: reset skb transport header before checksum Venkat Venkatsubra
@ 2015-05-12 1:51 ` Eric Dumazet
2015-05-12 14:00 ` Venkat Venkatsubra
2015-05-12 14:00 ` Venkat Venkatsubra
2015-05-12 1:51 ` Eric Dumazet
1 sibling, 2 replies; 6+ messages in thread
From: Eric Dumazet @ 2015-05-12 1:51 UTC (permalink / raw)
To: Venkat Venkatsubra
Cc: netdev, xen-devel, davem, david.vrabel, konrad.wilk,
boris.ostrovsky, wei.liu2, paul.durrant
On Mon, 2015-05-11 at 18:34 -0700, Venkat Venkatsubra wrote:
> In ed1f50c3a ("net: add skb_checksum_setup") some checksum functions
> were introduced in core. Subsequent change b5cf66cd1 ("xen-netfront:
> use new skb_checksum_setup function") made use of those functions to
> replace its own implementation. With that change ip_hdr() and tcp_hdr()
> were not pointing at the right place. d554f73df ("xen-netfront: reset
> skb network header before checksum") fixed the ip_hdr().
>
> This patch fixes tcp_hdr().
>
> We saw this problem when LRO was enabled on the host and it results in
> netfront setting skb->ip_summed to CHECKSUM_UNNECESSARY.
>
> Signed-off-by: Venkat Venkatsubra <venkat.x.venkatsubra@oracle.com>
> ---
> drivers/net/xen-netfront.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
> index 3f45afd..ed5c242 100644
> --- a/drivers/net/xen-netfront.c
> +++ b/drivers/net/xen-netfront.c
> @@ -889,6 +889,7 @@ static int handle_incoming_queue(struct netfront_queue *queue,
> /* Ethernet work: Delayed to here as it peeks the header. */
> skb->protocol = eth_type_trans(skb, queue->info->netdev);
> skb_reset_network_header(skb);
> + skb_set_transport_header(skb, ip_hdrlen(skb));
>
> if (checksum_setup(queue->info->netdev, skb)) {
> kfree_skb(skb);
This looks bogus for IPv6.
I would rather fix skb_checksum_setup_ip() and
skb_checksum_setup_ipv6(), since you already use correctly
skb_maybe_pull_tail() there.
In general, setting network and transport header at this point seems
extra work.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] xen-netfront: reset skb transport header before checksum
2015-05-12 1:34 [PATCH] xen-netfront: reset skb transport header before checksum Venkat Venkatsubra
2015-05-12 1:51 ` Eric Dumazet
@ 2015-05-12 1:51 ` Eric Dumazet
1 sibling, 0 replies; 6+ messages in thread
From: Eric Dumazet @ 2015-05-12 1:51 UTC (permalink / raw)
To: Venkat Venkatsubra
Cc: wei.liu2, netdev, paul.durrant, david.vrabel, xen-devel,
boris.ostrovsky, davem
On Mon, 2015-05-11 at 18:34 -0700, Venkat Venkatsubra wrote:
> In ed1f50c3a ("net: add skb_checksum_setup") some checksum functions
> were introduced in core. Subsequent change b5cf66cd1 ("xen-netfront:
> use new skb_checksum_setup function") made use of those functions to
> replace its own implementation. With that change ip_hdr() and tcp_hdr()
> were not pointing at the right place. d554f73df ("xen-netfront: reset
> skb network header before checksum") fixed the ip_hdr().
>
> This patch fixes tcp_hdr().
>
> We saw this problem when LRO was enabled on the host and it results in
> netfront setting skb->ip_summed to CHECKSUM_UNNECESSARY.
>
> Signed-off-by: Venkat Venkatsubra <venkat.x.venkatsubra@oracle.com>
> ---
> drivers/net/xen-netfront.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
> index 3f45afd..ed5c242 100644
> --- a/drivers/net/xen-netfront.c
> +++ b/drivers/net/xen-netfront.c
> @@ -889,6 +889,7 @@ static int handle_incoming_queue(struct netfront_queue *queue,
> /* Ethernet work: Delayed to here as it peeks the header. */
> skb->protocol = eth_type_trans(skb, queue->info->netdev);
> skb_reset_network_header(skb);
> + skb_set_transport_header(skb, ip_hdrlen(skb));
>
> if (checksum_setup(queue->info->netdev, skb)) {
> kfree_skb(skb);
This looks bogus for IPv6.
I would rather fix skb_checksum_setup_ip() and
skb_checksum_setup_ipv6(), since you already use correctly
skb_maybe_pull_tail() there.
In general, setting network and transport header at this point seems
extra work.
^ permalink raw reply [flat|nested] 6+ messages in thread
* RE: [PATCH] xen-netfront: reset skb transport header before checksum
2015-05-12 1:51 ` Eric Dumazet
@ 2015-05-12 14:00 ` Venkat Venkatsubra
2015-05-12 14:00 ` Venkat Venkatsubra
1 sibling, 0 replies; 6+ messages in thread
From: Venkat Venkatsubra @ 2015-05-12 14:00 UTC (permalink / raw)
To: Eric Dumazet
Cc: netdev, xen-devel, davem, david.vrabel, Konrad Wilk,
Boris Ostrovsky, wei.liu2, paul.durrant
>
> This looks bogus for IPv6.
>
> I would rather fix skb_checksum_setup_ip() and
> skb_checksum_setup_ipv6(), since you already use correctly
> skb_maybe_pull_tail() there.
>
> In general, setting network and transport header at this point seems
> extra work.
>
Yes, I missed the IPv6 case. ;-) Thanks Eric for pointing that out.
Looking further the below commit might have already resolved the issue.
commit e5d5decaedf41f5b03e6819789cc3ba8744d9f54
Author: Jason Wang <jasowang@redhat.com>
Date: Tue Mar 26 23:11:20 2013 +0000
net: core: let skb_partial_csum_set() set transport header
For untrusted packets with partial checksum, we need to set the transport he
for precise packet length estimation. We can just let skb_pratial_csum_set()
do this to avoid extra call to skb_flow_dissect() and simplify the caller.
Cc: Eric Dumazet <edumazet@google.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
The guest we were running was older to this and didn't have the above commit.
Thanks.
Venkat
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] xen-netfront: reset skb transport header before checksum
2015-05-12 1:51 ` Eric Dumazet
2015-05-12 14:00 ` Venkat Venkatsubra
@ 2015-05-12 14:00 ` Venkat Venkatsubra
1 sibling, 0 replies; 6+ messages in thread
From: Venkat Venkatsubra @ 2015-05-12 14:00 UTC (permalink / raw)
To: Eric Dumazet
Cc: wei.liu2, netdev, paul.durrant, david.vrabel, xen-devel,
Boris Ostrovsky, davem
>
> This looks bogus for IPv6.
>
> I would rather fix skb_checksum_setup_ip() and
> skb_checksum_setup_ipv6(), since you already use correctly
> skb_maybe_pull_tail() there.
>
> In general, setting network and transport header at this point seems
> extra work.
>
Yes, I missed the IPv6 case. ;-) Thanks Eric for pointing that out.
Looking further the below commit might have already resolved the issue.
commit e5d5decaedf41f5b03e6819789cc3ba8744d9f54
Author: Jason Wang <jasowang@redhat.com>
Date: Tue Mar 26 23:11:20 2013 +0000
net: core: let skb_partial_csum_set() set transport header
For untrusted packets with partial checksum, we need to set the transport he
for precise packet length estimation. We can just let skb_pratial_csum_set()
do this to avoid extra call to skb_flow_dissect() and simplify the caller.
Cc: Eric Dumazet <edumazet@google.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
The guest we were running was older to this and didn't have the above commit.
Thanks.
Venkat
^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH] xen-netfront: reset skb transport header before checksum
@ 2015-05-12 1:34 Venkat Venkatsubra
0 siblings, 0 replies; 6+ messages in thread
From: Venkat Venkatsubra @ 2015-05-12 1:34 UTC (permalink / raw)
To: netdev, xen-devel
Cc: wei.liu2, paul.durrant, david.vrabel, boris.ostrovsky, davem
In ed1f50c3a ("net: add skb_checksum_setup") some checksum functions
were introduced in core. Subsequent change b5cf66cd1 ("xen-netfront:
use new skb_checksum_setup function") made use of those functions to
replace its own implementation. With that change ip_hdr() and tcp_hdr()
were not pointing at the right place. d554f73df ("xen-netfront: reset
skb network header before checksum") fixed the ip_hdr().
This patch fixes tcp_hdr().
We saw this problem when LRO was enabled on the host and it results in
netfront setting skb->ip_summed to CHECKSUM_UNNECESSARY.
Signed-off-by: Venkat Venkatsubra <venkat.x.venkatsubra@oracle.com>
---
drivers/net/xen-netfront.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index 3f45afd..ed5c242 100644
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -889,6 +889,7 @@ static int handle_incoming_queue(struct netfront_queue *queue,
/* Ethernet work: Delayed to here as it peeks the header. */
skb->protocol = eth_type_trans(skb, queue->info->netdev);
skb_reset_network_header(skb);
+ skb_set_transport_header(skb, ip_hdrlen(skb));
if (checksum_setup(queue->info->netdev, skb)) {
kfree_skb(skb);
--
1.8.2.1
^ permalink raw reply related [flat|nested] 6+ messages in thread
end of thread, other threads:[~2015-05-12 14:00 UTC | newest]
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2015-05-12 1:34 [PATCH] xen-netfront: reset skb transport header before checksum Venkat Venkatsubra
2015-05-12 1:51 ` Eric Dumazet
2015-05-12 14:00 ` Venkat Venkatsubra
2015-05-12 14:00 ` Venkat Venkatsubra
2015-05-12 1:51 ` Eric Dumazet
2015-05-12 1:34 Venkat Venkatsubra
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