package/iproute2/patches/003-iproute2-htb_overhead.patch

   1 --- a/tc/q_htb.c
   2 +++ b/tc/q_htb.c
   3 @@ -35,10 +35,14 @@ static void explain(void)
   4                 " default  minor id of class to which unclassified packets are sent {0}\n"
   5                 " r2q      DRR quantums are computed as rate in Bps/r2q {10}\n"
   6                 " debug    string of 16 numbers each 0-3 {0}\n\n"
   7 -               "... class add ... htb rate R1 burst B1 [prio P] [slot S] [pslot PS]\n"
   8 +               "... class add ... htb rate R1 [burst B1] [mpu B] [overhead O]\n"
   9 +               "                      [prio P] [slot S] [pslot PS]\n"
  10                 "                      [ceil R2] [cburst B2] [mtu MTU] [quantum Q]\n"
  11                 " rate     rate allocated to this class (class can still borrow)\n"
  12                 " burst    max bytes burst which can be accumulated during idle period {computed}\n"
  13 +               " mpu      minimum packet size used in rate computations\n"
  14 +               " overhead per-packet size overhead used in rate computations\n"
  15 +
  16                 " ceil     definite upper class rate (no borrows) {rate}\n"
  17                 " cburst   burst but for ceil {computed}\n"
  18                 " mtu      max packet size we create rate map for {1600}\n"
  19 @@ -103,7 +107,9 @@ static int htb_parse_class_opt(struct qd
  20         struct tc_htb_opt opt;
  21         __u32 rtab[256],ctab[256];
  22         unsigned buffer=0,cbuffer=0;
  23 -       int cell_log=-1,ccell_log = -1,mtu;
  24 +       int cell_log=-1,ccell_log = -1;
  25 +       unsigned mtu, mpu;
  26 +       unsigned char mpu8 = 0, overhead = 0;
  27         struct rtattr *tail;
  28
  29         memset(&opt, 0, sizeof(opt)); mtu = 1600; /* eth packet len */
  30 @@ -120,6 +126,16 @@ static int htb_parse_class_opt(struct qd
  31                         if (get_u32(&mtu, *argv, 10)) {
  32                                 explain1("mtu"); return -1;
  33                         }
  34 +               } else if (matches(*argv, "mpu") == 0) {
  35 +                       NEXT_ARG();
  36 +                       if (get_u8(&mpu8, *argv, 10)) {
  37 +                               explain1("mpu"); return -1;
  38 +                       }
  39 +               } else if (matches(*argv, "overhead") == 0) {
  40 +                       NEXT_ARG();
  41 +                       if (get_u8(&overhead, *argv, 10)) {
  42 +                               explain1("overhead"); return -1;
  43 +                       }
  44                 } else if (matches(*argv, "quantum") == 0) {
  45                         NEXT_ARG();
  46                         if (get_u32(&opt.quantum, *argv, 10)) {
  47 @@ -191,14 +207,18 @@ static int htb_parse_class_opt(struct qd
  48         if (!buffer) buffer = opt.rate.rate / HZ + mtu;
  49         if (!cbuffer) cbuffer = opt.ceil.rate / HZ + mtu;
  50
  51 -       if ((cell_log = tc_calc_rtable(opt.rate.rate, rtab, cell_log, mtu, 0)) < 0) {
  52 +/* encode overhead and mpu, 8 bits each, into lower 16 bits */
  53 +       mpu = (unsigned)mpu8 | (unsigned)overhead << 8;
  54 +       opt.ceil.mpu = mpu; opt.rate.mpu = mpu;
  55 +
  56 +       if ((cell_log = tc_calc_rtable(opt.rate.rate, rtab, cell_log, mtu, mpu)) < 0) {
  57                 fprintf(stderr, "htb: failed to calculate rate table.\n");
  58                 return -1;
  59         }
  60         opt.buffer = tc_calc_xmittime(opt.rate.rate, buffer);
  61         opt.rate.cell_log = cell_log;
  62
  63 -       if ((ccell_log = tc_calc_rtable(opt.ceil.rate, ctab, cell_log, mtu, 0)) < 0) {
  64 +       if ((ccell_log = tc_calc_rtable(opt.ceil.rate, ctab, cell_log, mtu, mpu)) < 0) {
  65                 fprintf(stderr, "htb: failed to calculate ceil rate table.\n");
  66                 return -1;
  67         }
  68 @@ -222,6 +242,7 @@ static int htb_print_opt(struct qdisc_ut
  69         double buffer,cbuffer;
  70         SPRINT_BUF(b1);
  71         SPRINT_BUF(b2);
  72 +       SPRINT_BUF(b3);
  73
  74         if (opt == NULL)
  75                 return 0;
  76 @@ -244,10 +265,16 @@ static int htb_print_opt(struct qdisc_ut
  77             fprintf(f, "ceil %s ", sprint_rate(hopt->ceil.rate, b1));
  78             cbuffer = ((double)hopt->ceil.rate*tc_core_tick2usec(hopt->cbuffer))/1000000;
  79             if (show_details) {
  80 -               fprintf(f, "burst %s/%u mpu %s ", sprint_size(buffer, b1),
  81 -                       1<<hopt->rate.cell_log, sprint_size(hopt->rate.mpu, b2));
  82 -               fprintf(f, "cburst %s/%u mpu %s ", sprint_size(cbuffer, b1),
  83 -                       1<<hopt->ceil.cell_log, sprint_size(hopt->ceil.mpu, b2));
  84 +               fprintf(f, "burst %s/%u mpu %s overhead %s ",
  85 +                       sprint_size(buffer, b1),
  86 +                       1<<hopt->rate.cell_log,
  87 +                       sprint_size(hopt->rate.mpu&0xFF, b2),
  88 +                       sprint_size((hopt->rate.mpu>>8)&0xFF, b3));
  89 +               fprintf(f, "cburst %s/%u mpu %s overhead %s ",
  90 +                       sprint_size(cbuffer, b1),
  91 +                       1<<hopt->ceil.cell_log,
  92 +                       sprint_size(hopt->ceil.mpu&0xFF, b2),
  93 +                       sprint_size((hopt->ceil.mpu>>8)&0xFF, b3));
  94                 fprintf(f, "level %d ", (int)hopt->level);
  95             } else {
  96                 fprintf(f, "burst %s ", sprint_size(buffer, b1));