mac80211: allow low-level drivers to set netdev feature bits
Low level drivers can now set certain netdev feature bits in
netdev_features member of the ieee80211_hw struct. These will be
propagated to every netdev created from this HW.
The white-listed features currently include only ones related to HW
checksumming.
Signed-off-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 1937c7d..0286c04 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -1297,6 +1297,10 @@
* reports, by default it is set to _MCS, _GI and _BW but doesn't
* include _FMT. Use %IEEE80211_RADIOTAP_MCS_HAVE_* values, only
* adding _BW is supported today.
+ *
+ * @netdev_features: netdev features to be set in each netdev created
+ * from this HW. Note only HW checksum features are currently
+ * compatible with mac80211. Other feature bits will be rejected.
*/
struct ieee80211_hw {
struct ieee80211_conf conf;
@@ -1319,6 +1323,7 @@
u8 max_tx_aggregation_subframes;
u8 offchannel_tx_hw_queue;
u8 radiotap_mcs_details;
+ netdev_features_t netdev_features;
};
/**
diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index d4c19a7..f970e0b 100644
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -1352,6 +1352,8 @@
sdata->u.mgd.use_4addr = params->use_4addr;
}
+ ndev->features |= local->hw.netdev_features;
+
ret = register_netdevice(ndev);
if (ret)
goto fail;
diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index f5548e9..779ac61 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -682,6 +682,7 @@
enum ieee80211_band band;
int channels, max_bitrates;
bool supp_ht;
+ netdev_features_t feature_whitelist;
static const u32 cipher_suites[] = {
/* keep WEP first, it may be removed below */
WLAN_CIPHER_SUITE_WEP40,
@@ -708,6 +709,12 @@
if ((hw->flags & IEEE80211_HW_SCAN_WHILE_IDLE) && !local->ops->hw_scan)
return -EINVAL;
+ /* Only HW csum features are currently compatible with mac80211 */
+ feature_whitelist = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
+ NETIF_F_HW_CSUM;
+ if (WARN_ON(hw->netdev_features & ~feature_whitelist))
+ return -EINVAL;
+
if (hw->max_report_rates == 0)
hw->max_report_rates = hw->max_rates;