Re: [PATCH net 3/5] fm10k: Implement ndo_gso_check()

On 11/6/14, 9:05 PM, "Joe Stringer" [off-list ref] wrote:

Let's merge both discussions into one thread (pick here or there). We
have 
this suggestion or the one which simply checks for tunnels and
inner+outer 
header lengths. Do you have a preference between them?

Agreed with merging the thread--consider it merged!

Reflecting on this some more, I prefer the latter option (checking tunnels
and header lengths). I'm leaning towards pushing the header length check
into fm10k_tx_encap_offload and then making fm10k_gso_check call that with
the gso_type. So, it's really the most recent version of the patch you
proposed:

static bool fm10k_gso_check(struct sk_buff *skb, struct net_device *dev)
{
	if ((skb_shinfo(skb)->gso_type & (SKB_GSO_UDP_TUNNEL | SKB_GSO_GRE)) &&
	    !fm10k_tx_encap_offload(skb))
		return false;

	return true;
}


plus the header length being checked in fm10k_tx_encap_offload. The only
nit would be that I'd just return the conditional instead of having
"return true" or "return false" lines.

The tunnel length check really should be there in fm10k_tx_encap_offload
anyway, so I'll get a patch together for that one.

We could introduce an "skb_is_gso_encap()" or similar for this purpose.
Checking for SKB_GSO_UDP_TUNNEL or SKB_GSO_GRE is pretty closely tied to
what 
fm10k_tx_encap_offload() checks for though; it might not even make sense
to call 
it if some of the other SKB_GSO_* flags are raised.

A fair point. On the other hand, we have to check the header length both
in the GSO and non-GSO cases anyway, so only having the check in
fm10k_tx_encap_offload and calling it from fm10k_gso_check wouldn't be as
duplicative. What do you think about that approach?

As an aside: the more I think about this, the more I think Tom's right and
that each driver really should have it's own ndo_gso_check() for this.
With fm10k and i40e being different, we're already at 40% of the current
drivers being different. I'll leave it to Or to comment on whether the
other drivers could share the check in some manner.

Cheers,
Matthew