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[80.230.39.63]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-477a9e1b657sm22104535e9.17.2025.11.18.11.01.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 18 Nov 2025 11:01:26 -0800 (PST) Date: Tue, 18 Nov 2025 14:01:23 -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 07/12] virtio_net: Implement layer 2 ethtool flow rules Message-ID: <20251118135634-mutt-send-email-mst@kernel.org> References: <20251118143903.958844-1-danielj@nvidia.com> <20251118143903.958844-8-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: <20251118143903.958844-8-danielj@nvidia.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: mKJmrE_JXL7j5X4i44ygkNaQNvhVz0mlvaq6Gvypnao_1763492488 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Tue, Nov 18, 2025 at 08:38:57AM -0600, Daniel Jurgens wrote: > Filtering a flow requires a classifier to match the packets, and a rule > to filter on the matches. > > A classifier consists of one or more selectors. There is one selector > per header type. A selector must only use fields set in the selector > capability. If partial matching is supported, the classifier mask for a > particular field can be a subset of the mask for that field in the > capability. > > The rule consists of a priority, an action and a key. The key is a byte > array containing headers corresponding to the selectors in the > classifier. > > This patch implements ethtool rules for ethernet headers. > > Example: > $ ethtool -U ens9 flow-type ether dst 08:11:22:33:44:54 action 30 > Added rule with ID 1 > > The rule in the example directs received packets with the specified > destination MAC address to rq 30. > > Signed-off-by: Daniel Jurgens > Reviewed-by: Parav Pandit > Reviewed-by: Shahar Shitrit > Reviewed-by: Xuan Zhuo > --- > v4: > - Fixed double free bug in error flows > - Build bug on for classifier struct ordering. > - (u8 *) to (void *) casting. > - Documentation in UAPI > - Answered questions about overflow with no changes. > v6: > - Fix sparse warning "array of flexible structures" Jakub K/Simon H > v7: > - Move for (int i -> for (i hunk from next patch. Paolo Abeni > --- > drivers/net/virtio_net.c | 462 +++++++++++++++++++++++++++++ > include/uapi/linux/virtio_net_ff.h | 50 ++++ > 2 files changed, 512 insertions(+) > > diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c > index 900d597726f7..de1a23c71449 100644 > --- a/drivers/net/virtio_net.c > +++ b/drivers/net/virtio_net.c > @@ -284,6 +284,11 @@ static const struct virtnet_stat_desc virtnet_stats_tx_speed_desc_qstat[] = { > VIRTNET_STATS_DESC_TX_QSTAT(speed, ratelimit_packets, hw_drop_ratelimits), > }; > > +struct virtnet_ethtool_ff { > + struct xarray rules; > + int num_rules; > +}; > + > #define VIRTNET_FF_ETHTOOL_GROUP_PRIORITY 1 > #define VIRTNET_FF_MAX_GROUPS 1 > > @@ -293,8 +298,16 @@ struct virtnet_ff { > struct virtio_net_ff_cap_data *ff_caps; > struct virtio_net_ff_cap_mask_data *ff_mask; > struct virtio_net_ff_actions *ff_actions; > + struct xarray classifiers; > + int num_classifiers; > + struct virtnet_ethtool_ff ethtool; > }; > > +static int virtnet_ethtool_flow_insert(struct virtnet_ff *ff, > + struct ethtool_rx_flow_spec *fs, > + u16 curr_queue_pairs); > +static int virtnet_ethtool_flow_remove(struct virtnet_ff *ff, int location); > + > #define VIRTNET_Q_TYPE_RX 0 > #define VIRTNET_Q_TYPE_TX 1 > #define VIRTNET_Q_TYPE_CQ 2 > @@ -5653,6 +5666,21 @@ static u32 virtnet_get_rx_ring_count(struct net_device *dev) > return vi->curr_queue_pairs; > } > > +static int virtnet_set_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info) > +{ > + struct virtnet_info *vi = netdev_priv(dev); > + > + switch (info->cmd) { > + case ETHTOOL_SRXCLSRLINS: > + return virtnet_ethtool_flow_insert(&vi->ff, &info->fs, > + vi->curr_queue_pairs); > + case ETHTOOL_SRXCLSRLDEL: > + return virtnet_ethtool_flow_remove(&vi->ff, info->fs.location); > + } > + > + return -EOPNOTSUPP; > +} > + > static const struct ethtool_ops virtnet_ethtool_ops = { > .supported_coalesce_params = ETHTOOL_COALESCE_MAX_FRAMES | > ETHTOOL_COALESCE_USECS | ETHTOOL_COALESCE_USE_ADAPTIVE_RX, > @@ -5679,6 +5707,7 @@ static const struct ethtool_ops virtnet_ethtool_ops = { > .get_rxfh_fields = virtnet_get_hashflow, > .set_rxfh_fields = virtnet_set_hashflow, > .get_rx_ring_count = virtnet_get_rx_ring_count, > + .set_rxnfc = virtnet_set_rxnfc, > }; > > static void virtnet_get_queue_stats_rx(struct net_device *dev, int i, > @@ -6790,6 +6819,428 @@ static const struct xdp_metadata_ops virtnet_xdp_metadata_ops = { > .xmo_rx_hash = virtnet_xdp_rx_hash, > }; > > +struct virtnet_ethtool_rule { > + struct ethtool_rx_flow_spec flow_spec; > + u32 classifier_id; > +}; > + > +/* The classifier struct must be the last field in this struct */ > +struct virtnet_classifier { > + size_t size; > + u32 id; > + struct virtio_net_resource_obj_ff_classifier classifier; > +}; > + > +static_assert(sizeof(struct virtnet_classifier) == > + ALIGN(offsetofend(struct virtnet_classifier, classifier), > + __alignof__(struct virtnet_classifier)), > + "virtnet_classifier: classifier must be the last member"); > + > +static bool check_mask_vs_cap(const void *m, const void *c, > + u16 len, bool partial) > +{ > + const u8 *mask = m; > + const u8 *cap = c; > + int i; > + > + for (i = 0; i < len; i++) { > + if (partial && ((mask[i] & cap[i]) != mask[i])) > + return false; > + if (!partial && mask[i] != cap[i]) > + return false; > + } > + > + return true; > +} > + > +static > +struct virtio_net_ff_selector *get_selector_cap(const struct virtnet_ff *ff, > + u8 selector_type) > +{ > + struct virtio_net_ff_selector *sel; > + void *buf; > + int i; > + > + buf = &ff->ff_mask->selectors; > + sel = buf; > + > + for (i = 0; i < ff->ff_mask->count; i++) { > + if (sel->type == selector_type) > + return sel; > + > + buf += sizeof(struct virtio_net_ff_selector) + sel->length; > + sel = buf; > + } > + > + return NULL; > +} > + > +static bool validate_eth_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 ethhdr *cap, *mask; > + struct ethhdr zeros = {}; > + > + cap = (struct ethhdr *)&sel_cap->mask; > + mask = (struct ethhdr *)&sel->mask; > + > + if (memcmp(&zeros.h_dest, mask->h_dest, sizeof(zeros.h_dest)) && > + !check_mask_vs_cap(mask->h_dest, cap->h_dest, > + sizeof(mask->h_dest), partial_mask)) > + return false; > + > + if (memcmp(&zeros.h_source, mask->h_source, sizeof(zeros.h_source)) && > + !check_mask_vs_cap(mask->h_source, cap->h_source, > + sizeof(mask->h_source), partial_mask)) > + return false; > + > + if (mask->h_proto && > + !check_mask_vs_cap(&mask->h_proto, &cap->h_proto, > + sizeof(__be16), partial_mask)) > + return false; > + > + return true; > +} > + > +static bool validate_mask(const struct virtnet_ff *ff, > + const struct virtio_net_ff_selector *sel) > +{ > + struct virtio_net_ff_selector *sel_cap = get_selector_cap(ff, sel->type); > + > + if (!sel_cap) > + return false; > + > + switch (sel->type) { > + case VIRTIO_NET_FF_MASK_TYPE_ETH: > + return validate_eth_mask(ff, sel, sel_cap); > + } > + > + return false; > +} > + > +static int setup_classifier(struct virtnet_ff *ff, struct virtnet_classifier *c) > +{ > + int err; > + > + err = xa_alloc(&ff->classifiers, &c->id, c, > + XA_LIMIT(0, le32_to_cpu(ff->ff_caps->classifiers_limit) - 1), > + GFP_KERNEL); > + if (err) > + return err; > + > + err = virtio_admin_obj_create(ff->vdev, > + VIRTIO_NET_RESOURCE_OBJ_FF_CLASSIFIER, > + c->id, > + VIRTIO_ADMIN_GROUP_TYPE_SELF, > + 0, > + &c->classifier, > + c->size); > + if (err) > + goto err_xarray; > + > + return 0; > + > +err_xarray: > + xa_erase(&ff->classifiers, c->id); > + > + return err; > +} > + > +static void destroy_classifier(struct virtnet_ff *ff, > + u32 classifier_id) > +{ > + struct virtnet_classifier *c; > + > + c = xa_load(&ff->classifiers, classifier_id); > + if (c) { > + virtio_admin_obj_destroy(ff->vdev, > + VIRTIO_NET_RESOURCE_OBJ_FF_CLASSIFIER, > + c->id, > + VIRTIO_ADMIN_GROUP_TYPE_SELF, > + 0); > + > + xa_erase(&ff->classifiers, c->id); > + kfree(c); > + } > +} > + > +static void destroy_ethtool_rule(struct virtnet_ff *ff, > + struct virtnet_ethtool_rule *eth_rule) > +{ > + ff->ethtool.num_rules--; > + > + virtio_admin_obj_destroy(ff->vdev, > + VIRTIO_NET_RESOURCE_OBJ_FF_RULE, > + eth_rule->flow_spec.location, > + VIRTIO_ADMIN_GROUP_TYPE_SELF, > + 0); > + > + xa_erase(&ff->ethtool.rules, eth_rule->flow_spec.location); > + destroy_classifier(ff, eth_rule->classifier_id); > + kfree(eth_rule); > +} > + > +static int insert_rule(struct virtnet_ff *ff, > + struct virtnet_ethtool_rule *eth_rule, > + u32 classifier_id, > + const u8 *key, > + size_t key_size) > +{ > + struct ethtool_rx_flow_spec *fs = ð_rule->flow_spec; > + struct virtio_net_resource_obj_ff_rule *ff_rule; > + int err; > + > + ff_rule = kzalloc(sizeof(*ff_rule) + key_size, GFP_KERNEL); > + if (!ff_rule) > + return -ENOMEM; > + > + /* Intentionally leave the priority as 0. All rules have the same > + * priority. > + */ > + ff_rule->group_id = cpu_to_le32(VIRTNET_FF_ETHTOOL_GROUP_PRIORITY); > + ff_rule->classifier_id = cpu_to_le32(classifier_id); > + ff_rule->key_length = (u8)key_size; I don't think you need this cast. BTW why do you insist on making all this math in size_t variables? Just u8 should do, and in calculate_flow_sizes you can do a BUG_ON to check it does not overflow. > + ff_rule->action = fs->ring_cookie == RX_CLS_FLOW_DISC ? > + VIRTIO_NET_FF_ACTION_DROP : > + VIRTIO_NET_FF_ACTION_RX_VQ; > + ff_rule->vq_index = fs->ring_cookie != RX_CLS_FLOW_DISC ? > + cpu_to_le16(fs->ring_cookie) : 0; > + memcpy(&ff_rule->keys, key, key_size); > + > + err = virtio_admin_obj_create(ff->vdev, > + VIRTIO_NET_RESOURCE_OBJ_FF_RULE, > + fs->location, > + VIRTIO_ADMIN_GROUP_TYPE_SELF, > + 0, > + ff_rule, > + sizeof(*ff_rule) + key_size); > + if (err) > + goto err_ff_rule; > + > + eth_rule->classifier_id = classifier_id; > + ff->ethtool.num_rules++; > + kfree(ff_rule); > + > + return 0; > + > +err_ff_rule: > + kfree(ff_rule); > + > + return err; > +} > + > +static u32 flow_type_mask(u32 flow_type) > +{ > + return flow_type & ~(FLOW_EXT | FLOW_MAC_EXT | FLOW_RSS); > +} > + > +static bool supported_flow_type(const struct ethtool_rx_flow_spec *fs) > +{ > + switch (fs->flow_type) { > + case ETHER_FLOW: > + return true; > + } > + > + return false; > +} > + > +static int validate_flow_input(struct virtnet_ff *ff, > + const struct ethtool_rx_flow_spec *fs, > + u16 curr_queue_pairs) > +{ > + /* Force users to use RX_CLS_LOC_ANY - don't allow specific locations */ > + if (fs->location != RX_CLS_LOC_ANY) > + return -EOPNOTSUPP; > + > + if (fs->ring_cookie != RX_CLS_FLOW_DISC && > + fs->ring_cookie >= curr_queue_pairs) > + return -EINVAL; > + > + if (fs->flow_type != flow_type_mask(fs->flow_type)) > + return -EOPNOTSUPP; > + > + if (!supported_flow_type(fs)) > + return -EOPNOTSUPP; > + > + return 0; > +} > + > +static void calculate_flow_sizes(struct ethtool_rx_flow_spec *fs, > + size_t *key_size, size_t *classifier_size, > + int *num_hdrs) > +{ > + *num_hdrs = 1; > + *key_size = sizeof(struct ethhdr); > + /* > + * The classifier size is the size of the classifier header, a selector > + * header for each type of header in the match criteria, and each header > + * providing the mask for matching against. > + */ > + *classifier_size = *key_size + > + sizeof(struct virtio_net_resource_obj_ff_classifier) + > + sizeof(struct virtio_net_ff_selector) * (*num_hdrs); > +} > + > +static void setup_eth_hdr_key_mask(struct virtio_net_ff_selector *selector, > + u8 *key, > + const struct ethtool_rx_flow_spec *fs) > +{ > + struct ethhdr *eth_m = (struct ethhdr *)&selector->mask; > + struct ethhdr *eth_k = (struct ethhdr *)key; > + > + selector->type = VIRTIO_NET_FF_MASK_TYPE_ETH; > + selector->length = sizeof(struct ethhdr); > + > + memcpy(eth_m, &fs->m_u.ether_spec, sizeof(*eth_m)); > + memcpy(eth_k, &fs->h_u.ether_spec, sizeof(*eth_k)); > +} > + > +static int > +validate_classifier_selectors(struct virtnet_ff *ff, > + struct virtio_net_resource_obj_ff_classifier *classifier, > + int num_hdrs) > +{ > + struct virtio_net_ff_selector *selector = (void *)classifier->selectors; > + int i; > + > + for (i = 0; i < num_hdrs; i++) { > + if (!validate_mask(ff, selector)) > + return -EINVAL; > + > + selector = (((void *)selector) + sizeof(*selector) + > + selector->length); > + } > + > + return 0; > +} > + > +static int build_and_insert(struct virtnet_ff *ff, > + struct virtnet_ethtool_rule *eth_rule) > +{ > + struct virtio_net_resource_obj_ff_classifier *classifier; > + struct ethtool_rx_flow_spec *fs = ð_rule->flow_spec; > + struct virtio_net_ff_selector *selector; > + struct virtnet_classifier *c; > + size_t classifier_size; > + size_t key_size; > + int num_hdrs; > + u8 *key; > + int err; > + > + calculate_flow_sizes(fs, &key_size, &classifier_size, &num_hdrs); > + > + key = kzalloc(key_size, GFP_KERNEL); > + if (!key) > + return -ENOMEM; > + > + /* > + * virtio_net_ff_obj_ff_classifier is already included in the > + * classifier_size. > + */ > + c = kzalloc(classifier_size + > + sizeof(struct virtnet_classifier) - > + sizeof(struct virtio_net_resource_obj_ff_classifier), > + GFP_KERNEL); > + if (!c) { > + kfree(key); > + return -ENOMEM; > + } > + > + c->size = classifier_size; > + classifier = &c->classifier; > + classifier->count = num_hdrs; > + selector = (void *)&classifier->selectors[0]; > + > + setup_eth_hdr_key_mask(selector, key, fs); > + > + err = validate_classifier_selectors(ff, classifier, num_hdrs); > + if (err) > + goto err_key; > + > + err = setup_classifier(ff, c); > + if (err) > + goto err_classifier; > + > + err = insert_rule(ff, eth_rule, c->id, key, key_size); > + if (err) { > + /* destroy_classifier will free the classifier */ > + destroy_classifier(ff, c->id); > + goto err_key; > + } > + > + return 0; > + > +err_classifier: > + kfree(c); > +err_key: > + kfree(key); > + > + return err; > +} > + > +static int virtnet_ethtool_flow_insert(struct virtnet_ff *ff, > + struct ethtool_rx_flow_spec *fs, > + u16 curr_queue_pairs) > +{ > + struct virtnet_ethtool_rule *eth_rule; > + int err; > + > + if (!ff->ff_supported) > + return -EOPNOTSUPP; > + > + err = validate_flow_input(ff, fs, curr_queue_pairs); > + if (err) > + return err; > + > + eth_rule = kzalloc(sizeof(*eth_rule), GFP_KERNEL); > + if (!eth_rule) > + return -ENOMEM; > + > + err = xa_alloc(&ff->ethtool.rules, &fs->location, eth_rule, > + XA_LIMIT(0, le32_to_cpu(ff->ff_caps->rules_limit) - 1), > + GFP_KERNEL); > + if (err) > + goto err_rule; > + > + eth_rule->flow_spec = *fs; > + > + err = build_and_insert(ff, eth_rule); > + if (err) > + goto err_xa; > + > + return err; > + > +err_xa: > + xa_erase(&ff->ethtool.rules, eth_rule->flow_spec.location); > + > +err_rule: > + fs->location = RX_CLS_LOC_ANY; > + kfree(eth_rule); > + > + return err; > +} > + > +static int virtnet_ethtool_flow_remove(struct virtnet_ff *ff, int location) > +{ > + struct virtnet_ethtool_rule *eth_rule; > + int err = 0; > + > + if (!ff->ff_supported) > + return -EOPNOTSUPP; > + > + eth_rule = xa_load(&ff->ethtool.rules, location); > + if (!eth_rule) { > + err = -ENOENT; > + goto out; > + } > + > + destroy_ethtool_rule(ff, eth_rule); > +out: > + return err; > +} > + > static size_t get_mask_size(u16 type) > { > switch (type) { > @@ -6955,6 +7406,8 @@ static int virtnet_ff_init(struct virtnet_ff *ff, struct virtio_device *vdev) > if (err) > goto err_ff_action; > > + xa_init_flags(&ff->classifiers, XA_FLAGS_ALLOC); > + xa_init_flags(&ff->ethtool.rules, XA_FLAGS_ALLOC); > ff->vdev = vdev; > ff->ff_supported = true; > > @@ -6979,9 +7432,18 @@ static int virtnet_ff_init(struct virtnet_ff *ff, struct virtio_device *vdev) > > static void virtnet_ff_cleanup(struct virtnet_ff *ff) > { > + struct virtnet_ethtool_rule *eth_rule; > + unsigned long i; > + > if (!ff->ff_supported) > return; > > + xa_for_each(&ff->ethtool.rules, i, eth_rule) > + destroy_ethtool_rule(ff, eth_rule); > + > + xa_destroy(&ff->ethtool.rules); > + xa_destroy(&ff->classifiers); > + > virtio_admin_obj_destroy(ff->vdev, > VIRTIO_NET_RESOURCE_OBJ_FF_GROUP, > VIRTNET_FF_ETHTOOL_GROUP_PRIORITY, > diff --git a/include/uapi/linux/virtio_net_ff.h b/include/uapi/linux/virtio_net_ff.h > index 6d1f953c2b46..c98aa4942bee 100644 > --- a/include/uapi/linux/virtio_net_ff.h > +++ b/include/uapi/linux/virtio_net_ff.h > @@ -13,6 +13,8 @@ > #define VIRTIO_NET_FF_ACTION_CAP 0x802 > > #define VIRTIO_NET_RESOURCE_OBJ_FF_GROUP 0x0200 > +#define VIRTIO_NET_RESOURCE_OBJ_FF_CLASSIFIER 0x0201 > +#define VIRTIO_NET_RESOURCE_OBJ_FF_RULE 0x0202 > > /** > * struct virtio_net_ff_cap_data - Flow filter resource capability limits > @@ -103,4 +105,52 @@ struct virtio_net_resource_obj_ff_group { > __le16 group_priority; > }; > > +/** > + * struct virtio_net_resource_obj_ff_classifier - Flow filter classifier object > + * @count: number of selector entries in @selectors > + * @reserved: must be set to 0 by the driver and ignored by the device > + * @selectors: array of selector descriptors that define match masks > + * > + * Payload for the VIRTIO_NET_RESOURCE_OBJ_FF_CLASSIFIER administrative object. > + * Each selector describes a header mask used to match packets > + * (see struct virtio_net_ff_selector). Selectors appear in the order they are > + * to be applied. > + */ > +struct virtio_net_resource_obj_ff_classifier { > + __u8 count; > + __u8 reserved[7]; > + __u8 selectors[]; > +}; > + > +/** > + * struct virtio_net_resource_obj_ff_rule - Flow filter rule object > + * @group_id: identifier of the target flow filter group > + * @classifier_id: identifier of the classifier referenced by this rule > + * @rule_priority: relative priority of this rule within the group > + * @key_length: number of bytes in @keys > + * @action: action to perform, one of VIRTIO_NET_FF_ACTION_* > + * @reserved: must be set to 0 by the driver and ignored by the device > + * @vq_index: RX virtqueue index for VIRTIO_NET_FF_ACTION_RX_VQ, 0 otherwise > + * @reserved1: must be set to 0 by the driver and ignored by the device > + * @keys: concatenated key bytes matching the classifier's selectors order > + * > + * Payload for the VIRTIO_NET_RESOURCE_OBJ_FF_RULE administrative object. > + * @group_id and @classifier_id refer to previously created objects of types > + * VIRTIO_NET_RESOURCE_OBJ_FF_GROUP and VIRTIO_NET_RESOURCE_OBJ_FF_CLASSIFIER > + * respectively. The key bytes are compared against packet headers using the > + * masks provided by the classifier's selectors. Multi-byte fields are > + * little-endian. > + */ > +struct virtio_net_resource_obj_ff_rule { > + __le32 group_id; > + __le32 classifier_id; > + __u8 rule_priority; > + __u8 key_length; /* length of key in bytes */ > + __u8 action; > + __u8 reserved; > + __le16 vq_index; > + __u8 reserved1[2]; > + __u8 keys[]; > +}; > + > #endif > -- > 2.50.1