> Quoting Shirley Ma <[EMAIL PROTECTED]>:
> Subject: Re: IPoIB NETIF_F_SG flag for GSO
>
> Hello Michael,
>
> > Yes. SG currently needs csum offloading, and IPoIB does not
> > support that.
>
> SG should have nothing to do with CSUM. They are two different features, one
> is
> for scatter/gather IO, one is HW can checksum all the packets. If you look at
> net device feature, NETIF_F_SG & NETIF_F_HW_CSUM are different flags.
Look at register_netdevice:
/* Fix illegal SG+CSUM combinations. */
if ((dev->features & NETIF_F_SG) &&
!(dev->features & NETIF_F_ALL_CSUM)) {
printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no checksum
feature.\n",
dev->name);
dev->features &= ~NETIF_F_SG;
}
> What did you get when enabling IPoIB SG? I rememerbed there was a discussion
> in
> net-dev before.
>
> Thanks
> Shirley Ma
Google it.
--
MST
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