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linux-stable/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.h
Sebastian Andrzej Siewior c597ede403 net: brcmfmac: Convey allocation mode as argument 
The usage of in_interrupt() in drivers is phased out and Linus clearly
requested that code which changes behaviour depending on context should
either be seperated or the context be conveyed in an argument passed by the
caller, which usually knows the context.

brcmf_fweh_process_event() uses in_interrupt() to select the allocation
mode GFP_KERNEL/GFP_ATOMIC. Aside of the above reasons this check is
incomplete as it cannot detect contexts which just have preemption or
interrupts disabled.

All callchains leading to brcmf_fweh_process_event() can clearly identify
the calling context. Convey a 'gfp' argument through the callchains and let
the callers hand in the appropriate GFP mode.

This has also the advantage that any change of execution context or
preemption/interrupt state in these callchains will be detected by the
memory allocator for all GFP_KERNEL allocations.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2020-09-29 14:02:55 -07:00

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// SPDX-License-Identifier: ISC
/*
* Copyright (c) 2012 Broadcom Corporation
*/
#ifndef FWEH_H_
#define FWEH_H_
#include <asm/unaligned.h>
#include <linux/skbuff.h>
#include <linux/if_ether.h>
#include <linux/if.h>
/* formward declarations */
struct brcmf_pub;
struct brcmf_if;
struct brcmf_cfg80211_info;
/* list of firmware events */
#define BRCMF_FWEH_EVENT_ENUM_DEFLIST \
BRCMF_ENUM_DEF(SET_SSID, 0) \
BRCMF_ENUM_DEF(JOIN, 1) \
BRCMF_ENUM_DEF(START, 2) \
BRCMF_ENUM_DEF(AUTH, 3) \
BRCMF_ENUM_DEF(AUTH_IND, 4) \
BRCMF_ENUM_DEF(DEAUTH, 5) \
BRCMF_ENUM_DEF(DEAUTH_IND, 6) \
BRCMF_ENUM_DEF(ASSOC, 7) \
BRCMF_ENUM_DEF(ASSOC_IND, 8) \
BRCMF_ENUM_DEF(REASSOC, 9) \
BRCMF_ENUM_DEF(REASSOC_IND, 10) \
BRCMF_ENUM_DEF(DISASSOC, 11) \
BRCMF_ENUM_DEF(DISASSOC_IND, 12) \
BRCMF_ENUM_DEF(QUIET_START, 13) \
BRCMF_ENUM_DEF(QUIET_END, 14) \
BRCMF_ENUM_DEF(BEACON_RX, 15) \
BRCMF_ENUM_DEF(LINK, 16) \
BRCMF_ENUM_DEF(MIC_ERROR, 17) \
BRCMF_ENUM_DEF(NDIS_LINK, 18) \
BRCMF_ENUM_DEF(ROAM, 19) \
BRCMF_ENUM_DEF(TXFAIL, 20) \
BRCMF_ENUM_DEF(PMKID_CACHE, 21) \
BRCMF_ENUM_DEF(RETROGRADE_TSF, 22) \
BRCMF_ENUM_DEF(PRUNE, 23) \
BRCMF_ENUM_DEF(AUTOAUTH, 24) \
BRCMF_ENUM_DEF(EAPOL_MSG, 25) \
BRCMF_ENUM_DEF(SCAN_COMPLETE, 26) \
BRCMF_ENUM_DEF(ADDTS_IND, 27) \
BRCMF_ENUM_DEF(DELTS_IND, 28) \
BRCMF_ENUM_DEF(BCNSENT_IND, 29) \
BRCMF_ENUM_DEF(BCNRX_MSG, 30) \
BRCMF_ENUM_DEF(BCNLOST_MSG, 31) \
BRCMF_ENUM_DEF(ROAM_PREP, 32) \
BRCMF_ENUM_DEF(PFN_NET_FOUND, 33) \
BRCMF_ENUM_DEF(PFN_NET_LOST, 34) \
BRCMF_ENUM_DEF(RESET_COMPLETE, 35) \
BRCMF_ENUM_DEF(JOIN_START, 36) \
BRCMF_ENUM_DEF(ROAM_START, 37) \
BRCMF_ENUM_DEF(ASSOC_START, 38) \
BRCMF_ENUM_DEF(IBSS_ASSOC, 39) \
BRCMF_ENUM_DEF(RADIO, 40) \
BRCMF_ENUM_DEF(PSM_WATCHDOG, 41) \
BRCMF_ENUM_DEF(PROBREQ_MSG, 44) \
BRCMF_ENUM_DEF(SCAN_CONFIRM_IND, 45) \
BRCMF_ENUM_DEF(PSK_SUP, 46) \
BRCMF_ENUM_DEF(COUNTRY_CODE_CHANGED, 47) \
BRCMF_ENUM_DEF(EXCEEDED_MEDIUM_TIME, 48) \
BRCMF_ENUM_DEF(ICV_ERROR, 49) \
BRCMF_ENUM_DEF(UNICAST_DECODE_ERROR, 50) \
BRCMF_ENUM_DEF(MULTICAST_DECODE_ERROR, 51) \
BRCMF_ENUM_DEF(TRACE, 52) \
BRCMF_ENUM_DEF(IF, 54) \
BRCMF_ENUM_DEF(P2P_DISC_LISTEN_COMPLETE, 55) \
BRCMF_ENUM_DEF(RSSI, 56) \
BRCMF_ENUM_DEF(EXTLOG_MSG, 58) \
BRCMF_ENUM_DEF(ACTION_FRAME, 59) \
BRCMF_ENUM_DEF(ACTION_FRAME_COMPLETE, 60) \
BRCMF_ENUM_DEF(PRE_ASSOC_IND, 61) \
BRCMF_ENUM_DEF(PRE_REASSOC_IND, 62) \
BRCMF_ENUM_DEF(CHANNEL_ADOPTED, 63) \
BRCMF_ENUM_DEF(AP_STARTED, 64) \
BRCMF_ENUM_DEF(DFS_AP_STOP, 65) \
BRCMF_ENUM_DEF(DFS_AP_RESUME, 66) \
BRCMF_ENUM_DEF(ESCAN_RESULT, 69) \
BRCMF_ENUM_DEF(ACTION_FRAME_OFF_CHAN_COMPLETE, 70) \
BRCMF_ENUM_DEF(PROBERESP_MSG, 71) \
BRCMF_ENUM_DEF(P2P_PROBEREQ_MSG, 72) \
BRCMF_ENUM_DEF(DCS_REQUEST, 73) \
BRCMF_ENUM_DEF(FIFO_CREDIT_MAP, 74) \
BRCMF_ENUM_DEF(ACTION_FRAME_RX, 75) \
BRCMF_ENUM_DEF(TDLS_PEER_EVENT, 92) \
BRCMF_ENUM_DEF(BCMC_CREDIT_SUPPORT, 127)
#define BRCMF_ENUM_DEF(id, val) \
BRCMF_E_##id = (val),
/* firmware event codes sent by the dongle */
enum brcmf_fweh_event_code {
BRCMF_FWEH_EVENT_ENUM_DEFLIST
/* this determines event mask length which must match
* minimum length check in device firmware so it is
* hard-coded here.
*/
BRCMF_E_LAST = 139
};
#undef BRCMF_ENUM_DEF
#define BRCMF_EVENTING_MASK_LEN DIV_ROUND_UP(BRCMF_E_LAST, 8)
/* flags field values in struct brcmf_event_msg */
#define BRCMF_EVENT_MSG_LINK 0x01
#define BRCMF_EVENT_MSG_FLUSHTXQ 0x02
#define BRCMF_EVENT_MSG_GROUP 0x04
/* status field values in struct brcmf_event_msg */
#define BRCMF_E_STATUS_SUCCESS 0
#define BRCMF_E_STATUS_FAIL 1
#define BRCMF_E_STATUS_TIMEOUT 2
#define BRCMF_E_STATUS_NO_NETWORKS 3
#define BRCMF_E_STATUS_ABORT 4
#define BRCMF_E_STATUS_NO_ACK 5
#define BRCMF_E_STATUS_UNSOLICITED 6
#define BRCMF_E_STATUS_ATTEMPT 7
#define BRCMF_E_STATUS_PARTIAL 8
#define BRCMF_E_STATUS_NEWSCAN 9
#define BRCMF_E_STATUS_NEWASSOC 10
#define BRCMF_E_STATUS_11HQUIET 11
#define BRCMF_E_STATUS_SUPPRESS 12
#define BRCMF_E_STATUS_NOCHANS 13
#define BRCMF_E_STATUS_CS_ABORT 15
#define BRCMF_E_STATUS_ERROR 16
/* status field values for PSK_SUP event */
#define BRCMF_E_STATUS_FWSUP_WAIT_M1 4
#define BRCMF_E_STATUS_FWSUP_PREP_M2 5
#define BRCMF_E_STATUS_FWSUP_COMPLETED 6
#define BRCMF_E_STATUS_FWSUP_TIMEOUT 7
#define BRCMF_E_STATUS_FWSUP_WAIT_M3 8
#define BRCMF_E_STATUS_FWSUP_PREP_M4 9
#define BRCMF_E_STATUS_FWSUP_WAIT_G1 10
#define BRCMF_E_STATUS_FWSUP_PREP_G2 11
/* reason field values in struct brcmf_event_msg */
#define BRCMF_E_REASON_INITIAL_ASSOC 0
#define BRCMF_E_REASON_LOW_RSSI 1
#define BRCMF_E_REASON_DEAUTH 2
#define BRCMF_E_REASON_DISASSOC 3
#define BRCMF_E_REASON_BCNS_LOST 4
#define BRCMF_E_REASON_MINTXRATE 9
#define BRCMF_E_REASON_TXFAIL 10
#define BRCMF_E_REASON_LINK_BSSCFG_DIS 4
#define BRCMF_E_REASON_FAST_ROAM_FAILED 5
#define BRCMF_E_REASON_DIRECTED_ROAM 6
#define BRCMF_E_REASON_TSPEC_REJECTED 7
#define BRCMF_E_REASON_BETTER_AP 8
#define BRCMF_E_REASON_TDLS_PEER_DISCOVERED 0
#define BRCMF_E_REASON_TDLS_PEER_CONNECTED 1
#define BRCMF_E_REASON_TDLS_PEER_DISCONNECTED 2
/* reason field values for PSK_SUP event */
#define BRCMF_E_REASON_FWSUP_OTHER 0
#define BRCMF_E_REASON_FWSUP_DECRYPT_KEY_DATA 1
#define BRCMF_E_REASON_FWSUP_BAD_UCAST_WEP128 2
#define BRCMF_E_REASON_FWSUP_BAD_UCAST_WEP40 3
#define BRCMF_E_REASON_FWSUP_UNSUP_KEY_LEN 4
#define BRCMF_E_REASON_FWSUP_PW_KEY_CIPHER 5
#define BRCMF_E_REASON_FWSUP_MSG3_TOO_MANY_IE 6
#define BRCMF_E_REASON_FWSUP_MSG3_IE_MISMATCH 7
#define BRCMF_E_REASON_FWSUP_NO_INSTALL_FLAG 8
#define BRCMF_E_REASON_FWSUP_MSG3_NO_GTK 9
#define BRCMF_E_REASON_FWSUP_GRP_KEY_CIPHER 10
#define BRCMF_E_REASON_FWSUP_GRP_MSG1_NO_GTK 11
#define BRCMF_E_REASON_FWSUP_GTK_DECRYPT_FAIL 12
#define BRCMF_E_REASON_FWSUP_SEND_FAIL 13
#define BRCMF_E_REASON_FWSUP_DEAUTH 14
#define BRCMF_E_REASON_FWSUP_WPA_PSK_TMO 15
#define BRCMF_E_REASON_FWSUP_WPA_PSK_M1_TMO 16
#define BRCMF_E_REASON_FWSUP_WPA_PSK_M3_TMO 17
/* action field values for brcmf_ifevent */
#define BRCMF_E_IF_ADD 1
#define BRCMF_E_IF_DEL 2
#define BRCMF_E_IF_CHANGE 3
/* flag field values for brcmf_ifevent */
#define BRCMF_E_IF_FLAG_NOIF 1
/* role field values for brcmf_ifevent */
#define BRCMF_E_IF_ROLE_STA 0
#define BRCMF_E_IF_ROLE_AP 1
#define BRCMF_E_IF_ROLE_WDS 2
#define BRCMF_E_IF_ROLE_P2P_GO 3
#define BRCMF_E_IF_ROLE_P2P_CLIENT 4
/**
* definitions for event packet validation.
*/
#define BRCM_OUI "\x00\x10\x18"
#define BCMILCP_BCM_SUBTYPE_EVENT 1
#define BCMILCP_SUBTYPE_VENDOR_LONG 32769
/**
* struct brcm_ethhdr - broadcom specific ether header.
*
* @subtype: subtype for this packet.
* @length: TODO: length of appended data.
* @version: version indication.
* @oui: OUI of this packet.
* @usr_subtype: subtype for this OUI.
*/
struct brcm_ethhdr {
__be16 subtype;
__be16 length;
u8 version;
u8 oui[3];
__be16 usr_subtype;
} __packed;
struct brcmf_event_msg_be {
__be16 version;
__be16 flags;
__be32 event_type;
__be32 status;
__be32 reason;
__be32 auth_type;
__be32 datalen;
u8 addr[ETH_ALEN];
char ifname[IFNAMSIZ];
u8 ifidx;
u8 bsscfgidx;
} __packed;
/**
* struct brcmf_event - contents of broadcom event packet.
*
* @eth: standard ether header.
* @hdr: broadcom specific ether header.
* @msg: common part of the actual event message.
*/
struct brcmf_event {
struct ethhdr eth;
struct brcm_ethhdr hdr;
struct brcmf_event_msg_be msg;
} __packed;
/**
* struct brcmf_event_msg - firmware event message.
*
* @version: version information.
* @flags: event flags.
* @event_code: firmware event code.
* @status: status information.
* @reason: reason code.
* @auth_type: authentication type.
* @datalen: length of event data buffer.
* @addr: ether address.
* @ifname: interface name.
* @ifidx: interface index.
* @bsscfgidx: bsscfg index.
*/
struct brcmf_event_msg {
u16 version;
u16 flags;
u32 event_code;
u32 status;
u32 reason;
s32 auth_type;
u32 datalen;
u8 addr[ETH_ALEN];
char ifname[IFNAMSIZ];
u8 ifidx;
u8 bsscfgidx;
};
struct brcmf_if_event {
u8 ifidx;
u8 action;
u8 flags;
u8 bsscfgidx;
u8 role;
};
typedef int (*brcmf_fweh_handler_t)(struct brcmf_if *ifp,
const struct brcmf_event_msg *evtmsg,
void *data);
/**
* struct brcmf_fweh_info - firmware event handling information.
*
* @p2pdev_setup_ongoing: P2P device creation in progress.
* @event_work: event worker.
* @evt_q_lock: lock for event queue protection.
* @event_q: event queue.
* @evt_handler: registered event handlers.
*/
struct brcmf_fweh_info {
bool p2pdev_setup_ongoing;
struct work_struct event_work;
spinlock_t evt_q_lock;
struct list_head event_q;
int (*evt_handler[BRCMF_E_LAST])(struct brcmf_if *ifp,
const struct brcmf_event_msg *evtmsg,
void *data);
};
const char *brcmf_fweh_event_name(enum brcmf_fweh_event_code code);
void brcmf_fweh_attach(struct brcmf_pub *drvr);
void brcmf_fweh_detach(struct brcmf_pub *drvr);
int brcmf_fweh_register(struct brcmf_pub *drvr, enum brcmf_fweh_event_code code,
int (*handler)(struct brcmf_if *ifp,
const struct brcmf_event_msg *evtmsg,
void *data));
void brcmf_fweh_unregister(struct brcmf_pub *drvr,
enum brcmf_fweh_event_code code);
int brcmf_fweh_activate_events(struct brcmf_if *ifp);
void brcmf_fweh_process_event(struct brcmf_pub *drvr,
struct brcmf_event *event_packet,
u32 packet_len, gfp_t gfp);
void brcmf_fweh_p2pdev_setup(struct brcmf_if *ifp, bool ongoing);
static inline void brcmf_fweh_process_skb(struct brcmf_pub *drvr,
struct sk_buff *skb, u16 stype,
gfp_t gfp)
{
struct brcmf_event *event_packet;
u16 subtype, usr_stype;
/* only process events when protocol matches */
if (skb->protocol != cpu_to_be16(ETH_P_LINK_CTL))
return;
if ((skb->len + ETH_HLEN) < sizeof(*event_packet))
return;
event_packet = (struct brcmf_event *)skb_mac_header(skb);
/* check subtype if needed */
if (unlikely(stype)) {
subtype = get_unaligned_be16(&event_packet->hdr.subtype);
if (subtype != stype)
return;
}
/* check for BRCM oui match */
if (memcmp(BRCM_OUI, &event_packet->hdr.oui[0],
sizeof(event_packet->hdr.oui)))
return;
/* final match on usr_subtype */
usr_stype = get_unaligned_be16(&event_packet->hdr.usr_subtype);
if (usr_stype != BCMILCP_BCM_SUBTYPE_EVENT)
return;
brcmf_fweh_process_event(drvr, event_packet, skb->len + ETH_HLEN, gfp);
}
#endif /* FWEH_H_ */
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