nfp: use TX ring pointer write back

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Newer versions of the PCIe microcode support writing back the
position of the TX pointer back into host memory.  This speeds
up TX completions, because we avoid a read from device memory
(replacing PCIe read with DMA coherent read).

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Fei Qin <fei.qin@corigine.com>
Signed-off-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

...

This commit is contained in:

Jakub Kicinski 2022-03-21 11:42:05 +01:00 • committed by David S. Miller

parent 07cd69c96b

commit 0dcf7f500b

6 changed files with 56 additions and 7 deletions

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5

drivers/net/ethernet/netronome/nfp/nfd3/dp.c

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7

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

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

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5

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

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29

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

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8

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

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