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[34.48.33.21]) by smtp.gmail.com with UTF8SMTPSA id 00721157ae682-794da35c55dsm2032817b3.53.2026.02.01.13.00.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 01 Feb 2026 13:00:50 -0800 (PST) Date: Sun, 01 Feb 2026 16:00:49 -0500 From: Willem de Bruijn To: Steffen Trumtrar , "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Richard Cochran , Willem de Bruijn , Andrew Lunn , =?UTF-8?B?RXVnZW5pbyBQw6lyZXo=?= Cc: virtualization@lists.linux.dev, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Steffen Trumtrar Message-ID: In-Reply-To: <20260129-v6-7-topic-virtio-net-ptp-v2-1-30a27dc52760@pengutronix.de> References: <20260129-v6-7-topic-virtio-net-ptp-v2-0-30a27dc52760@pengutronix.de> <20260129-v6-7-topic-virtio-net-ptp-v2-1-30a27dc52760@pengutronix.de> Subject: Re: [PATCH RFC v2 1/2] tun: support rx-tstamp Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Steffen Trumtrar wrote: > Demonstrate support for new virtio-net features > > VIRTIO_NET_HDR_F_TSTAMP > > This is not intended to be merged. > > A full feature test also requires a patched qemu binary that knows > these features and negotiates correct vnet_hdr_sz in > virtio_net_set_mrg_rx_bufs. See > https://github.com/strumtrar/qemu/tree/v10.2.0/virtio-rx-stamps > > Not-yet-signed-off-by: Steffen Trumtrar > --- > drivers/net/tun.c | 30 ++++++++++++++++++------------ > 1 file changed, 18 insertions(+), 12 deletions(-) > > diff --git a/drivers/net/tun.c b/drivers/net/tun.c > index 8192740357a09..aa988a9c4bc99 100644 > --- a/drivers/net/tun.c > +++ b/drivers/net/tun.c > @@ -2065,23 +2065,29 @@ static ssize_t tun_put_user(struct tun_struct *tun, > } > > if (vnet_hdr_sz) { > - struct virtio_net_hdr_v1_hash_tunnel hdr; > - struct virtio_net_hdr *gso; > + struct virtio_net_hdr_v1_hash_tunnel_ts hdr; This patch refers to a struct that does not exist yet, so this cannot compile? > + > + memset(&hdr, 0, sizeof(hdr)); > > ret = tun_vnet_hdr_tnl_from_skb(tun->flags, tun->dev, skb, > - &hdr); > + (struct virtio_net_hdr_v1_hash_tunnel *)&hdr); > if (ret) > return ret; > > - /* > - * Drop the packet if the configured header size is too small > - * WRT the enabled offloads. > - */ > - gso = (struct virtio_net_hdr *)&hdr; > - ret = __tun_vnet_hdr_put(vnet_hdr_sz, tun->dev->features, > - iter, gso); > - if (ret) > - return ret; > + if (vnet_hdr_sz >= sizeof(struct virtio_net_hdr_v1_hash_tunnel_ts)) { > + __le64 tstamp = cpu_to_le64(ktime_get_ns()); > + > + hdr.tstamp_0 = (tstamp & 0x000000000000ffffULL) >> 0; > + hdr.tstamp_1 = (tstamp & 0x00000000ffff0000ULL) >> 16; > + hdr.tstamp_2 = (tstamp & 0x0000ffff00000000ULL) >> 32; > + hdr.tstamp_3 = (tstamp & 0xffff000000000000ULL) >> 48; > + } > + > + if (unlikely(iov_iter_count(iter) < vnet_hdr_sz)) > + return -EINVAL; > + > + if (unlikely(copy_to_iter(&hdr, vnet_hdr_sz, iter) != vnet_hdr_sz)) > + return -EFAULT; > } > > if (vlan_hlen) { > > -- > 2.52.0 >