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SubjectRe: [PATCH RFC 6/7] bridge: cfm: Netlink Notifications.
Date
On Fri, 2020-09-04 at 09:15 +0000, Henrik Bjoernlund wrote:
> This is the implementation of Netlink notifications out of CFM.
>
> Notifications are initiated whenever a state change happens in CFM.
>
[snip]
> @@ -445,6 +458,7 @@ static int br_cfm_frame_rx(struct net_bridge_port *port, struct sk_buff *skb)
> peer_mep->cc_status.ccm_defect = false;
>
> /* Change in CCM defect status - notify */
> + br_cfm_notify(RTM_NEWLINK, port);
>
> /* Start CCM RX timer */
> ccm_rx_timer_start(peer_mep);
> @@ -874,6 +888,35 @@ int br_cfm_cc_counters_clear(struct net_bridge *br, const u32 instance,
> return 0;
> }
>
> +int br_cfm_mep_count(struct net_bridge *br, u32 *count)
> +{
> + struct br_cfm_mep *mep;

Leave a blank line between local variable definitions and code.

> + *count = 0;
> +
> + rcu_read_lock();
> + list_for_each_entry_rcu(mep, &br->mep_list, head)
> + * count += 1;

please remove the extra space

> + rcu_read_unlock();
> +
> + return 0;
> +}
> +
> +int br_cfm_peer_mep_count(struct net_bridge *br, u32 *count)
> +{
> + struct br_cfm_peer_mep *peer_mep;
> + struct br_cfm_mep *mep;

Leave a blank line between local variable definitions and code.

> + *count = 0;
> +
> + rcu_read_lock();
> + list_for_each_entry_rcu(mep, &br->mep_list, head) {
> + list_for_each_entry_rcu(peer_mep, &mep->peer_mep_list, head)
> + * count += 1;

please remove the extra space

> + }
> + rcu_read_unlock();
> +
> + return 0;
> +}
> +
> bool br_cfm_created(struct net_bridge *br)
> {
> return !list_empty(&br->mep_list);
> diff --git a/net/bridge/br_cfm_netlink.c b/net/bridge/br_cfm_netlink.c
> index 4e39aab1cd0b..13664ac8608a 100644
> --- a/net/bridge/br_cfm_netlink.c
> +++ b/net/bridge/br_cfm_netlink.c
> @@ -582,7 +582,9 @@ int br_cfm_config_fill_info(struct sk_buff *skb, struct net_bridge *br)
> return -EMSGSIZE;
> }
>
> -int br_cfm_status_fill_info(struct sk_buff *skb, struct net_bridge *br)
> +int br_cfm_status_fill_info(struct sk_buff *skb,
> + struct net_bridge *br,
> + bool getlink)
> {
> struct nlattr *tb, *cfm_tb;
> struct br_cfm_mep *mep;
> @@ -613,10 +615,12 @@ int br_cfm_status_fill_info(struct sk_buff *skb, struct net_bridge *br)
> mep->status.rx_level_low_seen))
> goto nla_put_failure;
>
> - /* Clear all 'seen' indications */
> - mep->status.opcode_unexp_seen = false;
> - mep->status.version_unexp_seen = false;
> - mep->status.rx_level_low_seen = false;
> + if (getlink) { /* Only clear if this is a GETLINK */
> + /* Clear all 'seen' indications */
> + mep->status.opcode_unexp_seen = false;
> + mep->status.version_unexp_seen = false;
> + mep->status.rx_level_low_seen = false;
> + }
>
> nla_nest_end(skb, tb);
>
> @@ -662,10 +666,12 @@ int br_cfm_status_fill_info(struct sk_buff *skb, struct net_bridge *br)
> peer_mep->cc_status.seq_unexp_seen))
> goto nla_put_failure;
>
> - /* Clear all 'seen' indications */
> - peer_mep->cc_status.seen = false;
> - peer_mep->cc_status.tlv_seen = false;
> - peer_mep->cc_status.seq_unexp_seen = false;
> + if (getlink) { /* Only clear if this is a GETLINK */
> + /* Clear all 'seen' indications */
> + peer_mep->cc_status.seen = false;
> + peer_mep->cc_status.tlv_seen = false;
> + peer_mep->cc_status.seq_unexp_seen = false;

Why clear these on GETLINK? This sounds like it should be a set op.

> + }
>
> nla_nest_end(skb, tb);
> }
> diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
> index 6de5cb1295f6..f2e885521f4f 100644
> --- a/net/bridge/br_netlink.c
> +++ b/net/bridge/br_netlink.c
> @@ -94,9 +94,11 @@ static size_t br_get_link_af_size_filtered(const struct net_device *dev,
> {
> struct net_bridge_vlan_group *vg = NULL;
> struct net_bridge_port *p = NULL;
> - struct net_bridge *br;
> - int num_vlan_infos;
> + struct net_bridge *br = NULL;
> + u32 num_cfm_peer_mep_infos;
> + u32 num_cfm_mep_infos;
> size_t vinfo_sz = 0;
> + int num_vlan_infos;
>
> rcu_read_lock();
> if (netif_is_bridge_port(dev)) {
> @@ -115,6 +117,52 @@ static size_t br_get_link_af_size_filtered(const struct net_device *dev,
> /* Each VLAN is returned in bridge_vlan_info along with flags */
> vinfo_sz += num_vlan_infos * nla_total_size(sizeof(struct bridge_vlan_info));
>
> + if (!(filter_mask & RTEXT_FILTER_CFM_STATUS))
> + return vinfo_sz;
> +
> + if (!br)
> + return vinfo_sz;
> +
> + /* CFM status info must be added */
> + if (br_cfm_mep_count(br, &num_cfm_mep_infos))
> + return vinfo_sz;
> +
> + if (br_cfm_peer_mep_count(br, &num_cfm_peer_mep_infos))
> + return vinfo_sz;
> +

Can these return non-0 at all?

> + vinfo_sz += nla_total_size(0); /* IFLA_BRIDGE_CFM */
> + /* For each status struct the MEP instance (u32) is added */
> + /* MEP instance (u32) + br_cfm_mep_status */
> + vinfo_sz += num_cfm_mep_infos *
> + /*IFLA_BRIDGE_CFM_MEP_STATUS_INSTANCE */
> + (nla_total_size(sizeof(u32))
> + /* IFLA_BRIDGE_CFM_MEP_STATUS_OPCODE_UNEXP_SEEN */
> + + nla_total_size(sizeof(u32))
> + /* IFLA_BRIDGE_CFM_MEP_STATUS_VERSION_UNEXP_SEEN */
> + + nla_total_size(sizeof(u32))
> + /* IFLA_BRIDGE_CFM_MEP_STATUS_RX_LEVEL_LOW_SEEN */
> + + nla_total_size(sizeof(u32)));
> + /* MEP instance (u32) + br_cfm_cc_peer_status */
> + vinfo_sz += num_cfm_peer_mep_infos *
> + /* IFLA_BRIDGE_CFM_CC_PEER_STATUS_INSTANCE */
> + (nla_total_size(sizeof(u32))
> + /* IFLA_BRIDGE_CFM_CC_PEER_STATUS_PEER_MEPID */
> + + nla_total_size(sizeof(u32))
> + /* IFLA_BRIDGE_CFM_CC_PEER_STATUS_CCM_DEFECT */
> + + nla_total_size(sizeof(u32))
> + /* IFLA_BRIDGE_CFM_CC_PEER_STATUS_RDI */
> + + nla_total_size(sizeof(u32))
> + /* IFLA_BRIDGE_CFM_CC_PEER_STATUS_PORT_TLV_VALUE */
> + + nla_total_size(sizeof(u8))
> + /* IFLA_BRIDGE_CFM_CC_PEER_STATUS_IF_TLV_VALUE */
> + + nla_total_size(sizeof(u8))
> + /* IFLA_BRIDGE_CFM_CC_PEER_STATUS_SEEN */
> + + nla_total_size(sizeof(u32))
> + /* IFLA_BRIDGE_CFM_CC_PEER_STATUS_TLV_SEEN */
> + + nla_total_size(sizeof(u32))
> + /* IFLA_BRIDGE_CFM_CC_PEER_STATUS_SEQ_UNEXP_SEEN */
> + + nla_total_size(sizeof(u32)));
> +
> return vinfo_sz;
> }
>
> @@ -378,7 +426,8 @@ static int br_fill_ifvlaninfo(struct sk_buff *skb,
> static int br_fill_ifinfo(struct sk_buff *skb,
> const struct net_bridge_port *port,
> u32 pid, u32 seq, int event, unsigned int flags,
> - u32 filter_mask, const struct net_device *dev)
> + u32 filter_mask, const struct net_device *dev,
> + bool getlink)
> {
> u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
> struct net_bridge *br;
> @@ -515,7 +564,7 @@ static int br_fill_ifinfo(struct sk_buff *skb,
> goto nla_put_failure;
>
> rcu_read_lock();
> - err = br_cfm_status_fill_info(skb, br);
> + err = br_cfm_status_fill_info(skb, br, getlink);
> rcu_read_unlock();
>
> if (err)
> @@ -533,11 +582,9 @@ static int br_fill_ifinfo(struct sk_buff *skb,
> return -EMSGSIZE;
> }
>
> -/* Notify listeners of a change in bridge or port information */
> -void br_ifinfo_notify(int event, const struct net_bridge *br,
> - const struct net_bridge_port *port)
> +void br_info_notify(int event, const struct net_bridge *br,
> + const struct net_bridge_port *port, u32 filter)
> {
> - u32 filter = RTEXT_FILTER_BRVLAN_COMPRESSED;
> struct net_device *dev;
> struct sk_buff *skb;
> int err = -ENOBUFS;
> @@ -562,7 +609,7 @@ void br_ifinfo_notify(int event, const struct net_bridge *br,
> if (skb == NULL)
> goto errout;
>
> - err = br_fill_ifinfo(skb, port, 0, 0, event, 0, filter, dev);
> + err = br_fill_ifinfo(skb, port, 0, 0, event, 0, filter, dev, false);
> if (err < 0) {
> /* -EMSGSIZE implies BUG in br_nlmsg_size() */
> WARN_ON(err == -EMSGSIZE);
> @@ -575,6 +622,15 @@ void br_ifinfo_notify(int event, const struct net_bridge *br,
> rtnl_set_sk_err(net, RTNLGRP_LINK, err);
> }
>
> +/* Notify listeners of a change in bridge or port information */
> +void br_ifinfo_notify(int event, const struct net_bridge *br,
> + const struct net_bridge_port *port)
> +{
> + u32 filter = RTEXT_FILTER_BRVLAN_COMPRESSED;
> +
> + return br_info_notify(event, br, port, filter);
> +}
> +
> /*
> * Dump information about all ports, in response to GETLINK
> */
> @@ -591,7 +647,7 @@ int br_getlink(struct sk_buff *skb, u32 pid, u32 seq,
> return 0;
>
> return br_fill_ifinfo(skb, port, pid, seq, RTM_NEWLINK, nlflags,
> - filter_mask, dev);
> + filter_mask, dev, true);
> }
>
> static int br_vlan_info(struct net_bridge *br, struct net_bridge_port *p,
> diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
> index fe36592f7525..53bcbdd21f34 100644
> --- a/net/bridge/br_private.h
> +++ b/net/bridge/br_private.h
> @@ -1370,7 +1370,11 @@ int br_cfm_parse(struct net_bridge *br, struct net_bridge_port *p,
> int br_cfm_rx_frame_process(struct net_bridge_port *p, struct sk_buff *skb);
> bool br_cfm_created(struct net_bridge *br);
> int br_cfm_config_fill_info(struct sk_buff *skb, struct net_bridge *br);
> -int br_cfm_status_fill_info(struct sk_buff *skb, struct net_bridge *br);
> +int br_cfm_status_fill_info(struct sk_buff *skb,
> + struct net_bridge *br,
> + bool getlink);
> +int br_cfm_mep_count(struct net_bridge *br, u32 *count);
> +int br_cfm_peer_mep_count(struct net_bridge *br, u32 *count);
> #else
> static inline int br_cfm_parse(struct net_bridge *br, struct net_bridge_port *p,
> struct nlattr *attr, int cmd,
> @@ -1394,7 +1398,19 @@ static inline int br_cfm_config_fill_info(struct sk_buff *skb, struct net_bridge
> return -EOPNOTSUPP;
> }
>
> -static inline int br_cfm_status_fill_info(struct sk_buff *skb, struct net_bridge *br)
> +static inline int br_cfm_status_fill_info(struct sk_buff *skb,
> + struct net_bridge *br,
> + bool getlink)
> +{
> + return -EOPNOTSUPP;
> +}
> +
> +static inline int br_cfm_mep_count(struct net_bridge *br, u32 *count)
> +{
> + return -EOPNOTSUPP;
> +}
> +
> +static inline int br_cfm_peer_mep_count(struct net_bridge *br, u32 *count)
> {
> return -EOPNOTSUPP;
> }
> @@ -1406,6 +1422,8 @@ int br_netlink_init(void);
> void br_netlink_fini(void);
> void br_ifinfo_notify(int event, const struct net_bridge *br,
> const struct net_bridge_port *port);
> +void br_info_notify(int event, const struct net_bridge *br,
> + const struct net_bridge_port *port, u32 filter);
> int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags,
> struct netlink_ext_ack *extack);
> int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);

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