On Mon, Aug 22, 2022 at 4:01 AM Nikolay Aleksandrov <razor@xxxxxxxxxxxxx> wrote:
On 20/08/2022 14:33, Sevinj Aghayeva wrote:
> On Thu, Aug 18, 2022 at 8:00 AM Nikolay Aleksandrov <razor@xxxxxxxxxxxxx> wrote:
>>
>> On 18/08/2022 14:50, Sevinj Aghayeva wrote:
[snip]
>>
>> Hi,
>> Handling all vlan device-related changes in br_vlan_device_event() sounds good to me.
>> Please add it to br_vlan.c.
>
> Hi Nik,
>
> Can you please review this diff before I make it into a proper patchset? Thanks!
>
Hi,
A few comments inline below, but in general when you prepare the rfc commit please
explain the motivation in detail why this way was chosen and a new notification type
is needed (e.g. why not use NETDEV_CHANGEINFODATA or extend NETDEV_CHANGE).
As I mentioned earlier it'd be nice to get feedback from others about adding this
new notification, so they should know the "why" in detail.
Sure, I will do that in the RFC patchset, but first I want to make sure I got the details right before making the RFC patchset. Thanks for the feedback. Please see inline.
> diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> index 2563d30736e9..0ce3da42325e 100644
> --- a/include/linux/netdevice.h
> +++ b/include/linux/netdevice.h
> @@ -2762,6 +2762,7 @@ enum netdev_cmd {
> NETDEV_UNREGISTER,
> NETDEV_CHANGEMTU, /* notify after mtu change happened */
> NETDEV_CHANGEADDR, /* notify after the address change */
> + NETDEV_CHANGE_DETAILS,
> NETDEV_PRE_CHANGEADDR, /* notify before the address change */
> NETDEV_GOING_DOWN,
> NETDEV_CHANGENAME,
> @@ -2837,6 +2838,13 @@ struct netdev_notifier_changelowerstate_info {
> void *lower_state_info; /* is lower dev state */
> };
>
> +struct netdev_notifier_change_details_info {
> + struct netdev_notifier_info info; /* must be first */
> + union {
> + bool bridge_binding;
this should be in a vlan-specific structure, defined in if_vlan.h
every other link type which wants to use the notification would define its
own struct type
Okay, will move it there.
> + } details;
> +};
> +
> struct netdev_notifier_pre_changeaddr_info {
> struct netdev_notifier_info info; /* must be first */
> const unsigned char *dev_addr;
> @@ -3836,6 +3844,8 @@ int __dev_set_mtu(struct net_device *, int);
> int dev_set_mtu(struct net_device *, int);
> int dev_pre_changeaddr_notify(struct net_device *dev, const char *addr,
> struct netlink_ext_ack *extack);
> +int dev_change_details_notify(struct net_device *dev, bool bridge_binding,
> + struct netlink_ext_ack *extack);
this helper is not needed
> int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa,
> struct netlink_ext_ack *extack);
> int dev_set_mac_address_user(struct net_device *dev, struct sockaddr *sa,
> diff --git a/net/8021q/vlan.h b/net/8021q/vlan.h
> index 5eaf38875554..71947cdcfaaa 100644
> --- a/net/8021q/vlan.h
> +++ b/net/8021q/vlan.h
> @@ -130,7 +130,7 @@ void vlan_dev_set_ingress_priority(const struct
> net_device *dev,
> int vlan_dev_set_egress_priority(const struct net_device *dev,
> u32 skb_prio, u16 vlan_prio);
> void vlan_dev_free_egress_priority(const struct net_device *dev);
> -int vlan_dev_change_flags(const struct net_device *dev, u32 flag, u32 mask);
> +int vlan_dev_change_flags(struct net_device *dev, u32 flag, u32 mask);
> void vlan_dev_get_realdev_name(const struct net_device *dev, char *result,
> size_t size);
>
> diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c
> index 839f2020b015..489baa8435de 100644
> --- a/net/8021q/vlan_dev.c
> +++ b/net/8021q/vlan_dev.c
> @@ -211,7 +211,7 @@ int vlan_dev_set_egress_priority(const struct
> net_device *dev,
> /* Flags are defined in the vlan_flags enum in
> * include/uapi/linux/if_vlan.h file.
> */
> -int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
> +int vlan_dev_change_flags(struct net_device *dev, u32 flags, u32 mask)
please don't remove the const, this function shouldn't change dev's struct
I tried not to remove const, but it seems impossible because call_netdevice_notifiers_info that we eventually call from vlan_dev_change_flags takes a non-const struct info that has a dev field being set from the const vlan_dev_change_flags.
> {
> struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
> u32 old_flags = vlan->flags;
> @@ -223,19 +223,29 @@ int vlan_dev_change_flags(const struct
> net_device *dev, u32 flags, u32 mask)
>
> vlan->flags = (old_flags & ~mask) | (flags & mask);
>
> - if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
> + if (!netif_running(dev))
> + return 0;
> +
> + if ((vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
> if (vlan->flags & VLAN_FLAG_GVRP)
> vlan_gvrp_request_join(dev);
> else
> vlan_gvrp_request_leave(dev);
> }
>
> - if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_MVRP) {
> + if ((vlan->flags ^ old_flags) & VLAN_FLAG_MVRP) {
> if (vlan->flags & VLAN_FLAG_MVRP)
> vlan_mvrp_request_join(dev);
> else
> vlan_mvrp_request_leave(dev);
> }
> +
> + if ((vlan->flags ^ old_flags) & VLAN_FLAG_BRIDGE_BINDING &&
> + netif_is_bridge_master(vlan->real_dev)) {
> + dev_change_details_notify(dev,
> + !!(vlan->flags & VLAN_FLAG_BRIDGE_BINDING), NULL);
this helper is not needed, just fill in the details here and send the notification
Okay, in that case I will need to export call_netdevice_notifiers_info so that I can call it from here.
> + }
> +
> return 0;
> }
>
> diff --git a/net/bridge/br.c b/net/bridge/br.c
> index 96e91d69a9a8..62e939c6a3f0 100644
> --- a/net/bridge/br.c
> +++ b/net/bridge/br.c
> @@ -51,6 +51,11 @@ static int br_device_event(struct notifier_block
> *unused, unsigned long event, v
> }
> }
>
> + if (is_vlan_dev(dev)) {
> + br_vlan_device_event(dev, event, ptr);
> + return NOTIFY_DONE;
> + }
> +
> /* not a port of a bridge */
> p = br_port_get_rtnl(dev);
> if (!p)
> diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
> index 06e5f6faa431..a9a08e49c76c 100644
> --- a/net/bridge/br_private.h
> +++ b/net/bridge/br_private.h
> @@ -1470,6 +1470,8 @@ void br_vlan_get_stats(const struct net_bridge_vlan *v,
> void br_vlan_port_event(struct net_bridge_port *p, unsigned long event);
> int br_vlan_bridge_event(struct net_device *dev, unsigned long event,
> void *ptr);
> +void br_vlan_device_event(struct net_device *dev, unsigned long event,
> + void *ptr);
> void br_vlan_rtnl_init(void);
> void br_vlan_rtnl_uninit(void);
> void br_vlan_notify(const struct net_bridge *br,
> @@ -1701,6 +1703,11 @@ static inline int br_vlan_bridge_event(struct
> net_device *dev,
> return 0;
> }
>
> +static void br_vlan_device_event(struct net_device *dev,
> + unsigned long event, void *ptr)
> +{
> +}
> +
> static inline void br_vlan_rtnl_init(void)
> {
> }
> diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c
> index 0f5e75ccac79..70a9950df175 100644
> --- a/net/bridge/br_vlan.c
> +++ b/net/bridge/br_vlan.c
> @@ -1768,6 +1768,20 @@ void br_vlan_port_event(struct net_bridge_port
> *p, unsigned long event)
> }
> }
>
> +void br_vlan_device_event(struct net_device *dev, unsigned long
> event, void *ptr)
> +{
> + struct netdev_notifier_change_details_info *info;
> + struct net_device *br_dev;
> +
> + switch (event) {
> + case NETDEV_CHANGE_DETAILS:
> + info = ptr;
> + br_dev = vlan_dev_priv(dev)->real_dev;
you're not guaranteed to have a bridge device as its real_dev, so you should
validate that the vlan's real dev is a bridge
Okay, will do.
> + br_vlan_upper_change(br_dev, dev, info->details.bridge_binding);
> + break;
> + }
> +}
> +
> static bool br_vlan_stats_fill(struct sk_buff *skb,
> const struct net_bridge_vlan *v)
> {
> diff --git a/net/core/dev.c b/net/core/dev.c
> index 30a1603a7225..dcdbc625585d 100644
> --- a/net/core/dev.c
> +++ b/net/core/dev.c
> @@ -1624,7 +1624,7 @@ const char *netdev_cmd_to_name(enum netdev_cmd cmd)
> N(POST_INIT) N(RELEASE) N(NOTIFY_PEERS) N(JOIN) N(CHANGEUPPER)
> N(RESEND_IGMP) N(PRECHANGEMTU) N(CHANGEINFODATA) N(BONDING_INFO)
> N(PRECHANGEUPPER) N(CHANGELOWERSTATE) N(UDP_TUNNEL_PUSH_INFO)
> - N(UDP_TUNNEL_DROP_INFO) N(CHANGE_TX_QUEUE_LEN)
> + N(UDP_TUNNEL_DROP_INFO) N(CHANGE_TX_QUEUE_LEN) N(CHANGE_DETAILS)
> N(CVLAN_FILTER_PUSH_INFO) N(CVLAN_FILTER_DROP_INFO)
> N(SVLAN_FILTER_PUSH_INFO) N(SVLAN_FILTER_DROP_INFO)
> N(PRE_CHANGEADDR) N(OFFLOAD_XSTATS_ENABLE) N(OFFLOAD_XSTATS_DISABLE)
> @@ -8767,6 +8767,27 @@ int dev_pre_changeaddr_notify(struct net_device
> *dev, const char *addr,
> }
> EXPORT_SYMBOL(dev_pre_changeaddr_notify);
>
> +/**
> + * dev_change_details_notify - Call NETDEV_PRE_CHANGE_DETAILS.
> + * @dev: device
> + * @bridge_binding: bridge binding setting
> + * @extack: netlink extended ack
> + */
> +int dev_change_details_notify(struct net_device *dev, bool bridge_binding,
> + struct netlink_ext_ack *extack)
> +{
> + struct netdev_notifier_change_details_info info = {
> + .info.dev = dev,
> + .info.extack = extack,
> + .details.bridge_binding = bridge_binding,
> + };
> + int rc;
> +
> + rc = call_netdevice_notifiers_info(NETDEV_CHANGE_DETAILS, &info.info);
> + return notifier_to_errno(rc);
> +}
> +EXPORT_SYMBOL(dev_change_details_notify);
> +
this helper is unnecessary, just fill in the struct at the caller site and
send the notification directly
Okay, will remove it.
Thanks for the review! I will send the updated patch soon.
> /**
> * dev_set_mac_address - Change Media Access Control Address
> * @dev: device
>
>
>>
>> Thanks,
>> Nik
>>
>>
Cheers,
Nik
Sevinj.Aghayeva
