blob: f09acd0bb01318d9307dd09442e7beffa5d106f9 [file] [log] [blame]
/* -----------------------------------------------------------------------------
* Copyright (c) 2011 Ozmo Inc
* Released under the GNU General Public License Version 2 (GPLv2).
* -----------------------------------------------------------------------------
*/
#include <linux/module.h>
#include <linux/timer.h>
#include <linux/sched.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/errno.h>
#include <linux/ieee80211.h>
#include "ozdbg.h"
#include "ozprotocol.h"
#include "ozeltbuf.h"
#include "ozpd.h"
#include "ozproto.h"
#include "ozusbsvc.h"
#include "ozappif.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
#define OZ_MAX_TIMER_POOL_SIZE 16
struct oz_binding {
struct packet_type ptype;
char name[OZ_MAX_BINDING_LEN];
struct list_head link;
};
/*
* External variable
*/
DEFINE_SPINLOCK(g_polling_lock);
/*
* Static external variables.
*/
static LIST_HEAD(g_pd_list);
static LIST_HEAD(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;
/*
* 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);
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_dbg(ON, "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 = keep_alive * 1000*60*60*24*20;
break;
case OZ_KALIVE_SECS:
pd->keep_alive = keep_alive*1000;
break;
case OZ_KALIVE_MINS:
pd->keep_alive = keep_alive*1000*60;
break;
case OZ_KALIVE_HOURS:
pd->keep_alive = keep_alive*1000*60*60;
break;
default:
pd->keep_alive = 0;
}
oz_dbg(ON, "Keepalive = %lu mSec\n", pd->keep_alive);
}
/*
* Context: softirq-serialized
*/
static void pd_set_presleep(struct oz_pd *pd, u8 presleep, u8 start_timer)
{
if (presleep)
pd->presleep = presleep*100;
else
pd->presleep = OZ_PRESLEEP_TOUT;
if (start_timer) {
spin_unlock(&g_polling_lock);
oz_timer_add(pd, OZ_TIMER_TOUT, pd->presleep);
spin_lock(&g_polling_lock);
}
oz_dbg(ON, "Presleep time = %lu mSec\n", pd->presleep);
}
/*
* 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;
getnstimeofday(&pd->last_rx_timestamp);
spin_lock_bh(&g_polling_lock);
list_for_each(e, &g_pd_list) {
pd2 = container_of(e, struct oz_pd, link);
if (ether_addr_equal(pd2->mac_addr, pd_addr)) {
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_dbg(ON, "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_dbg(ON, "Max frame:%u Ms per isoc:%u\n",
pd->max_tx_size, pd->ms_per_isoc);
pd->max_stream_buffering = 3*1024;
pd->pulse_period = OZ_QUANTUM;
pd_set_presleep(pd, body->presleep, 0);
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_dbg(ON, "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, GFP_ATOMIC);
if (!f)
return;
f->ep_num = ep_num;
f->index = index;
f->len = len;
memcpy(f->report, report, len);
oz_dbg(ON, "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);
struct timespec current_time;
int dup = 0;
u32 pkt_num;
oz_dbg(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_dbg(ON, "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) {
if (!(pd->state & OZ_PD_S_CONNECTED))
oz_pd_set_state(pd, OZ_PD_S_CONNECTED);
getnstimeofday(&current_time);
if ((current_time.tv_sec != pd->last_rx_timestamp.tv_sec) ||
(pd->presleep < MSEC_PER_SEC)) {
oz_timer_add(pd, OZ_TIMER_TOUT, pd->presleep);
pd->last_rx_timestamp = current_time;
}
if (pkt_num != pd->last_rx_pkt_num) {
pd->last_rx_pkt_num = pkt_num;
} else {
dup = 1;
oz_dbg(ON, "Duplicate frame\n");
}
}
if (pd && !dup && ((pd->mode & OZ_MODE_MASK) == OZ_MODE_TRIGGERED)) {
oz_dbg(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_dbg(ON, "RX: OZ_ELT_CONNECT_REQ\n");
pd = oz_connect_req(pd, elt, src_addr, skb->dev);
break;
case OZ_ELT_DISCONNECT:
oz_dbg(ON, "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_dbg(ON, "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, 1);
spin_unlock(&g_polling_lock);
}
}
break;
case OZ_ELT_FAREWELL_REQ: {
struct oz_elt_farewell *body =
(struct oz_elt_farewell *)(elt + 1);
oz_dbg(ON, "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_dbg(ON, "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 oz_binding *b, *t;
/* Walk the list of bindings and remove each one.
*/
spin_lock_bh(&g_binding_lock);
list_for_each_entry_safe(b, t, &g_binding, link) {
list_del(&b->link);
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);
}
spin_unlock_bh(&g_polling_lock);
oz_dbg(ON, "Protocol stopped\n");
}
/*
* Context: softirq
*/
void oz_pd_heartbeat_handler(unsigned long data)
{
struct oz_pd *pd = (struct oz_pd *)data;
u16 apps = 0;
spin_lock_bh(&g_polling_lock);
if (pd->state & OZ_PD_S_CONNECTED)
apps = pd->total_apps;
spin_unlock_bh(&g_polling_lock);
if (apps)
oz_pd_heartbeat(pd, apps);
oz_pd_put(pd);
}
/*
* Context: softirq
*/
void oz_pd_timeout_handler(unsigned long data)
{
int type;
struct oz_pd *pd = (struct oz_pd *)data;
spin_lock_bh(&g_polling_lock);
type = pd->timeout_type;
spin_unlock_bh(&g_polling_lock);
switch (type) {
case OZ_TIMER_TOUT:
oz_pd_sleep(pd);
break;
case OZ_TIMER_STOP:
oz_pd_stop(pd);
break;
}
oz_pd_put(pd);
}
/*
* Context: Interrupt
*/
enum hrtimer_restart oz_pd_heartbeat_event(struct hrtimer *timer)
{
struct oz_pd *pd;
pd = container_of(timer, struct oz_pd, heartbeat);
hrtimer_forward_now(timer, ktime_set(pd->pulse_period /
MSEC_PER_SEC, (pd->pulse_period % MSEC_PER_SEC) * NSEC_PER_MSEC));
oz_pd_get(pd);
tasklet_schedule(&pd->heartbeat_tasklet);
return HRTIMER_RESTART;
}
/*
* Context: Interrupt
*/
enum hrtimer_restart oz_pd_timeout_event(struct hrtimer *timer)
{
struct oz_pd *pd;
pd = container_of(timer, struct oz_pd, timeout);
oz_pd_get(pd);
tasklet_schedule(&pd->timeout_tasklet);
return HRTIMER_NORESTART;
}
/*
* Context: softirq or process
*/
void oz_timer_add(struct oz_pd *pd, int type, unsigned long due_time)
{
spin_lock_bh(&g_polling_lock);
switch (type) {
case OZ_TIMER_TOUT:
case OZ_TIMER_STOP:
if (hrtimer_active(&pd->timeout)) {
hrtimer_set_expires(&pd->timeout, ktime_set(due_time /
MSEC_PER_SEC, (due_time % MSEC_PER_SEC) *
NSEC_PER_MSEC));
hrtimer_start_expires(&pd->timeout, HRTIMER_MODE_REL);
} else {
hrtimer_start(&pd->timeout, ktime_set(due_time /
MSEC_PER_SEC, (due_time % MSEC_PER_SEC) *
NSEC_PER_MSEC), HRTIMER_MODE_REL);
}
pd->timeout_type = type;
break;
case OZ_TIMER_HEARTBEAT:
if (!hrtimer_active(&pd->heartbeat))
hrtimer_start(&pd->heartbeat, ktime_set(due_time /
MSEC_PER_SEC, (due_time % MSEC_PER_SEC) *
NSEC_PER_MSEC), HRTIMER_MODE_REL);
break;
}
spin_unlock_bh(&g_polling_lock);
}
/*
* Context: softirq or process
*/
void oz_pd_request_heartbeat(struct oz_pd *pd)
{
oz_timer_add(pd, OZ_TIMER_HEARTBEAT, pd->pulse_period > 0 ?
pd->pulse_period : OZ_QUANTUM);
}
/*
* 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 (ether_addr_equal(pd->mac_addr, mac_addr)) {
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)
{
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(const char *net_dev)
{
struct oz_binding *binding;
binding = kzalloc(sizeof(struct oz_binding), GFP_KERNEL);
if (!binding)
return;
binding->ptype.type = htons(OZ_ETHERTYPE);
binding->ptype.func = oz_pkt_recv;
if (net_dev && *net_dev) {
memcpy(binding->name, net_dev, OZ_MAX_BINDING_LEN);
oz_dbg(ON, "Adding binding: %s\n", net_dev);
binding->ptype.dev = dev_get_by_name(&init_net, net_dev);
if (binding->ptype.dev == NULL) {
oz_dbg(ON, "Netdev %s not found\n", net_dev);
kfree(binding);
return;
}
}
dev_add_pack(&binding->ptype);
spin_lock_bh(&g_binding_lock);
list_add_tail(&binding->link, &g_binding);
spin_unlock_bh(&g_binding_lock);
}
/*
* 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(const char *net_dev)
{
struct oz_binding *binding;
int found = 0;
oz_dbg(ON, "Removing binding: %s\n", net_dev);
spin_lock_bh(&g_binding_lock);
list_for_each_entry(binding, &g_binding, link) {
if (strncmp(binding->name, net_dev, OZ_MAX_BINDING_LEN) == 0) {
oz_dbg(ON, "Binding '%s' found\n", net_dev);
found = 1;
break;
}
}
spin_unlock_bh(&g_binding_lock);
if (found) {
dev_remove_pack(&binding->ptype);
if (binding->ptype.dev) {
dev_put(binding->ptype.dev);
pd_stop_all_for_device(binding->ptype.dev);
}
list_del(&binding->link);
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);
}
}
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;
}