linux-kernel - [PATCH v2 net-next 02/13] net: stmmac: xgmac: Add RBU handling in DMA interrupt

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Message-Id: <42759cafe734764d692597437835b42eec66e059.1567602867.git.joabreu@synopsys.com>
Date:   Wed,  4 Sep 2019 15:16:54 +0200
From:   Jose Abreu <Jose.Abreu@...opsys.com>
To:     netdev@...r.kernel.org
Cc:     Joao Pinto <Joao.Pinto@...opsys.com>,
        Jose Abreu <Jose.Abreu@...opsys.com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        "David S. Miller" <davem@...emloft.net>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 net-next 02/13] net: stmmac: xgmac: Add RBU handling in DMA interrupt

Add the handling of Receive Buffer Unavailable interrupt in the DMA
handler of XGMAC cores.

Signed-off-by: Jose Abreu <joabreu@...opsys.com>

---
Cc: Giuseppe Cavallaro <peppe.cavallaro@...com>
Cc: Alexandre Torgue <alexandre.torgue@...com>
Cc: Jose Abreu <joabreu@...opsys.com>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Maxime Coquelin <mcoquelin.stm32@...il.com>
Cc: netdev@...r.kernel.org
Cc: linux-stm32@...md-mailman.stormreply.com
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
---
 drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c
index 64956465c030..e77eb0ddf9b5 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c
@@ -322,6 +322,10 @@ static int dwxgmac2_dma_interrupt(void __iomem *ioaddr,
 
 	/* ABNORMAL interrupts */
 	if (unlikely(intr_status & XGMAC_AIS)) {
+		if (unlikely(intr_status & XGMAC_RBU)) {
+			x->rx_buf_unav_irq++;
+			ret |= handle_rx;
+		}
 		if (unlikely(intr_status & XGMAC_TPS)) {
 			x->tx_process_stopped_irq++;
 			ret |= tx_hard_error;
-- 
2.7.4