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rt2x00: Move iv_len into tx descriptor data

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By placing the iv_len into the tx descriptor data and
by passing this data to the crypto IV handlers we can
save multiple calls to ieee80211_get_hdrlen_from_skb()
and some if-statements when copying/removing the IV data
from the outgoing frame.

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Ivo van Doorn
2009-04-26 16:08:30 +02:00
committed by John W. Linville
parent bbb33881ae
commit 9eb4e21e28
4 changed files with 19 additions and 20 deletions
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19
drivers/net/wireless/rt2x00/rt2x00crypto.c
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@@ -66,6 +66,7 @@ void rt2x00crypto_create_tx_descriptor(struct queue_entry *entry,
txdesc->key_idx = hw_key->hw_key_idx;
txdesc->iv_offset = ieee80211_get_hdrlen_from_skb(entry->skb);
txdesc->iv_len = hw_key->iv_len;
if (!(hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV))
__set_bit(ENTRY_TXD_ENCRYPT_IV, &txdesc->flags);
@@ -103,34 +104,32 @@ unsigned int rt2x00crypto_tx_overhead(struct rt2x00_dev *rt2x00dev,
return overhead;
}
void rt2x00crypto_tx_copy_iv(struct sk_buff *skb, unsigned int iv_len)
void rt2x00crypto_tx_copy_iv(struct sk_buff *skb, struct txentry_desc *txdesc)
{
struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb);
unsigned int header_length = ieee80211_get_hdrlen_from_skb(skb);
if (unlikely(!iv_len))
if (unlikely(!txdesc->iv_len))
return;
/* Copy IV/EIV data */
memcpy(skbdesc->iv, skb->data + header_length, iv_len);
memcpy(skbdesc->iv, skb->data + txdesc->iv_offset, txdesc->iv_len);
}
void rt2x00crypto_tx_remove_iv(struct sk_buff *skb, unsigned int iv_len)
void rt2x00crypto_tx_remove_iv(struct sk_buff *skb, struct txentry_desc *txdesc)
{
struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb);
unsigned int header_length = ieee80211_get_hdrlen_from_skb(skb);
if (unlikely(!iv_len))
if (unlikely(!txdesc->iv_len))
return;
/* Copy IV/EIV data */
memcpy(skbdesc->iv, skb->data + header_length, iv_len);
memcpy(skbdesc->iv, skb->data + txdesc->iv_offset, txdesc->iv_len);
/* Move ieee80211 header */
memmove(skb->data + iv_len, skb->data, header_length);
memmove(skb->data + txdesc->iv_len, skb->data, txdesc->iv_offset);
/* Pull buffer to correct size */
skb_pull(skb, iv_len);
skb_pull(skb, txdesc->iv_len);
/* IV/EIV data has officially be stripped */
skbdesc->flags |= FRAME_DESC_IV_STRIPPED;