net: enetc: add support for XDP_REDIRECT

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The driver implementation of the XDP_REDIRECT action reuses parts from
XDP_TX, most notably the enetc_xdp_tx function which transmits an array
of TX software BDs. Only this time, the buffers don't have DMA mappings,
we need to create them.

When a BPF program reaches the XDP_REDIRECT verdict for a frame, we can
employ the same buffer reuse strategy as for the normal processing path
and for XDP_PASS: we can flip to the other page half and seed that to
the RX ring.

Note that scatter/gather support is there, but disabled due to lack of
multi-buffer support in XDP (which is added by this series):
https://patchwork.kernel.org/project/netdevbpf/cover/cover.1616179034.git.lorenzo@kernel.org/

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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This commit is contained in:

Vladimir Oltean 2021-03-31 23:08:57 +03:00 • committed by David S. Miller

parent d6a2829e82

commit 9d2b68cc10

4 changed files with 218 additions and 12 deletions

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212

drivers/net/ethernet/freescale/enetc/enetc.c

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11

drivers/net/ethernet/freescale/enetc/enetc.h

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6

drivers/net/ethernet/freescale/enetc/enetc_ethtool.c

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1

drivers/net/ethernet/freescale/enetc/enetc_pf.c

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