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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Andrew Lunn , David Ahern Cc: linux-kernel@vger.kernel.org, netdev@vger.kernel.org, Breno Leitao , kuniyu@amazon.co.jp, ushankar@purestorage.com, kernel-team@meta.com, Kuniyuki Iwashima X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=1189; i=leitao@debian.org; h=from:subject:message-id; bh=TeA4rNuL5OilOfZvcur4gi/G5KqrL8dSVvG7Yj3C6lo=; b=owEBbQKS/ZANAwAIATWjk5/8eHdtAcsmYgBnrN64uIDIAhvtuQXtaG22KtbAaQbnZ2sNS0y8W xA7EXf4sS6JAjMEAAEIAB0WIQSshTmm6PRnAspKQ5s1o5Of/Hh3bQUCZ6zeuAAKCRA1o5Of/Hh3 bVfDD/9r3XSIuSjHh5TI1VxCYT8uN8LZxD3WwQxKy5zUfnU45UmhS8EdTey0LWlMJy4/c3k3qGk aiZYPWGtAM3j8WA7B56kEqAzPHTtLsbGnnqe/ygPWe0fM4ZHmHd6x0+kjN7XkhTIl/43nS8U23+ uDWxpx7p3w+ZHuNgZ+iiElquV3ouba2u3Nn4KsW3qAOpTsVJZNbRQk5FaPMKOD18aA5qTq48a0c kxMt6RfD2eveMQdeeqYqHkp/QjHFk/kCfkO4tP3ABcz39QTk/j9WrRGolGnVeqy9V63Hv/jyT5m eT8iaDbd0ES7M1G4eXwC84re0krWbK0bcpNgb1DEMd5RT0kj3LWbNtnGlYEQqZI5m8uWYcPk9dS Nf2C/FeMg5+ZjJHAmgXjSlqoMIdhKHbfYy5WqQ0npnwapkTcvvvtCiKIwC2Pel7MGmAcqfWNoRZ baNqZQAyFAcHzSdo+YymTQZFLAs0NcTUmaWFqIhmzbkf8f9fhfsCN0V2Gy4DhWTV5YwQPRzvGvA MPhaGjCAqAFnDWS/RSkem7AnUsKcBIIBrPtQpn0F3IVnZ+pSjFy9WR4AQXJdsaSuPYpXPVa2ty1 RxFccu9iQ7XcYFkYEgwsmOwvqlRcXBC9B5un+Nw/Ku7z/utBlpWsOocQtMTtrJ/0NPcFpEOXVJ3 A3YuiZWbtPfCb1g== X-Developer-Key: i=leitao@debian.org; a=openpgp; fpr=AC8539A6E8F46702CA4A439B35A3939FFC78776D X-Patchwork-Delegate: kuba@kernel.org Add missing return value documentation in the kernel-doc comment for dev_getbyhwaddr_rcu(), clarifying that it returns either a pointer to net_device or NULL if no matching device is found. This fix a warning found in NIPA[1]: net/core/dev.c:1141: warning: No description found for return value of 'dev_getbyhwaddr_rcu' Link: https://netdev.bots.linux.dev/static/nipa/931564/13964899/kdoc/summary [1] Signed-off-by: Breno Leitao Reviewed-by: Kuniyuki Iwashima --- net/core/dev.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/core/dev.c b/net/core/dev.c index d5ab9a4b318ea4926c200ef20dae01eaafa18c6b..0b3480a125fcaa6f036ddf219c29fa362ea0cb29 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -1134,8 +1134,8 @@ int netdev_get_name(struct net *net, char *name, int ifindex) * The returned device has not had its ref count increased * and the caller must therefore be careful about locking * + * Return: pointer to the net_device, or NULL if not found */ - struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type, const char *ha) { From patchwork Wed Feb 12 17:47:25 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Breno Leitao X-Patchwork-Id: 13972267 X-Patchwork-Delegate: kuba@kernel.org Received: from mail-ed1-f52.google.com (mail-ed1-f52.google.com [209.85.208.52]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 505FE25D546; Wed, 12 Feb 2025 17:47:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.208.52 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739382466; cv=none; b=acXvUxn980N/oEuZLgpd2UzLIlio1ycQGQf9ZBnxdHXIUQCzh3OePfL4qBe0YwsO2Ehl73lz6JKfbOOvEhzZEyrq7aDqOa+hZfy0+h3OCpXZnBHVzfQXJ7jIINiyz8NYByDjNfCaeviwZL048Kjha8xwGJjNQNfpiGV92C/uvAQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739382466; c=relaxed/simple; bh=GfR6JTuRSsa2IYJJgEme7fW5A4V2org/1egMMxi3lEA=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=t9XFsIQpvaPoBiZ3mKATzDyTCHZPEEQX1uh2wr9I/Au8tm/YGuu/llw+fVUPw0In5u1AyXapATxFDdQO5psUfAJBZdqBNNF0kNA8h/kO7gNZLaJZvGSr9FFjUpIEEMYXRs+CLSpL3JwFbGVZulD/Epm7xjNHCMA6On+Hh0EXRC0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=debian.org; spf=pass smtp.mailfrom=gmail.com; arc=none smtp.client-ip=209.85.208.52 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=debian.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Received: by mail-ed1-f52.google.com with SMTP id 4fb4d7f45d1cf-5dec817f453so386645a12.2; Wed, 12 Feb 2025 09:47:42 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1739382461; x=1739987261; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=/DJqbUdrIBG93xhwXUYCen7csaum05otOobrUq2xeUA=; b=chwnPa3++rOmRJcPid+GmmTCfPjynNae/o3nCw1wlpCJaPJRwsNjyyHwaMUikflwvs M129vMvLf1Au62H+7KO6wury6Bb4LkB6/wa+an7QOXHZdbIZrVX8UFuDrFRlPkxaFZ8T 4h+zZCIRob8xpwSo2vt0b0P8/5sd1+zQgp7YNNYk9ZPLn0J/M3r/i7oCU9Vt6RsGRL41 InxTolq2tG9rjqPMEG8JydqYyI6NeiVJbe/xLulh8qGXqVmwcQ18L2yoNNTNW3bcSQha XciouAtzp3kHmJCPF8lW9MFc+QlvHmgmWTWb6OJCqaTp3dPwXL9LChCro0GgFJkZbs7u segA== X-Forwarded-Encrypted: i=1; AJvYcCUtmz7EEqAwxaLm3zKm7PBln+Ttpin/4rFZtIiHjj7NKc/c3XzC9kij8oBAYUOIrpnFy7jEsfk=@vger.kernel.org X-Gm-Message-State: AOJu0YwhBNtMX8LLmv3KHkc4kqPbrmeSyHC0/FUN+smP8NJ+zYMI7cGZ vrkahb0bI8Hj+43p367f4ygklmk82flViLLOGgaA+kRbRjobB5/7 X-Gm-Gg: ASbGncsrgMdrrDWk/X+J1qu6lHjxM69H/0Lmg45k4jSYC4FadaWr6ZlGbVEQI48pNTE JWK4tpzrMbjiXtjVYebYT8IekscNjAmzS0JDztcHjSe0SHkRRridynZh2Gl4q3RciNvCAsZzEnT zrIAlOkWgBzaYzaBUtztySGRSGJXuUYZRdQu9R8yu8hQSzmVyPA9vsAYye5enqFHxyTcWzzI8zx w1IE1CbxuFOi+OTDtW7uEQhds7riiZ+A5Ycf7CjPaeSqhdekKG74EirlUtBe4azpT6outE8c2Q7 5CZq2w== X-Google-Smtp-Source: AGHT+IEM9cL9mfPZWC6PdtyKbpT+cMyOcYAdAhPmC6gbjZ8NAdy8ccqiWYRnMBUvMk8+BZS3Mk7r3g== X-Received: by 2002:a05:6402:5114:b0:5da:ba6:3a3e with SMTP id 4fb4d7f45d1cf-5deadd780e6mr3859145a12.7.1739382461304; Wed, 12 Feb 2025 09:47:41 -0800 (PST) Received: from localhost ([2a03:2880:30ff:4::]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-5dcf1b73f8csm11671510a12.8.2025.02.12.09.47.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 12 Feb 2025 09:47:40 -0800 (PST) From: Breno Leitao Date: Wed, 12 Feb 2025 09:47:25 -0800 Subject: [PATCH net-next v3 2/3] net: Add dev_getbyhwaddr_rtnl() helper Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20250212-arm_fix_selftest-v3-2-72596cb77e44@debian.org> References: <20250212-arm_fix_selftest-v3-0-72596cb77e44@debian.org> In-Reply-To: <20250212-arm_fix_selftest-v3-0-72596cb77e44@debian.org> To: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Andrew Lunn , David Ahern Cc: linux-kernel@vger.kernel.org, netdev@vger.kernel.org, Breno Leitao , kuniyu@amazon.co.jp, ushankar@purestorage.com, kernel-team@meta.com, kuniyu@amazon.com X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=3573; i=leitao@debian.org; h=from:subject:message-id; bh=GfR6JTuRSsa2IYJJgEme7fW5A4V2org/1egMMxi3lEA=; b=owEBbQKS/ZANAwAIATWjk5/8eHdtAcsmYgBnrN648rReug6hS5mIJNHOHbNvHBy1Z/vJmSmUh hXywQZTWyiJAjMEAAEIAB0WIQSshTmm6PRnAspKQ5s1o5Of/Hh3bQUCZ6zeuAAKCRA1o5Of/Hh3 bQwzD/9nOcuExTATmY0VnbrnOgXqaQxRNcbgDi2TclRrBnwWixFCyUdugTYjv/+NBPCzc0s77UF A7msvkPPDzUzddCL0ZQMm2MX/MkEDIx/TKASeHR5nrXPpPrQPRwEqGtbzD3+/Jp98UT831pz4x6 DRCrR/CuL7TvLcoGLGNcuBIxsh26EB/wAxp6nmcpL5uqGUmckAw+qs3PZyICxWA19XmComvtPM/ qm52Jt6kjjREPKs/4QdxfDmpU5aonu+0tcPQLS3+0uFgCCVBayuE/G2bwVidfy0CUKr1M4Z41Rv ouBVcf2sTf9lszRr+jVXwW74h3LiAs4rOvt/kq3ils3tZJbxRVTEYE/QW9UT+wR9Cpis0TF4Euw fy+/F+CSUb1G1IJGUQO1Dvh3zelvKTF1vxmK36g8zk+MKT3LjQwl8pIJrPXVf6BRxDe6vdoJtCX LEd8YJGgFQXbrdBjQqWID0vT/6ciWAUVQok/E66RXuLvG+cnSxFGMxoYbQL3ERMnIUh7yVF5HAP zCJ+i+dnOjJzJXMKt2CEZhMs5b0rWMOJWNOkxnOLMj7CG7TjOTXVMd+d2eijxc/4wIky5OQBhFA npFip61RR1Gd6KpR01OU9crzXcnUjsQWMhOk6Ncs2HC4t/lB1M34M0P+0Ryv6g2c5ug7Olot+zM XRy8kc7jJRisAew== X-Developer-Key: i=leitao@debian.org; a=openpgp; fpr=AC8539A6E8F46702CA4A439B35A3939FFC78776D X-Patchwork-Delegate: kuba@kernel.org Add dedicated helper for finding devices by hardware address when holding rtnl_lock, similar to existing dev_getbyhwaddr_rcu(). This prevents PROVE_LOCKING warnings when rtnl_lock is held but RCU read lock is not. Extract common address comparison logic into dev_comp_addr(). The context about this change could be found in the following discussion: Link: https://lore.kernel.org/all/20250206-scarlet-ermine-of-improvement-1fcac5@leitao/ Cc: kuniyu@amazon.com Cc: ushankar@purestorage.com Suggested-by: Eric Dumazet Signed-off-by: Breno Leitao --- include/linux/netdevice.h | 2 ++ net/core/dev.c | 36 +++++++++++++++++++++++++++++++++--- 2 files changed, 35 insertions(+), 3 deletions(-) diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 5429581f22995bff639e6962a317adbd0ce30cff..641091c73710f8c4229e76c66f40ede9c235c221 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -3270,6 +3270,8 @@ static inline struct net_device *first_net_device_rcu(struct net *net) } int netdev_boot_setup_check(struct net_device *dev); +struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, + const char *hwaddr); struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type, const char *hwaddr); struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type); diff --git a/net/core/dev.c b/net/core/dev.c index 0b3480a125fcaa6f036ddf219c29fa362ea0cb29..fd15f96cbd8a99da0aa686f22e3e955d179ffc99 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -1122,6 +1122,12 @@ int netdev_get_name(struct net *net, char *name, int ifindex) return ret; } +static bool dev_comp_addr(struct net_device *dev, unsigned short type, + const char *ha) +{ + return dev->type == type && !memcmp(dev->dev_addr, ha, dev->addr_len); +} + /** * dev_getbyhwaddr_rcu - find a device by its hardware address * @net: the applicable net namespace @@ -1130,7 +1136,7 @@ int netdev_get_name(struct net *net, char *name, int ifindex) * * Search for an interface by MAC address. Returns NULL if the device * is not found or a pointer to the device. - * The caller must hold RCU or RTNL. + * The caller must hold RCU. * The returned device has not had its ref count increased * and the caller must therefore be careful about locking * @@ -1142,14 +1148,38 @@ struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type, struct net_device *dev; for_each_netdev_rcu(net, dev) - if (dev->type == type && - !memcmp(dev->dev_addr, ha, dev->addr_len)) + if (dev_comp_addr(dev, type, ha)) return dev; return NULL; } EXPORT_SYMBOL(dev_getbyhwaddr_rcu); +/** + * dev_getbyhwaddr - find a device by its hardware address + * @net: the applicable net namespace + * @type: media type of device + * @ha: hardware address + * + * Similar to dev_getbyhwaddr_rcu(), but the owner needs to hold + * rtnl_lock. + * + * Return: pointer to the net_device, or NULL if not found + */ +struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, + const char *ha) +{ + struct net_device *dev; 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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Andrew Lunn , David Ahern Cc: linux-kernel@vger.kernel.org, netdev@vger.kernel.org, Breno Leitao , kuniyu@amazon.co.jp, ushankar@purestorage.com, kernel-team@meta.com, Kuniyuki Iwashima X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=1199; i=leitao@debian.org; h=from:subject:message-id; bh=jca81WNOd6H2xJFfjYv9JuvlMENwEsXJrCvol1J45WM=; b=owEBbQKS/ZANAwAIATWjk5/8eHdtAcsmYgBnrN6482LYBGt8CRaT/t1Bq3E+F+uhgEbi0+3PX dAVqYhaBICJAjMEAAEIAB0WIQSshTmm6PRnAspKQ5s1o5Of/Hh3bQUCZ6zeuAAKCRA1o5Of/Hh3 bVv6D/0cxzolWpAjDPxTX1g4vCzxOdGCx4Q+RBVRxgc+WPDvmR+B/YIRuoa4Xi0R+qVT9lzJBty kCJsjYZMHyallQa393ACZJFQmJQRkaHjqCQhqvAgkPxVD3mwmVrt0jZm6afd8FN6xeiIlvwKOxX Cp5faiyfIHKyiY5YaIU1N3Ck7KQBFQzkmD+PPVnupnIGSPB1edTezgwnAmgzE2362P0nuTQs8Nf AXJFSGK9KzHNkEU+8AlcfkyQBk/ZDoYiOJF2Q4brxOdjMSHt5GyRHedN2kB5GlLZsXJv0nEXaqr ka9TmkDKpU7NORpCX1D2wvgqfPFcDNnnppqMVmuspHs7G6T1kaPtZOVVHEb3S7Ur8jmMAoIQOUa 5A78BxWZZF0f7BHwqgX2taZwkFuSgzove/7TeKCsnZ6xjApemVWFvcRBdRLZOzIM/Vm8ttiQAEZ ZNBrnn8fgO+p6SXUyZpvaFHQp6QYmbfwP7SY8EBHiHzc8rjsJkMHjv+Ej+ntHPQMliiN2pOMGQ2 zdqc9k1n0QpfzXxLtbLsJfqiyuO5Q/fd8+JI8mKlsKviA6zphSohlbVqWfn0lZ/B5qQwS8kycCR CU0m06UWW1hMSKnlnB0GqYf2FTCMAOkxOVSZ+CI367ZFwI22N3HlGVT74L5eXu+5RFwn/Zlg5tL Gm90fS3+puZKkqA== X-Developer-Key: i=leitao@debian.org; a=openpgp; fpr=AC8539A6E8F46702CA4A439B35A3939FFC78776D X-Patchwork-Delegate: kuba@kernel.org The arp_req_set_public() function is called with the RTNL lock held, which provides enough synchronization protection. This makes the RCU variant of dev_getbyhwaddr() unnecessary. Switch to using the simpler dev_getbyhwaddr() function since we already have the required rtnl locking. This change helps maintain consistency in the networking code by using the appropriate helper function for the existing locking context. Suggested-by: Kuniyuki Iwashima Signed-off-by: Breno Leitao Reviewed-by: Kuniyuki Iwashima --- net/ipv4/arp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c index cb9a7ed8abd3ab17403f226ea7e31ea2bae52a9f..1867de1cd156fa91bb3ed4a2c12cafd69d11468a 100644 --- a/net/ipv4/arp.c +++ b/net/ipv4/arp.c @@ -1075,7 +1075,7 @@ static int arp_req_set_public(struct net *net, struct arpreq *r, __be32 mask = ((struct sockaddr_in *)&r->arp_netmask)->sin_addr.s_addr; if (!dev && (r->arp_flags & ATF_COM)) { - dev = dev_getbyhwaddr_rcu(net, r->arp_ha.sa_family, + dev = dev_getbyhwaddr(net, r->arp_ha.sa_family, r->arp_ha.sa_data); if (!dev) return -ENODEV;