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From: Harvey Harrison <harvey.harrison@gmail.com>
To: Johannes Berg <johannes@sipsolutions.net>
Cc: John Linville <linville@tuxdriver.com>,
	linux-wireless <linux-wireless@vger.kernel.org>
Subject: Re: [PATCH] mac80211: remove unnecessary byteshifts in frame control testing
Date: Mon, 21 Apr 2008 10:41:10 -0700	[thread overview]
Message-ID: <1208799670.7941.22.camel@brick> (raw)
In-Reply-To: <1208766013.26186.30.camel@johannes.berg>

Byteswap the constants rather than the frame_control member.

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
---
Johannes, incorporated your suggestionsre non-underscored version
where possible.

 include/linux/ieee80211.h |   32 +++++++++++++++++---------------
 1 files changed, 17 insertions(+), 15 deletions(-)

diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h
index f27d11a..b73749a 100644
--- a/include/linux/ieee80211.h
+++ b/include/linux/ieee80211.h
@@ -546,16 +546,17 @@ enum ieee80211_back_parties {
  */
 static inline u8 *ieee80211_get_SA(struct ieee80211_hdr *hdr)
 {
-	u8 *raw = (u8 *) hdr;
-	u8 tofrom = (*(raw+1)) & 3; /* get the TODS and FROMDS bits */
-
-	switch (tofrom) {
-		case 2:
-			return hdr->addr3;
-		case 3:
-			return hdr->addr4;
+	__le16 fc = hdr->frame_control;
+	fc &= cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS);
+
+	switch (fc) {
+	case __constant_cpu_to_le16(IEEE80211_FCTL_FROMDS):
+		return hdr->addr3;
+	case __constant_cpu_to_le16(IEEE80211_FCTL_TODS|IEEE80211_FCTL_FROMDS):
+		return hdr->addr4;
+	default:
+		return hdr->addr2;
 	}
-	return hdr->addr2;
 }
 
 /**
@@ -571,12 +572,13 @@ static inline u8 *ieee80211_get_SA(struct ieee80211_hdr *hdr)
  */
 static inline u8 *ieee80211_get_DA(struct ieee80211_hdr *hdr)
 {
-	u8 *raw = (u8 *) hdr;
-	u8 to_ds = (*(raw+1)) & 1; /* get the TODS bit */
+	__le16 fc = hdr->frame_control;
+	fc &= cpu_to_le16(IEEE80211_FCTL_TODS);
 
-	if (to_ds)
+	if (fc)
 		return hdr->addr3;
-	return hdr->addr1;
+	else
+		return hdr->addr1;
 }
 
 /**
@@ -589,8 +591,8 @@ static inline u8 *ieee80211_get_DA(struct ieee80211_hdr *hdr)
  */
 static inline int ieee80211_get_morefrag(struct ieee80211_hdr *hdr)
 {
-	return (le16_to_cpu(hdr->frame_control) &
-		IEEE80211_FCTL_MOREFRAGS) != 0;
+	__le16 fc = hdr->frame_control;
+	return !!(fc & cpu_to_le16(IEEE80211_FCTL_MOREFRAGS));
 }
 
 #endif /* IEEE80211_H */
-- 
1.5.5.144.g3e42




      reply	other threads:[~2008-04-21 17:40 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-04-21  2:33 [PATCH] mac80211: remove unnecessary byteshifts in frame control testing Harvey Harrison
2008-04-21  8:20 ` Johannes Berg
2008-04-21 17:41   ` Harvey Harrison [this message]

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