On 2015/10/26 16:47, Grumbach, Emmanuel wrote:
> On 10/26/2015 06:03 AM, Toshiaki Makita wrote:
>> On 2015/10/26 5:02, Emmanuel Grumbach wrote:
>>> Adding IPv6 for the TSO helper API is trivial:
>>> * Don't play with the id (which doesn't exist in IPv6)
>>> * Correctly update the payload_len (don't include the
>>> length of the IP header itself)
>> ...
>>> memcpy(hdr, skb->data, hdr_len);
>>> - iph = (struct iphdr *)(hdr + mac_hdr_len);
>>> - iph->id = htons(tso->ip_id);
>>> - iph->tot_len = htons(size + hdr_len - mac_hdr_len);
>>> + if (skb->protocol == htons(ETH_P_IP)) {
>>
>> I guess this should be vlan_get_protocol(skb).
>
> I truly don't know. I guess we could have VLANs, but I'd need to check
> how the packet would look like after it exits mac80211.
I don't know much about mac80211.
What I see is that mvneta has TSO in vlan_features and it uses
tso_build_hdr(). When vlan device is used, we cannot access network
protocol by skb->protocol without HW vlan acceleration.
So it looks like this change corrupts TSO functionality on mvneta.
> If we need that, I'll likely do this check once in tso_start() and add a
> variable to struct tso_t.
I'm not sure if an additional variable is needed.
At least, skb_network_offset()/ip_hdr() should correctly handle (skip)
vlan headers.
Toshiaki Makita
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