linux-kernel - [PATCH net 5/9] net: stmmac: xgmac: Only get SPH header len if available

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Message-Id: <ef314ca26e4a621fa8464d76aed07882dd4b0ee5.1572355609.git.Jose.Abreu@synopsys.com>
Date:   Tue, 29 Oct 2019 15:14:49 +0100
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>,
        Jose Abreu <Jose.Abreu@...opsys.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 net 5/9] net: stmmac: xgmac: Only get SPH header len if available

Split Header length is only available when L34T == 0. Fix this by
correctly checking if L34T is zero before trying to get Header length.

Fixes: 67afd6d1cfdf ("net: stmmac: Add Split Header support and enable it in XGMAC cores")
Signed-off-by: Jose Abreu <Jose.Abreu@...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_descs.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_descs.c b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_descs.c
index ae48154f933c..bd5838ce1e8a 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_descs.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_descs.c
@@ -288,7 +288,8 @@ static int dwxgmac2_get_rx_hash(struct dma_desc *p, u32 *hash,
 
 static int dwxgmac2_get_rx_header_len(struct dma_desc *p, unsigned int *len)
 {
-	*len = le32_to_cpu(p->des2) & XGMAC_RDES2_HL;
+	if (le32_to_cpu(p->des3) & XGMAC_RDES3_L34T)
+		*len = le32_to_cpu(p->des2) & XGMAC_RDES2_HL;
 	return 0;
 }
 
-- 
2.7.4