Commit d787a3e3 authored by Felix Fietkau's avatar Felix Fietkau Committed by Johannes Berg
Browse files

mac80211: add support for .ndo_fill_forward_path 



This allows drivers to provide a destination device + info for flow offload
Only supported in combination with 802.3 encap offload

Signed-off-by: default avatarFelix Fietkau <nbd@nbd.name>
Tested-by: default avatarLorenzo Bianconi <lorenzo@kernel.org>
Link: https://lore.kernel.org/r/20211112112223.1209-1-nbd@nbd.name


Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 71abf71e

include/net/mac80211.h

+7 −0
Original line number Diff line number Diff line
@@ -3952,6 +3952,8 @@ struct ieee80211_prep_tx_info { 
 *	radar channel.

 *	The caller is expected to set chandef pointer to NULL in order to

 *	disable offchannel CAC/radar detection.

 * @net_fill_forward_path: Called from .ndo_fill_forward_path in order to

 *	resolve a path for hardware flow offloading

 */

struct ieee80211_ops {

	void (*tx)(struct ieee80211_hw *hw,
@@ -4282,6 +4284,11 @@ struct ieee80211_ops { 
				     struct ieee80211_sta *sta, u8 flowid);

	int (*set_radar_offchan)(struct ieee80211_hw *hw,

				 struct cfg80211_chan_def *chandef);

	int (*net_fill_forward_path)(struct ieee80211_hw *hw,

				     struct ieee80211_vif *vif,

				     struct ieee80211_sta *sta,

				     struct net_device_path_ctx *ctx,

				     struct net_device_path *path);

};



/**

net/mac80211/driver-ops.h

+22 −0
Original line number Diff line number Diff line
@@ -1483,4 +1483,26 @@ static inline void drv_twt_teardown_request(struct ieee80211_local *local, 
	trace_drv_return_void(local);

}



static inline int drv_net_fill_forward_path(struct ieee80211_local *local,

					    struct ieee80211_sub_if_data *sdata,

					    struct ieee80211_sta *sta,

					    struct net_device_path_ctx *ctx,

					    struct net_device_path *path)

{

	int ret = -EOPNOTSUPP;



	sdata = get_bss_sdata(sdata);

	if (!check_sdata_in_driver(sdata))

		return -EIO;



	trace_drv_net_fill_forward_path(local, sdata, sta);

	if (local->ops->net_fill_forward_path)

		ret = local->ops->net_fill_forward_path(&local->hw,

							&sdata->vif, sta,

							ctx, path);

	trace_drv_return_int(local, ret);



	return ret;

}



#endif /* __MAC80211_DRIVER_OPS */

net/mac80211/ieee80211_i.h

+1 −1
Original line number Diff line number Diff line
@@ -1463,7 +1463,7 @@ struct ieee80211_local { 
};



static inline struct ieee80211_sub_if_data *

IEEE80211_DEV_TO_SUB_IF(struct net_device *dev)

IEEE80211_DEV_TO_SUB_IF(const struct net_device *dev)

{

	return netdev_priv(dev);

}

net/mac80211/iface.c

+59 −0
Original line number Diff line number Diff line
@@ -789,6 +789,64 @@ static const struct net_device_ops ieee80211_monitorif_ops = { 
	.ndo_get_stats64	= ieee80211_get_stats64,

};



static int ieee80211_netdev_fill_forward_path(struct net_device_path_ctx *ctx,

					      struct net_device_path *path)

{

	struct ieee80211_sub_if_data *sdata;

	struct ieee80211_local *local;

	struct sta_info *sta;

	int ret = -ENOENT;



	sdata = IEEE80211_DEV_TO_SUB_IF(ctx->dev);

	local = sdata->local;



	if (!local->ops->net_fill_forward_path)

		return -EOPNOTSUPP;



	rcu_read_lock();

	switch (sdata->vif.type) {

	case NL80211_IFTYPE_AP_VLAN:

		sta = rcu_dereference(sdata->u.vlan.sta);

		if (sta)

			break;

		if (sdata->wdev.use_4addr)

			goto out;

		if (is_multicast_ether_addr(ctx->daddr))

			goto out;

		sta = sta_info_get_bss(sdata, ctx->daddr);

		break;

	case NL80211_IFTYPE_AP:

		if (is_multicast_ether_addr(ctx->daddr))

			goto out;

		sta = sta_info_get(sdata, ctx->daddr);

		break;

	case NL80211_IFTYPE_STATION:

		if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {

			sta = sta_info_get(sdata, ctx->daddr);

			if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {

				if (!test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))

					goto out;



				break;

			}

		}



		sta = sta_info_get(sdata, sdata->u.mgd.bssid);

		break;

	default:

		goto out;

	}



	if (!sta)

		goto out;



	ret = drv_net_fill_forward_path(local, sdata, &sta->sta, ctx, path);

out:

	rcu_read_unlock();



	return ret;

}



static const struct net_device_ops ieee80211_dataif_8023_ops = {

	.ndo_open		= ieee80211_open,

	.ndo_stop		= ieee80211_stop,
@@ -798,6 +856,7 @@ static const struct net_device_ops ieee80211_dataif_8023_ops = { 
	.ndo_set_mac_address	= ieee80211_change_mac,

	.ndo_select_queue	= ieee80211_netdev_select_queue,

	.ndo_get_stats64	= ieee80211_get_stats64,

	.ndo_fill_forward_path	= ieee80211_netdev_fill_forward_path,

};



static bool ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype)

net/mac80211/trace.h

+7 −0
Original line number Diff line number Diff line
@@ -2892,6 +2892,13 @@ TRACE_EVENT(drv_twt_teardown_request, 
	)

);



DEFINE_EVENT(sta_event, drv_net_fill_forward_path,

	TP_PROTO(struct ieee80211_local *local,

		 struct ieee80211_sub_if_data *sdata,

		 struct ieee80211_sta *sta),

	TP_ARGS(local, sdata, sta)

);



#endif /* !__MAC80211_DRIVER_TRACE || TRACE_HEADER_MULTI_READ */



#undef TRACE_INCLUDE_PATH