Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* net/sched/sch_atm.c - ATM VC selection "queueing discipline" */ |
2 | ||
3 | /* Written 1998-2000 by Werner Almesberger, EPFL ICA */ | |
4 | ||
1da177e4 | 5 | #include <linux/module.h> |
5a0e3ad6 | 6 | #include <linux/slab.h> |
1da177e4 LT |
7 | #include <linux/init.h> |
8 | #include <linux/string.h> | |
9 | #include <linux/errno.h> | |
10 | #include <linux/skbuff.h> | |
1da177e4 LT |
11 | #include <linux/atmdev.h> |
12 | #include <linux/atmclip.h> | |
1da177e4 | 13 | #include <linux/rtnetlink.h> |
b0188d4d | 14 | #include <linux/file.h> /* for fput */ |
dc5fc579 | 15 | #include <net/netlink.h> |
1da177e4 | 16 | #include <net/pkt_sched.h> |
1da177e4 | 17 | |
b0188d4d | 18 | extern struct socket *sockfd_lookup(int fd, int *err); /* @@@ fix this */ |
1da177e4 | 19 | |
1da177e4 LT |
20 | /* |
21 | * The ATM queuing discipline provides a framework for invoking classifiers | |
22 | * (aka "filters"), which in turn select classes of this queuing discipline. | |
23 | * Each class maps the flow(s) it is handling to a given VC. Multiple classes | |
24 | * may share the same VC. | |
25 | * | |
26 | * When creating a class, VCs are specified by passing the number of the open | |
27 | * socket descriptor by which the calling process references the VC. The kernel | |
28 | * keeps the VC open at least until all classes using it are removed. | |
29 | * | |
30 | * In this file, most functions are named atm_tc_* to avoid confusion with all | |
31 | * the atm_* in net/atm. This naming convention differs from what's used in the | |
32 | * rest of net/sched. | |
33 | * | |
34 | * Known bugs: | |
35 | * - sometimes messes up the IP stack | |
36 | * - any manipulations besides the few operations described in the README, are | |
37 | * untested and likely to crash the system | |
38 | * - should lock the flow while there is data in the queue (?) | |
39 | */ | |
40 | ||
1da177e4 LT |
41 | #define VCC2FLOW(vcc) ((struct atm_flow_data *) ((vcc)->user_back)) |
42 | ||
1da177e4 | 43 | struct atm_flow_data { |
b0188d4d | 44 | struct Qdisc *q; /* FIFO, TBF, etc. */ |
1da177e4 | 45 | struct tcf_proto *filter_list; |
b0188d4d PM |
46 | struct atm_vcc *vcc; /* VCC; NULL if VCC is closed */ |
47 | void (*old_pop)(struct atm_vcc *vcc, | |
786a9036 | 48 | struct sk_buff *skb); /* chaining */ |
1da177e4 LT |
49 | struct atm_qdisc_data *parent; /* parent qdisc */ |
50 | struct socket *sock; /* for closing */ | |
51 | u32 classid; /* x:y type ID */ | |
52 | int ref; /* reference count */ | |
c1a8f1f1 | 53 | struct gnet_stats_basic_packed bstats; |
1da177e4 | 54 | struct gnet_stats_queue qstats; |
6accec76 | 55 | struct list_head list; |
1da177e4 LT |
56 | struct atm_flow_data *excess; /* flow for excess traffic; |
57 | NULL to set CLP instead */ | |
58 | int hdr_len; | |
59 | unsigned char hdr[0]; /* header data; MUST BE LAST */ | |
60 | }; | |
61 | ||
62 | struct atm_qdisc_data { | |
63 | struct atm_flow_data link; /* unclassified skbs go here */ | |
6accec76 | 64 | struct list_head flows; /* NB: "link" is also on this |
1da177e4 | 65 | list */ |
f30ab418 | 66 | struct tasklet_struct task; /* dequeue tasklet */ |
1da177e4 LT |
67 | }; |
68 | ||
1da177e4 LT |
69 | /* ------------------------- Class/flow operations ------------------------- */ |
70 | ||
b0188d4d | 71 | static inline struct atm_flow_data *lookup_flow(struct Qdisc *sch, u32 classid) |
1da177e4 | 72 | { |
786a9036 | 73 | struct atm_qdisc_data *p = qdisc_priv(sch); |
1da177e4 LT |
74 | struct atm_flow_data *flow; |
75 | ||
6accec76 | 76 | list_for_each_entry(flow, &p->flows, list) { |
b0188d4d | 77 | if (flow->classid == classid) |
6accec76 DM |
78 | return flow; |
79 | } | |
80 | return NULL; | |
1da177e4 LT |
81 | } |
82 | ||
b0188d4d PM |
83 | static int atm_tc_graft(struct Qdisc *sch, unsigned long arg, |
84 | struct Qdisc *new, struct Qdisc **old) | |
1da177e4 | 85 | { |
786a9036 | 86 | struct atm_qdisc_data *p = qdisc_priv(sch); |
b0188d4d PM |
87 | struct atm_flow_data *flow = (struct atm_flow_data *)arg; |
88 | ||
786a9036 | 89 | pr_debug("atm_tc_graft(sch %p,[qdisc %p],flow %p,new %p,old %p)\n", |
b0188d4d | 90 | sch, p, flow, new, old); |
6accec76 | 91 | if (list_empty(&flow->list)) |
b0188d4d PM |
92 | return -EINVAL; |
93 | if (!new) | |
94 | new = &noop_qdisc; | |
b94c8afc PM |
95 | *old = flow->q; |
96 | flow->q = new; | |
b0188d4d PM |
97 | if (*old) |
98 | qdisc_reset(*old); | |
10297b99 | 99 | return 0; |
1da177e4 LT |
100 | } |
101 | ||
b0188d4d | 102 | static struct Qdisc *atm_tc_leaf(struct Qdisc *sch, unsigned long cl) |
1da177e4 | 103 | { |
b0188d4d | 104 | struct atm_flow_data *flow = (struct atm_flow_data *)cl; |
1da177e4 | 105 | |
786a9036 | 106 | pr_debug("atm_tc_leaf(sch %p,flow %p)\n", sch, flow); |
1da177e4 LT |
107 | return flow ? flow->q : NULL; |
108 | } | |
109 | ||
b0188d4d | 110 | static unsigned long atm_tc_get(struct Qdisc *sch, u32 classid) |
1da177e4 | 111 | { |
786a9036 | 112 | struct atm_qdisc_data *p __maybe_unused = qdisc_priv(sch); |
1da177e4 LT |
113 | struct atm_flow_data *flow; |
114 | ||
786a9036 | 115 | pr_debug("atm_tc_get(sch %p,[qdisc %p],classid %x)\n", sch, p, classid); |
b0188d4d PM |
116 | flow = lookup_flow(sch, classid); |
117 | if (flow) | |
118 | flow->ref++; | |
786a9036 | 119 | pr_debug("atm_tc_get: flow %p\n", flow); |
b0188d4d | 120 | return (unsigned long)flow; |
1da177e4 LT |
121 | } |
122 | ||
1da177e4 | 123 | static unsigned long atm_tc_bind_filter(struct Qdisc *sch, |
b0188d4d | 124 | unsigned long parent, u32 classid) |
1da177e4 | 125 | { |
b0188d4d | 126 | return atm_tc_get(sch, classid); |
1da177e4 LT |
127 | } |
128 | ||
1da177e4 LT |
129 | /* |
130 | * atm_tc_put handles all destructions, including the ones that are explicitly | |
131 | * requested (atm_tc_destroy, etc.). The assumption here is that we never drop | |
132 | * anything that still seems to be in use. | |
133 | */ | |
1da177e4 LT |
134 | static void atm_tc_put(struct Qdisc *sch, unsigned long cl) |
135 | { | |
786a9036 | 136 | struct atm_qdisc_data *p = qdisc_priv(sch); |
b0188d4d | 137 | struct atm_flow_data *flow = (struct atm_flow_data *)cl; |
1da177e4 | 138 | |
786a9036 | 139 | pr_debug("atm_tc_put(sch %p,[qdisc %p],flow %p)\n", sch, p, flow); |
b0188d4d PM |
140 | if (--flow->ref) |
141 | return; | |
786a9036 | 142 | pr_debug("atm_tc_put: destroying\n"); |
6accec76 | 143 | list_del_init(&flow->list); |
786a9036 | 144 | pr_debug("atm_tc_put: qdisc %p\n", flow->q); |
1da177e4 | 145 | qdisc_destroy(flow->q); |
ff31ab56 | 146 | tcf_destroy_chain(&flow->filter_list); |
1da177e4 | 147 | if (flow->sock) { |
516e0cc5 | 148 | pr_debug("atm_tc_put: f_count %ld\n", |
b0188d4d | 149 | file_count(flow->sock->file)); |
1da177e4 LT |
150 | flow->vcc->pop = flow->old_pop; |
151 | sockfd_put(flow->sock); | |
152 | } | |
b0188d4d PM |
153 | if (flow->excess) |
154 | atm_tc_put(sch, (unsigned long)flow->excess); | |
155 | if (flow != &p->link) | |
156 | kfree(flow); | |
1da177e4 LT |
157 | /* |
158 | * If flow == &p->link, the qdisc no longer works at this point and | |
159 | * needs to be removed. (By the caller of atm_tc_put.) | |
160 | */ | |
161 | } | |
162 | ||
b0188d4d | 163 | static void sch_atm_pop(struct atm_vcc *vcc, struct sk_buff *skb) |
1da177e4 LT |
164 | { |
165 | struct atm_qdisc_data *p = VCC2FLOW(vcc)->parent; | |
166 | ||
786a9036 | 167 | pr_debug("sch_atm_pop(vcc %p,skb %p,[qdisc %p])\n", vcc, skb, p); |
b0188d4d | 168 | VCC2FLOW(vcc)->old_pop(vcc, skb); |
1da177e4 LT |
169 | tasklet_schedule(&p->task); |
170 | } | |
171 | ||
172 | static const u8 llc_oui_ip[] = { | |
b0188d4d PM |
173 | 0xaa, /* DSAP: non-ISO */ |
174 | 0xaa, /* SSAP: non-ISO */ | |
175 | 0x03, /* Ctrl: Unnumbered Information Command PDU */ | |
176 | 0x00, /* OUI: EtherType */ | |
1da177e4 | 177 | 0x00, 0x00, |
b0188d4d PM |
178 | 0x08, 0x00 |
179 | }; /* Ethertype IP (0800) */ | |
1da177e4 | 180 | |
27a3421e PM |
181 | static const struct nla_policy atm_policy[TCA_ATM_MAX + 1] = { |
182 | [TCA_ATM_FD] = { .type = NLA_U32 }, | |
183 | [TCA_ATM_EXCESS] = { .type = NLA_U32 }, | |
184 | }; | |
185 | ||
1da177e4 | 186 | static int atm_tc_change(struct Qdisc *sch, u32 classid, u32 parent, |
1e90474c | 187 | struct nlattr **tca, unsigned long *arg) |
1da177e4 | 188 | { |
786a9036 | 189 | struct atm_qdisc_data *p = qdisc_priv(sch); |
b0188d4d | 190 | struct atm_flow_data *flow = (struct atm_flow_data *)*arg; |
1da177e4 | 191 | struct atm_flow_data *excess = NULL; |
1e90474c PM |
192 | struct nlattr *opt = tca[TCA_OPTIONS]; |
193 | struct nlattr *tb[TCA_ATM_MAX + 1]; | |
1da177e4 | 194 | struct socket *sock; |
b0188d4d | 195 | int fd, error, hdr_len; |
1da177e4 LT |
196 | void *hdr; |
197 | ||
786a9036 | 198 | pr_debug("atm_tc_change(sch %p,[qdisc %p],classid %x,parent %x," |
b0188d4d | 199 | "flow %p,opt %p)\n", sch, p, classid, parent, flow, opt); |
1da177e4 LT |
200 | /* |
201 | * The concept of parents doesn't apply for this qdisc. | |
202 | */ | |
203 | if (parent && parent != TC_H_ROOT && parent != sch->handle) | |
204 | return -EINVAL; | |
205 | /* | |
206 | * ATM classes cannot be changed. In order to change properties of the | |
207 | * ATM connection, that socket needs to be modified directly (via the | |
208 | * native ATM API. In order to send a flow to a different VC, the old | |
209 | * class needs to be removed and a new one added. (This may be changed | |
210 | * later.) | |
211 | */ | |
b0188d4d PM |
212 | if (flow) |
213 | return -EBUSY; | |
cee63723 | 214 | if (opt == NULL) |
1da177e4 | 215 | return -EINVAL; |
27a3421e PM |
216 | |
217 | error = nla_parse_nested(tb, TCA_ATM_MAX, opt, atm_policy); | |
cee63723 PM |
218 | if (error < 0) |
219 | return error; | |
220 | ||
27a3421e | 221 | if (!tb[TCA_ATM_FD]) |
1da177e4 | 222 | return -EINVAL; |
1587bac4 | 223 | fd = nla_get_u32(tb[TCA_ATM_FD]); |
786a9036 | 224 | pr_debug("atm_tc_change: fd %d\n", fd); |
1e90474c PM |
225 | if (tb[TCA_ATM_HDR]) { |
226 | hdr_len = nla_len(tb[TCA_ATM_HDR]); | |
227 | hdr = nla_data(tb[TCA_ATM_HDR]); | |
b0188d4d | 228 | } else { |
1da177e4 | 229 | hdr_len = RFC1483LLC_LEN; |
b0188d4d | 230 | hdr = NULL; /* default LLC/SNAP for IP */ |
1da177e4 | 231 | } |
1e90474c | 232 | if (!tb[TCA_ATM_EXCESS]) |
b0188d4d | 233 | excess = NULL; |
1da177e4 | 234 | else { |
b0188d4d | 235 | excess = (struct atm_flow_data *) |
1587bac4 | 236 | atm_tc_get(sch, nla_get_u32(tb[TCA_ATM_EXCESS])); |
b0188d4d PM |
237 | if (!excess) |
238 | return -ENOENT; | |
1da177e4 | 239 | } |
f5e5cb75 | 240 | pr_debug("atm_tc_change: type %d, payload %d, hdr_len %d\n", |
1e90474c | 241 | opt->nla_type, nla_len(opt), hdr_len); |
786a9036 SH |
242 | sock = sockfd_lookup(fd, &error); |
243 | if (!sock) | |
b0188d4d | 244 | return error; /* f_count++ */ |
516e0cc5 | 245 | pr_debug("atm_tc_change: f_count %ld\n", file_count(sock->file)); |
10297b99 | 246 | if (sock->ops->family != PF_ATMSVC && sock->ops->family != PF_ATMPVC) { |
1da177e4 | 247 | error = -EPROTOTYPE; |
10297b99 | 248 | goto err_out; |
1da177e4 LT |
249 | } |
250 | /* @@@ should check if the socket is really operational or we'll crash | |
251 | on vcc->send */ | |
252 | if (classid) { | |
253 | if (TC_H_MAJ(classid ^ sch->handle)) { | |
786a9036 | 254 | pr_debug("atm_tc_change: classid mismatch\n"); |
1da177e4 LT |
255 | error = -EINVAL; |
256 | goto err_out; | |
257 | } | |
b0188d4d | 258 | } else { |
1da177e4 LT |
259 | int i; |
260 | unsigned long cl; | |
261 | ||
262 | for (i = 1; i < 0x8000; i++) { | |
b0188d4d | 263 | classid = TC_H_MAKE(sch->handle, 0x8000 | i); |
786a9036 SH |
264 | cl = atm_tc_get(sch, classid); |
265 | if (!cl) | |
b0188d4d PM |
266 | break; |
267 | atm_tc_put(sch, cl); | |
1da177e4 LT |
268 | } |
269 | } | |
786a9036 | 270 | pr_debug("atm_tc_change: new id %x\n", classid); |
782f7956 | 271 | flow = kzalloc(sizeof(struct atm_flow_data) + hdr_len, GFP_KERNEL); |
786a9036 | 272 | pr_debug("atm_tc_change: flow %p\n", flow); |
1da177e4 LT |
273 | if (!flow) { |
274 | error = -ENOBUFS; | |
275 | goto err_out; | |
276 | } | |
1da177e4 | 277 | flow->filter_list = NULL; |
5ce2d488 | 278 | flow->q = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue, |
bb949fbd | 279 | &pfifo_qdisc_ops, classid); |
786a9036 | 280 | if (!flow->q) |
1da177e4 | 281 | flow->q = &noop_qdisc; |
786a9036 | 282 | pr_debug("atm_tc_change: qdisc %p\n", flow->q); |
1da177e4 | 283 | flow->sock = sock; |
b0188d4d | 284 | flow->vcc = ATM_SD(sock); /* speedup */ |
1da177e4 | 285 | flow->vcc->user_back = flow; |
786a9036 | 286 | pr_debug("atm_tc_change: vcc %p\n", flow->vcc); |
1da177e4 LT |
287 | flow->old_pop = flow->vcc->pop; |
288 | flow->parent = p; | |
289 | flow->vcc->pop = sch_atm_pop; | |
290 | flow->classid = classid; | |
291 | flow->ref = 1; | |
292 | flow->excess = excess; | |
6accec76 | 293 | list_add(&flow->list, &p->link.list); |
1da177e4 LT |
294 | flow->hdr_len = hdr_len; |
295 | if (hdr) | |
b0188d4d | 296 | memcpy(flow->hdr, hdr, hdr_len); |
1da177e4 | 297 | else |
b0188d4d PM |
298 | memcpy(flow->hdr, llc_oui_ip, sizeof(llc_oui_ip)); |
299 | *arg = (unsigned long)flow; | |
1da177e4 LT |
300 | return 0; |
301 | err_out: | |
b0188d4d PM |
302 | if (excess) |
303 | atm_tc_put(sch, (unsigned long)excess); | |
1da177e4 LT |
304 | sockfd_put(sock); |
305 | return error; | |
306 | } | |
307 | ||
b0188d4d | 308 | static int atm_tc_delete(struct Qdisc *sch, unsigned long arg) |
1da177e4 | 309 | { |
786a9036 | 310 | struct atm_qdisc_data *p = qdisc_priv(sch); |
b0188d4d | 311 | struct atm_flow_data *flow = (struct atm_flow_data *)arg; |
1da177e4 | 312 | |
786a9036 | 313 | pr_debug("atm_tc_delete(sch %p,[qdisc %p],flow %p)\n", sch, p, flow); |
6accec76 | 314 | if (list_empty(&flow->list)) |
b0188d4d PM |
315 | return -EINVAL; |
316 | if (flow->filter_list || flow == &p->link) | |
317 | return -EBUSY; | |
1da177e4 LT |
318 | /* |
319 | * Reference count must be 2: one for "keepalive" (set at class | |
320 | * creation), and one for the reference held when calling delete. | |
321 | */ | |
322 | if (flow->ref < 2) { | |
b0188d4d | 323 | printk(KERN_ERR "atm_tc_delete: flow->ref == %d\n", flow->ref); |
1da177e4 LT |
324 | return -EINVAL; |
325 | } | |
b0188d4d PM |
326 | if (flow->ref > 2) |
327 | return -EBUSY; /* catch references via excess, etc. */ | |
328 | atm_tc_put(sch, arg); | |
1da177e4 LT |
329 | return 0; |
330 | } | |
331 | ||
b0188d4d | 332 | static void atm_tc_walk(struct Qdisc *sch, struct qdisc_walker *walker) |
1da177e4 | 333 | { |
786a9036 | 334 | struct atm_qdisc_data *p = qdisc_priv(sch); |
1da177e4 LT |
335 | struct atm_flow_data *flow; |
336 | ||
786a9036 | 337 | pr_debug("atm_tc_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker); |
b0188d4d PM |
338 | if (walker->stop) |
339 | return; | |
6accec76 DM |
340 | list_for_each_entry(flow, &p->flows, list) { |
341 | if (walker->count >= walker->skip && | |
342 | walker->fn(sch, (unsigned long)flow, walker) < 0) { | |
343 | walker->stop = 1; | |
344 | break; | |
345 | } | |
1da177e4 LT |
346 | walker->count++; |
347 | } | |
348 | } | |
349 | ||
b0188d4d | 350 | static struct tcf_proto **atm_tc_find_tcf(struct Qdisc *sch, unsigned long cl) |
1da177e4 | 351 | { |
786a9036 | 352 | struct atm_qdisc_data *p = qdisc_priv(sch); |
b0188d4d | 353 | struct atm_flow_data *flow = (struct atm_flow_data *)cl; |
1da177e4 | 354 | |
786a9036 | 355 | pr_debug("atm_tc_find_tcf(sch %p,[qdisc %p],flow %p)\n", sch, p, flow); |
10297b99 | 356 | return flow ? &flow->filter_list : &p->link.filter_list; |
1da177e4 LT |
357 | } |
358 | ||
1da177e4 LT |
359 | /* --------------------------- Qdisc operations ---------------------------- */ |
360 | ||
b0188d4d | 361 | static int atm_tc_enqueue(struct sk_buff *skb, struct Qdisc *sch) |
1da177e4 | 362 | { |
786a9036 | 363 | struct atm_qdisc_data *p = qdisc_priv(sch); |
6accec76 | 364 | struct atm_flow_data *flow; |
1da177e4 LT |
365 | struct tcf_result res; |
366 | int result; | |
367 | int ret = NET_XMIT_POLICED; | |
368 | ||
786a9036 | 369 | pr_debug("atm_tc_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p); |
b0188d4d | 370 | result = TC_POLICE_OK; /* be nice to gcc */ |
6accec76 | 371 | flow = NULL; |
1da177e4 | 372 | if (TC_H_MAJ(skb->priority) != sch->handle || |
6accec76 DM |
373 | !(flow = (struct atm_flow_data *)atm_tc_get(sch, skb->priority))) { |
374 | list_for_each_entry(flow, &p->flows, list) { | |
1da177e4 | 375 | if (flow->filter_list) { |
73ca4918 PM |
376 | result = tc_classify_compat(skb, |
377 | flow->filter_list, | |
378 | &res); | |
b0188d4d PM |
379 | if (result < 0) |
380 | continue; | |
381 | flow = (struct atm_flow_data *)res.class; | |
382 | if (!flow) | |
383 | flow = lookup_flow(sch, res.classid); | |
6accec76 | 384 | goto done; |
1da177e4 | 385 | } |
6accec76 DM |
386 | } |
387 | flow = NULL; | |
388 | done: | |
389 | ; | |
390 | } | |
b0188d4d PM |
391 | if (!flow) |
392 | flow = &p->link; | |
1da177e4 LT |
393 | else { |
394 | if (flow->vcc) | |
395 | ATM_SKB(skb)->atm_options = flow->vcc->atm_options; | |
b0188d4d | 396 | /*@@@ looks good ... but it's not supposed to work :-) */ |
92100804 PM |
397 | #ifdef CONFIG_NET_CLS_ACT |
398 | switch (result) { | |
399 | case TC_ACT_QUEUED: | |
400 | case TC_ACT_STOLEN: | |
401 | kfree_skb(skb); | |
378a2f09 | 402 | return NET_XMIT_SUCCESS | __NET_XMIT_STOLEN; |
92100804 PM |
403 | case TC_ACT_SHOT: |
404 | kfree_skb(skb); | |
405 | goto drop; | |
73ca4918 PM |
406 | case TC_POLICE_RECLASSIFY: |
407 | if (flow->excess) | |
408 | flow = flow->excess; | |
409 | else | |
410 | ATM_SKB(skb)->atm_options |= ATM_ATMOPT_CLP; | |
411 | break; | |
92100804 | 412 | } |
1da177e4 LT |
413 | #endif |
414 | } | |
c3bc7cff | 415 | |
5f86173b | 416 | ret = qdisc_enqueue(skb, flow->q); |
9871e50e | 417 | if (ret != NET_XMIT_SUCCESS) { |
92100804 | 418 | drop: __maybe_unused |
378a2f09 JP |
419 | if (net_xmit_drop_count(ret)) { |
420 | sch->qstats.drops++; | |
421 | if (flow) | |
422 | flow->qstats.drops++; | |
423 | } | |
1da177e4 LT |
424 | return ret; |
425 | } | |
0abf77e5 | 426 | sch->bstats.bytes += qdisc_pkt_len(skb); |
1da177e4 | 427 | sch->bstats.packets++; |
0abf77e5 | 428 | flow->bstats.bytes += qdisc_pkt_len(skb); |
1da177e4 LT |
429 | flow->bstats.packets++; |
430 | /* | |
431 | * Okay, this may seem weird. We pretend we've dropped the packet if | |
432 | * it goes via ATM. The reason for this is that the outer qdisc | |
433 | * expects to be able to q->dequeue the packet later on if we return | |
434 | * success at this place. Also, sch->q.qdisc needs to reflect whether | |
435 | * there is a packet egligible for dequeuing or not. Note that the | |
436 | * statistics of the outer qdisc are necessarily wrong because of all | |
437 | * this. There's currently no correct solution for this. | |
438 | */ | |
439 | if (flow == &p->link) { | |
440 | sch->q.qlen++; | |
9871e50e | 441 | return NET_XMIT_SUCCESS; |
1da177e4 LT |
442 | } |
443 | tasklet_schedule(&p->task); | |
c27f339a | 444 | return NET_XMIT_SUCCESS | __NET_XMIT_BYPASS; |
1da177e4 LT |
445 | } |
446 | ||
1da177e4 LT |
447 | /* |
448 | * Dequeue packets and send them over ATM. Note that we quite deliberately | |
449 | * avoid checking net_device's flow control here, simply because sch_atm | |
450 | * uses its own channels, which have nothing to do with any CLIP/LANE/or | |
451 | * non-ATM interfaces. | |
452 | */ | |
453 | ||
1da177e4 LT |
454 | static void sch_atm_dequeue(unsigned long data) |
455 | { | |
b0188d4d | 456 | struct Qdisc *sch = (struct Qdisc *)data; |
786a9036 | 457 | struct atm_qdisc_data *p = qdisc_priv(sch); |
1da177e4 LT |
458 | struct atm_flow_data *flow; |
459 | struct sk_buff *skb; | |
460 | ||
786a9036 | 461 | pr_debug("sch_atm_dequeue(sch %p,[qdisc %p])\n", sch, p); |
6accec76 DM |
462 | list_for_each_entry(flow, &p->flows, list) { |
463 | if (flow == &p->link) | |
464 | continue; | |
1da177e4 LT |
465 | /* |
466 | * If traffic is properly shaped, this won't generate nasty | |
467 | * little bursts. Otherwise, it may ... (but that's okay) | |
468 | */ | |
03c05f0d JP |
469 | while ((skb = flow->q->ops->peek(flow->q))) { |
470 | if (!atm_may_send(flow->vcc, skb->truesize)) | |
1da177e4 | 471 | break; |
03c05f0d | 472 | |
77be155c | 473 | skb = qdisc_dequeue_peeked(flow->q); |
03c05f0d JP |
474 | if (unlikely(!skb)) |
475 | break; | |
476 | ||
786a9036 | 477 | pr_debug("atm_tc_dequeue: sending on class %p\n", flow); |
1da177e4 | 478 | /* remove any LL header somebody else has attached */ |
eddc9ec5 | 479 | skb_pull(skb, skb_network_offset(skb)); |
1da177e4 LT |
480 | if (skb_headroom(skb) < flow->hdr_len) { |
481 | struct sk_buff *new; | |
482 | ||
b0188d4d | 483 | new = skb_realloc_headroom(skb, flow->hdr_len); |
1da177e4 | 484 | dev_kfree_skb(skb); |
b0188d4d PM |
485 | if (!new) |
486 | continue; | |
1da177e4 LT |
487 | skb = new; |
488 | } | |
786a9036 | 489 | pr_debug("sch_atm_dequeue: ip %p, data %p\n", |
eddc9ec5 | 490 | skb_network_header(skb), skb->data); |
1da177e4 | 491 | ATM_SKB(skb)->vcc = flow->vcc; |
b0188d4d PM |
492 | memcpy(skb_push(skb, flow->hdr_len), flow->hdr, |
493 | flow->hdr_len); | |
1da177e4 LT |
494 | atomic_add(skb->truesize, |
495 | &sk_atm(flow->vcc)->sk_wmem_alloc); | |
496 | /* atm.atm_options are already set by atm_tc_enqueue */ | |
b0188d4d | 497 | flow->vcc->send(flow->vcc, skb); |
1da177e4 | 498 | } |
6accec76 | 499 | } |
1da177e4 LT |
500 | } |
501 | ||
1da177e4 LT |
502 | static struct sk_buff *atm_tc_dequeue(struct Qdisc *sch) |
503 | { | |
786a9036 | 504 | struct atm_qdisc_data *p = qdisc_priv(sch); |
1da177e4 LT |
505 | struct sk_buff *skb; |
506 | ||
786a9036 | 507 | pr_debug("atm_tc_dequeue(sch %p,[qdisc %p])\n", sch, p); |
1da177e4 | 508 | tasklet_schedule(&p->task); |
77be155c | 509 | skb = qdisc_dequeue_peeked(p->link.q); |
b0188d4d PM |
510 | if (skb) |
511 | sch->q.qlen--; | |
1da177e4 LT |
512 | return skb; |
513 | } | |
514 | ||
8e3af978 JP |
515 | static struct sk_buff *atm_tc_peek(struct Qdisc *sch) |
516 | { | |
517 | struct atm_qdisc_data *p = qdisc_priv(sch); | |
518 | ||
519 | pr_debug("atm_tc_peek(sch %p,[qdisc %p])\n", sch, p); | |
520 | ||
521 | return p->link.q->ops->peek(p->link.q); | |
522 | } | |
523 | ||
1da177e4 LT |
524 | static unsigned int atm_tc_drop(struct Qdisc *sch) |
525 | { | |
786a9036 | 526 | struct atm_qdisc_data *p = qdisc_priv(sch); |
1da177e4 LT |
527 | struct atm_flow_data *flow; |
528 | unsigned int len; | |
529 | ||
786a9036 | 530 | pr_debug("atm_tc_drop(sch %p,[qdisc %p])\n", sch, p); |
6accec76 | 531 | list_for_each_entry(flow, &p->flows, list) { |
1da177e4 LT |
532 | if (flow->q->ops->drop && (len = flow->q->ops->drop(flow->q))) |
533 | return len; | |
6accec76 | 534 | } |
1da177e4 LT |
535 | return 0; |
536 | } | |
537 | ||
1e90474c | 538 | static int atm_tc_init(struct Qdisc *sch, struct nlattr *opt) |
1da177e4 | 539 | { |
786a9036 | 540 | struct atm_qdisc_data *p = qdisc_priv(sch); |
1da177e4 | 541 | |
786a9036 | 542 | pr_debug("atm_tc_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt); |
6accec76 DM |
543 | INIT_LIST_HEAD(&p->flows); |
544 | INIT_LIST_HEAD(&p->link.list); | |
545 | list_add(&p->link.list, &p->flows); | |
5ce2d488 | 546 | p->link.q = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue, |
bb949fbd | 547 | &pfifo_qdisc_ops, sch->handle); |
786a9036 | 548 | if (!p->link.q) |
1da177e4 | 549 | p->link.q = &noop_qdisc; |
786a9036 | 550 | pr_debug("atm_tc_init: link (%p) qdisc %p\n", &p->link, p->link.q); |
1da177e4 LT |
551 | p->link.filter_list = NULL; |
552 | p->link.vcc = NULL; | |
553 | p->link.sock = NULL; | |
554 | p->link.classid = sch->handle; | |
555 | p->link.ref = 1; | |
b0188d4d | 556 | tasklet_init(&p->task, sch_atm_dequeue, (unsigned long)sch); |
1da177e4 LT |
557 | return 0; |
558 | } | |
559 | ||
1da177e4 LT |
560 | static void atm_tc_reset(struct Qdisc *sch) |
561 | { | |
786a9036 | 562 | struct atm_qdisc_data *p = qdisc_priv(sch); |
1da177e4 LT |
563 | struct atm_flow_data *flow; |
564 | ||
786a9036 | 565 | pr_debug("atm_tc_reset(sch %p,[qdisc %p])\n", sch, p); |
6accec76 | 566 | list_for_each_entry(flow, &p->flows, list) |
b0188d4d | 567 | qdisc_reset(flow->q); |
1da177e4 LT |
568 | sch->q.qlen = 0; |
569 | } | |
570 | ||
1da177e4 LT |
571 | static void atm_tc_destroy(struct Qdisc *sch) |
572 | { | |
786a9036 | 573 | struct atm_qdisc_data *p = qdisc_priv(sch); |
6accec76 | 574 | struct atm_flow_data *flow, *tmp; |
1da177e4 | 575 | |
786a9036 | 576 | pr_debug("atm_tc_destroy(sch %p,[qdisc %p])\n", sch, p); |
6accec76 | 577 | list_for_each_entry(flow, &p->flows, list) |
a4aebb83 PM |
578 | tcf_destroy_chain(&flow->filter_list); |
579 | ||
6accec76 | 580 | list_for_each_entry_safe(flow, tmp, &p->flows, list) { |
1da177e4 | 581 | if (flow->ref > 1) |
b0188d4d PM |
582 | printk(KERN_ERR "atm_destroy: %p->ref = %d\n", flow, |
583 | flow->ref); | |
584 | atm_tc_put(sch, (unsigned long)flow); | |
1da177e4 LT |
585 | } |
586 | tasklet_kill(&p->task); | |
587 | } | |
588 | ||
1da177e4 | 589 | static int atm_tc_dump_class(struct Qdisc *sch, unsigned long cl, |
b0188d4d | 590 | struct sk_buff *skb, struct tcmsg *tcm) |
1da177e4 | 591 | { |
786a9036 | 592 | struct atm_qdisc_data *p = qdisc_priv(sch); |
b0188d4d | 593 | struct atm_flow_data *flow = (struct atm_flow_data *)cl; |
4b3550ef | 594 | struct nlattr *nest; |
1da177e4 | 595 | |
786a9036 | 596 | pr_debug("atm_tc_dump_class(sch %p,[qdisc %p],flow %p,skb %p,tcm %p)\n", |
b0188d4d | 597 | sch, p, flow, skb, tcm); |
6accec76 | 598 | if (list_empty(&flow->list)) |
b0188d4d | 599 | return -EINVAL; |
1da177e4 | 600 | tcm->tcm_handle = flow->classid; |
cdc7f8e3 | 601 | tcm->tcm_info = flow->q->handle; |
4b3550ef PM |
602 | |
603 | nest = nla_nest_start(skb, TCA_OPTIONS); | |
604 | if (nest == NULL) | |
605 | goto nla_put_failure; | |
606 | ||
1e90474c | 607 | NLA_PUT(skb, TCA_ATM_HDR, flow->hdr_len, flow->hdr); |
1da177e4 LT |
608 | if (flow->vcc) { |
609 | struct sockaddr_atmpvc pvc; | |
610 | int state; | |
611 | ||
612 | pvc.sap_family = AF_ATMPVC; | |
613 | pvc.sap_addr.itf = flow->vcc->dev ? flow->vcc->dev->number : -1; | |
614 | pvc.sap_addr.vpi = flow->vcc->vpi; | |
615 | pvc.sap_addr.vci = flow->vcc->vci; | |
1e90474c | 616 | NLA_PUT(skb, TCA_ATM_ADDR, sizeof(pvc), &pvc); |
1da177e4 | 617 | state = ATM_VF2VS(flow->vcc->flags); |
24beeab5 | 618 | NLA_PUT_U32(skb, TCA_ATM_STATE, state); |
1da177e4 LT |
619 | } |
620 | if (flow->excess) | |
24beeab5 | 621 | NLA_PUT_U32(skb, TCA_ATM_EXCESS, flow->classid); |
1da177e4 | 622 | else { |
24beeab5 | 623 | NLA_PUT_U32(skb, TCA_ATM_EXCESS, 0); |
1da177e4 | 624 | } |
4b3550ef PM |
625 | |
626 | nla_nest_end(skb, nest); | |
1da177e4 LT |
627 | return skb->len; |
628 | ||
1e90474c | 629 | nla_put_failure: |
4b3550ef | 630 | nla_nest_cancel(skb, nest); |
1da177e4 LT |
631 | return -1; |
632 | } | |
633 | static int | |
634 | atm_tc_dump_class_stats(struct Qdisc *sch, unsigned long arg, | |
b0188d4d | 635 | struct gnet_dump *d) |
1da177e4 | 636 | { |
b0188d4d | 637 | struct atm_flow_data *flow = (struct atm_flow_data *)arg; |
1da177e4 LT |
638 | |
639 | flow->qstats.qlen = flow->q->q.qlen; | |
640 | ||
641 | if (gnet_stats_copy_basic(d, &flow->bstats) < 0 || | |
642 | gnet_stats_copy_queue(d, &flow->qstats) < 0) | |
643 | return -1; | |
644 | ||
645 | return 0; | |
646 | } | |
647 | ||
648 | static int atm_tc_dump(struct Qdisc *sch, struct sk_buff *skb) | |
649 | { | |
650 | return 0; | |
651 | } | |
652 | ||
20fea08b | 653 | static const struct Qdisc_class_ops atm_class_ops = { |
b0188d4d PM |
654 | .graft = atm_tc_graft, |
655 | .leaf = atm_tc_leaf, | |
656 | .get = atm_tc_get, | |
657 | .put = atm_tc_put, | |
658 | .change = atm_tc_change, | |
659 | .delete = atm_tc_delete, | |
660 | .walk = atm_tc_walk, | |
661 | .tcf_chain = atm_tc_find_tcf, | |
662 | .bind_tcf = atm_tc_bind_filter, | |
663 | .unbind_tcf = atm_tc_put, | |
664 | .dump = atm_tc_dump_class, | |
665 | .dump_stats = atm_tc_dump_class_stats, | |
1da177e4 LT |
666 | }; |
667 | ||
20fea08b | 668 | static struct Qdisc_ops atm_qdisc_ops __read_mostly = { |
b0188d4d PM |
669 | .cl_ops = &atm_class_ops, |
670 | .id = "atm", | |
671 | .priv_size = sizeof(struct atm_qdisc_data), | |
672 | .enqueue = atm_tc_enqueue, | |
673 | .dequeue = atm_tc_dequeue, | |
8e3af978 | 674 | .peek = atm_tc_peek, |
b0188d4d PM |
675 | .drop = atm_tc_drop, |
676 | .init = atm_tc_init, | |
677 | .reset = atm_tc_reset, | |
678 | .destroy = atm_tc_destroy, | |
679 | .dump = atm_tc_dump, | |
680 | .owner = THIS_MODULE, | |
1da177e4 LT |
681 | }; |
682 | ||
1da177e4 LT |
683 | static int __init atm_init(void) |
684 | { | |
685 | return register_qdisc(&atm_qdisc_ops); | |
686 | } | |
687 | ||
10297b99 | 688 | static void __exit atm_exit(void) |
1da177e4 LT |
689 | { |
690 | unregister_qdisc(&atm_qdisc_ops); | |
691 | } | |
692 | ||
693 | module_init(atm_init) | |
694 | module_exit(atm_exit) | |
695 | MODULE_LICENSE("GPL"); |