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Date: Wed, 06 Dec 2023 23:16:10 +0000
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Message-ID: <20231206-ethtool_puts_impl-v5-1-5a2528e17bf8@google.com>
Subject: [PATCH net-next v5 1/3] ethtool: Implement ethtool_puts()
From: justinstitt@google.com
To: "David S. Miller" <davem@davemloft.net>, Eric Dumazet <edumazet@google.com>, 
	Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>, Shay Agroskin <shayagr@amazon.com>, 
	Arthur Kiyanovski <akiyano@amazon.com>, David Arinzon <darinzon@amazon.com>, Noam Dagan <ndagan@amazon.com>, 
	Saeed Bishara <saeedb@amazon.com>, Rasesh Mody <rmody@marvell.com>, 
	Sudarsana Kalluru <skalluru@marvell.com>, GR-Linux-NIC-Dev@marvell.com, 
	Dimitris Michailidis <dmichail@fungible.com>, Yisen Zhuang <yisen.zhuang@huawei.com>, 
	Salil Mehta <salil.mehta@huawei.com>, Jesse Brandeburg <jesse.brandeburg@intel.com>, 
	Tony Nguyen <anthony.l.nguyen@intel.com>, Louis Peens <louis.peens@corigine.com>, 
	Shannon Nelson <shannon.nelson@amd.com>, Brett Creeley <brett.creeley@amd.com>, drivers@pensando.io, 
	"K. Y. Srinivasan" <kys@microsoft.com>, Haiyang Zhang <haiyangz@microsoft.com>, Wei Liu <wei.liu@kernel.org>, 
	Dexuan Cui <decui@microsoft.com>, Ronak Doshi <doshir@vmware.com>, 
	VMware PV-Drivers Reviewers <pv-drivers@vmware.com>, Andy Whitcroft <apw@canonical.com>, Joe Perches <joe@perches.com>, 
	Dwaipayan Ray <dwaipayanray1@gmail.com>, Lukas Bulwahn <lukas.bulwahn@gmail.com>, 
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	Florian Fainelli <f.fainelli@gmail.com>, Vladimir Oltean <olteanv@gmail.com>, 
	"=?utf-8?q?Ar=C4=B1n=C3=A7_=C3=9CNAL?=" <arinc.unal@arinc9.com>, Daniel Golle <daniel@makrotopia.org>, 
	Landen Chao <Landen.Chao@mediatek.com>, DENG Qingfang <dqfext@gmail.com>, 
	Sean Wang <sean.wang@mediatek.com>, Matthias Brugger <matthias.bgg@gmail.com>, 
	AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>, 
	Linus Walleij <linus.walleij@linaro.org>, 
	"=?utf-8?q?Alvin_=C5=A0ipraga?=" <alsi@bang-olufsen.dk>, Wei Fang <wei.fang@nxp.com>, 
	Shenwei Wang <shenwei.wang@nxp.com>, Clark Wang <xiaoning.wang@nxp.com>, 
	NXP Linux Team <linux-imx@nxp.com>, Lars Povlsen <lars.povlsen@microchip.com>, 
	Steen Hegelund <Steen.Hegelund@microchip.com>, Daniel Machon <daniel.machon@microchip.com>, 
	UNGLinuxDriver@microchip.com, Jiawen Wu <jiawenwu@trustnetic.com>, 
	Mengyuan Lou <mengyuanlou@net-swift.com>, Heiner Kallweit <hkallweit1@gmail.com>, 
	Russell King <linux@armlinux.org.uk>, Alexei Starovoitov <ast@kernel.org>, 
	Daniel Borkmann <daniel@iogearbox.net>, Jesper Dangaard Brouer <hawk@kernel.org>, 
	John Fastabend <john.fastabend@gmail.com>
Cc: linux-kernel@vger.kernel.org, netdev@vger.kernel.org, 
	Nick Desaulniers <ndesaulniers@google.com>, Nathan Chancellor <nathan@kernel.org>, 
	Kees Cook <keescook@chromium.org>, intel-wired-lan@lists.osuosl.org, 
	oss-drivers@corigine.com, linux-hyperv@vger.kernel.org, 
	linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, 
	bpf@vger.kernel.org, Justin Stitt <justinstitt@google.com>
Content-Type: text/plain; charset="utf-8"

Use strscpy() to implement ethtool_puts().

Functionally the same as ethtool_sprintf() when it's used with two
arguments or with just "%s" format specifier.

Signed-off-by: Justin Stitt <justinstitt@google.com>
---
 include/linux/ethtool.h | 13 +++++++++++++
 net/ethtool/ioctl.c     |  7 +++++++
 2 files changed, 20 insertions(+)

--- a/include/linux/ethtool.h
+++ b/include/linux/ethtool.h
@@ -788,4 +788,17 @@ int ethtool_get_phc_vclocks(struct net_d
  * next string.
  */
 extern __printf(2, 3) void ethtool_sprintf(u8 **data, const char *fmt, ...);
+
+/**
+ * ethtool_puts - Write string to ethtool string data
+ * @data: Pointer to a pointer to the start of string to update
+ * @str: String to write
+ *
+ * Write string to *data without a trailing newline. Update *data
+ * to point at start of next string.
+ *
+ * Prefer this function to ethtool_sprintf() when given only
+ * two arguments or if @fmt is just "%s".
+ */
+extern void ethtool_puts(u8 **data, const char *str);
 #endif /* _LINUX_ETHTOOL_H */
--- a/net/ethtool/ioctl.c
+++ b/net/ethtool/ioctl.c
@@ -1957,6 +1957,13 @@ __printf(2, 3) void ethtool_sprintf(u8 *
 }
 EXPORT_SYMBOL(ethtool_sprintf);
 
+void ethtool_puts(u8 **data, const char *str)
+{
+	strscpy(*data, str, ETH_GSTRING_LEN);
+	*data += ETH_GSTRING_LEN;
+}
+EXPORT_SYMBOL(ethtool_puts);
+
 static int ethtool_phys_id(struct net_device *dev, void __user *useraddr)
 {
 	struct ethtool_value id;
