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[80.230.39.63]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-42b53f174afsm33416600f8f.33.2025.11.18.13.45.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 18 Nov 2025 13:45:17 -0800 (PST) Date: Tue, 18 Nov 2025 16:45:14 -0500 From: "Michael S. Tsirkin" To: Daniel Jurgens Cc: netdev@vger.kernel.org, jasowang@redhat.com, pabeni@redhat.com, virtualization@lists.linux.dev, parav@nvidia.com, shshitrit@nvidia.com, yohadt@nvidia.com, xuanzhuo@linux.alibaba.com, eperezma@redhat.com, jgg@ziepe.ca, kevin.tian@intel.com, kuba@kernel.org, andrew+netdev@lunn.ch, edumazet@google.com Subject: Re: [PATCH net-next v11 10/12] virtio_net: Add support for IPv6 ethtool steering Message-ID: <20251118164400-mutt-send-email-mst@kernel.org> References: <20251118143903.958844-1-danielj@nvidia.com> <20251118143903.958844-11-danielj@nvidia.com> Precedence: bulk X-Mailing-List: virtualization@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 In-Reply-To: <20251118143903.958844-11-danielj@nvidia.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: CsO4j-ISAW0ClT5bbD59mpveV4ylIfUwoCGgEY-rmDc_1763502318 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Tue, Nov 18, 2025 at 08:39:00AM -0600, Daniel Jurgens wrote: > Implement support for IPV6_USER_FLOW type rules. > > Example: > $ ethtool -U ens9 flow-type ip6 src-ip fe80::2 dst-ip fe80::4 action 3 > Added rule with ID 0 > > The example rule will forward packets with the specified source and > destination IP addresses to RX ring 3. > > Signed-off-by: Daniel Jurgens > Reviewed-by: Parav Pandit > Reviewed-by: Shahar Shitrit > Reviewed-by: Xuan Zhuo I find it weird that this does not modify setup_eth_hdr_key_mask So it still hardcodes ETH_P_IP for all IP flows? For IPv6, should it not use ETH_P_IPV6 instead? how does it work? > --- > v4: commit message typo > --- > drivers/net/virtio_net.c | 89 ++++++++++++++++++++++++++++++++++++---- > 1 file changed, 81 insertions(+), 8 deletions(-) > > diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c > index c1adba60b6a8..78fc8f01b6c4 100644 > --- a/drivers/net/virtio_net.c > +++ b/drivers/net/virtio_net.c > @@ -6932,6 +6932,34 @@ static bool validate_ip4_mask(const struct virtnet_ff *ff, > return true; > } > > +static bool validate_ip6_mask(const struct virtnet_ff *ff, > + const struct virtio_net_ff_selector *sel, > + const struct virtio_net_ff_selector *sel_cap) > +{ > + bool partial_mask = !!(sel_cap->flags & VIRTIO_NET_FF_MASK_F_PARTIAL_MASK); > + struct ipv6hdr *cap, *mask; > + > + cap = (struct ipv6hdr *)&sel_cap->mask; > + mask = (struct ipv6hdr *)&sel->mask; > + > + if (!ipv6_addr_any(&mask->saddr) && > + !check_mask_vs_cap(&mask->saddr, &cap->saddr, > + sizeof(cap->saddr), partial_mask)) > + return false; > + > + if (!ipv6_addr_any(&mask->daddr) && > + !check_mask_vs_cap(&mask->daddr, &cap->daddr, > + sizeof(cap->daddr), partial_mask)) > + return false; > + > + if (mask->nexthdr && > + !check_mask_vs_cap(&mask->nexthdr, &cap->nexthdr, > + sizeof(cap->nexthdr), partial_mask)) > + return false; > + > + return true; > +} > + > static bool validate_mask(const struct virtnet_ff *ff, > const struct virtio_net_ff_selector *sel) > { > @@ -6946,6 +6974,9 @@ static bool validate_mask(const struct virtnet_ff *ff, > > case VIRTIO_NET_FF_MASK_TYPE_IPV4: > return validate_ip4_mask(ff, sel, sel_cap); > + > + case VIRTIO_NET_FF_MASK_TYPE_IPV6: > + return validate_ip6_mask(ff, sel, sel_cap); > } > > return false; > @@ -6968,11 +6999,38 @@ static void parse_ip4(struct iphdr *mask, struct iphdr *key, > } > } > > +static void parse_ip6(struct ipv6hdr *mask, struct ipv6hdr *key, > + const struct ethtool_rx_flow_spec *fs) > +{ > + const struct ethtool_usrip6_spec *l3_mask = &fs->m_u.usr_ip6_spec; > + const struct ethtool_usrip6_spec *l3_val = &fs->h_u.usr_ip6_spec; > + > + if (!ipv6_addr_any((struct in6_addr *)l3_mask->ip6src)) { > + memcpy(&mask->saddr, l3_mask->ip6src, sizeof(mask->saddr)); > + memcpy(&key->saddr, l3_val->ip6src, sizeof(key->saddr)); > + } > + > + if (!ipv6_addr_any((struct in6_addr *)l3_mask->ip6dst)) { > + memcpy(&mask->daddr, l3_mask->ip6dst, sizeof(mask->daddr)); > + memcpy(&key->daddr, l3_val->ip6dst, sizeof(key->daddr)); > + } > + > + if (l3_mask->l4_proto) { > + mask->nexthdr = l3_mask->l4_proto; > + key->nexthdr = l3_val->l4_proto; > + } > +} > + > static bool has_ipv4(u32 flow_type) > { > return flow_type == IP_USER_FLOW; > } > > +static bool has_ipv6(u32 flow_type) > +{ > + return flow_type == IPV6_USER_FLOW; > +} > + > static int setup_classifier(struct virtnet_ff *ff, > struct virtnet_classifier **c) > { > @@ -7108,6 +7166,7 @@ static bool supported_flow_type(const struct ethtool_rx_flow_spec *fs) > switch (fs->flow_type) { > case ETHER_FLOW: > case IP_USER_FLOW: > + case IPV6_USER_FLOW: > return true; > } > > @@ -7150,7 +7209,8 @@ static void calculate_flow_sizes(struct ethtool_rx_flow_spec *fs, > ++(*num_hdrs); > if (has_ipv4(fs->flow_type)) > size += sizeof(struct iphdr); > - > + else if (has_ipv6(fs->flow_type)) > + size += sizeof(struct ipv6hdr); > done: > *key_size = size; > /* > @@ -7187,18 +7247,31 @@ static int setup_ip_key_mask(struct virtio_net_ff_selector *selector, > u8 *key, > const struct ethtool_rx_flow_spec *fs) > { > + struct ipv6hdr *v6_m = (struct ipv6hdr *)&selector->mask; > struct iphdr *v4_m = (struct iphdr *)&selector->mask; > + struct ipv6hdr *v6_k = (struct ipv6hdr *)key; > struct iphdr *v4_k = (struct iphdr *)key; > > - selector->type = VIRTIO_NET_FF_MASK_TYPE_IPV4; > - selector->length = sizeof(struct iphdr); > + if (has_ipv6(fs->flow_type)) { > + selector->type = VIRTIO_NET_FF_MASK_TYPE_IPV6; > + selector->length = sizeof(struct ipv6hdr); > > - if (fs->h_u.usr_ip4_spec.l4_4_bytes || > - fs->h_u.usr_ip4_spec.tos || > - fs->h_u.usr_ip4_spec.ip_ver != ETH_RX_NFC_IP4) > - return -EOPNOTSUPP; > + if (fs->h_u.usr_ip6_spec.l4_4_bytes || > + fs->h_u.usr_ip6_spec.tclass) > + return -EOPNOTSUPP; > > - parse_ip4(v4_m, v4_k, fs); > + parse_ip6(v6_m, v6_k, fs); > + } else { > + selector->type = VIRTIO_NET_FF_MASK_TYPE_IPV4; > + selector->length = sizeof(struct iphdr); > + > + if (fs->h_u.usr_ip4_spec.l4_4_bytes || > + fs->h_u.usr_ip4_spec.tos || > + fs->h_u.usr_ip4_spec.ip_ver != ETH_RX_NFC_IP4) > + return -EOPNOTSUPP; > + > + parse_ip4(v4_m, v4_k, fs); > + } > > return 0; > } > -- > 2.50.1