6.6-stable review patch. If anyone has any objections, please let me know.
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From: Baruch Siach baruch@tkos.co.il
[ Upstream commit b6cb4541853c7ee512111b0e7ddf3cb66c99c137 ]
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: 47dd7a540b8a ("net: add support for STMicroelectronics Ethernet controllers.") Link: https://lore.kernel.org/r/d95413e44c97d4692e72cec13a75f894abeb6998.169989737... Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c index 53358015fbe5c..1fa4da96c8f50 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c @@ -5267,6 +5267,7 @@ static int stmmac_rx(struct stmmac_priv *priv, int limit, u32 queue)
dma_dir = page_pool_get_dma_dir(rx_q->page_pool); buf_sz = DIV_ROUND_UP(priv->dma_conf.dma_buf_sz, PAGE_SIZE) * PAGE_SIZE; + limit = min(priv->dma_conf.dma_rx_size - 1, (unsigned int)limit);
if (netif_msg_rx_status(priv)) { void *rx_head;