nfp: xsk: add AF_XDP zero-copy Rx and Tx support

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This patch adds zero-copy Rx and Tx support for AF_XDP sockets. It do so
by adding a separate NAPI poll function that is attached to a each
channel when the XSK socket is attached with XDP_SETUP_XSK_POOL, and
restored when the XSK socket is terminated, this is done per channel.

Support for XDP_TX is implemented and the XDP buffer can safely be moved
from the Rx to the Tx queue and correctly freed and returned to the XSK
pool once it's transmitted.

Note that when AF_XDP zero-copy is enabled, the XDP action XDP_PASS
will allocate a new buffer and copy the zero-copy frame prior
passing it to the kernel stack.

This patch is based on previous work by Jakub Kicinski.

Signed-off-by: Niklas Söderlund <niklas.soderlund@corigine.com>
Signed-off-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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This commit is contained in:

Niklas Söderlund 2022-03-04 11:22:14 +01:00 • committed by David S. Miller

parent 9c91a3653f

commit 6402528b7a

6 changed files with 756 additions and 28 deletions

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1

drivers/net/ethernet/netronome/nfp/Makefile

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31

drivers/net/ethernet/netronome/nfp/nfp_net.h

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98

drivers/net/ethernet/netronome/nfp/nfp_net_common.c

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31

drivers/net/ethernet/netronome/nfp/nfp_net_debugfs.c

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592

drivers/net/ethernet/netronome/nfp/nfp_net_xsk.c

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29

drivers/net/ethernet/netronome/nfp/nfp_net_xsk.h

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