From nobody Fri Dec 19 01:43:38 2025 Received: from mail-pj1-f73.google.com (mail-pj1-f73.google.com [209.85.216.73]) (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 EA2611E3774 for ; Thu, 20 Feb 2025 02:09:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.73 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740017377; cv=none; b=dqEH532R0f8YZk+omuuJtG9Pu493Ek8dSQIvMXc3aUQBH0gLDBwwYaDrG6oulSx80Q250gkjj0KwUY6WTZ+nfHUun6dvx3mvK3QMKkRoKOWHYUem/0DAGQBemB0PI0yK3A7YtjMa8IASJpQIkzlwXupinP79bopADxlW1DRIwDU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740017377; c=relaxed/simple; bh=xktwRXpJMJv986Qo4eDPxj726JXR+3eKG4eS+/XdbOE=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=IZhOHkoXcdi8eV86ekBVIB6nfIHuS4tj1u3yZAHyvSVHN1Nt4rhMS/olol2tLl+VQuB9vSRLpfQEhzJpbkSPv0TIgPr3H2fdAYorpZTBLWqnkeeeW3ATPTj/jEMFmepcXisaAbY5WFEAUkIx/IB6ZhsPQPQUlcRtjPiGKaKyFQQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--almasrymina.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=O8lEYp+B; arc=none smtp.client-ip=209.85.216.73 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--almasrymina.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="O8lEYp+B" Received: by mail-pj1-f73.google.com with SMTP id 98e67ed59e1d1-2f83e54432dso1464268a91.2 for ; Wed, 19 Feb 2025 18:09:34 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1740017374; x=1740622174; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=ouoTtMMhd3rb00vY+DSWvls3bj0wfOCkxx6qaQ7XOwM=; b=O8lEYp+B+GVf5CBtc+j9zd8esl5qp9PbFOIlFXkgRUQrAGZZrELqla2NTPg2aK3emc sl3cy3BV5y91hr5LK3qG+VwHZwZ2d4PjgEuHdJ1NGrU5WZ07DfNEmLdF6izUbgNRSiH+ 0YEb/8yk+ZX8vKRG5Dimu7PlTeE6MPmgMxqvqWlhwum6FXBiPgS0DFvTK9raF9wguRHu 1KbRNK0uKflT++GpxkxUaRep2pIYBQbr6A9L6xvl1dI7LngmEsmYYE2Z8hbWmR6xEp9m WtCI4gzjWX14ITRR8T/v0SDRP5fH/YhfbxFwKkPGmqMrS8cTNR9F5y16RwsDTHJqYXV1 r3wg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1740017374; x=1740622174; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=ouoTtMMhd3rb00vY+DSWvls3bj0wfOCkxx6qaQ7XOwM=; b=ujsLlPfXCkp4oO6iKddYXDhFnBN0SrX8330Q1FNkKmid+URiVQZQTRWFHmM4eVSETU 8LKmqb7FxOGZqJyg6SnTPUvbC3Uq6dLMhB/kOV89SWWtlCs/WNAW31BAVeY3eNnMX558 7IznP+Ib4BRjj7oNAjIjCWiBt/9wLDYKgT/zva0GaGC3v2mcWsXBATGOTpqByR8PPRqE 8uTM4I5Q/TBXeS8MeVbhJ35mWtBy+s5ppL/6iC/NLdBwm8kIe/wbjxTl/Jet7hbMSjY6 FRV1ZOLbi+XwFNq7mJNQfXWfckocOiE2Q2kYk6xrz3dHnGSCDDhlKZtRUr3jsGkwUT+w BzLA== X-Forwarded-Encrypted: i=1; AJvYcCXQTTVxFjHo06iGW6Pi+LuP2R6mIyZZ/Kfai227HObxFYMcoWhKckLwq6J4kOEMzfXj54FUoe8trqz4e4Q=@vger.kernel.org X-Gm-Message-State: AOJu0YxE9vY4x9gdKvrxELuqWGBfD0wztVXKjf3RtpDfX9K/fmtQwm71 Qf2SAaoJBcDA80JVJMnKUonuYKFH2XUnQQm59HMdowidH8N7KxWsO2u9RSFBWcREjnHFV78dcue UMOsycyDbdpqw5kRERmacug== X-Google-Smtp-Source: AGHT+IE63Y1j485C5r+SG910yHgU7D0EniRUvxRKp0z0ZOdOvF2csyUI5aFQVIvnQkQW3zk2gmV0Mv7QAnOs+6jCLQ== X-Received: from pjc8.prod.google.com ([2002:a17:90b:2f48:b0:2eb:12d7:fedd]) (user=almasrymina job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90b:5202:b0:2fc:3264:3657 with SMTP id 98e67ed59e1d1-2fcb56f6d59mr11204857a91.0.1740017374316; Wed, 19 Feb 2025 18:09:34 -0800 (PST) Date: Thu, 20 Feb 2025 02:09:13 +0000 In-Reply-To: <20250220020914.895431-1-almasrymina@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250220020914.895431-1-almasrymina@google.com> X-Mailer: git-send-email 2.48.1.601.g30ceb7b040-goog Message-ID: <20250220020914.895431-9-almasrymina@google.com> Subject: [PATCH net-next v4 8/9] net: check for driver support in netmem TX From: Mina Almasry To: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, virtualization@lists.linux.dev, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org Cc: Mina Almasry , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Donald Hunter , Jonathan Corbet , Andrew Lunn , Jeroen de Borst , Praveen Kaligineedi , Shailend Chand , Kuniyuki Iwashima , Willem de Bruijn , David Ahern , Neal Cardwell , "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , "=?UTF-8?q?Eugenio=20P=C3=A9rez?=" , Stefan Hajnoczi , Stefano Garzarella , Shuah Khan , sdf@fomichev.me, asml.silence@gmail.com, dw@davidwei.uk, Jamal Hadi Salim , Victor Nogueira , Pedro Tammela , Samiullah Khawaja Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" We should not enable netmem TX for drivers that don't declare support. Check for driver netmem TX support during devmem TX binding and fail if the driver does not have the functionality. Check for driver support in validate_xmit_skb as well. Signed-off-by: Mina Almasry Acked-by: Stanislav Fomichev --- v4: - New patch --- net/core/dev.c | 3 +++ net/core/netdev-genl.c | 7 +++++++ 2 files changed, 10 insertions(+) diff --git a/net/core/dev.c b/net/core/dev.c index ebc000b56828..f65a2b41a2c3 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -3850,6 +3850,9 @@ static struct sk_buff *validate_xmit_skb(struct sk_bu= ff *skb, struct net_device =20 skb =3D validate_xmit_xfrm(skb, features, again); =20 + if (!skb_frags_readable(skb) && !dev->netmem_tx) + goto out_kfree_skb; + return skb; =20 out_kfree_skb: diff --git a/net/core/netdev-genl.c b/net/core/netdev-genl.c index 1faa2cf4057f..a154480a6e22 100644 --- a/net/core/netdev-genl.c +++ b/net/core/netdev-genl.c @@ -970,6 +970,13 @@ int netdev_nl_bind_tx_doit(struct sk_buff *skb, struct= genl_info *info) goto err_unlock; } =20 + if (!netdev->netmem_tx) { + err =3D -EOPNOTSUPP; + NL_SET_ERR_MSG(info->extack, + "Driver does not support netmem TX"); + goto err_unlock; + } + binding =3D net_devmem_bind_dmabuf(netdev, DMA_TO_DEVICE, dmabuf_fd, info->extack); if (IS_ERR(binding)) { --=20 2.48.1.601.g30ceb7b040-goog