netdev - Re: [PATCH v2 net] be2net: Allow GRE to work concurrently while a VxLAN tunnel is configured

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Message-ID: <CA+mtBx-tLRi21Sveh-TOmMC0T2cRNqcaEOx2thnqhU-ZLyaN2A@mail.gmail.com>
Date:	Wed, 14 Jan 2015 21:33:57 -0800
From:	Tom Herbert <therbert@...gle.com>
To:	Sriharsha Basavapatna <Sriharsha.Basavapatna@...lex.com>
Cc:	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: [PATCH v2 net] be2net: Allow GRE to work concurrently while a
 VxLAN tunnel is configured

> I don't understand why this is needed. The only GSO type with with encapsulation allowed by device features SKB_GSO_UDP_TUNNEL. This should not be GRE for instance. Do you see cases where protocol is not UDP at this point?
> [Harsha] It's needed for GRE checksum case; without this,  GRE pkts are sent down without checksum by the stack, but HW
> can only offload checksum for VxLAN pkts.
>
Okay, I see that this is a problem with checksum not GSO. Please ask
your hardware guys to provide NETIF_F_HW_CSUM to avoid any more of
this unpleasantness in the future :-)

>> +           skb->inner_protocol_type != ENCAP_TYPE_ETHER ||
>> +           skb->inner_protocol != htons(ETH_P_TEB) ||
>> +           skb_inner_mac_header(skb) - skb_transport_header(skb) !=
>> +           sizeof(struct udphdr) + sizeof(struct vxlanhdr))
>> +               return features & ~(NETIF_F_ALL_CSUM |
>> + NETIF_F_GSO_MASK);
>> +
>> +       return features;
>>  }
>>  #endif
>>
>> --
>> 1.7.9.5
>>
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