commit ca34e3b5c808385b175650605faa29e71e91991b
author Ido Yariv <ido@wizery.com> Tue Jul 29 15:38:53 2014 +0300
committer Johannes Berg <johannes.berg@intel.com> Tue Aug 26 11:15:59 2014 +0200
tree 306b688cae1820d65902c31c82b95f4c23e9293b
parent 170fd0b1f6108b48df4369afa0ee29a83e922748

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>

include/net/mac80211.h

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 1cd8444..1fbed0a 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -1226,7 +1226,8 @@
  *
  * @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 @@
  * @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

net/mac80211/key.c

diff --git a/net/mac80211/key.c b/net/mac80211/key.c
index d808cff..6429d0e 100644
--- a/net/mac80211/key.c
+++ b/net/mac80211/key.c
@@ -130,9 +130,7 @@
 	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 @@
 	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 @@
 	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);
 	}