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net: xilinx: axienet: Schedule NAPI in two steps

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[ Upstream commit ba0da2dc93 ]

As advised by Documentation/networking/napi.rst, masking IRQs after
calling napi_schedule can be racy. Avoid this by only masking/scheduling
if napi_schedule_prep returns true.

Fixes: 9e2bc267e7 ("net: axienet: Use NAPI for TX completion path")
Fixes: cc37610caa ("net: axienet: implement NAPI and GRO receive")
Signed-off-by: Sean Anderson <sean.anderson@linux.dev>
Reviewed-by: Shannon Nelson <shannon.nelson@amd.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20240913145711.2284295-1-sean.anderson@linux.dev
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Sean Anderson 2024-09-13 10:57:11 -04:00 committed by Greg Kroah-Hartman
parent 9360d077d3
commit bcce13930b
1 changed files with 8 additions and 6 deletions
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14
drivers/net/ethernet/xilinx/xilinx_axienet_main.c
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@ -1042,9 +1042,10 @@ static irqreturn_t axienet_tx_irq(int irq, void *_ndev)
u32 cr = lp->tx_dma_cr;
cr &= ~(XAXIDMA_IRQ_IOC_MASK | XAXIDMA_IRQ_DELAY_MASK);
axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET, cr);
napi_schedule(&lp->napi_tx);
if (napi_schedule_prep(&lp->napi_tx)) {
axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET, cr);
__napi_schedule(&lp->napi_tx);
}
}
return IRQ_HANDLED;
@ -1086,9 +1087,10 @@ static irqreturn_t axienet_rx_irq(int irq, void *_ndev)
u32 cr = lp->rx_dma_cr;
cr &= ~(XAXIDMA_IRQ_IOC_MASK | XAXIDMA_IRQ_DELAY_MASK);
axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET, cr);
napi_schedule(&lp->napi_rx);
if (napi_schedule_prep(&lp->napi_rx)) {
axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET, cr);
__napi_schedule(&lp->napi_rx);
}
}
return IRQ_HANDLED;