From nobody Tue Dec 2 02:06:45 2025 Received: from unimail.uni-dortmund.de (mx1.hrz.uni-dortmund.de [129.217.128.51]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0550435FF72; Thu, 20 Nov 2025 15:30:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=129.217.128.51 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763652611; cv=none; b=Mb6KAe66AlknyA0AJdzIYhJZdQhRkPTiUVEJaJQZnxsOTlV1H/00OzaX4HlEwSZVrsUlugKw20GG/kgTQVGkPQiBfw7UBLShZSXuttzlL1fd+fEADhOyQmGuzQtfjR0x2ZTYrmW7C8zisohUrNRKF7hAGcbohP7HaV3QS0NUBVI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763652611; c=relaxed/simple; bh=M9BqjS78vJlMtvWvaK6+E01V48j5liMIIf/uZ5gvlXQ=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=mlzt08wyV26GN8TWSGHd19pbCi7y4zmKqtOxjgkpyVprgt7pNl73Q9Pg8OAsCxvbuhO1fOhML3IChBKvOn8HQ5IZhTX4rsG72lpQhLMrrPrbgOejWSxwK2Kj2fjPkf8DtCyPytyQlXxx0rGXO5XwPj99pp0+E/mGN0JQ4q0vPdU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=tu-dortmund.de; spf=pass smtp.mailfrom=tu-dortmund.de; arc=none smtp.client-ip=129.217.128.51 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=tu-dortmund.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=tu-dortmund.de Received: from simon-Latitude-5450.cni.e-technik.tu-dortmund.de ([129.217.186.248]) (authenticated bits=0) by unimail.uni-dortmund.de (8.18.1.10/8.18.1.10) with ESMTPSA id 5AKFTu8I005406 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NOT); Thu, 20 Nov 2025 16:29:58 +0100 (CET) From: Simon Schippers To: willemdebruijn.kernel@gmail.com, jasowang@redhat.com, andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, mst@redhat.com, eperezma@redhat.com, jon@nutanix.com, tim.gebauer@tu-dortmund.de, simon.schippers@tu-dortmund.de, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, virtualization@lists.linux.dev Subject: [PATCH net-next v6 6/8] tun/tap: add helper functions to check file type Date: Thu, 20 Nov 2025 16:29:11 +0100 Message-ID: <20251120152914.1127975-7-simon.schippers@tu-dortmund.de> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20251120152914.1127975-1-simon.schippers@tu-dortmund.de> References: <20251120152914.1127975-1-simon.schippers@tu-dortmund.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add tun_is_tun_file() and tap_is_tap_file() helper functions to check if a file is a TUN or TAP file, which will be utilized by vhost-net. Co-developed-by: Tim Gebauer Signed-off-by: Tim Gebauer Co-developed by: Jon Kohler Signed-off-by: Jon Kohler Signed-off-by: Simon Schippers --- drivers/net/tap.c | 13 +++++++++++++ drivers/net/tun.c | 13 +++++++++++++ include/linux/if_tap.h | 5 +++++ include/linux/if_tun.h | 6 ++++++ 4 files changed, 37 insertions(+) diff --git a/drivers/net/tap.c b/drivers/net/tap.c index 0069e2f177f4..56b8fe376e4a 100644 --- a/drivers/net/tap.c +++ b/drivers/net/tap.c @@ -1283,6 +1283,19 @@ struct ptr_ring *tap_get_ptr_ring(struct file *file) } EXPORT_SYMBOL_GPL(tap_get_ptr_ring); =20 +bool tap_is_tap_file(struct file *file) +{ + struct tap_queue *q; + + if (file->f_op !=3D &tap_fops) + return false; + q =3D file->private_data; + if (!q) + return false; + return true; +} +EXPORT_SYMBOL_GPL(tap_is_tap_file); + int tap_queue_resize(struct tap_dev *tap) { struct net_device *dev =3D tap->dev; diff --git a/drivers/net/tun.c b/drivers/net/tun.c index bf109440d2c7..dc2d267d30d7 100644 --- a/drivers/net/tun.c +++ b/drivers/net/tun.c @@ -3860,6 +3860,19 @@ struct ptr_ring *tun_get_tx_ring(struct file *file) } EXPORT_SYMBOL_GPL(tun_get_tx_ring); =20 +bool tun_is_tun_file(struct file *file) +{ + struct tun_file *tfile; + + if (file->f_op !=3D &tun_fops) + return false; + tfile =3D file->private_data; + if (!tfile) + return false; + return true; +} +EXPORT_SYMBOL_GPL(tun_is_tun_file); + module_init(tun_init); module_exit(tun_cleanup); MODULE_DESCRIPTION(DRV_DESCRIPTION); diff --git a/include/linux/if_tap.h b/include/linux/if_tap.h index 28326a69745a..14194342b784 100644 --- a/include/linux/if_tap.h +++ b/include/linux/if_tap.h @@ -14,6 +14,7 @@ struct ptr_ring *tap_get_ptr_ring(struct file *file); int tap_ring_consume_batched(struct file *file, void **array, int n); void tap_ring_unconsume(struct file *file, void **batch, int n, void (*destroy)(void *)); +bool tap_is_tap_file(struct file *file); #else #include #include @@ -32,6 +33,10 @@ static inline int tap_ring_consume_batched(struct file *= f, } static inline void tap_ring_unconsume(struct file *file, void **batch, int n, void (*destroy)(void *)) {} +static inline bool tap_is_tap_file(struct file *f) +{ + return false; +} #endif /* CONFIG_TAP */ =20 /* diff --git a/include/linux/if_tun.h b/include/linux/if_tun.h index 1274c6b34eb6..0910c6dbac20 100644 --- a/include/linux/if_tun.h +++ b/include/linux/if_tun.h @@ -25,6 +25,7 @@ struct ptr_ring *tun_get_tx_ring(struct file *file); int tun_ring_consume_batched(struct file *file, void **array, int n); void tun_ring_unconsume(struct file *file, void **batch, int n, void (*destroy)(void *)); +bool tun_is_tun_file(struct file *file); =20 static inline bool tun_is_xdp_frame(void *ptr) { @@ -67,6 +68,11 @@ static inline int tun_ring_consume_batched(struct file *= file, static inline void tun_ring_unconsume(struct file *file, void **batch, int n, void (*destroy)(void *)) {} =20 +static inline bool tun_is_tun_file(struct file *f) +{ + return false; +} + static inline bool tun_is_xdp_frame(void *ptr) { return false; --=20 2.43.0