mac80211: add rx decapsulation offload support
This allows drivers to pass 802.3 frames to mac80211, with some restrictions:
- the skb must be passed with a valid sta
- fast-rx needs to be active for the sta
- monitor mode needs to be disabled
mac80211 will tell the driver when it is safe to enable rx decap offload for
a particular station.
In order to implement support, a driver must:
- call ieee80211_hw_set(hw, SUPPORTS_RX_DECAP_OFFLOAD)
- implement ops->sta_set_decap_offload
- mark 802.3 frames with RX_FLAG_8023
If it doesn't want to enable offload for some vif types, it can mask out
IEEE80211_OFFLOAD_DECAP_ENABLED in vif->offload_flags from within the
.add_interface or .update_vif_offload driver ops
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Link: https://lore.kernel.org/r/20201218184718.93650-6-nbd@nbd.name
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index 3b9ec4e..1b44690 100644
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -765,7 +765,7 @@ static const struct net_device_ops ieee80211_dataif_8023_ops = {
.ndo_get_stats64 = ieee80211_get_stats64,
};
-static bool ieee80211_iftype_supports_encap_offload(enum nl80211_iftype iftype)
+static bool ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype)
{
switch (iftype) {
/* P2P GO and client are mapped to AP/STATION types */
@@ -785,7 +785,7 @@ static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdat
flags = sdata->vif.offload_flags;
if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) &&
- ieee80211_iftype_supports_encap_offload(sdata->vif.type)) {
+ ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED;
if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) &&
@@ -798,10 +798,21 @@ static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdat
flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
}
+ if (ieee80211_hw_check(&local->hw, SUPPORTS_RX_DECAP_OFFLOAD) &&
+ ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
+ flags |= IEEE80211_OFFLOAD_DECAP_ENABLED;
+
+ if (local->monitors)
+ flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
+ } else {
+ flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
+ }
+
if (sdata->vif.offload_flags == flags)
return false;
sdata->vif.offload_flags = flags;
+ ieee80211_check_fast_rx_iface(sdata);
return true;
}
@@ -819,7 +830,7 @@ static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata)
}
if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) ||
- !ieee80211_iftype_supports_encap_offload(bss->vif.type))
+ !ieee80211_iftype_supports_hdr_offload(bss->vif.type))
return;
enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED;