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Date: Mon, 14 Mar 2022 12:37:46 +0200
From: Nikolay Aleksandrov <razor@...ckwall.org>
To: Tobias Waldekranz <tobias@...dekranz.com>, davem@...emloft.net,
kuba@...nel.org
Cc: Andrew Lunn <andrew@...n.ch>,
Vivien Didelot <vivien.didelot@...il.com>,
Florian Fainelli <f.fainelli@...il.com>,
Vladimir Oltean <olteanv@...il.com>,
Jiri Pirko <jiri@...nulli.us>,
Ivan Vecera <ivecera@...hat.com>,
Roopa Prabhu <roopa@...dia.com>,
Russell King <linux@...linux.org.uk>,
Ido Schimmel <idosch@...dia.com>,
Petr Machata <petrm@...dia.com>,
Cooper Lees <me@...perlees.com>,
Matt Johnston <matt@...econstruct.com.au>,
linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
bridge@...ts.linux-foundation.org
Subject: Re: [PATCH v3 net-next 03/14] net: bridge: mst: Support setting and
reporting MST port states
On 14/03/2022 11:52, Tobias Waldekranz wrote:
> Make it possible to change the port state in a given MSTI by extending
> the bridge port netlink interface (RTM_SETLINK on PF_BRIDGE).The
> proposed iproute2 interface would be:
>
> bridge mst set dev <PORT> msti <MSTI> state <STATE>
>
> Current states in all applicable MSTIs can also be dumped via a
> corresponding RTM_GETLINK. The proposed iproute interface looks like
> this:
>
> $ bridge mst
> port msti
> vb1 0
> state forwarding
> 100
> state disabled
> vb2 0
> state forwarding
> 100
> state forwarding
>
> The preexisting per-VLAN states are still valid in the MST
> mode (although they are read-only), and can be queried as usual if one
> is interested in knowing a particular VLAN's state without having to
> care about the VID to MSTI mapping (in this example VLAN 20 and 30 are
> bound to MSTI 100):
>
> $ bridge -d vlan
> port vlan-id
> vb1 10
> state forwarding mcast_router 1
> 20
> state disabled mcast_router 1
> 30
> state disabled mcast_router 1
> 40
> state forwarding mcast_router 1
> vb2 10
> state forwarding mcast_router 1
> 20
> state forwarding mcast_router 1
> 30
> state forwarding mcast_router 1
> 40
> state forwarding mcast_router 1
>
> Signed-off-by: Tobias Waldekranz <tobias@...dekranz.com>
> ---
Hi Tobias,
A few comments below..
> include/uapi/linux/if_bridge.h | 17 ++++++
> include/uapi/linux/rtnetlink.h | 1 +
> net/bridge/br_mst.c | 105 +++++++++++++++++++++++++++++++++
> net/bridge/br_netlink.c | 32 +++++++++-
> net/bridge/br_private.h | 15 +++++
> 5 files changed, 169 insertions(+), 1 deletion(-)
>
> diff --git a/include/uapi/linux/if_bridge.h b/include/uapi/linux/if_bridge.h
> index f60244b747ae..879dfaef8da0 100644
> --- a/include/uapi/linux/if_bridge.h
> +++ b/include/uapi/linux/if_bridge.h
> @@ -122,6 +122,7 @@ enum {
> IFLA_BRIDGE_VLAN_TUNNEL_INFO,
> IFLA_BRIDGE_MRP,
> IFLA_BRIDGE_CFM,
> + IFLA_BRIDGE_MST,
> __IFLA_BRIDGE_MAX,
> };
> #define IFLA_BRIDGE_MAX (__IFLA_BRIDGE_MAX - 1)
> @@ -453,6 +454,21 @@ enum {
>
> #define IFLA_BRIDGE_CFM_CC_PEER_STATUS_MAX (__IFLA_BRIDGE_CFM_CC_PEER_STATUS_MAX - 1)
>
> +enum {
> + IFLA_BRIDGE_MST_UNSPEC,
> + IFLA_BRIDGE_MST_ENTRY,
> + __IFLA_BRIDGE_MST_MAX,
> +};
> +#define IFLA_BRIDGE_MST_MAX (__IFLA_BRIDGE_MST_MAX - 1)
> +
> +enum {
> + IFLA_BRIDGE_MST_ENTRY_UNSPEC,
> + IFLA_BRIDGE_MST_ENTRY_MSTI,
> + IFLA_BRIDGE_MST_ENTRY_STATE,
> + __IFLA_BRIDGE_MST_ENTRY_MAX,
> +};
> +#define IFLA_BRIDGE_MST_ENTRY_MAX (__IFLA_BRIDGE_MST_ENTRY_MAX - 1)
> +
> struct bridge_stp_xstats {
> __u64 transition_blk;
> __u64 transition_fwd;
> @@ -786,4 +802,5 @@ enum {
> __BRIDGE_QUERIER_MAX
> };
> #define BRIDGE_QUERIER_MAX (__BRIDGE_QUERIER_MAX - 1)
> +
stray new line
> #endif /* _UAPI_LINUX_IF_BRIDGE_H */
> diff --git a/include/uapi/linux/rtnetlink.h b/include/uapi/linux/rtnetlink.h
> index 51530aade46e..83849a37db5b 100644
> --- a/include/uapi/linux/rtnetlink.h
> +++ b/include/uapi/linux/rtnetlink.h
> @@ -817,6 +817,7 @@ enum {
> #define RTEXT_FILTER_MRP (1 << 4)
> #define RTEXT_FILTER_CFM_CONFIG (1 << 5)
> #define RTEXT_FILTER_CFM_STATUS (1 << 6)
> +#define RTEXT_FILTER_MST (1 << 7)
>
> /* End of information exported to user level */
>
> diff --git a/net/bridge/br_mst.c b/net/bridge/br_mst.c
> index 78ef5fea4d2b..df65aa7701c1 100644
> --- a/net/bridge/br_mst.c
> +++ b/net/bridge/br_mst.c
> @@ -124,3 +124,108 @@ int br_mst_set_enabled(struct net_bridge *br, bool on,
> br_opt_toggle(br, BROPT_MST_ENABLED, on);
> return 0;
> }
> +
> +int br_mst_fill_info(struct sk_buff *skb, struct net_bridge_vlan_group *vg)
const vg
> +{
> + struct net_bridge_vlan *v;
const v
> + struct nlattr *nest;
> + unsigned long *seen;
> + int err = 0;
> +
> + seen = bitmap_zalloc(VLAN_N_VID, 0);
> + if (!seen)
> + return -ENOMEM;
> +
> + list_for_each_entry(v, &vg->vlan_list, vlist) {
> + if (test_bit(v->brvlan->msti, seen))
> + continue;
> +
> + nest = nla_nest_start_noflag(skb, IFLA_BRIDGE_MST_ENTRY);
> + if (!nest ||
> + nla_put_u16(skb, IFLA_BRIDGE_MST_ENTRY_MSTI, v->brvlan->msti) ||
> + nla_put_u8(skb, IFLA_BRIDGE_MST_ENTRY_STATE, v->state)) {
> + err = -EMSGSIZE;
> + break;
> + }
> + nla_nest_end(skb, nest);
> +
> + set_bit(v->brvlan->msti, seen);
__set_bit()
> + }
> +
> + kfree(seen);
> + return err;
> +}
> +
> +static const struct nla_policy br_mst_nl_policy[IFLA_BRIDGE_MST_ENTRY_MAX + 1] = {
> + [IFLA_BRIDGE_MST_ENTRY_MSTI] = NLA_POLICY_RANGE(NLA_U16,
> + 1, /* 0 reserved for CST */
> + VLAN_N_VID - 1),
> + [IFLA_BRIDGE_MST_ENTRY_STATE] = NLA_POLICY_RANGE(NLA_U8,
> + BR_STATE_DISABLED,
> + BR_STATE_BLOCKING),
> +};
> +
> +static int br_mst_parse_one(struct net_bridge_port *p,
> + const struct nlattr *attr,
> + struct netlink_ext_ack *extack)
> +{
I'd either set the state after parsing, so this function just does what it
says (parse) or I'd rename it.
> + struct nlattr *tb[IFLA_BRIDGE_MST_ENTRY_MAX + 1];
> + u16 msti;
> + u8 state;
> + int err;
> +
> + err = nla_parse_nested(tb, IFLA_BRIDGE_MST_ENTRY_MAX, attr,
> + br_mst_nl_policy, extack);
> + if (err)
> + return err;
> +
> + if (!tb[IFLA_BRIDGE_MST_ENTRY_MSTI]) {
> + NL_SET_ERR_MSG_MOD(extack, "MSTI not specified");
> + return -EINVAL;
> + }
> +
> + if (!tb[IFLA_BRIDGE_MST_ENTRY_STATE]) {
> + NL_SET_ERR_MSG_MOD(extack, "State not specified");
> + return -EINVAL;
> + }
> +
> + msti = nla_get_u16(tb[IFLA_BRIDGE_MST_ENTRY_MSTI]);
> + state = nla_get_u8(tb[IFLA_BRIDGE_MST_ENTRY_STATE]);
> +
> + br_mst_set_state(p, msti, state);
> + return 0;
> +}
> +
> +int br_mst_parse(struct net_bridge_port *p, struct nlattr *mst_attr,
> + struct netlink_ext_ack *extack)
This doesn't just parse though, it also sets the state. Please rename it to
something more appropriate.
const mst_attr
> +{
> + struct nlattr *attr;
> + int err, msts = 0;
> + int rem;
> +
> + if (!br_opt_get(p->br, BROPT_MST_ENABLED)) {
> + NL_SET_ERR_MSG_MOD(extack, "Can't modify MST state when MST is disabled");
> + return -EBUSY;
> + }
> +
> + nla_for_each_nested(attr, mst_attr, rem) {
> + switch (nla_type(attr)) {
> + case IFLA_BRIDGE_MST_ENTRY:
> + err = br_mst_parse_one(p, attr, extack);
> + break;
> + default:
> + continue;
> + }
> +
> + msts++;
> + if (err)
> + break;
> + }
> +
> + if (!msts) {
> + NL_SET_ERR_MSG_MOD(extack, "Found no MST entries to process");
> + err = -EINVAL;
> + }
> +
> + return err;
> +}
> diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
> index 7d4432ca9a20..d2b4550f30d6 100644
> --- a/net/bridge/br_netlink.c
> +++ b/net/bridge/br_netlink.c
> @@ -485,7 +485,8 @@ static int br_fill_ifinfo(struct sk_buff *skb,
> RTEXT_FILTER_BRVLAN_COMPRESSED |
> RTEXT_FILTER_MRP |
> RTEXT_FILTER_CFM_CONFIG |
> - RTEXT_FILTER_CFM_STATUS)) {
> + RTEXT_FILTER_CFM_STATUS |
> + RTEXT_FILTER_MST)) {
> af = nla_nest_start_noflag(skb, IFLA_AF_SPEC);
> if (!af)
> goto nla_put_failure;
> @@ -564,7 +565,28 @@ static int br_fill_ifinfo(struct sk_buff *skb,
> nla_nest_end(skb, cfm_nest);
> }
>
> + if ((filter_mask & RTEXT_FILTER_MST) &&
> + br_opt_get(br, BROPT_MST_ENABLED) && port) {
> + struct net_bridge_vlan_group *vg = nbp_vlan_group(port);
const vg
> + struct nlattr *mst_nest;
> + int err;
> +
> + if (!vg || !vg->num_vlans)
> + goto done;
> +
> + mst_nest = nla_nest_start(skb, IFLA_BRIDGE_MST);
> + if (!mst_nest)
> + goto nla_put_failure;
> +
> + err = br_mst_fill_info(skb, vg);
> + if (err)
> + goto nla_put_failure;
> +
> + nla_nest_end(skb, mst_nest);
> + }
> +
I think you should also update br_get_link_af_size_filtered() to account for the
new dump attributes based on the filter. I'd adjust vinfo_sz based on the filter
flag.
> done:
> +
> if (af)
> nla_nest_end(skb, af);
> nlmsg_end(skb, nlh);
> @@ -803,6 +825,14 @@ static int br_afspec(struct net_bridge *br,
> if (err)
> return err;
> break;
> + case IFLA_BRIDGE_MST:
> + if (cmd != RTM_SETLINK || !p)
> + return -EINVAL;
These are two different errors, please set extack appropriately
for each error.
> +
> + err = br_mst_parse(p, attr, extack);
> + if (err)
> + return err;
> + break;
> }
> }
>
> diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
> index b907d389b63a..08d82578bd97 100644
> --- a/net/bridge/br_private.h
> +++ b/net/bridge/br_private.h
> @@ -1783,6 +1783,9 @@ int br_mst_vlan_set_msti(struct net_bridge_vlan *v, u16 msti);
> void br_mst_vlan_init_state(struct net_bridge_vlan *v);
> int br_mst_set_enabled(struct net_bridge *br, bool on,
> struct netlink_ext_ack *extack);
> +int br_mst_fill_info(struct sk_buff *skb, struct net_bridge_vlan_group *vg);
> +int br_mst_parse(struct net_bridge_port *p, struct nlattr *mst_attr,
> + struct netlink_ext_ack *extack);
> #else
> static inline bool br_mst_is_enabled(struct net_bridge *br)
> {
> @@ -1791,6 +1794,18 @@ static inline bool br_mst_is_enabled(struct net_bridge *br)
>
> static inline void br_mst_set_state(struct net_bridge_port *p,
> u16 msti, u8 state) {}
> +static inline int br_mst_fill_info(struct sk_buff *skb,
> + struct net_bridge_vlan_group *vg)
> +{
> + return -EOPNOTSUPP;
> +}
> +
> +static inline int br_mst_parse(struct net_bridge_port *p,
> + struct nlattr *mst_attr,
> + struct netlink_ext_ack *extack)
> +{
> + return -EOPNOTSUPP;
> +}
> #endif
>
> struct nf_br_ops {
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