| /* net/sched/sch_atm.c - ATM VC selection "queueing discipline" */ |
| |
| /* Written 1998-2000 by Werner Almesberger, EPFL ICA */ |
| |
| #include <linux/module.h> |
| #include <linux/slab.h> |
| #include <linux/init.h> |
| #include <linux/interrupt.h> |
| #include <linux/string.h> |
| #include <linux/errno.h> |
| #include <linux/skbuff.h> |
| #include <linux/atmdev.h> |
| #include <linux/atmclip.h> |
| #include <linux/rtnetlink.h> |
| #include <linux/file.h> /* for fput */ |
| #include <net/netlink.h> |
| #include <net/pkt_sched.h> |
| |
| /* |
| * The ATM queuing discipline provides a framework for invoking classifiers |
| * (aka "filters"), which in turn select classes of this queuing discipline. |
| * Each class maps the flow(s) it is handling to a given VC. Multiple classes |
| * may share the same VC. |
| * |
| * When creating a class, VCs are specified by passing the number of the open |
| * socket descriptor by which the calling process references the VC. The kernel |
| * keeps the VC open at least until all classes using it are removed. |
| * |
| * In this file, most functions are named atm_tc_* to avoid confusion with all |
| * the atm_* in net/atm. This naming convention differs from what's used in the |
| * rest of net/sched. |
| * |
| * Known bugs: |
| * - sometimes messes up the IP stack |
| * - any manipulations besides the few operations described in the README, are |
| * untested and likely to crash the system |
| * - should lock the flow while there is data in the queue (?) |
| */ |
| |
| #define VCC2FLOW(vcc) ((struct atm_flow_data *) ((vcc)->user_back)) |
| |
| struct atm_flow_data { |
| struct Qdisc *q; /* FIFO, TBF, etc. */ |
| struct tcf_proto __rcu *filter_list; |
| struct atm_vcc *vcc; /* VCC; NULL if VCC is closed */ |
| void (*old_pop)(struct atm_vcc *vcc, |
| struct sk_buff *skb); /* chaining */ |
| struct atm_qdisc_data *parent; /* parent qdisc */ |
| struct socket *sock; /* for closing */ |
| u32 classid; /* x:y type ID */ |
| int ref; /* reference count */ |
| struct gnet_stats_basic_packed bstats; |
| struct gnet_stats_queue qstats; |
| struct list_head list; |
| struct atm_flow_data *excess; /* flow for excess traffic; |
| NULL to set CLP instead */ |
| int hdr_len; |
| unsigned char hdr[0]; /* header data; MUST BE LAST */ |
| }; |
| |
| struct atm_qdisc_data { |
| struct atm_flow_data link; /* unclassified skbs go here */ |
| struct list_head flows; /* NB: "link" is also on this |
| list */ |
| struct tasklet_struct task; /* dequeue tasklet */ |
| }; |
| |
| /* ------------------------- Class/flow operations ------------------------- */ |
| |
| static inline struct atm_flow_data *lookup_flow(struct Qdisc *sch, u32 classid) |
| { |
| struct atm_qdisc_data *p = qdisc_priv(sch); |
| struct atm_flow_data *flow; |
| |
| list_for_each_entry(flow, &p->flows, list) { |
| if (flow->classid == classid) |
| return flow; |
| } |
| return NULL; |
| } |
| |
| static int atm_tc_graft(struct Qdisc *sch, unsigned long arg, |
| struct Qdisc *new, struct Qdisc **old) |
| { |
| struct atm_qdisc_data *p = qdisc_priv(sch); |
| struct atm_flow_data *flow = (struct atm_flow_data *)arg; |
| |
| pr_debug("atm_tc_graft(sch %p,[qdisc %p],flow %p,new %p,old %p)\n", |
| sch, p, flow, new, old); |
| if (list_empty(&flow->list)) |
| return -EINVAL; |
| if (!new) |
| new = &noop_qdisc; |
| *old = flow->q; |
| flow->q = new; |
| if (*old) |
| qdisc_reset(*old); |
| return 0; |
| } |
| |
| static struct Qdisc *atm_tc_leaf(struct Qdisc *sch, unsigned long cl) |
| { |
| struct atm_flow_data *flow = (struct atm_flow_data *)cl; |
| |
| pr_debug("atm_tc_leaf(sch %p,flow %p)\n", sch, flow); |
| return flow ? flow->q : NULL; |
| } |
| |
| static unsigned long atm_tc_get(struct Qdisc *sch, u32 classid) |
| { |
| struct atm_qdisc_data *p __maybe_unused = qdisc_priv(sch); |
| struct atm_flow_data *flow; |
| |
| pr_debug("atm_tc_get(sch %p,[qdisc %p],classid %x)\n", sch, p, classid); |
| flow = lookup_flow(sch, classid); |
| if (flow) |
| flow->ref++; |
| pr_debug("atm_tc_get: flow %p\n", flow); |
| return (unsigned long)flow; |
| } |
| |
| static unsigned long atm_tc_bind_filter(struct Qdisc *sch, |
| unsigned long parent, u32 classid) |
| { |
| return atm_tc_get(sch, classid); |
| } |
| |
| /* |
| * atm_tc_put handles all destructions, including the ones that are explicitly |
| * requested (atm_tc_destroy, etc.). The assumption here is that we never drop |
| * anything that still seems to be in use. |
| */ |
| static void atm_tc_put(struct Qdisc *sch, unsigned long cl) |
| { |
| struct atm_qdisc_data *p = qdisc_priv(sch); |
| struct atm_flow_data *flow = (struct atm_flow_data *)cl; |
| |
| pr_debug("atm_tc_put(sch %p,[qdisc %p],flow %p)\n", sch, p, flow); |
| if (--flow->ref) |
| return; |
| pr_debug("atm_tc_put: destroying\n"); |
| list_del_init(&flow->list); |
| pr_debug("atm_tc_put: qdisc %p\n", flow->q); |
| qdisc_destroy(flow->q); |
| tcf_destroy_chain(&flow->filter_list); |
| if (flow->sock) { |
| pr_debug("atm_tc_put: f_count %ld\n", |
| file_count(flow->sock->file)); |
| flow->vcc->pop = flow->old_pop; |
| sockfd_put(flow->sock); |
| } |
| if (flow->excess) |
| atm_tc_put(sch, (unsigned long)flow->excess); |
| if (flow != &p->link) |
| kfree(flow); |
| /* |
| * If flow == &p->link, the qdisc no longer works at this point and |
| * needs to be removed. (By the caller of atm_tc_put.) |
| */ |
| } |
| |
| static void sch_atm_pop(struct atm_vcc *vcc, struct sk_buff *skb) |
| { |
| struct atm_qdisc_data *p = VCC2FLOW(vcc)->parent; |
| |
| pr_debug("sch_atm_pop(vcc %p,skb %p,[qdisc %p])\n", vcc, skb, p); |
| VCC2FLOW(vcc)->old_pop(vcc, skb); |
| tasklet_schedule(&p->task); |
| } |
| |
| static const u8 llc_oui_ip[] = { |
| 0xaa, /* DSAP: non-ISO */ |
| 0xaa, /* SSAP: non-ISO */ |
| 0x03, /* Ctrl: Unnumbered Information Command PDU */ |
| 0x00, /* OUI: EtherType */ |
| 0x00, 0x00, |
| 0x08, 0x00 |
| }; /* Ethertype IP (0800) */ |
| |
| static const struct nla_policy atm_policy[TCA_ATM_MAX + 1] = { |
| [TCA_ATM_FD] = { .type = NLA_U32 }, |
| [TCA_ATM_EXCESS] = { .type = NLA_U32 }, |
| }; |
| |
| static int atm_tc_change(struct Qdisc *sch, u32 classid, u32 parent, |
| struct nlattr **tca, unsigned long *arg) |
| { |
| struct atm_qdisc_data *p = qdisc_priv(sch); |
| struct atm_flow_data *flow = (struct atm_flow_data *)*arg; |
| struct atm_flow_data *excess = NULL; |
| struct nlattr *opt = tca[TCA_OPTIONS]; |
| struct nlattr *tb[TCA_ATM_MAX + 1]; |
| struct socket *sock; |
| int fd, error, hdr_len; |
| void *hdr; |
| |
| pr_debug("atm_tc_change(sch %p,[qdisc %p],classid %x,parent %x," |
| "flow %p,opt %p)\n", sch, p, classid, parent, flow, opt); |
| /* |
| * The concept of parents doesn't apply for this qdisc. |
| */ |
| if (parent && parent != TC_H_ROOT && parent != sch->handle) |
| return -EINVAL; |
| /* |
| * ATM classes cannot be changed. In order to change properties of the |
| * ATM connection, that socket needs to be modified directly (via the |
| * native ATM API. In order to send a flow to a different VC, the old |
| * class needs to be removed and a new one added. (This may be changed |
| * later.) |
| */ |
| if (flow) |
| return -EBUSY; |
| if (opt == NULL) |
| return -EINVAL; |
| |
| error = nla_parse_nested(tb, TCA_ATM_MAX, opt, atm_policy); |
| if (error < 0) |
| return error; |
| |
| if (!tb[TCA_ATM_FD]) |
| return -EINVAL; |
| fd = nla_get_u32(tb[TCA_ATM_FD]); |
| pr_debug("atm_tc_change: fd %d\n", fd); |
| if (tb[TCA_ATM_HDR]) { |
| hdr_len = nla_len(tb[TCA_ATM_HDR]); |
| hdr = nla_data(tb[TCA_ATM_HDR]); |
| } else { |
| hdr_len = RFC1483LLC_LEN; |
| hdr = NULL; /* default LLC/SNAP for IP */ |
| } |
| if (!tb[TCA_ATM_EXCESS]) |
| excess = NULL; |
| else { |
| excess = (struct atm_flow_data *) |
| atm_tc_get(sch, nla_get_u32(tb[TCA_ATM_EXCESS])); |
| if (!excess) |
| return -ENOENT; |
| } |
| pr_debug("atm_tc_change: type %d, payload %d, hdr_len %d\n", |
| opt->nla_type, nla_len(opt), hdr_len); |
| sock = sockfd_lookup(fd, &error); |
| if (!sock) |
| return error; /* f_count++ */ |
| pr_debug("atm_tc_change: f_count %ld\n", file_count(sock->file)); |
| if (sock->ops->family != PF_ATMSVC && sock->ops->family != PF_ATMPVC) { |
| error = -EPROTOTYPE; |
| goto err_out; |
| } |
| /* @@@ should check if the socket is really operational or we'll crash |
| on vcc->send */ |
| if (classid) { |
| if (TC_H_MAJ(classid ^ sch->handle)) { |
| pr_debug("atm_tc_change: classid mismatch\n"); |
| error = -EINVAL; |
| goto err_out; |
| } |
| } else { |
| int i; |
| unsigned long cl; |
| |
| for (i = 1; i < 0x8000; i++) { |
| classid = TC_H_MAKE(sch->handle, 0x8000 | i); |
| cl = atm_tc_get(sch, classid); |
| if (!cl) |
| break; |
| atm_tc_put(sch, cl); |
| } |
| } |
| pr_debug("atm_tc_change: new id %x\n", classid); |
| flow = kzalloc(sizeof(struct atm_flow_data) + hdr_len, GFP_KERNEL); |
| pr_debug("atm_tc_change: flow %p\n", flow); |
| if (!flow) { |
| error = -ENOBUFS; |
| goto err_out; |
| } |
| RCU_INIT_POINTER(flow->filter_list, NULL); |
| flow->q = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops, classid); |
| if (!flow->q) |
| flow->q = &noop_qdisc; |
| pr_debug("atm_tc_change: qdisc %p\n", flow->q); |
| flow->sock = sock; |
| flow->vcc = ATM_SD(sock); /* speedup */ |
| flow->vcc->user_back = flow; |
| pr_debug("atm_tc_change: vcc %p\n", flow->vcc); |
| flow->old_pop = flow->vcc->pop; |
| flow->parent = p; |
| flow->vcc->pop = sch_atm_pop; |
| flow->classid = classid; |
| flow->ref = 1; |
| flow->excess = excess; |
| list_add(&flow->list, &p->link.list); |
| flow->hdr_len = hdr_len; |
| if (hdr) |
| memcpy(flow->hdr, hdr, hdr_len); |
| else |
| memcpy(flow->hdr, llc_oui_ip, sizeof(llc_oui_ip)); |
| *arg = (unsigned long)flow; |
| return 0; |
| err_out: |
| if (excess) |
| atm_tc_put(sch, (unsigned long)excess); |
| sockfd_put(sock); |
| return error; |
| } |
| |
| static int atm_tc_delete(struct Qdisc *sch, unsigned long arg) |
| { |
| struct atm_qdisc_data *p = qdisc_priv(sch); |
| struct atm_flow_data *flow = (struct atm_flow_data *)arg; |
| |
| pr_debug("atm_tc_delete(sch %p,[qdisc %p],flow %p)\n", sch, p, flow); |
| if (list_empty(&flow->list)) |
| return -EINVAL; |
| if (rcu_access_pointer(flow->filter_list) || flow == &p->link) |
| return -EBUSY; |
| /* |
| * Reference count must be 2: one for "keepalive" (set at class |
| * creation), and one for the reference held when calling delete. |
| */ |
| if (flow->ref < 2) { |
| pr_err("atm_tc_delete: flow->ref == %d\n", flow->ref); |
| return -EINVAL; |
| } |
| if (flow->ref > 2) |
| return -EBUSY; /* catch references via excess, etc. */ |
| atm_tc_put(sch, arg); |
| return 0; |
| } |
| |
| static void atm_tc_walk(struct Qdisc *sch, struct qdisc_walker *walker) |
| { |
| struct atm_qdisc_data *p = qdisc_priv(sch); |
| struct atm_flow_data *flow; |
| |
| pr_debug("atm_tc_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker); |
| if (walker->stop) |
| return; |
| list_for_each_entry(flow, &p->flows, list) { |
| if (walker->count >= walker->skip && |
| walker->fn(sch, (unsigned long)flow, walker) < 0) { |
| walker->stop = 1; |
| break; |
| } |
| walker->count++; |
| } |
| } |
| |
| static struct tcf_proto __rcu **atm_tc_find_tcf(struct Qdisc *sch, |
| unsigned long cl) |
| { |
| struct atm_qdisc_data *p = qdisc_priv(sch); |
| struct atm_flow_data *flow = (struct atm_flow_data *)cl; |
| |
| pr_debug("atm_tc_find_tcf(sch %p,[qdisc %p],flow %p)\n", sch, p, flow); |
| return flow ? &flow->filter_list : &p->link.filter_list; |
| } |
| |
| /* --------------------------- Qdisc operations ---------------------------- */ |
| |
| static int atm_tc_enqueue(struct sk_buff *skb, struct Qdisc *sch) |
| { |
| struct atm_qdisc_data *p = qdisc_priv(sch); |
| struct atm_flow_data *flow; |
| struct tcf_result res; |
| int result; |
| int ret = NET_XMIT_POLICED; |
| |
| pr_debug("atm_tc_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p); |
| result = TC_POLICE_OK; /* be nice to gcc */ |
| flow = NULL; |
| if (TC_H_MAJ(skb->priority) != sch->handle || |
| !(flow = (struct atm_flow_data *)atm_tc_get(sch, skb->priority))) { |
| struct tcf_proto *fl; |
| |
| list_for_each_entry(flow, &p->flows, list) { |
| fl = rcu_dereference_bh(flow->filter_list); |
| if (fl) { |
| result = tc_classify(skb, fl, &res, true); |
| if (result < 0) |
| continue; |
| flow = (struct atm_flow_data *)res.class; |
| if (!flow) |
| flow = lookup_flow(sch, res.classid); |
| goto done; |
| } |
| } |
| flow = NULL; |
| done: |
| ; |
| } |
| if (!flow) { |
| flow = &p->link; |
| } else { |
| if (flow->vcc) |
| ATM_SKB(skb)->atm_options = flow->vcc->atm_options; |
| /*@@@ looks good ... but it's not supposed to work :-) */ |
| #ifdef CONFIG_NET_CLS_ACT |
| switch (result) { |
| case TC_ACT_QUEUED: |
| case TC_ACT_STOLEN: |
| kfree_skb(skb); |
| return NET_XMIT_SUCCESS | __NET_XMIT_STOLEN; |
| case TC_ACT_SHOT: |
| kfree_skb(skb); |
| goto drop; |
| case TC_POLICE_RECLASSIFY: |
| if (flow->excess) |
| flow = flow->excess; |
| else |
| ATM_SKB(skb)->atm_options |= ATM_ATMOPT_CLP; |
| break; |
| } |
| #endif |
| } |
| |
| ret = qdisc_enqueue(skb, flow->q); |
| if (ret != NET_XMIT_SUCCESS) { |
| drop: __maybe_unused |
| if (net_xmit_drop_count(ret)) { |
| qdisc_qstats_drop(sch); |
| if (flow) |
| flow->qstats.drops++; |
| } |
| return ret; |
| } |
| /* |
| * Okay, this may seem weird. We pretend we've dropped the packet if |
| * it goes via ATM. The reason for this is that the outer qdisc |
| * expects to be able to q->dequeue the packet later on if we return |
| * success at this place. Also, sch->q.qdisc needs to reflect whether |
| * there is a packet egligible for dequeuing or not. Note that the |
| * statistics of the outer qdisc are necessarily wrong because of all |
| * this. There's currently no correct solution for this. |
| */ |
| if (flow == &p->link) { |
| sch->q.qlen++; |
| return NET_XMIT_SUCCESS; |
| } |
| tasklet_schedule(&p->task); |
| return NET_XMIT_SUCCESS | __NET_XMIT_BYPASS; |
| } |
| |
| /* |
| * Dequeue packets and send them over ATM. Note that we quite deliberately |
| * avoid checking net_device's flow control here, simply because sch_atm |
| * uses its own channels, which have nothing to do with any CLIP/LANE/or |
| * non-ATM interfaces. |
| */ |
| |
| static void sch_atm_dequeue(unsigned long data) |
| { |
| struct Qdisc *sch = (struct Qdisc *)data; |
| struct atm_qdisc_data *p = qdisc_priv(sch); |
| struct atm_flow_data *flow; |
| struct sk_buff *skb; |
| |
| pr_debug("sch_atm_dequeue(sch %p,[qdisc %p])\n", sch, p); |
| list_for_each_entry(flow, &p->flows, list) { |
| if (flow == &p->link) |
| continue; |
| /* |
| * If traffic is properly shaped, this won't generate nasty |
| * little bursts. Otherwise, it may ... (but that's okay) |
| */ |
| while ((skb = flow->q->ops->peek(flow->q))) { |
| if (!atm_may_send(flow->vcc, skb->truesize)) |
| break; |
| |
| skb = qdisc_dequeue_peeked(flow->q); |
| if (unlikely(!skb)) |
| break; |
| |
| qdisc_bstats_update(sch, skb); |
| bstats_update(&flow->bstats, skb); |
| pr_debug("atm_tc_dequeue: sending on class %p\n", flow); |
| /* remove any LL header somebody else has attached */ |
| skb_pull(skb, skb_network_offset(skb)); |
| if (skb_headroom(skb) < flow->hdr_len) { |
| struct sk_buff *new; |
| |
| new = skb_realloc_headroom(skb, flow->hdr_len); |
| dev_kfree_skb(skb); |
| if (!new) |
| continue; |
| skb = new; |
| } |
| pr_debug("sch_atm_dequeue: ip %p, data %p\n", |
| skb_network_header(skb), skb->data); |
| ATM_SKB(skb)->vcc = flow->vcc; |
| memcpy(skb_push(skb, flow->hdr_len), flow->hdr, |
| flow->hdr_len); |
| atomic_add(skb->truesize, |
| &sk_atm(flow->vcc)->sk_wmem_alloc); |
| /* atm.atm_options are already set by atm_tc_enqueue */ |
| flow->vcc->send(flow->vcc, skb); |
| } |
| } |
| } |
| |
| static struct sk_buff *atm_tc_dequeue(struct Qdisc *sch) |
| { |
| struct atm_qdisc_data *p = qdisc_priv(sch); |
| struct sk_buff *skb; |
| |
| pr_debug("atm_tc_dequeue(sch %p,[qdisc %p])\n", sch, p); |
| tasklet_schedule(&p->task); |
| skb = qdisc_dequeue_peeked(p->link.q); |
| if (skb) |
| sch->q.qlen--; |
| return skb; |
| } |
| |
| static struct sk_buff *atm_tc_peek(struct Qdisc *sch) |
| { |
| struct atm_qdisc_data *p = qdisc_priv(sch); |
| |
| pr_debug("atm_tc_peek(sch %p,[qdisc %p])\n", sch, p); |
| |
| return p->link.q->ops->peek(p->link.q); |
| } |
| |
| static int atm_tc_init(struct Qdisc *sch, struct nlattr *opt) |
| { |
| struct atm_qdisc_data *p = qdisc_priv(sch); |
| |
| pr_debug("atm_tc_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt); |
| INIT_LIST_HEAD(&p->flows); |
| INIT_LIST_HEAD(&p->link.list); |
| list_add(&p->link.list, &p->flows); |
| p->link.q = qdisc_create_dflt(sch->dev_queue, |
| &pfifo_qdisc_ops, sch->handle); |
| if (!p->link.q) |
| p->link.q = &noop_qdisc; |
| pr_debug("atm_tc_init: link (%p) qdisc %p\n", &p->link, p->link.q); |
| RCU_INIT_POINTER(p->link.filter_list, NULL); |
| p->link.vcc = NULL; |
| p->link.sock = NULL; |
| p->link.classid = sch->handle; |
| p->link.ref = 1; |
| tasklet_init(&p->task, sch_atm_dequeue, (unsigned long)sch); |
| return 0; |
| } |
| |
| static void atm_tc_reset(struct Qdisc *sch) |
| { |
| struct atm_qdisc_data *p = qdisc_priv(sch); |
| struct atm_flow_data *flow; |
| |
| pr_debug("atm_tc_reset(sch %p,[qdisc %p])\n", sch, p); |
| list_for_each_entry(flow, &p->flows, list) |
| qdisc_reset(flow->q); |
| sch->q.qlen = 0; |
| } |
| |
| static void atm_tc_destroy(struct Qdisc *sch) |
| { |
| struct atm_qdisc_data *p = qdisc_priv(sch); |
| struct atm_flow_data *flow, *tmp; |
| |
| pr_debug("atm_tc_destroy(sch %p,[qdisc %p])\n", sch, p); |
| list_for_each_entry(flow, &p->flows, list) |
| tcf_destroy_chain(&flow->filter_list); |
| |
| list_for_each_entry_safe(flow, tmp, &p->flows, list) { |
| if (flow->ref > 1) |
| pr_err("atm_destroy: %p->ref = %d\n", flow, flow->ref); |
| atm_tc_put(sch, (unsigned long)flow); |
| } |
| tasklet_kill(&p->task); |
| } |
| |
| static int atm_tc_dump_class(struct Qdisc *sch, unsigned long cl, |
| struct sk_buff *skb, struct tcmsg *tcm) |
| { |
| struct atm_qdisc_data *p = qdisc_priv(sch); |
| struct atm_flow_data *flow = (struct atm_flow_data *)cl; |
| struct nlattr *nest; |
| |
| pr_debug("atm_tc_dump_class(sch %p,[qdisc %p],flow %p,skb %p,tcm %p)\n", |
| sch, p, flow, skb, tcm); |
| if (list_empty(&flow->list)) |
| return -EINVAL; |
| tcm->tcm_handle = flow->classid; |
| tcm->tcm_info = flow->q->handle; |
| |
| nest = nla_nest_start(skb, TCA_OPTIONS); |
| if (nest == NULL) |
| goto nla_put_failure; |
| |
| if (nla_put(skb, TCA_ATM_HDR, flow->hdr_len, flow->hdr)) |
| goto nla_put_failure; |
| if (flow->vcc) { |
| struct sockaddr_atmpvc pvc; |
| int state; |
| |
| memset(&pvc, 0, sizeof(pvc)); |
| pvc.sap_family = AF_ATMPVC; |
| pvc.sap_addr.itf = flow->vcc->dev ? flow->vcc->dev->number : -1; |
| pvc.sap_addr.vpi = flow->vcc->vpi; |
| pvc.sap_addr.vci = flow->vcc->vci; |
| if (nla_put(skb, TCA_ATM_ADDR, sizeof(pvc), &pvc)) |
| goto nla_put_failure; |
| state = ATM_VF2VS(flow->vcc->flags); |
| if (nla_put_u32(skb, TCA_ATM_STATE, state)) |
| goto nla_put_failure; |
| } |
| if (flow->excess) { |
| if (nla_put_u32(skb, TCA_ATM_EXCESS, flow->classid)) |
| goto nla_put_failure; |
| } else { |
| if (nla_put_u32(skb, TCA_ATM_EXCESS, 0)) |
| goto nla_put_failure; |
| } |
| return nla_nest_end(skb, nest); |
| |
| nla_put_failure: |
| nla_nest_cancel(skb, nest); |
| return -1; |
| } |
| static int |
| atm_tc_dump_class_stats(struct Qdisc *sch, unsigned long arg, |
| struct gnet_dump *d) |
| { |
| struct atm_flow_data *flow = (struct atm_flow_data *)arg; |
| |
| if (gnet_stats_copy_basic(qdisc_root_sleeping_running(sch), |
| d, NULL, &flow->bstats) < 0 || |
| gnet_stats_copy_queue(d, NULL, &flow->qstats, flow->q->q.qlen) < 0) |
| return -1; |
| |
| return 0; |
| } |
| |
| static int atm_tc_dump(struct Qdisc *sch, struct sk_buff *skb) |
| { |
| return 0; |
| } |
| |
| static const struct Qdisc_class_ops atm_class_ops = { |
| .graft = atm_tc_graft, |
| .leaf = atm_tc_leaf, |
| .get = atm_tc_get, |
| .put = atm_tc_put, |
| .change = atm_tc_change, |
| .delete = atm_tc_delete, |
| .walk = atm_tc_walk, |
| .tcf_chain = atm_tc_find_tcf, |
| .bind_tcf = atm_tc_bind_filter, |
| .unbind_tcf = atm_tc_put, |
| .dump = atm_tc_dump_class, |
| .dump_stats = atm_tc_dump_class_stats, |
| }; |
| |
| static struct Qdisc_ops atm_qdisc_ops __read_mostly = { |
| .cl_ops = &atm_class_ops, |
| .id = "atm", |
| .priv_size = sizeof(struct atm_qdisc_data), |
| .enqueue = atm_tc_enqueue, |
| .dequeue = atm_tc_dequeue, |
| .peek = atm_tc_peek, |
| .init = atm_tc_init, |
| .reset = atm_tc_reset, |
| .destroy = atm_tc_destroy, |
| .dump = atm_tc_dump, |
| .owner = THIS_MODULE, |
| }; |
| |
| static int __init atm_init(void) |
| { |
| return register_qdisc(&atm_qdisc_ops); |
| } |
| |
| static void __exit atm_exit(void) |
| { |
| unregister_qdisc(&atm_qdisc_ops); |
| } |
| |
| module_init(atm_init) |
| module_exit(atm_exit) |
| MODULE_LICENSE("GPL"); |