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Message-ID: <87edm3vh4k.fsf@nvidia.com>
Date: Thu, 22 Jun 2023 14:53:45 +0300
From: Vlad Buslov <vladbu@...dia.com>
To: Tony Nguyen <anthony.l.nguyen@...el.com>
CC: <davem@...emloft.net>, <kuba@...nel.org>, <pabeni@...hat.com>,
<edumazet@...gle.com>, <netdev@...r.kernel.org>, Wojciech Drewek
<wojciech.drewek@...el.com>, <jiri@...nulli.us>, <ivecera@...hat.com>,
<simon.horman@...igine.com>, Sujai Buvaneswaran
<sujai.buvaneswaran@...el.com>
Subject: Re: [PATCH net-next 07/12] ice: Switchdev FDB events support
On Tue 20 Jun 2023 at 10:44, Tony Nguyen <anthony.l.nguyen@...el.com> wrote:
> From: Wojciech Drewek <wojciech.drewek@...el.com>
>
> Listen for SWITCHDEV_FDB_{ADD|DEL}_TO_DEVICE events while in switchdev
> mode. Accept these events on both uplink and VF PR ports. Add HW
> rules in newly created workqueue. FDB entries are stored in rhashtable
> for lookup when removing the entry and in the list for cleanup
> purpose. Direction of the HW rule depends on the type of the ports
> on which the FDB event was received:
>
> ICE_ESWITCH_BR_UPLINK_PORT:
> TX rule that forwards the packet to the LAN (egress).
>
> ICE_ESWITCH_BR_VF_REPR_PORT:
> RX rule that forwards the packet to the VF associated
> with the port representor.
Just to clarify, does this implementation support offloading of VF-to-VF
traffic?
>
> In both cases the rule matches on the dst mac address.
> All the FDB entries are stored in the bridge structure.
> When the port is removed all the FDB entries associated with
> this port are removed as well. This is achieved thanks to the reference
> to the port that FDB entry holds.
>
> In the fwd rule we use only one lookup type (MAC address)
> but lkups_cnt variable is already introduced because
> we will have more lookups in the subsequent patches.
>
> Signed-off-by: Wojciech Drewek <wojciech.drewek@...el.com>
> Tested-by: Sujai Buvaneswaran <sujai.buvaneswaran@...el.com>
> Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
> ---
> .../net/ethernet/intel/ice/ice_eswitch_br.c | 439 +++++++++++++++++-
> .../net/ethernet/intel/ice/ice_eswitch_br.h | 46 ++
> 2 files changed, 484 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/intel/ice/ice_eswitch_br.c b/drivers/net/ethernet/intel/ice/ice_eswitch_br.c
> index 8b9ab68dfd53..8f22da490a69 100644
> --- a/drivers/net/ethernet/intel/ice/ice_eswitch_br.c
> +++ b/drivers/net/ethernet/intel/ice/ice_eswitch_br.c
> @@ -4,6 +4,14 @@
> #include "ice.h"
> #include "ice_eswitch_br.h"
> #include "ice_repr.h"
> +#include "ice_switch.h"
> +
> +static const struct rhashtable_params ice_fdb_ht_params = {
> + .key_offset = offsetof(struct ice_esw_br_fdb_entry, data),
> + .key_len = sizeof(struct ice_esw_br_fdb_data),
> + .head_offset = offsetof(struct ice_esw_br_fdb_entry, ht_node),
> + .automatic_shrinking = true,
> +};
>
> static bool ice_eswitch_br_is_dev_valid(const struct net_device *dev)
> {
> @@ -27,15 +35,412 @@ ice_eswitch_br_netdev_to_port(struct net_device *dev)
> return NULL;
> }
>
> +static void
> +ice_eswitch_br_ingress_rule_setup(struct ice_adv_rule_info *rule_info,
> + u8 pf_id, u16 vf_vsi_idx)
> +{
> + rule_info->sw_act.vsi_handle = vf_vsi_idx;
> + rule_info->sw_act.flag |= ICE_FLTR_RX;
> + rule_info->sw_act.src = pf_id;
> + rule_info->priority = 5;
> +}
> +
> +static void
> +ice_eswitch_br_egress_rule_setup(struct ice_adv_rule_info *rule_info,
> + u16 pf_vsi_idx)
> +{
> + rule_info->sw_act.vsi_handle = pf_vsi_idx;
> + rule_info->sw_act.flag |= ICE_FLTR_TX;
> + rule_info->flags_info.act = ICE_SINGLE_ACT_LAN_ENABLE;
> + rule_info->flags_info.act_valid = true;
> + rule_info->priority = 5;
> +}
> +
> +static int
> +ice_eswitch_br_rule_delete(struct ice_hw *hw, struct ice_rule_query_data *rule)
> +{
> + int err;
> +
> + if (!rule)
> + return -EINVAL;
> +
> + err = ice_rem_adv_rule_by_id(hw, rule);
> + kfree(rule);
> +
> + return err;
> +}
> +
> +static struct ice_rule_query_data *
> +ice_eswitch_br_fwd_rule_create(struct ice_hw *hw, int vsi_idx, int port_type,
> + const unsigned char *mac)
> +{
> + struct ice_adv_rule_info rule_info = { 0 };
> + struct ice_rule_query_data *rule;
> + struct ice_adv_lkup_elem *list;
> + u16 lkups_cnt = 1;
> + int err;
> +
> + rule = kzalloc(sizeof(*rule), GFP_KERNEL);
> + if (!rule)
> + return ERR_PTR(-ENOMEM);
> +
> + list = kcalloc(lkups_cnt, sizeof(*list), GFP_ATOMIC);
> + if (!list) {
> + err = -ENOMEM;
> + goto err_list_alloc;
> + }
> +
> + switch (port_type) {
> + case ICE_ESWITCH_BR_UPLINK_PORT:
> + ice_eswitch_br_egress_rule_setup(&rule_info, vsi_idx);
> + break;
> + case ICE_ESWITCH_BR_VF_REPR_PORT:
> + ice_eswitch_br_ingress_rule_setup(&rule_info, hw->pf_id,
> + vsi_idx);
> + break;
> + default:
> + err = -EINVAL;
> + goto err_add_rule;
> + }
> +
> + list[0].type = ICE_MAC_OFOS;
> + ether_addr_copy(list[0].h_u.eth_hdr.dst_addr, mac);
> + eth_broadcast_addr(list[0].m_u.eth_hdr.dst_addr);
> +
> + rule_info.sw_act.fltr_act = ICE_FWD_TO_VSI;
> +
> + err = ice_add_adv_rule(hw, list, lkups_cnt, &rule_info, rule);
> + if (err)
> + goto err_add_rule;
> +
> + kfree(list);
> +
> + return rule;
> +
> +err_add_rule:
> + kfree(list);
> +err_list_alloc:
> + kfree(rule);
> +
> + return ERR_PTR(err);
> +}
> +
> +static struct ice_esw_br_flow *
> +ice_eswitch_br_flow_create(struct device *dev, struct ice_hw *hw, int vsi_idx,
> + int port_type, const unsigned char *mac)
> +{
> + struct ice_rule_query_data *fwd_rule;
> + struct ice_esw_br_flow *flow;
> + int err;
> +
> + flow = kzalloc(sizeof(*flow), GFP_KERNEL);
> + if (!flow)
> + return ERR_PTR(-ENOMEM);
> +
> + fwd_rule = ice_eswitch_br_fwd_rule_create(hw, vsi_idx, port_type, mac);
> + err = PTR_ERR_OR_ZERO(fwd_rule);
> + if (err) {
> + dev_err(dev, "Failed to create eswitch bridge %sgress forward rule, err: %d\n",
> + port_type == ICE_ESWITCH_BR_UPLINK_PORT ? "e" : "in",
> + err);
> + goto err_fwd_rule;
> + }
> +
> + flow->fwd_rule = fwd_rule;
> +
> + return flow;
> +
> +err_fwd_rule:
> + kfree(flow);
> +
> + return ERR_PTR(err);
> +}
> +
> +static struct ice_esw_br_fdb_entry *
> +ice_eswitch_br_fdb_find(struct ice_esw_br *bridge, const unsigned char *mac,
> + u16 vid)
> +{
> + struct ice_esw_br_fdb_data data = {
> + .vid = vid,
> + };
> +
> + ether_addr_copy(data.addr, mac);
> + return rhashtable_lookup_fast(&bridge->fdb_ht, &data,
> + ice_fdb_ht_params);
> +}
> +
> +static void
> +ice_eswitch_br_flow_delete(struct ice_pf *pf, struct ice_esw_br_flow *flow)
> +{
> + struct device *dev = ice_pf_to_dev(pf);
> + int err;
> +
> + err = ice_eswitch_br_rule_delete(&pf->hw, flow->fwd_rule);
> + if (err)
> + dev_err(dev, "Failed to delete FDB forward rule, err: %d\n",
> + err);
> +
> + kfree(flow);
> +}
> +
> +static void
> +ice_eswitch_br_fdb_entry_delete(struct ice_esw_br *bridge,
> + struct ice_esw_br_fdb_entry *fdb_entry)
> +{
> + struct ice_pf *pf = bridge->br_offloads->pf;
> +
> + rhashtable_remove_fast(&bridge->fdb_ht, &fdb_entry->ht_node,
> + ice_fdb_ht_params);
> + list_del(&fdb_entry->list);
> +
> + ice_eswitch_br_flow_delete(pf, fdb_entry->flow);
> +
> + kfree(fdb_entry);
> +}
> +
> +static void
> +ice_eswitch_br_fdb_offload_notify(struct net_device *dev,
> + const unsigned char *mac, u16 vid,
> + unsigned long val)
> +{
> + struct switchdev_notifier_fdb_info fdb_info = {
> + .addr = mac,
> + .vid = vid,
> + .offloaded = true,
> + };
> +
> + call_switchdev_notifiers(val, dev, &fdb_info.info, NULL);
> +}
> +
> +static void
> +ice_eswitch_br_fdb_entry_notify_and_cleanup(struct ice_esw_br *bridge,
> + struct ice_esw_br_fdb_entry *entry)
> +{
> + if (!(entry->flags & ICE_ESWITCH_BR_FDB_ADDED_BY_USER))
> + ice_eswitch_br_fdb_offload_notify(entry->dev, entry->data.addr,
> + entry->data.vid,
> + SWITCHDEV_FDB_DEL_TO_BRIDGE);
> + ice_eswitch_br_fdb_entry_delete(bridge, entry);
> +}
> +
> +static void
> +ice_eswitch_br_fdb_entry_find_and_delete(struct ice_esw_br *bridge,
> + const unsigned char *mac, u16 vid)
> +{
> + struct ice_pf *pf = bridge->br_offloads->pf;
> + struct ice_esw_br_fdb_entry *fdb_entry;
> + struct device *dev = ice_pf_to_dev(pf);
> +
> + fdb_entry = ice_eswitch_br_fdb_find(bridge, mac, vid);
> + if (!fdb_entry) {
> + dev_err(dev, "FDB entry with mac: %pM and vid: %u not found\n",
> + mac, vid);
> + return;
> + }
> +
> + ice_eswitch_br_fdb_entry_notify_and_cleanup(bridge, fdb_entry);
> +}
> +
> +static void
> +ice_eswitch_br_fdb_entry_create(struct net_device *netdev,
> + struct ice_esw_br_port *br_port,
> + bool added_by_user,
> + const unsigned char *mac, u16 vid)
> +{
> + struct ice_esw_br *bridge = br_port->bridge;
> + struct ice_pf *pf = bridge->br_offloads->pf;
> + struct device *dev = ice_pf_to_dev(pf);
> + struct ice_esw_br_fdb_entry *fdb_entry;
> + struct ice_esw_br_flow *flow;
> + struct ice_hw *hw = &pf->hw;
> + unsigned long event;
> + int err;
> +
> + fdb_entry = ice_eswitch_br_fdb_find(bridge, mac, vid);
> + if (fdb_entry)
> + ice_eswitch_br_fdb_entry_notify_and_cleanup(bridge, fdb_entry);
> +
> + fdb_entry = kzalloc(sizeof(*fdb_entry), GFP_KERNEL);
> + if (!fdb_entry) {
> + err = -ENOMEM;
> + goto err_exit;
> + }
> +
> + flow = ice_eswitch_br_flow_create(dev, hw, br_port->vsi_idx,
> + br_port->type, mac);
> + if (IS_ERR(flow)) {
> + err = PTR_ERR(flow);
> + goto err_add_flow;
> + }
> +
> + ether_addr_copy(fdb_entry->data.addr, mac);
> + fdb_entry->data.vid = vid;
> + fdb_entry->br_port = br_port;
> + fdb_entry->flow = flow;
> + fdb_entry->dev = netdev;
> + event = SWITCHDEV_FDB_ADD_TO_BRIDGE;
> +
> + if (added_by_user) {
> + fdb_entry->flags |= ICE_ESWITCH_BR_FDB_ADDED_BY_USER;
> + event = SWITCHDEV_FDB_OFFLOADED;
> + }
> +
> + err = rhashtable_insert_fast(&bridge->fdb_ht, &fdb_entry->ht_node,
> + ice_fdb_ht_params);
> + if (err)
> + goto err_fdb_insert;
> +
> + list_add(&fdb_entry->list, &bridge->fdb_list);
> +
> + ice_eswitch_br_fdb_offload_notify(netdev, mac, vid, event);
> +
> + return;
> +
> +err_fdb_insert:
> + ice_eswitch_br_flow_delete(pf, flow);
> +err_add_flow:
> + kfree(fdb_entry);
> +err_exit:
> + dev_err(dev, "Failed to create fdb entry, err: %d\n", err);
> +}
> +
> +static void
> +ice_eswitch_br_fdb_work_dealloc(struct ice_esw_br_fdb_work *fdb_work)
> +{
> + kfree(fdb_work->fdb_info.addr);
> + kfree(fdb_work);
> +}
> +
> +static void
> +ice_eswitch_br_fdb_event_work(struct work_struct *work)
> +{
> + struct ice_esw_br_fdb_work *fdb_work = ice_work_to_fdb_work(work);
> + bool added_by_user = fdb_work->fdb_info.added_by_user;
> + struct ice_esw_br_port *br_port = fdb_work->br_port;
> + const unsigned char *mac = fdb_work->fdb_info.addr;
> + u16 vid = fdb_work->fdb_info.vid;
> +
> + rtnl_lock();
> +
> + if (!br_port || !br_port->bridge)
> + goto err_exit;
> +
> + switch (fdb_work->event) {
> + case SWITCHDEV_FDB_ADD_TO_DEVICE:
> + ice_eswitch_br_fdb_entry_create(fdb_work->dev, br_port,
> + added_by_user, mac, vid);
> + break;
> + case SWITCHDEV_FDB_DEL_TO_DEVICE:
> + ice_eswitch_br_fdb_entry_find_and_delete(br_port->bridge,
> + mac, vid);
> + break;
> + default:
> + goto err_exit;
> + }
> +
> +err_exit:
> + rtnl_unlock();
> + dev_put(fdb_work->dev);
> + ice_eswitch_br_fdb_work_dealloc(fdb_work);
> +}
> +
> +static struct ice_esw_br_fdb_work *
> +ice_eswitch_br_fdb_work_alloc(struct switchdev_notifier_fdb_info *fdb_info,
> + struct ice_esw_br_port *br_port,
> + struct net_device *dev,
> + unsigned long event)
> +{
> + struct ice_esw_br_fdb_work *work;
> + unsigned char *mac;
> +
> + work = kzalloc(sizeof(*work), GFP_ATOMIC);
> + if (!work)
> + return ERR_PTR(-ENOMEM);
> +
> + INIT_WORK(&work->work, ice_eswitch_br_fdb_event_work);
> + memcpy(&work->fdb_info, fdb_info, sizeof(work->fdb_info));
> +
> + mac = kzalloc(ETH_ALEN, GFP_ATOMIC);
> + if (!mac) {
> + kfree(work);
> + return ERR_PTR(-ENOMEM);
> + }
> +
> + ether_addr_copy(mac, fdb_info->addr);
> + work->fdb_info.addr = mac;
> + work->br_port = br_port;
> + work->event = event;
> + work->dev = dev;
> +
> + return work;
> +}
> +
> +static int
> +ice_eswitch_br_switchdev_event(struct notifier_block *nb,
> + unsigned long event, void *ptr)
> +{
> + struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
> + struct switchdev_notifier_fdb_info *fdb_info;
> + struct switchdev_notifier_info *info = ptr;
> + struct ice_esw_br_offloads *br_offloads;
> + struct ice_esw_br_fdb_work *work;
> + struct ice_esw_br_port *br_port;
> + struct netlink_ext_ack *extack;
> + struct net_device *upper;
> +
> + br_offloads = ice_nb_to_br_offloads(nb, switchdev_nb);
> + extack = switchdev_notifier_info_to_extack(ptr);
> +
> + upper = netdev_master_upper_dev_get_rcu(dev);
> + if (!upper)
> + return NOTIFY_DONE;
> +
> + if (!netif_is_bridge_master(upper))
> + return NOTIFY_DONE;
> +
> + if (!ice_eswitch_br_is_dev_valid(dev))
> + return NOTIFY_DONE;
> +
> + br_port = ice_eswitch_br_netdev_to_port(dev);
> + if (!br_port)
> + return NOTIFY_DONE;
> +
> + switch (event) {
> + case SWITCHDEV_FDB_ADD_TO_DEVICE:
> + case SWITCHDEV_FDB_DEL_TO_DEVICE:
> + fdb_info = container_of(info, typeof(*fdb_info), info);
> +
> + work = ice_eswitch_br_fdb_work_alloc(fdb_info, br_port, dev,
> + event);
> + if (IS_ERR(work)) {
> + NL_SET_ERR_MSG_MOD(extack, "Failed to init switchdev fdb work");
> + return notifier_from_errno(PTR_ERR(work));
> + }
> + dev_hold(dev);
> +
> + queue_work(br_offloads->wq, &work->work);
> + break;
> + default:
> + break;
> + }
> + return NOTIFY_DONE;
> +}
> +
> static void
> ice_eswitch_br_port_deinit(struct ice_esw_br *bridge,
> struct ice_esw_br_port *br_port)
> {
> + struct ice_esw_br_fdb_entry *fdb_entry, *tmp;
> struct ice_vsi *vsi = br_port->vsi;
>
> + list_for_each_entry_safe(fdb_entry, tmp, &bridge->fdb_list, list) {
> + if (br_port == fdb_entry->br_port)
> + ice_eswitch_br_fdb_entry_delete(bridge, fdb_entry);
> + }
> +
> if (br_port->type == ICE_ESWITCH_BR_UPLINK_PORT && vsi->back)
> vsi->back->br_port = NULL;
> - else if (vsi->vf)
> + else if (vsi->vf && vsi->vf->repr)
Shouldn't this check be in the previous patch? Don't see anything that
would influence this pointer assignment in this patch.
> vsi->vf->repr->br_port = NULL;
>
> xa_erase(&bridge->ports, br_port->vsi_idx);
> @@ -129,6 +534,8 @@ ice_eswitch_br_deinit(struct ice_esw_br_offloads *br_offloads,
> ice_eswitch_br_ports_flush(bridge);
> WARN_ON(!xa_empty(&bridge->ports));
> xa_destroy(&bridge->ports);
> + rhashtable_destroy(&bridge->fdb_ht);
> +
> br_offloads->bridge = NULL;
> kfree(bridge);
> }
> @@ -137,11 +544,19 @@ static struct ice_esw_br *
> ice_eswitch_br_init(struct ice_esw_br_offloads *br_offloads, int ifindex)
> {
> struct ice_esw_br *bridge;
> + int err;
>
> bridge = kzalloc(sizeof(*bridge), GFP_KERNEL);
> if (!bridge)
> return ERR_PTR(-ENOMEM);
>
> + err = rhashtable_init(&bridge->fdb_ht, &ice_fdb_ht_params);
> + if (err) {
> + kfree(bridge);
> + return ERR_PTR(err);
> + }
> +
> + INIT_LIST_HEAD(&bridge->fdb_list);
> bridge->br_offloads = br_offloads;
> bridge->ifindex = ifindex;
> xa_init(&bridge->ports);
> @@ -340,6 +755,8 @@ ice_eswitch_br_offloads_deinit(struct ice_pf *pf)
> return;
>
> unregister_netdevice_notifier(&br_offloads->netdev_nb);
> + unregister_switchdev_notifier(&br_offloads->switchdev_nb);
> + destroy_workqueue(br_offloads->wq);
> /* Although notifier block is unregistered just before,
> * so we don't get any new events, some events might be
> * already in progress. Hold the rtnl lock and wait for
> @@ -365,6 +782,22 @@ ice_eswitch_br_offloads_init(struct ice_pf *pf)
> return PTR_ERR(br_offloads);
> }
>
> + br_offloads->wq = alloc_ordered_workqueue("ice_bridge_wq", 0);
> + if (!br_offloads->wq) {
> + err = -ENOMEM;
> + dev_err(dev, "Failed to allocate bridge workqueue\n");
> + goto err_alloc_wq;
> + }
> +
> + br_offloads->switchdev_nb.notifier_call =
> + ice_eswitch_br_switchdev_event;
> + err = register_switchdev_notifier(&br_offloads->switchdev_nb);
> + if (err) {
> + dev_err(dev,
> + "Failed to register switchdev notifier\n");
> + goto err_reg_switchdev_nb;
> + }
> +
> br_offloads->netdev_nb.notifier_call = ice_eswitch_br_port_event;
> err = register_netdevice_notifier(&br_offloads->netdev_nb);
> if (err) {
> @@ -376,6 +809,10 @@ ice_eswitch_br_offloads_init(struct ice_pf *pf)
> return 0;
>
> err_reg_netdev_nb:
> + unregister_switchdev_notifier(&br_offloads->switchdev_nb);
> +err_reg_switchdev_nb:
> + destroy_workqueue(br_offloads->wq);
> +err_alloc_wq:
> rtnl_lock();
> ice_eswitch_br_offloads_dealloc(pf);
> rtnl_unlock();
> diff --git a/drivers/net/ethernet/intel/ice/ice_eswitch_br.h b/drivers/net/ethernet/intel/ice/ice_eswitch_br.h
> index 3ad28a17298f..6fcacf545b98 100644
> --- a/drivers/net/ethernet/intel/ice/ice_eswitch_br.h
> +++ b/drivers/net/ethernet/intel/ice/ice_eswitch_br.h
> @@ -4,6 +4,33 @@
> #ifndef _ICE_ESWITCH_BR_H_
> #define _ICE_ESWITCH_BR_H_
>
> +#include <linux/rhashtable.h>
> +
> +struct ice_esw_br_fdb_data {
> + unsigned char addr[ETH_ALEN];
> + u16 vid;
> +};
> +
> +struct ice_esw_br_flow {
> + struct ice_rule_query_data *fwd_rule;
> +};
> +
> +enum {
> + ICE_ESWITCH_BR_FDB_ADDED_BY_USER = BIT(0),
> +};
> +
> +struct ice_esw_br_fdb_entry {
> + struct ice_esw_br_fdb_data data;
> + struct rhash_head ht_node;
> + struct list_head list;
> +
> + int flags;
> +
> + struct net_device *dev;
> + struct ice_esw_br_port *br_port;
> + struct ice_esw_br_flow *flow;
> +};
> +
> enum ice_esw_br_port_type {
> ICE_ESWITCH_BR_UPLINK_PORT = 0,
> ICE_ESWITCH_BR_VF_REPR_PORT = 1,
> @@ -20,6 +47,9 @@ struct ice_esw_br {
> struct ice_esw_br_offloads *br_offloads;
> struct xarray ports;
>
> + struct rhashtable fdb_ht;
> + struct list_head fdb_list;
> +
> int ifindex;
> };
>
> @@ -27,6 +57,17 @@ struct ice_esw_br_offloads {
> struct ice_pf *pf;
> struct ice_esw_br *bridge;
> struct notifier_block netdev_nb;
> + struct notifier_block switchdev_nb;
> +
> + struct workqueue_struct *wq;
> +};
> +
> +struct ice_esw_br_fdb_work {
> + struct work_struct work;
> + struct switchdev_notifier_fdb_info fdb_info;
> + struct ice_esw_br_port *br_port;
> + struct net_device *dev;
> + unsigned long event;
> };
>
> #define ice_nb_to_br_offloads(nb, nb_name) \
> @@ -34,6 +75,11 @@ struct ice_esw_br_offloads {
> struct ice_esw_br_offloads, \
> nb_name)
>
> +#define ice_work_to_fdb_work(w) \
> + container_of(w, \
> + struct ice_esw_br_fdb_work, \
> + work)
> +
> void
> ice_eswitch_br_offloads_deinit(struct ice_pf *pf);
> int
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