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Message-ID: <CACGkMEvNPzVkD8RQ84bU0yTSJeVNiq63jYbxCKhLQLpMPd0tZA@mail.gmail.com>
Date: Tue, 4 Nov 2025 12:35:50 +0800
From: Jason Wang <jasowang@...hat.com>
To: Daniel Jurgens <danielj@...dia.com>
Cc: netdev@...r.kernel.org, mst@...hat.com, alex.williamson@...hat.com,
pabeni@...hat.com, virtualization@...ts.linux.dev, parav@...dia.com,
shshitrit@...dia.com, yohadt@...dia.com, xuanzhuo@...ux.alibaba.com,
eperezma@...hat.com, shameerali.kolothum.thodi@...wei.com, jgg@...pe.ca,
kevin.tian@...el.com, kuba@...nel.org, andrew+netdev@...n.ch,
edumazet@...gle.com
Subject: Re: [PATCH net-next v7 09/12] virtio_net: Implement IPv4 ethtool flow rules
On Tue, Nov 4, 2025 at 6:56 AM Daniel Jurgens <danielj@...dia.com> wrote:
>
> Add support for IP_USER type rules from ethtool.
>
> Example:
> $ ethtool -U ens9 flow-type ip4 src-ip 192.168.51.101 action -1
> Added rule with ID 1
>
> The example rule will drop packets with the source IP specified.
>
> Signed-off-by: Daniel Jurgens <danielj@...dia.com>
> Reviewed-by: Parav Pandit <parav@...dia.com>
> Reviewed-by: Shahar Shitrit <shshitrit@...dia.com>
> Reviewed-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
> ---
> v4:
> - Fixed bug in protocol check of parse_ip4
> - (u8 *) to (void *) casting.
> - Alignment issues.
> ---
> drivers/net/virtio_net.c | 122 ++++++++++++++++++++++++++++++++++++---
> 1 file changed, 115 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index a0e94771a39e..865a27165365 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -6889,6 +6889,34 @@ static bool validate_eth_mask(const struct virtnet_ff *ff,
> return true;
> }
>
> +static bool validate_ip4_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 iphdr *cap, *mask;
> +
> + cap = (struct iphdr *)&sel_cap->mask;
> + mask = (struct iphdr *)&sel->mask;
> +
> + if (mask->saddr &&
> + !check_mask_vs_cap(&mask->saddr, &cap->saddr,
> + sizeof(__be32), partial_mask))
> + return false;
> +
> + if (mask->daddr &&
> + !check_mask_vs_cap(&mask->daddr, &cap->daddr,
> + sizeof(__be32), partial_mask))
> + return false;
> +
> + if (mask->protocol &&
> + !check_mask_vs_cap(&mask->protocol, &cap->protocol,
> + sizeof(u8), partial_mask))
> + return false;
> +
> + return true;
> +}
> +
> static bool validate_mask(const struct virtnet_ff *ff,
> const struct virtio_net_ff_selector *sel)
> {
> @@ -6900,11 +6928,36 @@ static bool validate_mask(const struct virtnet_ff *ff,
> switch (sel->type) {
> case VIRTIO_NET_FF_MASK_TYPE_ETH:
> return validate_eth_mask(ff, sel, sel_cap);
> +
> + case VIRTIO_NET_FF_MASK_TYPE_IPV4:
> + return validate_ip4_mask(ff, sel, sel_cap);
> }
>
> return false;
> }
>
> +static void parse_ip4(struct iphdr *mask, struct iphdr *key,
> + const struct ethtool_rx_flow_spec *fs)
> +{
> + const struct ethtool_usrip4_spec *l3_mask = &fs->m_u.usr_ip4_spec;
> + const struct ethtool_usrip4_spec *l3_val = &fs->h_u.usr_ip4_spec;
> +
> + mask->saddr = l3_mask->ip4src;
> + mask->daddr = l3_mask->ip4dst;
> + key->saddr = l3_val->ip4src;
> + key->daddr = l3_val->ip4dst;
> +
> + if (l3_mask->proto) {
> + mask->protocol = l3_mask->proto;
> + key->protocol = l3_val->proto;
> + }
> +}
> +
> +static bool has_ipv4(u32 flow_type)
> +{
> + return flow_type == IP_USER_FLOW;
> +}
> +
> static int setup_classifier(struct virtnet_ff *ff,
> struct virtnet_classifier **c)
> {
> @@ -7039,6 +7092,7 @@ static bool supported_flow_type(const struct ethtool_rx_flow_spec *fs)
> {
> switch (fs->flow_type) {
> case ETHER_FLOW:
> + case IP_USER_FLOW:
> return true;
> }
>
> @@ -7067,11 +7121,23 @@ static int validate_flow_input(struct virtnet_ff *ff,
> }
>
> static void calculate_flow_sizes(struct ethtool_rx_flow_spec *fs,
> - size_t *key_size, size_t *classifier_size,
> - int *num_hdrs)
> + size_t *key_size, size_t *classifier_size,
> + int *num_hdrs)
> {
> + size_t size = sizeof(struct ethhdr);
> +
> *num_hdrs = 1;
> *key_size = sizeof(struct ethhdr);
> +
> + if (fs->flow_type == ETHER_FLOW)
> + goto done;
> +
> + ++(*num_hdrs);
> + if (has_ipv4(fs->flow_type))
> + size += sizeof(struct iphdr);
> +
> +done:
> + *key_size = size;
> /*
> * 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
> @@ -7083,8 +7149,9 @@ static void calculate_flow_sizes(struct ethtool_rx_flow_spec *fs,
> }
>
> static void setup_eth_hdr_key_mask(struct virtio_net_ff_selector *selector,
> - u8 *key,
> - const struct ethtool_rx_flow_spec *fs)
> + u8 *key,
> + const struct ethtool_rx_flow_spec *fs,
> + int num_hdrs)
> {
> struct ethhdr *eth_m = (struct ethhdr *)&selector->mask;
> struct ethhdr *eth_k = (struct ethhdr *)key;
> @@ -7092,8 +7159,33 @@ static void setup_eth_hdr_key_mask(struct virtio_net_ff_selector *selector,
> 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));
> + if (num_hdrs > 1) {
> + eth_m->h_proto = cpu_to_be16(0xffff);
> + eth_k->h_proto = cpu_to_be16(ETH_P_IP);
Do we need to check IPV6 here?
Thanks
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