package/network/utils/iw/patches/010-dynack.patch

   1
   2
   3 Add auto parameter to set distance command in order to enable ACK timeout
   4 estimation algorithm (dynack). Dynack is automatically disabled setting valid
   5 value for coverage class. Currently dynack is supported just by ath9k
   6
   7 This patch is based on "configure dynack through mac80211/cfg80211 stack"
   8 patchset sent on linux-wireless
   9
  10 Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
  11 ---
  12  info.c    |  2 ++
  13  nl80211.h | 12 ++++++++++++
  14  phy.c     | 43 +++++++++++++++++++++++++------------------
  15  3 files changed, 39 insertions(+), 18 deletions(-)
  16
  17 --- a/info.c
  18 +++ b/info.c
  19 @@ -551,6 +551,8 @@ broken_combination:
  20                         printf("\tDevice supports scan flush.\n");
  21                 if (features & NL80211_FEATURE_AP_SCAN)
  22                         printf("\tDevice supports AP scan.\n");
  23 +               if (features & NL80211_FEATURE_ACKTO_ESTIMATION)
  24 +                       printf("\tDevice supports ACK timeout estimation.\n");
  25         }
  26
  27         if (tb_msg[NL80211_ATTR_TDLS_SUPPORT])
  28 --- a/phy.c
  29 +++ b/phy.c
  30 @@ -362,39 +362,46 @@ static int handle_distance(struct nl8021
  31                         int argc, char **argv,
  32                         enum id_input id)
  33  {
  34 -       char *end;
  35 -       unsigned int distance, coverage;
  36 -
  37         if (argc != 1)
  38                 return 1;
  39
  40         if (!*argv[0])
  41                 return 1;
  42
  43 -       distance = strtoul(argv[0], &end, 10);
  44 +       if (strcmp("auto", argv[0]) == 0) {
  45 +               NLA_PUT_FLAG(msg, NL80211_ATTR_WIPHY_DYN_ACK);
  46 +       } else {
  47 +               char *end;
  48 +               unsigned int distance, coverage;
  49
  50 -       if (*end)
  51 -               return 1;
  52 +               distance = strtoul(argv[0], &end, 10);
  53
  54 -       /*
  55 -        * Divide double the distance by the speed of light in m/usec (300) to
  56 -        * get round-trip time in microseconds and then divide the result by
  57 -        * three to get coverage class as specified in IEEE 802.11-2007 table
  58 -        * 7-27. Values are rounded upwards.
  59 -        */
  60 -       coverage = (distance + 449) / 450;
  61 -       if (coverage > 255)
  62 -               return 1;
  63 +               if (*end)
  64 +                       return 1;
  65 +
  66 +               /*
  67 +                * Divide double the distance by the speed of light
  68 +                * in m/usec (300) to get round-trip time in microseconds
  69 +                * and then divide the result by three to get coverage class
  70 +                * as specified in IEEE 802.11-2007 table 7-27.
  71 +                * Values are rounded upwards.
  72 +                */
  73 +               coverage = (distance + 449) / 450;
  74 +               if (coverage > 255)
  75 +                       return 1;
  76
  77 -       NLA_PUT_U8(msg, NL80211_ATTR_WIPHY_COVERAGE_CLASS, coverage);
  78 +               NLA_PUT_U8(msg, NL80211_ATTR_WIPHY_COVERAGE_CLASS, coverage);
  79 +       }
  80
  81         return 0;
  82   nla_put_failure:
  83         return -ENOBUFS;
  84  }
  85 -COMMAND(set, distance, "<distance>",
  86 +COMMAND(set, distance, "<auto|distance>",
  87         NL80211_CMD_SET_WIPHY, 0, CIB_PHY, handle_distance,
  88 -       "Set appropriate coverage class for given link distance in meters.\n"
  89 +       "Enable ACK timeout estimation algorithm (dynack) or set appropriate\n"
  90 +       "coverage class for given link distance in meters.\n"
  91 +       "To disable dynack set valid value for coverage class.\n"
  92         "Valid values: 0 - 114750");
  93
  94  static int handle_txpower(struct nl80211_state *state,