nl80211: add packet offset information for wowlan pattern

If user knows the location of a wowlan pattern to be matched in
Rx packet, he can provide an offset with the pattern. This will
help drivers to ignore initial bytes and match the pattern
efficiently.

Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
[refactor pattern sending]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

2 files changed, 13 insertions, 3 deletions

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 77686ca28948..d3a73818e44c 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1576,6 +1576,7 @@ struct cfg80211_pmksa {
  *      one bit per byte, in same format as nl80211
  * @pattern: bytes to match where bitmask is 1
  * @pattern_len: length of pattern (in bytes)
+ * @pkt_offset: packet offset (in bytes)
  *
  * Internal note: @mask and @pattern are allocated in one chunk of
  * memory, free @mask only!
@@ -1583,6 +1584,7 @@ struct cfg80211_pmksa {
 struct cfg80211_wowlan_trig_pkt_pattern {
         u8 *mask, *pattern;
         int pattern_len;
+        int pkt_offset;
 };
 
 /**
@@ -2290,12 +2292,14 @@ enum wiphy_wowlan_support_flags {
  *      (see nl80211.h for the pattern definition)
  * @pattern_max_len: maximum length of each pattern
  * @pattern_min_len: minimum length of each pattern
+ * @max_pkt_offset: maximum Rx packet offset
  */
 struct wiphy_wowlan_support {
         u32 flags;
         int n_patterns;
         int pattern_max_len;
         int pattern_min_len;
+        int max_pkt_offset;
 };
 
 /**
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index b23321154e8b..eb7b32247ec5 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -2910,6 +2910,8 @@ enum nl80211_tx_power_setting {
  *      Note that the pattern matching is done as though frames were not
  *      802.11 frames but 802.3 frames, i.e. the frame is fully unpacked
  *      first (including SNAP header unpacking) and then matched.
+ * @NL80211_WOWLAN_PKTPAT_OFFSET: packet offset, pattern is matched after
+ *      these fixed number of bytes of received packet
  * @NUM_NL80211_WOWLAN_PKTPAT: number of attributes
  * @MAX_NL80211_WOWLAN_PKTPAT: max attribute number
  */
@@ -2917,6 +2919,7 @@ enum nl80211_wowlan_packet_pattern_attr {
         __NL80211_WOWLAN_PKTPAT_INVALID,
         NL80211_WOWLAN_PKTPAT_MASK,
         NL80211_WOWLAN_PKTPAT_PATTERN,
+        NL80211_WOWLAN_PKTPAT_OFFSET,
 
         NUM_NL80211_WOWLAN_PKTPAT,
         MAX_NL80211_WOWLAN_PKTPAT = NUM_NL80211_WOWLAN_PKTPAT - 1,
@@ -2927,6 +2930,7 @@ enum nl80211_wowlan_packet_pattern_attr {
  * @max_patterns: maximum number of patterns supported
  * @min_pattern_len: minimum length of each pattern
  * @max_pattern_len: maximum length of each pattern
+ * @max_pkt_offset: maximum Rx packet offset
  *
  * This struct is carried in %NL80211_WOWLAN_TRIG_PKT_PATTERN when
  * that is part of %NL80211_ATTR_WOWLAN_TRIGGERS_SUPPORTED in the
@@ -2936,6 +2940,7 @@ struct nl80211_wowlan_pattern_support {
         __u32 max_patterns;
         __u32 min_pattern_len;
         __u32 max_pattern_len;
+        __u32 max_pkt_offset;
 } __attribute__((packed));
 
 /**
@@ -2951,9 +2956,10 @@ struct nl80211_wowlan_pattern_support {
  * @NL80211_WOWLAN_TRIG_PKT_PATTERN: wake up on the specified packet patterns
  *      which are passed in an array of nested attributes, each nested attribute
  *      defining a with attributes from &struct nl80211_wowlan_trig_pkt_pattern.
- *      Each pattern defines a wakeup packet. The matching is done on the MSDU,
- *      i.e. as though the packet was an 802.3 packet, so the pattern matching
- *      is done after the packet is converted to the MSDU.
+ *      Each pattern defines a wakeup packet. Packet offset is associated with
+ *      each pattern which is used while matching the pattern. The matching is
+ *      done on the MSDU, i.e. as though the packet was an 802.3 packet, so the
+ *      pattern matching is done after the packet is converted to the MSDU.
  *
  *      In %NL80211_ATTR_WOWLAN_TRIGGERS_SUPPORTED, it is a binary attribute
  *      carrying a &struct nl80211_wowlan_pattern_support.