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rt2x00: Optimize IV/EIV handling 

IV and EIV belong to eachother and don't require
2 seperate fields. Instead they can logically be
merged into a single array with size 2.

With this approach we can simplify the code in
rt2x00crypto.c by using a single memcpy() when
copying the iv/eiv data. Additionally we can
move some code out of if-statements because the
if-statement would always be true.

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 2008-12-02 18:19:48 +01:00 committed by John W. Linville
parent aac9207e45
commit 1ce9cdac48
4 changed files with 26 additions and 46 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

44
drivers/net/wireless/rt2x00/rt2x00crypto.c
View File

@ -78,10 +78,7 @@ void rt2x00crypto_tx_remove_iv(struct sk_buff *skb, unsigned int iv_len)
return;
/* Copy IV/EIV data */
if (iv_len >= 4)
memcpy(&skbdesc->iv, skb->data + header_length, 4);
if (iv_len >= 8)
memcpy(&skbdesc->eiv, skb->data + header_length + 4, 4);
memcpy(skbdesc->iv, skb->data + header_length, iv_len);
/* Move ieee80211 header */
memmove(skb->data + iv_len, skb->data, header_length);
@ -98,7 +95,7 @@ void rt2x00crypto_tx_insert_iv(struct sk_buff *skb)
struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb);
unsigned int header_length = ieee80211_get_hdrlen_from_skb(skb);
const unsigned int iv_len =
((!!(skbdesc->iv)) * 4) + ((!!(skbdesc->eiv)) * 4);
((!!(skbdesc->iv[0])) * 4) + ((!!(skbdesc->iv[1])) * 4);
if (!(skbdesc->flags & FRAME_DESC_IV_STRIPPED))
return;
@ -109,10 +106,7 @@ void rt2x00crypto_tx_insert_iv(struct sk_buff *skb)
memmove(skb->data, skb->data + iv_len, header_length);
/* Copy IV/EIV data */
if (iv_len >= 4)
memcpy(skb->data + header_length, &skbdesc->iv, 4);
if (iv_len >= 8)
memcpy(skb->data + header_length + 4, &skbdesc->eiv, 4);
memcpy(skb->data + header_length, skbdesc->iv, iv_len);
/* IV/EIV data has returned into the frame */
skbdesc->flags &= ~FRAME_DESC_IV_STRIPPED;
@ -172,17 +166,9 @@ void rt2x00crypto_rx_insert_iv(struct sk_buff *skb, unsigned int align,
header_length);
transfer += header_length;
/* Copy IV data */
if (iv_len >= 4) {
memcpy(skb->data + transfer, &rxdesc->iv, 4);
transfer += 4;
}
/* Copy EIV data */
if (iv_len >= 8) {
memcpy(skb->data + transfer, &rxdesc->eiv, 4);
transfer += 4;
}
/* Copy IV/EIV data */
memcpy(skb->data + transfer, rxdesc->iv, iv_len);
transfer += iv_len;
/* Move payload */
if (align) {
@ -198,16 +184,14 @@ void rt2x00crypto_rx_insert_iv(struct sk_buff *skb, unsigned int align,
*/
transfer += payload_len;
/* Copy ICV data */
if (icv_len >= 4) {
memcpy(skb->data + transfer, &rxdesc->icv, 4);
/*
* AES appends 8 bytes, we can't fill the upper
* 4 bytes, but mac80211 doesn't care about what
* we provide here anyway and strips it immediately.
*/
transfer += icv_len;
}
/*
* Copy ICV data
* AES appends 8 bytes, we can't fill the upper
* 4 bytes, but mac80211 doesn't care about what
* we provide here anyway and strips it immediately.
*/
memcpy(skb->data + transfer, &rxdesc->icv, 4);
transfer += icv_len;
/* IV/EIV/ICV has been inserted into frame */
rxdesc->size = transfer;

12
drivers/net/wireless/rt2x00/rt2x00queue.h
View File

@ -109,8 +109,7 @@ enum skb_frame_desc_flags {
* @desc: Pointer to descriptor part of the frame.
* Note that this pointer could point to something outside
* of the scope of the skb->data pointer.
* @iv: IV data used during encryption/decryption.
* @eiv: EIV data used during encryption/decryption.
* @iv: IV/EIV data used during encryption/decryption.
* @skb_dma: (PCI-only) the DMA address associated with the sk buffer.
* @entry: The entry to which this sk buffer belongs.
*/
@ -123,8 +122,7 @@ struct skb_frame_desc {
void *desc;
__le32 iv;
__le32 eiv;
__le32 iv[2];
dma_addr_t skb_dma;
@ -168,8 +166,7 @@ enum rxdone_entry_desc_flags {
* @dev_flags: Ralink receive flags (See &enum rxdone_entry_desc_flags).
* @cipher: Cipher type used during decryption.
* @cipher_status: Decryption status.
* @iv: IV data used during decryption.
* @eiv: EIV data used during decryption.
* @iv: IV/EIV data used during decryption.
* @icv: ICV data used during decryption.
*/
struct rxdone_entry_desc {
@ -182,8 +179,7 @@ struct rxdone_entry_desc {
u8 cipher;
u8 cipher_status;
__le32 iv;
__le32 eiv;
__le32 iv[2];
__le32 icv;
};

8
drivers/net/wireless/rt2x00/rt61pci.c
View File

@ -1778,8 +1778,8 @@ static void rt61pci_write_tx_desc(struct rt2x00_dev *rt2x00dev,
rt2x00_desc_write(txd, 2, word);
if (test_bit(ENTRY_TXD_ENCRYPT, &txdesc->flags)) {
_rt2x00_desc_write(txd, 3, skbdesc->iv);
_rt2x00_desc_write(txd, 4, skbdesc->eiv);
_rt2x00_desc_write(txd, 3, skbdesc->iv[0]);
_rt2x00_desc_write(txd, 4, skbdesc->iv[1]);
}
rt2x00_desc_read(txd, 5, &word);
@ -1949,8 +1949,8 @@ static void rt61pci_fill_rxdone(struct queue_entry *entry,
}
if (rxdesc->cipher != CIPHER_NONE) {
_rt2x00_desc_read(entry_priv->desc, 2, &rxdesc->iv);
_rt2x00_desc_read(entry_priv->desc, 3, &rxdesc->eiv);
_rt2x00_desc_read(entry_priv->desc, 2, &rxdesc->iv[0]);
_rt2x00_desc_read(entry_priv->desc, 3, &rxdesc->iv[1]);
_rt2x00_desc_read(entry_priv->desc, 4, &rxdesc->icv);
/*

8
drivers/net/wireless/rt2x00/rt73usb.c
View File

@ -1428,8 +1428,8 @@ static void rt73usb_write_tx_desc(struct rt2x00_dev *rt2x00dev,
rt2x00_desc_write(txd, 2, word);
if (test_bit(ENTRY_TXD_ENCRYPT, &txdesc->flags)) {
_rt2x00_desc_write(txd, 3, skbdesc->iv);
_rt2x00_desc_write(txd, 4, skbdesc->eiv);
_rt2x00_desc_write(txd, 3, skbdesc->iv[0]);
_rt2x00_desc_write(txd, 4, skbdesc->iv[1]);
}
rt2x00_desc_read(txd, 5, &word);
@ -1618,8 +1618,8 @@ static void rt73usb_fill_rxdone(struct queue_entry *entry,
}
if (rxdesc->cipher != CIPHER_NONE) {
_rt2x00_desc_read(rxd, 2, &rxdesc->iv);
_rt2x00_desc_read(rxd, 3, &rxdesc->eiv);
_rt2x00_desc_read(rxd, 2, &rxdesc->iv[0]);
_rt2x00_desc_read(rxd, 3, &rxdesc->iv[1]);
_rt2x00_desc_read(rxd, 4, &rxdesc->icv);
/*