RE: [Intel-wired-lan] [PATCH v4 net-next 9/9] ixgbe: respect metadata on XSK Rx to skb

[Penigalapati, Sandeep]

>-----Original Message-----
>From: Intel-wired-lan <intel-wired-lan-bounces@xxxxxxxxxx> On Behalf Of
>Alexander Lobakin
>Sent: Wednesday, December 8, 2021 7:37 PM
>To: intel-wired-lan@xxxxxxxxxxxxxxxx
>Cc: Song Liu <songliubraving@xxxxxx>; Alexei Starovoitov <ast@xxxxxxxxxx>;
>Andrii Nakryiko <andrii@xxxxxxxxxx>; Daniel Borkmann
><daniel@xxxxxxxxxxxxx>; John Fastabend <john.fastabend@xxxxxxxxx>;
>Jesper Dangaard Brouer <brouer@xxxxxxxxxx>; Yonghong Song
><yhs@xxxxxx>; Jesper Dangaard Brouer <hawk@xxxxxxxxxx>; KP Singh
><kpsingh@xxxxxxxxxx>; Jakub Kicinski <kuba@xxxxxxxxxx>;
>netdev@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; David S. Miller
><davem@xxxxxxxxxxxxx>; Björn Töpel <bjorn@xxxxxxxxxx>;
>bpf@xxxxxxxxxxxxxxx; Martin KaFai Lau <kafai@xxxxxx>
>Subject: [Intel-wired-lan] [PATCH v4 net-next 9/9] ixgbe: respect metadata on
>XSK Rx to skb
>
>For now, if the XDP prog returns XDP_PASS on XSK, the metadata will be lost
>as it doesn't get copied to the skb.
>Copy it along with the frame headers. Account its size on skb allocation, and
>when copying just treat it as a part of the frame and do a pull after to "move"
>it to the "reserved" zone.
>net_prefetch() xdp->data_meta and align the copy size to speed-up
>memcpy() a little and better match ixgbe_costruct_skb().
>
>Fixes: d0bcacd0a130 ("ixgbe: add AF_XDP zero-copy Rx support")
>Suggested-by: Jesper Dangaard Brouer <brouer@xxxxxxxxxx>
>Suggested-by: Maciej Fijalkowski <maciej.fijalkowski@xxxxxxxxx>
>Signed-off-by: Alexander Lobakin <alexandr.lobakin@xxxxxxxxx>
>Reviewed-by: Michal Swiatkowski <michal.swiatkowski@xxxxxxxxxxxxxxx>
>---
> drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c | 14 ++++++++++----
> 1 file changed, 10 insertions(+), 4 deletions(-)
>
Tested-by: Sandeep Penigalapati <sandeep.penigalapati@xxxxxxxxx>