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Release 4.11 drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.c

/*
 * 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.
 */

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"; }

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#else
const char *brcmf_fweh_event_name(enum brcmf_fweh_event_code code) { return "nodebug"; }

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#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); }

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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; }

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/** * 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); } }

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/** * 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; }

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/** * 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); if (emsg.datalen > event->datalen) { brcmf_err("event invalid length header=%d, msg=%d\n", event->datalen, emsg.datalen); goto event_free; } /* 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); } }

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/** * 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; }

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/** * 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); }

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/** * 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)); }

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/** * 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; }

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/** * 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; }

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/** * 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; }

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/** * 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) 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); }

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