[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 at osuosl.org> On Behalf Of
>Alexander Lobakin
>Sent: Wednesday, December 8, 2021 7:37 PM
>To: intel-wired-lan at lists.osuosl.org
>Cc: Song Liu <songliubraving at fb.com>; Alexei Starovoitov <ast at kernel.org>;
>Andrii Nakryiko <andrii at kernel.org>; Daniel Borkmann
><daniel at iogearbox.net>; John Fastabend <john.fastabend at gmail.com>;
>Jesper Dangaard Brouer <brouer at redhat.com>; Yonghong Song
><yhs at fb.com>; Jesper Dangaard Brouer <hawk at kernel.org>; KP Singh
><kpsingh at kernel.org>; Jakub Kicinski <kuba at kernel.org>;
>netdev at vger.kernel.org; linux-kernel at vger.kernel.org; David S. Miller
><davem at davemloft.net>; Björn Töpel <bjorn at kernel.org>;
>bpf at vger.kernel.org; Martin KaFai Lau <kafai at fb.com>
>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 at redhat.com>
>Suggested-by: Maciej Fijalkowski <maciej.fijalkowski at intel.com>
>Signed-off-by: Alexander Lobakin <alexandr.lobakin at intel.com>
>Reviewed-by: Michal Swiatkowski <michal.swiatkowski at linux.intel.com>
>---
> drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c | 14 ++++++++++----
> 1 file changed, 10 insertions(+), 4 deletions(-)
>
Tested-by: Sandeep Penigalapati <sandeep.penigalapati at intel.com>