From nobody Thu Oct 2 13:03:27 2025 Received: from mail-ej1-f42.google.com (mail-ej1-f42.google.com [209.85.218.42]) (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 566C134DCF7 for ; Wed, 17 Sep 2025 09:58:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.218.42 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758103103; cv=none; b=AziViWQJVJEPQl7aXUfoRYYVxitKwAlmMWHTKRwShypskLpEcY/Fn/V2WWJ83XzFR3XkzZ7o7Mq/hpbx0rVOPjkaYKnNKVEFm4nHUUefCqwtJxU4KhiYnqIWo325VylnoqEshKJgu4R5J2el2joF0Wnp5OCYHcXmRoODc0/QX0w= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758103103; c=relaxed/simple; bh=4qXNf5FPKeqB6oI1PmmIoli/4B/k2fYlPhoDMAj4Ltg=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=Bi+YLXdh4v/CP8KPq0x0jvBjCFd0ovZ1PjhRB9Lz4xSNNH0Je3cqcRontjr2v9oAoOv4/q4tjoU7u3KRhnko/EASBOApToKWEUN/sGlDAEuunRGJfgJvjgV2YN37qQYwuXdQbb/Lk7Z1WRy5f6Az/lefipoh/OsJojdwonpByb8= 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=209.85.218.42 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-f42.google.com with SMTP id a640c23a62f3a-b07c28f390eso884490066b.2 for ; Wed, 17 Sep 2025 02:58:21 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1758103100; x=1758707900; 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=AEyyDJEjHIGcptoyVMY30XDmajElEFVLCjxYGTHfuEc=; b=WlvP06gEV0yTvYFdrU4DHUTSRPWN6vx4N9cPVy1a9dZQ9qdvaRZ9qeNYCXMEYqEzR2 K9ohOgDzsIVO8CHbNpCR/gjrE90IerSJmyXzGABM5k8rcU566b5bHOHercwF3nKFrrts Cuk4HG5WkYygVQIdo/FK+o5EIeOgPGrWdsrCgxYBsrOD/DGU830wK/YDiGd5Fkq+/d2K K+W6cHLkShznNhokz02z3O038wHiMQ0tFJFWLIMcCYJvlK4IotmgTXC13rUJxzKxEYQI APdQ/a22SpauKklta7opS6gfjom6yg58dhHWQD8bakP3+DFsAcxVC9V/2vybsmDYriQV 08Cg== X-Forwarded-Encrypted: i=1; AJvYcCVvzpCu7UElRBMbwSe3a6lyBjQx7Q3nIlMFpgf0YN5171BfmdFaU/s/WRTVSA2MMOxHS/laEe0y4p5Jpsg=@vger.kernel.org X-Gm-Message-State: AOJu0Yx0x87QnKaQBcEwZCb7LSTcpTWWa+qRMgMdeR9+SgvwjLAD2rnL 2y7O2vnVTOC+gn3a2kbS5dX2AKstcQ4KRP5AINrBFHQ5Chedr/rciQYT X-Gm-Gg: ASbGnctQkaez3RKmaU03cusf313hBGGHk2njTYyddLJQ/dwt/mccMO0bGAOAzZcPrhl rKTEd2zu/Vg+yqkQqKGHd93NTXpAyXiXBxR5EfS51pOnLZdF2B9k8iwTIFVBNAn8xArzws9JMWb aCxOUXchojxQwpCKbXmn893/PoaN1M/nukKwPM9J7VFOOdHZSKmUIWAhlCjNaGdDXNhuAnCc3EN Oj+R+stirhxFGISKV1GpmBjkJk9GwpGdOH0XadQu+WG4yxYeuDVOjvbaaQbjUxKBY+hoNOAjKO7 pIdf+2MkXi76400Vr7TG0OAEkzVBDGgdbAohIkBMtu7AqPmu/eXb+GBWTmYvcRqW1A4OtMp7KVP vHHpXzMEWITdpEA== X-Google-Smtp-Source: AGHT+IFmKSMVHhuFIvQinupVyiUNckMKMb5lWYss0WThxAB0V4vANhmyHX6vXQLprkM//2EeY/ySKg== X-Received: by 2002:a17:907:3c88:b0:b0c:a265:c02c with SMTP id a640c23a62f3a-b1bb5e572e9mr222242866b.12.1758103099498; Wed, 17 Sep 2025 02:58:19 -0700 (PDT) Received: from localhost ([2a03:2880:30ff:42::]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b07b31291b0sm1343812366b.34.2025.09.17.02.58.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 17 Sep 2025 02:58:19 -0700 (PDT) From: Breno Leitao Date: Wed, 17 Sep 2025 02:58:09 -0700 Subject: [PATCH net-next v4 2/8] net: ethtool: add support for ETHTOOL_GRXRINGS ioctl 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: <20250917-gxrings-v4-2-dae520e2e1cb@debian.org> References: <20250917-gxrings-v4-0-dae520e2e1cb@debian.org> In-Reply-To: <20250917-gxrings-v4-0-dae520e2e1cb@debian.org> To: Andrew Lunn , "David S. Miller" , Eric Dumazet , Paolo Abeni , kuba@kernel.org, Simon Horman , "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , =?utf-8?q?Eugenio_P=C3=A9rez?= , Andrew Lunn Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, virtualization@lists.linux.dev, Breno Leitao , Lei Yang , kernel-team@meta.com X-Mailer: b4 0.15-dev-dd21f X-Developer-Signature: v=1; a=openpgp-sha256; l=2335; i=leitao@debian.org; h=from:subject:message-id; bh=4qXNf5FPKeqB6oI1PmmIoli/4B/k2fYlPhoDMAj4Ltg=; b=owEBbQKS/ZANAwAIATWjk5/8eHdtAcsmYgBoyoY2AU9fNvTISS+beBqpJEDcxAHhVAhTAHCq9 srn6uWzgxqJAjMEAAEIAB0WIQSshTmm6PRnAspKQ5s1o5Of/Hh3bQUCaMqGNgAKCRA1o5Of/Hh3 bav/EACG9P0Yxm8JP5TFsL1itesM8mMX5t+D87Z7fjw6n/bPC8stKFKiHf4HO5v6ao/MvPQu0c6 a49OqGLI01YJ+gEMnKPZ0s0AaOGZsscXy9tIxTG+1SFZ3IThHyVa8bA7suuTJ00vfXfBxinTG6N /vQjRj4a+IA60KFNI89/iBpirfrMMsnSdDNMmPXcs6bQycFimuQEs8RZpCJC1JJxoT4Z4reolko ajaTnJ8EXw+lhqb4nx6wk8fDbuepbVVhkajeE0mSoNQz4hFJ69fc+stXB6qnluuG+XrvwisMhMw MgNzQVN+4DdcfxRZ+EJOWzGKyhg47SyLTZDKO+NwvJT0Wm9hFXDlAxWg0427Ba2zwPssv9vWFRT SyMaxhyNbAmHzZjndir82/49HKpIy9yGo2Nw/XyZLy740CSoZUnBLmxgykZf0P09szeo3s+yp1V 9CnOZipMsiD4/cHsLlnIgZZOlrl5V2SJ+1uJ1LIolKgGdajfCzotoOWJC9Uqo85dIYaeKifvtbG lU07fl8zCdwmRGI8hFt6PGiQotMAlaWXNnAQ2WQdEKAQ/VlDuQe9npNeKy5cgN3GwD7pgN4PjIz RTZ2eRKu1NI8kZU9/pDXFoCiz7JRobHeYh4xaE2Fir85ZF8XlLt2dCrZUkgXEHIp92TG2Fnna2r ajP6h36DirNPoVQ== X-Developer-Key: i=leitao@debian.org; a=openpgp; fpr=AC8539A6E8F46702CA4A439B35A3939FFC78776D This patch adds handling for the ETHTOOL_GRXRINGS ioctl command in the ethtool ioctl dispatcher. It introduces a new helper function ethtool_get_rxrings() that calls the driver's get_rxnfc() callback with appropriate parameters to retrieve the number of RX rings supported by the device. By explicitly handling ETHTOOL_GRXRINGS, userspace queries through ethtool can now obtain RX ring information in a structured manner. In this patch, ethtool_get_rxrings() is a simply copy of ethtool_get_rxnfc(). Signed-off-by: Breno Leitao --- net/ethtool/ioctl.c | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c index 15627afa4424f..4214ab33c3c81 100644 --- a/net/ethtool/ioctl.c +++ b/net/ethtool/ioctl.c @@ -1208,6 +1208,44 @@ static noinline_for_stack int ethtool_set_rxnfc(stru= ct net_device *dev, return 0; } =20 +static noinline_for_stack int ethtool_get_rxrings(struct net_device *dev, + u32 cmd, + void __user *useraddr) +{ + struct ethtool_rxnfc info; + size_t info_size =3D sizeof(info); + const struct ethtool_ops *ops =3D dev->ethtool_ops; + int ret; + void *rule_buf =3D NULL; + + if (!ops->get_rxnfc) + return -EOPNOTSUPP; + + ret =3D ethtool_rxnfc_copy_struct(cmd, &info, &info_size, useraddr); + if (ret) + return ret; + + if (info.cmd =3D=3D ETHTOOL_GRXCLSRLALL) { + if (info.rule_cnt > 0) { + if (info.rule_cnt <=3D KMALLOC_MAX_SIZE / sizeof(u32)) + rule_buf =3D kcalloc(info.rule_cnt, sizeof(u32), + GFP_USER); + if (!rule_buf) + return -ENOMEM; + } + } + + ret =3D ops->get_rxnfc(dev, &info, rule_buf); + if (ret < 0) + goto err_out; + + ret =3D ethtool_rxnfc_copy_to_user(useraddr, &info, info_size, rule_buf); +err_out: + kfree(rule_buf); + + return ret; +} + static noinline_for_stack int ethtool_get_rxnfc(struct net_device *dev, u32 cmd, void __user *useraddr) { @@ -3377,6 +3415,8 @@ __dev_ethtool(struct net *net, struct ifreq *ifr, voi= d __user *useraddr, rc =3D ethtool_set_rxfh_fields(dev, ethcmd, useraddr); break; case ETHTOOL_GRXRINGS: + rc =3D ethtool_get_rxrings(dev, ethcmd, useraddr); + break; case ETHTOOL_GRXCLSRLCNT: case ETHTOOL_GRXCLSRULE: case ETHTOOL_GRXCLSRLALL: --=20 2.47.3