net: ena: introduce XDP redirect implementation

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This patch adds a partial support for the XDP_REDIRECT directive which
instructs the driver to pass the packet to an interface specified by the
program. The directive is passed to the driver by calling bpf_redirect()
or bpf_redirect_map() functions from the eBPF program.

To lay the ground for integration with the existing XDP TX
implementation the patch removes the redundant page ref count increase
in ena_xdp_xmit_frame() and then decrease in ena_clean_rx_irq(). Instead
it only DMA unmaps descriptors for which XDP TX or REDIRECT directive
was received.

The XDP Redirect support is still missing .ndo_xdp_xmit function
implementation, which allows to redirect packet to an ENA interface,
which would be added in a later patch.

Signed-off-by: Shay Agroskin <shayagr@amazon.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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This commit is contained in:

Shay Agroskin 2020-12-08 20:02:06 +02:00 • committed by Jakub Kicinski

parent e8223eeff0

commit a318c70ad1

3 changed files with 53 additions and 32 deletions

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drivers/net/ethernet/amazon/ena/ena_ethtool.c

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drivers/net/ethernet/amazon/ena/ena_netdev.c

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drivers/net/ethernet/amazon/ena/ena_netdev.h

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