[PATCH 0/4] Sky2 update

[PATCH 0/4] Sky2 update

[Stephen Hemminger]

Here are some updates to sky2 driver for net-next.

-- 

[PATCH 1/4] sky2: remove unneede workaround

[Stephen Hemminger]

[-- Attachment #1: sky2-tim-opt.patch --]
[-- Type: text/plain, Size: 813 bytes --]

This workaround is not needed. It was inherited from sk98lin driver but only
applies to an early development version of the chip that is not supported
by sky2.  The workaround required an unnecessary pci read which hurts performance

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>


--- a/drivers/net/sky2.c	2009-01-26 17:23:25.869792360 -0800
+++ b/drivers/net/sky2.c	2009-01-27 09:43:21.770394724 -0800
@@ -2687,13 +2687,6 @@ static int sky2_poll(struct napi_struct 
 			goto done;
 	}
 
-	/* Bug/Errata workaround?
-	 * Need to kick the TX irq moderation timer.
-	 */
-	if (sky2_read8(hw, STAT_TX_TIMER_CTRL) == TIM_START) {
-		sky2_write8(hw, STAT_TX_TIMER_CTRL, TIM_STOP);
-		sky2_write8(hw, STAT_TX_TIMER_CTRL, TIM_START);
-	}
 	napi_complete(napi);
 	sky2_read32(hw, B0_Y2_SP_LISR);
 done:

-- 

[PATCH 2/4] sky2: handle dma mapping errors

[Stephen Hemminger]

[-- Attachment #1: sky2-dma-error.patch --]
[-- Type: text/plain, Size: 4145 bytes --]

On non-x86 platforms it is possible to run out of DMA mapping resources.
The driver was ignoring this and could cause corruptions.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>


---
 drivers/net/sky2.c |   64 ++++++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 56 insertions(+), 8 deletions(-)

--- a/drivers/net/sky2.c	2009-02-03 08:08:14.287767868 -0800
+++ b/drivers/net/sky2.c	2009-02-03 08:08:38.063805252 -0800
@@ -1068,13 +1068,16 @@ static void sky2_rx_submit(struct sky2_p
 }
 
 
-static void sky2_rx_map_skb(struct pci_dev *pdev, struct rx_ring_info *re,
+static int sky2_rx_map_skb(struct pci_dev *pdev, struct rx_ring_info *re,
 			    unsigned size)
 {
 	struct sk_buff *skb = re->skb;
 	int i;
 
 	re->data_addr = pci_map_single(pdev, skb->data, size, PCI_DMA_FROMDEVICE);
+	if (unlikely(pci_dma_mapping_error(pdev, re->data_addr)))
+		return -EIO;
+
 	pci_unmap_len_set(re, data_size, size);
 
 	for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
@@ -1083,6 +1086,7 @@ static void sky2_rx_map_skb(struct pci_d
 						skb_shinfo(skb)->frags[i].page_offset,
 						skb_shinfo(skb)->frags[i].size,
 						PCI_DMA_FROMDEVICE);
+	return 0;
 }
 
 static void sky2_rx_unmap_skb(struct pci_dev *pdev, struct rx_ring_info *re)
@@ -1354,7 +1358,12 @@ static int sky2_rx_start(struct sky2_por
 		if (!re->skb)
 			goto nomem;
 
-		sky2_rx_map_skb(hw->pdev, re, sky2->rx_data_size);
+		if (sky2_rx_map_skb(hw->pdev, re, sky2->rx_data_size)) {
+			dev_kfree_skb(re->skb);
+			re->skb = NULL;
+			goto nomem;
+		}
+
 		sky2_rx_submit(sky2, re);
 	}
 
@@ -1547,7 +1556,7 @@ static int sky2_xmit_frame(struct sk_buf
 	struct sky2_hw *hw = sky2->hw;
 	struct sky2_tx_le *le = NULL;
 	struct tx_ring_info *re;
-	unsigned i, len;
+	unsigned i, len, first_slot;
 	dma_addr_t mapping;
 	u16 mss;
 	u8 ctrl;
@@ -1555,13 +1564,17 @@ static int sky2_xmit_frame(struct sk_buf
  	if (unlikely(tx_avail(sky2) < tx_le_req(skb)))
   		return NETDEV_TX_BUSY;
 
-	if (unlikely(netif_msg_tx_queued(sky2)))
-		printk(KERN_DEBUG "%s: tx queued, slot %u, len %d\n",
-		       dev->name, sky2->tx_prod, skb->len);
-
 	len = skb_headlen(skb);
 	mapping = pci_map_single(hw->pdev, skb->data, len, PCI_DMA_TODEVICE);
 
+	if (pci_dma_mapping_error(hw->pdev, mapping))
+		goto mapping_error;
+
+	first_slot = sky2->tx_prod;
+	if (unlikely(netif_msg_tx_queued(sky2)))
+		printk(KERN_DEBUG "%s: tx queued, slot %u, len %d\n",
+		       dev->name, first_slot, skb->len);
+
 	/* Send high bits if needed */
 	if (sizeof(dma_addr_t) > sizeof(u32)) {
 		le = get_tx_le(sky2);
@@ -1648,6 +1661,9 @@ static int sky2_xmit_frame(struct sk_buf
 		mapping = pci_map_page(hw->pdev, frag->page, frag->page_offset,
 				       frag->size, PCI_DMA_TODEVICE);
 
+		if (pci_dma_mapping_error(hw->pdev, mapping))
+			goto mapping_unwind;
+
 		if (sizeof(dma_addr_t) > sizeof(u32)) {
 			le = get_tx_le(sky2);
 			le->addr = cpu_to_le32(upper_32_bits(mapping));
@@ -1676,6 +1692,34 @@ static int sky2_xmit_frame(struct sk_buf
 
 	dev->trans_start = jiffies;
 	return NETDEV_TX_OK;
+
+mapping_unwind:
+	for (i = first_slot; i != sky2->tx_prod; i = RING_NEXT(i, TX_RING_SIZE)) {
+		le = sky2->tx_le + i;
+		re = sky2->tx_ring + i;
+
+		switch(le->opcode & ~HW_OWNER) {
+		case OP_LARGESEND:
+		case OP_PACKET:
+			pci_unmap_single(hw->pdev,
+					 pci_unmap_addr(re, mapaddr),
+					 pci_unmap_len(re, maplen),
+					 PCI_DMA_TODEVICE);
+			break;
+		case OP_BUFFER:
+			pci_unmap_page(hw->pdev, pci_unmap_addr(re, mapaddr),
+				       pci_unmap_len(re, maplen),
+				       PCI_DMA_TODEVICE);
+			break;
+		}
+	}
+
+	sky2->tx_prod = first_slot;
+mapping_error:
+	if (net_ratelimit())
+		dev_warn(&hw->pdev->dev, "%s: tx mapping error\n", dev->name);
+	dev_kfree_skb(skb);
+	return NETDEV_TX_OK;
 }
 
 /*
@@ -2191,7 +2235,11 @@ static struct sk_buff *receive_new(struc
 
 	prefetch(skb->data);
 	re->skb = nskb;
-	sky2_rx_map_skb(sky2->hw->pdev, re, hdr_space);
+	if (sky2_rx_map_skb(sky2->hw->pdev, re, hdr_space)) {
+		dev_kfree_skb(nskb);
+		re->skb = skb;
+		return NULL;
+	}
 
 	if (skb_shinfo(skb)->nr_frags)
 		skb_put_frags(skb, hdr_space, length);

-- 

[PATCH 3/4] sky2: move VPD display into debug interface

[Stephen Hemminger]

[-- Attachment #1: sky2-vpd-debug.patch --]
[-- Type: text/plain, Size: 4478 bytes --]

The VPD stuff has more data and isn't generally that useful, so move
it into the existing debugfs display and use the new PCI VPD
accessor routines.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>

--- a/drivers/net/sky2.c	2009-02-03 08:08:38.063805252 -0800
+++ b/drivers/net/sky2.c	2009-02-03 08:09:02.960523549 -0800
@@ -3905,6 +3905,86 @@ static const struct ethtool_ops sky2_eth
 
 static struct dentry *sky2_debug;
 
+
+/*
+ * Read and parse the first part of Vital Product Data
+ */
+#define VPD_SIZE	128
+#define VPD_MAGIC	0x82
+
+static const struct vpd_tag {
+	char tag[2];
+	char *label;
+} vpd_tags[] = {
+	{ "PN",	"Part Number" },
+	{ "EC", "Engineering Level" },
+	{ "MN", "Manufacturer" },
+	{ "SN", "Serial Number" },
+	{ "YA", "Asset Tag" },
+	{ "VL", "First Error Log Message" },
+	{ "VF", "Second Error Log Message" },
+	{ "VB", "Boot Agent ROM Configuration" },
+	{ "VE", "EFI UNDI Configuration" },
+};
+
+static void sky2_show_vpd(struct seq_file *seq, struct sky2_hw *hw)
+{
+	size_t vpd_size;
+	loff_t offs;
+	u8 len;
+	unsigned char *buf;
+	u16 reg2;
+
+	reg2 = sky2_pci_read16(hw, PCI_DEV_REG2);
+	vpd_size = 1 << ( ((reg2 & PCI_VPD_ROM_SZ) >> 14) + 8);
+
+	seq_printf(seq, "%s Product Data\n", pci_name(hw->pdev));
+	buf = kmalloc(vpd_size, GFP_KERNEL);
+	if (!buf) {
+		seq_puts(seq, "no memory!\n");
+		return;
+	}
+
+	if (pci_read_vpd(hw->pdev, 0, vpd_size, buf) < 0) {
+		seq_puts(seq, "VPD read failed\n");
+		goto out;
+	}
+
+	if (buf[0] != VPD_MAGIC) {
+		seq_printf(seq, "VPD tag mismatch: %#x\n", buf[0]);
+		goto out;
+	}
+	len = buf[1];
+	if (len == 0 || len > vpd_size - 4) {
+		seq_printf(seq, "Invalid id length: %d\n", len);
+		goto out;
+	}
+
+	seq_printf(seq, "%.*s\n", len, buf + 3);
+	offs = len + 3;
+
+	while (offs < vpd_size - 4) {
+		int i;
+
+		if (!memcmp("RW", buf + offs, 2))	/* end marker */
+			break;
+		len = buf[offs + 2];
+		if (offs + len + 3 >= vpd_size)
+			break;
+
+		for (i = 0; i < ARRAY_SIZE(vpd_tags); i++) {
+			if (!memcmp(vpd_tags[i].tag, buf + offs, 2)) {
+				seq_printf(seq, " %s: %.*s\n",
+					   vpd_tags[i].label, len, buf + offs + 3);
+				break;
+			}
+		}
+		offs += len + 3;
+	}
+out:
+	kfree(buf);
+}
+
 static int sky2_debug_show(struct seq_file *seq, void *v)
 {
 	struct net_device *dev = seq->private;
@@ -3914,14 +3994,18 @@ static int sky2_debug_show(struct seq_fi
 	unsigned idx, last;
 	int sop;
 
-	if (!netif_running(dev))
-		return -ENETDOWN;
+	sky2_show_vpd(seq, hw);
 
-	seq_printf(seq, "IRQ src=%x mask=%x control=%x\n",
+	seq_printf(seq, "\nIRQ src=%x mask=%x control=%x\n",
 		   sky2_read32(hw, B0_ISRC),
 		   sky2_read32(hw, B0_IMSK),
 		   sky2_read32(hw, B0_Y2_SP_ICR));
 
+	if (!netif_running(dev)) {
+		seq_printf(seq, "network not running\n");
+		return 0;
+	}
+
 	napi_disable(&hw->napi);
 	last = sky2_read16(hw, STAT_PUT_IDX);
 
@@ -4245,69 +4329,6 @@ static int __devinit sky2_test_msi(struc
 	return err;
 }
 
-/*
- * Read and parse the first part of Vital Product Data
- */
-#define VPD_SIZE	128
-#define VPD_MAGIC	0x82
-
-static void __devinit sky2_vpd_info(struct sky2_hw *hw)
-{
-	int cap = pci_find_capability(hw->pdev, PCI_CAP_ID_VPD);
-	const u8 *p;
-	u8 *vpd_buf = NULL;
-	u16 len;
-	static struct vpd_tag {
-		char tag[2];
-		char *label;
-	} vpd_tags[] = {
-		{ "PN",	"Part Number" },
-		{ "EC", "Engineering Level" },
-		{ "MN", "Manufacturer" },
-	};
-
-	if (!cap)
-		goto out;
-
-	vpd_buf = kmalloc(VPD_SIZE, GFP_KERNEL);
-	if (!vpd_buf)
-		goto out;
-
-	if (sky2_vpd_read(hw, cap, vpd_buf, 0, VPD_SIZE))
-		goto out;
-
-	if (vpd_buf[0] != VPD_MAGIC)
-		goto out;
-	len = vpd_buf[1];
-	if (len == 0 || len > VPD_SIZE - 4)
-		goto out;
-	p = vpd_buf + 3;
-	dev_info(&hw->pdev->dev, "%.*s\n", len, p);
-	p += len;
-
-	while (p < vpd_buf + VPD_SIZE - 4) {
-		int i;
-
-		if (!memcmp("RW", p, 2))	/* end marker */
-			break;
-
-		len = p[2];
-		if (len > (p - vpd_buf) - 4)
-			break;
-
-		for (i = 0; i < ARRAY_SIZE(vpd_tags); i++) {
-			if (!memcmp(vpd_tags[i].tag, p, 2)) {
-				printk(KERN_DEBUG " %s: %.*s\n",
-				       vpd_tags[i].label, len, p + 3);
-				break;
-			}
-		}
-		p += len + 3;
-	}
-out:
-	kfree(vpd_buf);
-}
-
 /* This driver supports yukon2 chipset only */
 static const char *sky2_name(u8 chipid, char *buf, int sz)
 {
@@ -4411,8 +4432,6 @@ static int __devinit sky2_probe(struct p
 
 	sky2_reset(hw);
 
-	sky2_vpd_info(hw);
-
 	dev = sky2_init_netdev(hw, 0, using_dac, wol_default);
 	if (!dev) {
 		err = -ENOMEM;

-- 

[PATCH 4/4] sky2: set VPD size

[Stephen Hemminger]

[-- Attachment #1: sky2-vpd-size.patch --]
[-- Type: text/plain, Size: 2080 bytes --]

Read configuration register during probe and use it to size the
available VPD. Move existing code using same register slightly
earlier in probe handling.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>

--- a/drivers/net/sky2.c	2009-01-26 12:48:31.399586277 -0800
+++ b/drivers/net/sky2.c	2009-01-26 12:48:34.947586089 -0800
@@ -4335,6 +4335,7 @@ static int __devinit sky2_probe(struct p
 	struct net_device *dev;
 	struct sky2_hw *hw;
 	int err, using_dac = 0, wol_default;
+	u32 reg;
 	char buf1[16];
 
 	err = pci_enable_device(pdev);
@@ -4368,6 +4369,34 @@ static int __devinit sky2_probe(struct p
 		}
 	}
 
+	/* Get configuration information
+	 * Note: only regular PCI config access once to test for HW issues
+	 *       other PCI access through shared memory for speed and to
+	 *	 avoid MMCONFIG problems.
+	 */
+	err = pci_read_config_dword(pdev, PCI_DEV_REG2, &reg);
+	if (err) {
+		dev_err(&pdev->dev, "PCI read config failed\n");
+		goto err_out_free_regions;
+	}
+
+	/* size of available VPD, only impact sysfs */
+	err = pci_vpd_truncate(pdev, 1ul << (((reg & PCI_VPD_ROM_SZ) >> 14) + 8));
+	if (err)
+		dev_warn(&pdev->dev, "Can't set VPD size\n");
+
+#ifdef __BIG_ENDIAN
+	/* The sk98lin vendor driver uses hardware byte swapping but
+	 * this driver uses software swapping.
+	 */
+	reg &= ~PCI_REV_DESC;
+	err = pci_write_config_dword(pdev,PCI_DEV_REG2, reg);
+	if (err) {
+		dev_err(&pdev->dev, "PCI write config failed\n");
+		goto err_out_free_regions;
+	}
+#endif
+
 	wol_default = device_may_wakeup(&pdev->dev) ? WAKE_MAGIC : 0;
 
 	err = -ENOMEM;
@@ -4385,18 +4414,6 @@ static int __devinit sky2_probe(struct p
 		goto err_out_free_hw;
 	}
 
-#ifdef __BIG_ENDIAN
-	/* The sk98lin vendor driver uses hardware byte swapping but
-	 * this driver uses software swapping.
-	 */
-	{
-		u32 reg;
-		reg = sky2_pci_read32(hw, PCI_DEV_REG2);
-		reg &= ~PCI_REV_DESC;
-		sky2_pci_write32(hw, PCI_DEV_REG2, reg);
-	}
-#endif
-
 	/* ring for status responses */
 	hw->st_le = pci_alloc_consistent(pdev, STATUS_LE_BYTES, &hw->st_dma);
 	if (!hw->st_le)

-- 

Re: [PATCH 0/4] Sky2 update

[David Miller]

From: Stephen Hemminger <shemminger@vyatta.com>
Date: Tue, 03 Feb 2009 13:27:26 -0800

> Here are some updates to sky2 driver for net-next.

All applied, thanks Stephen.