On Wed, 2015-09-16 at 03:53 -0700, Eric Dumazet wrote: > You should use netdev_alloc_skb() : This helper is better for rx skbs, > as it allows for better packing of frames in GRO or TCP stack.
OK, thanks. I don't have a netdev (this is an ATM device) but I can use dev_alloc_skb(). > Also netdev_alloc_skb_ip_align() might handle the NET_IP_ALIGN stuff > for arches that care. I'd briefly considered NET_IP_ALIGN but decided against it because this isn't Ethernet and my hardware header is a nice sane 8 bytes, not 14. But actually, the primary use cases for this are PPPoATM — with 2 bytes of PPP frame type, and PPPoE over BR2684 — with 14 bytes of Ethernet header. So NET_IP_ALIGN would actually make sense. Unfortunately the FPGA can't do DMA to unaligned addresses, so I can't do it in the DMA case. I can do it for the MMIO code path though (which I still haven't tested). I'll send a new patch in a moment... -- dwmw2
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