> 169 if (hh) {
> 170 read_lock_bh(&hh->hh_lock);
> 171 memcpy(skb->data - 16, hh->hh_data, 16);
> 172 read_unlock_bh(&hh->hh_lock);
> 173 skb_push(skb, hh->hh_len);
> 174 return hh->hh_output(skb);
> 175 } else if (dst->neighbour)
> 176 return dst->neighbour->output(skb);
>
>We cache the L1 headers for some devices when ARP entries are
>resolved, when we have such a cached hardware-level header we just
>copy it directly in front of the IPV4 header and transmit the packet.
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is this cache device dependent? because there is ...else if.... so it might
not be any cache there on the NIC
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