/* * Copyright (c) 2010 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 #include #include #include #include #include #include #include #include #include #include #include #include "dhd.h" #include "dhd_proto.h" #include "dhd_dbg.h" #include "dhd_bus.h" #include "fwil.h" #include "fweh.h" #include "fwsignal.h" /** * DOC: Firmware Signalling * * Firmware can send signals to host and vice versa, which are passed in the * data packets using TLV based header. This signalling layer is on top of the * BDC bus protocol layer. */ /* * single definition for firmware-driver flow control tlv's. * * each tlv is specified by BRCMF_FWS_TLV_DEF(name, ID, length). * A length value 0 indicates variable length tlv. */ #define BRCMF_FWS_TLV_DEFLIST \ BRCMF_FWS_TLV_DEF(MAC_OPEN, 1, 1) \ BRCMF_FWS_TLV_DEF(MAC_CLOSE, 2, 1) \ BRCMF_FWS_TLV_DEF(MAC_REQUEST_CREDIT, 3, 2) \ BRCMF_FWS_TLV_DEF(TXSTATUS, 4, 4) \ BRCMF_FWS_TLV_DEF(PKTTAG, 5, 4) \ BRCMF_FWS_TLV_DEF(MACDESC_ADD, 6, 8) \ BRCMF_FWS_TLV_DEF(MACDESC_DEL, 7, 8) \ BRCMF_FWS_TLV_DEF(RSSI, 8, 1) \ BRCMF_FWS_TLV_DEF(INTERFACE_OPEN, 9, 1) \ BRCMF_FWS_TLV_DEF(INTERFACE_CLOSE, 10, 1) \ BRCMF_FWS_TLV_DEF(FIFO_CREDITBACK, 11, 6) \ BRCMF_FWS_TLV_DEF(PENDING_TRAFFIC_BMP, 12, 2) \ BRCMF_FWS_TLV_DEF(MAC_REQUEST_PACKET, 13, 3) \ BRCMF_FWS_TLV_DEF(HOST_REORDER_RXPKTS, 14, 10) \ BRCMF_FWS_TLV_DEF(TRANS_ID, 18, 6) \ BRCMF_FWS_TLV_DEF(COMP_TXSTATUS, 19, 1) \ BRCMF_FWS_TLV_DEF(FILLER, 255, 0) /* * enum brcmf_fws_tlv_type - definition of tlv identifiers. */ #define BRCMF_FWS_TLV_DEF(name, id, len) \ BRCMF_FWS_TYPE_ ## name = id, enum brcmf_fws_tlv_type { BRCMF_FWS_TLV_DEFLIST BRCMF_FWS_TYPE_INVALID }; #undef BRCMF_FWS_TLV_DEF /* * enum brcmf_fws_tlv_len - definition of tlv lengths. */ #define BRCMF_FWS_TLV_DEF(name, id, len) \ BRCMF_FWS_TYPE_ ## name ## _LEN = (len), enum brcmf_fws_tlv_len { BRCMF_FWS_TLV_DEFLIST }; #undef BRCMF_FWS_TLV_DEF #ifdef DEBUG /* * brcmf_fws_tlv_names - array of tlv names. */ #define BRCMF_FWS_TLV_DEF(name, id, len) \ { id, #name }, static struct { enum brcmf_fws_tlv_type id; const char *name; } brcmf_fws_tlv_names[] = { BRCMF_FWS_TLV_DEFLIST }; #undef BRCMF_FWS_TLV_DEF static const char *brcmf_fws_get_tlv_name(enum brcmf_fws_tlv_type id) { int i; for (i = 0; i < ARRAY_SIZE(brcmf_fws_tlv_names); i++) if (brcmf_fws_tlv_names[i].id == id) return brcmf_fws_tlv_names[i].name; return "INVALID"; } #else static const char *brcmf_fws_get_tlv_name(enum brcmf_fws_tlv_type id) { return "NODEBUG"; } #endif /* DEBUG */ /* * flags used to enable tlv signalling from firmware. */ #define BRCMF_FWS_FLAGS_RSSI_SIGNALS 0x0001 #define BRCMF_FWS_FLAGS_XONXOFF_SIGNALS 0x0002 #define BRCMF_FWS_FLAGS_CREDIT_STATUS_SIGNALS 0x0004 #define BRCMF_FWS_FLAGS_HOST_PROPTXSTATUS_ACTIVE 0x0008 #define BRCMF_FWS_FLAGS_PSQ_GENERATIONFSM_ENABLE 0x0010 #define BRCMF_FWS_FLAGS_PSQ_ZERO_BUFFER_ENABLE 0x0020 #define BRCMF_FWS_FLAGS_HOST_RXREORDER_ACTIVE 0x0040 #define BRCMF_FWS_MAC_DESC_TABLE_SIZE 32 #define BRCMF_FWS_MAC_DESC_ID_INVALID 0xff #define BRCMF_FWS_HOSTIF_FLOWSTATE_OFF 0 #define BRCMF_FWS_HOSTIF_FLOWSTATE_ON 1 #define BRCMF_FWS_FLOWCONTROL_HIWATER 128 #define BRCMF_FWS_FLOWCONTROL_LOWATER 64 #define BRCMF_FWS_PSQ_PREC_COUNT ((NL80211_NUM_ACS + 1) * 2) #define BRCMF_FWS_PSQ_LEN 256 #define BRCMF_FWS_HTOD_FLAG_PKTFROMHOST 0x01 #define BRCMF_FWS_HTOD_FLAG_PKT_REQUESTED 0x02 /** * enum brcmf_fws_skb_state - indicates processing state of skb. * * @BRCMF_FWS_SKBSTATE_NEW: sk_buff is newly arrived in the driver. * @BRCMF_FWS_SKBSTATE_DELAYED: sk_buff had to wait on queue. * @BRCMF_FWS_SKBSTATE_SUPPRESSED: sk_buff has been suppressed by firmware. */ enum brcmf_fws_skb_state { BRCMF_FWS_SKBSTATE_NEW, BRCMF_FWS_SKBSTATE_DELAYED, BRCMF_FWS_SKBSTATE_SUPPRESSED }; /** * struct brcmf_skbuff_cb - control buffer associated with skbuff. * * @if_flags: holds interface index and packet related flags. * @htod: host to device packet identifier (used in PKTTAG tlv). * @state: transmit state of the packet. * @mac: descriptor related to destination for this packet. * * This information is stored in control buffer struct sk_buff::cb, which * provides 48 bytes of storage so this structure should not exceed that. */ struct brcmf_skbuff_cb { u16 if_flags; u32 htod; enum brcmf_fws_skb_state state; struct brcmf_fws_mac_descriptor *mac; }; /* * macro casting skbuff control buffer to struct brcmf_skbuff_cb. */ #define brcmf_skbcb(skb) ((struct brcmf_skbuff_cb *)((skb)->cb)) /* * sk_buff control if flags * * b[11] - packet sent upon firmware request. * b[10] - packet only contains signalling data. * b[9] - packet is a tx packet. * b[8] - packet uses FIFO credit (non-pspoll). * b[7] - interface in AP mode. * b[6:4] - AC FIFO number. * b[3:0] - interface index. */ #define BRCMF_SKB_IF_FLAGS_REQUESTED_MASK 0x0800 #define BRCMF_SKB_IF_FLAGS_REQUESTED_SHIFT 11 #define BRCMF_SKB_IF_FLAGS_SIGNAL_ONLY_MASK 0x0400 #define BRCMF_SKB_IF_FLAGS_SIGNAL_ONLY_SHIFT 10 #define BRCMF_SKB_IF_FLAGS_TRANSMIT_MASK 0x0200 #define BRCMF_SKB_IF_FLAGS_TRANSMIT_SHIFT 9 #define BRCMF_SKB_IF_FLAGS_CREDITCHECK_MASK 0x0100 #define BRCMF_SKB_IF_FLAGS_CREDITCHECK_SHIFT 8 #define BRCMF_SKB_IF_FLAGS_IF_AP_MASK 0x0080 #define BRCMF_SKB_IF_FLAGS_IF_AP_SHIFT 7 #define BRCMF_SKB_IF_FLAGS_FIFO_MASK 0x0070 #define BRCMF_SKB_IF_FLAGS_FIFO_SHIFT 4 #define BRCMF_SKB_IF_FLAGS_INDEX_MASK 0x000f #define BRCMF_SKB_IF_FLAGS_INDEX_SHIFT 0 #define brcmf_skb_if_flags_set_field(skb, field, value) \ brcmu_maskset16(&(brcmf_skbcb(skb)->if_flags), \ BRCMF_SKB_IF_FLAGS_ ## field ## _MASK, \ BRCMF_SKB_IF_FLAGS_ ## field ## _SHIFT, (value)) #define brcmf_skb_if_flags_get_field(skb, field) \ brcmu_maskget16(brcmf_skbcb(skb)->if_flags, \ BRCMF_SKB_IF_FLAGS_ ## field ## _MASK, \ BRCMF_SKB_IF_FLAGS_ ## field ## _SHIFT) /* * sk_buff control packet identifier * * 32-bit packet identifier used in PKTTAG tlv from host to dongle. * * - Generated at the host (e.g. dhd) * - Seen as a generic sequence number by firmware except for the flags field. * * Generation : b[31] => generation number for this packet [host->fw] * OR, current generation number [fw->host] * Flags : b[30:27] => command, status flags * FIFO-AC : b[26:24] => AC-FIFO id * h-slot : b[23:8] => hanger-slot * freerun : b[7:0] => A free running counter */ #define BRCMF_SKB_HTOD_TAG_GENERATION_MASK 0x80000000 #define BRCMF_SKB_HTOD_TAG_GENERATION_SHIFT 31 #define BRCMF_SKB_HTOD_TAG_FLAGS_MASK 0x78000000 #define BRCMF_SKB_HTOD_TAG_FLAGS_SHIFT 27 #define BRCMF_SKB_HTOD_TAG_FIFO_MASK 0x07000000 #define BRCMF_SKB_HTOD_TAG_FIFO_SHIFT 24 #define BRCMF_SKB_HTOD_TAG_HSLOT_MASK 0x00ffff00 #define BRCMF_SKB_HTOD_TAG_HSLOT_SHIFT 8 #define BRCMF_SKB_HTOD_TAG_FREERUN_MASK 0x000000ff #define BRCMF_SKB_HTOD_TAG_FREERUN_SHIFT 0 #define brcmf_skb_htod_tag_set_field(skb, field, value) \ brcmu_maskset32(&(brcmf_skbcb(skb)->htod), \ BRCMF_SKB_HTOD_TAG_ ## field ## _MASK, \ BRCMF_SKB_HTOD_TAG_ ## field ## _SHIFT, (value)) #define brcmf_skb_htod_tag_get_field(skb, field) \ brcmu_maskget32(brcmf_skbcb(skb)->htod, \ BRCMF_SKB_HTOD_TAG_ ## field ## _MASK, \ BRCMF_SKB_HTOD_TAG_ ## field ## _SHIFT) #define BRCMF_FWS_TXSTAT_GENERATION_MASK 0x80000000 #define BRCMF_FWS_TXSTAT_GENERATION_SHIFT 31 #define BRCMF_FWS_TXSTAT_FLAGS_MASK 0x78000000 #define BRCMF_FWS_TXSTAT_FLAGS_SHIFT 27 #define BRCMF_FWS_TXSTAT_FIFO_MASK 0x07000000 #define BRCMF_FWS_TXSTAT_FIFO_SHIFT 24 #define BRCMF_FWS_TXSTAT_HSLOT_MASK 0x00FFFF00 #define BRCMF_FWS_TXSTAT_HSLOT_SHIFT 8 #define BRCMF_FWS_TXSTAT_PKTID_MASK 0x00FFFFFF #define BRCMF_FWS_TXSTAT_PKTID_SHIFT 0 #define brcmf_txstatus_get_field(txs, field) \ brcmu_maskget32(txs, BRCMF_FWS_TXSTAT_ ## field ## _MASK, \ BRCMF_FWS_TXSTAT_ ## field ## _SHIFT) /** * enum brcmf_fws_fifo - fifo indices used by dongle firmware. * * @BRCMF_FWS_FIFO_AC_BK: fifo for background traffic. * @BRCMF_FWS_FIFO_AC_BE: fifo for best-effort traffic. * @BRCMF_FWS_FIFO_AC_VI: fifo for video traffic. * @BRCMF_FWS_FIFO_AC_VO: fifo for voice traffic. * @BRCMF_FWS_FIFO_BCMC: fifo for broadcast/multicast (AP only). * @BRCMF_FWS_FIFO_ATIM: fifo for ATIM (AP only). * @BRCMF_FWS_FIFO_COUNT: number of fifos. */ enum brcmf_fws_fifo { BRCMF_FWS_FIFO_AC_BK, BRCMF_FWS_FIFO_AC_BE, BRCMF_FWS_FIFO_AC_VI, BRCMF_FWS_FIFO_AC_VO, BRCMF_FWS_FIFO_BCMC, BRCMF_FWS_FIFO_ATIM, BRCMF_FWS_FIFO_COUNT }; /** * enum brcmf_fws_txstatus - txstatus flag values. * * @BRCMF_FWS_TXSTATUS_DISCARD: * host is free to discard the packet. * @BRCMF_FWS_TXSTATUS_CORE_SUPPRESS: * 802.11 core suppressed the packet. * @BRCMF_FWS_TXSTATUS_FW_PS_SUPPRESS: * firmware suppress the packet as device is already in PS mode. * @BRCMF_FWS_TXSTATUS_FW_TOSSED: * firmware tossed the packet. */ enum brcmf_fws_txstatus { BRCMF_FWS_TXSTATUS_DISCARD, BRCMF_FWS_TXSTATUS_CORE_SUPPRESS, BRCMF_FWS_TXSTATUS_FW_PS_SUPPRESS, BRCMF_FWS_TXSTATUS_FW_TOSSED }; enum brcmf_fws_fcmode { BRCMF_FWS_FCMODE_NONE, BRCMF_FWS_FCMODE_IMPLIED_CREDIT, BRCMF_FWS_FCMODE_EXPLICIT_CREDIT }; enum brcmf_fws_mac_desc_state { BRCMF_FWS_STATE_OPEN = 1, BRCMF_FWS_STATE_CLOSE }; /** * struct brcmf_fws_mac_descriptor - firmware signalling data per node/interface * * @occupied: slot is in use. * @mac_handle: handle for mac entry determined by firmware. * @interface_id: interface index. * @state: current state. * @suppressed: mac entry is suppressed. * @generation: generation bit. * @ac_bitmap: ac queue bitmap. * @requested_credit: credits requested by firmware. * @ea: ethernet address. * @seq: per-node free-running sequence. * @psq: power-save queue. * @transit_count: packet in transit to firmware. */ struct brcmf_fws_mac_descriptor { u8 occupied; u8 mac_handle; u8 interface_id; u8 state; bool suppressed; u8 generation; u8 ac_bitmap; u8 requested_credit; u8 requested_packet; u8 ea[ETH_ALEN]; u8 seq[BRCMF_FWS_FIFO_COUNT]; struct pktq psq; int transit_count; int suppress_count; int suppr_transit_count; bool send_tim_signal; u8 traffic_pending_bmp; u8 traffic_lastreported_bmp; }; #define BRCMF_FWS_HANGER_MAXITEMS 1024 /** * enum brcmf_fws_hanger_item_state - state of hanger item. * * @BRCMF_FWS_HANGER_ITEM_STATE_FREE: item is free for use. * @BRCMF_FWS_HANGER_ITEM_STATE_INUSE: item is in use. * @BRCMF_FWS_HANGER_ITEM_STATE_INUSE_SUPPRESSED: item was suppressed. */ enum brcmf_fws_hanger_item_state { BRCMF_FWS_HANGER_ITEM_STATE_FREE = 1, BRCMF_FWS_HANGER_ITEM_STATE_INUSE, BRCMF_FWS_HANGER_ITEM_STATE_INUSE_SUPPRESSED }; /** * struct brcmf_fws_hanger_item - single entry for tx pending packet. * * @state: entry is either free or occupied. * @gen: generation. * @pkt: packet itself. */ struct brcmf_fws_hanger_item { enum brcmf_fws_hanger_item_state state; u8 gen; struct sk_buff *pkt; }; /** * struct brcmf_fws_hanger - holds packets awaiting firmware txstatus. * * @pushed: packets pushed to await txstatus. * @popped: packets popped upon handling txstatus. * @failed_to_push: packets that could not be pushed. * @failed_to_pop: packets that could not be popped. * @failed_slotfind: packets for which failed to find an entry. * @slot_pos: last returned item index for a free entry. * @items: array of hanger items. */ struct brcmf_fws_hanger { u32 pushed; u32 popped; u32 failed_to_push; u32 failed_to_pop; u32 failed_slotfind; u32 slot_pos; struct brcmf_fws_hanger_item items[BRCMF_FWS_HANGER_MAXITEMS]; }; struct brcmf_fws_macdesc_table { struct brcmf_fws_mac_descriptor nodes[BRCMF_FWS_MAC_DESC_TABLE_SIZE]; struct brcmf_fws_mac_descriptor iface[BRCMF_MAX_IFS]; struct brcmf_fws_mac_descriptor other; }; struct brcmf_fws_info { struct brcmf_pub *drvr; struct brcmf_fws_stats stats; struct brcmf_fws_hanger hanger; enum brcmf_fws_fcmode fcmode; struct brcmf_fws_macdesc_table desc; struct workqueue_struct *fws_wq; struct work_struct fws_dequeue_work; u32 fifo_enqpkt[BRCMF_FWS_FIFO_COUNT]; int fifo_credit[BRCMF_FWS_FIFO_COUNT]; int deq_node_pos[BRCMF_FWS_FIFO_COUNT]; u32 fifo_credit_map; u32 fifo_delay_map; }; /* * brcmf_fws_prio2fifo - mapping from 802.1d priority to firmware fifo index. */ static const int brcmf_fws_prio2fifo[] = { BRCMF_FWS_FIFO_AC_BE, BRCMF_FWS_FIFO_AC_BK, BRCMF_FWS_FIFO_AC_BK, BRCMF_FWS_FIFO_AC_BE, BRCMF_FWS_FIFO_AC_VI, BRCMF_FWS_FIFO_AC_VI, BRCMF_FWS_FIFO_AC_VO, BRCMF_FWS_FIFO_AC_VO }; static int fcmode; module_param(fcmode, int, S_IRUSR); MODULE_PARM_DESC(fcmode, "mode of firmware signalled flow control"); #define BRCMF_FWS_TLV_DEF(name, id, len) \ case BRCMF_FWS_TYPE_ ## name: \ return len; /** * brcmf_fws_get_tlv_len() - returns defined length for given tlv id. * * @fws: firmware-signalling information. * @id: identifier of the TLV. * * Return: the specified length for the given TLV; Otherwise -EINVAL. */ static int brcmf_fws_get_tlv_len(struct brcmf_fws_info *fws, enum brcmf_fws_tlv_type id) { switch (id) { BRCMF_FWS_TLV_DEFLIST default: fws->stats.tlv_invalid_type++; break; } return -EINVAL; } #undef BRCMF_FWS_TLV_DEF static bool brcmf_fws_ifidx_match(struct sk_buff *skb, void *arg) { u32 ifidx = brcmf_skb_if_flags_get_field(skb, INDEX); return ifidx == *(int *)arg; } static void brcmf_fws_psq_flush(struct brcmf_fws_info *fws, struct pktq *q, int ifidx) { bool (*matchfn)(struct sk_buff *, void *) = NULL; struct sk_buff *skb; int prec; if (ifidx != -1) matchfn = brcmf_fws_ifidx_match; for (prec = 0; prec < q->num_prec; prec++) { skb = brcmu_pktq_pdeq_match(q, prec, matchfn, &ifidx); while (skb) { brcmu_pkt_buf_free_skb(skb); skb = brcmu_pktq_pdeq_match(q, prec, matchfn, &ifidx); } } } static void brcmf_fws_hanger_init(struct brcmf_fws_hanger *hanger) { int i; brcmf_dbg(TRACE, "enter\n"); memset(hanger, 0, sizeof(*hanger)); for (i = 0; i < ARRAY_SIZE(hanger->items); i++) hanger->items[i].state = BRCMF_FWS_HANGER_ITEM_STATE_FREE; } static u32 brcmf_fws_hanger_get_free_slot(struct brcmf_fws_hanger *h) { u32 i; brcmf_dbg(TRACE, "enter\n"); i = (h->slot_pos + 1) % BRCMF_FWS_HANGER_MAXITEMS; while (i != h->slot_pos) { if (h->items[i].state == BRCMF_FWS_HANGER_ITEM_STATE_FREE) { h->slot_pos = i; goto done; } i++; if (i == BRCMF_FWS_HANGER_MAXITEMS) i = 0; } brcmf_err("all slots occupied\n"); h->failed_slotfind++; i = BRCMF_FWS_HANGER_MAXITEMS; done: brcmf_dbg(TRACE, "exit: %d\n", i); return i; } static int brcmf_fws_hanger_pushpkt(struct brcmf_fws_hanger *h, struct sk_buff *pkt, u32 slot_id) { brcmf_dbg(TRACE, "enter\n"); if (slot_id >= BRCMF_FWS_HANGER_MAXITEMS) return -ENOENT; if (h->items[slot_id].state != BRCMF_FWS_HANGER_ITEM_STATE_FREE) { brcmf_err("slot is not free\n"); h->failed_to_push++; return -EINVAL; } h->items[slot_id].state = BRCMF_FWS_HANGER_ITEM_STATE_INUSE; h->items[slot_id].pkt = pkt; h->pushed++; return 0; } static int brcmf_fws_hanger_poppkt(struct brcmf_fws_hanger *h, u32 slot_id, struct sk_buff **pktout, bool remove_item) { brcmf_dbg(TRACE, "enter\n"); if (slot_id >= BRCMF_FWS_HANGER_MAXITEMS) return -ENOENT; if (h->items[slot_id].state == BRCMF_FWS_HANGER_ITEM_STATE_FREE) { brcmf_err("entry not in use\n"); h->failed_to_pop++; return -EINVAL; } *pktout = h->items[slot_id].pkt; if (remove_item) { h->items[slot_id].state = BRCMF_FWS_HANGER_ITEM_STATE_FREE; h->items[slot_id].pkt = NULL; h->items[slot_id].gen = 0xff; h->popped++; } return 0; } static int brcmf_fws_hanger_mark_suppressed(struct brcmf_fws_hanger *h, u32 slot_id, u8 gen) { brcmf_dbg(TRACE, "enter\n"); if (slot_id >= BRCMF_FWS_HANGER_MAXITEMS) return -ENOENT; h->items[slot_id].gen = gen; if (h->items[slot_id].state != BRCMF_FWS_HANGER_ITEM_STATE_INUSE) { brcmf_err("entry not in use\n"); return -EINVAL; } h->items[slot_id].state = BRCMF_FWS_HANGER_ITEM_STATE_INUSE_SUPPRESSED; return 0; } static int brcmf_fws_hanger_get_genbit(struct brcmf_fws_hanger *hanger, struct sk_buff *pkt, u32 slot_id, int *gen) { brcmf_dbg(TRACE, "enter\n"); *gen = 0xff; if (slot_id >= BRCMF_FWS_HANGER_MAXITEMS) return -ENOENT; if (hanger->items[slot_id].state == BRCMF_FWS_HANGER_ITEM_STATE_FREE) { brcmf_err("slot not in use\n"); return -EINVAL; } *gen = hanger->items[slot_id].gen; return 0; } static void brcmf_fws_hanger_cleanup(struct brcmf_fws_info *fws, bool (*fn)(struct sk_buff *, void *), int ifidx) { struct brcmf_fws_hanger *h = &fws->hanger; struct sk_buff *skb; int i; enum brcmf_fws_hanger_item_state s; brcmf_dbg(TRACE, "enter: ifidx=%d\n", ifidx); for (i = 0; i < ARRAY_SIZE(h->items); i++) { s = h->items[i].state; if (s == BRCMF_FWS_HANGER_ITEM_STATE_INUSE || s == BRCMF_FWS_HANGER_ITEM_STATE_INUSE_SUPPRESSED) { skb = h->items[i].pkt; if (fn == NULL || fn(skb, &ifidx)) { /* suppress packets freed from psq */ if (s == BRCMF_FWS_HANGER_ITEM_STATE_INUSE) brcmu_pkt_buf_free_skb(skb); h->items[i].state = BRCMF_FWS_HANGER_ITEM_STATE_FREE; } } } } static void brcmf_fws_init_mac_descriptor(struct brcmf_fws_mac_descriptor *desc, u8 *addr, u8 ifidx) { brcmf_dbg(TRACE, "enter: desc %p ea=%pM, ifidx=%u\n", desc, addr, ifidx); desc->occupied = 1; desc->state = BRCMF_FWS_STATE_OPEN; desc->requested_credit = 0; /* depending on use may need ifp->bssidx instead */ desc->interface_id = ifidx; desc->ac_bitmap = 0xff; /* update this when handling APSD */ if (addr) memcpy(&desc->ea[0], addr, ETH_ALEN); } static void brcmf_fws_clear_mac_descriptor(struct brcmf_fws_mac_descriptor *desc) { brcmf_dbg(TRACE, "enter: ea=%pM, ifidx=%u\n", desc->ea, desc->interface_id); desc->occupied = 0; desc->state = BRCMF_FWS_STATE_CLOSE; desc->requested_credit = 0; } static struct brcmf_fws_mac_descriptor * brcmf_fws_mac_descriptor_lookup(struct brcmf_fws_info *fws, u8 *ea) { struct brcmf_fws_mac_descriptor *entry; int i; brcmf_dbg(TRACE, "enter: ea=%pM\n", ea); if (ea == NULL) return ERR_PTR(-EINVAL); entry = &fws->desc.nodes[0]; for (i = 0; i < ARRAY_SIZE(fws->desc.nodes); i++) { if (entry->occupied && !memcmp(entry->ea, ea, ETH_ALEN)) return entry; entry++; } return ERR_PTR(-ENOENT); } static struct brcmf_fws_mac_descriptor* brcmf_fws_find_mac_desc(struct brcmf_fws_info *fws, int ifidx, u8 *da) { struct brcmf_fws_mac_descriptor *entry = &fws->desc.other; struct brcmf_if *ifp; bool multicast; brcmf_dbg(TRACE, "enter: ifidx=%d\n", ifidx); multicast = is_multicast_ether_addr(da); ifp = fws->drvr->iflist[ifidx ? ifidx + 1 : 0]; if (WARN_ON(!ifp)) goto done; /* Multicast destination and P2P clients get the interface entry. * STA gets the interface entry if there is no exact match. For * example, TDLS destinations have their own entry. */ entry = NULL; if (multicast && ifp->fws_desc) entry = ifp->fws_desc; if (entry != NULL && multicast) goto done; entry = brcmf_fws_mac_descriptor_lookup(fws, da); if (IS_ERR(entry)) entry = &fws->desc.other; done: brcmf_dbg(TRACE, "exit: entry=%p\n", entry); return entry; } static bool brcmf_fws_mac_desc_ready(struct brcmf_fws_mac_descriptor *entry, int fifo) { bool ready; /* * destination entry is ready when firmware says it is OPEN * and there are no packets enqueued for it. */ ready = entry->state == BRCMF_FWS_STATE_OPEN && !entry->suppressed && brcmu_pktq_mlen(&entry->psq, 3 << (fifo * 2)) == 0; /* * Or when the destination entry is CLOSED, but firmware has * specifically requested packets for this entry. */ ready = ready || (entry->state == BRCMF_FWS_STATE_CLOSE && (entry->requested_credit + entry->requested_packet)); return ready; } static void brcmf_fws_mac_desc_cleanup(struct brcmf_fws_info *fws, struct brcmf_fws_mac_descriptor *entry, int ifidx) { brcmf_dbg(TRACE, "enter: entry=(ea=%pM, ifid=%d), ifidx=%d\n", entry->ea, entry->interface_id, ifidx); if (entry->occupied && (ifidx == -1 || ifidx == entry->interface_id)) { brcmf_dbg(TRACE, "flush psq: ifidx=%d, qlen=%d\n", ifidx, entry->psq.len); brcmf_fws_psq_flush(fws, &entry->psq, ifidx); entry->occupied = !!(entry->psq.len); } } static void brcmf_fws_bus_txq_cleanup(struct brcmf_fws_info *fws, bool (*fn)(struct sk_buff *, void *), int ifidx) { struct brcmf_fws_hanger_item *hi; struct pktq *txq; struct sk_buff *skb; int prec; u32 hslot; brcmf_dbg(TRACE, "enter: ifidx=%d\n", ifidx); txq = brcmf_bus_gettxq(fws->drvr->bus_if); if (IS_ERR(txq)) { brcmf_dbg(TRACE, "no txq to clean up\n"); return; } for (prec = 0; prec < txq->num_prec; prec++) { skb = brcmu_pktq_pdeq_match(txq, prec, fn, &ifidx); while (skb) { hslot = brcmf_skb_htod_tag_get_field(skb, HSLOT); hi = &fws->hanger.items[hslot]; WARN_ON(skb != hi->pkt); hi->state = BRCMF_FWS_HANGER_ITEM_STATE_FREE; brcmu_pkt_buf_free_skb(skb); skb = brcmu_pktq_pdeq_match(txq, prec, fn, &ifidx); } } } static void brcmf_fws_cleanup(struct brcmf_fws_info *fws, int ifidx) { int i; struct brcmf_fws_mac_descriptor *table; bool (*matchfn)(struct sk_buff *, void *) = NULL; brcmf_dbg(TRACE, "enter: ifidx=%d\n", ifidx); if (fws == NULL) return; if (ifidx != -1) matchfn = brcmf_fws_ifidx_match; /* cleanup individual nodes */ table = &fws->desc.nodes[0]; for (i = 0; i < ARRAY_SIZE(fws->desc.nodes); i++) brcmf_fws_mac_desc_cleanup(fws, &table[i], ifidx); brcmf_fws_mac_desc_cleanup(fws, &fws->desc.other, ifidx); brcmf_fws_bus_txq_cleanup(fws, matchfn, ifidx); brcmf_fws_hanger_cleanup(fws, matchfn, ifidx); } static void brcmf_fws_tim_update(struct brcmf_fws_info *ctx, struct brcmf_fws_mac_descriptor *entry, int prec) { brcmf_dbg(TRACE, "enter: ea=%pM\n", entry->ea); if (entry->state == BRCMF_FWS_STATE_CLOSE) { /* check delayedQ and suppressQ in one call using bitmap */ if (brcmu_pktq_mlen(&entry->psq, 3 << (prec * 2)) == 0) entry->traffic_pending_bmp = entry->traffic_pending_bmp & ~NBITVAL(prec); else entry->traffic_pending_bmp = entry->traffic_pending_bmp | NBITVAL(prec); } /* request a TIM update to firmware at the next piggyback opportunity */ if (entry->traffic_lastreported_bmp != entry->traffic_pending_bmp) entry->send_tim_signal = true; } static void brcmf_fws_flow_control_check(struct brcmf_fws_info *fws, struct pktq *pq, u8 if_id) { struct brcmf_if *ifp = fws->drvr->iflist[if_id]; brcmf_dbg(TRACE, "enter: bssidx=%d, ifidx=%d\n", ifp->bssidx, ifp->ifidx); if (WARN_ON(!ifp)) return; if ((ifp->netif_stop & BRCMF_NETIF_STOP_REASON_FWS_FC) && pq->len <= BRCMF_FWS_FLOWCONTROL_LOWATER) brcmf_txflowblock_if(ifp, BRCMF_NETIF_STOP_REASON_FWS_FC, false); if (!(ifp->netif_stop & BRCMF_NETIF_STOP_REASON_FWS_FC) && pq->len >= BRCMF_FWS_FLOWCONTROL_HIWATER) brcmf_txflowblock_if(ifp, BRCMF_NETIF_STOP_REASON_FWS_FC, true); return; } static int brcmf_fws_rssi_indicate(struct brcmf_fws_info *fws, s8 rssi) { brcmf_dbg(CTL, "rssi %d\n", rssi); return 0; } static int brcmf_fws_macdesc_indicate(struct brcmf_fws_info *fws, u8 type, u8 *data) { struct brcmf_fws_mac_descriptor *entry, *existing; u8 mac_handle; u8 ifidx; u8 *addr; mac_handle = *data++; ifidx = *data++; addr = data; entry = &fws->desc.nodes[mac_handle & 0x1F]; if (type == BRCMF_FWS_TYPE_MACDESC_DEL) { brcmf_dbg(TRACE, "deleting mac %pM idx %d\n", addr, ifidx); if (entry->occupied) brcmf_fws_clear_mac_descriptor(entry); else fws->stats.mac_update_failed++; return 0; } brcmf_dbg(TRACE, "add mac %pM handle %u idx %d\n", addr, mac_handle, ifidx); existing = brcmf_fws_mac_descriptor_lookup(fws, addr); if (IS_ERR(existing)) { if (!entry->occupied) { entry->mac_handle = mac_handle; brcmf_fws_init_mac_descriptor(entry, addr, ifidx); brcmu_pktq_init(&entry->psq, BRCMF_FWS_PSQ_PREC_COUNT, BRCMF_FWS_PSQ_LEN); } else { fws->stats.mac_update_failed++; } } else { if (entry != existing) { brcmf_dbg(TRACE, "relocate mac\n"); memcpy(entry, existing, offsetof(struct brcmf_fws_mac_descriptor, psq)); entry->mac_handle = mac_handle; brcmf_fws_clear_mac_descriptor(existing); } else { brcmf_dbg(TRACE, "use existing\n"); WARN_ON(entry->mac_handle != mac_handle); /* TODO: what should we do here: continue, reinit, .. */ } } return 0; } static void brcmf_fws_return_credits(struct brcmf_fws_info *fws, u8 fifo, u8 credits) { if (!credits) return; fws->fifo_credit_map |= 1 << fifo; fws->fifo_credit[fifo] += credits; } static void brcmf_fws_schedule_deq(struct brcmf_fws_info *fws) { /* only schedule dequeue when there are credits for delayed traffic */ if (fws->fifo_credit_map & fws->fifo_delay_map) queue_work(fws->fws_wq, &fws->fws_dequeue_work); } static void brcmf_skb_pick_up_credit(struct brcmf_fws_info *fws, int fifo, struct sk_buff *p) { struct brcmf_fws_mac_descriptor *entry = brcmf_skbcb(p)->mac; if (brcmf_skbcb(p)->if_flags & BRCMF_SKB_IF_FLAGS_CREDITCHECK_MASK) { if (fws->fcmode != BRCMF_FWS_FCMODE_IMPLIED_CREDIT) return; brcmf_fws_return_credits(fws, fifo, 1); } else { /* * if this packet did not count against FIFO credit, it * must have taken a requested_credit from the destination * entry (for pspoll etc.) */ if (!brcmf_skb_if_flags_get_field(p, REQUESTED)) entry->requested_credit++; } brcmf_fws_schedule_deq(fws); } static int brcmf_fws_enq(struct brcmf_fws_info *fws, enum brcmf_fws_skb_state state, int fifo, struct sk_buff *p) { int prec = 2 * fifo; u32 *qfull_stat = &fws->stats.delayq_full_error; struct brcmf_fws_mac_descriptor *entry; entry = brcmf_skbcb(p)->mac; if (entry == NULL) { brcmf_err("no mac descriptor found for skb %p\n", p); return -ENOENT; } brcmf_dbg(TRACE, "enter: ea=%pM, qlen=%d\n", entry->ea, entry->psq.len); if (state == BRCMF_FWS_SKBSTATE_SUPPRESSED) { prec += 1; qfull_stat = &fws->stats.supprq_full_error; } if (brcmu_pktq_penq(&entry->psq, prec, p) == NULL) { *qfull_stat += 1; return -ENFILE; } /* increment total enqueued packet count */ fws->fifo_delay_map |= 1 << fifo; fws->fifo_enqpkt[fifo]++; /* update the sk_buff state */ brcmf_skbcb(p)->state = state; if (state == BRCMF_FWS_SKBSTATE_SUPPRESSED) entry->suppress_count++; /* * A packet has been pushed so update traffic * availability bitmap, if applicable */ brcmf_fws_tim_update(fws, entry, fifo); brcmf_fws_flow_control_check(fws, &entry->psq, brcmf_skb_if_flags_get_field(p, INDEX)); return 0; } static struct sk_buff *brcmf_fws_deq(struct brcmf_fws_info *fws, int fifo) { struct brcmf_fws_mac_descriptor *table; struct brcmf_fws_mac_descriptor *entry; struct sk_buff *p; int use_credit = 1; int num_nodes; int node_pos; int prec_out; int pmsk = 3; int i; table = (struct brcmf_fws_mac_descriptor *)&fws->desc; num_nodes = sizeof(fws->desc) / sizeof(struct brcmf_fws_mac_descriptor); node_pos = fws->deq_node_pos[fifo]; for (i = 0; i < num_nodes; i++) { entry = &table[(node_pos + i) % num_nodes]; if (!entry->occupied) continue; if (entry->suppressed) pmsk = 2; p = brcmu_pktq_mdeq(&entry->psq, pmsk << (fifo * 2), &prec_out); if (p == NULL) { if (entry->suppressed) { if (entry->suppr_transit_count > entry->suppress_count) return NULL; entry->suppressed = false; p = brcmu_pktq_mdeq(&entry->psq, 1 << (fifo * 2), &prec_out); } } if (p == NULL) continue; /* did the packet come from suppress sub-queue? */ if (entry->requested_credit > 0) { entry->requested_credit--; /* * if the packet was pulled out while destination is in * closed state but had a non-zero packets requested, * then this should not count against the FIFO credit. * That is due to the fact that the firmware will * most likely hold onto this packet until a suitable * time later to push it to the appropriate AC FIFO. */ if (entry->state == BRCMF_FWS_STATE_CLOSE) use_credit = 0; } else if (entry->requested_packet > 0) { entry->requested_packet--; brcmf_skb_if_flags_set_field(p, REQUESTED, 1); if (entry->state == BRCMF_FWS_STATE_CLOSE) use_credit = 0; } brcmf_skb_if_flags_set_field(p, CREDITCHECK, use_credit); /* move dequeue position to ensure fair round-robin */ fws->deq_node_pos[fifo] = (node_pos + i + 1) % num_nodes; brcmf_fws_flow_control_check(fws, &entry->psq, brcmf_skb_if_flags_get_field(p, INDEX) ); /* * A packet has been picked up, update traffic * availability bitmap, if applicable */ brcmf_fws_tim_update(fws, entry, fifo); /* * decrement total enqueued fifo packets and * clear delay bitmap if done. */ fws->fifo_enqpkt[fifo]--; if (fws->fifo_enqpkt[fifo] == 0) fws->fifo_delay_map &= ~(1 << fifo); goto done; } p = NULL; done: brcmf_dbg(TRACE, "exit: fifo %d skb %p\n", fifo, p); return p; } static int brcmf_fws_txstatus_suppressed(struct brcmf_fws_info *fws, int fifo, struct sk_buff *skb, u32 genbit) { struct brcmf_fws_mac_descriptor *entry = brcmf_skbcb(skb)->mac; u32 hslot; int ret; hslot = brcmf_skb_htod_tag_get_field(skb, HSLOT); /* this packet was suppressed */ if (!entry->suppressed || entry->generation != genbit) { entry->suppressed = true; entry->suppress_count = brcmu_pktq_mlen(&entry->psq, 1 << (fifo * 2 + 1)); entry->suppr_transit_count = entry->transit_count; } entry->generation = genbit; ret = brcmf_fws_enq(fws, BRCMF_FWS_SKBSTATE_SUPPRESSED, fifo, skb); if (ret != 0) { /* suppress q is full, drop this packet */ brcmf_fws_hanger_poppkt(&fws->hanger, hslot, &skb, true); } else { /* * Mark suppressed to avoid a double free during * wlfc cleanup */ brcmf_fws_hanger_mark_suppressed(&fws->hanger, hslot, genbit); entry->suppress_count++; } return ret; } static int brcmf_fws_txstatus_process(struct brcmf_fws_info *fws, u8 flags, u32 hslot, u32 genbit) { u32 fifo; int ret; bool remove_from_hanger = true; struct sk_buff *skb; struct brcmf_fws_mac_descriptor *entry = NULL; fws->stats.txs_indicate++; brcmf_dbg(TRACE, "status: flags=0x%X, hslot=%d\n", flags, hslot); if (flags == BRCMF_FWS_TXSTATUS_DISCARD) fws->stats.txs_discard++; else if (flags == BRCMF_FWS_TXSTATUS_CORE_SUPPRESS) { fws->stats.txs_supp_core++; remove_from_hanger = false; } else if (flags == BRCMF_FWS_TXSTATUS_FW_PS_SUPPRESS) { fws->stats.txs_supp_ps++; remove_from_hanger = false; } else if (flags == BRCMF_FWS_TXSTATUS_FW_TOSSED) fws->stats.txs_tossed++; else brcmf_err("unexpected txstatus\n"); ret = brcmf_fws_hanger_poppkt(&fws->hanger, hslot, &skb, remove_from_hanger); if (ret != 0) { brcmf_err("no packet in hanger slot: hslot=%d\n", hslot); return ret; } entry = brcmf_skbcb(skb)->mac; if (WARN_ON(!entry)) { brcmu_pkt_buf_free_skb(skb); return -EINVAL; } /* pick up the implicit credit from this packet */ fifo = brcmf_skb_htod_tag_get_field(skb, FIFO); brcmf_skb_pick_up_credit(fws, fifo, skb); if (!remove_from_hanger) ret = brcmf_fws_txstatus_suppressed(fws, fifo, skb, genbit); if (remove_from_hanger || ret) { entry->transit_count--; if (entry->suppressed) entry->suppr_transit_count--; brcmf_txfinalize(fws->drvr, skb, true); } return 0; } static int brcmf_fws_fifocreditback_indicate(struct brcmf_fws_info *fws, u8 *data) { int i; if (fws->fcmode != BRCMF_FWS_FCMODE_EXPLICIT_CREDIT) { brcmf_dbg(INFO, "ignored\n"); return 0; } brcmf_dbg(TRACE, "enter: data %pM\n", data); for (i = 0; i < BRCMF_FWS_FIFO_COUNT; i++) brcmf_fws_return_credits(fws, i, data[i]); brcmf_dbg(INFO, "map: credit %x delay %x\n", fws->fifo_credit_map, fws->fifo_delay_map); brcmf_fws_schedule_deq(fws); return 0; } static int brcmf_fws_txstatus_indicate(struct brcmf_fws_info *fws, u8 *data) { u32 status; u32 hslot; u32 genbit; u8 flags; fws->stats.txs_indicate++; status = le32_to_cpu(*(__le32 *)data); flags = brcmf_txstatus_get_field(status, FLAGS); hslot = brcmf_txstatus_get_field(status, HSLOT); genbit = brcmf_txstatus_get_field(status, GENERATION); return brcmf_fws_txstatus_process(fws, flags, hslot, genbit); } static int brcmf_fws_dbg_seqnum_check(struct brcmf_fws_info *fws, u8 *data) { __le32 timestamp; memcpy(×tamp, &data[2], sizeof(timestamp)); brcmf_dbg(INFO, "received: seq %d, timestamp %d\n", data[1], le32_to_cpu(timestamp)); return 0; } /* using macro so sparse checking does not complain * about locking imbalance. */ #define brcmf_fws_lock(drvr, flags) \ do { \ flags = 0; \ spin_lock_irqsave(&((drvr)->fws_spinlock), (flags)); \ } while (0) /* using macro so sparse checking does not complain * about locking imbalance. */ #define brcmf_fws_unlock(drvr, flags) \ spin_unlock_irqrestore(&((drvr)->fws_spinlock), (flags)) static int brcmf_fws_notify_credit_map(struct brcmf_if *ifp, const struct brcmf_event_msg *e, void *data) { struct brcmf_fws_info *fws = ifp->drvr->fws; int i; ulong flags; u8 *credits = data; if (e->datalen < BRCMF_FWS_FIFO_COUNT) { brcmf_err("event payload too small (%d)\n", e->datalen); return -EINVAL; } brcmf_dbg(TRACE, "enter: credits %pM\n", credits); brcmf_fws_lock(ifp->drvr, flags); for (i = 0; i < ARRAY_SIZE(fws->fifo_credit); i++) { if (*credits) fws->fifo_credit_map |= 1 << i; else fws->fifo_credit_map &= ~(1 << i); fws->fifo_credit[i] = *credits++; } brcmf_fws_schedule_deq(fws); brcmf_fws_unlock(ifp->drvr, flags); return 0; } int brcmf_fws_hdrpull(struct brcmf_pub *drvr, int ifidx, s16 signal_len, struct sk_buff *skb) { struct brcmf_fws_info *fws = drvr->fws; ulong flags; u8 *signal_data; s16 data_len; u8 type; u8 len; u8 *data; brcmf_dbg(TRACE, "enter: ifidx %d, skblen %u, sig %d\n", ifidx, skb->len, signal_len); WARN_ON(signal_len > skb->len); /* if flow control disabled, skip to packet data and leave */ if (!signal_len || !drvr->fw_signals) { skb_pull(skb, signal_len); return 0; } /* lock during tlv parsing */ brcmf_fws_lock(drvr, flags); fws->stats.header_pulls++; data_len = signal_len; signal_data = skb->data; while (data_len > 0) { /* extract tlv info */ type = signal_data[0]; /* FILLER type is actually not a TLV, but * a single byte that can be skipped. */ if (type == BRCMF_FWS_TYPE_FILLER) { signal_data += 1; data_len -= 1; continue; } len = signal_data[1]; data = signal_data + 2; brcmf_dbg(INFO, "tlv type=%d (%s), len=%d, data[0]=%d\n", type, brcmf_fws_get_tlv_name(type), len, *data); /* abort parsing when length invalid */ if (data_len < len + 2) break; if (len != brcmf_fws_get_tlv_len(fws, type)) break; switch (type) { case BRCMF_FWS_TYPE_MAC_OPEN: case BRCMF_FWS_TYPE_MAC_CLOSE: case BRCMF_FWS_TYPE_MAC_REQUEST_CREDIT: case BRCMF_FWS_TYPE_INTERFACE_OPEN: case BRCMF_FWS_TYPE_INTERFACE_CLOSE: case BRCMF_FWS_TYPE_MAC_REQUEST_PACKET: case BRCMF_FWS_TYPE_HOST_REORDER_RXPKTS: case BRCMF_FWS_TYPE_COMP_TXSTATUS: break; case BRCMF_FWS_TYPE_MACDESC_ADD: case BRCMF_FWS_TYPE_MACDESC_DEL: brcmf_fws_macdesc_indicate(fws, type, data); break; case BRCMF_FWS_TYPE_TXSTATUS: brcmf_fws_txstatus_indicate(fws, data); break; case BRCMF_FWS_TYPE_FIFO_CREDITBACK: brcmf_fws_fifocreditback_indicate(fws, data); break; case BRCMF_FWS_TYPE_RSSI: brcmf_fws_rssi_indicate(fws, *data); break; case BRCMF_FWS_TYPE_TRANS_ID: brcmf_fws_dbg_seqnum_check(fws, data); break; case BRCMF_FWS_TYPE_PKTTAG: case BRCMF_FWS_TYPE_PENDING_TRAFFIC_BMP: default: fws->stats.tlv_invalid_type++; break; } signal_data += len + 2; data_len -= len + 2; } if (data_len != 0) fws->stats.tlv_parse_failed++; /* signalling processing result does * not affect the actual ethernet packet. */ skb_pull(skb, signal_len); /* this may be a signal-only packet */ if (skb->len == 0) fws->stats.header_only_pkt++; brcmf_fws_unlock(drvr, flags); return 0; } static int brcmf_fws_hdrpush(struct brcmf_fws_info *fws, struct sk_buff *skb) { struct brcmf_fws_mac_descriptor *entry = brcmf_skbcb(skb)->mac; u8 *wlh; u16 data_offset = 0; u8 fillers; __le32 pkttag = cpu_to_le32(brcmf_skbcb(skb)->htod); brcmf_dbg(TRACE, "enter: ea=%pM, ifidx=%u, pkttag=0x%08X\n", entry->ea, entry->interface_id, le32_to_cpu(pkttag)); if (entry->send_tim_signal) data_offset += 2 + BRCMF_FWS_TYPE_PENDING_TRAFFIC_BMP_LEN; /* +2 is for Type[1] and Len[1] in TLV, plus TIM signal */ data_offset += 2 + BRCMF_FWS_TYPE_PKTTAG_LEN; fillers = round_up(data_offset, 4) - data_offset; data_offset += fillers; skb_push(skb, data_offset); wlh = skb->data; wlh[0] = BRCMF_FWS_TYPE_PKTTAG; wlh[1] = BRCMF_FWS_TYPE_PKTTAG_LEN; memcpy(&wlh[2], &pkttag, sizeof(pkttag)); wlh += BRCMF_FWS_TYPE_PKTTAG_LEN + 2; if (entry->send_tim_signal) { entry->send_tim_signal = 0; wlh[0] = BRCMF_FWS_TYPE_PENDING_TRAFFIC_BMP; wlh[1] = BRCMF_FWS_TYPE_PENDING_TRAFFIC_BMP_LEN; wlh[2] = entry->mac_handle; wlh[3] = entry->traffic_pending_bmp; wlh += BRCMF_FWS_TYPE_PENDING_TRAFFIC_BMP_LEN + 2; entry->traffic_lastreported_bmp = entry->traffic_pending_bmp; } if (fillers) memset(wlh, BRCMF_FWS_TYPE_FILLER, fillers); brcmf_proto_hdrpush(fws->drvr, brcmf_skb_if_flags_get_field(skb, INDEX), data_offset >> 2, skb); return 0; } static int brcmf_fws_precommit_skb(struct brcmf_fws_info *fws, int fifo, struct sk_buff *p) { struct brcmf_skbuff_cb *skcb = brcmf_skbcb(p); struct brcmf_fws_mac_descriptor *entry = skcb->mac; int rc = 0; bool header_needed; int hslot = BRCMF_FWS_HANGER_MAXITEMS; u8 free_ctr; u8 ifidx; u8 flags; header_needed = skcb->state != BRCMF_FWS_SKBSTATE_SUPPRESSED; if (header_needed) { /* obtaining free slot may fail, but that will be caught * by the hanger push. This assures the packet has a BDC * header upon return. */ hslot = brcmf_fws_hanger_get_free_slot(&fws->hanger); free_ctr = entry->seq[fifo]; brcmf_skb_htod_tag_set_field(p, HSLOT, hslot); brcmf_skb_htod_tag_set_field(p, FREERUN, free_ctr); brcmf_skb_htod_tag_set_field(p, GENERATION, 1); entry->transit_count++; } brcmf_skb_if_flags_set_field(p, TRANSMIT, 1); brcmf_skb_htod_tag_set_field(p, FIFO, fifo); flags = BRCMF_FWS_HTOD_FLAG_PKTFROMHOST; if (!(skcb->if_flags & BRCMF_SKB_IF_FLAGS_CREDITCHECK_MASK)) { /* Indicate that this packet is being sent in response to an explicit request from the firmware side. */ flags |= BRCMF_FWS_HTOD_FLAG_PKT_REQUESTED; } brcmf_skb_htod_tag_set_field(p, FLAGS, flags); if (header_needed) { brcmf_fws_hdrpush(fws, p); rc = brcmf_fws_hanger_pushpkt(&fws->hanger, p, hslot); if (rc) brcmf_err("hanger push failed: rc=%d\n", rc); } else { int gen; /* remove old header */ rc = brcmf_proto_hdrpull(fws->drvr, false, &ifidx, p); if (rc == 0) { hslot = brcmf_skb_htod_tag_get_field(p, HSLOT); brcmf_fws_hanger_get_genbit(&fws->hanger, p, hslot, &gen); brcmf_skb_htod_tag_set_field(p, GENERATION, gen); /* push new header */ brcmf_fws_hdrpush(fws, p); } } return rc; } static int brcmf_fws_rollback_toq(struct brcmf_fws_info *fws, struct sk_buff *skb) { /* put the packet back to the head of queue - suppressed packet goes back to suppress sub-queue - pull out the header, if new or delayed packet Note: hslot is used only when header removal is done. */ struct brcmf_fws_mac_descriptor *entry; enum brcmf_fws_skb_state state; struct sk_buff *pktout; int rc = 0; int fifo; int hslot; u8 ifidx; fifo = brcmf_skb_if_flags_get_field(skb, FIFO); state = brcmf_skbcb(skb)->state; entry = brcmf_skbcb(skb)->mac; if (entry != NULL) { if (state == BRCMF_FWS_SKBSTATE_SUPPRESSED) { /* wl-header is saved for suppressed packets */ pktout = brcmu_pktq_penq_head(&entry->psq, 2 * fifo + 1, skb); if (pktout == NULL) { brcmf_err("suppress queue full\n"); rc = -ENOSPC; } } else { hslot = brcmf_skb_htod_tag_get_field(skb, HSLOT); /* remove header first */ rc = brcmf_proto_hdrpull(fws->drvr, false, &ifidx, skb); if (rc) { brcmf_err("header removal failed\n"); /* free the hanger slot */ brcmf_fws_hanger_poppkt(&fws->hanger, hslot, &pktout, true); brcmf_txfinalize(fws->drvr, skb, false); rc = -EINVAL; goto fail; } /* delay-q packets are going to delay-q */ pktout = brcmu_pktq_penq_head(&entry->psq, 2 * fifo, skb); if (pktout == NULL) { brcmf_err("delay queue full\n"); rc = -ENOSPC; } /* free the hanger slot */ brcmf_fws_hanger_poppkt(&fws->hanger, hslot, &pktout, true); /* decrement sequence count */ entry->seq[fifo]--; } /* if this packet did not count against FIFO credit, it must have taken a requested_credit from the firmware (for pspoll etc.) */ if (!(brcmf_skbcb(skb)->if_flags & BRCMF_SKB_IF_FLAGS_CREDITCHECK_MASK)) entry->requested_credit++; } else { brcmf_err("no mac entry linked\n"); rc = -ENOENT; } fail: if (rc) fws->stats.rollback_failed++; else fws->stats.rollback_success++; return rc; } static int brcmf_fws_consume_credit(struct brcmf_fws_info *fws, int fifo, struct sk_buff *skb) { struct brcmf_fws_mac_descriptor *entry = brcmf_skbcb(skb)->mac; int *credit = &fws->fifo_credit[fifo]; int use_credit = 1; brcmf_dbg(TRACE, "enter: ac=%d, credits=%d\n", fifo, *credit); if (entry->requested_credit > 0) { /* * if the packet was pulled out while destination is in * closed state but had a non-zero packets requested, * then this should not count against the FIFO credit. * That is due to the fact that the firmware will * most likely hold onto this packet until a suitable * time later to push it to the appropriate AC FIFO. */ entry->requested_credit--; if (entry->state == BRCMF_FWS_STATE_CLOSE) use_credit = 0; } else if (entry->requested_packet > 0) { entry->requested_packet--; brcmf_skb_if_flags_set_field(skb, REQUESTED, 1); if (entry->state == BRCMF_FWS_STATE_CLOSE) use_credit = 0; } brcmf_skb_if_flags_set_field(skb, CREDITCHECK, use_credit); if (!use_credit) { brcmf_dbg(TRACE, "exit: no creditcheck set\n"); return 0; } if (!(*credit)) { brcmf_dbg(TRACE, "exit: credits depleted\n"); return -ENAVAIL; } (*credit)--; if (!(*credit)) fws->fifo_credit_map &= ~(1 << fifo); brcmf_dbg(TRACE, "exit: ac=%d, credits=%d\n", fifo, *credit); return 0; } static int brcmf_fws_commit_skb(struct brcmf_fws_info *fws, int fifo, struct sk_buff *skb) { struct brcmf_skbuff_cb *skcb = brcmf_skbcb(skb); struct brcmf_fws_mac_descriptor *entry; struct brcmf_bus *bus = fws->drvr->bus_if; int rc; entry = skcb->mac; if (IS_ERR(entry)) return PTR_ERR(entry); rc = brcmf_fws_precommit_skb(fws, fifo, skb); if (rc < 0) { fws->stats.generic_error++; goto rollback; } rc = brcmf_bus_txdata(bus, skb); if (rc < 0) goto rollback; entry->seq[fifo]++; fws->stats.pkt2bus++; if (brcmf_skbcb(skb)->if_flags & BRCMF_SKB_IF_FLAGS_CREDITCHECK_MASK) { fws->stats.send_pkts[fifo]++; fws->stats.fifo_credits_sent[fifo]++; } return rc; rollback: rc = brcmf_fws_rollback_toq(fws, skb); return rc; } int brcmf_fws_process_skb(struct brcmf_if *ifp, struct sk_buff *skb) { struct brcmf_pub *drvr = ifp->drvr; struct brcmf_skbuff_cb *skcb = brcmf_skbcb(skb); struct ethhdr *eh = (struct ethhdr *)(skb->data); ulong flags; u8 ifidx = ifp->ifidx; int fifo = BRCMF_FWS_FIFO_BCMC; bool multicast = is_multicast_ether_addr(eh->h_dest); /* determine the priority */ if (!skb->priority) skb->priority = cfg80211_classify8021d(skb); drvr->tx_multicast += !!multicast; if (ntohs(eh->h_proto) == ETH_P_PAE) atomic_inc(&ifp->pend_8021x_cnt); if (!brcmf_fws_fc_active(drvr->fws)) { /* If the protocol uses a data header, apply it */ brcmf_proto_hdrpush(drvr, ifidx, 0, skb); /* Use bus module to send data frame */ return brcmf_bus_txdata(drvr->bus_if, skb); } /* set control buffer information */ skcb->if_flags = 0; skcb->mac = brcmf_fws_find_mac_desc(drvr->fws, ifidx, eh->h_dest); skcb->state = BRCMF_FWS_SKBSTATE_NEW; brcmf_skb_if_flags_set_field(skb, INDEX, ifidx); if (!multicast) fifo = brcmf_fws_prio2fifo[skb->priority]; brcmf_skb_if_flags_set_field(skb, FIFO, fifo); brcmf_dbg(TRACE, "ea=%pM, multi=%d, fifo=%d\n", eh->h_dest, multicast, fifo); brcmf_fws_lock(drvr, flags); if (!brcmf_fws_mac_desc_ready(skcb->mac, fifo) || (!multicast && brcmf_fws_consume_credit(drvr->fws, fifo, skb) < 0)) { /* enqueue the packet in delayQ */ drvr->fws->fifo_delay_map |= 1 << fifo; brcmf_fws_enq(drvr->fws, BRCMF_FWS_SKBSTATE_DELAYED, fifo, skb); } else { brcmf_fws_commit_skb(drvr->fws, fifo, skb); } brcmf_fws_unlock(drvr, flags); return 0; } void brcmf_fws_reset_interface(struct brcmf_if *ifp) { struct brcmf_fws_mac_descriptor *entry = ifp->fws_desc; brcmf_dbg(TRACE, "enter: idx=%d\n", ifp->bssidx); if (!entry) return; brcmf_fws_init_mac_descriptor(entry, ifp->mac_addr, ifp->ifidx); } void brcmf_fws_add_interface(struct brcmf_if *ifp) { struct brcmf_fws_info *fws = ifp->drvr->fws; struct brcmf_fws_mac_descriptor *entry; brcmf_dbg(TRACE, "enter: idx=%d, mac=%pM\n", ifp->bssidx, ifp->mac_addr); if (!ifp->drvr->fw_signals) return; entry = &fws->desc.iface[ifp->ifidx]; ifp->fws_desc = entry; brcmf_fws_init_mac_descriptor(entry, ifp->mac_addr, ifp->ifidx); brcmu_pktq_init(&entry->psq, BRCMF_FWS_PSQ_PREC_COUNT, BRCMF_FWS_PSQ_LEN); } void brcmf_fws_del_interface(struct brcmf_if *ifp) { struct brcmf_fws_mac_descriptor *entry = ifp->fws_desc; brcmf_dbg(TRACE, "enter: idx=%d\n", ifp->bssidx); if (!entry) return; ifp->fws_desc = NULL; brcmf_fws_clear_mac_descriptor(entry); brcmf_fws_cleanup(ifp->drvr->fws, ifp->ifidx); } static void brcmf_fws_dequeue_worker(struct work_struct *worker) { struct brcmf_fws_info *fws; struct sk_buff *skb; ulong flags; int fifo; int credit; fws = container_of(worker, struct brcmf_fws_info, fws_dequeue_work); brcmf_dbg(TRACE, "enter: fws=%p\n", fws); brcmf_fws_lock(fws->drvr, flags); for (fifo = NL80211_NUM_ACS; fifo >= 0; fifo--) { brcmf_dbg(TRACE, "fifo %d credit %d\n", fifo, fws->fifo_credit[fifo]); for (credit = 0; credit < fws->fifo_credit[fifo]; /* nop */) { skb = brcmf_fws_deq(fws, fifo); if (!skb) break; if (!brcmf_fws_commit_skb(fws, fifo, skb) && brcmf_skbcb(skb)->if_flags & BRCMF_SKB_IF_FLAGS_CREDITCHECK_MASK) credit++; } fws->fifo_credit[fifo] -= credit; } brcmf_fws_unlock(fws->drvr, flags); } int brcmf_fws_init(struct brcmf_pub *drvr) { u32 tlv = BRCMF_FWS_FLAGS_RSSI_SIGNALS; int rc; if (!drvr->fw_signals) return 0; spin_lock_init(&drvr->fws_spinlock); drvr->fws = kzalloc(sizeof(*(drvr->fws)), GFP_KERNEL); if (!drvr->fws) { rc = -ENOMEM; goto fail; } /* set linkage back */ drvr->fws->drvr = drvr; drvr->fws->fcmode = fcmode; drvr->fws->fws_wq = create_singlethread_workqueue("brcmf_fws_wq"); if (drvr->fws->fws_wq == NULL) { brcmf_err("workqueue creation failed\n"); rc = -EBADF; goto fail; } INIT_WORK(&drvr->fws->fws_dequeue_work, brcmf_fws_dequeue_worker); /* enable firmware signalling if fcmode active */ if (drvr->fws->fcmode != BRCMF_FWS_FCMODE_NONE) tlv |= BRCMF_FWS_FLAGS_XONXOFF_SIGNALS | BRCMF_FWS_FLAGS_CREDIT_STATUS_SIGNALS; rc = brcmf_fil_iovar_int_set(drvr->iflist[0], "tlv", tlv); if (rc < 0) { brcmf_err("failed to set bdcv2 tlv signaling\n"); goto fail; } if (brcmf_fweh_register(drvr, BRCMF_E_FIFO_CREDIT_MAP, brcmf_fws_notify_credit_map)) { brcmf_err("register credit map handler failed\n"); goto fail; } brcmf_fws_hanger_init(&drvr->fws->hanger); brcmf_fws_init_mac_descriptor(&drvr->fws->desc.other, NULL, 0); brcmu_pktq_init(&drvr->fws->desc.other.psq, BRCMF_FWS_PSQ_PREC_COUNT, BRCMF_FWS_PSQ_LEN); /* create debugfs file for statistics */ brcmf_debugfs_create_fws_stats(drvr, &drvr->fws->stats); /* TODO: remove upon feature delivery */ brcmf_err("%s bdcv2 tlv signaling [%x]\n", drvr->fw_signals ? "enabled" : "disabled", tlv); return 0; fail: /* disable flow control entirely */ drvr->fw_signals = false; brcmf_fws_deinit(drvr); return rc; } void brcmf_fws_deinit(struct brcmf_pub *drvr) { struct brcmf_fws_info *fws = drvr->fws; ulong flags; if (!fws) return; /* cleanup */ brcmf_fws_lock(drvr, flags); brcmf_fws_cleanup(fws, -1); drvr->fws = NULL; brcmf_fws_unlock(drvr, flags); /* free top structure */ kfree(fws); } bool brcmf_fws_fc_active(struct brcmf_fws_info *fws) { if (!fws) return false; brcmf_dbg(TRACE, "enter: mode=%d\n", fws->fcmode); return fws->fcmode != BRCMF_FWS_FCMODE_NONE; } void brcmf_fws_bustxfail(struct brcmf_fws_info *fws, struct sk_buff *skb) { ulong flags; brcmf_fws_lock(fws->drvr, flags); brcmf_fws_txstatus_process(fws, BRCMF_FWS_TXSTATUS_FW_TOSSED, brcmf_skb_htod_tag_get_field(skb, HSLOT), 0); /* the packet never reached firmware so reclaim credit */ if (fws->fcmode == BRCMF_FWS_FCMODE_EXPLICIT_CREDIT && brcmf_skbcb(skb)->if_flags & BRCMF_SKB_IF_FLAGS_CREDITCHECK_MASK) { brcmf_fws_return_credits(fws, brcmf_skb_htod_tag_get_field(skb, FIFO), 1); brcmf_fws_schedule_deq(fws); } brcmf_fws_unlock(fws->drvr, flags); }