| /* ----------------------------------------------------------------------------- |
| * Copyright (c) 2011 Ozmo Inc |
| * Released under the GNU General Public License Version 2 (GPLv2). |
| * ----------------------------------------------------------------------------- |
| */ |
| #include <linux/init.h> |
| #include <linux/module.h> |
| #include <linux/timer.h> |
| #include <linux/sched.h> |
| #include <linux/netdevice.h> |
| #include <linux/errno.h> |
| #include <linux/ieee80211.h> |
| #include "ozconfig.h" |
| #include "ozprotocol.h" |
| #include "ozeltbuf.h" |
| #include "ozpd.h" |
| #include "ozproto.h" |
| #include "ozusbsvc.h" |
| #include "oztrace.h" |
| #include "ozappif.h" |
| #include "ozevent.h" |
| #include <asm/unaligned.h> |
| #include <linux/uaccess.h> |
| #include <net/psnap.h> |
| /*------------------------------------------------------------------------------ |
| */ |
| #define OZ_CF_CONN_SUCCESS 1 |
| #define OZ_CF_CONN_FAILURE 2 |
| |
| #define OZ_DO_STOP 1 |
| #define OZ_DO_SLEEP 2 |
| |
| /* States of the timer. |
| */ |
| #define OZ_TIMER_IDLE 0 |
| #define OZ_TIMER_SET 1 |
| #define OZ_TIMER_IN_HANDLER 2 |
| |
| #define OZ_MAX_TIMER_POOL_SIZE 16 |
| |
| /*------------------------------------------------------------------------------ |
| */ |
| struct oz_binding { |
| struct packet_type ptype; |
| char name[OZ_MAX_BINDING_LEN]; |
| struct oz_binding *next; |
| }; |
| |
| struct oz_timer { |
| struct list_head link; |
| struct oz_pd *pd; |
| unsigned long due_time; |
| int type; |
| }; |
| /*------------------------------------------------------------------------------ |
| * Static external variables. |
| */ |
| static DEFINE_SPINLOCK(g_polling_lock); |
| static LIST_HEAD(g_pd_list); |
| static struct oz_binding *g_binding ; |
| static DEFINE_SPINLOCK(g_binding_lock); |
| static struct sk_buff_head g_rx_queue; |
| static u8 g_session_id; |
| static u16 g_apps = 0x1; |
| static int g_processing_rx; |
| static struct timer_list g_timer; |
| static struct oz_timer *g_cur_timer; |
| static struct list_head *g_timer_pool; |
| static int g_timer_pool_count; |
| static int g_timer_state = OZ_TIMER_IDLE; |
| static LIST_HEAD(g_timer_list); |
| /*------------------------------------------------------------------------------ |
| */ |
| static void oz_protocol_timer_start(void); |
| /*------------------------------------------------------------------------------ |
| * Context: softirq-serialized |
| */ |
| static u8 oz_get_new_session_id(u8 exclude) |
| { |
| if (++g_session_id == 0) |
| g_session_id = 1; |
| if (g_session_id == exclude) { |
| if (++g_session_id == 0) |
| g_session_id = 1; |
| } |
| return g_session_id; |
| } |
| /*------------------------------------------------------------------------------ |
| * Context: softirq-serialized |
| */ |
| static void oz_send_conn_rsp(struct oz_pd *pd, u8 status) |
| { |
| struct sk_buff *skb; |
| struct net_device *dev = pd->net_dev; |
| struct oz_hdr *oz_hdr; |
| struct oz_elt *elt; |
| struct oz_elt_connect_rsp *body; |
| int sz = sizeof(struct oz_hdr) + sizeof(struct oz_elt) + |
| sizeof(struct oz_elt_connect_rsp); |
| skb = alloc_skb(sz + OZ_ALLOCATED_SPACE(dev), GFP_ATOMIC); |
| if (skb == NULL) |
| return; |
| skb_reserve(skb, LL_RESERVED_SPACE(dev)); |
| skb_reset_network_header(skb); |
| oz_hdr = (struct oz_hdr *)skb_put(skb, sz); |
| elt = (struct oz_elt *)(oz_hdr+1); |
| body = (struct oz_elt_connect_rsp *)(elt+1); |
| skb->dev = dev; |
| skb->protocol = htons(OZ_ETHERTYPE); |
| /* Fill in device header */ |
| if (dev_hard_header(skb, dev, OZ_ETHERTYPE, pd->mac_addr, |
| dev->dev_addr, skb->len) < 0) { |
| kfree_skb(skb); |
| return; |
| } |
| oz_hdr->control = (OZ_PROTOCOL_VERSION<<OZ_VERSION_SHIFT); |
| oz_hdr->last_pkt_num = 0; |
| put_unaligned(0, &oz_hdr->pkt_num); |
| oz_event_log(OZ_EVT_CONNECT_RSP, 0, 0, NULL, 0); |
| elt->type = OZ_ELT_CONNECT_RSP; |
| elt->length = sizeof(struct oz_elt_connect_rsp); |
| memset(body, 0, sizeof(struct oz_elt_connect_rsp)); |
| body->status = status; |
| if (status == 0) { |
| body->mode = pd->mode; |
| body->session_id = pd->session_id; |
| put_unaligned(cpu_to_le16(pd->total_apps), &body->apps); |
| } |
| oz_trace("TX: OZ_ELT_CONNECT_RSP %d", status); |
| dev_queue_xmit(skb); |
| return; |
| } |
| /*------------------------------------------------------------------------------ |
| * Context: softirq-serialized |
| */ |
| static void pd_set_keepalive(struct oz_pd *pd, u8 kalive) |
| { |
| unsigned long keep_alive = kalive & OZ_KALIVE_VALUE_MASK; |
| |
| switch (kalive & OZ_KALIVE_TYPE_MASK) { |
| case OZ_KALIVE_SPECIAL: |
| pd->keep_alive_j = |
| oz_ms_to_jiffies(keep_alive * 1000*60*60*24*20); |
| break; |
| case OZ_KALIVE_SECS: |
| pd->keep_alive_j = oz_ms_to_jiffies(keep_alive*1000); |
| break; |
| case OZ_KALIVE_MINS: |
| pd->keep_alive_j = oz_ms_to_jiffies(keep_alive*1000*60); |
| break; |
| case OZ_KALIVE_HOURS: |
| pd->keep_alive_j = oz_ms_to_jiffies(keep_alive*1000*60*60); |
| break; |
| default: |
| pd->keep_alive_j = 0; |
| } |
| oz_trace("Keepalive = %lu jiffies\n", pd->keep_alive_j); |
| } |
| /*------------------------------------------------------------------------------ |
| * Context: softirq-serialized |
| */ |
| static void pd_set_presleep(struct oz_pd *pd, u8 presleep) |
| { |
| if (presleep) |
| pd->presleep_j = oz_ms_to_jiffies(presleep*100); |
| else |
| pd->presleep_j = OZ_PRESLEEP_TOUT_J; |
| oz_trace("Presleep time = %lu jiffies\n", pd->presleep_j); |
| } |
| /*------------------------------------------------------------------------------ |
| * Context: softirq-serialized |
| */ |
| static struct oz_pd *oz_connect_req(struct oz_pd *cur_pd, struct oz_elt *elt, |
| const u8 *pd_addr, struct net_device *net_dev) |
| { |
| struct oz_pd *pd; |
| struct oz_elt_connect_req *body = |
| (struct oz_elt_connect_req *)(elt+1); |
| u8 rsp_status = OZ_STATUS_SUCCESS; |
| u8 stop_needed = 0; |
| u16 new_apps = g_apps; |
| struct net_device *old_net_dev = NULL; |
| struct oz_pd *free_pd = NULL; |
| if (cur_pd) { |
| pd = cur_pd; |
| spin_lock_bh(&g_polling_lock); |
| } else { |
| struct oz_pd *pd2 = NULL; |
| struct list_head *e; |
| pd = oz_pd_alloc(pd_addr); |
| if (pd == NULL) |
| return NULL; |
| pd->last_rx_time_j = jiffies; |
| spin_lock_bh(&g_polling_lock); |
| list_for_each(e, &g_pd_list) { |
| pd2 = container_of(e, struct oz_pd, link); |
| if (memcmp(pd2->mac_addr, pd_addr, ETH_ALEN) == 0) { |
| free_pd = pd; |
| pd = pd2; |
| break; |
| } |
| } |
| if (pd != pd2) |
| list_add_tail(&pd->link, &g_pd_list); |
| } |
| if (pd == NULL) { |
| spin_unlock_bh(&g_polling_lock); |
| return NULL; |
| } |
| if (pd->net_dev != net_dev) { |
| old_net_dev = pd->net_dev; |
| dev_hold(net_dev); |
| pd->net_dev = net_dev; |
| } |
| oz_trace("Host vendor: %d\n", body->host_vendor); |
| pd->max_tx_size = OZ_MAX_TX_SIZE; |
| pd->mode = body->mode; |
| pd->pd_info = body->pd_info; |
| if (pd->mode & OZ_F_ISOC_NO_ELTS) { |
| pd->ms_per_isoc = body->ms_per_isoc; |
| if (!pd->ms_per_isoc) |
| pd->ms_per_isoc = 4; |
| |
| switch (body->ms_isoc_latency & OZ_LATENCY_MASK) { |
| case OZ_ONE_MS_LATENCY: |
| pd->isoc_latency = (body->ms_isoc_latency & |
| ~OZ_LATENCY_MASK) / pd->ms_per_isoc; |
| break; |
| case OZ_TEN_MS_LATENCY: |
| pd->isoc_latency = ((body->ms_isoc_latency & |
| ~OZ_LATENCY_MASK) * 10) / pd->ms_per_isoc; |
| break; |
| default: |
| pd->isoc_latency = OZ_MAX_TX_QUEUE_ISOC; |
| } |
| } |
| if (body->max_len_div16) |
| pd->max_tx_size = ((u16)body->max_len_div16)<<4; |
| oz_trace("Max frame:%u Ms per isoc:%u\n", |
| pd->max_tx_size, pd->ms_per_isoc); |
| pd->max_stream_buffering = 3*1024; |
| pd->timeout_time_j = jiffies + OZ_CONNECTION_TOUT_J; |
| pd->pulse_period_j = OZ_QUANTUM_J; |
| pd_set_presleep(pd, body->presleep); |
| pd_set_keepalive(pd, body->keep_alive); |
| |
| new_apps &= le16_to_cpu(get_unaligned(&body->apps)); |
| if ((new_apps & 0x1) && (body->session_id)) { |
| if (pd->session_id) { |
| if (pd->session_id != body->session_id) { |
| rsp_status = OZ_STATUS_SESSION_MISMATCH; |
| goto done; |
| } |
| } else { |
| new_apps &= ~0x1; /* Resume not permitted */ |
| pd->session_id = |
| oz_get_new_session_id(body->session_id); |
| } |
| } else { |
| if (pd->session_id && !body->session_id) { |
| rsp_status = OZ_STATUS_SESSION_TEARDOWN; |
| stop_needed = 1; |
| } else { |
| new_apps &= ~0x1; /* Resume not permitted */ |
| pd->session_id = |
| oz_get_new_session_id(body->session_id); |
| } |
| } |
| done: |
| if (rsp_status == OZ_STATUS_SUCCESS) { |
| u16 start_apps = new_apps & ~pd->total_apps & ~0x1; |
| u16 stop_apps = pd->total_apps & ~new_apps & ~0x1; |
| u16 resume_apps = new_apps & pd->paused_apps & ~0x1; |
| spin_unlock_bh(&g_polling_lock); |
| oz_pd_set_state(pd, OZ_PD_S_CONNECTED); |
| oz_timer_delete(pd, OZ_TIMER_STOP); |
| oz_trace("new_apps=0x%x total_apps=0x%x paused_apps=0x%x\n", |
| new_apps, pd->total_apps, pd->paused_apps); |
| if (start_apps) { |
| if (oz_services_start(pd, start_apps, 0)) |
| rsp_status = OZ_STATUS_TOO_MANY_PDS; |
| } |
| if (resume_apps) |
| if (oz_services_start(pd, resume_apps, 1)) |
| rsp_status = OZ_STATUS_TOO_MANY_PDS; |
| if (stop_apps) |
| oz_services_stop(pd, stop_apps, 0); |
| oz_pd_request_heartbeat(pd); |
| } else { |
| spin_unlock_bh(&g_polling_lock); |
| } |
| oz_send_conn_rsp(pd, rsp_status); |
| if (rsp_status != OZ_STATUS_SUCCESS) { |
| if (stop_needed) |
| oz_pd_stop(pd); |
| oz_pd_put(pd); |
| pd = NULL; |
| } |
| if (old_net_dev) |
| dev_put(old_net_dev); |
| if (free_pd) |
| oz_pd_destroy(free_pd); |
| return pd; |
| } |
| /*------------------------------------------------------------------------------ |
| * Context: softirq-serialized |
| */ |
| static void oz_add_farewell(struct oz_pd *pd, u8 ep_num, u8 index, |
| const u8 *report, u8 len) |
| { |
| struct oz_farewell *f; |
| struct oz_farewell *f2; |
| int found = 0; |
| f = kmalloc(sizeof(struct oz_farewell) + len - 1, GFP_ATOMIC); |
| if (!f) |
| return; |
| f->ep_num = ep_num; |
| f->index = index; |
| memcpy(f->report, report, len); |
| oz_trace("RX: Adding farewell report\n"); |
| spin_lock(&g_polling_lock); |
| list_for_each_entry(f2, &pd->farewell_list, link) { |
| if ((f2->ep_num == ep_num) && (f2->index == index)) { |
| found = 1; |
| list_del(&f2->link); |
| break; |
| } |
| } |
| list_add_tail(&f->link, &pd->farewell_list); |
| spin_unlock(&g_polling_lock); |
| if (found) |
| kfree(f2); |
| } |
| /*------------------------------------------------------------------------------ |
| * Context: softirq-serialized |
| */ |
| static void oz_rx_frame(struct sk_buff *skb) |
| { |
| u8 *mac_hdr; |
| u8 *src_addr; |
| struct oz_elt *elt; |
| int length; |
| struct oz_pd *pd = NULL; |
| struct oz_hdr *oz_hdr = (struct oz_hdr *)skb_network_header(skb); |
| int dup = 0; |
| u32 pkt_num; |
| |
| oz_event_log(OZ_EVT_RX_PROCESS, 0, |
| (((u16)oz_hdr->control)<<8)|oz_hdr->last_pkt_num, |
| NULL, oz_hdr->pkt_num); |
| oz_trace2(OZ_TRACE_RX_FRAMES, |
| "RX frame PN=0x%x LPN=0x%x control=0x%x\n", |
| oz_hdr->pkt_num, oz_hdr->last_pkt_num, oz_hdr->control); |
| mac_hdr = skb_mac_header(skb); |
| src_addr = &mac_hdr[ETH_ALEN] ; |
| length = skb->len; |
| |
| /* Check the version field */ |
| if (oz_get_prot_ver(oz_hdr->control) != OZ_PROTOCOL_VERSION) { |
| oz_trace("Incorrect protocol version: %d\n", |
| oz_get_prot_ver(oz_hdr->control)); |
| goto done; |
| } |
| |
| pkt_num = le32_to_cpu(get_unaligned(&oz_hdr->pkt_num)); |
| |
| pd = oz_pd_find(src_addr); |
| if (pd) { |
| pd->last_rx_time_j = jiffies; |
| oz_timer_add(pd, OZ_TIMER_TOUT, |
| pd->last_rx_time_j + pd->presleep_j, 1); |
| if (pkt_num != pd->last_rx_pkt_num) { |
| pd->last_rx_pkt_num = pkt_num; |
| } else { |
| dup = 1; |
| oz_trace("Duplicate frame\n"); |
| } |
| } |
| |
| if (pd && !dup && ((pd->mode & OZ_MODE_MASK) == OZ_MODE_TRIGGERED)) { |
| oz_trace2(OZ_TRACE_RX_FRAMES, "Received TRIGGER Frame\n"); |
| pd->last_sent_frame = &pd->tx_queue; |
| if (oz_hdr->control & OZ_F_ACK) { |
| /* Retire completed frames */ |
| oz_retire_tx_frames(pd, oz_hdr->last_pkt_num); |
| } |
| if ((oz_hdr->control & OZ_F_ACK_REQUESTED) && |
| (pd->state == OZ_PD_S_CONNECTED)) { |
| int backlog = pd->nb_queued_frames; |
| pd->trigger_pkt_num = pkt_num; |
| /* Send queued frames */ |
| oz_send_queued_frames(pd, backlog); |
| } |
| } |
| |
| length -= sizeof(struct oz_hdr); |
| elt = (struct oz_elt *)((u8 *)oz_hdr + sizeof(struct oz_hdr)); |
| |
| while (length >= sizeof(struct oz_elt)) { |
| length -= sizeof(struct oz_elt) + elt->length; |
| if (length < 0) |
| break; |
| switch (elt->type) { |
| case OZ_ELT_CONNECT_REQ: |
| oz_event_log(OZ_EVT_CONNECT_REQ, 0, 0, NULL, 0); |
| oz_trace("RX: OZ_ELT_CONNECT_REQ\n"); |
| pd = oz_connect_req(pd, elt, src_addr, skb->dev); |
| break; |
| case OZ_ELT_DISCONNECT: |
| oz_trace("RX: OZ_ELT_DISCONNECT\n"); |
| if (pd) |
| oz_pd_sleep(pd); |
| break; |
| case OZ_ELT_UPDATE_PARAM_REQ: { |
| struct oz_elt_update_param *body = |
| (struct oz_elt_update_param *)(elt + 1); |
| oz_trace("RX: OZ_ELT_UPDATE_PARAM_REQ\n"); |
| if (pd && (pd->state & OZ_PD_S_CONNECTED)) { |
| spin_lock(&g_polling_lock); |
| pd_set_keepalive(pd, body->keepalive); |
| pd_set_presleep(pd, body->presleep); |
| spin_unlock(&g_polling_lock); |
| } |
| } |
| break; |
| case OZ_ELT_FAREWELL_REQ: { |
| struct oz_elt_farewell *body = |
| (struct oz_elt_farewell *)(elt + 1); |
| oz_trace("RX: OZ_ELT_FAREWELL_REQ\n"); |
| oz_add_farewell(pd, body->ep_num, |
| body->index, body->report, |
| elt->length + 1 - sizeof(*body)); |
| } |
| break; |
| case OZ_ELT_APP_DATA: |
| if (pd && (pd->state & OZ_PD_S_CONNECTED)) { |
| struct oz_app_hdr *app_hdr = |
| (struct oz_app_hdr *)(elt+1); |
| if (dup) |
| break; |
| oz_handle_app_elt(pd, app_hdr->app_id, elt); |
| } |
| break; |
| default: |
| oz_trace("RX: Unknown elt %02x\n", elt->type); |
| } |
| elt = oz_next_elt(elt); |
| } |
| done: |
| if (pd) |
| oz_pd_put(pd); |
| consume_skb(skb); |
| } |
| /*------------------------------------------------------------------------------ |
| * Context: process |
| */ |
| void oz_protocol_term(void) |
| { |
| struct list_head *chain; |
| del_timer_sync(&g_timer); |
| /* Walk the list of bindings and remove each one. |
| */ |
| spin_lock_bh(&g_binding_lock); |
| while (g_binding) { |
| struct oz_binding *b = g_binding; |
| g_binding = b->next; |
| spin_unlock_bh(&g_binding_lock); |
| dev_remove_pack(&b->ptype); |
| if (b->ptype.dev) |
| dev_put(b->ptype.dev); |
| kfree(b); |
| spin_lock_bh(&g_binding_lock); |
| } |
| spin_unlock_bh(&g_binding_lock); |
| /* Walk the list of PDs and stop each one. This causes the PD to be |
| * removed from the list so we can just pull each one from the head |
| * of the list. |
| */ |
| spin_lock_bh(&g_polling_lock); |
| while (!list_empty(&g_pd_list)) { |
| struct oz_pd *pd = |
| list_first_entry(&g_pd_list, struct oz_pd, link); |
| oz_pd_get(pd); |
| spin_unlock_bh(&g_polling_lock); |
| oz_pd_stop(pd); |
| oz_pd_put(pd); |
| spin_lock_bh(&g_polling_lock); |
| } |
| chain = g_timer_pool; |
| g_timer_pool = NULL; |
| spin_unlock_bh(&g_polling_lock); |
| while (chain) { |
| struct oz_timer *t = container_of(chain, struct oz_timer, link); |
| chain = chain->next; |
| kfree(t); |
| } |
| oz_trace("Protocol stopped\n"); |
| } |
| /*------------------------------------------------------------------------------ |
| * Context: softirq |
| */ |
| static void oz_pd_handle_timer(struct oz_pd *pd, int type) |
| { |
| switch (type) { |
| case OZ_TIMER_TOUT: |
| oz_pd_sleep(pd); |
| break; |
| case OZ_TIMER_STOP: |
| oz_pd_stop(pd); |
| break; |
| case OZ_TIMER_HEARTBEAT: { |
| u16 apps = 0; |
| spin_lock_bh(&g_polling_lock); |
| pd->heartbeat_requested = 0; |
| if (pd->state & OZ_PD_S_CONNECTED) |
| apps = pd->total_apps; |
| spin_unlock_bh(&g_polling_lock); |
| if (apps) |
| oz_pd_heartbeat(pd, apps); |
| } |
| break; |
| } |
| } |
| /*------------------------------------------------------------------------------ |
| * Context: softirq |
| */ |
| static void oz_protocol_timer(unsigned long arg) |
| { |
| struct oz_timer *t; |
| struct oz_timer *t2; |
| struct oz_pd *pd; |
| spin_lock_bh(&g_polling_lock); |
| if (!g_cur_timer) { |
| /* This happens if we remove the current timer but can't stop |
| * the timer from firing. In this case just get out. |
| */ |
| oz_event_log(OZ_EVT_TIMER, 0, 0, NULL, 0); |
| spin_unlock_bh(&g_polling_lock); |
| return; |
| } |
| g_timer_state = OZ_TIMER_IN_HANDLER; |
| t = g_cur_timer; |
| g_cur_timer = NULL; |
| list_del(&t->link); |
| spin_unlock_bh(&g_polling_lock); |
| do { |
| pd = t->pd; |
| oz_event_log(OZ_EVT_TIMER, 0, t->type, NULL, 0); |
| oz_pd_handle_timer(pd, t->type); |
| spin_lock_bh(&g_polling_lock); |
| if (g_timer_pool_count < OZ_MAX_TIMER_POOL_SIZE) { |
| t->link.next = g_timer_pool; |
| g_timer_pool = &t->link; |
| g_timer_pool_count++; |
| t = NULL; |
| } |
| if (!list_empty(&g_timer_list)) { |
| t2 = container_of(g_timer_list.next, |
| struct oz_timer, link); |
| if (time_before_eq(t2->due_time, jiffies)) |
| list_del(&t2->link); |
| else |
| t2 = NULL; |
| } else { |
| t2 = NULL; |
| } |
| spin_unlock_bh(&g_polling_lock); |
| oz_pd_put(pd); |
| kfree(t); |
| t = t2; |
| } while (t); |
| g_timer_state = OZ_TIMER_IDLE; |
| oz_protocol_timer_start(); |
| } |
| /*------------------------------------------------------------------------------ |
| * Context: softirq |
| */ |
| static void oz_protocol_timer_start(void) |
| { |
| spin_lock_bh(&g_polling_lock); |
| if (!list_empty(&g_timer_list)) { |
| g_cur_timer = |
| container_of(g_timer_list.next, struct oz_timer, link); |
| if (g_timer_state == OZ_TIMER_SET) { |
| oz_event_log(OZ_EVT_TIMER_CTRL, 3, |
| (u16)g_cur_timer->type, NULL, |
| (unsigned)g_cur_timer->due_time); |
| mod_timer(&g_timer, g_cur_timer->due_time); |
| } else { |
| oz_event_log(OZ_EVT_TIMER_CTRL, 4, |
| (u16)g_cur_timer->type, NULL, |
| (unsigned)g_cur_timer->due_time); |
| g_timer.expires = g_cur_timer->due_time; |
| g_timer.function = oz_protocol_timer; |
| g_timer.data = 0; |
| add_timer(&g_timer); |
| } |
| g_timer_state = OZ_TIMER_SET; |
| } else { |
| oz_trace("No queued timers\n"); |
| } |
| spin_unlock_bh(&g_polling_lock); |
| } |
| /*------------------------------------------------------------------------------ |
| * Context: softirq or process |
| */ |
| void oz_timer_add(struct oz_pd *pd, int type, unsigned long due_time, |
| int remove) |
| { |
| struct list_head *e; |
| struct oz_timer *t = NULL; |
| int restart_needed = 0; |
| oz_event_log(OZ_EVT_TIMER_CTRL, 1, (u16)type, NULL, (unsigned)due_time); |
| spin_lock(&g_polling_lock); |
| if (remove) { |
| list_for_each(e, &g_timer_list) { |
| t = container_of(e, struct oz_timer, link); |
| if ((t->pd == pd) && (t->type == type)) { |
| if (g_cur_timer == t) { |
| restart_needed = 1; |
| g_cur_timer = NULL; |
| } |
| list_del(e); |
| break; |
| } |
| t = NULL; |
| } |
| } |
| if (!t) { |
| if (g_timer_pool) { |
| t = container_of(g_timer_pool, struct oz_timer, link); |
| g_timer_pool = g_timer_pool->next; |
| g_timer_pool_count--; |
| } else { |
| t = kmalloc(sizeof(struct oz_timer), GFP_ATOMIC); |
| } |
| if (t) { |
| t->pd = pd; |
| t->type = type; |
| oz_pd_get(pd); |
| } |
| } |
| if (t) { |
| struct oz_timer *t2; |
| t->due_time = due_time; |
| list_for_each(e, &g_timer_list) { |
| t2 = container_of(e, struct oz_timer, link); |
| if (time_before(due_time, t2->due_time)) { |
| if (t2 == g_cur_timer) { |
| g_cur_timer = NULL; |
| restart_needed = 1; |
| } |
| break; |
| } |
| } |
| list_add_tail(&t->link, e); |
| } |
| if (g_timer_state == OZ_TIMER_IDLE) |
| restart_needed = 1; |
| else if (g_timer_state == OZ_TIMER_IN_HANDLER) |
| restart_needed = 0; |
| spin_unlock(&g_polling_lock); |
| if (restart_needed) |
| oz_protocol_timer_start(); |
| } |
| /*------------------------------------------------------------------------------ |
| * Context: softirq or process |
| */ |
| void oz_timer_delete(struct oz_pd *pd, int type) |
| { |
| struct list_head *chain = NULL; |
| struct oz_timer *t; |
| struct oz_timer *n; |
| int restart_needed = 0; |
| int release = 0; |
| oz_event_log(OZ_EVT_TIMER_CTRL, 2, (u16)type, NULL, 0); |
| spin_lock(&g_polling_lock); |
| list_for_each_entry_safe(t, n, &g_timer_list, link) { |
| if ((t->pd == pd) && ((type == 0) || (t->type == type))) { |
| if (g_cur_timer == t) { |
| restart_needed = 1; |
| g_cur_timer = NULL; |
| del_timer(&g_timer); |
| } |
| list_del(&t->link); |
| release++; |
| if (g_timer_pool_count < OZ_MAX_TIMER_POOL_SIZE) { |
| t->link.next = g_timer_pool; |
| g_timer_pool = &t->link; |
| g_timer_pool_count++; |
| } else { |
| t->link.next = chain; |
| chain = &t->link; |
| } |
| if (type) |
| break; |
| } |
| } |
| if (g_timer_state == OZ_TIMER_IN_HANDLER) |
| restart_needed = 0; |
| else if (restart_needed) |
| g_timer_state = OZ_TIMER_IDLE; |
| spin_unlock(&g_polling_lock); |
| if (restart_needed) |
| oz_protocol_timer_start(); |
| while (release--) |
| oz_pd_put(pd); |
| while (chain) { |
| t = container_of(chain, struct oz_timer, link); |
| chain = chain->next; |
| kfree(t); |
| } |
| } |
| /*------------------------------------------------------------------------------ |
| * Context: softirq or process |
| */ |
| void oz_pd_request_heartbeat(struct oz_pd *pd) |
| { |
| unsigned long now = jiffies; |
| unsigned long t; |
| spin_lock(&g_polling_lock); |
| if (pd->heartbeat_requested) { |
| spin_unlock(&g_polling_lock); |
| return; |
| } |
| if (pd->pulse_period_j) |
| t = ((now / pd->pulse_period_j) + 1) * pd->pulse_period_j; |
| else |
| t = now + 1; |
| pd->heartbeat_requested = 1; |
| spin_unlock(&g_polling_lock); |
| oz_timer_add(pd, OZ_TIMER_HEARTBEAT, t, 0); |
| } |
| /*------------------------------------------------------------------------------ |
| * Context: softirq or process |
| */ |
| struct oz_pd *oz_pd_find(const u8 *mac_addr) |
| { |
| struct oz_pd *pd; |
| struct list_head *e; |
| spin_lock_bh(&g_polling_lock); |
| list_for_each(e, &g_pd_list) { |
| pd = container_of(e, struct oz_pd, link); |
| if (memcmp(pd->mac_addr, mac_addr, ETH_ALEN) == 0) { |
| atomic_inc(&pd->ref_count); |
| spin_unlock_bh(&g_polling_lock); |
| return pd; |
| } |
| } |
| spin_unlock_bh(&g_polling_lock); |
| return NULL; |
| } |
| /*------------------------------------------------------------------------------ |
| * Context: process |
| */ |
| void oz_app_enable(int app_id, int enable) |
| { |
| if (app_id <= OZ_APPID_MAX) { |
| spin_lock_bh(&g_polling_lock); |
| if (enable) |
| g_apps |= (1<<app_id); |
| else |
| g_apps &= ~(1<<app_id); |
| spin_unlock_bh(&g_polling_lock); |
| } |
| } |
| /*------------------------------------------------------------------------------ |
| * Context: softirq |
| */ |
| static int oz_pkt_recv(struct sk_buff *skb, struct net_device *dev, |
| struct packet_type *pt, struct net_device *orig_dev) |
| { |
| oz_event_log(OZ_EVT_RX_FRAME, 0, 0, NULL, 0); |
| skb = skb_share_check(skb, GFP_ATOMIC); |
| if (skb == NULL) |
| return 0; |
| spin_lock_bh(&g_rx_queue.lock); |
| if (g_processing_rx) { |
| /* We already hold the lock so use __ variant. |
| */ |
| __skb_queue_head(&g_rx_queue, skb); |
| spin_unlock_bh(&g_rx_queue.lock); |
| } else { |
| g_processing_rx = 1; |
| do { |
| |
| spin_unlock_bh(&g_rx_queue.lock); |
| oz_rx_frame(skb); |
| spin_lock_bh(&g_rx_queue.lock); |
| if (skb_queue_empty(&g_rx_queue)) { |
| g_processing_rx = 0; |
| spin_unlock_bh(&g_rx_queue.lock); |
| break; |
| } |
| /* We already hold the lock so use __ variant. |
| */ |
| skb = __skb_dequeue(&g_rx_queue); |
| } while (1); |
| } |
| return 0; |
| } |
| /*------------------------------------------------------------------------------ |
| * Context: process |
| */ |
| void oz_binding_add(char *net_dev) |
| { |
| struct oz_binding *binding; |
| |
| binding = kmalloc(sizeof(struct oz_binding), GFP_KERNEL); |
| if (binding) { |
| binding->ptype.type = __constant_htons(OZ_ETHERTYPE); |
| binding->ptype.func = oz_pkt_recv; |
| memcpy(binding->name, net_dev, OZ_MAX_BINDING_LEN); |
| if (net_dev && *net_dev) { |
| oz_trace("Adding binding: %s\n", net_dev); |
| binding->ptype.dev = |
| dev_get_by_name(&init_net, net_dev); |
| if (binding->ptype.dev == NULL) { |
| oz_trace("Netdev %s not found\n", net_dev); |
| kfree(binding); |
| binding = NULL; |
| } |
| } else { |
| oz_trace("Binding to all netcards\n"); |
| binding->ptype.dev = NULL; |
| } |
| if (binding) { |
| dev_add_pack(&binding->ptype); |
| spin_lock_bh(&g_binding_lock); |
| binding->next = g_binding; |
| g_binding = binding; |
| spin_unlock_bh(&g_binding_lock); |
| } |
| } |
| } |
| /*------------------------------------------------------------------------------ |
| * Context: process |
| */ |
| static int compare_binding_name(char *s1, char *s2) |
| { |
| int i; |
| for (i = 0; i < OZ_MAX_BINDING_LEN; i++) { |
| if (*s1 != *s2) |
| return 0; |
| if (!*s1++) |
| return 1; |
| s2++; |
| } |
| return 1; |
| } |
| /*------------------------------------------------------------------------------ |
| * Context: process |
| */ |
| static void pd_stop_all_for_device(struct net_device *net_dev) |
| { |
| struct list_head h; |
| struct oz_pd *pd; |
| struct oz_pd *n; |
| INIT_LIST_HEAD(&h); |
| spin_lock_bh(&g_polling_lock); |
| list_for_each_entry_safe(pd, n, &g_pd_list, link) { |
| if (pd->net_dev == net_dev) { |
| list_move(&pd->link, &h); |
| oz_pd_get(pd); |
| } |
| } |
| spin_unlock_bh(&g_polling_lock); |
| while (!list_empty(&h)) { |
| pd = list_first_entry(&h, struct oz_pd, link); |
| oz_pd_stop(pd); |
| oz_pd_put(pd); |
| } |
| } |
| /*------------------------------------------------------------------------------ |
| * Context: process |
| */ |
| void oz_binding_remove(char *net_dev) |
| { |
| struct oz_binding *binding; |
| struct oz_binding **link; |
| oz_trace("Removing binding: %s\n", net_dev); |
| spin_lock_bh(&g_binding_lock); |
| binding = g_binding; |
| link = &g_binding; |
| while (binding) { |
| if (compare_binding_name(binding->name, net_dev)) { |
| oz_trace("Binding '%s' found\n", net_dev); |
| *link = binding->next; |
| break; |
| } else { |
| link = &binding; |
| binding = binding->next; |
| } |
| } |
| spin_unlock_bh(&g_binding_lock); |
| if (binding) { |
| dev_remove_pack(&binding->ptype); |
| if (binding->ptype.dev) { |
| dev_put(binding->ptype.dev); |
| pd_stop_all_for_device(binding->ptype.dev); |
| } |
| kfree(binding); |
| } |
| } |
| /*------------------------------------------------------------------------------ |
| * Context: process |
| */ |
| static char *oz_get_next_device_name(char *s, char *dname, int max_size) |
| { |
| while (*s == ',') |
| s++; |
| while (*s && (*s != ',') && max_size > 1) { |
| *dname++ = *s++; |
| max_size--; |
| } |
| *dname = 0; |
| return s; |
| } |
| /*------------------------------------------------------------------------------ |
| * Context: process |
| */ |
| int oz_protocol_init(char *devs) |
| { |
| skb_queue_head_init(&g_rx_queue); |
| if (devs && (devs[0] == '*')) { |
| oz_binding_add(NULL); |
| } else { |
| char d[32]; |
| while (*devs) { |
| devs = oz_get_next_device_name(devs, d, sizeof(d)); |
| if (d[0]) |
| oz_binding_add(d); |
| } |
| } |
| init_timer(&g_timer); |
| return 0; |
| } |
| /*------------------------------------------------------------------------------ |
| * Context: process |
| */ |
| int oz_get_pd_list(struct oz_mac_addr *addr, int max_count) |
| { |
| struct oz_pd *pd; |
| struct list_head *e; |
| int count = 0; |
| spin_lock_bh(&g_polling_lock); |
| list_for_each(e, &g_pd_list) { |
| if (count >= max_count) |
| break; |
| pd = container_of(e, struct oz_pd, link); |
| memcpy(&addr[count++], pd->mac_addr, ETH_ALEN); |
| } |
| spin_unlock_bh(&g_polling_lock); |
| return count; |
| } |
| /*------------------------------------------------------------------------------ |
| */ |
| void oz_polling_lock_bh(void) |
| { |
| spin_lock_bh(&g_polling_lock); |
| } |
| /*------------------------------------------------------------------------------ |
| */ |
| void oz_polling_unlock_bh(void) |
| { |
| spin_unlock_bh(&g_polling_lock); |
| } |
