[PATCH net-next 0/7] net: Korina improvements

[PATCH net-next 0/7] net: Korina improvements

[Thomas Bogendoerfer]

While converting Mikrotik RB532 support to use device tree I stumbled
over the korina ethernet driver, which used way too many MIPS specific
hacks. This series cleans this all up.

Thomas Bogendoerfer (7):
  net: korina: Fix MDIO functions
  net: korina: Use devres functions
  net: korina: Remove not needed cache flushes
  net: korina: Remove nested helpers
  net: korina: Use DMA API
  net: korina: Only pass mac address via platform data
  net: korina: Make driver COMPILE_TESTable

 arch/mips/rb532/devices.c     |   5 +-
 drivers/net/ethernet/Kconfig  |   2 +-
 drivers/net/ethernet/korina.c | 542 ++++++++++++++++++++++++----------
 3 files changed, 386 insertions(+), 163 deletions(-)

-- 
2.29.2

[PATCH net-next 1/7] net: korina: Fix MDIO functions

[Thomas Bogendoerfer]

Fixed MDIO functions to work reliable and not just by accident.

Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
---
 drivers/net/ethernet/korina.c | 57 +++++++++++++++++++++++------------
 1 file changed, 38 insertions(+), 19 deletions(-)

diff --git a/drivers/net/ethernet/korina.c b/drivers/net/ethernet/korina.c
index 925161959b9b..2266b18c1377 100644
--- a/drivers/net/ethernet/korina.c
+++ b/drivers/net/ethernet/korina.c
@@ -137,7 +137,6 @@ struct korina_private {
 	struct mii_if_info mii_if;
 	struct work_struct restart_task;
 	struct net_device *dev;
-	int phy_addr;
 };
 
 extern unsigned int idt_cpu_freq;
@@ -292,32 +291,50 @@ static int korina_send_packet(struct sk_buff *skb, struct net_device *dev)
 	return NETDEV_TX_OK;
 }
 
-static int mdio_read(struct net_device *dev, int mii_id, int reg)
+static int korina_mdio_wait(struct korina_private *lp)
+{
+	int timeout = 1000;
+
+	while ((readl(&lp->eth_regs->miimind) & 1) && timeout-- > 0)
+		udelay(1);
+
+	if (timeout <= 0)
+		return -1;
+
+	return 0;
+}
+
+static int korina_mdio_read(struct net_device *dev, int phy, int reg)
 {
 	struct korina_private *lp = netdev_priv(dev);
 	int ret;
 
-	mii_id = ((lp->rx_irq == 0x2c ? 1 : 0) << 8);
+	if (korina_mdio_wait(lp))
+		return -1;
 
-	writel(0, &lp->eth_regs->miimcfg);
-	writel(0, &lp->eth_regs->miimcmd);
-	writel(mii_id | reg, &lp->eth_regs->miimaddr);
-	writel(ETH_MII_CMD_SCN, &lp->eth_regs->miimcmd);
+	writel(phy << 8 | reg, &lp->eth_regs->miimaddr);
+	writel(1, &lp->eth_regs->miimcmd);
 
-	ret = (int)(readl(&lp->eth_regs->miimrdd));
+	if (korina_mdio_wait(lp))
+		return -1;
+
+	if (readl(&lp->eth_regs->miimind) & 4)
+		return -1;
+
+	ret = readl(&lp->eth_regs->miimrdd);
+	writel(0, &lp->eth_regs->miimcmd);
 	return ret;
 }
 
-static void mdio_write(struct net_device *dev, int mii_id, int reg, int val)
+static void korina_mdio_write(struct net_device *dev, int phy, int reg, int val)
 {
 	struct korina_private *lp = netdev_priv(dev);
 
-	mii_id = ((lp->rx_irq == 0x2c ? 1 : 0) << 8);
+	if (korina_mdio_wait(lp))
+		return;
 
-	writel(0, &lp->eth_regs->miimcfg);
-	writel(1, &lp->eth_regs->miimcmd);
-	writel(mii_id | reg, &lp->eth_regs->miimaddr);
-	writel(ETH_MII_CMD_SCN, &lp->eth_regs->miimcmd);
+	writel(0, &lp->eth_regs->miimcmd);
+	writel(phy << 8 | reg, &lp->eth_regs->miimaddr);
 	writel(val, &lp->eth_regs->miimwtd);
 }
 
@@ -643,7 +660,7 @@ static void korina_check_media(struct net_device *dev, unsigned int init_media)
 {
 	struct korina_private *lp = netdev_priv(dev);
 
-	mii_check_media(&lp->mii_if, 0, init_media);
+	mii_check_media(&lp->mii_if, 1, init_media);
 
 	if (lp->mii_if.full_duplex)
 		writel(readl(&lp->eth_regs->ethmac2) | ETH_MAC2_FD,
@@ -869,12 +886,15 @@ static int korina_init(struct net_device *dev)
 	 * Clock independent setting */
 	writel(((idt_cpu_freq) / MII_CLOCK + 1) & ~1,
 			&lp->eth_regs->ethmcp);
+	writel(0, &lp->eth_regs->miimcfg);
 
 	/* don't transmit until fifo contains 48b */
 	writel(48, &lp->eth_regs->ethfifott);
 
 	writel(ETH_MAC1_RE, &lp->eth_regs->ethmac1);
 
+	korina_check_media(dev, 1);
+
 	napi_enable(&lp->napi);
 	netif_start_queue(dev);
 
@@ -1089,11 +1109,10 @@ static int korina_probe(struct platform_device *pdev)
 	dev->watchdog_timeo = TX_TIMEOUT;
 	netif_napi_add(dev, &lp->napi, korina_poll, NAPI_POLL_WEIGHT);
 
-	lp->phy_addr = (((lp->rx_irq == 0x2c? 1:0) << 8) | 0x05);
 	lp->mii_if.dev = dev;
-	lp->mii_if.mdio_read = mdio_read;
-	lp->mii_if.mdio_write = mdio_write;
-	lp->mii_if.phy_id = lp->phy_addr;
+	lp->mii_if.mdio_read = korina_mdio_read;
+	lp->mii_if.mdio_write = korina_mdio_write;
+	lp->mii_if.phy_id = 1;
 	lp->mii_if.phy_id_mask = 0x1f;
 	lp->mii_if.reg_num_mask = 0x1f;
 
-- 
2.29.2

Re: [PATCH net-next 1/7] net: korina: Fix MDIO functions

[Andrew Lunn]

> +static int korina_mdio_wait(struct korina_private *lp)
> +{
> +	int timeout = 1000;
> +
> +	while ((readl(&lp->eth_regs->miimind) & 1) && timeout-- > 0)
> +		udelay(1);
> +
> +	if (timeout <= 0)
> +		return -1;
> +
> +	return 0;

Using readl_poll_timeout_atomic() would be better.


> +}
> +
> +static int korina_mdio_read(struct net_device *dev, int phy, int reg)
>  {
>  	struct korina_private *lp = netdev_priv(dev);
>  	int ret;
>  
> -	mii_id = ((lp->rx_irq == 0x2c ? 1 : 0) << 8);
> +	if (korina_mdio_wait(lp))
> +		return -1;

This should really be -ETIMEDOUT

>  	dev->watchdog_timeo = TX_TIMEOUT;
>  	netif_napi_add(dev, &lp->napi, korina_poll, NAPI_POLL_WEIGHT);
>  
> -	lp->phy_addr = (((lp->rx_irq == 0x2c? 1:0) << 8) | 0x05);
>  	lp->mii_if.dev = dev;
> -	lp->mii_if.mdio_read = mdio_read;
> -	lp->mii_if.mdio_write = mdio_write;
> -	lp->mii_if.phy_id = lp->phy_addr;
> +	lp->mii_if.mdio_read = korina_mdio_read;
> +	lp->mii_if.mdio_write = korina_mdio_write;
> +	lp->mii_if.phy_id = 1;
>  	lp->mii_if.phy_id_mask = 0x1f;
>  	lp->mii_if.reg_num_mask = 0x1f;

You could also replace all the mii code with phylib.

    Andrew

Re: [PATCH net-next 1/7] net: korina: Fix MDIO functions

[Thomas Bogendoerfer]

On Wed, Apr 14, 2021 at 09:36:04PM +0200, Andrew Lunn wrote:
> > +static int korina_mdio_wait(struct korina_private *lp)
> > +{
> > +	int timeout = 1000;
> > +
> > +	while ((readl(&lp->eth_regs->miimind) & 1) && timeout-- > 0)
> > +		udelay(1);
> > +
> > +	if (timeout <= 0)
> > +		return -1;
> > +
> > +	return 0;
> 
> Using readl_poll_timeout_atomic() would be better.

I'll have a look

> 
> 
> > +}
> > +
> > +static int korina_mdio_read(struct net_device *dev, int phy, int reg)
> >  {
> >  	struct korina_private *lp = netdev_priv(dev);
> >  	int ret;
> >  
> > -	mii_id = ((lp->rx_irq == 0x2c ? 1 : 0) << 8);
> > +	if (korina_mdio_wait(lp))
> > +		return -1;
> 
> This should really be -ETIMEDOUT

ok.

> >  	dev->watchdog_timeo = TX_TIMEOUT;
> >  	netif_napi_add(dev, &lp->napi, korina_poll, NAPI_POLL_WEIGHT);
> >  
> > -	lp->phy_addr = (((lp->rx_irq == 0x2c? 1:0) << 8) | 0x05);
> >  	lp->mii_if.dev = dev;
> > -	lp->mii_if.mdio_read = mdio_read;
> > -	lp->mii_if.mdio_write = mdio_write;
> > -	lp->mii_if.phy_id = lp->phy_addr;
> > +	lp->mii_if.mdio_read = korina_mdio_read;
> > +	lp->mii_if.mdio_write = korina_mdio_write;
> > +	lp->mii_if.phy_id = 1;
> >  	lp->mii_if.phy_id_mask = 0x1f;
> >  	lp->mii_if.reg_num_mask = 0x1f;
> 
> You could also replace all the mii code with phylib.

that's on my todo.

Thomas.

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea.                                                [ RFC1925, 2.3 ]

[PATCH net-next 2/7] net: korina: Use devres functions

[Thomas Bogendoerfer]

Simplify probe/remove code by using devm_ functions.

Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
---
 drivers/net/ethernet/korina.c | 64 ++++++++++++-----------------------
 1 file changed, 21 insertions(+), 43 deletions(-)

diff --git a/drivers/net/ethernet/korina.c b/drivers/net/ethernet/korina.c
index 2266b18c1377..3a454f6214b0 100644
--- a/drivers/net/ethernet/korina.c
+++ b/drivers/net/ethernet/korina.c
@@ -104,9 +104,9 @@ enum chain_status {
 
 /* Information that need to be kept for each board. */
 struct korina_private {
-	struct eth_regs *eth_regs;
-	struct dma_reg *rx_dma_regs;
-	struct dma_reg *tx_dma_regs;
+	struct eth_regs __iomem *eth_regs;
+	struct dma_reg __iomem *rx_dma_regs;
+	struct dma_reg __iomem *tx_dma_regs;
 	struct dma_desc *td_ring; /* transmit descriptor ring */
 	struct dma_desc *rd_ring; /* receive descriptor ring  */
 
@@ -1045,10 +1045,10 @@ static int korina_probe(struct platform_device *pdev)
 	struct korina_device *bif = platform_get_drvdata(pdev);
 	struct korina_private *lp;
 	struct net_device *dev;
-	struct resource *r;
+	void __iomem *p;
 	int rc;
 
-	dev = alloc_etherdev(sizeof(struct korina_private));
+	dev = devm_alloc_etherdev(&pdev->dev, sizeof(struct korina_private));
 	if (!dev)
 		return -ENOMEM;
 
@@ -1061,36 +1061,30 @@ static int korina_probe(struct platform_device *pdev)
 	lp->rx_irq = platform_get_irq_byname(pdev, "korina_rx");
 	lp->tx_irq = platform_get_irq_byname(pdev, "korina_tx");
 
-	r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "korina_regs");
-	dev->base_addr = r->start;
-	lp->eth_regs = ioremap(r->start, resource_size(r));
-	if (!lp->eth_regs) {
+	p = devm_platform_ioremap_resource_byname(pdev, "korina_regs");
+	if (!p) {
 		printk(KERN_ERR DRV_NAME ": cannot remap registers\n");
-		rc = -ENXIO;
-		goto probe_err_out;
+		return -ENOMEM;
 	}
+	lp->eth_regs = p;
 
-	r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "korina_dma_rx");
-	lp->rx_dma_regs = ioremap(r->start, resource_size(r));
-	if (!lp->rx_dma_regs) {
+	p = devm_platform_ioremap_resource_byname(pdev, "korina_dma_rx");
+	if (!p) {
 		printk(KERN_ERR DRV_NAME ": cannot remap Rx DMA registers\n");
-		rc = -ENXIO;
-		goto probe_err_dma_rx;
+		return -ENOMEM;
 	}
+	lp->rx_dma_regs = p;
 
-	r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "korina_dma_tx");
-	lp->tx_dma_regs = ioremap(r->start, resource_size(r));
-	if (!lp->tx_dma_regs) {
+	p = devm_platform_ioremap_resource_byname(pdev, "korina_dma_tx");
+	if (!p) {
 		printk(KERN_ERR DRV_NAME ": cannot remap Tx DMA registers\n");
-		rc = -ENXIO;
-		goto probe_err_dma_tx;
+		return -ENOMEM;
 	}
+	lp->tx_dma_regs = p;
 
 	lp->td_ring = kmalloc(TD_RING_SIZE + RD_RING_SIZE, GFP_KERNEL);
-	if (!lp->td_ring) {
-		rc = -ENXIO;
-		goto probe_err_td_ring;
-	}
+	if (!lp->td_ring)
+		return -ENOMEM;
 
 	dma_cache_inv((unsigned long)(lp->td_ring),
 			TD_RING_SIZE + RD_RING_SIZE);
@@ -1120,7 +1114,8 @@ static int korina_probe(struct platform_device *pdev)
 	if (rc < 0) {
 		printk(KERN_ERR DRV_NAME
 			": cannot register net device: %d\n", rc);
-		goto probe_err_register;
+		kfree((struct dma_desc *)KSEG0ADDR(lp->td_ring));
+		return rc;
 	}
 	timer_setup(&lp->media_check_timer, korina_poll_media, 0);
 
@@ -1128,20 +1123,7 @@ static int korina_probe(struct platform_device *pdev)
 
 	printk(KERN_INFO "%s: " DRV_NAME "-" DRV_VERSION " " DRV_RELDATE "\n",
 			dev->name);
-out:
 	return rc;
-
-probe_err_register:
-	kfree((struct dma_desc *)KSEG0ADDR(lp->td_ring));
-probe_err_td_ring:
-	iounmap(lp->tx_dma_regs);
-probe_err_dma_tx:
-	iounmap(lp->rx_dma_regs);
-probe_err_dma_rx:
-	iounmap(lp->eth_regs);
-probe_err_out:
-	free_netdev(dev);
-	goto out;
 }
 
 static int korina_remove(struct platform_device *pdev)
@@ -1149,13 +1131,9 @@ static int korina_remove(struct platform_device *pdev)
 	struct korina_device *bif = platform_get_drvdata(pdev);
 	struct korina_private *lp = netdev_priv(bif->dev);
 
-	iounmap(lp->eth_regs);
-	iounmap(lp->rx_dma_regs);
-	iounmap(lp->tx_dma_regs);
 	kfree((struct dma_desc *)KSEG0ADDR(lp->td_ring));
 
 	unregister_netdev(bif->dev);
-	free_netdev(bif->dev);
 
 	return 0;
 }
-- 
2.29.2

Re: [PATCH net-next 2/7] net: korina: Use devres functions

[Andrew Lunn]

> +	if (!p) {
>  		printk(KERN_ERR DRV_NAME ": cannot remap registers\n");
> -		rc = -ENXIO;
> -		goto probe_err_out;
> +		return -ENOMEM;
>  	}

Hi Thomas

Another possible cleanup would be replacing printk(KERN_ERR with
dev_err(), or netdev_err() etc.

	   Andrew

[PATCH net-next 3/7] net: korina: Remove not needed cache flushes

[Thomas Bogendoerfer]

Descriptors are mapped uncached so there is no need to do any cache
handling for them.

Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
---
 drivers/net/ethernet/korina.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/drivers/net/ethernet/korina.c b/drivers/net/ethernet/korina.c
index 3a454f6214b0..b6dcbb6d5e05 100644
--- a/drivers/net/ethernet/korina.c
+++ b/drivers/net/ethernet/korina.c
@@ -230,7 +230,6 @@ static int korina_send_packet(struct sk_buff *skb, struct net_device *dev)
 	dma_cache_wback((u32)skb->data, skb->len);
 
 	/* Setup the transmit descriptor. */
-	dma_cache_inv((u32) td, sizeof(*td));
 	td->ca = CPHYSADDR(skb->data);
 	chain_prev = (lp->tx_chain_tail - 1) & KORINA_TDS_MASK;
 	chain_next = (lp->tx_chain_tail + 1) & KORINA_TDS_MASK;
@@ -283,7 +282,6 @@ static int korina_send_packet(struct sk_buff *skb, struct net_device *dev)
 			lp->tx_chain_tail = chain_next;
 		}
 	}
-	dma_cache_wback((u32) td, sizeof(*td));
 
 	netif_trans_update(dev);
 	spin_unlock_irqrestore(&lp->lock, flags);
@@ -374,8 +372,6 @@ static int korina_rx(struct net_device *dev, int limit)
 	u32 devcs, pkt_len, dmas;
 	int count;
 
-	dma_cache_inv((u32)rd, sizeof(*rd));
-
 	for (count = 0; count < limit; count++) {
 		skb = lp->rx_skb[lp->rx_next_done];
 		skb_new = NULL;
@@ -454,7 +450,6 @@ static int korina_rx(struct net_device *dev, int limit)
 			~DMA_DESC_COD;
 
 		lp->rx_next_done = (lp->rx_next_done + 1) & KORINA_RDS_MASK;
-		dma_cache_wback((u32)rd, sizeof(*rd));
 		rd = &lp->rd_ring[lp->rx_next_done];
 		writel(~DMA_STAT_DONE, &lp->rx_dma_regs->dmas);
 	}
@@ -469,7 +464,6 @@ static int korina_rx(struct net_device *dev, int limit)
 		rd->devcs = 0;
 		skb = lp->rx_skb[lp->rx_next_done];
 		rd->ca = CPHYSADDR(skb->data);
-		dma_cache_wback((u32)rd, sizeof(*rd));
 		korina_chain_rx(lp, rd);
 	}
 
-- 
2.29.2

[PATCH net-next 4/7] net: korina: Remove nested helpers

[Thomas Bogendoerfer]

Remove helpers, which are only used in one call site.

Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
---
 drivers/net/ethernet/korina.c | 28 +++-------------------------
 1 file changed, 3 insertions(+), 25 deletions(-)

diff --git a/drivers/net/ethernet/korina.c b/drivers/net/ethernet/korina.c
index b6dcbb6d5e05..728c4baa3eee 100644
--- a/drivers/net/ethernet/korina.c
+++ b/drivers/net/ethernet/korina.c
@@ -141,12 +141,6 @@ struct korina_private {
 
 extern unsigned int idt_cpu_freq;
 
-static inline void korina_start_dma(struct dma_reg *ch, u32 dma_addr)
-{
-	writel(0, &ch->dmandptr);
-	writel(dma_addr, &ch->dmadptr);
-}
-
 static inline void korina_abort_dma(struct net_device *dev,
 					struct dma_reg *ch)
 {
@@ -163,11 +157,6 @@ static inline void korina_abort_dma(struct net_device *dev,
 	writel(0, &ch->dmandptr);
 }
 
-static inline void korina_chain_dma(struct dma_reg *ch, u32 dma_addr)
-{
-	writel(dma_addr, &ch->dmandptr);
-}
-
 static void korina_abort_tx(struct net_device *dev)
 {
 	struct korina_private *lp = netdev_priv(dev);
@@ -182,18 +171,6 @@ static void korina_abort_rx(struct net_device *dev)
 	korina_abort_dma(dev, lp->rx_dma_regs);
 }
 
-static void korina_start_rx(struct korina_private *lp,
-					struct dma_desc *rd)
-{
-	korina_start_dma(lp->rx_dma_regs, CPHYSADDR(rd));
-}
-
-static void korina_chain_rx(struct korina_private *lp,
-					struct dma_desc *rd)
-{
-	korina_chain_dma(lp->rx_dma_regs, CPHYSADDR(rd));
-}
-
 /* transmit packet */
 static int korina_send_packet(struct sk_buff *skb, struct net_device *dev)
 {
@@ -464,7 +441,7 @@ static int korina_rx(struct net_device *dev, int limit)
 		rd->devcs = 0;
 		skb = lp->rx_skb[lp->rx_next_done];
 		rd->ca = CPHYSADDR(skb->data);
-		korina_chain_rx(lp, rd);
+		writel(CPHYSADDR(rd), &lp->rx_dma_regs->dmandptr);
 	}
 
 	return count;
@@ -841,7 +818,8 @@ static int korina_init(struct net_device *dev)
 
 	writel(0, &lp->rx_dma_regs->dmas);
 	/* Start Rx DMA */
-	korina_start_rx(lp, &lp->rd_ring[0]);
+	writel(0, &lp->rx_dma_regs->dmandptr);
+	writel(CPHYSADDR(&lp->rd_ring[0]), &lp->rx_dma_regs->dmadptr);
 
 	writel(readl(&lp->tx_dma_regs->dmasm) &
 			~(DMA_STAT_FINI | DMA_STAT_ERR),
-- 
2.29.2

[PATCH net-next 5/7] net: korina: Use DMA API

[Thomas Bogendoerfer]

Instead of messing with MIPS specific macros use DMA API for mapping
descriptors and skbs.

Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
---
 drivers/net/ethernet/korina.c | 143 ++++++++++++++++++++--------------
 1 file changed, 85 insertions(+), 58 deletions(-)

diff --git a/drivers/net/ethernet/korina.c b/drivers/net/ethernet/korina.c
index 728c4baa3eee..0224cd179b03 100644
--- a/drivers/net/ethernet/korina.c
+++ b/drivers/net/ethernet/korina.c
@@ -109,6 +109,8 @@ struct korina_private {
 	struct dma_reg __iomem *tx_dma_regs;
 	struct dma_desc *td_ring; /* transmit descriptor ring */
 	struct dma_desc *rd_ring; /* receive descriptor ring  */
+	dma_addr_t td_dma;
+	dma_addr_t rd_dma;
 
 	struct sk_buff *tx_skb[KORINA_NUM_TDS];
 	struct sk_buff *rx_skb[KORINA_NUM_RDS];
@@ -137,10 +139,21 @@ struct korina_private {
 	struct mii_if_info mii_if;
 	struct work_struct restart_task;
 	struct net_device *dev;
+	struct device *dmadev;
 };
 
 extern unsigned int idt_cpu_freq;
 
+static dma_addr_t korina_tx_dma(struct korina_private *lp, int idx)
+{
+	return lp->td_dma + (idx * sizeof(struct dma_desc));
+}
+
+static dma_addr_t korina_rx_dma(struct korina_private *lp, int idx)
+{
+	return lp->rd_dma + (idx * sizeof(struct dma_desc));
+}
+
 static inline void korina_abort_dma(struct net_device *dev,
 					struct dma_reg *ch)
 {
@@ -179,10 +192,12 @@ static int korina_send_packet(struct sk_buff *skb, struct net_device *dev)
 	u32 length;
 	u32 chain_prev, chain_next;
 	struct dma_desc *td;
+	int idx;
 
 	spin_lock_irqsave(&lp->lock, flags);
 
-	td = &lp->td_ring[lp->tx_chain_tail];
+	idx = lp->tx_chain_tail;
+	td = &lp->td_ring[idx];
 
 	/* stop queue when full, drop pkts if queue already full */
 	if (lp->tx_count >= (KORINA_NUM_TDS - 2)) {
@@ -190,26 +205,23 @@ static int korina_send_packet(struct sk_buff *skb, struct net_device *dev)
 
 		if (lp->tx_count == (KORINA_NUM_TDS - 2))
 			netif_stop_queue(dev);
-		else {
-			dev->stats.tx_dropped++;
-			dev_kfree_skb_any(skb);
-			spin_unlock_irqrestore(&lp->lock, flags);
-
-			return NETDEV_TX_OK;
-		}
+		else
+			goto drop_packet;
 	}
 
 	lp->tx_count++;
 
-	lp->tx_skb[lp->tx_chain_tail] = skb;
+	lp->tx_skb[idx] = skb;
 
 	length = skb->len;
-	dma_cache_wback((u32)skb->data, skb->len);
 
 	/* Setup the transmit descriptor. */
-	td->ca = CPHYSADDR(skb->data);
-	chain_prev = (lp->tx_chain_tail - 1) & KORINA_TDS_MASK;
-	chain_next = (lp->tx_chain_tail + 1) & KORINA_TDS_MASK;
+	td->ca = dma_map_single(lp->dmadev, skb->data, length, DMA_TO_DEVICE);
+	if (dma_mapping_error(lp->dmadev, td->ca))
+		goto drop_packet;
+
+	chain_prev = (idx - 1) & KORINA_TDS_MASK;
+	chain_next = (idx + 1) & KORINA_TDS_MASK;
 
 	if (readl(&(lp->tx_dma_regs->dmandptr)) == 0) {
 		if (lp->tx_chain_status == desc_empty) {
@@ -219,8 +231,8 @@ static int korina_send_packet(struct sk_buff *skb, struct net_device *dev)
 			/* Move tail */
 			lp->tx_chain_tail = chain_next;
 			/* Write to NDPTR */
-			writel(CPHYSADDR(&lp->td_ring[lp->tx_chain_head]),
-					&lp->tx_dma_regs->dmandptr);
+			writel(korina_tx_dma(lp, lp->tx_chain_head),
+			       &lp->tx_dma_regs->dmandptr);
 			/* Move head to tail */
 			lp->tx_chain_head = lp->tx_chain_tail;
 		} else {
@@ -231,12 +243,12 @@ static int korina_send_packet(struct sk_buff *skb, struct net_device *dev)
 			lp->td_ring[chain_prev].control &=
 					~DMA_DESC_COF;
 			/* Link to prev */
-			lp->td_ring[chain_prev].link =  CPHYSADDR(td);
+			lp->td_ring[chain_prev].link = korina_tx_dma(lp, idx);
 			/* Move tail */
 			lp->tx_chain_tail = chain_next;
 			/* Write to NDPTR */
-			writel(CPHYSADDR(&lp->td_ring[lp->tx_chain_head]),
-					&(lp->tx_dma_regs->dmandptr));
+			writel(korina_tx_dma(lp, lp->tx_chain_head),
+			       &lp->tx_dma_regs->dmandptr);
 			/* Move head to tail */
 			lp->tx_chain_head = lp->tx_chain_tail;
 			lp->tx_chain_status = desc_empty;
@@ -255,7 +267,7 @@ static int korina_send_packet(struct sk_buff *skb, struct net_device *dev)
 					DMA_DESC_COF | DMA_DESC_IOF;
 			lp->td_ring[chain_prev].control &=
 					~DMA_DESC_COF;
-			lp->td_ring[chain_prev].link =  CPHYSADDR(td);
+			lp->td_ring[chain_prev].link = korina_tx_dma(lp, idx);
 			lp->tx_chain_tail = chain_next;
 		}
 	}
@@ -263,6 +275,13 @@ static int korina_send_packet(struct sk_buff *skb, struct net_device *dev)
 	netif_trans_update(dev);
 	spin_unlock_irqrestore(&lp->lock, flags);
 
+	return NETDEV_TX_OK;
+
+drop_packet:
+	dev->stats.tx_dropped++;
+	dev_kfree_skb_any(skb);
+	spin_unlock_irqrestore(&lp->lock, flags);
+
 	return NETDEV_TX_OK;
 }
 
@@ -345,8 +364,8 @@ static int korina_rx(struct net_device *dev, int limit)
 	struct korina_private *lp = netdev_priv(dev);
 	struct dma_desc *rd = &lp->rd_ring[lp->rx_next_done];
 	struct sk_buff *skb, *skb_new;
-	u8 *pkt_buf;
 	u32 devcs, pkt_len, dmas;
+	dma_addr_t ca;
 	int count;
 
 	for (count = 0; count < limit; count++) {
@@ -358,6 +377,8 @@ static int korina_rx(struct net_device *dev, int limit)
 		if ((KORINA_RBSIZE - (u32)DMA_COUNT(rd->control)) == 0)
 			break;
 
+		ca = rd->ca;
+
 		/* check that this is a whole packet
 		 * WARNING: DMA_FD bit incorrectly set
 		 * in Rc32434 (errata ref #077) */
@@ -382,20 +403,21 @@ static int korina_rx(struct net_device *dev, int limit)
 			goto next;
 		}
 
-		pkt_len = RCVPKT_LENGTH(devcs);
-
-		/* must be the (first and) last
-		 * descriptor then */
-		pkt_buf = (u8 *)lp->rx_skb[lp->rx_next_done]->data;
-
-		/* invalidate the cache */
-		dma_cache_inv((unsigned long)pkt_buf, pkt_len - 4);
-
 		/* Malloc up new buffer. */
 		skb_new = netdev_alloc_skb_ip_align(dev, KORINA_RBSIZE);
-
 		if (!skb_new)
 			break;
+
+		ca = dma_map_single(lp->dmadev, skb_new->data, KORINA_RBSIZE,
+				    DMA_FROM_DEVICE);
+		if (dma_mapping_error(lp->dmadev, ca)) {
+			dev_kfree_skb_any(skb_new);
+			break;
+		}
+
+		pkt_len = RCVPKT_LENGTH(devcs);
+		dma_unmap_single(lp->dmadev, rd->ca, pkt_len, DMA_FROM_DEVICE);
+
 		/* Do not count the CRC */
 		skb_put(skb, pkt_len - 4);
 		skb->protocol = eth_type_trans(skb, dev);
@@ -415,10 +437,7 @@ static int korina_rx(struct net_device *dev, int limit)
 		rd->devcs = 0;
 
 		/* Restore descriptor's curr_addr */
-		if (skb_new)
-			rd->ca = CPHYSADDR(skb_new->data);
-		else
-			rd->ca = CPHYSADDR(skb->data);
+		rd->ca = ca;
 
 		rd->control = DMA_COUNT(KORINA_RBSIZE) |
 			DMA_DESC_COD | DMA_DESC_IOD;
@@ -439,9 +458,8 @@ static int korina_rx(struct net_device *dev, int limit)
 
 		lp->dma_halt_cnt++;
 		rd->devcs = 0;
-		skb = lp->rx_skb[lp->rx_next_done];
-		rd->ca = CPHYSADDR(skb->data);
-		writel(CPHYSADDR(rd), &lp->rx_dma_regs->dmandptr);
+		writel(korina_rx_dma(lp, rd - lp->rd_ring),
+		       &lp->rx_dma_regs->dmandptr);
 	}
 
 	return count;
@@ -564,6 +582,9 @@ static void korina_tx(struct net_device *dev)
 
 		/* We must always free the original skb */
 		if (lp->tx_skb[lp->tx_next_done]) {
+			dma_unmap_single(lp->dmadev, td->ca,
+					 lp->tx_skb[lp->tx_next_done]->len,
+					 DMA_TO_DEVICE);
 			dev_kfree_skb_any(lp->tx_skb[lp->tx_next_done]);
 			lp->tx_skb[lp->tx_next_done] = NULL;
 		}
@@ -610,8 +631,8 @@ korina_tx_dma_interrupt(int irq, void *dev_id)
 
 		if (lp->tx_chain_status == desc_filled &&
 			(readl(&(lp->tx_dma_regs->dmandptr)) == 0)) {
-			writel(CPHYSADDR(&lp->td_ring[lp->tx_chain_head]),
-				&(lp->tx_dma_regs->dmandptr));
+			writel(korina_tx_dma(lp, lp->tx_chain_head),
+			       &lp->tx_dma_regs->dmandptr);
 			lp->tx_chain_status = desc_empty;
 			lp->tx_chain_head = lp->tx_chain_tail;
 			netif_trans_update(dev);
@@ -753,13 +774,17 @@ static int korina_alloc_ring(struct net_device *dev)
 		lp->rd_ring[i].control = DMA_DESC_IOD |
 				DMA_COUNT(KORINA_RBSIZE);
 		lp->rd_ring[i].devcs = 0;
-		lp->rd_ring[i].ca = CPHYSADDR(skb->data);
-		lp->rd_ring[i].link = CPHYSADDR(&lp->rd_ring[i+1]);
+		lp->rd_ring[i].ca = dma_map_single(lp->dmadev, skb->data,
+						   KORINA_RBSIZE,
+						   DMA_FROM_DEVICE);
+		if (dma_mapping_error(lp->dmadev, lp->rd_ring[i].ca))
+			return -ENOMEM;
+		lp->rd_ring[i].link = korina_rx_dma(lp, i + 1);
 	}
 
 	/* loop back receive descriptors, so the last
 	 * descriptor points to the first one */
-	lp->rd_ring[i - 1].link = CPHYSADDR(&lp->rd_ring[0]);
+	lp->rd_ring[i - 1].link = lp->rd_dma;
 	lp->rd_ring[i - 1].control |= DMA_DESC_COD;
 
 	lp->rx_next_done  = 0;
@@ -777,16 +802,22 @@ static void korina_free_ring(struct net_device *dev)
 
 	for (i = 0; i < KORINA_NUM_RDS; i++) {
 		lp->rd_ring[i].control = 0;
-		if (lp->rx_skb[i])
+		if (lp->rx_skb[i]) {
+			dma_unmap_single(lp->dmadev, lp->rd_ring[i].ca,
+					 KORINA_RBSIZE, DMA_FROM_DEVICE);
 			dev_kfree_skb_any(lp->rx_skb[i]);
-		lp->rx_skb[i] = NULL;
+			lp->rx_skb[i] = NULL;
+		}
 	}
 
 	for (i = 0; i < KORINA_NUM_TDS; i++) {
 		lp->td_ring[i].control = 0;
-		if (lp->tx_skb[i])
+		if (lp->tx_skb[i]) {
+			dma_unmap_single(lp->dmadev, lp->td_ring[i].ca,
+					 lp->tx_skb[i]->len, DMA_TO_DEVICE);
 			dev_kfree_skb_any(lp->tx_skb[i]);
-		lp->tx_skb[i] = NULL;
+			lp->tx_skb[i] = NULL;
+		}
 	}
 }
 
@@ -819,7 +850,7 @@ static int korina_init(struct net_device *dev)
 	writel(0, &lp->rx_dma_regs->dmas);
 	/* Start Rx DMA */
 	writel(0, &lp->rx_dma_regs->dmandptr);
-	writel(CPHYSADDR(&lp->rd_ring[0]), &lp->rx_dma_regs->dmadptr);
+	writel(korina_rx_dma(lp, 0), &lp->rx_dma_regs->dmadptr);
 
 	writel(readl(&lp->tx_dma_regs->dmasm) &
 			~(DMA_STAT_FINI | DMA_STAT_ERR),
@@ -1054,21 +1085,21 @@ static int korina_probe(struct platform_device *pdev)
 	}
 	lp->tx_dma_regs = p;
 
-	lp->td_ring = kmalloc(TD_RING_SIZE + RD_RING_SIZE, GFP_KERNEL);
+	lp->td_ring = dmam_alloc_coherent(&pdev->dev, TD_RING_SIZE,
+					  &lp->td_dma, GFP_KERNEL);
 	if (!lp->td_ring)
 		return -ENOMEM;
 
-	dma_cache_inv((unsigned long)(lp->td_ring),
-			TD_RING_SIZE + RD_RING_SIZE);
-
-	/* now convert TD_RING pointer to KSEG1 */
-	lp->td_ring = (struct dma_desc *)KSEG1ADDR(lp->td_ring);
-	lp->rd_ring = &lp->td_ring[KORINA_NUM_TDS];
+	lp->rd_ring = dmam_alloc_coherent(&pdev->dev, RD_RING_SIZE,
+					  &lp->rd_dma, GFP_KERNEL);
+	if (!lp->rd_ring)
+		return -ENOMEM;
 
 	spin_lock_init(&lp->lock);
 	/* just use the rx dma irq */
 	dev->irq = lp->rx_irq;
 	lp->dev = dev;
+	lp->dmadev = &pdev->dev;
 
 	dev->netdev_ops = &korina_netdev_ops;
 	dev->ethtool_ops = &netdev_ethtool_ops;
@@ -1086,7 +1117,6 @@ static int korina_probe(struct platform_device *pdev)
 	if (rc < 0) {
 		printk(KERN_ERR DRV_NAME
 			": cannot register net device: %d\n", rc);
-		kfree((struct dma_desc *)KSEG0ADDR(lp->td_ring));
 		return rc;
 	}
 	timer_setup(&lp->media_check_timer, korina_poll_media, 0);
@@ -1101,9 +1131,6 @@ static int korina_probe(struct platform_device *pdev)
 static int korina_remove(struct platform_device *pdev)
 {
 	struct korina_device *bif = platform_get_drvdata(pdev);
-	struct korina_private *lp = netdev_priv(bif->dev);
-
-	kfree((struct dma_desc *)KSEG0ADDR(lp->td_ring));
 
 	unregister_netdev(bif->dev);
 
-- 
2.29.2

[PATCH net-next 6/7] net: korina: Only pass mac address via platform data

[Thomas Bogendoerfer]

Get rid of access to struct korina_device by just passing the mac
address via platform data and use drvdata for passing netdev to remove
function.

Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
---
 arch/mips/rb532/devices.c     |  5 +++--
 drivers/net/ethernet/korina.c | 11 ++++++-----
 2 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/arch/mips/rb532/devices.c b/arch/mips/rb532/devices.c
index dd34f1b32b79..5fc3c8ee4f31 100644
--- a/arch/mips/rb532/devices.c
+++ b/arch/mips/rb532/devices.c
@@ -105,6 +105,9 @@ static struct platform_device korina_dev0 = {
 	.name = "korina",
 	.resource = korina_dev0_res,
 	.num_resources = ARRAY_SIZE(korina_dev0_res),
+	.dev = {
+		.platform_data = &korina_dev0_data.mac,
+	}
 };
 
 static struct resource cf_slot0_res[] = {
@@ -299,8 +302,6 @@ static int __init plat_setup_devices(void)
 	/* set the uart clock to the current cpu frequency */
 	rb532_uart_res[0].uartclk = idt_cpu_freq;
 
-	dev_set_drvdata(&korina_dev0.dev, &korina_dev0_data);
-
 	gpiod_add_lookup_table(&cf_slot0_gpio_table);
 	return platform_add_devices(rb532_devs, ARRAY_SIZE(rb532_devs));
 }
diff --git a/drivers/net/ethernet/korina.c b/drivers/net/ethernet/korina.c
index 0224cd179b03..d7972965eb14 100644
--- a/drivers/net/ethernet/korina.c
+++ b/drivers/net/ethernet/korina.c
@@ -1045,7 +1045,7 @@ static const struct net_device_ops korina_netdev_ops = {
 
 static int korina_probe(struct platform_device *pdev)
 {
-	struct korina_device *bif = platform_get_drvdata(pdev);
+	u8 *mac_addr = dev_get_platdata(&pdev->dev);
 	struct korina_private *lp;
 	struct net_device *dev;
 	void __iomem *p;
@@ -1058,8 +1058,7 @@ static int korina_probe(struct platform_device *pdev)
 	SET_NETDEV_DEV(dev, &pdev->dev);
 	lp = netdev_priv(dev);
 
-	bif->dev = dev;
-	memcpy(dev->dev_addr, bif->mac, ETH_ALEN);
+	memcpy(dev->dev_addr, mac_addr, ETH_ALEN);
 
 	lp->rx_irq = platform_get_irq_byname(pdev, "korina_rx");
 	lp->tx_irq = platform_get_irq_byname(pdev, "korina_tx");
@@ -1113,6 +1112,8 @@ static int korina_probe(struct platform_device *pdev)
 	lp->mii_if.phy_id_mask = 0x1f;
 	lp->mii_if.reg_num_mask = 0x1f;
 
+	platform_set_drvdata(pdev, dev);
+
 	rc = register_netdev(dev);
 	if (rc < 0) {
 		printk(KERN_ERR DRV_NAME
@@ -1130,9 +1131,9 @@ static int korina_probe(struct platform_device *pdev)
 
 static int korina_remove(struct platform_device *pdev)
 {
-	struct korina_device *bif = platform_get_drvdata(pdev);
+	struct net_device *dev = platform_get_drvdata(pdev);
 
-	unregister_netdev(bif->dev);
+	unregister_netdev(dev);
 
 	return 0;
 }
-- 
2.29.2

[PATCH net-next 7/7] net: korina: Make driver COMPILE_TESTable

[Thomas Bogendoerfer]

Move structs/defines for ethernet/dma register into driver, since they
are only used for this driver and remove any MIPS specific includes.
This makes it possible to COMPILE_TEST the driver.

Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
---
 drivers/net/ethernet/Kconfig  |   2 +-
 drivers/net/ethernet/korina.c | 245 ++++++++++++++++++++++++++++++++--
 2 files changed, 236 insertions(+), 11 deletions(-)

diff --git a/drivers/net/ethernet/Kconfig b/drivers/net/ethernet/Kconfig
index ad04660b97b8..c61368968cee 100644
--- a/drivers/net/ethernet/Kconfig
+++ b/drivers/net/ethernet/Kconfig
@@ -97,7 +97,7 @@ config JME
 
 config KORINA
 	tristate "Korina (IDT RC32434) Ethernet support"
-	depends on MIKROTIK_RB532
+	depends on MIKROTIK_RB532 || COMPILE_TEST
 	help
 	  If you have a Mikrotik RouterBoard 500 or IDT RC32434
 	  based system say Y. Otherwise say N.
diff --git a/drivers/net/ethernet/korina.c b/drivers/net/ethernet/korina.c
index d7972965eb14..98aa7f007f8e 100644
--- a/drivers/net/ethernet/korina.c
+++ b/drivers/net/ethernet/korina.c
@@ -55,20 +55,244 @@
 #include <linux/crc32.h>
 #include <linux/pgtable.h>
 
-#include <asm/bootinfo.h>
-#include <asm/bitops.h>
-#include <asm/io.h>
-#include <asm/dma.h>
-
-#include <asm/mach-rc32434/rb.h>
-#include <asm/mach-rc32434/rc32434.h>
-#include <asm/mach-rc32434/eth.h>
-#include <asm/mach-rc32434/dma_v.h>
-
 #define DRV_NAME	"korina"
 #define DRV_VERSION	"0.20"
 #define DRV_RELDATE	"15Sep2017"
 
+struct eth_regs {
+	u32 ethintfc;
+	u32 ethfifott;
+	u32 etharc;
+	u32 ethhash0;
+	u32 ethhash1;
+	u32 ethu0[4];		/* Reserved. */
+	u32 ethpfs;
+	u32 ethmcp;
+	u32 eth_u1[10];		/* Reserved. */
+	u32 ethspare;
+	u32 eth_u2[42];		/* Reserved. */
+	u32 ethsal0;
+	u32 ethsah0;
+	u32 ethsal1;
+	u32 ethsah1;
+	u32 ethsal2;
+	u32 ethsah2;
+	u32 ethsal3;
+	u32 ethsah3;
+	u32 ethrbc;
+	u32 ethrpc;
+	u32 ethrupc;
+	u32 ethrfc;
+	u32 ethtbc;
+	u32 ethgpf;
+	u32 eth_u9[50];		/* Reserved. */
+	u32 ethmac1;
+	u32 ethmac2;
+	u32 ethipgt;
+	u32 ethipgr;
+	u32 ethclrt;
+	u32 ethmaxf;
+	u32 eth_u10;		/* Reserved. */
+	u32 ethmtest;
+	u32 miimcfg;
+	u32 miimcmd;
+	u32 miimaddr;
+	u32 miimwtd;
+	u32 miimrdd;
+	u32 miimind;
+	u32 eth_u11;		/* Reserved. */
+	u32 eth_u12;		/* Reserved. */
+	u32 ethcfsa0;
+	u32 ethcfsa1;
+	u32 ethcfsa2;
+};
+
+/* Ethernet interrupt registers */
+#define ETH_INT_FC_EN		BIT(0)
+#define ETH_INT_FC_ITS		BIT(1)
+#define ETH_INT_FC_RIP		BIT(2)
+#define ETH_INT_FC_JAM		BIT(3)
+#define ETH_INT_FC_OVR		BIT(4)
+#define ETH_INT_FC_UND		BIT(5)
+#define ETH_INT_FC_IOC		0x000000c0
+
+/* Ethernet FIFO registers */
+#define ETH_FIFI_TT_TTH_BIT	0
+#define ETH_FIFO_TT_TTH		0x0000007f
+
+/* Ethernet ARC/multicast registers */
+#define ETH_ARC_PRO		BIT(0)
+#define ETH_ARC_AM		BIT(1)
+#define ETH_ARC_AFM		BIT(2)
+#define ETH_ARC_AB		BIT(3)
+
+/* Ethernet SAL registers */
+#define ETH_SAL_BYTE_5		0x000000ff
+#define ETH_SAL_BYTE_4		0x0000ff00
+#define ETH_SAL_BYTE_3		0x00ff0000
+#define ETH_SAL_BYTE_2		0xff000000
+
+/* Ethernet SAH registers */
+#define ETH_SAH_BYTE1		0x000000ff
+#define ETH_SAH_BYTE0		0x0000ff00
+
+/* Ethernet GPF register */
+#define ETH_GPF_PTV		0x0000ffff
+
+/* Ethernet PFG register */
+#define ETH_PFS_PFD		BIT(0)
+
+/* Ethernet CFSA[0-3] registers */
+#define ETH_CFSA0_CFSA4		0x000000ff
+#define ETH_CFSA0_CFSA5		0x0000ff00
+#define ETH_CFSA1_CFSA2		0x000000ff
+#define ETH_CFSA1_CFSA3		0x0000ff00
+#define ETH_CFSA1_CFSA0		0x000000ff
+#define ETH_CFSA1_CFSA1		0x0000ff00
+
+/* Ethernet MAC1 registers */
+#define ETH_MAC1_RE		BIT(0)
+#define ETH_MAC1_PAF		BIT(1)
+#define ETH_MAC1_RFC		BIT(2)
+#define ETH_MAC1_TFC		BIT(3)
+#define ETH_MAC1_LB		BIT(4)
+#define ETH_MAC1_MR		BIT(31)
+
+/* Ethernet MAC2 registers */
+#define ETH_MAC2_FD		BIT(0)
+#define ETH_MAC2_FLC		BIT(1)
+#define ETH_MAC2_HFE		BIT(2)
+#define ETH_MAC2_DC		BIT(3)
+#define ETH_MAC2_CEN		BIT(4)
+#define ETH_MAC2_PE		BIT(5)
+#define ETH_MAC2_VPE		BIT(6)
+#define ETH_MAC2_APE		BIT(7)
+#define ETH_MAC2_PPE		BIT(8)
+#define ETH_MAC2_LPE		BIT(9)
+#define ETH_MAC2_NB		BIT(12)
+#define ETH_MAC2_BP		BIT(13)
+#define ETH_MAC2_ED		BIT(14)
+
+/* Ethernet IPGT register */
+#define ETH_IPGT		0x0000007f
+
+/* Ethernet IPGR registers */
+#define ETH_IPGR_IPGR2		0x0000007f
+#define ETH_IPGR_IPGR1		0x00007f00
+
+/* Ethernet CLRT registers */
+#define ETH_CLRT_MAX_RET	0x0000000f
+#define ETH_CLRT_COL_WIN	0x00003f00
+
+/* Ethernet MAXF register */
+#define ETH_MAXF		0x0000ffff
+
+/* Ethernet test registers */
+#define ETH_TEST_REG		BIT(2)
+#define ETH_MCP_DIV		0x000000ff
+
+/* MII registers */
+#define ETH_MII_CFG_RSVD	0x0000000c
+#define ETH_MII_CMD_RD		BIT(0)
+#define ETH_MII_CMD_SCN		BIT(1)
+#define ETH_MII_REG_ADDR	0x0000001f
+#define ETH_MII_PHY_ADDR	0x00001f00
+#define ETH_MII_WTD_DATA	0x0000ffff
+#define ETH_MII_RDD_DATA	0x0000ffff
+#define ETH_MII_IND_BSY		BIT(0)
+#define ETH_MII_IND_SCN		BIT(1)
+#define ETH_MII_IND_NV		BIT(2)
+
+/* Values for the DEVCS field of the Ethernet DMA Rx and Tx descriptors. */
+#define ETH_RX_FD		BIT(0)
+#define ETH_RX_LD		BIT(1)
+#define ETH_RX_ROK		BIT(2)
+#define ETH_RX_FM		BIT(3)
+#define ETH_RX_MP		BIT(4)
+#define ETH_RX_BP		BIT(5)
+#define ETH_RX_VLT		BIT(6)
+#define ETH_RX_CF		BIT(7)
+#define ETH_RX_OVR		BIT(8)
+#define ETH_RX_CRC		BIT(9)
+#define ETH_RX_CV		BIT(10)
+#define ETH_RX_DB		BIT(11)
+#define ETH_RX_LE		BIT(12)
+#define ETH_RX_LOR		BIT(13)
+#define ETH_RX_CES		BIT(14)
+#define ETH_RX_LEN_BIT		16
+#define ETH_RX_LEN		0xffff0000
+
+#define ETH_TX_FD		BIT(0)
+#define ETH_TX_LD		BIT(1)
+#define ETH_TX_OEN		BIT(2)
+#define ETH_TX_PEN		BIT(3)
+#define ETH_TX_CEN		BIT(4)
+#define ETH_TX_HEN		BIT(5)
+#define ETH_TX_TOK		BIT(6)
+#define ETH_TX_MP		BIT(7)
+#define ETH_TX_BP		BIT(8)
+#define ETH_TX_UND		BIT(9)
+#define ETH_TX_OF		BIT(10)
+#define ETH_TX_ED		BIT(11)
+#define ETH_TX_EC		BIT(12)
+#define ETH_TX_LC		BIT(13)
+#define ETH_TX_TD		BIT(14)
+#define ETH_TX_CRC		BIT(15)
+#define ETH_TX_LE		BIT(16)
+#define ETH_TX_CC		0x001E0000
+
+/* DMA descriptor (in physical memory). */
+struct dma_desc {
+	u32 control;			/* Control. use DMAD_* */
+	u32 ca;				/* Current Address. */
+	u32 devcs;			/* Device control and status. */
+	u32 link;			/* Next descriptor in chain. */
+};
+
+#define DMA_DESC_COUNT_BIT		0
+#define DMA_DESC_COUNT_MSK		0x0003ffff
+#define DMA_DESC_DS_BIT			20
+#define DMA_DESC_DS_MSK			0x00300000
+
+#define DMA_DESC_DEV_CMD_BIT		22
+#define DMA_DESC_DEV_CMD_MSK		0x01c00000
+
+/* DMA descriptors interrupts */
+#define DMA_DESC_COF			BIT(25) /* Chain on finished */
+#define DMA_DESC_COD			BIT(26) /* Chain on done */
+#define DMA_DESC_IOF			BIT(27) /* Interrupt on finished */
+#define DMA_DESC_IOD			BIT(28) /* Interrupt on done */
+#define DMA_DESC_TERM			BIT(29) /* Terminated */
+#define DMA_DESC_DONE			BIT(30) /* Done */
+#define DMA_DESC_FINI			BIT(31) /* Finished */
+
+/* DMA register (within Internal Register Map).  */
+struct dma_reg {
+	u32 dmac;		/* Control. */
+	u32 dmas;		/* Status. */
+	u32 dmasm;		/* Mask. */
+	u32 dmadptr;		/* Descriptor pointer. */
+	u32 dmandptr;		/* Next descriptor pointer. */
+};
+
+/* DMA channels specific registers */
+#define DMA_CHAN_RUN_BIT		BIT(0)
+#define DMA_CHAN_DONE_BIT		BIT(1)
+#define DMA_CHAN_MODE_BIT		BIT(2)
+#define DMA_CHAN_MODE_MSK		0x0000000c
+#define	 DMA_CHAN_MODE_AUTO		0
+#define	 DMA_CHAN_MODE_BURST		1
+#define	 DMA_CHAN_MODE_XFRT		2
+#define	 DMA_CHAN_MODE_RSVD		3
+#define DMA_CHAN_ACT_BIT		BIT(4)
+
+/* DMA status registers */
+#define DMA_STAT_FINI			BIT(0)
+#define DMA_STAT_DONE			BIT(1)
+#define DMA_STAT_CHAIN			BIT(2)
+#define DMA_STAT_ERR			BIT(3)
+#define DMA_STAT_HALT			BIT(4)
+
 #define STATION_ADDRESS_HIGH(dev) (((dev)->dev_addr[0] << 8) | \
 				   ((dev)->dev_addr[1]))
 #define STATION_ADDRESS_LOW(dev)  (((dev)->dev_addr[2] << 24) | \
@@ -98,6 +322,7 @@ enum chain_status {
 	desc_empty
 };
 
+#define DMA_COUNT(count)	((count) & DMA_DESC_COUNT_MSK)
 #define IS_DMA_FINISHED(X)	(((X) & (DMA_DESC_FINI)) != 0)
 #define IS_DMA_DONE(X)		(((X) & (DMA_DESC_DONE)) != 0)
 #define RCVPKT_LENGTH(X)	(((X) & ETH_RX_LEN) >> ETH_RX_LEN_BIT)
-- 
2.29.2

Re: [PATCH net-next 7/7] net: korina: Make driver COMPILE_TESTable

[kernel test robot]

[-- Attachment #1: Type: text/plain, Size: 13246 bytes --]

Hi Thomas,

I love your patch! Perhaps something to improve:

[auto build test WARNING on net-next/master]

url:    https://github.com/0day-ci/linux/commits/Thomas-Bogendoerfer/net-Korina-improvements/20210414-045102
base:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git 8ef7adc6beb2ef0bce83513dc9e4505e7b21e8c2
config: sparc-allyesconfig (attached as .config)
compiler: sparc64-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/c92cee3d78d891046f2668b2d82c375899d387a4
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Thomas-Bogendoerfer/net-Korina-improvements/20210414-045102
        git checkout c92cee3d78d891046f2668b2d82c375899d387a4
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=sparc 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   drivers/net/ethernet/korina.c: In function 'korina_rx':
>> drivers/net/ethernet/korina.c:675:10: warning: conversion from 'long unsigned int' to 'u32' {aka 'unsigned int'} changes value from '18446744073709551613' to '4294967293' [-Woverflow]
     675 |   writel(~DMA_STAT_DONE, &lp->rx_dma_regs->dmas);
   drivers/net/ethernet/korina.c:681:10: warning: conversion from 'long unsigned int' to 'u32' {aka 'unsigned int'} changes value from '18446744073709551591' to '4294967271' [-Woverflow]
     681 |   writel(~(DMA_STAT_HALT | DMA_STAT_ERR),
         |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +675 drivers/net/ethernet/korina.c

ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  586  
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  587  static int korina_rx(struct net_device *dev, int limit)
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  588  {
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  589  	struct korina_private *lp = netdev_priv(dev);
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  590  	struct dma_desc *rd = &lp->rd_ring[lp->rx_next_done];
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  591  	struct sk_buff *skb, *skb_new;
4cf83b664fc14f drivers/net/korina.c          Phil Sutter         2009-01-14  592  	u32 devcs, pkt_len, dmas;
69e8eeb0eae052 drivers/net/ethernet/korina.c Thomas Bogendoerfer 2021-04-13  593  	dma_addr_t ca;
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  594  	int count;
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  595  
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  596  	for (count = 0; count < limit; count++) {
4cf83b664fc14f drivers/net/korina.c          Phil Sutter         2009-01-14  597  		skb = lp->rx_skb[lp->rx_next_done];
4cf83b664fc14f drivers/net/korina.c          Phil Sutter         2009-01-14  598  		skb_new = NULL;
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  599  
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  600  		devcs = rd->devcs;
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  601  
4cf83b664fc14f drivers/net/korina.c          Phil Sutter         2009-01-14  602  		if ((KORINA_RBSIZE - (u32)DMA_COUNT(rd->control)) == 0)
4cf83b664fc14f drivers/net/korina.c          Phil Sutter         2009-01-14  603  			break;
4cf83b664fc14f drivers/net/korina.c          Phil Sutter         2009-01-14  604  
69e8eeb0eae052 drivers/net/ethernet/korina.c Thomas Bogendoerfer 2021-04-13  605  		ca = rd->ca;
69e8eeb0eae052 drivers/net/ethernet/korina.c Thomas Bogendoerfer 2021-04-13  606  
364a97f5d1ae31 drivers/net/ethernet/korina.c Roman Yeryomin      2017-09-17  607  		/* check that this is a whole packet
364a97f5d1ae31 drivers/net/ethernet/korina.c Roman Yeryomin      2017-09-17  608  		 * WARNING: DMA_FD bit incorrectly set
364a97f5d1ae31 drivers/net/ethernet/korina.c Roman Yeryomin      2017-09-17  609  		 * in Rc32434 (errata ref #077) */
364a97f5d1ae31 drivers/net/ethernet/korina.c Roman Yeryomin      2017-09-17  610  		if (!(devcs & ETH_RX_LD))
364a97f5d1ae31 drivers/net/ethernet/korina.c Roman Yeryomin      2017-09-17  611  			goto next;
364a97f5d1ae31 drivers/net/ethernet/korina.c Roman Yeryomin      2017-09-17  612  
364a97f5d1ae31 drivers/net/ethernet/korina.c Roman Yeryomin      2017-09-17  613  		if (!(devcs & ETH_RX_ROK)) {
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  614  			/* Update statistics counters */
364a97f5d1ae31 drivers/net/ethernet/korina.c Roman Yeryomin      2017-09-17  615  			dev->stats.rx_errors++;
364a97f5d1ae31 drivers/net/ethernet/korina.c Roman Yeryomin      2017-09-17  616  			dev->stats.rx_dropped++;
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  617  			if (devcs & ETH_RX_CRC)
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  618  				dev->stats.rx_crc_errors++;
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  619  			if (devcs & ETH_RX_LE)
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  620  				dev->stats.rx_length_errors++;
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  621  			if (devcs & ETH_RX_OVR)
b1011b375be106 drivers/net/korina.c          Phil Sutter         2010-05-29  622  				dev->stats.rx_fifo_errors++;
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  623  			if (devcs & ETH_RX_CV)
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  624  				dev->stats.rx_frame_errors++;
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  625  			if (devcs & ETH_RX_CES)
364a97f5d1ae31 drivers/net/ethernet/korina.c Roman Yeryomin      2017-09-17  626  				dev->stats.rx_frame_errors++;
364a97f5d1ae31 drivers/net/ethernet/korina.c Roman Yeryomin      2017-09-17  627  
364a97f5d1ae31 drivers/net/ethernet/korina.c Roman Yeryomin      2017-09-17  628  			goto next;
364a97f5d1ae31 drivers/net/ethernet/korina.c Roman Yeryomin      2017-09-17  629  		}
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  630  
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  631  		/* Malloc up new buffer. */
89d71a66c40d62 drivers/net/korina.c          Eric Dumazet        2009-10-13  632  		skb_new = netdev_alloc_skb_ip_align(dev, KORINA_RBSIZE);
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  633  		if (!skb_new)
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  634  			break;
69e8eeb0eae052 drivers/net/ethernet/korina.c Thomas Bogendoerfer 2021-04-13  635  
69e8eeb0eae052 drivers/net/ethernet/korina.c Thomas Bogendoerfer 2021-04-13  636  		ca = dma_map_single(lp->dmadev, skb_new->data, KORINA_RBSIZE,
69e8eeb0eae052 drivers/net/ethernet/korina.c Thomas Bogendoerfer 2021-04-13  637  				    DMA_FROM_DEVICE);
69e8eeb0eae052 drivers/net/ethernet/korina.c Thomas Bogendoerfer 2021-04-13  638  		if (dma_mapping_error(lp->dmadev, ca)) {
69e8eeb0eae052 drivers/net/ethernet/korina.c Thomas Bogendoerfer 2021-04-13  639  			dev_kfree_skb_any(skb_new);
69e8eeb0eae052 drivers/net/ethernet/korina.c Thomas Bogendoerfer 2021-04-13  640  			break;
69e8eeb0eae052 drivers/net/ethernet/korina.c Thomas Bogendoerfer 2021-04-13  641  		}
69e8eeb0eae052 drivers/net/ethernet/korina.c Thomas Bogendoerfer 2021-04-13  642  
69e8eeb0eae052 drivers/net/ethernet/korina.c Thomas Bogendoerfer 2021-04-13  643  		pkt_len = RCVPKT_LENGTH(devcs);
69e8eeb0eae052 drivers/net/ethernet/korina.c Thomas Bogendoerfer 2021-04-13  644  		dma_unmap_single(lp->dmadev, rd->ca, pkt_len, DMA_FROM_DEVICE);
69e8eeb0eae052 drivers/net/ethernet/korina.c Thomas Bogendoerfer 2021-04-13  645  
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  646  		/* Do not count the CRC */
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  647  		skb_put(skb, pkt_len - 4);
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  648  		skb->protocol = eth_type_trans(skb, dev);
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  649  
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  650  		/* Pass the packet to upper layers */
247c78f2bed0c4 drivers/net/ethernet/korina.c Roman Yeryomin      2017-09-17  651  		napi_gro_receive(&lp->napi, skb);
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  652  		dev->stats.rx_packets++;
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  653  		dev->stats.rx_bytes += pkt_len;
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  654  
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  655  		/* Update the mcast stats */
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  656  		if (devcs & ETH_RX_MP)
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  657  			dev->stats.multicast++;
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  658  
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  659  		lp->rx_skb[lp->rx_next_done] = skb_new;
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  660  
364a97f5d1ae31 drivers/net/ethernet/korina.c Roman Yeryomin      2017-09-17  661  next:
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  662  		rd->devcs = 0;
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  663  
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  664  		/* Restore descriptor's curr_addr */
69e8eeb0eae052 drivers/net/ethernet/korina.c Thomas Bogendoerfer 2021-04-13  665  		rd->ca = ca;
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  666  
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  667  		rd->control = DMA_COUNT(KORINA_RBSIZE) |
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  668  			DMA_DESC_COD | DMA_DESC_IOD;
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  669  		lp->rd_ring[(lp->rx_next_done - 1) &
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  670  			KORINA_RDS_MASK].control &=
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  671  			~DMA_DESC_COD;
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  672  
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  673  		lp->rx_next_done = (lp->rx_next_done + 1) & KORINA_RDS_MASK;
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  674  		rd = &lp->rd_ring[lp->rx_next_done];
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19 @675  		writel(~DMA_STAT_DONE, &lp->rx_dma_regs->dmas);
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  676  	}
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  677  
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  678  	dmas = readl(&lp->rx_dma_regs->dmas);
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  679  
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  680  	if (dmas & DMA_STAT_HALT) {
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  681  		writel(~(DMA_STAT_HALT | DMA_STAT_ERR),
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  682  				&lp->rx_dma_regs->dmas);
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  683  
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  684  		lp->dma_halt_cnt++;
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  685  		rd->devcs = 0;
69e8eeb0eae052 drivers/net/ethernet/korina.c Thomas Bogendoerfer 2021-04-13  686  		writel(korina_rx_dma(lp, rd - lp->rd_ring),
69e8eeb0eae052 drivers/net/ethernet/korina.c Thomas Bogendoerfer 2021-04-13  687  		       &lp->rx_dma_regs->dmandptr);
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  688  	}
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  689  
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  690  	return count;
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  691  }
ef11291bcd5f96 drivers/net/korina.c          Florian Fainelli    2008-03-19  692  

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

[-- Attachment #2: .config.gz --]
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Re: [PATCH net-next 7/7] net: korina: Make driver COMPILE_TESTable

[kernel test robot]

[-- Attachment #1: Type: text/plain, Size: 1418 bytes --]

Hi Thomas,

I love your patch! Yet something to improve:

[auto build test ERROR on net-next/master]

url:    https://github.com/0day-ci/linux/commits/Thomas-Bogendoerfer/net-Korina-improvements/20210414-045102
base:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git 8ef7adc6beb2ef0bce83513dc9e4505e7b21e8c2
config: riscv-allmodconfig (attached as .config)
compiler: riscv64-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/c92cee3d78d891046f2668b2d82c375899d387a4
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Thomas-Bogendoerfer/net-Korina-improvements/20210414-045102
        git checkout c92cee3d78d891046f2668b2d82c375899d387a4
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=riscv 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>, old ones prefixed by <<):

>> ERROR: modpost: "idt_cpu_freq" [drivers/net/ethernet/korina.ko] undefined!

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

[-- Attachment #2: .config.gz --]
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