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mac80211: Skip tailroom reservation for full HW-crypto devices

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In xmit path, devices that do full hardware crypto (including
TKIP MMIC) need no tailroom. For such devices, tailroom
reservation can be skipped if all the keys are programmed into
the hardware (i.e software crypto is not used for any of the
keys) and none of the keys wants software to generate Michael
MIC.

Signed-off-by: Yogesh Ashok Powar <yogeshp@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Yogesh Ashok Powar
2011-04-27 18:40:29 +05:30
committed by John W. Linville
parent e2186b7c25
commit aac6af5534
3 changed files with 21 additions and 8 deletions
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19
net/mac80211/key.c
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@@ -101,6 +101,10 @@ 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->local->crypto_tx_tailroom_needed_cnt--;
return 0;
}
@@ -156,6 +160,9 @@ static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
key->conf.keyidx, sta ? sta->addr : bcast_addr, ret);
key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
if (!(key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC))
key->local->crypto_tx_tailroom_needed_cnt++;
}
void ieee80211_key_removed(struct ieee80211_key_conf *key_conf)
@@ -388,8 +395,10 @@ static void __ieee80211_key_destroy(struct ieee80211_key *key)
ieee80211_aes_key_free(key->u.ccmp.tfm);
if (key->conf.cipher == WLAN_CIPHER_SUITE_AES_CMAC)
ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);
if (key->local)
if (key->local) {
ieee80211_debugfs_key_remove(key);
key->local->crypto_tx_tailroom_needed_cnt--;
}
kfree(key);
}
@@ -451,6 +460,8 @@ int ieee80211_key_link(struct ieee80211_key *key,
ieee80211_debugfs_key_add(key);
key->local->crypto_tx_tailroom_needed_cnt++;
ret = ieee80211_key_enable_hw_accel(key);
mutex_unlock(&sdata->local->key_mtx);
@@ -492,8 +503,12 @@ void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata)
mutex_lock(&sdata->local->key_mtx);
list_for_each_entry(key, &sdata->key_list, list)
sdata->local->crypto_tx_tailroom_needed_cnt = 0;
list_for_each_entry(key, &sdata->key_list, list) {
sdata->local->crypto_tx_tailroom_needed_cnt++;
ieee80211_key_enable_hw_accel(key);
}
mutex_unlock(&sdata->local->key_mtx);
}