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Date: Sun, 23 Dec 2007 16:20:35 -0800
From: "Michael Chan" <mchan@...adcom.com>
To: "Joe Perches" <joe@...ches.com>
cc: "David Miller" <davem@...emloft.net>,
"netdev" <netdev@...r.kernel.org>, anilgv@...adcom.com,
michaelc@...wisc.edu, david.somayajulu@...gic.com
Subject: Re: [ETH]: Combine format_addr() with print_mac().
On Fri, 2007-12-21 at 23:02 -0800, Joe Perches wrote:
> On Fri, 2007-12-21 at 19:58 -0800, Michael Chan wrote:
> > > ssize_t? shouldn't it be size_t?
> > I'm just keeping the prototype unchanged as originally defined in net-
> > sysfs.c
>
> It's painless to change the prototype.
> size_t seems more sensible.
>
I'll change the internal function to use size_t, but the exported
function for sysfs use will be ssize_t since sysfs uses ssize_t.
Here's the revised patch:
[ETH]: Combine format_addr() with print_mac().
print_mac() used many most net drivers and format_addr() used by
net-sysfs.c are very similar and they can be intergrated.
format_addr() is also identically redefined in the qla4xxx iscsi
driver.
Export a new function sysfs_format_mac() to be used by net-sysfs,
qla4xxx and others in the future. Both print_mac() and
sysfs_format_mac() call _format_mac_addr() to do the formatting.
Changed print_mac() to use unsigned char * to be consistent with
net_device struct's dev_addr. Added buffer length overrun checking
as suggested by Joe Perches.
Signed-off-by: Michael Chan <mchan@...adcom.com>
Cc: Joe Perches <joe@...ches.com>
Cc: Mike Christie <michaelc@...wisc.edu>
Cc: David Somayajulu <david.somayajulu@...gic.com>
diff --git a/drivers/scsi/qla4xxx/ql4_os.c b/drivers/scsi/qla4xxx/ql4_os.c
index 89460d2..4e9cf18 100644
--- a/drivers/scsi/qla4xxx/ql4_os.c
+++ b/drivers/scsi/qla4xxx/ql4_os.c
@@ -173,18 +173,6 @@ static void qla4xxx_conn_stop(struct iscsi_cls_conn *conn, int flag)
printk(KERN_ERR "iscsi: invalid stop flag %d\n", flag);
}
-static ssize_t format_addr(char *buf, const unsigned char *addr, int len)
-{
- int i;
- char *cp = buf;
-
- for (i = 0; i < len; i++)
- cp += sprintf(cp, "%02x%c", addr[i],
- i == (len - 1) ? '\n' : ':');
- return cp - buf;
-}
-
-
static int qla4xxx_host_get_param(struct Scsi_Host *shost,
enum iscsi_host_param param, char *buf)
{
@@ -193,7 +181,7 @@ static int qla4xxx_host_get_param(struct Scsi_Host *shost,
switch (param) {
case ISCSI_HOST_PARAM_HWADDRESS:
- len = format_addr(buf, ha->my_mac, MAC_ADDR_LEN);
+ len = sysfs_format_mac(buf, ha->my_mac, MAC_ADDR_LEN);
break;
case ISCSI_HOST_PARAM_IPADDRESS:
len = sprintf(buf, "%d.%d.%d.%d\n", ha->ip_address[0],
diff --git a/include/linux/if_ether.h b/include/linux/if_ether.h
index cc002cb..7a1e011 100644
--- a/include/linux/if_ether.h
+++ b/include/linux/if_ether.h
@@ -124,12 +124,14 @@ int eth_header_parse(const struct sk_buff *skb, unsigned char *haddr);
extern struct ctl_table ether_table[];
#endif
+extern ssize_t sysfs_format_mac(char *buf, const unsigned char *addr, int len);
+
/*
* Display a 6 byte device address (MAC) in a readable format.
*/
-#define MAC_FMT "%02x:%02x:%02x:%02x:%02x:%02x"
-extern char *print_mac(char *buf, const u8 *addr);
-#define DECLARE_MAC_BUF(var) char var[18] __maybe_unused
+extern char *print_mac(char *buf, const unsigned char *addr);
+#define MAC_BUF_SIZE 18
+#define DECLARE_MAC_BUF(var) char var[MAC_BUF_SIZE] __maybe_unused
#endif
diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index e41f4b9..7635d3f 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -95,17 +95,6 @@ NETDEVICE_SHOW(type, fmt_dec);
NETDEVICE_SHOW(link_mode, fmt_dec);
/* use same locking rules as GIFHWADDR ioctl's */
-static ssize_t format_addr(char *buf, const unsigned char *addr, int len)
-{
- int i;
- char *cp = buf;
-
- for (i = 0; i < len; i++)
- cp += sprintf(cp, "%02x%c", addr[i],
- i == (len - 1) ? '\n' : ':');
- return cp - buf;
-}
-
static ssize_t show_address(struct device *dev, struct device_attribute *attr,
char *buf)
{
@@ -114,7 +103,7 @@ static ssize_t show_address(struct device *dev, struct device_attribute *attr,
read_lock(&dev_base_lock);
if (dev_isalive(net))
- ret = format_addr(buf, net->dev_addr, net->addr_len);
+ ret = sysfs_format_mac(buf, net->dev_addr, net->addr_len);
read_unlock(&dev_base_lock);
return ret;
}
@@ -124,7 +113,7 @@ static ssize_t show_broadcast(struct device *dev,
{
struct net_device *net = to_net_dev(dev);
if (dev_isalive(net))
- return format_addr(buf, net->broadcast, net->addr_len);
+ return sysfs_format_mac(buf, net->broadcast, net->addr_len);
return -EINVAL;
}
diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c
index 6b2e454..a7b4175 100644
--- a/net/ethernet/eth.c
+++ b/net/ethernet/eth.c
@@ -359,10 +359,34 @@ struct net_device *alloc_etherdev_mq(int sizeof_priv, unsigned int queue_count)
}
EXPORT_SYMBOL(alloc_etherdev_mq);
-char *print_mac(char *buf, const u8 *addr)
+static size_t _format_mac_addr(char *buf, int buflen,
+ const unsigned char *addr, int len)
{
- sprintf(buf, MAC_FMT,
- addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
+ int i;
+ char *cp = buf;
+
+ for (i = 0; i < len; i++) {
+ cp += scnprintf(cp, buflen - (cp - buf), "%02x", addr[i]);
+ if (i == len - 1)
+ break;
+ cp += strlcpy(cp, ":", buflen - (cp - buf));
+ }
+ return cp - buf;
+}
+
+ssize_t sysfs_format_mac(char *buf, const unsigned char *addr, int len)
+{
+ size_t l;
+
+ l = _format_mac_addr(buf, PAGE_SIZE, addr, len);
+ l += strlcpy(buf + l, "\n", PAGE_SIZE - l);
+ return ((ssize_t) l);
+}
+EXPORT_SYMBOL(sysfs_format_mac);
+
+char *print_mac(char *buf, const unsigned char *addr)
+{
+ _format_mac_addr(buf, MAC_BUF_SIZE, addr, ETH_ALEN);
return buf;
}
EXPORT_SYMBOL(print_mac);
--
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