net: stmmac: avoid rx queue overrun

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[ Upstream commit b6cb454185 ]

dma_rx_size can be set as low as 64. Rx budget might be higher than
that. Make sure to not overrun allocated rx buffers when budget is
larger.

Leave one descriptor unused to avoid wrap around of 'dirty_rx' vs
'cur_rx'.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Reviewed-by: Serge Semin <fancer.lancer@gmail.com>
Fixes: 47dd7a540b ("net: add support for STMicroelectronics Ethernet controllers.")
Link: https://lore.kernel.org/r/d95413e44c97d4692e72cec13a75f894abeb6998.1699897370.git.baruch@tkos.co.il
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Baruch Siach 2023-11-13 19:42:50 +02:00 • committed by Greg Kroah-Hartman

parent 49fb680403

commit 7414a28de1

1 changed files with 1 additions and 0 deletions

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drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

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