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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
View file

@ -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;

10
drivers/net/wireless/rt2x00/rt2x00lib.h
View file

@ -295,8 +295,10 @@ void rt2x00crypto_create_tx_descriptor(struct queue_entry *entry,
struct txentry_desc *txdesc);
unsigned int rt2x00crypto_tx_overhead(struct rt2x00_dev *rt2x00dev,
struct sk_buff *skb);
void rt2x00crypto_tx_copy_iv(struct sk_buff *skb, unsigned int iv_len);
void rt2x00crypto_tx_remove_iv(struct sk_buff *skb, unsigned int iv_len);
void rt2x00crypto_tx_copy_iv(struct sk_buff *skb,
struct txentry_desc *txdesc);
void rt2x00crypto_tx_remove_iv(struct sk_buff *skb,
struct txentry_desc *txdesc);
void rt2x00crypto_tx_insert_iv(struct sk_buff *skb);
void rt2x00crypto_rx_insert_iv(struct sk_buff *skb, unsigned int align,
unsigned int header_length,
@ -319,12 +321,12 @@ static inline unsigned int rt2x00crypto_tx_overhead(struct rt2x00_dev *rt2x00dev
}
static inline void rt2x00crypto_tx_copy_iv(struct sk_buff *skb,
unsigned int iv_len)
struct txentry_desc *txdesc)
{
}
static inline void rt2x00crypto_tx_remove_iv(struct sk_buff *skb,
unsigned int iv_len)
struct txentry_desc *txdesc)
{
}

8
drivers/net/wireless/rt2x00/rt2x00queue.c
View file

@ -368,7 +368,6 @@ int rt2x00queue_write_tx_frame(struct data_queue *queue, struct sk_buff *skb)
struct queue_entry *entry = rt2x00queue_get_entry(queue, Q_INDEX);
struct txentry_desc txdesc;
struct skb_frame_desc *skbdesc;
unsigned int iv_len = 0;
u8 rate_idx, rate_flags;
if (unlikely(rt2x00queue_full(queue)))
@ -390,9 +389,6 @@ int rt2x00queue_write_tx_frame(struct data_queue *queue, struct sk_buff *skb)
entry->skb = skb;
rt2x00queue_create_tx_descriptor(entry, &txdesc);
if (IEEE80211_SKB_CB(skb)->control.hw_key != NULL)
iv_len = IEEE80211_SKB_CB(skb)->control.hw_key->iv_len;
/*
* All information is retrieved from the skb->cb array,
* now we should claim ownership of the driver part of that
@ -415,9 +411,9 @@ int rt2x00queue_write_tx_frame(struct data_queue *queue, struct sk_buff *skb)
if (test_bit(ENTRY_TXD_ENCRYPT, &txdesc.flags) &&
!test_bit(ENTRY_TXD_ENCRYPT_IV, &txdesc.flags)) {
if (test_bit(DRIVER_REQUIRE_COPY_IV, &queue->rt2x00dev->flags))
rt2x00crypto_tx_copy_iv(skb, iv_len);
rt2x00crypto_tx_copy_iv(skb, &txdesc);
else
rt2x00crypto_tx_remove_iv(skb, iv_len);
rt2x00crypto_tx_remove_iv(skb, &txdesc);
}
/*

2
drivers/net/wireless/rt2x00/rt2x00queue.h
View file

@ -280,6 +280,7 @@ enum txentry_desc_flags {
* @cipher: Cipher type used for encryption.
* @key_idx: Key index used for encryption.
* @iv_offset: Position where IV should be inserted by hardware.
* @iv_len: Length of IV data.
*/
struct txentry_desc {
unsigned long flags;
@ -302,6 +303,7 @@ struct txentry_desc {
enum cipher cipher;
u16 key_idx;
u16 iv_offset;
u16 iv_len;
};
/**