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Date: Tue, 22 Nov 2016 17:48:41 +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: 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,
Marcin Wojtas <mw@...ihalf.com>
Subject: [PATCH net-next 1/4] 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>
---
drivers/net/ethernet/marvell/mvneta.c | 77 ++++++++++++++++++++++++++++++++---
1 file changed, 71 insertions(+), 6 deletions(-)
diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c
index 87274d4ab102..67f6465d96ba 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, \
@@ -416,8 +422,11 @@ struct mvneta_port {
u64 ethtool_stats[ARRAY_SIZE(mvneta_statistics)];
u32 indir[MVNETA_RSS_LU_TABLE_SIZE];
+#ifdef CONFIG_64BIT
+ u64 data_high;
+#endif
+ u16 rx_offset_correction;
};
-
/* The mvneta_tx_desc and mvneta_rx_desc structures describe the
* layout of the transmit and reception DMA descriptors, and their
* layout is therefore defined by the hardware design
@@ -1791,6 +1800,10 @@ static int mvneta_rx_refill(struct mvneta_port *pp,
if (!data)
return -ENOMEM;
+#ifdef CONFIG_64BIT
+ if (unlikely(pp->data_high != (u64)upper_32_bits((u64)data) << 32))
+ return -ENOMEM;
+#endif
phys_addr = dma_map_single(pp->dev->dev.parent, data,
MVNETA_RX_BUF_SIZE(pp->pkt_size),
DMA_FROM_DEVICE);
@@ -1799,7 +1812,8 @@ static int mvneta_rx_refill(struct mvneta_port *pp,
return -ENOMEM;
}
- mvneta_rx_desc_fill(rx_desc, phys_addr, (u32)data);
+ phys_addr += pp->rx_offset_correction;
+ mvneta_rx_desc_fill(rx_desc, phys_addr, (uintptr_t)data);
return 0;
}
@@ -1861,8 +1875,16 @@ static void mvneta_rxq_drop_pkts(struct mvneta_port *pp,
for (i = 0; i < rxq->size; i++) {
struct mvneta_rx_desc *rx_desc = rxq->descs + i;
- void *data = (void *)rx_desc->buf_cookie;
-
+ void *data = (u8 *)(uintptr_t)rx_desc->buf_cookie;
+#ifdef CONFIG_64BIT
+ /* In Neta HW only 32 bits data is supported, so in
+ * order to obtain whole 64 bits address from RX
+ * descriptor, we store the upper 32 bits when
+ * allocating buffer, and put it back when using
+ * buffer cookie for accessing packet in memory.
+ */
+ data = (u8 *)(pp->data_high | (u64)data);
+#endif
dma_unmap_single(pp->dev->dev.parent, rx_desc->buf_phys_addr,
MVNETA_RX_BUF_SIZE(pp->pkt_size), DMA_FROM_DEVICE);
mvneta_frag_free(pp->frag_size, data);
@@ -1899,7 +1921,17 @@ static int mvneta_rx_swbm(struct mvneta_port *pp, int rx_todo,
rx_done++;
rx_status = rx_desc->status;
rx_bytes = rx_desc->data_size - (ETH_FCS_LEN + MVNETA_MH_SIZE);
+#ifdef CONFIG_64BIT
+ /* In Neta HW only 32 bits data is supported, so in
+ * order to obtain whole 64 bits address from RX
+ * descriptor, we store the upper 32 bits when
+ * allocating buffer, and put it back when using
+ * buffer cookie for accessing packet in memory.
+ */
+ data = (u8 *)(pp->data_high | (u64)rx_desc->buf_cookie);
+#else
data = (unsigned char *)rx_desc->buf_cookie;
+#endif
phys_addr = rx_desc->buf_phys_addr;
if (!mvneta_rxq_desc_is_first_last(rx_status) ||
@@ -2020,7 +2052,17 @@ static int mvneta_rx_hwbm(struct mvneta_port *pp, int rx_todo,
rx_done++;
rx_status = rx_desc->status;
rx_bytes = rx_desc->data_size - (ETH_FCS_LEN + MVNETA_MH_SIZE);
- data = (unsigned char *)rx_desc->buf_cookie;
+#ifdef CONFIG_64BIT
+ /* In Neta HW only 32 bits data is supported, so in
+ * order to obtain whole 64 bits address from RX
+ * descriptor, we store the upper 32 bits when
+ * allocating buffer, and put it back when using
+ * buffer cookie for accessing packet in memory.
+ */
+ data = (u8 *)(pp->data_high | (u64)rx_desc->buf_cookie);
+#else
+ data = (u8 *)rx_desc->buf_cookie;
+#endif
phys_addr = rx_desc->buf_phys_addr;
pool_id = MVNETA_RX_GET_BM_POOL_ID(rx_desc);
bm_pool = &pp->bm_priv->bm_pools[pool_id];
@@ -2773,7 +2815,7 @@ 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);
@@ -2930,6 +2972,22 @@ static void mvneta_cleanup_rxqs(struct mvneta_port *pp)
static int mvneta_setup_rxqs(struct mvneta_port *pp)
{
int queue;
+#ifdef CONFIG_64BIT
+ void *data_tmp;
+
+ /* In Neta HW only 32 bits data is supported, so in order to
+ * obtain whole 64 bits address from RX descriptor, we store
+ * the upper 32 bits when allocating buffer, and put it back
+ * when using buffer cookie for accessing packet in memory.
+ * Frags should be allocated from single 'memory' region,
+ * hence common upper address half should be sufficient.
+ */
+ data_tmp = mvneta_frag_alloc(pp->frag_size);
+ if (data_tmp) {
+ pp->data_high = (u64)upper_32_bits((u64)data_tmp) << 32;
+ mvneta_frag_free(pp->frag_size, data_tmp);
+ }
+#endif
for (queue = 0; queue < rxq_number; queue++) {
int err = mvneta_rxq_init(pp, &pp->rxqs[queue]);
@@ -4019,6 +4077,13 @@ 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");
--
2.10.2
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