net/mlx5e: RX, Fix page_pool page fragment tracking for XDP

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[ Upstream commit 7abd955a58 ]

Currently mlx5e releases pages directly to the page_pool for XDP_TX and
does page fragment counting for XDP_REDIRECT. RX pages from the
page_pool are leaking on XDP_REDIRECT because the xdp core will release
only one fragment out of MLX5E_PAGECNT_BIAS_MAX and subsequently the page
is marked as "skip release" which avoids the driver release.

A fix would be to take an extra fragment for XDP_REDIRECT and not set the
"skip release" bit so that the release on the driver side can handle the
remaining bias fragments. But this would be a shortsighted solution.
Instead, this patch converges the two XDP paths (XDP_TX and XDP_REDIRECT) to
always do fragment tracking. The "skip release" bit is no longer
necessary for XDP.

Fixes: 6f57428460 ("net/mlx5e: RX, Enable skb page recycling through the page_pool")
Signed-off-by: Dragos Tatulea <dtatulea@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Dragos Tatulea 2023-05-31 21:18:49 +03:00 • committed by Greg Kroah-Hartman

parent 3c351aa1f4

commit cbb5379362

2 changed files with 13 additions and 22 deletions

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3

drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c

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32

drivers/net/ethernet/mellanox/mlx5/core/en_rx.c

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