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SubjectRe: [PATCH net-next v4 08/12] bridge: mrp: Implement the MRP Interconnect API
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On 14/07/2020 10:34, Horatiu Vultur wrote:
> Thie patch adds support for MRP Interconnect. Similar with the MRP ring,
> if the HW can't generate MRP_InTest frames, then the SW will try to
> generate them. And if also the SW fails to generate the frames then an
> error is return to userspace.
>
> The forwarding/termination of MRP_In frames is happening in the kernel
> and is done by MRP instances.
>
> Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
> ---
> net/bridge/br_mrp.c | 570 ++++++++++++++++++++++++++++++++++--
> net/bridge/br_private_mrp.h | 4 +
> 2 files changed, 543 insertions(+), 31 deletions(-)
>

Acked-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>

> diff --git a/net/bridge/br_mrp.c b/net/bridge/br_mrp.c
> index fe7cf1446b58a..b36689e6e7cba 100644
> --- a/net/bridge/br_mrp.c
> +++ b/net/bridge/br_mrp.c
> @@ -4,6 +4,27 @@
> #include "br_private_mrp.h"
>
> static const u8 mrp_test_dmac[ETH_ALEN] = { 0x1, 0x15, 0x4e, 0x0, 0x0, 0x1 };
> +static const u8 mrp_in_test_dmac[ETH_ALEN] = { 0x1, 0x15, 0x4e, 0x0, 0x0, 0x3 };
> +
> +static bool br_mrp_is_ring_port(struct net_bridge_port *p_port,
> + struct net_bridge_port *s_port,
> + struct net_bridge_port *port)
> +{
> + if (port == p_port ||
> + port == s_port)
> + return true;
> +
> + return false;
> +}
> +
> +static bool br_mrp_is_in_port(struct net_bridge_port *i_port,
> + struct net_bridge_port *port)
> +{
> + if (port == i_port)
> + return true;
> +
> + return false;
> +}
>
> static struct net_bridge_port *br_mrp_get_port(struct net_bridge *br,
> u32 ifindex)
> @@ -37,6 +58,22 @@ static struct br_mrp *br_mrp_find_id(struct net_bridge *br, u32 ring_id)
> return res;
> }
>
> +static struct br_mrp *br_mrp_find_in_id(struct net_bridge *br, u32 in_id)
> +{
> + struct br_mrp *res = NULL;
> + struct br_mrp *mrp;
> +
> + list_for_each_entry_rcu(mrp, &br->mrp_list, list,
> + lockdep_rtnl_is_held()) {
> + if (mrp->in_id == in_id) {
> + res = mrp;
> + break;
> + }
> + }
> +
> + return res;
> +}
> +
> static bool br_mrp_unique_ifindex(struct net_bridge *br, u32 ifindex)
> {
> struct br_mrp *mrp;
> @@ -52,6 +89,10 @@ static bool br_mrp_unique_ifindex(struct net_bridge *br, u32 ifindex)
> p = rtnl_dereference(mrp->s_port);
> if (p && p->dev->ifindex == ifindex)
> return false;
> +
> + p = rtnl_dereference(mrp->i_port);
> + if (p && p->dev->ifindex == ifindex)
> + return false;
> }
>
> return true;
> @@ -66,7 +107,8 @@ static struct br_mrp *br_mrp_find_port(struct net_bridge *br,
> list_for_each_entry_rcu(mrp, &br->mrp_list, list,
> lockdep_rtnl_is_held()) {
> if (rcu_access_pointer(mrp->p_port) == p ||
> - rcu_access_pointer(mrp->s_port) == p) {
> + rcu_access_pointer(mrp->s_port) == p ||
> + rcu_access_pointer(mrp->i_port) == p) {
> res = mrp;
> break;
> }
> @@ -160,6 +202,36 @@ static struct sk_buff *br_mrp_alloc_test_skb(struct br_mrp *mrp,
> return skb;
> }
>
> +static struct sk_buff *br_mrp_alloc_in_test_skb(struct br_mrp *mrp,
> + struct net_bridge_port *p,
> + enum br_mrp_port_role_type port_role)
> +{
> + struct br_mrp_in_test_hdr *hdr = NULL;
> + struct sk_buff *skb = NULL;
> +
> + if (!p)
> + return NULL;
> +
> + skb = br_mrp_skb_alloc(p, p->dev->dev_addr, mrp_in_test_dmac);
> + if (!skb)
> + return NULL;
> +
> + br_mrp_skb_tlv(skb, BR_MRP_TLV_HEADER_IN_TEST, sizeof(*hdr));
> + hdr = skb_put(skb, sizeof(*hdr));
> +
> + hdr->id = cpu_to_be16(mrp->in_id);
> + ether_addr_copy(hdr->sa, p->br->dev->dev_addr);
> + hdr->port_role = cpu_to_be16(port_role);
> + hdr->state = cpu_to_be16(mrp->in_state);
> + hdr->transitions = cpu_to_be16(mrp->in_transitions);
> + hdr->timestamp = cpu_to_be32(jiffies_to_msecs(jiffies));
> +
> + br_mrp_skb_common(skb, mrp);
> + br_mrp_skb_tlv(skb, BR_MRP_TLV_HEADER_END, 0x0);
> +
> + return skb;
> +}
> +
> /* This function is continuously called in the following cases:
> * - when node role is MRM, in this case test_monitor is always set to false
> * because it needs to notify the userspace that the ring is open and needs to
> @@ -239,6 +311,83 @@ static void br_mrp_test_work_expired(struct work_struct *work)
> usecs_to_jiffies(mrp->test_interval));
> }
>
> +/* This function is continuously called when the node has the interconnect role
> + * MIM. It would generate interconnect test frames and will send them on all 3
> + * ports. But will also check if it stop receiving interconnect test frames.
> + */
> +static void br_mrp_in_test_work_expired(struct work_struct *work)
> +{
> + struct delayed_work *del_work = to_delayed_work(work);
> + struct br_mrp *mrp = container_of(del_work, struct br_mrp, in_test_work);
> + struct net_bridge_port *p;
> + bool notify_open = false;
> + struct sk_buff *skb;
> +
> + if (time_before_eq(mrp->in_test_end, jiffies))
> + return;
> +
> + if (mrp->in_test_count_miss < mrp->in_test_max_miss) {
> + mrp->in_test_count_miss++;
> + } else {
> + /* Notify that the interconnect ring is open only if the
> + * interconnect ring state is closed, otherwise it would
> + * continue to notify at every interval.
> + */
> + if (mrp->in_state == BR_MRP_IN_STATE_CLOSED)
> + notify_open = true;
> + }
> +
> + rcu_read_lock();
> +
> + p = rcu_dereference(mrp->p_port);
> + if (p) {
> + skb = br_mrp_alloc_in_test_skb(mrp, p,
> + BR_MRP_PORT_ROLE_PRIMARY);
> + if (!skb)
> + goto out;
> +
> + skb_reset_network_header(skb);
> + dev_queue_xmit(skb);
> +
> + if (notify_open && !mrp->in_role_offloaded)
> + br_mrp_in_port_open(p->dev, true);
> + }
> +
> + p = rcu_dereference(mrp->s_port);
> + if (p) {
> + skb = br_mrp_alloc_in_test_skb(mrp, p,
> + BR_MRP_PORT_ROLE_SECONDARY);
> + if (!skb)
> + goto out;
> +
> + skb_reset_network_header(skb);
> + dev_queue_xmit(skb);
> +
> + if (notify_open && !mrp->in_role_offloaded)
> + br_mrp_in_port_open(p->dev, true);
> + }
> +
> + p = rcu_dereference(mrp->i_port);
> + if (p) {
> + skb = br_mrp_alloc_in_test_skb(mrp, p,
> + BR_MRP_PORT_ROLE_INTER);
> + if (!skb)
> + goto out;
> +
> + skb_reset_network_header(skb);
> + dev_queue_xmit(skb);
> +
> + if (notify_open && !mrp->in_role_offloaded)
> + br_mrp_in_port_open(p->dev, true);
> + }
> +
> +out:
> + rcu_read_unlock();
> +
> + queue_delayed_work(system_wq, &mrp->in_test_work,
> + usecs_to_jiffies(mrp->in_test_interval));
> +}
> +
> /* Deletes the MRP instance.
> * note: called under rtnl_lock
> */
> @@ -251,6 +400,10 @@ static void br_mrp_del_impl(struct net_bridge *br, struct br_mrp *mrp)
> cancel_delayed_work_sync(&mrp->test_work);
> br_mrp_switchdev_send_ring_test(br, mrp, 0, 0, 0, 0);
>
> + /* Stop sending MRP_InTest frames if has an interconnect role */
> + cancel_delayed_work_sync(&mrp->in_test_work);
> + br_mrp_switchdev_send_in_test(br, mrp, 0, 0, 0);
> +
> br_mrp_switchdev_del(br, mrp);
>
> /* Reset the ports */
> @@ -278,6 +431,18 @@ static void br_mrp_del_impl(struct net_bridge *br, struct br_mrp *mrp)
> rcu_assign_pointer(mrp->s_port, NULL);
> }
>
> + p = rtnl_dereference(mrp->i_port);
> + if (p) {
> + spin_lock_bh(&br->lock);
> + state = netif_running(br->dev) ?
> + BR_STATE_FORWARDING : BR_STATE_DISABLED;
> + p->state = state;
> + p->flags &= ~BR_MRP_AWARE;
> + spin_unlock_bh(&br->lock);
> + br_mrp_port_switchdev_set_state(p, state);
> + rcu_assign_pointer(mrp->i_port, NULL);
> + }
> +
> list_del_rcu(&mrp->list);
> kfree_rcu(mrp, rcu);
> }
> @@ -329,6 +494,7 @@ int br_mrp_add(struct net_bridge *br, struct br_mrp_instance *instance)
> rcu_assign_pointer(mrp->s_port, p);
>
> INIT_DELAYED_WORK(&mrp->test_work, br_mrp_test_work_expired);
> + INIT_DELAYED_WORK(&mrp->in_test_work, br_mrp_in_test_work_expired);
> list_add_tail_rcu(&mrp->list, &br->mrp_list);
>
> err = br_mrp_switchdev_add(br, mrp);
> @@ -511,6 +677,180 @@ int br_mrp_start_test(struct net_bridge *br,
> return 0;
> }
>
> +/* Set in state, int state can be only Open or Closed
> + * note: already called with rtnl_lock
> + */
> +int br_mrp_set_in_state(struct net_bridge *br, struct br_mrp_in_state *state)
> +{
> + struct br_mrp *mrp = br_mrp_find_in_id(br, state->in_id);
> +
> + if (!mrp)
> + return -EINVAL;
> +
> + if (mrp->in_state == BR_MRP_IN_STATE_CLOSED &&
> + state->in_state != BR_MRP_IN_STATE_CLOSED)
> + mrp->in_transitions++;
> +
> + mrp->in_state = state->in_state;
> +
> + br_mrp_switchdev_set_in_state(br, mrp, state->in_state);
> +
> + return 0;
> +}
> +
> +/* Set in role, in role can be only MIM(Media Interconnection Manager) or
> + * MIC(Media Interconnection Client).
> + * note: already called with rtnl_lock
> + */
> +int br_mrp_set_in_role(struct net_bridge *br, struct br_mrp_in_role *role)
> +{
> + struct br_mrp *mrp = br_mrp_find_id(br, role->ring_id);
> + struct net_bridge_port *p;
> + int err;
> +
> + if (!mrp)
> + return -EINVAL;
> +
> + if (!br_mrp_get_port(br, role->i_ifindex))
> + return -EINVAL;
> +
> + if (role->in_role == BR_MRP_IN_ROLE_DISABLED) {
> + u8 state;
> +
> + /* It is not allowed to disable a port that doesn't exist */
> + p = rtnl_dereference(mrp->i_port);
> + if (!p)
> + return -EINVAL;
> +
> + /* Stop the generating MRP_InTest frames */
> + cancel_delayed_work_sync(&mrp->in_test_work);
> + br_mrp_switchdev_send_in_test(br, mrp, 0, 0, 0);
> +
> + /* Remove the port */
> + spin_lock_bh(&br->lock);
> + state = netif_running(br->dev) ?
> + BR_STATE_FORWARDING : BR_STATE_DISABLED;
> + p->state = state;
> + p->flags &= ~BR_MRP_AWARE;
> + spin_unlock_bh(&br->lock);
> + br_mrp_port_switchdev_set_state(p, state);
> + rcu_assign_pointer(mrp->i_port, NULL);
> +
> + mrp->in_role = role->in_role;
> + mrp->in_id = 0;
> +
> + return 0;
> + }
> +
> + /* It is not possible to have the same port part of multiple rings */
> + if (!br_mrp_unique_ifindex(br, role->i_ifindex))
> + return -EINVAL;
> +
> + /* It is not allowed to set a different interconnect port if the mrp
> + * instance has already one. First it needs to be disabled and after
> + * that set the new port
> + */
> + if (rcu_access_pointer(mrp->i_port))
> + return -EINVAL;
> +
> + p = br_mrp_get_port(br, role->i_ifindex);
> + spin_lock_bh(&br->lock);
> + p->state = BR_STATE_FORWARDING;
> + p->flags |= BR_MRP_AWARE;
> + spin_unlock_bh(&br->lock);
> + rcu_assign_pointer(mrp->i_port, p);
> +
> + mrp->in_role = role->in_role;
> + mrp->in_id = role->in_id;
> +
> + /* If there is an error just bailed out */
> + err = br_mrp_switchdev_set_in_role(br, mrp, role->in_id,
> + role->ring_id, role->in_role);
> + if (err && err != -EOPNOTSUPP)
> + return err;
> +
> + /* Now detect if the HW actually applied the role or not. If the HW
> + * applied the role it means that the SW will not to do those operations
> + * anymore. For example if the role is MIM then the HW will notify the
> + * SW when interconnect ring is open, but if the is not pushed to the HW
> + * the SW will need to detect when the interconnect ring is open.
> + */
> + mrp->in_role_offloaded = err == -EOPNOTSUPP ? 0 : 1;
> +
> + return 0;
> +}
> +
> +/* Start to generate MRP_InTest frames, the frames are generated by
> + * HW and if it fails, they are generated by the SW.
> + * note: already called with rtnl_lock
> + */
> +int br_mrp_start_in_test(struct net_bridge *br,
> + struct br_mrp_start_in_test *in_test)
> +{
> + struct br_mrp *mrp = br_mrp_find_in_id(br, in_test->in_id);
> +
> + if (!mrp)
> + return -EINVAL;
> +
> + if (mrp->in_role != BR_MRP_IN_ROLE_MIM)
> + return -EINVAL;
> +
> + /* Try to push it to the HW and if it fails then continue with SW
> + * implementation and if that also fails then return error.
> + */
> + if (!br_mrp_switchdev_send_in_test(br, mrp, in_test->interval,
> + in_test->max_miss, in_test->period))
> + return 0;
> +
> + mrp->in_test_interval = in_test->interval;
> + mrp->in_test_end = jiffies + usecs_to_jiffies(in_test->period);
> + mrp->in_test_max_miss = in_test->max_miss;
> + mrp->in_test_count_miss = 0;
> + queue_delayed_work(system_wq, &mrp->in_test_work,
> + usecs_to_jiffies(in_test->interval));
> +
> + return 0;
> +}
> +
> +/* Determin if the frame type is a ring frame */
> +static bool br_mrp_ring_frame(struct sk_buff *skb)
> +{
> + const struct br_mrp_tlv_hdr *hdr;
> + struct br_mrp_tlv_hdr _hdr;
> +
> + hdr = skb_header_pointer(skb, sizeof(uint16_t), sizeof(_hdr), &_hdr);
> + if (!hdr)
> + return false;
> +
> + if (hdr->type == BR_MRP_TLV_HEADER_RING_TEST ||
> + hdr->type == BR_MRP_TLV_HEADER_RING_TOPO ||
> + hdr->type == BR_MRP_TLV_HEADER_RING_LINK_DOWN ||
> + hdr->type == BR_MRP_TLV_HEADER_RING_LINK_UP ||
> + hdr->type == BR_MRP_TLV_HEADER_OPTION)
> + return true;
> +
> + return false;
> +}
> +
> +/* Determin if the frame type is an interconnect frame */
> +static bool br_mrp_in_frame(struct sk_buff *skb)
> +{
> + const struct br_mrp_tlv_hdr *hdr;
> + struct br_mrp_tlv_hdr _hdr;
> +
> + hdr = skb_header_pointer(skb, sizeof(uint16_t), sizeof(_hdr), &_hdr);
> + if (!hdr)
> + return false;
> +
> + if (hdr->type == BR_MRP_TLV_HEADER_IN_TEST ||
> + hdr->type == BR_MRP_TLV_HEADER_IN_TOPO ||
> + hdr->type == BR_MRP_TLV_HEADER_IN_LINK_DOWN ||
> + hdr->type == BR_MRP_TLV_HEADER_IN_LINK_UP)
> + return true;
> +
> + return false;
> +}
> +
> /* Process only MRP Test frame. All the other MRP frames are processed by
> * userspace application
> * note: already called with rcu_read_lock
> @@ -591,17 +931,92 @@ static void br_mrp_mra_process(struct br_mrp *mrp, struct net_bridge *br,
> mrp->test_count_miss = 0;
> }
>
> -/* This will just forward the frame to the other mrp ring port(MRC role) or will
> - * not do anything.
> +/* Process only MRP InTest frame. All the other MRP frames are processed by
> + * userspace application
> + * note: already called with rcu_read_lock
> + */
> +static bool br_mrp_mim_process(struct br_mrp *mrp, struct net_bridge_port *port,
> + struct sk_buff *skb)
> +{
> + const struct br_mrp_in_test_hdr *in_hdr;
> + struct br_mrp_in_test_hdr _in_hdr;
> + const struct br_mrp_tlv_hdr *hdr;
> + struct br_mrp_tlv_hdr _hdr;
> +
> + /* Each MRP header starts with a version field which is 16 bits.
> + * Therefore skip the version and get directly the TLV header.
> + */
> + hdr = skb_header_pointer(skb, sizeof(uint16_t), sizeof(_hdr), &_hdr);
> + if (!hdr)
> + return false;
> +
> + /* The check for InTest frame type was already done */
> + in_hdr = skb_header_pointer(skb, sizeof(uint16_t) + sizeof(_hdr),
> + sizeof(_in_hdr), &_in_hdr);
> + if (!in_hdr)
> + return false;
> +
> + /* It needs to process only it's own InTest frames. */
> + if (mrp->in_id != ntohs(in_hdr->id))
> + return false;
> +
> + mrp->in_test_count_miss = 0;
> +
> + /* Notify the userspace that the ring is closed only when the ring is
> + * not closed
> + */
> + if (mrp->in_state != BR_MRP_IN_STATE_CLOSED)
> + br_mrp_in_port_open(port->dev, false);
> +
> + return true;
> +}
> +
> +/* Get the MRP frame type
> + * note: already called with rcu_read_lock
> + */
> +static u8 br_mrp_get_frame_type(struct sk_buff *skb)
> +{
> + const struct br_mrp_tlv_hdr *hdr;
> + struct br_mrp_tlv_hdr _hdr;
> +
> + /* Each MRP header starts with a version field which is 16 bits.
> + * Therefore skip the version and get directly the TLV header.
> + */
> + hdr = skb_header_pointer(skb, sizeof(uint16_t), sizeof(_hdr), &_hdr);
> + if (!hdr)
> + return 0xff;
> +
> + return hdr->type;
> +}
> +
> +static bool br_mrp_mrm_behaviour(struct br_mrp *mrp)
> +{
> + if (mrp->ring_role == BR_MRP_RING_ROLE_MRM ||
> + (mrp->ring_role == BR_MRP_RING_ROLE_MRA && !mrp->test_monitor))
> + return true;
> +
> + return false;
> +}
> +
> +static bool br_mrp_mrc_behaviour(struct br_mrp *mrp)
> +{
> + if (mrp->ring_role == BR_MRP_RING_ROLE_MRC ||
> + (mrp->ring_role == BR_MRP_RING_ROLE_MRA && mrp->test_monitor))
> + return true;
> +
> + return false;
> +}
> +
> +/* This will just forward the frame to the other mrp ring ports, depending on
> + * the frame type, ring role and interconnect role
> * note: already called with rcu_read_lock
> */
> static int br_mrp_rcv(struct net_bridge_port *p,
> struct sk_buff *skb, struct net_device *dev)
> {
> - struct net_device *s_dev, *p_dev, *d_dev;
> - struct net_bridge_port *p_port, *s_port;
> + struct net_bridge_port *p_port, *s_port, *i_port = NULL;
> + struct net_bridge_port *p_dst, *s_dst, *i_dst = NULL;
> struct net_bridge *br;
> - struct sk_buff *nskb;
> struct br_mrp *mrp;
>
> /* If port is disabled don't accept any frames */
> @@ -616,46 +1031,139 @@ static int br_mrp_rcv(struct net_bridge_port *p,
> p_port = rcu_dereference(mrp->p_port);
> if (!p_port)
> return 0;
> + p_dst = p_port;
>
> s_port = rcu_dereference(mrp->s_port);
> if (!s_port)
> return 0;
> + s_dst = s_port;
>
> - /* If the role is MRM then don't forward the frames */
> - if (mrp->ring_role == BR_MRP_RING_ROLE_MRM) {
> - br_mrp_mrm_process(mrp, p, skb);
> - return 1;
> - }
> -
> - /* If the role is MRA then don't forward the frames if it behaves as
> - * MRM node
> + /* If the frame is a ring frame then it is not required to check the
> + * interconnect role and ports to process or forward the frame
> */
> - if (mrp->ring_role == BR_MRP_RING_ROLE_MRA) {
> - if (!mrp->test_monitor) {
> + if (br_mrp_ring_frame(skb)) {
> + /* If the role is MRM then don't forward the frames */
> + if (mrp->ring_role == BR_MRP_RING_ROLE_MRM) {
> br_mrp_mrm_process(mrp, p, skb);
> - return 1;
> + goto no_forward;
> }
>
> - br_mrp_mra_process(mrp, br, p, skb);
> + /* If the role is MRA then don't forward the frames if it
> + * behaves as MRM node
> + */
> + if (mrp->ring_role == BR_MRP_RING_ROLE_MRA) {
> + if (!mrp->test_monitor) {
> + br_mrp_mrm_process(mrp, p, skb);
> + goto no_forward;
> + }
> +
> + br_mrp_mra_process(mrp, br, p, skb);
> + }
> +
> + goto forward;
> }
>
> - /* Clone the frame and forward it on the other MRP port */
> - nskb = skb_clone(skb, GFP_ATOMIC);
> - if (!nskb)
> - return 0;
> + if (br_mrp_in_frame(skb)) {
> + u8 in_type = br_mrp_get_frame_type(skb);
>
> - p_dev = p_port->dev;
> - s_dev = s_port->dev;
> + i_port = rcu_dereference(mrp->i_port);
> + i_dst = i_port;
>
> - if (p_dev == dev)
> - d_dev = s_dev;
> - else
> - d_dev = p_dev;
> + /* If the ring port is in block state it should not forward
> + * In_Test frames
> + */
> + if (br_mrp_is_ring_port(p_port, s_port, p) &&
> + p->state == BR_STATE_BLOCKING &&
> + in_type == BR_MRP_TLV_HEADER_IN_TEST)
> + goto no_forward;
> +
> + /* Nodes that behaves as MRM needs to stop forwarding the
> + * frames in case the ring is closed, otherwise will be a loop.
> + * In this case the frame is no forward between the ring ports.
> + */
> + if (br_mrp_mrm_behaviour(mrp) &&
> + br_mrp_is_ring_port(p_port, s_port, p) &&
> + (s_port->state != BR_STATE_FORWARDING ||
> + p_port->state != BR_STATE_FORWARDING)) {
> + p_dst = NULL;
> + s_dst = NULL;
> + }
> +
> + /* A node that behaves as MRC and doesn't have a interconnect
> + * role then it should forward all frames between the ring ports
> + * because it doesn't have an interconnect port
> + */
> + if (br_mrp_mrc_behaviour(mrp) &&
> + mrp->in_role == BR_MRP_IN_ROLE_DISABLED)
> + goto forward;
> +
> + if (mrp->in_role == BR_MRP_IN_ROLE_MIM) {
> + if (in_type == BR_MRP_TLV_HEADER_IN_TEST) {
> + /* MIM should not forward it's own InTest
> + * frames
> + */
> + if (br_mrp_mim_process(mrp, p, skb)) {
> + goto no_forward;
> + } else {
> + if (br_mrp_is_ring_port(p_port, s_port,
> + p))
> + i_dst = NULL;
> +
> + if (br_mrp_is_in_port(i_port, p))
> + goto no_forward;
> + }
> + } else {
> + /* MIM should forward IntLinkChange and
> + * IntTopoChange between ring ports but MIM
> + * should not forward IntLinkChange and
> + * IntTopoChange if the frame was received at
> + * the interconnect port
> + */
> + if (br_mrp_is_ring_port(p_port, s_port, p))
> + i_dst = NULL;
> +
> + if (br_mrp_is_in_port(i_port, p))
> + goto no_forward;
> + }
> + }
> +
> + if (mrp->in_role == BR_MRP_IN_ROLE_MIC) {
> + /* MIC should forward InTest frames on all ports
> + * regardless of the received port
> + */
> + if (in_type == BR_MRP_TLV_HEADER_IN_TEST)
> + goto forward;
> +
> + /* MIC should forward IntLinkChange frames only if they
> + * are received on ring ports to all the ports
> + */
> + if (br_mrp_is_ring_port(p_port, s_port, p) &&
> + (in_type == BR_MRP_TLV_HEADER_IN_LINK_UP ||
> + in_type == BR_MRP_TLV_HEADER_IN_LINK_DOWN))
> + goto forward;
> +
> + /* Should forward the InTopo frames only between the
> + * ring ports
> + */
> + if (in_type == BR_MRP_TLV_HEADER_IN_TOPO) {
> + i_dst = NULL;
> + goto forward;
> + }
> +
> + /* In all the other cases don't forward the frames */
> + goto no_forward;
> + }
> + }
>
> - nskb->dev = d_dev;
> - skb_push(nskb, ETH_HLEN);
> - dev_queue_xmit(nskb);
> +forward:
> + if (p_dst)
> + br_forward(p_dst, skb, true, false);
> + if (s_dst)
> + br_forward(s_dst, skb, true, false);
> + if (i_dst)
> + br_forward(i_dst, skb, true, false);
>
> +no_forward:
> return 1;
> }
>
> diff --git a/net/bridge/br_private_mrp.h b/net/bridge/br_private_mrp.h
> index 0d554ef88db85..af0e9eff65493 100644
> --- a/net/bridge/br_private_mrp.h
> +++ b/net/bridge/br_private_mrp.h
> @@ -57,6 +57,10 @@ int br_mrp_set_ring_state(struct net_bridge *br,
> struct br_mrp_ring_state *state);
> int br_mrp_set_ring_role(struct net_bridge *br, struct br_mrp_ring_role *role);
> int br_mrp_start_test(struct net_bridge *br, struct br_mrp_start_test *test);
> +int br_mrp_set_in_state(struct net_bridge *br, struct br_mrp_in_state *state);
> +int br_mrp_set_in_role(struct net_bridge *br, struct br_mrp_in_role *role);
> +int br_mrp_start_in_test(struct net_bridge *br,
> + struct br_mrp_start_in_test *test);
>
> /* br_mrp_switchdev.c */
> int br_mrp_switchdev_add(struct net_bridge *br, struct br_mrp *mrp);
>

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