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mac80211: rework tx encapsulation offload API

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The current API (which lets the driver turn on/off per vif directly) has a
number of limitations:
- it does not deal with AP_VLAN
- conditions for enabling (no tkip, no monitor) are only checked at
  add_interface time
- no way to indicate 4-addr support

In order to address this, store offload flags in struct ieee80211_vif
(easy to extend for decap offload later). mac80211 initially sets the enable
flag, but gives the driver a chance to modify it before its settings are
applied. In addition to the .add_interface op, a .update_vif_offload op is
introduced, which can be used for runtime changes.

If a driver can't disable encap offload at runtime, or if it has some extra
limitations, it can simply override the flags within those ops.

Support for encap offload with 4-address mode interfaces can be enabled
by setting a flag from .add_interface or .update_vif_offload.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Link: https://lore.kernel.org/r/20200908123702.88454-6-nbd@nbd.name
[resolved conflict with commit aa2092a9ba ("ath11k: add raw mode and
software crypto support")]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Felix Fietkau 2020-09-08 14:36:53 +02:00 committed by Johannes Berg
parent ae04515276
commit 6aea26ce5a
9 changed files with 220 additions and 115 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

61
drivers/net/wireless/ath/ath11k/mac.c
View file

@ -4349,6 +4349,37 @@ static int ath11k_set_he_mu_sounding_mode(struct ath11k *ar,
return ret;
}
static void ath11k_mac_op_update_vif_offload(struct ieee80211_hw *hw,
struct ieee80211_vif *vif)
{
struct ath11k *ar = hw->priv;
struct ath11k_base *ab = ar->ab;
struct ath11k_vif *arvif = ath11k_vif_to_arvif(vif);
u32 param_id, param_value;
int ret;
param_id = WMI_VDEV_PARAM_TX_ENCAP_TYPE;
if (ath11k_frame_mode != ATH11K_HW_TXRX_ETHERNET ||
(vif->type != NL80211_IFTYPE_STATION &&
vif->type != NL80211_IFTYPE_AP))
vif->offload_flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
if (vif->offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED)
param_value = ATH11K_HW_TXRX_ETHERNET;
else if (test_bit(ATH11K_FLAG_RAW_MODE, &ab->dev_flags))
param_value = ATH11K_HW_TXRX_RAW;
else
param_value = ATH11K_HW_TXRX_NATIVE_WIFI;
ret = ath11k_wmi_vdev_set_param_cmd(ar, arvif->vdev_id,
param_id, param_value);
if (ret) {
ath11k_warn(ab, "failed to set vdev %d tx encap mode: %d\n",
arvif->vdev_id, ret);
vif->offload_flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
}
}
static int ath11k_mac_op_add_interface(struct ieee80211_hw *hw,
struct ieee80211_vif *vif)
{
@ -4358,7 +4389,6 @@ static int ath11k_mac_op_add_interface(struct ieee80211_hw *hw,
struct vdev_create_params vdev_param = {0};
struct peer_create_params peer_param;
u32 param_id, param_value;
int hw_encap = 0;
u16 nss;
int i;
int ret;
@ -4452,32 +4482,7 @@ static int ath11k_mac_op_add_interface(struct ieee80211_hw *hw,
list_add(&arvif->list, &ar->arvifs);
spin_unlock_bh(&ar->data_lock);
param_id = WMI_VDEV_PARAM_TX_ENCAP_TYPE;
if (ath11k_frame_mode == ATH11K_HW_TXRX_ETHERNET)
switch (vif->type) {
case NL80211_IFTYPE_STATION:
case NL80211_IFTYPE_AP_VLAN:
case NL80211_IFTYPE_AP:
hw_encap = 1;
break;
default:
break;
}
if (ieee80211_set_hw_80211_encap(vif, hw_encap))
param_value = ATH11K_HW_TXRX_ETHERNET;
else if (test_bit(ATH11K_FLAG_RAW_MODE, &ab->dev_flags))
param_value = ATH11K_HW_TXRX_RAW;
else
param_value = ATH11K_HW_TXRX_NATIVE_WIFI;
ret = ath11k_wmi_vdev_set_param_cmd(ar, arvif->vdev_id,
param_id, param_value);
if (ret) {
ath11k_warn(ab, "failed to set vdev %d tx encap mode: %d\n",
arvif->vdev_id, ret);
goto err_vdev_del;
}
ath11k_mac_op_update_vif_offload(hw, vif);
nss = get_num_chains(ar->cfg_tx_chainmask) ? : 1;
ret = ath11k_wmi_vdev_set_param_cmd(ar, arvif->vdev_id,
@ -5840,6 +5845,7 @@ static const struct ieee80211_ops ath11k_ops = {
.reconfig_complete = ath11k_mac_op_reconfig_complete,
.add_interface = ath11k_mac_op_add_interface,
.remove_interface = ath11k_mac_op_remove_interface,
.update_vif_offload = ath11k_mac_op_update_vif_offload,
.config = ath11k_mac_op_config,
.bss_info_changed = ath11k_mac_op_bss_info_changed,
.configure_filter = ath11k_mac_op_configure_filter,
@ -6148,6 +6154,7 @@ static int __ath11k_mac_register(struct ath11k *ar)
ieee80211_hw_set(ar->hw, QUEUE_CONTROL);
ieee80211_hw_set(ar->hw, SUPPORTS_TX_FRAG);
ieee80211_hw_set(ar->hw, REPORTS_LOW_ACK);
ieee80211_hw_set(ar->hw, SUPPORTS_TX_ENCAP_OFFLOAD);
if (ht_cap & WMI_HT_CAP_ENABLED) {
ieee80211_hw_set(ar->hw, AMPDU_AGGREGATION);
ieee80211_hw_set(ar->hw, TX_AMPDU_SETUP_IN_HW);

29
include/net/mac80211.h
View file

@ -1606,6 +1606,21 @@ enum ieee80211_vif_flags {
IEEE80211_VIF_GET_NOA_UPDATE = BIT(3),
};
/**
* enum ieee80211_offload_flags - virtual interface offload flags
*
* @IEEE80211_OFFLOAD_ENCAP_ENABLED: tx encapsulation offload is enabled
* The driver supports sending frames passed as 802.3 frames by mac80211.
* It must also support sending 802.11 packets for the same interface.
* @IEEE80211_OFFLOAD_ENCAP_4ADDR: support 4-address mode encapsulation offload
*/
enum ieee80211_offload_flags {
IEEE80211_OFFLOAD_ENCAP_ENABLED = BIT(0),
IEEE80211_OFFLOAD_ENCAP_4ADDR = BIT(1),
};
/**
* struct ieee80211_vif - per-interface data
*
@ -1626,6 +1641,11 @@ enum ieee80211_vif_flags {
* these need to be set (or cleared) when the interface is added
* or, if supported by the driver, the interface type is changed
* at runtime, mac80211 will never touch this field
* @offloaad_flags: hardware offload capabilities/flags for this interface.
* These are initialized by mac80211 before calling .add_interface,
* .change_interface or .update_vif_offload and updated by the driver
* within these ops, based on supported features or runtime change
* restrictions.
* @hw_queue: hardware queue for each AC
* @cab_queue: content-after-beacon (DTIM beacon really) queue, AP mode only
* @chanctx_conf: The channel context this interface is assigned to, or %NULL
@ -1662,6 +1682,7 @@ struct ieee80211_vif {
struct ieee80211_chanctx_conf __rcu *chanctx_conf;
u32 driver_flags;
u32 offload_flags;
#ifdef CONFIG_MAC80211_DEBUGFS
struct dentry *debugfs_dir;
@ -2328,6 +2349,9 @@ struct ieee80211_txq {
* aggregating MPDUs with the same keyid, allowing mac80211 to keep Tx
* A-MPDU sessions active while rekeying with Extended Key ID.
*
* @IEEE80211_HW_SUPPORTS_TX_ENCAP_OFFLOAD: Hardware supports tx encapsulation
* offload
*
* @NUM_IEEE80211_HW_FLAGS: number of hardware flags, used for sizing arrays
*/
enum ieee80211_hw_flags {
@ -2380,6 +2404,7 @@ enum ieee80211_hw_flags {
IEEE80211_HW_SUPPORTS_MULTI_BSSID,
IEEE80211_HW_SUPPORTS_ONLY_HE_MULTI_BSSID,
IEEE80211_HW_AMPDU_KEYBORDER_SUPPORT,
IEEE80211_HW_SUPPORTS_TX_ENCAP_OFFLOAD,
/* keep last, obviously */
NUM_IEEE80211_HW_FLAGS
@ -3814,6 +3839,8 @@ enum ieee80211_reconfig_type {
* @set_tid_config: Apply TID specific configurations. This callback may sleep.
* @reset_tid_config: Reset TID specific configuration for the peer.
* This callback may sleep.
* @update_vif_config: Update virtual interface offload flags
* This callback may sleep.
*/
struct ieee80211_ops {
void (*tx)(struct ieee80211_hw *hw,
@ -4125,6 +4152,8 @@ struct ieee80211_ops {
int (*reset_tid_config)(struct ieee80211_hw *hw,
struct ieee80211_vif *vif,
struct ieee80211_sta *sta, u8 tids);
void (*update_vif_offload)(struct ieee80211_hw *hw,
struct ieee80211_vif *vif);
};
/**

1
net/mac80211/debugfs.c
View file

@ -408,6 +408,7 @@ static const char *hw_flag_names[] = {
FLAG(SUPPORTS_MULTI_BSSID),
FLAG(SUPPORTS_ONLY_HE_MULTI_BSSID),
FLAG(AMPDU_KEYBORDER_SUPPORT),
FLAG(SUPPORTS_TX_ENCAP_OFFLOAD),
#undef FLAG
};

15
net/mac80211/driver-ops.h
View file

@ -1384,4 +1384,19 @@ static inline int drv_reset_tid_config(struct ieee80211_local *local,
return ret;
}
static inline void drv_update_vif_offload(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata)
{
might_sleep();
check_sdata_in_driver(sdata);
if (!local->ops->update_vif_offload)
return;
trace_drv_update_vif_offload(local, sdata);
local->ops->update_vif_offload(&local->hw, &sdata->vif);
trace_drv_return_void(local);
}
#endif /* __MAC80211_DRIVER_OPS */

3
net/mac80211/ieee80211_i.h
View file

@ -989,8 +989,6 @@ struct ieee80211_sub_if_data {
} debugfs;
#endif
bool hw_80211_encap;
/* must be last, dynamically sized area in this! */
struct ieee80211_vif vif;
};
@ -1767,6 +1765,7 @@ void ieee80211_del_virtual_monitor(struct ieee80211_local *local);
bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata);
void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
bool update_bss);
void ieee80211_recalc_offload(struct ieee80211_local *local);
static inline bool ieee80211_sdata_running(struct ieee80211_sub_if_data *sdata)
{

169
net/mac80211/iface.c
View file

@ -43,6 +43,7 @@
*/
static void ieee80211_iface_work(struct work_struct *work);
static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata);
bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
{
@ -348,6 +349,85 @@ static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
return 0;
}
static bool ieee80211_iftype_supports_encap_offload(enum nl80211_iftype iftype)
{
switch (iftype) {
/* P2P GO and client are mapped to AP/STATION types */
case NL80211_IFTYPE_AP:
case NL80211_IFTYPE_STATION:
return true;
default:
return false;
}
}
static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_local *local = sdata->local;
u32 flags;
flags = sdata->vif.offload_flags;
if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) &&
ieee80211_iftype_supports_encap_offload(sdata->vif.type)) {
flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED;
if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) &&
local->hw.wiphy->frag_threshold != (u32)-1)
flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
if (local->monitors)
flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
} else {
flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
}
if (sdata->vif.offload_flags == flags)
return false;
sdata->vif.offload_flags = flags;
return true;
}
static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_sub_if_data *vsdata;
if (ieee80211_set_sdata_offload_flags(sdata)) {
drv_update_vif_offload(local, sdata);
ieee80211_set_vif_encap_ops(sdata);
}
list_for_each_entry(vsdata, &local->interfaces, list) {
if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
vsdata->bss != &sdata->u.ap)
continue;
ieee80211_set_vif_encap_ops(vsdata);
}
}
void ieee80211_recalc_offload(struct ieee80211_local *local)
{
struct ieee80211_sub_if_data *sdata;
if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD))
return;
mutex_lock(&local->iflist_mtx);
list_for_each_entry(sdata, &local->interfaces, list) {
if (!ieee80211_sdata_running(sdata))
continue;
ieee80211_recalc_sdata_offload(sdata);
}
mutex_unlock(&local->iflist_mtx);
}
void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
const int offset)
{
@ -587,6 +667,7 @@ int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
if (rtnl_dereference(sdata->bss->beacon)) {
ieee80211_vif_vlan_copy_chanctx(sdata);
netif_carrier_on(dev);
ieee80211_set_vif_encap_ops(sdata);
} else {
netif_carrier_off(dev);
}
@ -616,6 +697,7 @@ int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
ieee80211_adjust_monitor_flags(sdata, 1);
ieee80211_configure_filter(local);
ieee80211_recalc_offload(local);
mutex_lock(&local->mtx);
ieee80211_recalc_idle(local);
mutex_unlock(&local->mtx);
@ -625,10 +707,13 @@ int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
default:
if (coming_up) {
ieee80211_del_virtual_monitor(local);
ieee80211_set_sdata_offload_flags(sdata);
res = drv_add_interface(local, sdata);
if (res)
goto err_stop;
ieee80211_set_vif_encap_ops(sdata);
res = ieee80211_check_queues(sdata,
ieee80211_vif_type_p2p(&sdata->vif));
if (res)
@ -1227,61 +1312,6 @@ static const struct net_device_ops ieee80211_dataif_8023_ops = {
.ndo_get_stats64 = ieee80211_get_stats64,
};
static void __ieee80211_set_hw_80211_encap(struct ieee80211_sub_if_data *sdata,
bool enable)
{
sdata->dev->netdev_ops = enable ? &ieee80211_dataif_8023_ops :
&ieee80211_dataif_ops;
sdata->hw_80211_encap = enable;
}
bool ieee80211_set_hw_80211_encap(struct ieee80211_vif *vif, bool enable)
{
struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
struct ieee80211_local *local = sdata->local;
struct ieee80211_sub_if_data *iter;
struct ieee80211_key *key;
mutex_lock(&local->iflist_mtx);
list_for_each_entry(iter, &local->interfaces, list) {
struct ieee80211_sub_if_data *disable = NULL;
if (vif->type == NL80211_IFTYPE_MONITOR) {
disable = iter;
__ieee80211_set_hw_80211_encap(iter, false);
} else if (iter->vif.type == NL80211_IFTYPE_MONITOR) {
disable = sdata;
enable = false;
}
if (disable)
sdata_dbg(disable,
"disable hw 80211 encap due to mon co-exist\n");
}
mutex_unlock(&local->iflist_mtx);
if (enable == sdata->hw_80211_encap)
return enable;
if (!sdata->dev)
return false;
if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) &&
(local->hw.wiphy->frag_threshold != (u32)-1))
enable = false;
mutex_lock(&sdata->local->key_mtx);
list_for_each_entry(key, &sdata->key_list, list) {
if (key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)
enable = false;
}
mutex_unlock(&sdata->local->key_mtx);
__ieee80211_set_hw_80211_encap(sdata, enable);
return enable;
}
EXPORT_SYMBOL(ieee80211_set_hw_80211_encap);
static void ieee80211_if_free(struct net_device *dev)
{
free_percpu(dev->tstats);
@ -1302,6 +1332,32 @@ static void ieee80211_if_setup_no_queue(struct net_device *dev)
dev->priv_flags |= IFF_NO_QUEUE;
}
static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_sub_if_data *bss = sdata;
bool enabled;
if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
if (!sdata->bss)
return;
bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
}
if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) ||
!ieee80211_iftype_supports_encap_offload(bss->vif.type))
return;
enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED;
if (sdata->wdev.use_4addr &&
!(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR))
enabled = false;
sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops :
&ieee80211_dataif_ops;
}
static void ieee80211_iface_work(struct work_struct *work)
{
struct ieee80211_sub_if_data *sdata =
@ -1484,7 +1540,6 @@ static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
sdata->vif.bss_conf.txpower = INT_MIN; /* unset */
sdata->noack_map = 0;
sdata->hw_80211_encap = false;
/* only monitor/p2p-device differ */
if (sdata->dev) {
@ -1619,6 +1674,7 @@ static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
ieee80211_teardown_sdata(sdata);
ieee80211_set_sdata_offload_flags(sdata);
ret = drv_change_interface(local, sdata, internal_type, p2p);
if (ret)
type = ieee80211_vif_type_p2p(&sdata->vif);
@ -1631,6 +1687,7 @@ static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
ieee80211_check_queues(sdata, type);
ieee80211_setup_sdata(sdata, type);
ieee80211_set_vif_encap_ops(sdata);
err = ieee80211_do_open(&sdata->wdev, false);
WARN(err, "type change: do_open returned %d", err);

15
net/mac80211/key.c
View file

@ -177,13 +177,6 @@ static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
}
}
/* TKIP countermeasures don't work in encap offload mode */
if (key->conf.cipher == WLAN_CIPHER_SUITE_TKIP &&
sdata->hw_80211_encap) {
sdata_dbg(sdata, "TKIP is not allowed in hw 80211 encap mode\n");
return -EINVAL;
}
ret = drv_set_key(key->local, SET_KEY, sdata,
sta ? &sta->sta : NULL, &key->conf);
@ -219,14 +212,6 @@ static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
case WLAN_CIPHER_SUITE_CCMP_256:
case WLAN_CIPHER_SUITE_GCMP:
case WLAN_CIPHER_SUITE_GCMP_256:
/* We cannot do software crypto of data frames with
* encapsulation offload enabled. However for 802.11w to
* function properly we need cmac/gmac keys.
*/
if (sdata->hw_80211_encap)
return -EINVAL;
fallthrough;
case WLAN_CIPHER_SUITE_AES_CMAC:
case WLAN_CIPHER_SUITE_BIP_CMAC_256:
case WLAN_CIPHER_SUITE_BIP_GMAC_128:

6
net/mac80211/trace.h
View file

@ -2734,6 +2734,12 @@ TRACE_EVENT(drv_get_ftm_responder_stats,
)
);
DEFINE_EVENT(local_sdata_addr_evt, drv_update_vif_offload,
TP_PROTO(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata),
TP_ARGS(local, sdata)
);
#endif /* !__MAC80211_DRIVER_TRACE || TRACE_HEADER_MULTI_READ */
#undef TRACE_INCLUDE_PATH

36
net/mac80211/tx.c
View file

@ -4190,11 +4190,10 @@ static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata,
static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata,
struct net_device *dev, struct sta_info *sta,
struct sk_buff *skb)
struct ieee80211_key *key, struct sk_buff *skb)
{
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
struct ieee80211_local *local = sdata->local;
struct ieee80211_key *key;
struct tid_ampdu_tx *tid_tx;
u8 tid;
@ -4243,7 +4242,6 @@ static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata,
info->control.flags |= IEEE80211_TX_CTRL_HW_80211_ENCAP;
info->control.vif = &sdata->vif;
key = rcu_dereference(sta->ptk[sta->ptk_idx]);
if (key)
info->control.hw_key = &key->conf;
@ -4260,12 +4258,9 @@ netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb,
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ethhdr *ehdr = (struct ethhdr *)skb->data;
struct ieee80211_key *key;
struct sta_info *sta;
if (WARN_ON(!sdata->hw_80211_encap)) {
kfree_skb(skb);
return NETDEV_TX_OK;
}
bool offload = true;
if (unlikely(skb->len < ETH_HLEN)) {
kfree_skb(skb);
@ -4274,15 +4269,26 @@ netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb,
rcu_read_lock();
if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
kfree_skb(skb);
else if (unlikely(IS_ERR_OR_NULL(sta) || !sta->uploaded ||
!test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
sdata->control_port_protocol == ehdr->h_proto))
ieee80211_subif_start_xmit(skb, dev);
else
ieee80211_8023_xmit(sdata, dev, sta, skb);
goto out;
}
if (unlikely(IS_ERR_OR_NULL(sta) || !sta->uploaded ||
!test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
sdata->control_port_protocol == ehdr->h_proto))
offload = false;
else if ((key = rcu_dereference(sta->ptk[sta->ptk_idx])) &&
(!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) ||
key->conf.cipher == WLAN_CIPHER_SUITE_TKIP))
offload = false;
if (offload)
ieee80211_8023_xmit(sdata, dev, sta, key, skb);
else
ieee80211_subif_start_xmit(skb, dev);
out:
rcu_read_unlock();
return NETDEV_TX_OK;