From 7d360f6061db01830adfdb1eaa3977b19db0c30b Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Mon, 10 Oct 2022 11:43:38 +0200 Subject: wifi: mac80211: add support for restricting netdev features per vif This can be used to selectively disable feature flags for checksum offload, scatter/gather or GSO by changing vif->netdev_features. Removing features from vif->netdev_features does not affect the netdev features themselves, but instead fixes up skbs in the tx path so that the offloads are not needed in the driver. Aside from making it easier to deal with vif type based hardware limitations, this also makes it possible to optimize performance on hardware without native GSO support by declaring GSO support in hw->netdev_features and removing it from vif->netdev_features. This allows mac80211 to handle GSO segmentation after the sta lookup, but before itxq enqueue, thus reducing the number of unnecessary sta lookups, as well as some other per-packet processing. Signed-off-by: Felix Fietkau Link: https://lore.kernel.org/r/20221010094338.78070-1-nbd@nbd.name Signed-off-by: Johannes Berg --- net/mac80211/iface.c | 1 + 1 file changed, 1 insertion(+) (limited to 'net/mac80211/iface.c') diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c index 7b2843df3813..d49a5906a943 100644 --- a/net/mac80211/iface.c +++ b/net/mac80211/iface.c @@ -2178,6 +2178,7 @@ int ieee80211_if_add(struct ieee80211_local *local, const char *name, ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE; ndev->hw_features |= ndev->features & MAC80211_SUPPORTED_FEATURES_TX; + sdata->vif.netdev_features = local->hw.netdev_features; netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops); -- cgit v1.2.3