diff options
| author | Johannes Berg <johannes.berg@intel.com> | 2014-11-13 13:06:43 +0300 |
|---|---|---|
| committer | Emmanuel Grumbach <emmanuel.grumbach@intel.com> | 2014-11-24 09:30:18 +0300 |
| commit | 3771a89022bc4aa56bca5e7d3f34eee46ebedfdb (patch) | |
| tree | 00722995adf28e5dc6df6ef76b833074fa528bf2 /drivers | |
| parent | eb96ccb138fccdedd76c773e476e4a6ce4b3c05c (diff) | |
| download | linux-3771a89022bc4aa56bca5e7d3f34eee46ebedfdb.tar.xz | |
iwlwifi: mvm: pull SNAP header into skb->head
When we pre-populate the skb->head for the stack, we only pull
in the 802.11 header including crypto (assuming the packet isn't
short enough to be in there completely.) This is fine, but in
ieee80211_data_to_8023() we later unconditionally pull 8 more
bytes for the SNAP header and ethertype field (except for mesh
or 4-addr, where it's even more, but we don't care as much about
them).
Avoid the additional later pull by pulling in those 8 bytes here.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Reviewed-by: IdoX Yariv <ido@wizery.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/wireless/iwlwifi/mvm/rx.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/drivers/net/wireless/iwlwifi/mvm/rx.c b/drivers/net/wireless/iwlwifi/mvm/rx.c index 69fa765e29b5..94b6e7297a1e 100644 --- a/drivers/net/wireless/iwlwifi/mvm/rx.c +++ b/drivers/net/wireless/iwlwifi/mvm/rx.c @@ -104,10 +104,19 @@ static void iwl_mvm_pass_packet_to_mac80211(struct iwl_mvm *mvm, unsigned int hdrlen, fraglen; /* If frame is small enough to fit in skb->head, pull it completely. - * If not, only pull ieee80211_hdr (including crypto if present) so - * that splice() or TCP coalesce are more efficient. + * If not, only pull ieee80211_hdr (including crypto if present, and + * an additional 8 bytes for SNAP/ethertype, see below) so that + * splice() or TCP coalesce are more efficient. + * + * Since, in addition, ieee80211_data_to_8023() always pull in at + * least 8 bytes (possibly more for mesh) we can do the same here + * to save the cost of doing it later. That still doesn't pull in + * the actual IP header since the typical case has a SNAP header. + * If the latter changes (there are efforts in the standards group + * to do so) we should revisit this and ieee80211_data_to_8023(). */ - hdrlen = (len <= skb_tailroom(skb)) ? len : sizeof(*hdr) + crypt_len; + hdrlen = (len <= skb_tailroom(skb)) ? len : + sizeof(*hdr) + crypt_len + 8; memcpy(skb_put(skb, hdrlen), hdr, hdrlen); fraglen = len - hdrlen; |