2 * lib/route/sch/prio.c PRIO Qdisc/Class
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation version 2.1
9 * Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch>
14 * @defgroup prio (Fast) Prio
17 * @par 1) Typical PRIO configuration
19 * // Specify the maximal number of bands to be used for this PRIO qdisc.
20 * rtnl_qdisc_prio_set_bands(qdisc, QDISC_PRIO_DEFAULT_BANDS);
22 * // Provide a map assigning each priority to a band number.
23 * uint8_t map[] = QDISC_PRIO_DEFAULT_PRIOMAP;
24 * rtnl_qdisc_prio_set_priomap(qdisc, map, sizeof(map));
29 #include <netlink-local.h>
30 #include <netlink-tc.h>
31 #include <netlink/netlink.h>
32 #include <netlink/utils.h>
33 #include <netlink/route/qdisc.h>
34 #include <netlink/route/qdisc-modules.h>
35 #include <netlink/route/sch/prio.h>
38 #define SCH_PRIO_ATTR_BANDS 1
39 #define SCH_PRIO_ATTR_PRIOMAP 2
42 static inline struct rtnl_prio *prio_qdisc(struct rtnl_qdisc *qdisc)
44 return (struct rtnl_prio *) qdisc->q_subdata;
47 static inline struct rtnl_prio *prio_alloc(struct rtnl_qdisc *qdisc)
49 if (!qdisc->q_subdata)
50 qdisc->q_subdata = calloc(1, sizeof(struct rtnl_prio));
52 return prio_qdisc(qdisc);
55 static int prio_msg_parser(struct rtnl_qdisc *qdisc)
57 struct rtnl_prio *prio;
58 struct tc_prio_qopt *opt;
60 if (qdisc->q_opts->d_size < sizeof(*opt))
63 prio = prio_alloc(qdisc);
67 opt = (struct tc_prio_qopt *) qdisc->q_opts->d_data;
68 prio->qp_bands = opt->bands;
69 memcpy(prio->qp_priomap, opt->priomap, sizeof(prio->qp_priomap));
70 prio->qp_mask = (SCH_PRIO_ATTR_BANDS | SCH_PRIO_ATTR_PRIOMAP);
75 static void prio_free_data(struct rtnl_qdisc *qdisc)
77 free(qdisc->q_subdata);
80 static void prio_dump_line(struct rtnl_qdisc *qdisc, struct nl_dump_params *p)
82 struct rtnl_prio *prio = prio_qdisc(qdisc);
85 nl_dump(p, " bands %u", prio->qp_bands);
88 static void prio_dump_details(struct rtnl_qdisc *qdisc,struct nl_dump_params *p)
90 struct rtnl_prio *prio = prio_qdisc(qdisc);
96 nl_dump(p, "priomap [");
98 for (i = 0; i <= TC_PRIO_MAX; i++)
99 nl_dump(p, "%u%s", prio->qp_priomap[i],
100 i < TC_PRIO_MAX ? " " : "");
105 hp = (((TC_PRIO_MAX/2) + 1) & ~1);
107 for (i = 0; i < hp; i++) {
109 nl_dump(p, " %18s => %u",
110 rtnl_prio2str(i, a, sizeof(a)),
111 prio->qp_priomap[i]);
112 if (hp+i <= TC_PRIO_MAX) {
113 nl_dump(p, " %18s => %u",
114 rtnl_prio2str(hp+i, a, sizeof(a)),
115 prio->qp_priomap[hp+i]);
124 static struct nl_msg *prio_get_opts(struct rtnl_qdisc *qdisc)
126 struct rtnl_prio *prio;
127 struct tc_prio_qopt opts;
130 prio = prio_qdisc(qdisc);
132 !(prio->qp_mask & SCH_PRIO_ATTR_PRIOMAP))
135 opts.bands = prio->qp_bands;
136 memcpy(opts.priomap, prio->qp_priomap, sizeof(opts.priomap));
142 if (nlmsg_append(msg, &opts, sizeof(opts), NL_DONTPAD) < 0) {
153 * @name Attribute Modification
158 * Set number of bands of PRIO qdisc.
159 * @arg qdisc PRIO qdisc to be modified.
160 * @arg bands New number of bands.
161 * @return 0 on success or a negative error code.
163 int rtnl_qdisc_prio_set_bands(struct rtnl_qdisc *qdisc, int bands)
165 struct rtnl_prio *prio;
167 prio = prio_alloc(qdisc);
171 prio->qp_bands = bands;
172 prio->qp_mask |= SCH_PRIO_ATTR_BANDS;
178 * Get number of bands of PRIO qdisc.
179 * @arg qdisc PRIO qdisc.
180 * @return Number of bands or a negative error code.
182 int rtnl_qdisc_prio_get_bands(struct rtnl_qdisc *qdisc)
184 struct rtnl_prio *prio;
186 prio = prio_qdisc(qdisc);
187 if (prio && prio->qp_mask & SCH_PRIO_ATTR_BANDS)
188 return prio->qp_bands;
194 * Set priomap of the PRIO qdisc.
195 * @arg qdisc PRIO qdisc to be modified.
196 * @arg priomap New priority mapping.
197 * @arg len Length of priomap (# of elements).
198 * @return 0 on success or a negative error code.
200 int rtnl_qdisc_prio_set_priomap(struct rtnl_qdisc *qdisc, uint8_t priomap[],
203 struct rtnl_prio *prio;
206 prio = prio_alloc(qdisc);
210 if (!(prio->qp_mask & SCH_PRIO_ATTR_BANDS))
211 return -NLE_MISSING_ATTR;
213 if ((len / sizeof(uint8_t)) > (TC_PRIO_MAX+1))
216 for (i = 0; i <= TC_PRIO_MAX; i++) {
217 if (priomap[i] > prio->qp_bands)
221 memcpy(prio->qp_priomap, priomap, len);
222 prio->qp_mask |= SCH_PRIO_ATTR_PRIOMAP;
228 * Get priomap of a PRIO qdisc.
229 * @arg qdisc PRIO qdisc.
230 * @return Priority mapping as array of size TC_PRIO_MAX+1
231 * or NULL if an error occured.
233 uint8_t *rtnl_qdisc_prio_get_priomap(struct rtnl_qdisc *qdisc)
235 struct rtnl_prio *prio;
237 prio = prio_qdisc(qdisc);
238 if (prio && prio->qp_mask & SCH_PRIO_ATTR_PRIOMAP)
239 return prio->qp_priomap;
247 * @name Priority Band Translations
251 static struct trans_tbl prios[] = {
252 __ADD(TC_PRIO_BESTEFFORT,besteffort)
253 __ADD(TC_PRIO_FILLER,filler)
254 __ADD(TC_PRIO_BULK,bulk)
255 __ADD(TC_PRIO_INTERACTIVE_BULK,interactive_bulk)
256 __ADD(TC_PRIO_INTERACTIVE,interactive)
257 __ADD(TC_PRIO_CONTROL,control)
261 * Convert priority to character string.
262 * @arg prio Priority.
263 * @arg buf Destination buffer
264 * @arg size Size of destination buffer.
266 * Converts a priority to a character string and stores the result in
267 * the specified destination buffer.
269 * @return Name of priority as character string.
271 char * rtnl_prio2str(int prio, char *buf, size_t size)
273 return __type2str(prio, buf, size, prios, ARRAY_SIZE(prios));
277 * Convert character string to priority.
278 * @arg name Name of priority.
280 * Converts the provided character string specifying a priority
281 * to the corresponding numeric value.
283 * @return Numeric priority or a negative value if no match was found.
285 int rtnl_str2prio(const char *name)
287 return __str2type(name, prios, ARRAY_SIZE(prios));
292 static struct rtnl_qdisc_ops prio_ops = {
294 .qo_msg_parser = prio_msg_parser,
295 .qo_free_data = prio_free_data,
297 [NL_DUMP_LINE] = prio_dump_line,
298 [NL_DUMP_DETAILS] = prio_dump_details,
300 .qo_get_opts = prio_get_opts,
303 static struct rtnl_qdisc_ops pfifo_fast_ops = {
304 .qo_kind = "pfifo_fast",
305 .qo_msg_parser = prio_msg_parser,
306 .qo_free_data = prio_free_data,
308 [NL_DUMP_LINE] = prio_dump_line,
309 [NL_DUMP_DETAILS] = prio_dump_details,
311 .qo_get_opts = prio_get_opts,
314 static void __init prio_init(void)
316 rtnl_qdisc_register(&prio_ops);
317 rtnl_qdisc_register(&pfifo_fast_ops);
320 static void __exit prio_exit(void)
322 rtnl_qdisc_unregister(&prio_ops);
323 rtnl_qdisc_unregister(&pfifo_fast_ops);