From 1ce9cdac482f0dfbbd22ba4b3e5c016a05543a42 Mon Sep 17 00:00:00 2001 From: Ivo van Doorn Date: Tue, 2 Dec 2008 18:19:48 +0100 Subject: 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 Signed-off-by: John W. Linville --- drivers/net/wireless/rt2x00/rt2x00crypto.c | 44 ++++++++++-------------------- 1 file changed, 14 insertions(+), 30 deletions(-) (limited to 'drivers/net/wireless/rt2x00/rt2x00crypto.c') diff --git a/drivers/net/wireless/rt2x00/rt2x00crypto.c b/drivers/net/wireless/rt2x00/rt2x00crypto.c index 5a858e5106c4..e0fc7c193040 100644 --- a/drivers/net/wireless/rt2x00/rt2x00crypto.c +++ b/drivers/net/wireless/rt2x00/rt2x00crypto.c @@ -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; -- cgit v1.2.3