carl9170 firmware: per-vif tx sequence counter

[carl9170fw.git] / carlfw / src / wlan.c

diff --git a/carlfw/src/wlan.c b/carlfw/src/wlan.c
index 794aa86f44ba9d29a37a7209f514c054cc4be038..c4cf0b3dfb0062b9957e706ab1ea76f1ea32a3f3 100644 (file)
--- a/carlfw/src/wlan.c
+++ b/carlfw/src/wlan.c
@@ -31,6 +31,7 @@
 #include "printf.h"
 #include "rf.h"
 #include "linux/ieee80211.h"
+#include "rom.h"
 
 static void wlan_txunstuck(unsigned int queue)
 {
@@ -295,11 +296,24 @@ static void __wlan_tx(struct dma_desc *desc)
 #endif /* CONFIG_CARL9170FW_LOOPBACK */
 }
 
+static void wlan_assign_seq(struct ieee80211_hdr *hdr, unsigned int vif)
+{
+       hdr->seq_ctrl &= cpu_to_le16(~IEEE80211_SCTL_SEQ);
+       hdr->seq_ctrl |= cpu_to_le16(fw.wlan.sequence[vif]);
+
+       if (!(hdr->seq_ctrl & cpu_to_le16(IEEE80211_SCTL_FRAG)))
+               fw.wlan.sequence[vif] += 0x10;
+}
+
 /* prepares frame for the first transmission */
 static void _wlan_tx(struct dma_desc *desc)
 {
        struct carl9170_tx_superframe *super = get_super(desc);
 
+       if (unlikely(super->s.assign_seq)) {
+               wlan_assign_seq(&super->f.data.i3e, super->s.vif_id);
+       }
+
        if (unlikely(super->s.ampdu_commit_density)) {
                set(AR9170_MAC_REG_AMPDU_DENSITY,
                    MOD_VAL(AR9170_MAC_AMPDU_DENSITY,
@@ -629,6 +643,83 @@ static void wlan_check_rx_overrun(void)
        }
 }
 
+#ifdef CONFIG_CARL9170FW_WOL
+static void wlan_rx_wol(struct ieee80211_hdr *hdr, unsigned int len)
+{
+       const unsigned char *data, *end, *mac;
+       unsigned int found = 0;
+
+       /*
+        * LIMITATION:
+        * We can only scan the first AR9170_BLOCK_SIZE [=~320] bytes
+        * for MAGIC patterns!
+        */
+
+       /*
+        * TODO:
+        * Currently, the MAGIC MAC Address is fixed to the EEPROM default.
+        * It's possible to make it fully configurable, e.g:
+        *
+        * mac = (const unsigned char *) AR9170_MAC_REG_MAC_ADDR_L;
+        * But this will clash with the driver's suspend path, because it
+        * needs to reset the registers.
+        */
+       mac = rom.sys.mac_address;
+
+       data = (u8 *)((unsigned long)hdr + ieee80211_hdrlen(hdr->frame_control));
+       end = (u8 *)((unsigned long)hdr + len);
+
+       /*
+        * scan for standard WOL Magic frame
+        *
+        * "A physical WakeOnLAN (Magic Packet) will look like this:
+        * ---------------------------------------------------------------
+        * | Synchronization Stream |  Target MAC |  Password (optional) |
+        * |    6 octets            |   96 octets |   0, 4 or 6          |
+        * ---------------------------------------------------------------
+        *
+        * The Synchronization Stream is defined as 6 bytes of FFh.
+        * The Target MAC block contains 16 duplications of the IEEEaddress
+        * of the target, with no breaks or interruptions.
+        *
+        * The Password field is optional, but if present, contains either
+        * 4 bytes or 6 bytes. The WakeOnLAN dissector was implemented to
+        * dissect the password, if present, according to the command-line
+        * format that ether-wake uses, therefore, if a 4-byte password is
+        * present, it will be dissected as an IPv4 address and if a 6-byte
+        * password is present, it will be dissected as an Ethernet address.
+        *
+        * <http://wiki.wireshark.org/WakeOnLAN>
+        */
+
+       while (data < end) {
+               if (found >= 6) {
+                       if (*data == mac[found % 6])
+                               found++;
+                       else
+                               found = 0;
+               }
+
+               /* previous check might reset found counter */
+               if (found < 6) {
+                       if (*data == 0xff)
+                               found++;
+                       else
+                               found = 0;
+               }
+
+               if (found == (6 + 16 * 6)) {
+                       fw.suspend_mode = CARL9170_AWAKE_HOST;
+                       return;
+               }
+
+               data++;
+       }
+
+       return;
+}
+#endif /* CONFIG_CARL9170FW_WOL */
+
 static unsigned int wlan_rx_filter(struct dma_desc *desc)
 {
        struct ieee80211_hdr *hdr;
@@ -683,6 +774,14 @@ static unsigned int wlan_rx_filter(struct dma_desc *desc)
                rx_filter |= CARL9170_RX_FILTER_MGMT;
        }
 
+#ifdef CONFIG_CARL9170FW_WOL
+       if (unlikely(fw.suspend_mode == CARL9170_HOST_SUSPENDED)) {
+               if (rx_filter & CARL9170_RX_FILTER_DATA)
+                       wlan_rx_wol(hdr, min(data_len,
+                                   (unsigned int)AR9170_BLOCK_SIZE));
+       }
+#endif /* CONFIG_CARL9170FW_WOL */
+
 #undef AR9170_RX_ERROR_BAD
 
        return rx_filter;
@@ -756,7 +855,7 @@ static uint8_t *beacon_find_ie(uint8_t ie, void *addr,
        return NULL;
 }
 
-void wlan_cab_modify_dtim_beacon(const unsigned int vif,
+void wlan_modify_beacon(const unsigned int vif,
        const unsigned int addr, const unsigned int len)
 {
        uint8_t *_ie;
@@ -781,6 +880,15 @@ void wlan_cab_modify_dtim_beacon(const unsigned int vif,
                        ie->bitmap_ctrl |= 0x1;
                }
        }
+
+       /*
+        * Ideally, the sequence number should be assigned by the TX arbiter
+        * hardware. But AFAIK that's not possible, so we have to go for the
+        * next best thing and write it into the beacon fifo during the open
+        * beacon update window.
+        */
+
+       wlan_assign_seq((struct ieee80211_hdr *)addr, vif);
 }
 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
 
@@ -791,8 +899,6 @@ static void handle_beacon_config(void)
        bcn_count = get(AR9170_MAC_REG_BCN_COUNT);
        send_cmd_to_host(4, CARL9170_RSP_BEACON_CONFIG, 0x00,
                         (uint8_t *) &bcn_count);
-
-       set(AR9170_MAC_REG_BCN_CTRL, AR9170_BCN_CTRL_READY);
 }
 
 static void handle_pretbtt(void)