On 04/27/2016 05:00 PM, Hannes Frederic Sowa wrote:
Hi Ben,
On Wed, Apr 27, 2016, at 20:07, Ben Hutchings wrote:
On Wed, 2016-04-27 at 08:59 -0700, Ben Greear wrote:
On 04/26/2016 04:02 PM, Ben Hutchings wrote:
3.2.80-rc1 review patch. If anyone has any objections, please let me know.
I would be careful about this. It causes regressions when sending
PACKET_SOCKET buffers from user-space to veth devices.
There was a proposed upstream fix for the regression, but it has not gone
into the tree as far as I know.
http://www.spinics.net/lists/netdev/msg370436.html
[...]
OK, I'll drop this for now.
The fall out from not having this patch is in my opinion a bigger
fallout than not having this patch. This patch fixes silent data
corruption vs. the problem Ben Greear is talking about, which might not
be that a common usage.
What do others think?
Bye,
Hannes
This patch from Cong Wang seems to fix the regression for me, I think it should be added and
tested in the main tree, and then apply them to stable as a pair.
http://dmz2.candelatech.com/?p=linux-4.4.dev.y/.git;a=commitdiff;h=8153e983c0e5eba1aafe1fc296248ed2a553f1ac;hp=454b07405d694dad52e7f41af5816eed0190da8a
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index da1ae0e..f8cc758 100644 (file)
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -1926,6 +1926,7 @@ retry:
goto out_unlock;
}
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
skb->protocol = proto;
skb->dev = dev;
skb->priority = sk->sk_priority;
@@ -2352,6 +2353,7 @@ static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
ph.raw = frame;
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
skb->protocol = proto;
skb->dev = dev;
skb->priority = po->sk.sk_priority;
@@ -2776,6 +2778,7 @@ static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len)
goto out_free;
}
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
skb->protocol = proto;
skb->dev = dev;
skb->priority = sk->sk_priority;
Thanks,
Ben
--
Ben Greear <greearb@xxxxxxxxxxxxxxx>
Candela Technologies Inc http://www.candelatech.com
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