rlim qdisc support

Add support for new rate limit qdisc

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>

diff --git a/tc/q_rlim.c b/tc/q_rlim.c
new file mode 100644 (file)
index 0000000..c90796d
--- /dev/null
+++ b/tc/q_rlim.c
@@ -0,0 +1,129 @@
+/*
+ * q_rtlim.c           RTLIM.
+ *
+ *             This program is free software; you can redistribute it and/or
+ *             modify it under the terms of the GNU General Public License
+ *             as published by the Free Software Foundation; either version
+ *             2 of the License, or (at your option) any later version.
+ *
+ * Authors:    Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <syslog.h>
+#include <fcntl.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <string.h>
+
+#include "utils.h"
+#include "tc_util.h"
+
+static void explain(void)
+{
+       fprintf(stderr, 
+               "Usage: ... rlim limit PACKETS rate KBPS [ overhead BYTES ]\n");
+}
+
+static void explain1(char *arg)
+{
+       fprintf(stderr, "Illegal \"%s\"\n", arg);
+}
+
+
+#define usage() return(-1)
+
+static int rlim_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
+{
+       unsigned x;
+       struct tc_rlim_qopt opt = { 
+               .overhead = 24,         /* Ether IPG + Preamble + CRC */
+       };
+       struct rtattr *tail;
+
+       while (argc > 0) {
+               if (matches(*argv, "limit") == 0) {
+                       NEXT_ARG();
+                       if (opt.limit) {
+                               fprintf(stderr, "Double \"limit\" spec\n");
+                               return -1;
+                       }
+                       if (get_size(&opt.limit, *argv)) {
+                               explain1("limit");
+                               return -1;
+                       }
+               } else if (strcmp(*argv, "rate") == 0) {
+                       NEXT_ARG();
+                       if (opt.rate) {
+                               fprintf(stderr, "Double \"rate\" spec\n");
+                               return -1;
+                       }
+
+                       if (get_rate(&x, *argv)) {
+                               explain1("rate");
+                               return -1;
+                       }
+                       opt.rate = x;
+               } else if (strcmp(*argv, "help") == 0) {
+                       explain();
+                       return -1;
+               } else {
+                       fprintf(stderr, "What is \"%s\"?\n", *argv);
+                       explain();
+                       return -1;
+               }
+               argc--; argv++;
+       }
+
+       if (opt.rate == 0) {
+               fprintf(stderr, "\"rate\" is required.\n");
+               return -1;
+       }
+
+       if (opt.limit == 0)
+               opt.limit = 1000;
+
+       tail = NLMSG_TAIL(n);
+       addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
+       addattr_l(n, 2024, TCA_RLIM_PARMS, &opt, sizeof(opt));
+       tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
+
+       return 0;
+}
+
+static int rlim_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
+{
+       struct rtattr *tb[TCA_RLIM_PARMS+1];
+       struct tc_rlim_qopt *qopt;
+       SPRINT_BUF(b1);
+       SPRINT_BUF(b2);
+
+       if (opt == NULL)
+               return 0;
+
+       parse_rtattr_nested(tb, TCA_RLIM_PARMS, opt);
+       if (tb[TCA_RLIM_PARMS] == NULL)
+               return -1;
+
+       qopt = RTA_DATA(tb[TCA_RLIM_PARMS]);
+       if (RTA_PAYLOAD(tb[TCA_RLIM_PARMS])  < sizeof(*qopt))
+               return -1;
+
+       fprintf(f, "limit %s rate %s overhead %u", 
+               sprint_size(qopt->limit, b1),
+               sprint_rate(qopt->rate, b2),
+               qopt->overhead);
+
+       return 0;
+}
+
+struct qdisc_util rlim_qdisc_util = {
+       .id             = "rlim",
+       .parse_qopt     = rlim_parse_opt,
+       .print_qopt     = rlim_print_opt,
+};
+