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authorIdo Yariv <ido@wizery.com>2014-07-29 16:38:53 +0400
committerJohannes Berg <johannes.berg@intel.com>2014-08-26 13:15:59 +0400
commitca34e3b5c808385b175650605faa29e71e91991b (patch)
tree306b688cae1820d65902c31c82b95f4c23e9293b
parent170fd0b1f6108b48df4369afa0ee29a83e922748 (diff)
downloadlinux-ca34e3b5c808385b175650605faa29e71e91991b.tar.xz
mac80211: Fix accounting of the tailroom-needed counter
When hw acceleration is enabled, the GENERATE_IV or PUT_IV_SPACE flags will only require headroom space. Consequently, the tailroom-needed counter can safely be decremented. Signed-off-by: Ido Yariv <idox.yariv@intel.com> Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
-rw-r--r--include/net/mac80211.h7
-rw-r--r--net/mac80211/key.c12
2 files changed, 8 insertions, 11 deletions
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 1cd84444665c..1fbed0a6d556 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -1226,7 +1226,8 @@ struct ieee80211_vif *wdev_to_ieee80211_vif(struct wireless_dev *wdev);
*
* @IEEE80211_KEY_FLAG_GENERATE_IV: This flag should be set by the
* driver to indicate that it requires IV generation for this
- * particular key.
+ * particular key. Setting this flag does not necessarily mean that SKBs
+ * will have sufficient tailroom for ICV or MIC.
* @IEEE80211_KEY_FLAG_GENERATE_MMIC: This flag should be set by
* the driver for a TKIP key if it requires Michael MIC
* generation in software.
@@ -1238,7 +1239,9 @@ struct ieee80211_vif *wdev_to_ieee80211_vif(struct wireless_dev *wdev);
* @IEEE80211_KEY_FLAG_PUT_IV_SPACE: This flag should be set by the driver
* if space should be prepared for the IV, but the IV
* itself should not be generated. Do not set together with
- * @IEEE80211_KEY_FLAG_GENERATE_IV on the same key.
+ * @IEEE80211_KEY_FLAG_GENERATE_IV on the same key. Setting this flag does
+ * not necessarily mean that SKBs will have sufficient tailroom for ICV or
+ * MIC.
* @IEEE80211_KEY_FLAG_RX_MGMT: This key will be used to decrypt received
* management frames. The flag can help drivers that have a hardware
* crypto implementation that doesn't deal with management frames
diff --git a/net/mac80211/key.c b/net/mac80211/key.c
index d808cff80153..6429d0e1d4a1 100644
--- a/net/mac80211/key.c
+++ b/net/mac80211/key.c
@@ -130,9 +130,7 @@ static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
if (!ret) {
key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE;
- if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) ||
- (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) ||
- (key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)))
+ if (!(key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC))
sdata->crypto_tx_tailroom_needed_cnt--;
WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
@@ -180,9 +178,7 @@ static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
sta = key->sta;
sdata = key->sdata;
- if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) ||
- (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) ||
- (key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)))
+ if (!(key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC))
increment_tailroom_need_count(sdata);
ret = drv_set_key(key->local, DISABLE_KEY, sdata,
@@ -878,9 +874,7 @@ void ieee80211_remove_key(struct ieee80211_key_conf *keyconf)
if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
- if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) ||
- (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) ||
- (key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)))
+ if (!(key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC))
increment_tailroom_need_count(key->sdata);
}