qede: Add support for XDP_TX

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Add support for forwarding via XDP. Once the eBPF is attached,
driver would allocate & configure a designated transmission queue
meant solely for forwarding packets. Said queue would share the
receive-queue's interrupt line, and would have it's own Tx statistics.

Infrastructure changes required for this [spread-out through the code]:
 - Determine the DMA direction of the receive buffers based on the presence
of the eBPF program.
 - Turn the sw Tx ring into a union, as regular/XDP queues have different
needs for releasing resources after completion [regular requires the SKB,
XDP requires the transmitted page].

Signed-off-by: Yuval Mintz <Yuval.Mintz@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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This commit is contained in:

Mintz, Yuval 2016-11-29 16:47:10 +02:00 • committed by David S. Miller

parent 496e051709

commit cb6aeb0792

3 changed files with 216 additions and 35 deletions

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16

drivers/net/ethernet/qlogic/qede/qede.h

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22

drivers/net/ethernet/qlogic/qede/qede_ethtool.c

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213

drivers/net/ethernet/qlogic/qede/qede_main.c

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