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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Andrew Lunn Cc: linux-kernel@vger.kernel.org, netdev@vger.kernel.org, Breno Leitao , kernel-team@meta.com X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=1137; i=leitao@debian.org; h=from:subject:message-id; bh=yd5ec2CLDNzLfC0/a2RFUqinpthomFfOpRSaGwmcrrg=; b=owEBbQKS/ZANAwAIATWjk5/8eHdtAcsmYgBnqelloQdo9lkAQ3XqxZjt8TdMsyq1/vNI1DGUU jUotBv262iJAjMEAAEIAB0WIQSshTmm6PRnAspKQ5s1o5Of/Hh3bQUCZ6npZQAKCRA1o5Of/Hh3 bR+WD/9aLq/QZ+ctGMx9jDvh0AAKnC6LTEd1CFmvXLEFOAdb3Z2M8xt6B60BdWdQWjdblYh+aaR CA6w6utmIIpoaMTm3+JQNpnFPOTRAWihmxfhN1bqSJTxl26KlCudNRtf1H6lOGWuqvNxIr+3PQM BqZYoByLRyK0nOGbNLVjvPfYv6uhHPRK3E70w1s66P4GqIpdhwd0WrDEQ0zLLk+UGMy6P/P/p9p 85TxbxWMS4ysvS9sB2qincu07Y99lqQq8yUkexxZu6q0hf0Qx9jKGsSUMqu7scgDcBWI2rXF2ni FnYhQLeamD0Ez+GW0LSg/VzLNiPyZYbnFnmnF+BKuLTp5YiwucrdmaSGNVl8sgzPKhs7I4YS62I 5XKMq+VoM8tExPkSxrOwQRGumTYB+RlJSZimafV8Z++ETG1zC3Yd8rJmIRjFlpejPsjnIYepK1K gth662Wv2REvtInOn8RkMMX+/hzRBAccI0a+GiDnlEOQXy72shi2qYO2f2sroC0uKqxnrfJW4D5 fVzHnz4M+upIqW6Vp4hPMZeaQO8+9KZ+d8IjzKt/p3BPX5PJk1HZ44Su9kWE9u+2D7RKAmuygXA WXwCldhQNZJsO+yaGQKp+2jv9EWPXblsFch0lrXLxAdANv0RQETmWeYb2ozU1d4J8wVhbCbSMx+ LIravQGQy/c2bwg== X-Developer-Key: i=leitao@debian.org; a=openpgp; fpr=AC8539A6E8F46702CA4A439B35A3939FFC78776D 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 'de= v_getbyhwaddr_rcu' [1] Link: https://netdev.bots.linux.dev/static/nipa/931564/13964899/kdoc/su= mmary 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 c41d1e1cbf62e0c5778c472cdb947b6f140f6064..c7e726f81406ece98801441dce3= d683c8e0c9d99 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -1133,8 +1133,8 @@ 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 typ= e, const char *ha) { --=20 2.43.5 From nobody Tue Dec 16 22:00:08 2025 Received: from mail-ej1-f47.google.com (mail-ej1-f47.google.com [209.85.218.47]) (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 1E76C1F8AF8; Mon, 10 Feb 2025 11:56:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.218.47 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739188590; cv=none; b=Yjj1L+8B9w9oNyjJl7uwExiyxEDi9uaHWh7sazGmDK2g/77YBU5Dk0Zo3ObEBqaReu8Lb8taEstRS4dZeVB56sVcphu2j+9yjqYniUNK2lytzFh1cP8vaNhakqhXtK6zJCe/ocsUGd0AMMwpqZuoAGkVFseX+x1pjHLWNg1hJR0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739188590; c=relaxed/simple; bh=9qXMD7DKRRdpXXGGa3eUFsuBDPSVwnqaFAfpKKOmmHM=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=IIH0Jb40hyersXGbpHhGSBuI8INy+FSfRXszcA+3kE8j+y4/YlJie5CO/45KmTegDtplbMMAxTmGYfvvD4av04nWhGsxVk1ybkZgtNNdVpaZpn89JND1ozep3tpmn+TwIs/QaDK5KXU7kC0VpZIK09GJssW1hPnEwu7jo0s7p84= 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=209.85.218.47 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-ej1-f47.google.com with SMTP id a640c23a62f3a-ab7a342ef4eso383785066b.0; Mon, 10 Feb 2025 03:56:28 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1739188587; x=1739793387; 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=OMERjpwIrdcVA9o9RHksiHjsobY3OD/zSwX31FPJNBI=; b=Sbx/mTmnotIiBVc1Lhu8doi3dfuAvDts9tEP24ubwWVDi0Vvh70uxLoW8JyG8ZxZRl LbyOi6bJRSVkf4Airx1/zs4ESWLBQ50930LIs8JXMYck7U4UIcVImDbNrd5Uv8F1otL1 J7+pYl02GeZsxL97Ovy6w1E98X/pHcqdetsRHyxWPhjWX4dJAbE7bcMyC/CRbYtZLkPc lPnxqR3A7x0rRSHOE+0Z4YQ5c18hAaJf47wNe98JhOVhPUCvZJB/4efBe+DdiQAD5w7f yFN94JHCnOeBJd3ayEBqPQBg1wYHUHENIvY0Ya6vWszLNw4R5qYh9q2XwLlqnUAopTfp X3bQ== X-Forwarded-Encrypted: i=1; AJvYcCW5HJjIgHkd3Ky8TiZjg881LVFZFtLkEvNXnFsKPsR9pN2+vjqEGFqgcesczv7YoqQ6xYyGUIw=@vger.kernel.org X-Gm-Message-State: AOJu0YwmaS/2yX/5+DJE3tcQaFTBbrfejW2rmjLwGZo8ErHB5TQ8QzON S82GsdPXM8LVPt9r1vYd5pcmn3hKQV/g1ioby5VSvURGNbTPNKJu X-Gm-Gg: ASbGncujWmEADlgyXXVeWLXew5ui0TgUJiikgZmd4wnnm4bVH011W/GLv56DQDQdnES Y5DyQdHo0A7mpF9NqbZGPQuimX1zc2qjzsrfcLI98SpaJrzixFFHW/hIYe/f1F0bfMFSIpgeWtU dz+8o4oROZQY/OQuLmtN3gnMC6UiUOTnmWBuxkzSF4PffeGEBfaEHpSsauAUskG1SH1a60nbuIf HUi3ZlYQk/rivSjwakYTBWUMfZN9ITcBJfm5rSqIwLGJuTomUTZdK1qzuuVsQT0fqIzZS7BhpAg 49Tiyw== X-Google-Smtp-Source: AGHT+IGcFjSGks/05m3rV5CJD4HeNIWGYR5HugYAXLx2P6eXSRK/kHwMi+pDBpu+oYiAAzvxJ5tMCw== X-Received: by 2002:a17:907:d1f:b0:aa6:9461:a186 with SMTP id a640c23a62f3a-ab789c5179bmr1466759766b.46.1739188587116; Mon, 10 Feb 2025 03:56:27 -0800 (PST) Received: from localhost ([2a03:2880:30ff:7::]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-ab7860da0e7sm738693366b.110.2025.02.10.03.56.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 10 Feb 2025 03:56:26 -0800 (PST) From: Breno Leitao Date: Mon, 10 Feb 2025 03:56:14 -0800 Subject: [PATCH net-next v2 2/2] net: Add dev_getbyhwaddr_rtnl() helper Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250210-arm_fix_selftest-v2-2-ba84b5bc58c8@debian.org> References: <20250210-arm_fix_selftest-v2-0-ba84b5bc58c8@debian.org> In-Reply-To: <20250210-arm_fix_selftest-v2-0-ba84b5bc58c8@debian.org> To: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Andrew Lunn Cc: linux-kernel@vger.kernel.org, netdev@vger.kernel.org, Breno Leitao , kernel-team@meta.com, kuniyu@amazon.com, ushankar@purestorage.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=9qXMD7DKRRdpXXGGa3eUFsuBDPSVwnqaFAfpKKOmmHM=; b=owEBbQKS/ZANAwAIATWjk5/8eHdtAcsmYgBnqelmkHgavEJjD1R2wYYKAPTgq+UYa+sWoTtTc wPxLONeU4aJAjMEAAEIAB0WIQSshTmm6PRnAspKQ5s1o5Of/Hh3bQUCZ6npZgAKCRA1o5Of/Hh3 bbvnD/9qB+4cTBOJcQTZzGI1C79x9ReURdxRYNbUIlPRH/6AHnp5/FESXs6ZQbI0fMQlNRJNOiL AWyBppqFUFD4zhyheInb4uTWidpHBUuS6HtlBuoNhBsTYK8fnkKMHjZre4kSobb4LzIzTKwN+k1 +evI2kv6MdaVjX4C76P2lO9QzfO07xg77EVDCc6zTGwqE+626ZFYWmtAA9lm7vLh7jz1CadSr/1 GNS6nnBeHXMUfhb65kdAZuuV3WrGQdH1rd4q1/fpPuiaFgnDav+r+EkbHEKK/YKM+d1tzbaJ7im ntG+DO7Hle9GqaY3R7sUtS7vnxKP4uHIX5sLr/zbXOiGc5Tjj1TBpGS7qJTWwGX8t1vi+dSLjfQ 27ikqs0glqX9UwH1oV8PJLbWrPcC+jxJOG8TkeFbc8aL9lk7GRsR2wFXZUU/WGaXtIPpEC3KSVB zRbqFBE6EgF5FZHn866EFNpV1JaUZ22Fq34fNFkOtI3+tm83xpcMHamKhUgfzwuzppY1Nn5nLEn TkWeB5XjpzyfZe3acJpP9KuSMNwuWBw+VBbPhrNZYW2IXFi/pFW+tlPaHGR7uRC2QDwlYCJkIex YEIwxfRdYDWCbAIYrtu/mIs6uvJNJ5w170bffkLdDl9r0k0vgFQqYfSvc5jj0X4z05BkbBV9IeQ +jPsymdW9KHE4Ug== X-Developer-Key: i=leitao@debian.org; a=openpgp; fpr=AC8539A6E8F46702CA4A439B35A3939FFC78776D 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-1f= cac5@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 0deee1313f23a625242678c8e571533e69a05263..6f0f5d327b41bfd5e0ccf9a3e63= d6082bdf45d14 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -3271,6 +3271,8 @@ static inline struct net_device *first_net_device_rcu= (struct net *net) } =20 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 typ= e, const char *hwaddr); struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short ty= pe); diff --git a/net/core/dev.c b/net/core/dev.c index c7e726f81406ece98801441dce3d683c8e0c9d99..2a0fbb319b2ad1b2aae908bc87e= f19504cc42909 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -1121,6 +1121,12 @@ int netdev_get_name(struct net *net, char *name, int= ifindex) return ret; } =20 +static bool dev_comp_addr(struct net_device *dev, unsigned short type, + const char *ha) +{ + return dev->type =3D=3D type && !memcmp(dev->dev_addr, ha, dev->addr_len); +} + /** * dev_getbyhwaddr_rcu - find a device by its hardware address * @net: the applicable net namespace @@ -1129,7 +1135,7 @@ 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 * @@ -1141,14 +1147,38 @@ struct net_device *dev_getbyhwaddr_rcu(struct net *= net, unsigned short type, struct net_device *dev; =20 for_each_netdev_rcu(net, dev) - if (dev->type =3D=3D type && - !memcmp(dev->dev_addr, ha, dev->addr_len)) + if (dev_comp_addr(dev, type, ha)) return dev; =20 return NULL; } EXPORT_SYMBOL(dev_getbyhwaddr_rcu); =20 +/** + * 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; + + ASSERT_RTNL(); + for_each_netdev(net, dev) + if (dev_comp_addr(dev, type, ha)) + return dev; + + return NULL; +} +EXPORT_SYMBOL(dev_getbyhwaddr); + struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short ty= pe) { struct net_device *dev, *ret =3D NULL; --=20 2.43.5