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[net-next,v2,01/10] ethtool: Add common function for filling out strings

Message ID 161594103620.5644.13159023537924919629.stgit@localhost.localdomain (mailing list archive)
State Accepted
Commit 7888fe53b7066c284e172d98d98d1865d6a9e5a0
Delegated to: Netdev Maintainers
Headers show
Series ethtool: Factor out common code related to writing ethtool strings | expand

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netdev/cc_maintainers warning 10 maintainers not CCed: ecree@solarflare.com andrew@lunn.ch amitc@mellanox.com gustavo@embeddedor.com magnus.karlsson@intel.com acardace@redhat.com f.fainelli@gmail.com danieller@nvidia.com mkubecek@suse.cz irusskikh@marvell.com
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netdev/build_32bit success Errors and warnings before: 3080 this patch: 3080
netdev/kdoc success Errors and warnings before: 14 this patch: 14
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netdev/build_allmodconfig_warn success Errors and warnings before: 3198 this patch: 3198
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Commit Message

Alexander Duyck March 17, 2021, 12:30 a.m. UTC 
From: Alexander Duyck <alexanderduyck@fb.com>

Add a function to handle the common pattern of printing a string into the
ethtool strings interface and incrementing the string pointer by the
ETH_GSTRING_LEN. Most of the drivers end up doing this and several have
implemented their own versions of this function so it would make sense to
consolidate on one implementation.

Signed-off-by: Alexander Duyck <alexanderduyck@fb.com>
---
 include/linux/ethtool.h |    9 +++++++++
 net/ethtool/ioctl.c     |   12 ++++++++++++
 2 files changed, 21 insertions(+)
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Patch

diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
index ec4cd3921c67..3583f7fc075c 100644
--- a/include/linux/ethtool.h
+++ b/include/linux/ethtool.h
@@ -571,4 +571,13 @@  struct ethtool_phy_ops {
  */
 void ethtool_set_ethtool_phy_ops(const struct ethtool_phy_ops *ops);
 
+/**
+ * ethtool_sprintf - Write formatted string to ethtool string data
+ * @data: Pointer to start of string to update
+ * @fmt: Format of string to write
+ *
+ * Write formatted string to data. Update data to point at start of
+ * next string.
+ */
+extern __printf(2, 3) void ethtool_sprintf(u8 **data, const char *fmt, ...);
 #endif /* _LINUX_ETHTOOL_H */
diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c
index 24783b71c584..0788cc3b3114 100644
--- a/net/ethtool/ioctl.c
+++ b/net/ethtool/ioctl.c
@@ -1844,6 +1844,18 @@  static int ethtool_get_strings(struct net_device *dev, void __user *useraddr)
 	return ret;
 }
 
+__printf(2, 3) void ethtool_sprintf(u8 **data, const char *fmt, ...)
+{
+	va_list args;
+
+	va_start(args, fmt);
+	vsnprintf(*data, ETH_GSTRING_LEN, fmt, args);
+	va_end(args);
+
+	*data += ETH_GSTRING_LEN;
+}
+EXPORT_SYMBOL(ethtool_sprintf);
+
 static int ethtool_phys_id(struct net_device *dev, void __user *useraddr)
 {
 	struct ethtool_value id;