On Saturday 22 January 2011 00:10:23 Vasanthakumar Thiagarajan wrote:
> On Fri, Jan 21, 2011 at 03:46:08PM +0530, Bruno Randolf wrote:
> > I need this to enable HW encryption for WEP.
> > Otherwise we fall back to software decryption - i only checked the
> > decryption case.
>
> Encryption/Decryption is done in hw by default. In which case are you
> seeing it done in sw?.
Sorry i was not very verbose in my description yesterday.
I'm seeing the problem when i have an AP configured with WEP.
The reason is that the index returned by the "reserve_keycache_entry" function
(sorry i dont have the code here right now) is >= 4 (hw_key_index) while the
key index in the packet header is 0-3. This is ok for transmit but received
packets are not decrypted and therefore mac80211 has to decrypt it in SW -
this can be easily seen by adding some debug prints in mac80211/wep.c. I have
noticed it by watching the system CPU load under high traffic.
bruno
> > Any comments?
> >
> > bruno
> > ---
> >
> > drivers/net/wireless/ath/key.c | 14 +++++++++++---
> > 1 files changed, 11 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/net/wireless/ath/key.c
> > b/drivers/net/wireless/ath/key.c index 5d465e5..5748dae 100644
> > --- a/drivers/net/wireless/ath/key.c
> > +++ b/drivers/net/wireless/ath/key.c
> > @@ -465,6 +465,16 @@ int ath_key_config(struct ath_common *common,
> >
> > hk.kv_len = key->keylen;
> > memcpy(hk.kv_val, key->key, key->keylen);
> >
> > + /* set WEP keys directly to index */
> > + if ((key->cipher == WLAN_CIPHER_SUITE_WEP40 ||
> > + key->cipher == WLAN_CIPHER_SUITE_WEP104) && key->keyidx < 4) {
> > + ret = ath_hw_set_keycache_entry(common, key->keyidx, &hk,
NULL);
> > + if (!ret)
> > + return -EIO;
> > + set_bit(key->keyidx, common->keymap);
> > + return key->keyidx;
> > + }
> > +
> >
> > if (!(key->flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
> >
> > switch (vif->type) {
> >
> > case NL80211_IFTYPE_AP:
> > @@ -541,10 +551,8 @@ EXPORT_SYMBOL(ath_key_config);
> >
> > void ath_key_delete(struct ath_common *common, struct ieee80211_key_conf
> > *key) {
> >
> > ath_hw_keyreset(common, key->hw_key_idx);
> >
> > - if (key->hw_key_idx < IEEE80211_WEP_NKID)
> > - return;
> > -
> >
> > clear_bit(key->hw_key_idx, common->keymap);
> >
> > +
> >
> > if (key->cipher != WLAN_CIPHER_SUITE_TKIP)
> >
> > return;
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