nexmon – Rev 1
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/*
* Copyright (c) 2012 Broadcom Corporation
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <linux/netdevice.h>
#include "brcmu_wifi.h"
#include "brcmu_utils.h"
#include "cfg80211.h"
#include "core.h"
#include "debug.h"
#include "tracepoint.h"
#include "fwsignal.h"
#include "fweh.h"
#include "fwil.h"
/**
* struct brcmf_fweh_queue_item - event item on event queue.
*
* @q: list element for queuing.
* @code: event code.
* @ifidx: interface index related to this event.
* @ifaddr: ethernet address for interface.
* @emsg: common parameters of the firmware event message.
* @data: event specific data part of the firmware event.
*/
struct brcmf_fweh_queue_item {
struct list_head q;
enum brcmf_fweh_event_code code;
u8 ifidx;
u8 ifaddr[ETH_ALEN];
struct brcmf_event_msg_be emsg;
u32 datalen;
u8 data[0];
};
/**
* struct brcmf_fweh_event_name - code, name mapping entry.
*/
struct brcmf_fweh_event_name {
enum brcmf_fweh_event_code code;
const char *name;
};
#ifdef DEBUG
#define BRCMF_ENUM_DEF(id, val) \
{ val, #id },
/* array for mapping code to event name */
static struct brcmf_fweh_event_name fweh_event_names[] = {
BRCMF_FWEH_EVENT_ENUM_DEFLIST
};
#undef BRCMF_ENUM_DEF
/**
* brcmf_fweh_event_name() - returns name for given event code.
*
* @code: code to lookup.
*/
static const char *brcmf_fweh_event_name(enum brcmf_fweh_event_code code)
{
int i;
for (i = 0; i < ARRAY_SIZE(fweh_event_names); i++) {
if (fweh_event_names[i].code == code)
return fweh_event_names[i].name;
}
return "unknown";
}
#else
static const char *brcmf_fweh_event_name(enum brcmf_fweh_event_code code)
{
return "nodebug";
}
#endif
/**
* brcmf_fweh_queue_event() - create and queue event.
*
* @fweh: firmware event handling info.
* @event: event queue entry.
*/
static void brcmf_fweh_queue_event(struct brcmf_fweh_info *fweh,
struct brcmf_fweh_queue_item *event)
{
ulong flags;
spin_lock_irqsave(&fweh->evt_q_lock, flags);
list_add_tail(&event->q, &fweh->event_q);
spin_unlock_irqrestore(&fweh->evt_q_lock, flags);
schedule_work(&fweh->event_work);
}
static int brcmf_fweh_call_event_handler(struct brcmf_if *ifp,
enum brcmf_fweh_event_code code,
struct brcmf_event_msg *emsg,
void *data)
{
struct brcmf_fweh_info *fweh;
int err = -EINVAL;
if (ifp) {
fweh = &ifp->drvr->fweh;
/* handle the event if valid interface and handler */
if (fweh->evt_handler[code])
err = fweh->evt_handler[code](ifp, emsg, data);
else
brcmf_err("unhandled event %d ignored\n", code);
} else {
brcmf_err("no interface object\n");
}
return err;
}
/**
* brcmf_fweh_handle_if_event() - handle IF event.
*
* @drvr: driver information object.
* @item: queue entry.
* @ifpp: interface object (may change upon ADD action).
*/
static void brcmf_fweh_handle_if_event(struct brcmf_pub *drvr,
struct brcmf_event_msg *emsg,
void *data)
{
struct brcmf_if_event *ifevent = data;
struct brcmf_if *ifp;
bool is_p2pdev;
int err = 0;
brcmf_dbg(EVENT, "action: %u ifidx: %u bsscfgidx: %u flags: %u role: %u\n",
ifevent->action, ifevent->ifidx, ifevent->bsscfgidx,
ifevent->flags, ifevent->role);
/* The P2P Device interface event must not be ignored contrary to what
* firmware tells us. Older firmware uses p2p noif, with sta role.
* This should be accepted when p2pdev_setup is ongoing. TDLS setup will
* use the same ifevent and should be ignored.
*/
is_p2pdev = ((ifevent->flags & BRCMF_E_IF_FLAG_NOIF) &&
(ifevent->role == BRCMF_E_IF_ROLE_P2P_CLIENT ||
((ifevent->role == BRCMF_E_IF_ROLE_STA) &&
(drvr->fweh.p2pdev_setup_ongoing))));
if (!is_p2pdev && (ifevent->flags & BRCMF_E_IF_FLAG_NOIF)) {
brcmf_dbg(EVENT, "event can be ignored\n");
return;
}
if (ifevent->ifidx >= BRCMF_MAX_IFS) {
brcmf_err("invalid interface index: %u\n", ifevent->ifidx);
return;
}
ifp = drvr->iflist[ifevent->bsscfgidx];
if (ifevent->action == BRCMF_E_IF_ADD) {
brcmf_dbg(EVENT, "adding %s (%pM)\n", emsg->ifname,
emsg->addr);
ifp = brcmf_add_if(drvr, ifevent->bsscfgidx, ifevent->ifidx,
is_p2pdev, emsg->ifname, emsg->addr);
if (IS_ERR(ifp))
return;
if (!is_p2pdev)
brcmf_fws_add_interface(ifp);
if (!drvr->fweh.evt_handler[BRCMF_E_IF])
if (brcmf_net_attach(ifp, false) < 0)
return;
}
if (ifp && ifevent->action == BRCMF_E_IF_CHANGE)
brcmf_fws_reset_interface(ifp);
err = brcmf_fweh_call_event_handler(ifp, emsg->event_code, emsg, data);
if (ifp && ifevent->action == BRCMF_E_IF_DEL) {
bool armed = brcmf_cfg80211_vif_event_armed(drvr->config);
/* Default handling in case no-one waits for this event */
if (!armed)
brcmf_remove_interface(ifp, false);
}
}
/**
* brcmf_fweh_dequeue_event() - get event from the queue.
*
* @fweh: firmware event handling info.
*/
static struct brcmf_fweh_queue_item *
brcmf_fweh_dequeue_event(struct brcmf_fweh_info *fweh)
{
struct brcmf_fweh_queue_item *event = NULL;
ulong flags;
spin_lock_irqsave(&fweh->evt_q_lock, flags);
if (!list_empty(&fweh->event_q)) {
event = list_first_entry(&fweh->event_q,
struct brcmf_fweh_queue_item, q);
list_del(&event->q);
}
spin_unlock_irqrestore(&fweh->evt_q_lock, flags);
return event;
}
/**
* brcmf_fweh_event_worker() - firmware event worker.
*
* @work: worker object.
*/
static void brcmf_fweh_event_worker(struct work_struct *work)
{
struct brcmf_pub *drvr;
struct brcmf_if *ifp;
struct brcmf_fweh_info *fweh;
struct brcmf_fweh_queue_item *event;
int err = 0;
struct brcmf_event_msg_be *emsg_be;
struct brcmf_event_msg emsg;
fweh = container_of(work, struct brcmf_fweh_info, event_work);
drvr = container_of(fweh, struct brcmf_pub, fweh);
while ((event = brcmf_fweh_dequeue_event(fweh))) {
brcmf_dbg(EVENT, "event %s (%u) ifidx %u bsscfg %u addr %pM\n",
brcmf_fweh_event_name(event->code), event->code,
event->emsg.ifidx, event->emsg.bsscfgidx,
event->emsg.addr);
/* convert event message */
emsg_be = &event->emsg;
emsg.version = be16_to_cpu(emsg_be->version);
emsg.flags = be16_to_cpu(emsg_be->flags);
emsg.event_code = event->code;
emsg.status = be32_to_cpu(emsg_be->status);
emsg.reason = be32_to_cpu(emsg_be->reason);
emsg.auth_type = be32_to_cpu(emsg_be->auth_type);
emsg.datalen = be32_to_cpu(emsg_be->datalen);
memcpy(emsg.addr, emsg_be->addr, ETH_ALEN);
memcpy(emsg.ifname, emsg_be->ifname, sizeof(emsg.ifname));
emsg.ifidx = emsg_be->ifidx;
emsg.bsscfgidx = emsg_be->bsscfgidx;
brcmf_dbg(EVENT, " version %u flags %u status %u reason %u\n",
emsg.version, emsg.flags, emsg.status, emsg.reason);
brcmf_dbg_hex_dump(BRCMF_EVENT_ON(), event->data,
min_t(u32, emsg.datalen, 64),
"event payload, len=%d\n", emsg.datalen);
/* special handling of interface event */
if (event->code == BRCMF_E_IF) {
brcmf_fweh_handle_if_event(drvr, &emsg, event->data);
goto event_free;
}
if (event->code == BRCMF_E_TDLS_PEER_EVENT)
ifp = drvr->iflist[0];
else
ifp = drvr->iflist[emsg.bsscfgidx];
err = brcmf_fweh_call_event_handler(ifp, event->code, &emsg,
event->data);
if (err) {
brcmf_err("event handler failed (%d)\n",
event->code);
err = 0;
}
event_free:
kfree(event);
}
}
/**
* brcmf_fweh_p2pdev_setup() - P2P device setup ongoing (or not).
*
* @ifp: ifp on which setup is taking place or finished.
* @ongoing: p2p device setup in progress (or not).
*/
void brcmf_fweh_p2pdev_setup(struct brcmf_if *ifp, bool ongoing)
{
ifp->drvr->fweh.p2pdev_setup_ongoing = ongoing;
}
/**
* brcmf_fweh_attach() - initialize firmware event handling.
*
* @drvr: driver information object.
*/
void brcmf_fweh_attach(struct brcmf_pub *drvr)
{
struct brcmf_fweh_info *fweh = &drvr->fweh;
INIT_WORK(&fweh->event_work, brcmf_fweh_event_worker);
spin_lock_init(&fweh->evt_q_lock);
INIT_LIST_HEAD(&fweh->event_q);
}
/**
* brcmf_fweh_detach() - cleanup firmware event handling.
*
* @drvr: driver information object.
*/
void brcmf_fweh_detach(struct brcmf_pub *drvr)
{
struct brcmf_fweh_info *fweh = &drvr->fweh;
struct brcmf_if *ifp = brcmf_get_ifp(drvr, 0);
s8 eventmask[BRCMF_EVENTING_MASK_LEN];
if (ifp) {
/* clear all events */
memset(eventmask, 0, BRCMF_EVENTING_MASK_LEN);
(void)brcmf_fil_iovar_data_set(ifp, "event_msgs",
eventmask,
BRCMF_EVENTING_MASK_LEN);
}
/* cancel the worker */
cancel_work_sync(&fweh->event_work);
WARN_ON(!list_empty(&fweh->event_q));
memset(fweh->evt_handler, 0, sizeof(fweh->evt_handler));
}
/**
* brcmf_fweh_register() - register handler for given event code.
*
* @drvr: driver information object.
* @code: event code.
* @handler: handler for the given event code.
*/
int brcmf_fweh_register(struct brcmf_pub *drvr, enum brcmf_fweh_event_code code,
brcmf_fweh_handler_t handler)
{
if (drvr->fweh.evt_handler[code]) {
brcmf_err("event code %d already registered\n", code);
return -ENOSPC;
}
drvr->fweh.evt_handler[code] = handler;
brcmf_dbg(TRACE, "event handler registered for %s\n",
brcmf_fweh_event_name(code));
return 0;
}
/**
* brcmf_fweh_unregister() - remove handler for given code.
*
* @drvr: driver information object.
* @code: event code.
*/
void brcmf_fweh_unregister(struct brcmf_pub *drvr,
enum brcmf_fweh_event_code code)
{
brcmf_dbg(TRACE, "event handler cleared for %s\n",
brcmf_fweh_event_name(code));
drvr->fweh.evt_handler[code] = NULL;
}
/**
* brcmf_fweh_activate_events() - enables firmware events registered.
*
* @ifp: primary interface object.
*/
int brcmf_fweh_activate_events(struct brcmf_if *ifp)
{
int i, err;
s8 eventmask[BRCMF_EVENTING_MASK_LEN];
memset(eventmask, 0, sizeof(eventmask));
for (i = 0; i < BRCMF_E_LAST; i++) {
if (ifp->drvr->fweh.evt_handler[i]) {
brcmf_dbg(EVENT, "enable event %s\n",
brcmf_fweh_event_name(i));
setbit(eventmask, i);
}
}
/* want to handle IF event as well */
brcmf_dbg(EVENT, "enable event IF\n");
setbit(eventmask, BRCMF_E_IF);
err = brcmf_fil_iovar_data_set(ifp, "event_msgs",
eventmask, BRCMF_EVENTING_MASK_LEN);
if (err)
brcmf_err("Set event_msgs error (%d)\n", err);
return err;
}
/**
* brcmf_fweh_process_event() - process skb as firmware event.
*
* @drvr: driver information object.
* @event_packet: event packet to process.
*
* If the packet buffer contains a firmware event message it will
* dispatch the event to a registered handler (using worker).
*/
void brcmf_fweh_process_event(struct brcmf_pub *drvr,
struct brcmf_event *event_packet,
u32 packet_len)
{
enum brcmf_fweh_event_code code;
struct brcmf_fweh_info *fweh = &drvr->fweh;
struct brcmf_fweh_queue_item *event;
gfp_t alloc_flag = GFP_KERNEL;
void *data;
u32 datalen;
/* get event info */
code = get_unaligned_be32(&event_packet->msg.event_type);
datalen = get_unaligned_be32(&event_packet->msg.datalen);
data = &event_packet[1];
if (code >= BRCMF_E_LAST)
return;
if (code != BRCMF_E_IF && !fweh->evt_handler[code])
return;
if (datalen > BRCMF_DCMD_MAXLEN ||
datalen + sizeof(*event_packet) > packet_len)
return;
if (in_interrupt())
alloc_flag = GFP_ATOMIC;
event = kzalloc(sizeof(*event) + datalen, alloc_flag);
if (!event)
return;
event->code = code;
event->ifidx = event_packet->msg.ifidx;
/* use memcpy to get aligned event message */
memcpy(&event->emsg, &event_packet->msg, sizeof(event->emsg));
memcpy(event->data, data, datalen);
event->datalen = datalen;
memcpy(event->ifaddr, event_packet->eth.h_dest, ETH_ALEN);
brcmf_fweh_queue_event(fweh, event);
}