From 11c1064a307a661df20e237e3623e1b5d88641fa Mon Sep 17 00:00:00 2001 From: Christian Lamparter Date: Fri, 14 Sep 2012 01:32:41 +0200 Subject: [PATCH] carl9170 firmware: extract tx and rx code from wlan.c into separate files Signed-off-by: Christian Lamparter --- carlfw/CMakeLists.txt | 3 +- carlfw/include/wl.h | 10 +- carlfw/src/wlan.c | 787 +----------------------------------------- carlfw/src/wlanrx.c | 174 ++++++++++ carlfw/src/wlantx.c | 679 ++++++++++++++++++++++++++++++++++++ 5 files changed, 867 insertions(+), 786 deletions(-) create mode 100644 carlfw/src/wlanrx.c create mode 100644 carlfw/src/wlantx.c diff --git a/carlfw/CMakeLists.txt b/carlfw/CMakeLists.txt index 2a87dc0..fe68572 100644 --- a/carlfw/CMakeLists.txt +++ b/carlfw/CMakeLists.txt @@ -16,7 +16,8 @@ set(CARLFW_CFLAGS "${CARLFW_CFLAGS_DEF} ${CARLFW_CFLAGS_EXTRA} ${CARLFW_CFLAGS_A include_directories (../include/linux ../include/shared ../include include) -set(carl9170_main_src src/main.c src/wlan.c src/fw.c src/gpio.c src/timer.c +set(carl9170_main_src src/main.c src/wlan.c src/wlanrx.c src/wlantx.c + src/fw.c src/gpio.c src/timer.c src/uart.c src/dma.c src/hostif.c src/reboot.S src/printf.c src/rf.c src/cam.c src/wol.c) diff --git a/carlfw/include/wl.h b/carlfw/include/wl.h index dd5b0a8..50fee61 100644 --- a/carlfw/include/wl.h +++ b/carlfw/include/wl.h @@ -1,7 +1,7 @@ /* * carl9170 firmware - used by the ar9170 wireless device * - * WLAN + * shared WLAN functions, interfaces and definitions * * Copyright (c) 2000-2005 ZyDAS Technology Corporation * Copyright (c) 2007-2009 Atheros Communications, Inc. @@ -269,6 +269,14 @@ void wlan_tx_fw(struct carl9170_tx_superdesc *super, fw_desc_callback_t cb); void wlan_timer(void); void handle_wlan(void); +void handle_wlan_rx(void); + +void wlan_send_buffered_tx_status(void); +void wlan_send_buffered_cab(void); +void wlan_send_buffered_ba(void); +void handle_wlan_tx_completion(void); +void wlan_dma_bump(unsigned int qidx); + void wlan_cab_flush_queue(const unsigned int vif); void wlan_modify_beacon(const unsigned int vif, const unsigned int bcn_addr, diff --git a/carlfw/src/wlan.c b/carlfw/src/wlan.c index 3d879bd..0f4dfeb 100644 --- a/carlfw/src/wlan.c +++ b/carlfw/src/wlan.c @@ -6,7 +6,7 @@ * Copyright (c) 2000-2005 ZyDAS Technology Corporation * Copyright (c) 2007-2009 Atheros Communications, Inc. * Copyright 2009 Johannes Berg - * Copyright 2009-2011 Christian Lamparter + * Copyright 2009-2012 Christian Lamparter * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -33,44 +33,6 @@ #include "linux/ieee80211.h" #include "wol.h" -static void wlan_txunstuck(unsigned int queue) -{ - set_wlan_txq_dma_addr(queue, ((uint32_t) fw.wlan.tx_queue[queue].head) | 1); -} - -#ifdef CONFIG_CARL9170FW_DMA_QUEUE_BUMP -static void wlan_txupdate(unsigned int queue) -{ - set_wlan_txq_dma_addr(queue, ((uint32_t) fw.wlan.tx_queue[queue].head)); -} - -static void wlan_dma_bump(unsigned int qidx) -{ - unsigned int offset = qidx; - uint32_t status, trigger; - - status = get(AR9170_MAC_REG_DMA_STATUS) >> 12; - trigger = get(AR9170_MAC_REG_DMA_TRIGGER) >> 12; - - while (offset != 0) { - status >>= 4; - trigger >>= 4; - offset--; - } - - status &= 0xf; - trigger &= 0xf; - - if ((trigger == 0xa) && (status == 0x8)) { - DBG("UNSTUCK"); - wlan_txunstuck(qidx); - } else { - DBG("UPDATE"); - wlan_txupdate(qidx); - } -} -#endif /* CONFIG_CARL9170FW_DMA_QUEUE_BUMP */ - #ifdef CONFIG_CARL9170FW_DEBUG static void wlan_dump_queue(unsigned int qidx) { @@ -109,541 +71,6 @@ static void wlan_dump_queue(unsigned int qidx) } #endif /* CONFIG_CARL9170FW_DEBUG */ -static void wlan_send_buffered_tx_status(void) -{ - unsigned int len; - - while (fw.wlan.tx_status_pending) { - len = min((unsigned int)fw.wlan.tx_status_pending, - CARL9170_RSP_TX_STATUS_NUM); - len = min(len, CARL9170_TX_STATUS_NUM - fw.wlan.tx_status_head_idx); - - /* - * rather than memcpy each individual request into a large buffer, - * we _splice_ them all together. - * - * The only downside is however that we have to be careful around - * the edges of the tx_status_cache. - * - * Note: - * Each tx_status is about 2 bytes. However every command package - * must have a size which is a multiple of 4. - */ - - send_cmd_to_host((len * sizeof(struct carl9170_tx_status) + 3) & ~3, - CARL9170_RSP_TXCOMP, len, (void *) - &fw.wlan.tx_status_cache[fw.wlan.tx_status_head_idx]); - - fw.wlan.tx_status_pending -= len; - fw.wlan.tx_status_head_idx += len; - fw.wlan.tx_status_head_idx %= CARL9170_TX_STATUS_NUM; - } -} - -static struct carl9170_tx_status *wlan_get_tx_status_buffer(void) -{ - struct carl9170_tx_status *tmp; - - tmp = &fw.wlan.tx_status_cache[fw.wlan.tx_status_tail_idx++]; - fw.wlan.tx_status_tail_idx %= CARL9170_TX_STATUS_NUM; - - if (fw.wlan.tx_status_pending == CARL9170_TX_STATUS_NUM) - wlan_send_buffered_tx_status(); - - fw.wlan.tx_status_pending++; - - return tmp; -} - -/* generate _aggregated_ tx_status for the host */ -void wlan_tx_complete(struct carl9170_tx_superframe *super, - bool txs) -{ - struct carl9170_tx_status *status; - - status = wlan_get_tx_status_buffer(); - - /* - * The *unique* cookie and AC_ID is used by the driver for - * frame lookup. - */ - status->cookie = super->s.cookie; - status->queue = super->s.queue; - super->s.cookie = 0; - - /* - * This field holds the number of tries of the rate in - * the rate index field (rix). - */ - status->rix = super->s.rix; - status->tries = super->s.cnt; - status->success = (txs) ? 1 : 0; -} - -static bool wlan_tx_consume_retry(struct carl9170_tx_superframe *super) -{ - /* check if this was the last possible retry with this rate */ - if (unlikely(super->s.cnt >= super->s.ri[super->s.rix].tries)) { - /* end of the road - indicate tx failure */ - if (unlikely(super->s.rix == CARL9170_TX_MAX_RETRY_RATES)) - return false; - - /* check if there are alternative rates available */ - if (!super->s.rr[super->s.rix].set) - return false; - - /* try next retry rate */ - super->f.hdr.phy.set = super->s.rr[super->s.rix].set; - - /* finally - mark the old rate as USED */ - super->s.rix++; - - /* update MAC flags */ - super->f.hdr.mac.erp_prot = super->s.ri[super->s.rix].erp_prot; - super->f.hdr.mac.ampdu = super->s.ri[super->s.rix].ampdu; - - /* reinitialize try counter */ - super->s.cnt = 1; - } else { - /* just increase retry counter */ - super->s.cnt++; - } - - return true; -} - -static inline u16 get_tid(struct ieee80211_hdr *hdr) -{ - return (ieee80211_get_qos_ctl(hdr))[0] & IEEE80211_QOS_CTL_TID_MASK; -} - -/* This function will only work on uint32_t-aligned pointers! */ -static bool same_hdr(const void *_d0, const void *_d1) -{ - const uint32_t *d0 = _d0; - const uint32_t *d1 = _d1; - - /* BUG_ON((unsigned long)d0 & 3 || (unsigned long)d1 & 3)) */ - return !((d0[0] ^ d1[0]) | /* FC + DU */ - (d0[1] ^ d1[1]) | /* addr1 */ - (d0[2] ^ d1[2]) | (d0[3] ^ d1[3]) | /* addr2 + addr3 */ - (d0[4] ^ d1[4])); /* addr3 */ -} - -static inline bool same_aggr(struct ieee80211_hdr *a, struct ieee80211_hdr *b) -{ - return (get_tid(a) == get_tid(b)) || same_hdr(a, b); -} - -static void wlan_tx_ampdu_reset(unsigned int qidx) -{ - fw.wlan.ampdu_prev[qidx] = NULL; -} - -static void wlan_tx_ampdu_end(unsigned int qidx) -{ - struct carl9170_tx_superframe *ht_prev = fw.wlan.ampdu_prev[qidx]; - - if (ht_prev) - ht_prev->f.hdr.mac.ba_end = 1; - - wlan_tx_ampdu_reset(qidx); -} - -static void wlan_tx_ampdu(struct carl9170_tx_superframe *super) -{ - unsigned int qidx = super->s.queue; - struct carl9170_tx_superframe *ht_prev = fw.wlan.ampdu_prev[qidx]; - - if (super->f.hdr.mac.ampdu) { - if (ht_prev && - !same_aggr(&super->f.data.i3e, &ht_prev->f.data.i3e)) - ht_prev->f.hdr.mac.ba_end = 1; - else - super->f.hdr.mac.ba_end = 0; - - fw.wlan.ampdu_prev[qidx] = super; - } else { - wlan_tx_ampdu_end(qidx); - } -} - -/* for all tries */ -static void __wlan_tx(struct dma_desc *desc) -{ - struct carl9170_tx_superframe *super = get_super(desc); - - if (unlikely(super->s.fill_in_tsf)) { - struct ieee80211_mgmt *mgmt = (void *) &super->f.data.i3e; - uint32_t *tsf = (uint32_t *) &mgmt->u.probe_resp.timestamp; - - /* - * Truth be told: this is a hack. - * - * The *real* TSF is definitely going to be higher/older. - * But this hardware emulation code is head and shoulders - * above anything a driver can possibly do. - * - * (even, if it's got an accurate atomic clock source). - */ - - read_tsf(tsf); - } - - wlan_tx_ampdu(super); - -#ifdef CONFIG_CARL9170FW_DEBUG - BUG_ON(fw.phy.psm.state != CARL9170_PSM_WAKE); -#endif /* CONFIG_CARL9170FW_DEBUG */ - - /* insert desc into the right queue */ - dma_put(&fw.wlan.tx_queue[super->s.queue], desc); -} - -static void wlan_assign_seq(struct ieee80211_hdr *hdr, unsigned int vif) -{ - hdr->seq_ctrl &= cpu_to_le16(~IEEE80211_SCTL_SEQ); - hdr->seq_ctrl |= cpu_to_le16(fw.wlan.sequence[vif]); - - if (ieee80211_is_first_frag(hdr->seq_ctrl)) - fw.wlan.sequence[vif] += 0x10; -} - -/* prepares frame for the first transmission */ -static void _wlan_tx(struct dma_desc *desc) -{ - struct carl9170_tx_superframe *super = get_super(desc); - - if (unlikely(super->s.assign_seq)) - wlan_assign_seq(&super->f.data.i3e, super->s.vif_id); - - if (unlikely(super->s.ampdu_commit_density)) { - set(AR9170_MAC_REG_AMPDU_DENSITY, - MOD_VAL(AR9170_MAC_AMPDU_DENSITY, - get(AR9170_MAC_REG_AMPDU_DENSITY), - super->s.ampdu_density)); - } - - if (unlikely(super->s.ampdu_commit_factor)) { - set(AR9170_MAC_REG_AMPDU_FACTOR, - MOD_VAL(AR9170_MAC_AMPDU_FACTOR, - get(AR9170_MAC_REG_AMPDU_FACTOR), - 8 << super->s.ampdu_factor)); - } -} - -/* propagate transmission status back to the driver */ -static bool wlan_tx_status(struct dma_queue *queue, - struct dma_desc *desc) -{ - struct carl9170_tx_superframe *super = get_super(desc); - unsigned int qidx = super->s.queue; - bool txfail = false, success; - - success = true; - - /* update hangcheck */ - fw.wlan.last_super_num[qidx] = 0; - - /* - * Note: - * There could be a corner case when the TXFAIL is set - * even though the frame was properly ACKed by the peer: - * a BlockAckReq with the immediate policy will cause - * the receiving peer to produce a BlockACK unfortunately - * the MAC in this chip seems to be expecting a legacy - * ACK and marks the BAR as failed! - */ - - if (!!(desc->ctrl & AR9170_CTRL_FAIL)) { - txfail = !!(desc->ctrl & AR9170_CTRL_TXFAIL); - - /* reset retry indicator flags */ - desc->ctrl &= ~(AR9170_CTRL_TXFAIL | AR9170_CTRL_BAFAIL); - - /* - * Note: wlan_tx_consume_retry will override the old - * phy [CCK,OFDM, HT, BW20/40, MCS...] and mac vectors - * [AMPDU,RTS/CTS,...] therefore be careful when they - * are used. - */ - if (wlan_tx_consume_retry(super)) { - /* - * retry for simple and aggregated 802.11 frames. - * - * Note: We must not mess up the original frame - * order. - */ - - if (!super->f.hdr.mac.ampdu) { - /* - * 802.11 - 7.1.3.1.5. - * set "Retry Field" for consecutive attempts - * - * Note: For AMPDU see: - * 802.11n 9.9.1.6 "Retransmit Procedures" - */ - super->f.data.i3e.frame_control |= - cpu_to_le16(IEEE80211_FCTL_RETRY); - } - - if (txfail) { - /* Normal TX Failure */ - - /* demise descriptor ownership back to the hardware */ - dma_rearm(desc); - - /* - * And this will get the queue going again. - * To understand why: you have to get the HW - * specs... But sadly I never saw them. - */ - wlan_txunstuck(qidx); - - /* abort cycle - this is necessary due to HW design */ - return false; - } else { - /* (HT-) BlockACK failure */ - - /* - * Unlink the failed attempt and put it into - * the retry queue. The caller routine must - * be aware of this so the frames don't get lost. - */ - -#ifndef CONFIG_CARL9170FW_DEBUG - dma_unlink_head(queue); -#else /* CONFIG_CARL9170FW_DEBUG */ - BUG_ON(dma_unlink_head(queue) != desc); -#endif /* CONFIG_CARL9170FW_DEBUG */ - dma_put(&fw.wlan.tx_retry, desc); - return true; - } - } else { - /* out of frame attempts - discard frame */ - success = false; - } - } - -#ifndef CONFIG_CARL9170FW_DEBUG - dma_unlink_head(queue); -#else /* CONFIG_CARL9170FW_DEBUG */ - BUG_ON(dma_unlink_head(queue) != desc); -#endif /* CONFIG_CARL9170FW_DEBUG */ - if (txfail) { - /* - * Issue the queue bump, - * We need to do this in case this was the frame's last - * possible retry attempt and it unfortunately: it failed. - */ - - wlan_txunstuck(qidx); - } - - unhide_super(desc); - - if (unlikely(super == fw.wlan.fw_desc_data)) { - fw.wlan.fw_desc = desc; - fw.wlan.fw_desc_available = 1; - - if (fw.wlan.fw_desc_callback) - fw.wlan.fw_desc_callback(super, success); - - return true; - } - - if (unlikely(super->s.cab)) - fw.wlan.cab_queue_len[super->s.vif_id]--; - - wlan_tx_complete(super, success); - - if (ieee80211_is_back_req(super->f.data.i3e.frame_control)) { - fw.wlan.queued_bar--; - } - - /* recycle freed descriptors */ - dma_reclaim(&fw.pta.down_queue, desc); - down_trigger(); - return true; -} - -static void handle_tx_completion(void) -{ - struct dma_desc *desc; - int i; - - for (i = AR9170_TXQ_SPECIAL; i >= AR9170_TXQ0; i--) { - __while_desc_bits(desc, &fw.wlan.tx_queue[i], AR9170_OWN_BITS_SW) { - if (!wlan_tx_status(&fw.wlan.tx_queue[i], desc)) { - /* termination requested. */ - break; - } - } - - wlan_tx_ampdu_reset(i); - - for_each_desc(desc, &fw.wlan.tx_retry) - __wlan_tx(desc); - - wlan_tx_ampdu_end(i); - if (!queue_empty(&fw.wlan.tx_queue[i])) - wlan_trigger(BIT(i)); - } -} - -void __hot wlan_tx(struct dma_desc *desc) -{ - struct carl9170_tx_superframe *super = DESC_PAYLOAD(desc); - - if (ieee80211_is_back_req(super->f.data.i3e.frame_control)) { - fw.wlan.queued_bar++; - } - - /* initialize rate control struct */ - super->s.rix = 0; - super->s.cnt = 1; - hide_super(desc); - - if (unlikely(super->s.cab)) { - fw.wlan.cab_queue_len[super->s.vif_id]++; - dma_put(&fw.wlan.cab_queue[super->s.vif_id], desc); - return; - } - - _wlan_tx(desc); - __wlan_tx(desc); - wlan_trigger(BIT(super->s.queue)); -} - -void wlan_tx_fw(struct carl9170_tx_superdesc *super, fw_desc_callback_t cb) -{ - if (!fw.wlan.fw_desc_available) - return; - - fw.wlan.fw_desc_available = 0; - - /* Format BlockAck */ - fw.wlan.fw_desc->ctrl = AR9170_CTRL_FS_BIT | AR9170_CTRL_LS_BIT; - fw.wlan.fw_desc->status = AR9170_OWN_BITS_SW; - - fw.wlan.fw_desc->totalLen = fw.wlan.fw_desc->dataSize = super->len; - fw.wlan.fw_desc_data = fw.wlan.fw_desc->dataAddr = super; - fw.wlan.fw_desc->nextAddr = fw.wlan.fw_desc->lastAddr = - fw.wlan.fw_desc; - fw.wlan.fw_desc_callback = cb; - wlan_tx(fw.wlan.fw_desc); -} - -static void wlan_send_buffered_ba(void) -{ - struct carl9170_tx_ba_superframe *baf = &dma_mem.reserved.ba.ba; - struct ieee80211_ba *ba = (struct ieee80211_ba *) &baf->f.ba; - struct carl9170_bar_ctx *ctx; - - if (likely(!fw.wlan.queued_ba)) - return; - - /* there's no point to continue when the ba_desc is not available. */ - if (!fw.wlan.fw_desc_available) - return; - - ctx = &fw.wlan.ba_cache[fw.wlan.ba_head_idx]; - fw.wlan.ba_head_idx++; - fw.wlan.ba_head_idx %= CONFIG_CARL9170FW_BACK_REQS_NUM; - fw.wlan.queued_ba--; - - baf->s.len = sizeof(struct carl9170_tx_superdesc) + - sizeof(struct ar9170_tx_hwdesc) + - sizeof(struct ieee80211_ba); - baf->s.ri[0].tries = 1; - baf->s.cookie = 0; - baf->s.queue = AR9170_TXQ_VO; - baf->f.hdr.length = sizeof(struct ieee80211_ba) + FCS_LEN; - - baf->f.hdr.mac.no_ack = 1; - - baf->f.hdr.phy.modulation = 1; /* OFDM */ - baf->f.hdr.phy.tx_power = 34; /* 17 dBm */ - baf->f.hdr.phy.chains = 1; - baf->f.hdr.phy.mcs = AR9170_TXRX_PHY_RATE_OFDM_6M; - - /* format outgoing BA */ - ba->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_BACK); - ba->duration = cpu_to_le16(0); - - /* the BAR contains all necessary MACs. All we need is to swap them */ - memcpy(ba->ra, ctx->ta, 6); - memcpy(ba->ta, ctx->ra, 6); - - /* - * Unfortunately, we cannot look into the hardware's scoreboard. - * Therefore we have to proceed as described in 802.11n 9.10.7.5 - * and send a null BlockAck. - */ - memset(ba->bitmap, 0x0, sizeof(ba->bitmap)); - - /* - * Both, the original firmare and ath9k set the NO ACK flag in - * the BA Ack Policy subfield. - */ - ba->control = ctx->control | cpu_to_le16(1); - ba->start_seq_num = ctx->start_seq_num; - wlan_tx_fw(&baf->s, NULL); -} - -static struct carl9170_bar_ctx *wlan_get_bar_cache_buffer(void) -{ - struct carl9170_bar_ctx *tmp; - - tmp = &fw.wlan.ba_cache[fw.wlan.ba_tail_idx]; - fw.wlan.ba_tail_idx++; - fw.wlan.ba_tail_idx %= CONFIG_CARL9170FW_BACK_REQS_NUM; - if (fw.wlan.queued_ba < CONFIG_CARL9170FW_BACK_REQS_NUM) - fw.wlan.queued_ba++; - - return tmp; -} - -static void handle_bar(struct dma_desc *desc __unused, struct ieee80211_hdr *hdr, - unsigned int len, unsigned int mac_err) -{ - struct ieee80211_bar *bar; - struct carl9170_bar_ctx *ctx; - - if (unlikely(mac_err)) { - /* - * This check does a number of things: - * 1. checks if the frame is in good nick - * 2. checks if the RA (MAC) matches - */ - return ; - } - - if (unlikely(len < (sizeof(struct ieee80211_bar) + FCS_LEN))) { - /* - * Sneaky, corrupted BARs... but not with us! - */ - - return ; - } - - bar = (void *) hdr; - - if ((bar->control & cpu_to_le16(IEEE80211_BAR_CTRL_MULTI_TID)) || - !(bar->control & cpu_to_le16(IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA))) { - /* not implemented yet */ - - return ; - } - - ctx = wlan_get_bar_cache_buffer(); - - memcpy(ctx->ra, bar->ra, 6); - memcpy(ctx->ta, bar->ta, 6); - ctx->control = bar->control; - ctx->start_seq_num = bar->start_seq_num; -} - static void wlan_check_rx_overrun(void) { uint32_t overruns, total; @@ -660,214 +87,6 @@ static void wlan_check_rx_overrun(void) } } -static unsigned int wlan_rx_filter(struct dma_desc *desc) -{ - struct ieee80211_hdr *hdr; - unsigned int data_len; - unsigned int rx_filter; - unsigned int mac_err; - - data_len = ar9170_get_rx_mpdu_len(desc); - mac_err = ar9170_get_rx_macstatus_error(desc); - -#define AR9170_RX_ERROR_BAD (AR9170_RX_ERROR_FCS | AR9170_RX_ERROR_PLCP) - - if (unlikely(data_len < (4 + 6 + FCS_LEN) || - desc->totalLen > CONFIG_CARL9170FW_RX_FRAME_LEN) || - mac_err & AR9170_RX_ERROR_BAD) { - /* - * This frame is too damaged to do anything - * useful with it. - */ - - return CARL9170_RX_FILTER_BAD; - } - - rx_filter = 0; - if (mac_err & AR9170_RX_ERROR_WRONG_RA) - rx_filter |= CARL9170_RX_FILTER_OTHER_RA; - - if (mac_err & AR9170_RX_ERROR_DECRYPT) - rx_filter |= CARL9170_RX_FILTER_DECRY_FAIL; - - hdr = ar9170_get_rx_i3e(desc); - if (likely(ieee80211_is_data(hdr->frame_control))) { - rx_filter |= CARL9170_RX_FILTER_DATA; - } else if (ieee80211_is_ctl(hdr->frame_control)) { - switch (le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_STYPE) { - case IEEE80211_STYPE_BACK_REQ: - handle_bar(desc, hdr, data_len, mac_err); - rx_filter |= CARL9170_RX_FILTER_CTL_BACKR; - break; - case IEEE80211_STYPE_PSPOLL: - rx_filter |= CARL9170_RX_FILTER_CTL_PSPOLL; - break; - case IEEE80211_STYPE_BACK: - if (fw.wlan.queued_bar) { - /* - * Don't filter block acks when the application - * has queued BARs. This is because the firmware - * can't do the accouting and the application - * has to sort out if the BA belongs to any BARs. - */ - break; - } - /* otherwise fall through */ - default: - rx_filter |= CARL9170_RX_FILTER_CTL_OTHER; - break; - } - } else { - /* ieee80211_is_mgmt */ - rx_filter |= CARL9170_RX_FILTER_MGMT; - } - - if (unlikely(fw.suspend_mode == CARL9170_HOST_SUSPENDED)) { - wol_rx(rx_filter, hdr, min(data_len, - (unsigned int)AR9170_BLOCK_SIZE)); - } - -#undef AR9170_RX_ERROR_BAD - - return rx_filter; -} - -static void handle_rx(void) -{ - struct dma_desc *desc; - - for_each_desc_not_bits(desc, &fw.wlan.rx_queue, AR9170_OWN_BITS_HW) { - if (!(wlan_rx_filter(desc) & fw.wlan.rx_filter)) { - dma_put(&fw.pta.up_queue, desc); - up_trigger(); - } else { - dma_reclaim(&fw.wlan.rx_queue, desc); - wlan_trigger(AR9170_DMA_TRIGGER_RXQ); - } - } -} - -void wlan_cab_flush_queue(const unsigned int vif) -{ - struct dma_queue *cab_queue = &fw.wlan.cab_queue[vif]; - struct dma_desc *desc; - - /* move queued frames into the main tx queues */ - for_each_desc(desc, cab_queue) { - struct carl9170_tx_superframe *super = get_super(desc); - if (!queue_empty(cab_queue)) { - /* - * Set MOREDATA flag for all, - * but the last queued frame. - * see: 802.11-2007 11.2.1.5 f) - * - * This is actually the reason to why - * we need to prevent the reentry. - */ - - super->f.data.i3e.frame_control |= - cpu_to_le16(IEEE80211_FCTL_MOREDATA); - } else { - super->f.data.i3e.frame_control &= - cpu_to_le16(~IEEE80211_FCTL_MOREDATA); - } - - /* ready to roll! */ - _wlan_tx(desc); - __wlan_tx(desc); - wlan_trigger(BIT(super->s.queue)); - } -} - -static uint8_t *beacon_find_ie(uint8_t ie, void *addr, - const unsigned int len) -{ - struct ieee80211_mgmt *mgmt = addr; - uint8_t *pos, *end; - - pos = mgmt->u.beacon.variable; - end = (uint8_t *) ((unsigned long)mgmt + (len - FCS_LEN)); - while (pos < end) { - if (pos + 2 + pos[1] > end) - return NULL; - - if (pos[0] == ie) - return pos; - - pos += pos[1] + 2; - } - - return NULL; -} - -void wlan_modify_beacon(const unsigned int vif, - const unsigned int addr, const unsigned int len) -{ - uint8_t *_ie; - struct ieee80211_tim_ie *ie; - - _ie = beacon_find_ie(WLAN_EID_TIM, (void *)addr, len); - if (likely(_ie)) { - ie = (struct ieee80211_tim_ie *) &_ie[2]; - - if (!queue_empty(&fw.wlan.cab_queue[vif]) && (ie->dtim_count == 0)) { - /* schedule DTIM transfer */ - fw.wlan.cab_flush_trigger[vif] = CARL9170_CAB_TRIGGER_ARMED; - } else if ((fw.wlan.cab_queue_len[vif] == 0) && (fw.wlan.cab_flush_trigger[vif])) { - /* undo all chances to the beacon structure */ - ie->bitmap_ctrl &= ~0x1; - fw.wlan.cab_flush_trigger[vif] = CARL9170_CAB_TRIGGER_EMPTY; - } - - /* Triggered by CARL9170_CAB_TRIGGER_ARMED || CARL9170_CAB_TRIGGER_DEFER */ - if (fw.wlan.cab_flush_trigger[vif]) { - /* Set the almighty Multicast Traffic Indication Bit. */ - ie->bitmap_ctrl |= 0x1; - } - } - - /* - * Ideally, the sequence number should be assigned by the TX arbiter - * hardware. But AFAIK that's not possible, so we have to go for the - * next best thing and write it into the beacon fifo during the open - * beacon update window. - */ - - wlan_assign_seq((struct ieee80211_hdr *)addr, vif); -} - -static void wlan_send_buffered_cab(void) -{ - unsigned int i; - - for (i = 0; i < CARL9170_INTF_NUM; i++) { - if (unlikely(fw.wlan.cab_flush_trigger[i] == CARL9170_CAB_TRIGGER_ARMED)) { - /* - * This is hardcoded into carl9170usb driver. - * - * The driver must set the PRETBTT event to beacon_interval - - * CARL9170_PRETBTT_KUS (usually 6) Kus. - * - * But still, we can only do so much about 802.11-2007 9.3.2.1 & - * 11.2.1.6. Let's hope the current solution is adequate enough. - */ - - if (is_after_msecs(fw.wlan.cab_flush_time, (CARL9170_TBTT_DELTA))) { - wlan_cab_flush_queue(i); - - /* - * This prevents the code from sending new BC/MC frames - * which were queued after the previous buffered traffic - * has been sent out... They will have to wait until the - * next DTIM beacon comes along. - */ - fw.wlan.cab_flush_trigger[i] = CARL9170_CAB_TRIGGER_DEFER; - } - } - - } -} - static void handle_beacon_config(void) { uint32_t bcn_count; @@ -943,10 +162,10 @@ void handle_wlan(void) HANDLER(intr, AR9170_MAC_INT_ATIM, handle_atim); - HANDLER(intr, AR9170_MAC_INT_RXC, handle_rx); + HANDLER(intr, AR9170_MAC_INT_RXC, handle_wlan_rx); HANDLER(intr, (AR9170_MAC_INT_TXC | AR9170_MAC_INT_RETRY_FAIL), - handle_tx_completion); + handle_wlan_tx_completion); #ifdef CONFIG_CARL9170FW_DEBUG HANDLER(intr, AR9170_MAC_INT_QOS, handle_qos); diff --git a/carlfw/src/wlanrx.c b/carlfw/src/wlanrx.c new file mode 100644 index 0000000..02cbce5 --- /dev/null +++ b/carlfw/src/wlanrx.c @@ -0,0 +1,174 @@ +/* + * carl9170 firmware - used by the ar9170 wireless device + * + * WLAN receive routines + * + * Copyright (c) 2000-2005 ZyDAS Technology Corporation + * Copyright (c) 2007-2009 Atheros Communications, Inc. + * Copyright 2009 Johannes Berg + * Copyright 2009-2012 Christian Lamparter + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include "carl9170.h" +#include "shared/phy.h" +#include "hostif.h" +#include "timer.h" +#include "wl.h" +#include "printf.h" +#include "rf.h" +#include "linux/ieee80211.h" +#include "wol.h" + +static struct carl9170_bar_ctx *wlan_get_bar_cache_buffer(void) +{ + struct carl9170_bar_ctx *tmp; + + tmp = &fw.wlan.ba_cache[fw.wlan.ba_tail_idx]; + fw.wlan.ba_tail_idx++; + fw.wlan.ba_tail_idx %= CONFIG_CARL9170FW_BACK_REQS_NUM; + if (fw.wlan.queued_ba < CONFIG_CARL9170FW_BACK_REQS_NUM) + fw.wlan.queued_ba++; + + return tmp; +} + +static void handle_bar(struct dma_desc *desc __unused, struct ieee80211_hdr *hdr, + unsigned int len, unsigned int mac_err) +{ + struct ieee80211_bar *bar; + struct carl9170_bar_ctx *ctx; + + if (unlikely(mac_err)) { + /* + * This check does a number of things: + * 1. checks if the frame is in good nick + * 2. checks if the RA (MAC) matches + */ + return ; + } + + if (unlikely(len < (sizeof(struct ieee80211_bar) + FCS_LEN))) { + /* + * Sneaky, corrupted BARs... but not with us! + */ + + return ; + } + + bar = (void *) hdr; + + if ((bar->control & cpu_to_le16(IEEE80211_BAR_CTRL_MULTI_TID)) || + !(bar->control & cpu_to_le16(IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA))) { + /* not implemented yet */ + + return ; + } + + ctx = wlan_get_bar_cache_buffer(); + + memcpy(ctx->ra, bar->ra, 6); + memcpy(ctx->ta, bar->ta, 6); + ctx->control = bar->control; + ctx->start_seq_num = bar->start_seq_num; +} + +static unsigned int wlan_rx_filter(struct dma_desc *desc) +{ + struct ieee80211_hdr *hdr; + unsigned int data_len; + unsigned int rx_filter; + unsigned int mac_err; + + data_len = ar9170_get_rx_mpdu_len(desc); + mac_err = ar9170_get_rx_macstatus_error(desc); + +#define AR9170_RX_ERROR_BAD (AR9170_RX_ERROR_FCS | AR9170_RX_ERROR_PLCP) + + if (unlikely(data_len < (4 + 6 + FCS_LEN) || + desc->totalLen > CONFIG_CARL9170FW_RX_FRAME_LEN) || + mac_err & AR9170_RX_ERROR_BAD) { + /* + * This frame is too damaged to do anything + * useful with it. + */ + + return CARL9170_RX_FILTER_BAD; + } + + rx_filter = 0; + if (mac_err & AR9170_RX_ERROR_WRONG_RA) + rx_filter |= CARL9170_RX_FILTER_OTHER_RA; + + if (mac_err & AR9170_RX_ERROR_DECRYPT) + rx_filter |= CARL9170_RX_FILTER_DECRY_FAIL; + + hdr = ar9170_get_rx_i3e(desc); + if (likely(ieee80211_is_data(hdr->frame_control))) { + rx_filter |= CARL9170_RX_FILTER_DATA; + } else if (ieee80211_is_ctl(hdr->frame_control)) { + switch (le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_STYPE) { + case IEEE80211_STYPE_BACK_REQ: + handle_bar(desc, hdr, data_len, mac_err); + rx_filter |= CARL9170_RX_FILTER_CTL_BACKR; + break; + case IEEE80211_STYPE_PSPOLL: + rx_filter |= CARL9170_RX_FILTER_CTL_PSPOLL; + break; + case IEEE80211_STYPE_BACK: + if (fw.wlan.queued_bar) { + /* + * Don't filter block acks when the application + * has queued BARs. This is because the firmware + * can't do the accouting and the application + * has to sort out if the BA belongs to any BARs. + */ + break; + } + /* otherwise fall through */ + default: + rx_filter |= CARL9170_RX_FILTER_CTL_OTHER; + break; + } + } else { + /* ieee80211_is_mgmt */ + rx_filter |= CARL9170_RX_FILTER_MGMT; + } + + if (unlikely(fw.suspend_mode == CARL9170_HOST_SUSPENDED)) { + wol_rx(rx_filter, hdr, min(data_len, + (unsigned int)AR9170_BLOCK_SIZE)); + } + +#undef AR9170_RX_ERROR_BAD + + return rx_filter; +} + +void handle_wlan_rx(void) +{ + struct dma_desc *desc; + + for_each_desc_not_bits(desc, &fw.wlan.rx_queue, AR9170_OWN_BITS_HW) { + if (!(wlan_rx_filter(desc) & fw.wlan.rx_filter)) { + dma_put(&fw.pta.up_queue, desc); + up_trigger(); + } else { + dma_reclaim(&fw.wlan.rx_queue, desc); + wlan_trigger(AR9170_DMA_TRIGGER_RXQ); + } + } +} diff --git a/carlfw/src/wlantx.c b/carlfw/src/wlantx.c new file mode 100644 index 0000000..9f2f51b --- /dev/null +++ b/carlfw/src/wlantx.c @@ -0,0 +1,679 @@ +/* + * carl9170 firmware - used by the ar9170 wireless device + * + * WLAN transmit and tx status + * + * Copyright (c) 2000-2005 ZyDAS Technology Corporation + * Copyright (c) 2007-2009 Atheros Communications, Inc. + * Copyright 2009 Johannes Berg + * Copyright 2009-2012 Christian Lamparter + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include "carl9170.h" +#include "shared/phy.h" +#include "hostif.h" +#include "timer.h" +#include "wl.h" +#include "printf.h" +#include "rf.h" +#include "linux/ieee80211.h" +#include "wol.h" + +static void wlan_txunstuck(unsigned int queue) +{ + set_wlan_txq_dma_addr(queue, ((uint32_t) fw.wlan.tx_queue[queue].head) | 1); +} + +#ifdef CONFIG_CARL9170FW_DMA_QUEUE_BUMP +static void wlan_txupdate(unsigned int queue) +{ + set_wlan_txq_dma_addr(queue, ((uint32_t) fw.wlan.tx_queue[queue].head)); +} + +void wlan_dma_bump(unsigned int qidx) +{ + unsigned int offset = qidx; + uint32_t status, trigger; + + status = get(AR9170_MAC_REG_DMA_STATUS) >> 12; + trigger = get(AR9170_MAC_REG_DMA_TRIGGER) >> 12; + + while (offset != 0) { + status >>= 4; + trigger >>= 4; + offset--; + } + + status &= 0xf; + trigger &= 0xf; + + if ((trigger == 0xa) && (status == 0x8)) { + DBG("UNSTUCK"); + wlan_txunstuck(qidx); + } else { + DBG("UPDATE"); + wlan_txupdate(qidx); + } +} +#else +void wlan_dma_bump(unsigned int __unused qidx) +{ +} +#endif /* CONFIG_CARL9170FW_DMA_QUEUE_BUMP */ + +void wlan_send_buffered_tx_status(void) +{ + unsigned int len; + + while (fw.wlan.tx_status_pending) { + len = min((unsigned int)fw.wlan.tx_status_pending, + CARL9170_RSP_TX_STATUS_NUM); + len = min(len, CARL9170_TX_STATUS_NUM - fw.wlan.tx_status_head_idx); + + /* + * rather than memcpy each individual request into a large buffer, + * we _splice_ them all together. + * + * The only downside is however that we have to be careful around + * the edges of the tx_status_cache. + * + * Note: + * Each tx_status is about 2 bytes. However every command package + * must have a size which is a multiple of 4. + */ + + send_cmd_to_host((len * sizeof(struct carl9170_tx_status) + 3) & ~3, + CARL9170_RSP_TXCOMP, len, (void *) + &fw.wlan.tx_status_cache[fw.wlan.tx_status_head_idx]); + + fw.wlan.tx_status_pending -= len; + fw.wlan.tx_status_head_idx += len; + fw.wlan.tx_status_head_idx %= CARL9170_TX_STATUS_NUM; + } +} + +static struct carl9170_tx_status *wlan_get_tx_status_buffer(void) +{ + struct carl9170_tx_status *tmp; + + tmp = &fw.wlan.tx_status_cache[fw.wlan.tx_status_tail_idx++]; + fw.wlan.tx_status_tail_idx %= CARL9170_TX_STATUS_NUM; + + if (fw.wlan.tx_status_pending == CARL9170_TX_STATUS_NUM) + wlan_send_buffered_tx_status(); + + fw.wlan.tx_status_pending++; + + return tmp; +} + +/* generate _aggregated_ tx_status for the host */ +void wlan_tx_complete(struct carl9170_tx_superframe *super, + bool txs) +{ + struct carl9170_tx_status *status; + + status = wlan_get_tx_status_buffer(); + + /* + * The *unique* cookie and AC_ID is used by the driver for + * frame lookup. + */ + status->cookie = super->s.cookie; + status->queue = super->s.queue; + super->s.cookie = 0; + + /* + * This field holds the number of tries of the rate in + * the rate index field (rix). + */ + status->rix = super->s.rix; + status->tries = super->s.cnt; + status->success = (txs) ? 1 : 0; +} + +static bool wlan_tx_consume_retry(struct carl9170_tx_superframe *super) +{ + /* check if this was the last possible retry with this rate */ + if (unlikely(super->s.cnt >= super->s.ri[super->s.rix].tries)) { + /* end of the road - indicate tx failure */ + if (unlikely(super->s.rix == CARL9170_TX_MAX_RETRY_RATES)) + return false; + + /* check if there are alternative rates available */ + if (!super->s.rr[super->s.rix].set) + return false; + + /* try next retry rate */ + super->f.hdr.phy.set = super->s.rr[super->s.rix].set; + + /* finally - mark the old rate as USED */ + super->s.rix++; + + /* update MAC flags */ + super->f.hdr.mac.erp_prot = super->s.ri[super->s.rix].erp_prot; + super->f.hdr.mac.ampdu = super->s.ri[super->s.rix].ampdu; + + /* reinitialize try counter */ + super->s.cnt = 1; + } else { + /* just increase retry counter */ + super->s.cnt++; + } + + return true; +} + +static inline u16 get_tid(struct ieee80211_hdr *hdr) +{ + return (ieee80211_get_qos_ctl(hdr))[0] & IEEE80211_QOS_CTL_TID_MASK; +} + +/* This function will only work on uint32_t-aligned pointers! */ +static bool same_hdr(const void *_d0, const void *_d1) +{ + const uint32_t *d0 = _d0; + const uint32_t *d1 = _d1; + + /* BUG_ON((unsigned long)d0 & 3 || (unsigned long)d1 & 3)) */ + return !((d0[0] ^ d1[0]) | /* FC + DU */ + (d0[1] ^ d1[1]) | /* addr1 */ + (d0[2] ^ d1[2]) | (d0[3] ^ d1[3]) | /* addr2 + addr3 */ + (d0[4] ^ d1[4])); /* addr3 */ +} + +static inline bool same_aggr(struct ieee80211_hdr *a, struct ieee80211_hdr *b) +{ + return (get_tid(a) == get_tid(b)) || same_hdr(a, b); +} + +static void wlan_tx_ampdu_reset(unsigned int qidx) +{ + fw.wlan.ampdu_prev[qidx] = NULL; +} + +static void wlan_tx_ampdu_end(unsigned int qidx) +{ + struct carl9170_tx_superframe *ht_prev = fw.wlan.ampdu_prev[qidx]; + + if (ht_prev) + ht_prev->f.hdr.mac.ba_end = 1; + + wlan_tx_ampdu_reset(qidx); +} + +static void wlan_tx_ampdu(struct carl9170_tx_superframe *super) +{ + unsigned int qidx = super->s.queue; + struct carl9170_tx_superframe *ht_prev = fw.wlan.ampdu_prev[qidx]; + + if (super->f.hdr.mac.ampdu) { + if (ht_prev && + !same_aggr(&super->f.data.i3e, &ht_prev->f.data.i3e)) + ht_prev->f.hdr.mac.ba_end = 1; + else + super->f.hdr.mac.ba_end = 0; + + fw.wlan.ampdu_prev[qidx] = super; + } else { + wlan_tx_ampdu_end(qidx); + } +} + +/* for all tries */ +static void __wlan_tx(struct dma_desc *desc) +{ + struct carl9170_tx_superframe *super = get_super(desc); + + if (unlikely(super->s.fill_in_tsf)) { + struct ieee80211_mgmt *mgmt = (void *) &super->f.data.i3e; + uint32_t *tsf = (uint32_t *) &mgmt->u.probe_resp.timestamp; + + /* + * Truth be told: this is a hack. + * + * The *real* TSF is definitely going to be higher/older. + * But this hardware emulation code is head and shoulders + * above anything a driver can possibly do. + * + * (even, if it's got an accurate atomic clock source). + */ + + read_tsf(tsf); + } + + wlan_tx_ampdu(super); + +#ifdef CONFIG_CARL9170FW_DEBUG + BUG_ON(fw.phy.psm.state != CARL9170_PSM_WAKE); +#endif /* CONFIG_CARL9170FW_DEBUG */ + + /* insert desc into the right queue */ + dma_put(&fw.wlan.tx_queue[super->s.queue], desc); +} + +static void wlan_assign_seq(struct ieee80211_hdr *hdr, unsigned int vif) +{ + hdr->seq_ctrl &= cpu_to_le16(~IEEE80211_SCTL_SEQ); + hdr->seq_ctrl |= cpu_to_le16(fw.wlan.sequence[vif]); + + if (ieee80211_is_first_frag(hdr->seq_ctrl)) + fw.wlan.sequence[vif] += 0x10; +} + +/* prepares frame for the first transmission */ +static void _wlan_tx(struct dma_desc *desc) +{ + struct carl9170_tx_superframe *super = get_super(desc); + + if (unlikely(super->s.assign_seq)) + wlan_assign_seq(&super->f.data.i3e, super->s.vif_id); + + if (unlikely(super->s.ampdu_commit_density)) { + set(AR9170_MAC_REG_AMPDU_DENSITY, + MOD_VAL(AR9170_MAC_AMPDU_DENSITY, + get(AR9170_MAC_REG_AMPDU_DENSITY), + super->s.ampdu_density)); + } + + if (unlikely(super->s.ampdu_commit_factor)) { + set(AR9170_MAC_REG_AMPDU_FACTOR, + MOD_VAL(AR9170_MAC_AMPDU_FACTOR, + get(AR9170_MAC_REG_AMPDU_FACTOR), + 8 << super->s.ampdu_factor)); + } +} + +/* propagate transmission status back to the driver */ +static bool wlan_tx_status(struct dma_queue *queue, + struct dma_desc *desc) +{ + struct carl9170_tx_superframe *super = get_super(desc); + unsigned int qidx = super->s.queue; + bool txfail = false, success; + + success = true; + + /* update hangcheck */ + fw.wlan.last_super_num[qidx] = 0; + + /* + * Note: + * There could be a corner case when the TXFAIL is set + * even though the frame was properly ACKed by the peer: + * a BlockAckReq with the immediate policy will cause + * the receiving peer to produce a BlockACK unfortunately + * the MAC in this chip seems to be expecting a legacy + * ACK and marks the BAR as failed! + */ + + if (!!(desc->ctrl & AR9170_CTRL_FAIL)) { + txfail = !!(desc->ctrl & AR9170_CTRL_TXFAIL); + + /* reset retry indicator flags */ + desc->ctrl &= ~(AR9170_CTRL_TXFAIL | AR9170_CTRL_BAFAIL); + + /* + * Note: wlan_tx_consume_retry will override the old + * phy [CCK,OFDM, HT, BW20/40, MCS...] and mac vectors + * [AMPDU,RTS/CTS,...] therefore be careful when they + * are used. + */ + if (wlan_tx_consume_retry(super)) { + /* + * retry for simple and aggregated 802.11 frames. + * + * Note: We must not mess up the original frame + * order. + */ + + if (!super->f.hdr.mac.ampdu) { + /* + * 802.11 - 7.1.3.1.5. + * set "Retry Field" for consecutive attempts + * + * Note: For AMPDU see: + * 802.11n 9.9.1.6 "Retransmit Procedures" + */ + super->f.data.i3e.frame_control |= + cpu_to_le16(IEEE80211_FCTL_RETRY); + } + + if (txfail) { + /* Normal TX Failure */ + + /* demise descriptor ownership back to the hardware */ + dma_rearm(desc); + + /* + * And this will get the queue going again. + * To understand why: you have to get the HW + * specs... But sadly I never saw them. + */ + wlan_txunstuck(qidx); + + /* abort cycle - this is necessary due to HW design */ + return false; + } else { + /* (HT-) BlockACK failure */ + + /* + * Unlink the failed attempt and put it into + * the retry queue. The caller routine must + * be aware of this so the frames don't get lost. + */ + +#ifndef CONFIG_CARL9170FW_DEBUG + dma_unlink_head(queue); +#else /* CONFIG_CARL9170FW_DEBUG */ + BUG_ON(dma_unlink_head(queue) != desc); +#endif /* CONFIG_CARL9170FW_DEBUG */ + dma_put(&fw.wlan.tx_retry, desc); + return true; + } + } else { + /* out of frame attempts - discard frame */ + success = false; + } + } + +#ifndef CONFIG_CARL9170FW_DEBUG + dma_unlink_head(queue); +#else /* CONFIG_CARL9170FW_DEBUG */ + BUG_ON(dma_unlink_head(queue) != desc); +#endif /* CONFIG_CARL9170FW_DEBUG */ + if (txfail) { + /* + * Issue the queue bump, + * We need to do this in case this was the frame's last + * possible retry attempt and it unfortunately: it failed. + */ + + wlan_txunstuck(qidx); + } + + unhide_super(desc); + + if (unlikely(super == fw.wlan.fw_desc_data)) { + fw.wlan.fw_desc = desc; + fw.wlan.fw_desc_available = 1; + + if (fw.wlan.fw_desc_callback) + fw.wlan.fw_desc_callback(super, success); + + return true; + } + + if (unlikely(super->s.cab)) + fw.wlan.cab_queue_len[super->s.vif_id]--; + + wlan_tx_complete(super, success); + + if (ieee80211_is_back_req(super->f.data.i3e.frame_control)) { + fw.wlan.queued_bar--; + } + + /* recycle freed descriptors */ + dma_reclaim(&fw.pta.down_queue, desc); + down_trigger(); + return true; +} + +void handle_wlan_tx_completion(void) +{ + struct dma_desc *desc; + int i; + + for (i = AR9170_TXQ_SPECIAL; i >= AR9170_TXQ0; i--) { + __while_desc_bits(desc, &fw.wlan.tx_queue[i], AR9170_OWN_BITS_SW) { + if (!wlan_tx_status(&fw.wlan.tx_queue[i], desc)) { + /* termination requested. */ + break; + } + } + + wlan_tx_ampdu_reset(i); + + for_each_desc(desc, &fw.wlan.tx_retry) + __wlan_tx(desc); + + wlan_tx_ampdu_end(i); + if (!queue_empty(&fw.wlan.tx_queue[i])) + wlan_trigger(BIT(i)); + } +} + +void __hot wlan_tx(struct dma_desc *desc) +{ + struct carl9170_tx_superframe *super = DESC_PAYLOAD(desc); + + if (ieee80211_is_back_req(super->f.data.i3e.frame_control)) { + fw.wlan.queued_bar++; + } + + /* initialize rate control struct */ + super->s.rix = 0; + super->s.cnt = 1; + hide_super(desc); + + if (unlikely(super->s.cab)) { + fw.wlan.cab_queue_len[super->s.vif_id]++; + dma_put(&fw.wlan.cab_queue[super->s.vif_id], desc); + return; + } + + _wlan_tx(desc); + __wlan_tx(desc); + wlan_trigger(BIT(super->s.queue)); +} + +void wlan_tx_fw(struct carl9170_tx_superdesc *super, fw_desc_callback_t cb) +{ + if (!fw.wlan.fw_desc_available) + return; + + fw.wlan.fw_desc_available = 0; + + /* Format BlockAck */ + fw.wlan.fw_desc->ctrl = AR9170_CTRL_FS_BIT | AR9170_CTRL_LS_BIT; + fw.wlan.fw_desc->status = AR9170_OWN_BITS_SW; + + fw.wlan.fw_desc->totalLen = fw.wlan.fw_desc->dataSize = super->len; + fw.wlan.fw_desc_data = fw.wlan.fw_desc->dataAddr = super; + fw.wlan.fw_desc->nextAddr = fw.wlan.fw_desc->lastAddr = + fw.wlan.fw_desc; + fw.wlan.fw_desc_callback = cb; + wlan_tx(fw.wlan.fw_desc); +} + +void wlan_send_buffered_ba(void) +{ + struct carl9170_tx_ba_superframe *baf = &dma_mem.reserved.ba.ba; + struct ieee80211_ba *ba = (struct ieee80211_ba *) &baf->f.ba; + struct carl9170_bar_ctx *ctx; + + if (likely(!fw.wlan.queued_ba)) + return; + + /* there's no point to continue when the ba_desc is not available. */ + if (!fw.wlan.fw_desc_available) + return; + + ctx = &fw.wlan.ba_cache[fw.wlan.ba_head_idx]; + fw.wlan.ba_head_idx++; + fw.wlan.ba_head_idx %= CONFIG_CARL9170FW_BACK_REQS_NUM; + fw.wlan.queued_ba--; + + baf->s.len = sizeof(struct carl9170_tx_superdesc) + + sizeof(struct ar9170_tx_hwdesc) + + sizeof(struct ieee80211_ba); + baf->s.ri[0].tries = 1; + baf->s.cookie = 0; + baf->s.queue = AR9170_TXQ_VO; + baf->f.hdr.length = sizeof(struct ieee80211_ba) + FCS_LEN; + + baf->f.hdr.mac.no_ack = 1; + + baf->f.hdr.phy.modulation = 1; /* OFDM */ + baf->f.hdr.phy.tx_power = 34; /* 17 dBm */ + baf->f.hdr.phy.chains = 1; + baf->f.hdr.phy.mcs = AR9170_TXRX_PHY_RATE_OFDM_6M; + + /* format outgoing BA */ + ba->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_BACK); + ba->duration = cpu_to_le16(0); + + /* the BAR contains all necessary MACs. All we need is to swap them */ + memcpy(ba->ra, ctx->ta, 6); + memcpy(ba->ta, ctx->ra, 6); + + /* + * Unfortunately, we cannot look into the hardware's scoreboard. + * Therefore we have to proceed as described in 802.11n 9.10.7.5 + * and send a null BlockAck. + */ + memset(ba->bitmap, 0x0, sizeof(ba->bitmap)); + + /* + * Both, the original firmare and ath9k set the NO ACK flag in + * the BA Ack Policy subfield. + */ + ba->control = ctx->control | cpu_to_le16(1); + ba->start_seq_num = ctx->start_seq_num; + wlan_tx_fw(&baf->s, NULL); +} + +void wlan_cab_flush_queue(const unsigned int vif) +{ + struct dma_queue *cab_queue = &fw.wlan.cab_queue[vif]; + struct dma_desc *desc; + + /* move queued frames into the main tx queues */ + for_each_desc(desc, cab_queue) { + struct carl9170_tx_superframe *super = get_super(desc); + if (!queue_empty(cab_queue)) { + /* + * Set MOREDATA flag for all, + * but the last queued frame. + * see: 802.11-2007 11.2.1.5 f) + * + * This is actually the reason to why + * we need to prevent the reentry. + */ + + super->f.data.i3e.frame_control |= + cpu_to_le16(IEEE80211_FCTL_MOREDATA); + } else { + super->f.data.i3e.frame_control &= + cpu_to_le16(~IEEE80211_FCTL_MOREDATA); + } + + /* ready to roll! */ + _wlan_tx(desc); + __wlan_tx(desc); + wlan_trigger(BIT(super->s.queue)); + } +} + +static uint8_t *beacon_find_ie(uint8_t ie, void *addr, + const unsigned int len) +{ + struct ieee80211_mgmt *mgmt = addr; + uint8_t *pos, *end; + + pos = mgmt->u.beacon.variable; + end = (uint8_t *) ((unsigned long)mgmt + (len - FCS_LEN)); + while (pos < end) { + if (pos + 2 + pos[1] > end) + return NULL; + + if (pos[0] == ie) + return pos; + + pos += pos[1] + 2; + } + + return NULL; +} + +void wlan_modify_beacon(const unsigned int vif, + const unsigned int addr, const unsigned int len) +{ + uint8_t *_ie; + struct ieee80211_tim_ie *ie; + + _ie = beacon_find_ie(WLAN_EID_TIM, (void *)addr, len); + if (likely(_ie)) { + ie = (struct ieee80211_tim_ie *) &_ie[2]; + + if (!queue_empty(&fw.wlan.cab_queue[vif]) && (ie->dtim_count == 0)) { + /* schedule DTIM transfer */ + fw.wlan.cab_flush_trigger[vif] = CARL9170_CAB_TRIGGER_ARMED; + } else if ((fw.wlan.cab_queue_len[vif] == 0) && (fw.wlan.cab_flush_trigger[vif])) { + /* undo all chances to the beacon structure */ + ie->bitmap_ctrl &= ~0x1; + fw.wlan.cab_flush_trigger[vif] = CARL9170_CAB_TRIGGER_EMPTY; + } + + /* Triggered by CARL9170_CAB_TRIGGER_ARMED || CARL9170_CAB_TRIGGER_DEFER */ + if (fw.wlan.cab_flush_trigger[vif]) { + /* Set the almighty Multicast Traffic Indication Bit. */ + ie->bitmap_ctrl |= 0x1; + } + } + + /* + * Ideally, the sequence number should be assigned by the TX arbiter + * hardware. But AFAIK that's not possible, so we have to go for the + * next best thing and write it into the beacon fifo during the open + * beacon update window. + */ + + wlan_assign_seq((struct ieee80211_hdr *)addr, vif); +} + +void wlan_send_buffered_cab(void) +{ + unsigned int i; + + for (i = 0; i < CARL9170_INTF_NUM; i++) { + if (unlikely(fw.wlan.cab_flush_trigger[i] == CARL9170_CAB_TRIGGER_ARMED)) { + /* + * This is hardcoded into carl9170usb driver. + * + * The driver must set the PRETBTT event to beacon_interval - + * CARL9170_PRETBTT_KUS (usually 6) Kus. + * + * But still, we can only do so much about 802.11-2007 9.3.2.1 & + * 11.2.1.6. Let's hope the current solution is adequate enough. + */ + + if (is_after_msecs(fw.wlan.cab_flush_time, (CARL9170_TBTT_DELTA))) { + wlan_cab_flush_queue(i); + + /* + * This prevents the code from sending new BC/MC frames + * which were queued after the previous buffered traffic + * has been sent out... They will have to wait until the + * next DTIM beacon comes along. + */ + fw.wlan.cab_flush_trigger[i] = CARL9170_CAB_TRIGGER_DEFER; + } + } + + } +} -- 2.31.1