[ovs-dev] [PATCH net 1/5] openvswitch: Pad OVS_PACKET_ATTR_PACKET if linear copy was performed

Jesse Gross jesse at nicira.com
Wed Feb 5 06:02:12 UTC 2014


On Mon, Feb 3, 2014 at 8:43 AM, Sergei Shtylyov
<sergei.shtylyov at cogentembedded.com> wrote:
> Hello.
>
>
> On 03-02-2014 5:08, Jesse Gross wrote:
>
>> From: Thomas Graf <tgraf at suug.ch>
>
>
>> While the zerocopy method is correctly omitted if user space
>> does not support unaligned Netlink messages. The attribute is
>> still not padded correctly as skb_zerocopy() will not ensure
>> padding and the attribute size is no longer pre calculated
>> though nla_reserve() which ensured padding previously.
>
>
>> This patch applies appropriate padding if a linear data copy
>> was performed in skb_zerocopy().
>
>
>> Signed-off-by: Thomas Graf <tgraf at suug.ch>
>> Acked-by: Zoltan Kiss <zoltan.kiss at citrix.com>
>> Signed-off-by: Jesse Gross <jesse at nicira.com>
>> ---
>>   net/openvswitch/datapath.c | 7 ++++++-
>>   1 file changed, 6 insertions(+), 1 deletion(-)
>
>
>> diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c
>> index df46928..3ca9121 100644
>> --- a/net/openvswitch/datapath.c
>> +++ b/net/openvswitch/datapath.c
>
> [...]
>
>> @@ -466,6 +466,11 @@ static int queue_userspace_packet(struct datapath
>> *dp, struct sk_buff *skb,
>>
>>         skb_zerocopy(user_skb, skb, skb->len, hlen);
>>
>> +       /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
>> +       if (!(dp->user_features & OVS_DP_F_UNALIGNED) &&
>> +           (plen = (ALIGN(user_skb->len, NLA_ALIGNTO) - user_skb->len)) >
>> 0)
>
>
>    This shouldn't pass checkpatch.pl which complains about assignments
> inside *if* statements.

I've fixed both of these issues and will resubmit.



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