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authorFelix Fietkau <nbd@openwrt.org>2013-02-22 17:28:49 +0100
committerJohannes Berg <johannes.berg@intel.com>2013-03-06 16:35:45 +0100
commitb8a31c9a5afff257cc5dd637cda5fef03e12d67b (patch)
tree0b8555a584440f1c194b05680339d04b8c0a5107 /include/linux/ieee80211.h
parent9a886586c82aa02cb49f8c85e961595716884545 (diff)
ieee80211: mark 802.11 related structs as being 2-byte aligned
Regardless of what header features they use, or if they align the IP header or not, 802.11 packets from all drivers guarantee a 2-byte alignment (and there's a debug WARN_ON in case they don't). Annotate packet structs with __aligned(2) to allow the compiler to use 16-bit load/store operations on platforms with extremely inefficient unaligned access (e.g. MIPS). This reduces code size and improves performance on affected platforms and causes no binary code change on others. Signed-off-by: Felix Fietkau <nbd@openwrt.org> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'include/linux/ieee80211.h')
-rw-r--r--include/linux/ieee80211.h16
1 files changed, 8 insertions, 8 deletions
diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h
index a0c550fb65a6..6e352c31fee0 100644
--- a/include/linux/ieee80211.h
+++ b/include/linux/ieee80211.h
@@ -213,7 +213,7 @@ struct ieee80211_hdr {
u8 addr3[6];
__le16 seq_ctrl;
u8 addr4[6];
-} __packed;
+} __packed __aligned(2);
struct ieee80211_hdr_3addr {
__le16 frame_control;
@@ -222,7 +222,7 @@ struct ieee80211_hdr_3addr {
u8 addr2[6];
u8 addr3[6];
__le16 seq_ctrl;
-} __packed;
+} __packed __aligned(2);
struct ieee80211_qos_hdr {
__le16 frame_control;
@@ -232,7 +232,7 @@ struct ieee80211_qos_hdr {
u8 addr3[6];
__le16 seq_ctrl;
__le16 qos_ctrl;
-} __packed;
+} __packed __aligned(2);
/**
* ieee80211_has_tods - check if IEEE80211_FCTL_TODS is set
@@ -609,7 +609,7 @@ struct ieee80211s_hdr {
__le32 seqnum;
u8 eaddr1[6];
u8 eaddr2[6];
-} __packed;
+} __packed __aligned(2);
/* Mesh flags */
#define MESH_FLAGS_AE_A4 0x1
@@ -903,7 +903,7 @@ struct ieee80211_mgmt {
} u;
} __packed action;
} u;
-} __packed;
+} __packed __aligned(2);
/* Supported Rates value encodings in 802.11n-2009 7.3.2.2 */
#define BSS_MEMBERSHIP_SELECTOR_HT_PHY 127
@@ -934,20 +934,20 @@ struct ieee80211_rts {
__le16 duration;
u8 ra[6];
u8 ta[6];
-} __packed;
+} __packed __aligned(2);
struct ieee80211_cts {
__le16 frame_control;
__le16 duration;
u8 ra[6];
-} __packed;
+} __packed __aligned(2);
struct ieee80211_pspoll {
__le16 frame_control;
__le16 aid;
u8 bssid[6];
u8 ta[6];
-} __packed;
+} __packed __aligned(2);
/* TDLS */