linux-kernel - [PATCH v6 net-next 4/7] net: mvneta: Convert to be 64 bits compatible

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Message-Id: <602540618cb1b9a586c8397233d4e97acaccdda1.1480611779.git-series.gregory.clement@free-electrons.com>
Date:   Thu,  1 Dec 2016 18:03:07 +0100
From:   Gregory CLEMENT <gregory.clement@...e-electrons.com>
To:     "David S. Miller" <davem@...emloft.net>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Cc:     Jisheng Zhang <jszhang@...vell.com>, Arnd Bergmann <arnd@...db.de>,
        Jason Cooper <jason@...edaemon.net>,
        Andrew Lunn <andrew@...n.ch>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Gregory CLEMENT <gregory.clement@...e-electrons.com>,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
        linux-arm-kernel@...ts.infradead.org,
        Nadav Haklai <nadavh@...vell.com>,
        Marcin Wojtas <mw@...ihalf.com>,
        Dmitri Epshtein <dima@...vell.com>,
        Yelena Krivosheev <yelena@...vell.com>
Subject: [PATCH v6 net-next 4/7] net: mvneta: Convert to be 64 bits compatible

From: Marcin Wojtas <mw@...ihalf.com>

Prepare the mvneta driver in order to be usable on the 64 bits platform
such as the Armada 3700.

[gregory.clement@...e-electrons.com]: this patch was extract from a larger
one to ease review and maintenance.

Signed-off-by: Marcin Wojtas <mw@...ihalf.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@...e-electrons.com>
Tested-by: Marcin Wojtas <mw@...ihalf.com>
---
 drivers/net/ethernet/marvell/mvneta.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c
index 92b9af14c352..8ef03fb69bcd 100644
--- a/drivers/net/ethernet/marvell/mvneta.c
+++ b/drivers/net/ethernet/marvell/mvneta.c
@@ -296,6 +296,12 @@
 /* descriptor aligned size */
 #define MVNETA_DESC_ALIGNED_SIZE	32
 
+/* Number of bytes to be taken into account by HW when putting incoming data
+ * to the buffers. It is needed in case NET_SKB_PAD exceeds maximum packet
+ * offset supported in MVNETA_RXQ_CONFIG_REG(q) registers.
+ */
+#define MVNETA_RX_PKT_OFFSET_CORRECTION		64
+
 #define MVNETA_RX_PKT_SIZE(mtu) \
 	ALIGN((mtu) + MVNETA_MH_SIZE + MVNETA_VLAN_TAG_LEN + \
 	      ETH_HLEN + ETH_FCS_LEN,			     \
@@ -416,6 +422,7 @@ struct mvneta_port {
 	u64 ethtool_stats[ARRAY_SIZE(mvneta_statistics)];
 
 	u32 indir[MVNETA_RSS_LU_TABLE_SIZE];
+	u16 rx_offset_correction;
 };
 
 /* The mvneta_tx_desc and mvneta_rx_desc structures describe the
@@ -1807,6 +1814,7 @@ static int mvneta_rx_refill(struct mvneta_port *pp,
 		return -ENOMEM;
 	}
 
+	phys_addr += pp->rx_offset_correction;
 	mvneta_rx_desc_fill(rx_desc, phys_addr, data, rxq);
 	return 0;
 }
@@ -2782,7 +2790,7 @@ static int mvneta_rxq_init(struct mvneta_port *pp,
 	mvreg_write(pp, MVNETA_RXQ_SIZE_REG(rxq->id), rxq->size);
 
 	/* Set Offset */
-	mvneta_rxq_offset_set(pp, rxq, NET_SKB_PAD);
+	mvneta_rxq_offset_set(pp, rxq, NET_SKB_PAD - pp->rx_offset_correction);
 
 	/* Set coalescing pkts and time */
 	mvneta_rx_pkts_coal_set(pp, rxq, rxq->pkts_coal);
@@ -4033,6 +4041,13 @@ static int mvneta_probe(struct platform_device *pdev)
 
 	pp->rxq_def = rxq_def;
 
+	/* Set RX packet offset correction for platforms, whose
+	 * NET_SKB_PAD, exceeds 64B. It should be 64B for 64-bit
+	 * platforms and 0B for 32-bit ones.
+	 */
+	pp->rx_offset_correction =
+		max(0, NET_SKB_PAD - MVNETA_RX_PKT_OFFSET_CORRECTION);
+
 	pp->indir[0] = rxq_def;
 
 	pp->clk = devm_clk_get(&pdev->dev, "core");
-- 
git-series 0.8.10