[PATCH 0/8] skge/sky2 patches for net-next

[PATCH 0/8] skge/sky2 patches for net-next

[Stephen Hemminger]

1-7 have been reviewed several times but not accepted??
Last one is new.

-- 

[PATCH 1/8] PCI: vpd handle longer delays in access (rev4)

[Stephen Hemminger]

[-- Attachment #1: vpd-delay.patch --]
[-- Type: text/plain, Size: 4235 bytes --]

Accessing the VPD area can take a long time.  The existing 
VPD access code fails consistently on my hardware. There are comments
in the SysKonnect vendor driver that it can take up to 13ms per word. 

Change the access routines to:
  * use a mutex rather than spinning with IRQ's disabled and lock held
  * have a much longer timeout
  * call cond_resched while spinning

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Reviewed-by: Matthew Wilcox <willy@linux.intel.com>


---
 drivers/pci/access.c |   55 ++++++++++++++++++++++++++++++---------------------
 1 file changed, 33 insertions(+), 22 deletions(-)

--- a/drivers/pci/access.c	2008-10-25 08:52:24.000000000 -0700
+++ b/drivers/pci/access.c	2008-10-25 09:04:44.000000000 -0700
@@ -133,39 +133,46 @@ PCI_USER_WRITE_CONFIG(dword, u32)
 
 struct pci_vpd_pci22 {
 	struct pci_vpd base;
-	spinlock_t lock; /* controls access to hardware and the flags */
-	u8	cap;
+	struct mutex lock;
+	u16	flag;
 	bool	busy;
-	bool	flag; /* value of F bit to wait for */
+	u8	cap;
 };
 
-/* Wait for last operation to complete */
+/*
+ * Wait for last operation to complete.
+ * This code has to spin since there is no other notification from the PCI
+ * hardware. Since the VPD is often implemented by serial attachment to an
+ * EEPROM, it may take many milliseconds to complete.
+ */
 static int pci_vpd_pci22_wait(struct pci_dev *dev)
 {
 	struct pci_vpd_pci22 *vpd =
 		container_of(dev->vpd, struct pci_vpd_pci22, base);
-	u16 flag, status;
-	int wait;
+	unsigned long timeout = jiffies + HZ/20 + 2;
+	u16 status;
 	int ret;
 
 	if (!vpd->busy)
 		return 0;
 
-	flag = vpd->flag ? PCI_VPD_ADDR_F : 0;
-	wait = vpd->flag ? 10 : 1000; /* read: 100 us; write: 10 ms */
 	for (;;) {
-		ret = pci_user_read_config_word(dev,
-						vpd->cap + PCI_VPD_ADDR,
+		ret = pci_user_read_config_word(dev, vpd->cap + PCI_VPD_ADDR,
 						&status);
-		if (ret < 0)
+		if (ret)
 			return ret;
-		if ((status & PCI_VPD_ADDR_F) == flag) {
+
+		if ((status & PCI_VPD_ADDR_F) == vpd->flag) {
 			vpd->busy = false;
 			return 0;
 		}
-		if (wait-- == 0)
+
+		if (time_after(jiffies, timeout))
 			return -ETIMEDOUT;
-		udelay(10);
+		if (fatal_signal_pending(current))
+			return -EINTR;
+		if (!cond_resched())
+			udelay(10);
 	}
 }
 
@@ -175,7 +182,7 @@ static int pci_vpd_pci22_read(struct pci
 	struct pci_vpd_pci22 *vpd =
 		container_of(dev->vpd, struct pci_vpd_pci22, base);
 	u32 val;
-	int ret;
+	int ret = 0;
 	int begin, end, i;
 
 	if (pos < 0 || pos > vpd->base.len || size > vpd->base.len  - pos)
@@ -183,7 +190,9 @@ static int pci_vpd_pci22_read(struct pci
 	if (size == 0)
 		return 0;
 
-	spin_lock_irq(&vpd->lock);
+	if (mutex_lock_killable(&vpd->lock))
+		return -EINTR;
+
 	ret = pci_vpd_pci22_wait(dev);
 	if (ret < 0)
 		goto out;
@@ -191,15 +200,16 @@ static int pci_vpd_pci22_read(struct pci
 					 pos & ~3);
 	if (ret < 0)
 		goto out;
+
 	vpd->busy = true;
-	vpd->flag = 1;
+	vpd->flag = PCI_VPD_ADDR_F;
 	ret = pci_vpd_pci22_wait(dev);
 	if (ret < 0)
 		goto out;
 	ret = pci_user_read_config_dword(dev, vpd->cap + PCI_VPD_DATA,
 					 &val);
 out:
-	spin_unlock_irq(&vpd->lock);
+	mutex_unlock(&vpd->lock);
 	if (ret < 0)
 		return ret;
 
@@ -220,7 +230,7 @@ static int pci_vpd_pci22_write(struct pc
 	struct pci_vpd_pci22 *vpd =
 		container_of(dev->vpd, struct pci_vpd_pci22, base);
 	u32 val;
-	int ret;
+	int ret = 0;
 
 	if (pos < 0 || pos > vpd->base.len || pos & 3 ||
 	    size > vpd->base.len - pos || size < 4)
@@ -231,7 +241,8 @@ static int pci_vpd_pci22_write(struct pc
 	val |= ((u8) *buf++) << 16;
 	val |= ((u32)(u8) *buf++) << 24;
 
-	spin_lock_irq(&vpd->lock);
+	if (mutex_lock_killable(&vpd->lock))
+		return -EINTR;
 	ret = pci_vpd_pci22_wait(dev);
 	if (ret < 0)
 		goto out;
@@ -247,7 +258,7 @@ static int pci_vpd_pci22_write(struct pc
 	vpd->flag = 0;
 	ret = pci_vpd_pci22_wait(dev);
 out:
-	spin_unlock_irq(&vpd->lock);
+	mutex_unlock(&vpd->lock);
 	if (ret < 0)
 		return ret;
 
@@ -279,7 +290,7 @@ int pci_vpd_pci22_init(struct pci_dev *d
 
 	vpd->base.len = PCI_VPD_PCI22_SIZE;
 	vpd->base.ops = &pci_vpd_pci22_ops;
-	spin_lock_init(&vpd->lock);
+	mutex_init(&vpd->lock);
 	vpd->cap = cap;
 	vpd->busy = false;
 	dev->vpd = &vpd->base;

-- 

[PATCH 2/8] PCI: revise VPD access interface (rev3)

[Stephen Hemminger]

[-- Attachment #1: vpd-ops.patch --]
[-- Type: text/plain, Size: 9341 bytes --]

Change PCI VPD API which was only used by sysfs to something usable
in drivers. 
   * move iteration over multiple words to the low level
   * use conventional types for arguments
   * add exportable wrapper

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

---
 drivers/pci/access.c    |  156 ++++++++++++++++++++++++++++++------------------
 drivers/pci/pci-sysfs.c |   38 ++---------
 drivers/pci/pci.h       |    6 -
 include/linux/pci.h     |    4 +
 4 files changed, 114 insertions(+), 90 deletions(-)

--- a/drivers/pci/access.c	2008-10-25 09:01:46.000000000 -0700
+++ b/drivers/pci/access.c	2008-10-25 09:04:43.000000000 -0700
@@ -66,6 +66,39 @@ EXPORT_SYMBOL(pci_bus_write_config_byte)
 EXPORT_SYMBOL(pci_bus_write_config_word);
 EXPORT_SYMBOL(pci_bus_write_config_dword);
 
+
+/**
+ * pci_read_vpd - Read one entry from Vital Product Data
+ * @dev:	pci device struct
+ * @pos:	offset in vpd space
+ * @count:	number of bytes to read
+ * @buf:	pointer to where to store result
+ *
+ */
+ssize_t pci_read_vpd(struct pci_dev *dev, loff_t pos, size_t count, void *buf)
+{
+	if (!dev->vpd || !dev->vpd->ops)
+		return -ENODEV;
+	return dev->vpd->ops->read(dev, pos, count, buf);
+}
+EXPORT_SYMBOL(pci_read_vpd);
+
+/**
+ * pci_write_vpd - Write entry to Vital Product Data
+ * @dev:	pci device struct
+ * @pos:	offset in vpd space
+ * @count:	number of bytes to read
+ * @val:	value to write
+ *
+ */
+ssize_t pci_write_vpd(struct pci_dev *dev, loff_t pos, size_t count, const void *buf)
+{
+	if (!dev->vpd || !dev->vpd->ops)
+		return -ENODEV;
+	return dev->vpd->ops->write(dev, pos, count, buf);
+}
+EXPORT_SYMBOL(pci_write_vpd);
+
 /*
  * The following routines are to prevent the user from accessing PCI config
  * space when it's unsafe to do so.  Some devices require this during BIST and
@@ -176,19 +209,17 @@ static int pci_vpd_pci22_wait(struct pci
 	}
 }
 
-static int pci_vpd_pci22_read(struct pci_dev *dev, int pos, int size,
-			      char *buf)
+static ssize_t pci_vpd_pci22_read(struct pci_dev *dev, loff_t pos, size_t count,
+				  void *arg)
 {
 	struct pci_vpd_pci22 *vpd =
 		container_of(dev->vpd, struct pci_vpd_pci22, base);
-	u32 val;
-	int ret = 0;
-	int begin, end, i;
+	int ret;
+	loff_t end = pos + count;
+	u8 *buf = arg;
 
-	if (pos < 0 || pos > vpd->base.len || size > vpd->base.len  - pos)
+	if (pos < 0 || pos > vpd->base.len || end > vpd->base.len)
 		return -EINVAL;
-	if (size == 0)
-		return 0;
 
 	if (mutex_lock_killable(&vpd->lock))
 		return -EINTR;
@@ -196,73 +227,84 @@ static int pci_vpd_pci22_read(struct pci
 	ret = pci_vpd_pci22_wait(dev);
 	if (ret < 0)
 		goto out;
-	ret = pci_user_write_config_word(dev, vpd->cap + PCI_VPD_ADDR,
-					 pos & ~3);
-	if (ret < 0)
-		goto out;
 
-	vpd->busy = true;
-	vpd->flag = PCI_VPD_ADDR_F;
-	ret = pci_vpd_pci22_wait(dev);
-	if (ret < 0)
-		goto out;
-	ret = pci_user_read_config_dword(dev, vpd->cap + PCI_VPD_DATA,
-					 &val);
+	while (pos < end) {
+		u32 val;
+		unsigned int i, skip;
+
+		ret = pci_user_write_config_word(dev, vpd->cap + PCI_VPD_ADDR,
+						 pos & ~3);
+		if (ret < 0)
+			break;
+		vpd->busy = true;
+		vpd->flag = PCI_VPD_ADDR_F;
+		ret = pci_vpd_pci22_wait(dev);
+		if (ret < 0)
+			break;
+
+		ret = pci_user_read_config_dword(dev, vpd->cap + PCI_VPD_DATA, &val);
+		if (ret < 0)
+			break;
+
+		skip = pos & 3;
+		for (i = 0;  i < sizeof(u32); i++) {
+			if (i >= skip) {
+				*buf++ = val;
+				if (++pos == end)
+					break;
+			}
+			val >>= 8;
+		}
+	}
 out:
 	mutex_unlock(&vpd->lock);
-	if (ret < 0)
-		return ret;
-
-	/* Convert to bytes */
-	begin = pos & 3;
-	end = min(4, begin + size);
-	for (i = 0; i < end; ++i) {
-		if (i >= begin)
-			*buf++ = val;
-		val >>= 8;
-	}
-	return end - begin;
+	return ret ? ret : count;
 }
 
-static int pci_vpd_pci22_write(struct pci_dev *dev, int pos, int size,
-			       const char *buf)
+static ssize_t pci_vpd_pci22_write(struct pci_dev *dev, loff_t pos, size_t count,
+				   const void *arg)
 {
 	struct pci_vpd_pci22 *vpd =
 		container_of(dev->vpd, struct pci_vpd_pci22, base);
-	u32 val;
+	const u8 *buf = arg;
+	loff_t end = pos + count;
 	int ret = 0;
 
-	if (pos < 0 || pos > vpd->base.len || pos & 3 ||
-	    size > vpd->base.len - pos || size < 4)
+	if (pos < 0 || (pos & 3) || (count & 3) || end > vpd->base.len)
 		return -EINVAL;
 
-	val = (u8) *buf++;
-	val |= ((u8) *buf++) << 8;
-	val |= ((u8) *buf++) << 16;
-	val |= ((u32)(u8) *buf++) << 24;
-
 	if (mutex_lock_killable(&vpd->lock))
 		return -EINTR;
+
 	ret = pci_vpd_pci22_wait(dev);
 	if (ret < 0)
 		goto out;
-	ret = pci_user_write_config_dword(dev, vpd->cap + PCI_VPD_DATA,
-					  val);
-	if (ret < 0)
-		goto out;
-	ret = pci_user_write_config_word(dev, vpd->cap + PCI_VPD_ADDR,
-					 pos | PCI_VPD_ADDR_F);
-	if (ret < 0)
-		goto out;
-	vpd->busy = true;
-	vpd->flag = 0;
-	ret = pci_vpd_pci22_wait(dev);
+
+	while (pos < end) {
+		u32 val;
+
+		val = *buf++;
+		val |= *buf++ << 8;
+		val |= *buf++ << 16;
+		val |= *buf++ << 24;
+
+		ret = pci_user_write_config_dword(dev, vpd->cap + PCI_VPD_DATA, val);
+		if (ret < 0)
+			break;
+		ret = pci_user_write_config_word(dev, vpd->cap + PCI_VPD_ADDR,
+						 pos | PCI_VPD_ADDR_F);
+		if (ret < 0)
+			break;
+
+		vpd->busy = true;
+		vpd->flag = 0;
+		ret = pci_vpd_pci22_wait(dev);
+
+		pos += sizeof(u32);
+	}
 out:
 	mutex_unlock(&vpd->lock);
-	if (ret < 0)
-		return ret;
-
-	return 4;
+	return ret ? ret : count;
 }
 
 static void pci_vpd_pci22_release(struct pci_dev *dev)
@@ -270,7 +312,7 @@ static void pci_vpd_pci22_release(struct
 	kfree(container_of(dev->vpd, struct pci_vpd_pci22, base));
 }
 
-static struct pci_vpd_ops pci_vpd_pci22_ops = {
+static const struct pci_vpd_ops pci_vpd_pci22_ops = {
 	.read = pci_vpd_pci22_read,
 	.write = pci_vpd_pci22_write,
 	.release = pci_vpd_pci22_release,
--- a/drivers/pci/pci.h	2008-10-25 08:52:24.000000000 -0700
+++ b/drivers/pci/pci.h	2008-10-25 09:01:54.000000000 -0700
@@ -50,14 +50,14 @@ extern int pci_user_write_config_word(st
 extern int pci_user_write_config_dword(struct pci_dev *dev, int where, u32 val);
 
 struct pci_vpd_ops {
-	int (*read)(struct pci_dev *dev, int pos, int size, char *buf);
-	int (*write)(struct pci_dev *dev, int pos, int size, const char *buf);
+	ssize_t (*read)(struct pci_dev *dev, loff_t pos, size_t count, void *buf);
+	ssize_t (*write)(struct pci_dev *dev, loff_t pos, size_t count, const void *buf);
 	void (*release)(struct pci_dev *dev);
 };
 
 struct pci_vpd {
 	unsigned int len;
-	struct pci_vpd_ops *ops;
+	const struct pci_vpd_ops *ops;
 	struct bin_attribute *attr; /* descriptor for sysfs VPD entry */
 };
 
--- a/drivers/pci/pci-sysfs.c	2008-10-25 08:52:24.000000000 -0700
+++ b/drivers/pci/pci-sysfs.c	2008-10-25 09:03:07.000000000 -0700
@@ -361,55 +361,33 @@ pci_write_config(struct kobject *kobj, s
 }
 
 static ssize_t
-pci_read_vpd(struct kobject *kobj, struct bin_attribute *bin_attr,
-	     char *buf, loff_t off, size_t count)
+read_vpd_attr(struct kobject *kobj, struct bin_attribute *bin_attr,
+	      char *buf, loff_t off, size_t count)
 {
 	struct pci_dev *dev =
 		to_pci_dev(container_of(kobj, struct device, kobj));
-	int end;
-	int ret;
 
 	if (off > bin_attr->size)
 		count = 0;
 	else if (count > bin_attr->size - off)
 		count = bin_attr->size - off;
-	end = off + count;
 
-	while (off < end) {
-		ret = dev->vpd->ops->read(dev, off, end - off, buf);
-		if (ret < 0)
-			return ret;
-		buf += ret;
-		off += ret;
-	}
-
-	return count;
+	return pci_read_vpd(dev, off, count, buf);
 }
 
 static ssize_t
-pci_write_vpd(struct kobject *kobj, struct bin_attribute *bin_attr,
-	      char *buf, loff_t off, size_t count)
+write_vpd_attr(struct kobject *kobj, struct bin_attribute *bin_attr,
+	       char *buf, loff_t off, size_t count)
 {
 	struct pci_dev *dev =
 		to_pci_dev(container_of(kobj, struct device, kobj));
-	int end;
-	int ret;
 
 	if (off > bin_attr->size)
 		count = 0;
 	else if (count > bin_attr->size - off)
 		count = bin_attr->size - off;
-	end = off + count;
-
-	while (off < end) {
-		ret = dev->vpd->ops->write(dev, off, end - off, buf);
-		if (ret < 0)
-			return ret;
-		buf += ret;
-		off += ret;
-	}
 
-	return count;
+	return pci_write_vpd(dev, off, count, buf);
 }
 
 #ifdef HAVE_PCI_LEGACY
@@ -832,8 +810,8 @@ static int pci_create_capabilities_sysfs
 		attr->size = dev->vpd->len;
 		attr->attr.name = "vpd";
 		attr->attr.mode = S_IRUSR | S_IWUSR;
-		attr->read = pci_read_vpd;
-		attr->write = pci_write_vpd;
+		attr->read = read_vpd_attr;
+		attr->write = write_vpd_attr;
 		retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
 		if (retval) {
 			kfree(dev->vpd->attr);
--- a/include/linux/pci.h	2008-10-25 08:52:29.000000000 -0700
+++ b/include/linux/pci.h	2008-10-25 09:04:43.000000000 -0700
@@ -669,6 +669,10 @@ int pci_back_from_sleep(struct pci_dev *
 /* Functions for PCI Hotplug drivers to use */
 int pci_bus_find_capability(struct pci_bus *bus, unsigned int devfn, int cap);
 
+/* Vital product data routines */
+ssize_t pci_read_vpd(struct pci_dev *dev, loff_t pos, size_t count, void *buf);
+ssize_t pci_write_vpd(struct pci_dev *dev, loff_t pos, size_t count, const void *buf);
+
 /* Helper functions for low-level code (drivers/pci/setup-[bus,res].c) */
 void pci_bus_assign_resources(struct pci_bus *bus);
 void pci_bus_size_bridges(struct pci_bus *bus);

-- 

[PATCH 3/8] PCI: add interface to set visible size of VPD (rev3)

[Stephen Hemminger]

[-- Attachment #1: vpd-size.patch --]
[-- Type: text/plain, Size: 1677 bytes --]

The VPD on all devices may not be 32K. Unfortunately, there is no
generic way to find the size, so this adds a simple API hook
to reset it.

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

---
 drivers/pci/access.c |   23 +++++++++++++++++++++++
 include/linux/pci.h  |    1 +
 2 files changed, 24 insertions(+)

--- a/drivers/pci/access.c	2008-10-25 09:01:54.000000000 -0700
+++ b/drivers/pci/access.c	2008-10-25 09:03:27.000000000 -0700
@@ -340,6 +340,29 @@ int pci_vpd_pci22_init(struct pci_dev *d
 }
 
 /**
+ * pci_vpd_truncate - Set available Vital Product Data size
+ * @dev:	pci device struct
+ * @size:	available memory in bytes
+ *
+ * Adjust size of available VPD area.
+ */
+int pci_vpd_truncate(struct pci_dev *dev, size_t size)
+{
+	if (!dev->vpd)
+		return -EINVAL;
+
+	/* limited by the access method */
+	if (size > dev->vpd->len)
+		return -EINVAL;
+
+	dev->vpd->len = size;
+	dev->vpd->attr->size = size;
+
+	return 0;
+}
+EXPORT_SYMBOL(pci_vpd_truncate);
+
+/**
  * pci_block_user_cfg_access - Block userspace PCI config reads/writes
  * @dev:	pci device struct
  *
--- a/include/linux/pci.h	2008-10-25 09:01:54.000000000 -0700
+++ b/include/linux/pci.h	2008-10-25 09:03:27.000000000 -0700
@@ -672,6 +672,7 @@ int pci_bus_find_capability(struct pci_b
 /* Vital product data routines */
 ssize_t pci_read_vpd(struct pci_dev *dev, loff_t pos, size_t count, void *buf);
 ssize_t pci_write_vpd(struct pci_dev *dev, loff_t pos, size_t count, const void *buf);
+int pci_vpd_truncate(struct pci_dev *dev, size_t size);
 
 /* Helper functions for low-level code (drivers/pci/setup-[bus,res].c) */
 void pci_bus_assign_resources(struct pci_bus *bus);

-- 

[PATCH 4/8] 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	2008-11-21 12:14:49.000000000 -0800
+++ b/drivers/net/sky2.c	2008-11-24 08:48:00.000000000 -0800
@@ -3864,6 +3864,86 @@ 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;
@@ -3873,14 +3953,18 @@ 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);
 
@@ -4204,69 +4288,6 @@ 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)
 {
@@ -4370,8 +4391,6 @@ 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 5/8] 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	2008-11-24 08:48:00.000000000 -0800
+++ b/drivers/net/sky2.c	2008-11-24 08:48:18.000000000 -0800
@@ -4315,6 +4315,7 @@ 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);
@@ -4348,6 +4349,34 @@ 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;
@@ -4365,18 +4394,6 @@ 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)

-- 

[PATCH 6/8] skge: add VPD display into debug interface

[Stephen Hemminger]

[-- Attachment #1: skge-vpd-debug.patch --]
[-- Type: text/plain, Size: 2844 bytes --]

The VPD stuff has more data and useful only when debugging.

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

--- a/drivers/net/skge.c	2008-11-21 12:14:49.000000000 -0800
+++ b/drivers/net/skge.c	2008-11-24 08:50:54.000000000 -0800
@@ -3668,19 +3668,102 @@ static int skge_reset(struct skge_hw *hw
 
 static struct dentry *skge_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 skge_show_vpd(struct seq_file *seq, struct skge_hw *hw)
+{
+	size_t vpd_size;
+	loff_t offs;
+	u8 len;
+	unsigned char *buf;
+	u32 reg2;
+
+	pci_read_config_dword(hw->pdev, PCI_DEV_REG2, &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 skge_debug_show(struct seq_file *seq, void *v)
 {
 	struct net_device *dev = seq->private;
 	const struct skge_port *skge = netdev_priv(dev);
-	const struct skge_hw *hw = skge->hw;
+	struct skge_hw *hw = skge->hw;
 	const struct skge_element *e;
 
-	if (!netif_running(dev))
-		return -ENETDOWN;
+	skge_show_vpd(seq, hw);
 
 	seq_printf(seq, "IRQ src=%x mask=%x\n", skge_read32(hw, B0_ISRC),
 		   skge_read32(hw, B0_IMSK));
 
+	if (!netif_running(dev)) {
+		seq_printf(seq, "network not running\n");
+		return 0;
+	}
+
 	seq_printf(seq, "Tx Ring: (%d)\n", skge_avail(&skge->tx_ring));
 	for (e = skge->tx_ring.to_clean; e != skge->tx_ring.to_use; e = e->next) {
 		const struct skge_tx_desc *t = e->desc;

-- 

[PATCH 7/8] skge: set VPD size

[Stephen Hemminger]

[-- Attachment #1: skge-vpd-size.patch --]
[-- Type: text/plain, Size: 1130 bytes --]

Read configuration register during probe and use it to size the
available VPD.

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

--- a/drivers/net/skge.c	2008-11-24 08:50:54.000000000 -0800
+++ b/drivers/net/skge.c	2008-11-24 08:50:58.000000000 -0800
@@ -3980,6 +3980,7 @@ static int __devinit skge_probe(struct p
 	struct net_device *dev, *dev1;
 	struct skge_hw *hw;
 	int err, using_dac = 0;
+	u32 reg;
 
 	err = pci_enable_device(pdev);
 	if (err) {
@@ -4008,15 +4009,17 @@ static int __devinit skge_probe(struct p
 		goto err_out_free_regions;
 	}
 
+	pci_read_config_dword(pdev, PCI_DEV_REG2, &reg);
+
+	/* set size of available VPD, only impacts 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
 	/* byte swap descriptors in hardware */
-	{
-		u32 reg;
-
-		pci_read_config_dword(pdev, PCI_DEV_REG2, &reg);
-		reg |= PCI_REV_DESC;
-		pci_write_config_dword(pdev, PCI_DEV_REG2, reg);
-	}
+	reg |= PCI_REV_DESC;
+	pci_write_config_dword(pdev, PCI_DEV_REG2, reg);
 #endif
 
 	err = -ENOMEM;

-- 

[PATCH 8/8] sky2: handle dma mapping errors

[Stephen Hemminger]

[-- Attachment #1: sky2-dma-error.patch --]
[-- Type: text/plain, Size: 4098 bytes --]

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

Compile and walkthrough only, don't have any non-x86 hardware to 
actually test this on.

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

--- a/drivers/net/sky2.c	2008-12-09 09:16:48.557334377 -0800
+++ b/drivers/net/sky2.c	2008-12-09 10:08:37.206334330 -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);

-- 

Re: [PATCH 0/8] skge/sky2 patches for net-next

[David Miller]

From: Stephen Hemminger <shemminger@vyatta.com>
Date: Wed, 17 Dec 2008 16:01:44 -0800

> 1-7 have been reviewed several times but not accepted??
> Last one is new.

Stephen, I can't apply the PCI layer changes to the networking tree.

And only the first one even has a review by a PCI hacker.

To top it off, linux-pci and linux-kernel were not even CC'd for a set
of changes that span multiple subsystems.

What do you expect me to do? :-/

I really can't do anything with this patch set as it stands, so they
will all stay not-applied once more.  Please get this work integrated
properly.  First get the PCI changes into the PCI maintainer's tree,
then we can figure out a way to deal with the dependency to get the
sky2 changes into the net-next-2.6 tree.