net: stmmac: avoid rx queue overrun

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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>

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Baruch Siach 2023-11-13 19:42:50 +02:00 • committed by Jakub Kicinski

parent fa02de9e75

commit b6cb454185

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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