From ea5c3a2ffa0b7f4e720457821bfdd594516744d1 Mon Sep 17 00:00:00 2001 From: Andrea Claudi Date: Tue, 21 Apr 2020 14:32:49 +0200 Subject: [PATCH] tc: Add support for the CBS qdisc Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1557461 Upstream Status: iproute2.git commit c9681ac1b3e0c commit c9681ac1b3e0cd7b8e8b8cba17ac7090775ca647 Author: Vinicius Costa Gomes Date: Thu Oct 26 10:17:48 2017 -0700 tc: Add support for the CBS qdisc The Credit Based Shaper (CBS) queueing discipline allows bandwidth reservation with sub-milisecond precision. It is defined by the 802.1Q-2014 specification (section 8.6.8.2 and Annex L). The syntax is: tc qdisc add dev DEV parent NODE cbs locredit hicredit sendslope idleslope (The order is not important) Signed-off-by: Vinicius Costa Gomes Signed-off-by: Jeff Kirsher --- tc/Makefile | 1 + tc/q_cbs.c | 142 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 143 insertions(+) create mode 100644 tc/q_cbs.c diff --git a/tc/Makefile b/tc/Makefile index 9a6bb1ddea57e..6b4e5f2b20762 100644 --- a/tc/Makefile +++ b/tc/Makefile @@ -72,6 +72,7 @@ TCMODULES += q_hhf.o TCMODULES += q_clsact.o TCMODULES += e_bpf.o TCMODULES += f_matchall.o +TCMODULES += q_cbs.o TCSO := ifeq ($(TC_CONFIG_ATM),y) diff --git a/tc/q_cbs.c b/tc/q_cbs.c new file mode 100644 index 0000000000000..e53be6548ad9a --- /dev/null +++ b/tc/q_cbs.c @@ -0,0 +1,142 @@ +/* + * q_cbs.c CBS. + * + * 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: Vinicius Costa Gomes + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "utils.h" +#include "tc_util.h" + +static void explain(void) +{ + fprintf(stderr, "Usage: ... cbs hicredit BYTES locredit BYTES sendslope BPS idleslope BPS\n"); + fprintf(stderr, " [offload 0|1]\n"); + +} + +static void explain1(const char *arg, const char *val) +{ + fprintf(stderr, "cbs: illegal value for \"%s\": \"%s\"\n", arg, val); +} + +static int cbs_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n) +{ + struct tc_cbs_qopt opt = {}; + struct rtattr *tail; + + while (argc > 0) { + if (matches(*argv, "offload") == 0) { + NEXT_ARG(); + if (opt.offload) { + fprintf(stderr, "cbs: duplicate \"offload\" specification\n"); + return -1; + } + if (get_u8(&opt.offload, *argv, 0)) { + explain1("offload", *argv); + return -1; + } + } else if (matches(*argv, "hicredit") == 0) { + NEXT_ARG(); + if (opt.hicredit) { + fprintf(stderr, "cbs: duplicate \"hicredit\" specification\n"); + return -1; + } + if (get_s32(&opt.hicredit, *argv, 0)) { + explain1("hicredit", *argv); + return -1; + } + } else if (matches(*argv, "locredit") == 0) { + NEXT_ARG(); + if (opt.locredit) { + fprintf(stderr, "cbs: duplicate \"locredit\" specification\n"); + return -1; + } + if (get_s32(&opt.locredit, *argv, 0)) { + explain1("locredit", *argv); + return -1; + } + } else if (matches(*argv, "sendslope") == 0) { + NEXT_ARG(); + if (opt.sendslope) { + fprintf(stderr, "cbs: duplicate \"sendslope\" specification\n"); + return -1; + } + if (get_s32(&opt.sendslope, *argv, 0)) { + explain1("sendslope", *argv); + return -1; + } + } else if (matches(*argv, "idleslope") == 0) { + NEXT_ARG(); + if (opt.idleslope) { + fprintf(stderr, "cbs: duplicate \"idleslope\" specification\n"); + return -1; + } + if (get_s32(&opt.idleslope, *argv, 0)) { + explain1("idleslope", *argv); + return -1; + } + } else if (strcmp(*argv, "help") == 0) { + explain(); + return -1; + } else { + fprintf(stderr, "cbs: unknown parameter \"%s\"\n", *argv); + explain(); + return -1; + } + argc--; argv++; + } + + tail = NLMSG_TAIL(n); + addattr_l(n, 1024, TCA_OPTIONS, NULL, 0); + addattr_l(n, 2024, TCA_CBS_PARMS, &opt, sizeof(opt)); + tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail; + return 0; +} + +static int cbs_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt) +{ + struct rtattr *tb[TCA_CBS_MAX+1]; + struct tc_cbs_qopt *qopt; + + if (opt == NULL) + return 0; + + parse_rtattr_nested(tb, TCA_CBS_MAX, opt); + + if (tb[TCA_CBS_PARMS] == NULL) + return -1; + + qopt = RTA_DATA(tb[TCA_CBS_PARMS]); + if (RTA_PAYLOAD(tb[TCA_CBS_PARMS]) < sizeof(*qopt)) + return -1; + + fprintf(f, "hicredit %d ", qopt->hicredit); + fprintf(f, "locredit %d ", qopt->locredit); + fprintf(f, "sendslope %d ", qopt->sendslope); + fprintf(f, "idleslope %d ", qopt->idleslope); + fprintf(f, "offload %d ", qopt->offload); + + return 0; +} + +struct qdisc_util cbs_qdisc_util = { + .id = "cbs", + .parse_qopt = cbs_parse_opt, + .print_qopt = cbs_print_opt, +}; -- 2.25.3