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Date: Tue, 12 Apr 2022 21:24:16 +0300
From: Nikolay Aleksandrov <razor@...ckwall.org>
To: Joachim Wiberg <troglobit@...il.com>,
Roopa Prabhu <roopa@...dia.com>
Cc: netdev@...r.kernel.org, bridge@...ts.linux-foundation.org,
"David S . Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Tobias Waldekranz <tobias@...dekranz.com>,
Vladimir Oltean <vladimir.oltean@....com>
Subject: Re: [PATCH RFC net-next 04/13] net: bridge: netlink support for
controlling BUM flooding to bridge
On 11/04/2022 16:38, Joachim Wiberg wrote:
> This patch adds netlink support for controlling the new broadcast,
> unicast, and multicast flooding flags to the bridge itself.
>
> The messy part is in br_setport(), which re-indents a large block of
> code for the port settings. To reduce code duplication a few new
> variables have been added; new_flags and dev. The latter is used for
> the recently renamed br_switchdev_set_dev_flag(), which can now be used
> by underlying switching fabric drivers as another source of information
> when controlling flooding of unknown BUM traffic to the CPU port.
>
> Signed-off-by: Joachim Wiberg <troglobit@...il.com>
> ---
Absolutely not. This is just wrong on a few levels and way too hacky.
Please separate the bridge handling altogether and make it clean.
No need to integrate it with the port handling, also I think you've missed
a few things about bool options, more below...
For boolopts examples you can check BR_BOOLOPT_NO_LL_LEARN,
BR_BOOLOPT_MCAST_VLAN_SNOOPING and BR_BOOLOPT_MST_ENABLE.
> net/bridge/br_netlink.c | 160 ++++++++++++++++++++++++++++++----------
> 1 file changed, 123 insertions(+), 37 deletions(-)
>
> diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
> index 8f4297287b32..68bbf703b31a 100644
> --- a/net/bridge/br_netlink.c
> +++ b/net/bridge/br_netlink.c
> @@ -225,13 +225,29 @@ static inline size_t br_nlmsg_size(struct net_device *dev, u32 filter_mask)
> + nla_total_size(4); /* IFLA_BRPORT_BACKUP_PORT */
> }
>
> -static int br_port_fill_attrs(struct sk_buff *skb,
> +static int br_port_fill_attrs(struct sk_buff *skb, const struct net_bridge *br,
> const struct net_bridge_port *p)
> {
> - u8 mode = !!(p->flags & BR_HAIRPIN_MODE);
> struct net_bridge_port *backup_p;
> u64 timerval;
> + u8 mode;
>
> + if (!p) {
> + if (!br)
> + return -EINVAL;
> +
> + if (nla_put_u8(skb, IFLA_BRPORT_UNICAST_FLOOD,
> + br_opt_get(br, BROPT_UNICAST_FLOOD)) ||
> + nla_put_u8(skb, IFLA_BRPORT_MCAST_FLOOD,
> + br_opt_get(br, BROPT_MCAST_FLOOD)) ||
> + nla_put_u8(skb, IFLA_BRPORT_BCAST_FLOOD,
> + br_opt_get(br, BROPT_BCAST_FLOOD)))
> + return -EMSGSIZE;
No. Bool opts are already exposed through IFLA_BR_MULTI_BOOLOPT.
> +
> + return 0;
> + }
> +
> + mode = !!(p->flags & BR_HAIRPIN_MODE);
> if (nla_put_u8(skb, IFLA_BRPORT_STATE, p->state) ||
> nla_put_u16(skb, IFLA_BRPORT_PRIORITY, p->priority) ||
> nla_put_u32(skb, IFLA_BRPORT_COST, p->path_cost) ||
> @@ -475,11 +491,11 @@ static int br_fill_ifinfo(struct sk_buff *skb,
> nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
> goto nla_put_failure;
>
> - if (event == RTM_NEWLINK && port) {
> + if (event == RTM_NEWLINK) {
> struct nlattr *nest;
>
> nest = nla_nest_start(skb, IFLA_PROTINFO);
> - if (nest == NULL || br_port_fill_attrs(skb, port) < 0)
> + if (!nest || br_port_fill_attrs(skb, br, port) < 0)
> goto nla_put_failure;
> nla_nest_end(skb, nest);
> }
> @@ -911,43 +927,113 @@ static void br_set_port_flag(struct net_bridge_port *p, struct nlattr *tb[],
> p->flags &= ~mask;
> }
>
> +/* Map bridge options to brport flags */
> +static unsigned long br_boolopt_map_flags(struct br_boolopt_multi *bm)
> +{
> + unsigned long bitmap = bm->optmask;
> + unsigned long bitmask = 0;
> + int opt_id;
> +
> + for_each_set_bit(opt_id, &bitmap, BR_BOOLOPT_MAX) {
> + if (!(bm->optval & BIT(opt_id)))
> + continue;
> +
> + switch (opt_id) {
> + case BROPT_UNICAST_FLOOD:
> + bitmask |= BR_FLOOD;
> + break;
> + case BROPT_MCAST_FLOOD:
> + bitmask |= BR_MCAST_FLOOD;
> + break;
> + case BROPT_BCAST_FLOOD:
> + bitmask |= BR_BCAST_FLOOD;
> + break;
> + }
> + }
> +
> + return bitmask;
> +}
> +
> +static void br_set_bropt(struct net_bridge *br, struct nlattr *tb[],
> + int attrtype, enum net_bridge_opts opt)
> +{
> + if (!tb[attrtype])
> + return;
> +
> + br_opt_toggle(br, opt, !!nla_get_u8(tb[attrtype]));
> +}
These must be controlled via the boolopt api and attributes, not through
additional nl attributes.
> +
> +#define BROPT_MASK (BROPT_UNICAST_FLOOD | BROPT_MCAST_FLOOD | BROPT_MCAST_FLOOD)
> +
> /* Process bridge protocol info on port */
> -static int br_setport(struct net_bridge_port *p, struct nlattr *tb[],
> - struct netlink_ext_ack *extack)
> +static int br_setport(struct net_bridge *br, struct net_bridge_port *p,
> + struct nlattr *tb[], struct netlink_ext_ack *extack)
> {
> - unsigned long old_flags, changed_mask;
> + unsigned long old_flags, new_flags, changed_mask;
> + struct br_boolopt_multi old_opts = {
> + .optmask = BROPT_MASK
> + };
> bool br_vlan_tunnel_old;
> + struct net_device *dev;
> int err;
>
> - old_flags = p->flags;
> - br_vlan_tunnel_old = (old_flags & BR_VLAN_TUNNEL) ? true : false;
> -
> - br_set_port_flag(p, tb, IFLA_BRPORT_MODE, BR_HAIRPIN_MODE);
> - br_set_port_flag(p, tb, IFLA_BRPORT_GUARD, BR_BPDU_GUARD);
> - br_set_port_flag(p, tb, IFLA_BRPORT_FAST_LEAVE,
> - BR_MULTICAST_FAST_LEAVE);
> - br_set_port_flag(p, tb, IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK);
> - br_set_port_flag(p, tb, IFLA_BRPORT_LEARNING, BR_LEARNING);
> - br_set_port_flag(p, tb, IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD);
> - br_set_port_flag(p, tb, IFLA_BRPORT_MCAST_FLOOD, BR_MCAST_FLOOD);
> - br_set_port_flag(p, tb, IFLA_BRPORT_MCAST_TO_UCAST,
> - BR_MULTICAST_TO_UNICAST);
> - br_set_port_flag(p, tb, IFLA_BRPORT_BCAST_FLOOD, BR_BCAST_FLOOD);
> - br_set_port_flag(p, tb, IFLA_BRPORT_PROXYARP, BR_PROXYARP);
> - br_set_port_flag(p, tb, IFLA_BRPORT_PROXYARP_WIFI, BR_PROXYARP_WIFI);
> - br_set_port_flag(p, tb, IFLA_BRPORT_VLAN_TUNNEL, BR_VLAN_TUNNEL);
> - br_set_port_flag(p, tb, IFLA_BRPORT_NEIGH_SUPPRESS, BR_NEIGH_SUPPRESS);
> - br_set_port_flag(p, tb, IFLA_BRPORT_ISOLATED, BR_ISOLATED);
> - br_set_port_flag(p, tb, IFLA_BRPORT_LOCKED, BR_PORT_LOCKED);
> -
> - changed_mask = old_flags ^ p->flags;
> -
> - err = br_switchdev_set_dev_flag(p->dev, p->flags, changed_mask, extack);
> + if (p) {
> + old_flags = p->flags;
> + br_vlan_tunnel_old = (old_flags & BR_VLAN_TUNNEL) ? true : false;
> +
> + br_set_port_flag(p, tb, IFLA_BRPORT_MODE, BR_HAIRPIN_MODE);
> + br_set_port_flag(p, tb, IFLA_BRPORT_GUARD, BR_BPDU_GUARD);
> + br_set_port_flag(p, tb, IFLA_BRPORT_FAST_LEAVE,
> + BR_MULTICAST_FAST_LEAVE);
> + br_set_port_flag(p, tb, IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK);
> + br_set_port_flag(p, tb, IFLA_BRPORT_LEARNING, BR_LEARNING);
> + br_set_port_flag(p, tb, IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD);
> + br_set_port_flag(p, tb, IFLA_BRPORT_MCAST_FLOOD, BR_MCAST_FLOOD);
> + br_set_port_flag(p, tb, IFLA_BRPORT_MCAST_TO_UCAST,
> + BR_MULTICAST_TO_UNICAST);
> + br_set_port_flag(p, tb, IFLA_BRPORT_BCAST_FLOOD, BR_BCAST_FLOOD);
> + br_set_port_flag(p, tb, IFLA_BRPORT_PROXYARP, BR_PROXYARP);
> + br_set_port_flag(p, tb, IFLA_BRPORT_PROXYARP_WIFI, BR_PROXYARP_WIFI);
> + br_set_port_flag(p, tb, IFLA_BRPORT_VLAN_TUNNEL, BR_VLAN_TUNNEL);
> + br_set_port_flag(p, tb, IFLA_BRPORT_NEIGH_SUPPRESS, BR_NEIGH_SUPPRESS);
> + br_set_port_flag(p, tb, IFLA_BRPORT_ISOLATED, BR_ISOLATED);
> + br_set_port_flag(p, tb, IFLA_BRPORT_LOCKED, BR_PORT_LOCKED);
> +
> + new_flags = p->flags;
> + dev = p->dev;
> + } else {
> + struct br_boolopt_multi opts = {
> + .optmask = BROPT_MASK
> + };
> +
> + br_boolopt_multi_get(br, &old_opts);
> + old_flags = br_boolopt_map_flags(&old_opts);
> +
> + br_set_bropt(br, tb, IFLA_BRPORT_UNICAST_FLOOD, BROPT_UNICAST_FLOOD);
> + br_set_bropt(br, tb, IFLA_BRPORT_MCAST_FLOOD, BROPT_MCAST_FLOOD);
> + br_set_bropt(br, tb, IFLA_BRPORT_BCAST_FLOOD, BROPT_BCAST_FLOOD);
> +
> + br_boolopt_multi_get(br, &opts);
> + new_flags = br_boolopt_map_flags(&opts);
> + dev = br->dev;
> + }
> +
> + changed_mask = old_flags ^ new_flags;
> +
> + err = br_switchdev_set_dev_flag(dev, new_flags, changed_mask, extack);
> if (err) {
> - p->flags = old_flags;
> + if (!p)
> + br_boolopt_multi_toggle(br, &old_opts, extack);
> + else
> + p->flags = old_flags;
> +
> return err;
> }
>
> + /* Skip the rest for the bridge itself, for now */
> + if (!p)
> + return 0;
> +
> if (br_vlan_tunnel_old && !(p->flags & BR_VLAN_TUNNEL))
> nbp_vlan_tunnel_info_flush(p);
>
> @@ -1048,7 +1134,7 @@ int br_setlink(struct net_device *dev, struct nlmsghdr *nlh, u16 flags,
> if (!p && !afspec)
> return -EINVAL;
>
> - if (p && protinfo) {
> + if (protinfo) {
> if (protinfo->nla_type & NLA_F_NESTED) {
> err = nla_parse_nested_deprecated(tb, IFLA_BRPORT_MAX,
> protinfo,
> @@ -1058,9 +1144,9 @@ int br_setlink(struct net_device *dev, struct nlmsghdr *nlh, u16 flags,
> return err;
>
> spin_lock_bh(&br->lock);
> - err = br_setport(p, tb, extack);
> + err = br_setport(br, p, tb, extack);
setport is for *port* only...
> spin_unlock_bh(&br->lock);
> - } else {
> + } else if (p) {
> /* Binary compatibility with old RSTP */
> if (nla_len(protinfo) < sizeof(u8))
> return -EINVAL;
> @@ -1153,7 +1239,7 @@ static int br_port_slave_changelink(struct net_device *brdev,
> return 0;
>
> spin_lock_bh(&br->lock);
> - ret = br_setport(br_port_get_rtnl(dev), data, extack);
> + ret = br_setport(br, br_port_get_rtnl(dev), data, extack);
> spin_unlock_bh(&br->lock);
>
> return ret;
> @@ -1163,7 +1249,7 @@ static int br_port_fill_slave_info(struct sk_buff *skb,
> const struct net_device *brdev,
> const struct net_device *dev)
> {
> - return br_port_fill_attrs(skb, br_port_get_rtnl(dev));
> + return br_port_fill_attrs(skb, NULL, br_port_get_rtnl(dev));
> }
>
> static size_t br_port_get_slave_size(const struct net_device *brdev,
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