linux-kernel - [PATCH net-next v2 08/10] net: stmmac: Update RX Tail Pointer to last free entry

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Message-Id: <7d3d1779d41980394ad8d153e0137eae783f979c.1561706801.git.joabreu@synopsys.com>
Date:   Fri, 28 Jun 2019 09:29:19 +0200
From:   Jose Abreu <Jose.Abreu@...opsys.com>
To:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Cc:     Jose Abreu <Jose.Abreu@...opsys.com>,
        Joao Pinto <Joao.Pinto@...opsys.com>,
        "David S . Miller" <davem@...emloft.net>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>
Subject: [PATCH net-next v2 08/10] net: stmmac: Update RX Tail Pointer to last free entry

Update the RX Tail Pointer to the last available SKB entry.

Signed-off-by: Jose Abreu <joabreu@...opsys.com>
Cc: Joao Pinto <jpinto@...opsys.com>
Cc: David S. Miller <davem@...emloft.net>
Cc: Giuseppe Cavallaro <peppe.cavallaro@...com>
Cc: Alexandre Torgue <alexandre.torgue@...com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 620dd387e3b1..a629b3144a0d 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -3347,6 +3347,8 @@ static inline void stmmac_rx_refill(struct stmmac_priv *priv, u32 queue)
 		entry = STMMAC_GET_ENTRY(entry, DMA_RX_SIZE);
 	}
 	rx_q->dirty_rx = entry;
+	rx_q->rx_tail_addr = rx_q->dma_rx_phy +
+			    (rx_q->dirty_rx * sizeof(struct dma_desc));
 	stmmac_set_rx_tail_ptr(priv, priv->ioaddr, rx_q->rx_tail_addr, queue);
 }
 
-- 
2.7.4