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mac80211: allow drivers to support S/G 

If drivers want to support S/G (really just gather DMA on TX) then
we can now easily support this on the fast-xmit path since it just
needs to write to the ethernet header (and already has a check for
that being possible.)

However, disallow this on the regular TX path (which has to handle
fragmentation, software crypto, etc.) by calling skb_linearize().

Also allow the related HIGHDMA since that's not interesting to the
code in mac80211 at all anyway.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2015-04-13 16:58:25 +02:00
parent 2d981fddb0
commit 680a0daba7
3 changed files with 9 additions and 3 deletions
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4
include/net/mac80211.h
View File

@ -1942,8 +1942,8 @@ enum ieee80211_hw_flags {
* Use the %IEEE80211_RADIOTAP_VHT_KNOWN_* values.
*
* @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.
* from this HW. Note that not all features are usable with mac80211,
* other features will be rejected during HW registration.
*
* @uapsd_queues: This bitmap is included in (re)association frame to indicate
* for each access category if it is uAPSD trigger-enabled and delivery-

2
net/mac80211/main.c
View File

@ -840,7 +840,7 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
/* Only HW csum features are currently compatible with mac80211 */
feature_whitelist = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
NETIF_F_HW_CSUM;
NETIF_F_HW_CSUM | NETIF_F_SG | NETIF_F_HIGHDMA;
if (WARN_ON(hw->netdev_features & ~feature_whitelist))
return -EINVAL;

6
net/mac80211/tx.c
View File

@ -2864,6 +2864,12 @@ void __ieee80211_subif_start_xmit(struct sk_buff *skb,
goto out;
}
/* we cannot process non-linear frames on this path */
if (skb_linearize(skb)) {
kfree_skb(skb);
goto out;
}
/* the frame could be fragmented, software-encrypted, and other things
* so we cannot really handle checksum offload with it - fix it up in
* software before we handle anything else.