igc: Add igc_xdp_buff wrapper for xdp_buff in driver

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Driver specific metadata data for XDP-hints kfuncs are propagated via tail
extending the struct xdp_buff with a locally scoped driver struct.

Zero-Copy AF_XDP/XSK does similar tricks via struct xdp_buff_xsk. This
xdp_buff_xsk struct contains a CB area (24 bytes) that can be used for
extending the locally scoped driver into. The XSK_CHECK_PRIV_TYPE define
catch size violations build time.

The changes needed for AF_XDP zero-copy in igc_clean_rx_irq_zc()
is done in next patch, because the member rx_desc isn't available
at this point.

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Song Yoong Siang <yoong.siang.song@intel.com>
Link: https://lore.kernel.org/bpf/168182464779.616355.3761989884165609387.stgit@firesoul

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This commit is contained in:

Jesper Dangaard Brouer 2023-04-18 15:30:47 +02:00 • committed by Daniel Borkmann

parent 84214ab468

commit 73b7123de0

2 changed files with 14 additions and 7 deletions

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5

drivers/net/ethernet/intel/igc/igc.h

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16

drivers/net/ethernet/intel/igc/igc_main.c

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