diff options
Diffstat (limited to 'drivers/net/wireless/ti/wlcore/tx.c')
| -rw-r--r-- | drivers/net/wireless/ti/wlcore/tx.c | 1056 |
1 files changed, 1056 insertions, 0 deletions
diff --git a/drivers/net/wireless/ti/wlcore/tx.c b/drivers/net/wireless/ti/wlcore/tx.c new file mode 100644 index 00000000000..6893bc20799 --- /dev/null +++ b/drivers/net/wireless/ti/wlcore/tx.c @@ -0,0 +1,1056 @@ +/* + * This file is part of wl1271 + * + * Copyright (C) 2009 Nokia Corporation + * + * Contact: Luciano Coelho <luciano.coelho@nokia.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * version 2 as published by the Free Software Foundation. + * + * 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 St, Fifth Floor, Boston, MA + * 02110-1301 USA + * + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/etherdevice.h> + +#include "wlcore.h" +#include "debug.h" +#include "io.h" +#include "ps.h" +#include "tx.h" +#include "event.h" +#include "hw_ops.h" + +/* + * TODO: this is here just for now, it must be removed when the data + * operations are in place. + */ +#include "../wl12xx/reg.h" + +static int wl1271_set_default_wep_key(struct wl1271 *wl, + struct wl12xx_vif *wlvif, u8 id) +{ + int ret; + bool is_ap = (wlvif->bss_type == BSS_TYPE_AP_BSS); + + if (is_ap) + ret = wl12xx_cmd_set_default_wep_key(wl, id, + wlvif->ap.bcast_hlid); + else + ret = wl12xx_cmd_set_default_wep_key(wl, id, wlvif->sta.hlid); + + if (ret < 0) + return ret; + + wl1271_debug(DEBUG_CRYPT, "default wep key idx: %d", (int)id); + return 0; +} + +static int wl1271_alloc_tx_id(struct wl1271 *wl, struct sk_buff *skb) +{ + int id; + + id = find_first_zero_bit(wl->tx_frames_map, wl->num_tx_desc); + if (id >= wl->num_tx_desc) + return -EBUSY; + + __set_bit(id, wl->tx_frames_map); + wl->tx_frames[id] = skb; + wl->tx_frames_cnt++; + return id; +} + +static void wl1271_free_tx_id(struct wl1271 *wl, int id) +{ + if (__test_and_clear_bit(id, wl->tx_frames_map)) { + if (unlikely(wl->tx_frames_cnt == wl->num_tx_desc)) + clear_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags); + + wl->tx_frames[id] = NULL; + wl->tx_frames_cnt--; + } +} + +static void wl1271_tx_ap_update_inconnection_sta(struct wl1271 *wl, + struct sk_buff *skb) +{ + struct ieee80211_hdr *hdr; + + /* + * add the station to the known list before transmitting the + * authentication response. this way it won't get de-authed by FW + * when transmitting too soon. + */ + hdr = (struct ieee80211_hdr *)(skb->data + + sizeof(struct wl1271_tx_hw_descr)); + if (ieee80211_is_auth(hdr->frame_control)) + wl1271_acx_set_inconnection_sta(wl, hdr->addr1); +} + +static void wl1271_tx_regulate_link(struct wl1271 *wl, + struct wl12xx_vif *wlvif, + u8 hlid) +{ + bool fw_ps, single_sta; + u8 tx_pkts; + + if (WARN_ON(!test_bit(hlid, wlvif->links_map))) + return; + + fw_ps = test_bit(hlid, (unsigned long *)&wl->ap_fw_ps_map); + tx_pkts = wl->links[hlid].allocated_pkts; + single_sta = (wl->active_sta_count == 1); + + /* + * if in FW PS and there is enough data in FW we can put the link + * into high-level PS and clean out its TX queues. + * Make an exception if this is the only connected station. In this + * case FW-memory congestion is not a problem. + */ + if (!single_sta && fw_ps && tx_pkts >= WL1271_PS_STA_MAX_PACKETS) + wl12xx_ps_link_start(wl, wlvif, hlid, true); +} + +bool wl12xx_is_dummy_packet(struct wl1271 *wl, struct sk_buff *skb) +{ + return wl->dummy_packet == skb; +} + +u8 wl12xx_tx_get_hlid_ap(struct wl1271 *wl, struct wl12xx_vif *wlvif, + struct sk_buff *skb) +{ + struct ieee80211_tx_info *control = IEEE80211_SKB_CB(skb); + + if (control->control.sta) { + struct wl1271_station *wl_sta; + + wl_sta = (struct wl1271_station *) + control->control.sta->drv_priv; + return wl_sta->hlid; + } else { + struct ieee80211_hdr *hdr; + + if (!test_bit(WLVIF_FLAG_AP_STARTED, &wlvif->flags)) + return wl->system_hlid; + + hdr = (struct ieee80211_hdr *)skb->data; + if (ieee80211_is_mgmt(hdr->frame_control)) + return wlvif->ap.global_hlid; + else + return wlvif->ap.bcast_hlid; + } +} + +u8 wl12xx_tx_get_hlid(struct wl1271 *wl, struct wl12xx_vif *wlvif, + struct sk_buff *skb) +{ + struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; + + if (!wlvif || wl12xx_is_dummy_packet(wl, skb)) + return wl->system_hlid; + + if (wlvif->bss_type == BSS_TYPE_AP_BSS) + return wl12xx_tx_get_hlid_ap(wl, wlvif, skb); + + if ((test_bit(WLVIF_FLAG_STA_ASSOCIATED, &wlvif->flags) || + test_bit(WLVIF_FLAG_IBSS_JOINED, &wlvif->flags)) && + !ieee80211_is_auth(hdr->frame_control) && + !ieee80211_is_assoc_req(hdr->frame_control)) + return wlvif->sta.hlid; + else + return wlvif->dev_hlid; +} + +unsigned int wlcore_calc_packet_alignment(struct wl1271 *wl, + unsigned int packet_length) +{ + if (wl->quirks & WLCORE_QUIRK_TX_BLOCKSIZE_ALIGN) + return ALIGN(packet_length, WL12XX_BUS_BLOCK_SIZE); + else + return ALIGN(packet_length, WL1271_TX_ALIGN_TO); +} +EXPORT_SYMBOL(wlcore_calc_packet_alignment); + +static int wl1271_tx_allocate(struct wl1271 *wl, struct wl12xx_vif *wlvif, + struct sk_buff *skb, u32 extra, u32 buf_offset, + u8 hlid) +{ + struct wl1271_tx_hw_descr *desc; + u32 total_len = skb->len + sizeof(struct wl1271_tx_hw_descr) + extra; + u32 total_blocks; + int id, ret = -EBUSY, ac; + u32 spare_blocks = wl->normal_tx_spare; + bool is_dummy = false; + + if (buf_offset + total_len > WL1271_AGGR_BUFFER_SIZE) + return -EAGAIN; + + /* allocate free identifier for the packet */ + id = wl1271_alloc_tx_id(wl, skb); + if (id < 0) + return id; + + if (unlikely(wl12xx_is_dummy_packet(wl, skb))) + is_dummy = true; + else if (wlvif->is_gem) + spare_blocks = wl->gem_tx_spare; + + total_blocks = wlcore_hw_calc_tx_blocks(wl, total_len, spare_blocks); + + if (total_blocks <= wl->tx_blocks_available) { + desc = (struct wl1271_tx_hw_descr *)skb_push( + skb, total_len - skb->len); + + wlcore_hw_set_tx_desc_blocks(wl, desc, total_blocks, + spare_blocks); + + desc->id = id; + + wl->tx_blocks_available -= total_blocks; + wl->tx_allocated_blocks += total_blocks; + + /* If the FW was empty before, arm the Tx watchdog */ + if (wl->tx_allocated_blocks == total_blocks) + wl12xx_rearm_tx_watchdog_locked(wl); + + ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb)); + wl->tx_allocated_pkts[ac]++; + + if (!is_dummy && wlvif && + wlvif->bss_type == BSS_TYPE_AP_BSS && + test_bit(hlid, wlvif->ap.sta_hlid_map)) + wl->links[hlid].allocated_pkts++; + + ret = 0; + + wl1271_debug(DEBUG_TX, + "tx_allocate: size: %d, blocks: %d, id: %d", + total_len, total_blocks, id); + } else { + wl1271_free_tx_id(wl, id); + } + + return ret; +} + +static void wl1271_tx_fill_hdr(struct wl1271 *wl, struct wl12xx_vif *wlvif, + struct sk_buff *skb, u32 extra, + struct ieee80211_tx_info *control, u8 hlid) +{ + struct timespec ts; + struct wl1271_tx_hw_descr *desc; + int ac, rate_idx; + s64 hosttime; + u16 tx_attr = 0; + __le16 frame_control; + struct ieee80211_hdr *hdr; + u8 *frame_start; + bool is_dummy; + + desc = (struct wl1271_tx_hw_descr *) skb->data; + frame_start = (u8 *)(desc + 1); + hdr = (struct ieee80211_hdr *)(frame_start + extra); + frame_control = hdr->frame_control; + + /* relocate space for security header */ + if (extra) { + int hdrlen = ieee80211_hdrlen(frame_control); + memmove(frame_start, hdr, hdrlen); + } + + /* configure packet life time */ + getnstimeofday(&ts); + hosttime = (timespec_to_ns(&ts) >> 10); + desc->start_time = cpu_to_le32(hosttime - wl->time_offset); + + is_dummy = wl12xx_is_dummy_packet(wl, skb); + if (is_dummy || !wlvif || wlvif->bss_type != BSS_TYPE_AP_BSS) + desc->life_time = cpu_to_le16(TX_HW_MGMT_PKT_LIFETIME_TU); + else + desc->life_time = cpu_to_le16(TX_HW_AP_MODE_PKT_LIFETIME_TU); + + /* queue */ + ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb)); + desc->tid = skb->priority; + + if (is_dummy) { + /* + * FW expects the dummy packet to have an invalid session id - + * any session id that is different than the one set in the join + */ + tx_attr = (SESSION_COUNTER_INVALID << + TX_HW_ATTR_OFST_SESSION_COUNTER) & + TX_HW_ATTR_SESSION_COUNTER; + + tx_attr |= TX_HW_ATTR_TX_DUMMY_REQ; + } else if (wlvif) { + /* configure the tx attributes */ + tx_attr = wlvif->session_counter << + TX_HW_ATTR_OFST_SESSION_COUNTER; + } + + desc->hlid = hlid; + if (is_dummy || !wlvif) + rate_idx = 0; + else if (wlvif->bss_type != BSS_TYPE_AP_BSS) { + /* if the packets are destined for AP (have a STA entry) + send them with AP rate policies, otherwise use default + basic rates */ + if (control->flags & IEEE80211_TX_CTL_NO_CCK_RATE) + rate_idx = wlvif->sta.p2p_rate_idx; + else if (control->control.sta) + rate_idx = wlvif->sta.ap_rate_idx; + else + rate_idx = wlvif->sta.basic_rate_idx; + } else { + if (hlid == wlvif->ap.global_hlid) + rate_idx = wlvif->ap.mgmt_rate_idx; + else if (hlid == wlvif->ap.bcast_hlid) + rate_idx = wlvif->ap.bcast_rate_idx; + else + rate_idx = wlvif->ap.ucast_rate_idx[ac]; + } + + tx_attr |= rate_idx << TX_HW_ATTR_OFST_RATE_POLICY; + + /* for WEP shared auth - no fw encryption is needed */ + if (ieee80211_is_auth(frame_control) && + ieee80211_has_protected(frame_control)) + tx_attr |= TX_HW_ATTR_HOST_ENCRYPT; + + desc->reserved = 0; + desc->tx_attr = cpu_to_le16(tx_attr); + + wlcore_hw_set_tx_desc_data_len(wl, desc, skb); +} + +/* caller must hold wl->mutex */ +static int wl1271_prepare_tx_frame(struct wl1271 *wl, struct wl12xx_vif *wlvif, + struct sk_buff *skb, u32 buf_offset) +{ + struct ieee80211_tx_info *info; + u32 extra = 0; + int ret = 0; + u32 total_len; + u8 hlid; + bool is_dummy; + + if (!skb) + return -EINVAL; + + info = IEEE80211_SKB_CB(skb); + + /* TODO: handle dummy packets on multi-vifs */ + is_dummy = wl12xx_is_dummy_packet(wl, skb); + + if (info->control.hw_key && + info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) + extra = WL1271_EXTRA_SPACE_TKIP; + + if (info->control.hw_key) { + bool is_wep; + u8 idx = info->control.hw_key->hw_key_idx; + u32 cipher = info->control.hw_key->cipher; + + is_wep = (cipher == WLAN_CIPHER_SUITE_WEP40) || + (cipher == WLAN_CIPHER_SUITE_WEP104); + + if (unlikely(is_wep && wlvif->default_key != idx)) { + ret = wl1271_set_default_wep_key(wl, wlvif, idx); + if (ret < 0) + return ret; + wlvif->default_key = idx; + } + } + hlid = wl12xx_tx_get_hlid(wl, wlvif, skb); + if (hlid == WL12XX_INVALID_LINK_ID) { + wl1271_error("invalid hlid. dropping skb 0x%p", skb); + return -EINVAL; + } + + ret = wl1271_tx_allocate(wl, wlvif, skb, extra, buf_offset, hlid); + if (ret < 0) + return ret; + + wl1271_tx_fill_hdr(wl, wlvif, skb, extra, info, hlid); + + if (!is_dummy && wlvif && wlvif->bss_type == BSS_TYPE_AP_BSS) { + wl1271_tx_ap_update_inconnection_sta(wl, skb); + wl1271_tx_regulate_link(wl, wlvif, hlid); + } + + /* + * The length of each packet is stored in terms of + * words. Thus, we must pad the skb data to make sure its + * length is aligned. The number of padding bytes is computed + * and set in wl1271_tx_fill_hdr. + * In special cases, we want to align to a specific block size + * (eg. for wl128x with SDIO we align to 256). + */ + total_len = wlcore_calc_packet_alignment(wl, skb->len); + + memcpy(wl->aggr_buf + buf_offset, skb->data, skb->len); + memset(wl->aggr_buf + buf_offset + skb->len, 0, total_len - skb->len); + + /* Revert side effects in the dummy packet skb, so it can be reused */ + if (is_dummy) + skb_pull(skb, sizeof(struct wl1271_tx_hw_descr)); + + return total_len; +} + +u32 wl1271_tx_enabled_rates_get(struct wl1271 *wl, u32 rate_set, + enum ieee80211_band rate_band) +{ + struct ieee80211_supported_band *band; + u32 enabled_rates = 0; + int bit; + + band = wl->hw->wiphy->bands[rate_band]; + for (bit = 0; bit < band->n_bitrates; bit++) { + if (rate_set & 0x1) + enabled_rates |= band->bitrates[bit].hw_value; + rate_set >>= 1; + } + + /* MCS rates indication are on bits 16 - 23 */ + rate_set >>= HW_HT_RATES_OFFSET - band->n_bitrates; + + for (bit = 0; bit < 8; bit++) { + if (rate_set & 0x1) + enabled_rates |= (CONF_HW_BIT_RATE_MCS_0 << bit); + rate_set >>= 1; + } + + return enabled_rates; +} + +void wl1271_handle_tx_low_watermark(struct wl1271 *wl) +{ + unsigned long flags; + int i; + + for (i = 0; i < NUM_TX_QUEUES; i++) { + if (test_bit(i, &wl->stopped_queues_map) && + wl->tx_queue_count[i] <= WL1271_TX_QUEUE_LOW_WATERMARK) { + /* firmware buffer has space, restart queues */ + spin_lock_irqsave(&wl->wl_lock, flags); + ieee80211_wake_queue(wl->hw, + wl1271_tx_get_mac80211_queue(i)); + clear_bit(i, &wl->stopped_queues_map); + spin_unlock_irqrestore(&wl->wl_lock, flags); + } + } +} + +static struct sk_buff_head *wl1271_select_queue(struct wl1271 *wl, + struct sk_buff_head *queues) +{ + int i, q = -1, ac; + u32 min_pkts = 0xffffffff; + + /* + * Find a non-empty ac where: + * 1. There are packets to transmit + * 2. The FW has the least allocated blocks + * + * We prioritize the ACs according to VO>VI>BE>BK + */ + for (i = 0; i < NUM_TX_QUEUES; i++) { + ac = wl1271_tx_get_queue(i); + if (!skb_queue_empty(&queues[ac]) && + (wl->tx_allocated_pkts[ac] < min_pkts)) { + q = ac; + min_pkts = wl->tx_allocated_pkts[q]; + } + } + + if (q == -1) + return NULL; + + return &queues[q]; +} + +static struct sk_buff *wl12xx_lnk_skb_dequeue(struct wl1271 *wl, + struct wl1271_link *lnk) +{ + struct sk_buff *skb; + unsigned long flags; + struct sk_buff_head *queue; + + queue = wl1271_select_queue(wl, lnk->tx_queue); + if (!queue) + return NULL; + + skb = skb_dequeue(queue); + if (skb) { + int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb)); + spin_lock_irqsave(&wl->wl_lock, flags); + WARN_ON_ONCE(wl->tx_queue_count[q] <= 0); + wl->tx_queue_count[q]--; + spin_unlock_irqrestore(&wl->wl_lock, flags); + } + + return skb; +} + +static struct sk_buff *wl12xx_vif_skb_dequeue(struct wl1271 *wl, + struct wl12xx_vif *wlvif) +{ + struct sk_buff *skb = NULL; + int i, h, start_hlid; + + /* start from the link after the last one */ + start_hlid = (wlvif->last_tx_hlid + 1) % WL12XX_MAX_LINKS; + + /* dequeue according to AC, round robin on each link */ + for (i = 0; i < WL12XX_MAX_LINKS; i++) { + h = (start_hlid + i) % WL12XX_MAX_LINKS; + + /* only consider connected stations */ + if (!test_bit(h, wlvif->links_map)) + continue; + + skb = wl12xx_lnk_skb_dequeue(wl, &wl->links[h]); + if (!skb) + continue; + + wlvif->last_tx_hlid = h; + break; + } + + if (!skb) + wlvif->last_tx_hlid = 0; + + return skb; +} + +static struct sk_buff *wl1271_skb_dequeue(struct wl1271 *wl) +{ + unsigned long flags; + struct wl12xx_vif *wlvif = wl->last_wlvif; + struct sk_buff *skb = NULL; + + /* continue from last wlvif (round robin) */ + if (wlvif) { + wl12xx_for_each_wlvif_continue(wl, wlvif) { + skb = wl12xx_vif_skb_dequeue(wl, wlvif); + if (skb) { + wl->last_wlvif = wlvif; + break; + } + } + } + + /* dequeue from the system HLID before the restarting wlvif list */ + if (!skb) + skb = wl12xx_lnk_skb_dequeue(wl, &wl->links[wl->system_hlid]); + + /* do a new pass over the wlvif list */ + if (!skb) { + wl12xx_for_each_wlvif(wl, wlvif) { + skb = wl12xx_vif_skb_dequeue(wl, wlvif); + if (skb) { + wl->last_wlvif = wlvif; + break; + } + + /* + * No need to continue after last_wlvif. The previous + * pass should have found it. + */ + if (wlvif == wl->last_wlvif) + break; + } + } + + if (!skb && + test_and_clear_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags)) { + int q; + + skb = wl->dummy_packet; + q = wl1271_tx_get_queue(skb_get_queue_mapping(skb)); + spin_lock_irqsave(&wl->wl_lock, flags); + WARN_ON_ONCE(wl->tx_queue_count[q] <= 0); + wl->tx_queue_count[q]--; + spin_unlock_irqrestore(&wl->wl_lock, flags); + } + + return skb; +} + +static void wl1271_skb_queue_head(struct wl1271 *wl, struct wl12xx_vif *wlvif, + struct sk_buff *skb) +{ + unsigned long flags; + int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb)); + + if (wl12xx_is_dummy_packet(wl, skb)) { + set_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags); + } else { + u8 hlid = wl12xx_tx_get_hlid(wl, wlvif, skb); + skb_queue_head(&wl->links[hlid].tx_queue[q], skb); + + /* make sure we dequeue the same packet next time */ + wlvif->last_tx_hlid = (hlid + WL12XX_MAX_LINKS - 1) % + WL12XX_MAX_LINKS; + } + + spin_lock_irqsave(&wl->wl_lock, flags); + wl->tx_queue_count[q]++; + spin_unlock_irqrestore(&wl->wl_lock, flags); +} + +static bool wl1271_tx_is_data_present(struct sk_buff *skb) +{ + struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)(skb->data); + + return ieee80211_is_data_present(hdr->frame_control); +} + +void wl12xx_rearm_rx_streaming(struct wl1271 *wl, unsigned long *active_hlids) +{ + struct wl12xx_vif *wlvif; + u32 timeout; + u8 hlid; + + if (!wl->conf.rx_streaming.interval) + return; + + if (!wl->conf.rx_streaming.always && + !test_bit(WL1271_FLAG_SOFT_GEMINI, &wl->flags)) + return; + + timeout = wl->conf.rx_streaming.duration; + wl12xx_for_each_wlvif_sta(wl, wlvif) { + bool found = false; + for_each_set_bit(hlid, active_hlids, WL12XX_MAX_LINKS) { + if (test_bit(hlid, wlvif->links_map)) { + found = true; + break; + } + } + + if (!found) + continue; + + /* enable rx streaming */ + if (!test_bit(WLVIF_FLAG_RX_STREAMING_STARTED, &wlvif->flags)) + ieee80211_queue_work(wl->hw, + &wlvif->rx_streaming_enable_work); + + mod_timer(&wlvif->rx_streaming_timer, + jiffies + msecs_to_jiffies(timeout)); + } +} + +void wl1271_tx_work_locked(struct wl1271 *wl) +{ + struct wl12xx_vif *wlvif; + struct sk_buff *skb; + struct wl1271_tx_hw_descr *desc; + u32 buf_offset = 0; + bool sent_packets = false; + unsigned long active_hlids[BITS_TO_LONGS(WL12XX_MAX_LINKS)] = {0}; + int ret; + + if (unlikely(wl->state == WL1271_STATE_OFF)) + return; + + while ((skb = wl1271_skb_dequeue(wl))) { + struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); + bool has_data = false; + + wlvif = NULL; + if (!wl12xx_is_dummy_packet(wl, skb) && info->control.vif) + wlvif = wl12xx_vif_to_data(info->control.vif); + + has_data = wlvif && wl1271_tx_is_data_present(skb); + ret = wl1271_prepare_tx_frame(wl, wlvif, skb, buf_offset); + if (ret == -EAGAIN) { + /* + * Aggregation buffer is full. + * Flush buffer and try again. + */ + wl1271_skb_queue_head(wl, wlvif, skb); + wlcore_write_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf, + buf_offset, true); + sent_packets = true; + buf_offset = 0; + continue; + } else if (ret == -EBUSY) { + /* + * Firmware buffer is full. + * Queue back last skb, and stop aggregating. + */ + wl1271_skb_queue_head(wl, wlvif, skb); + /* No work left, avoid scheduling redundant tx work */ + set_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags); + goto out_ack; + } else if (ret < 0) { + if (wl12xx_is_dummy_packet(wl, skb)) + /* + * fw still expects dummy packet, + * so re-enqueue it + */ + wl1271_skb_queue_head(wl, wlvif, skb); + else + ieee80211_free_txskb(wl->hw, skb); + goto out_ack; + } + buf_offset += ret; + wl->tx_packets_count++; + if (has_data) { + desc = (struct wl1271_tx_hw_descr *) skb->data; + __set_bit(desc->hlid, active_hlids); + } + } + +out_ack: + if (buf_offset) { + wlcore_write_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf, + buf_offset, true); + sent_packets = true; + } + if (sent_packets) { + /* + * Interrupt the firmware with the new packets. This is only + * required for older hardware revisions + */ + if (wl->quirks & WLCORE_QUIRK_END_OF_TRANSACTION) + wl1271_write32(wl, WL12XX_HOST_WR_ACCESS, + wl->tx_packets_count); + + wl1271_handle_tx_low_watermark(wl); + } + wl12xx_rearm_rx_streaming(wl, active_hlids); +} + +void wl1271_tx_work(struct work_struct *work) +{ + struct wl1271 *wl = container_of(work, struct wl1271, tx_work); + int ret; + + mutex_lock(&wl->mutex); + ret = wl1271_ps_elp_wakeup(wl); + if (ret < 0) + goto out; + + wl1271_tx_work_locked(wl); + + wl1271_ps_elp_sleep(wl); +out: + mutex_unlock(&wl->mutex); +} + +static u8 wl1271_tx_get_rate_flags(u8 rate_class_index) +{ + u8 flags = 0; + + /* + * TODO: use wl12xx constants when this code is moved to wl12xx, as + * only it uses Tx-completion. + */ + if (rate_class_index <= 8) + flags |= IEEE80211_TX_RC_MCS; + + /* + * TODO: use wl12xx constants when this code is moved to wl12xx, as + * only it uses Tx-completion. + */ + if (rate_class_index == 0) + flags |= IEEE80211_TX_RC_SHORT_GI; + + return flags; +} + +static void wl1271_tx_complete_packet(struct wl1271 *wl, + struct wl1271_tx_hw_res_descr *result) +{ + struct ieee80211_tx_info *info; + struct ieee80211_vif *vif; + struct wl12xx_vif *wlvif; + struct sk_buff *skb; + int id = result->id; + int rate = -1; + u8 rate_flags = 0; + u8 retries = 0; + + /* check for id legality */ + if (unlikely(id >= wl->num_tx_desc || wl->tx_frames[id] == NULL)) { + wl1271_warning("TX result illegal id: %d", id); + return; + } + + skb = wl->tx_frames[id]; + info = IEEE80211_SKB_CB(skb); + + if (wl12xx_is_dummy_packet(wl, skb)) { + wl1271_free_tx_id(wl, id); + return; + } + + /* info->control is valid as long as we don't update info->status */ + vif = info->control.vif; + wlvif = wl12xx_vif_to_data(vif); + + /* update the TX status info */ + if (result->status == TX_SUCCESS) { + if (!(info->flags & IEEE80211_TX_CTL_NO_ACK)) + info->flags |= IEEE80211_TX_STAT_ACK; + rate = wlcore_rate_to_idx(wl, result->rate_class_index, + wlvif->band); + rate_flags = wl1271_tx_get_rate_flags(result->rate_class_index); + retries = result->ack_failures; + } else if (result->status == TX_RETRY_EXCEEDED) { + wl->stats.excessive_retries++; + retries = result->ack_failures; + } + + info->status.rates[0].idx = rate; + info->status.rates[0].count = retries; + info->status.rates[0].flags = rate_flags; + info->status.ack_signal = -1; + + wl->stats.retry_count += result->ack_failures; + + /* + * update sequence number only when relevant, i.e. only in + * sessions of TKIP, AES and GEM (not in open or WEP sessions) + */ + if (info->control.hw_key && + (info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP || + info->control.hw_key->cipher == WLAN_CIPHER_SUITE_CCMP || + info->control.hw_key->cipher == WL1271_CIPHER_SUITE_GEM)) { + u8 fw_lsb = result->tx_security_sequence_number_lsb; + u8 cur_lsb = wlvif->tx_security_last_seq_lsb; + + /* + * update security sequence number, taking care of potential + * wrap-around + */ + wlvif->tx_security_seq += (fw_lsb - cur_lsb) & 0xff; + wlvif->tx_security_last_seq_lsb = fw_lsb; + } + + /* remove private header from packet */ + skb_pull(skb, sizeof(struct wl1271_tx_hw_descr)); + + /* remove TKIP header space if present */ + if (info->control.hw_key && + info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) { + int hdrlen = ieee80211_get_hdrlen_from_skb(skb); + memmove(skb->data + WL1271_EXTRA_SPACE_TKIP, skb->data, + hdrlen); + skb_pull(skb, WL1271_EXTRA_SPACE_TKIP); + } + + wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x" + " status 0x%x", + result->id, skb, result->ack_failures, + result->rate_class_index, result->status); + + /* return the packet to the stack */ + skb_queue_tail(&wl->deferred_tx_queue, skb); + queue_work(wl->freezable_wq, &wl->netstack_work); + wl1271_free_tx_id(wl, result->id); +} + +/* Called upon reception of a TX complete interrupt */ +void wl1271_tx_complete(struct wl1271 *wl) +{ + struct wl1271_acx_mem_map *memmap = + (struct wl1271_acx_mem_map *)wl->target_mem_map; + u32 count, fw_counter; + u32 i; + + /* read the tx results from the chipset */ + wl1271_read(wl, le32_to_cpu(memmap->tx_result), + wl->tx_res_if, sizeof(*wl->tx_res_if), false); + fw_counter = le32_to_cpu(wl->tx_res_if->tx_result_fw_counter); + + /* write host counter to chipset (to ack) */ + wl1271_write32(wl, le32_to_cpu(memmap->tx_result) + + offsetof(struct wl1271_tx_hw_res_if, + tx_result_host_counter), fw_counter); + + count = fw_counter - wl->tx_results_count; + wl1271_debug(DEBUG_TX, "tx_complete received, packets: %d", count); + + /* verify that the result buffer is not getting overrun */ + if (unlikely(count > TX_HW_RESULT_QUEUE_LEN)) + wl1271_warning("TX result overflow from chipset: %d", count); + + /* process the results */ + for (i = 0; i < count; i++) { + struct wl1271_tx_hw_res_descr *result; + u8 offset = wl->tx_results_count & TX_HW_RESULT_QUEUE_LEN_MASK; + + /* process the packet */ + result = &(wl->tx_res_if->tx_results_queue[offset]); + wl1271_tx_complete_packet(wl, result); + + wl->tx_results_count++; + } +} +EXPORT_SYMBOL(wl1271_tx_complete); + +void wl1271_tx_reset_link_queues(struct wl1271 *wl, u8 hlid) +{ + struct sk_buff *skb; + int i; + unsigned long flags; + struct ieee80211_tx_info *info; + int total[NUM_TX_QUEUES]; + + for (i = 0; i < NUM_TX_QUEUES; i++) { + total[i] = 0; + while ((skb = skb_dequeue(&wl->links[hlid].tx_queue[i]))) { + wl1271_debug(DEBUG_TX, "link freeing skb 0x%p", skb); + + if (!wl12xx_is_dummy_packet(wl, skb)) { + info = IEEE80211_SKB_CB(skb); + info->status.rates[0].idx = -1; + info->status.rates[0].count = 0; + ieee80211_tx_status_ni(wl->hw, skb); + } + + total[i]++; + } + } + + spin_lock_irqsave(&wl->wl_lock, flags); + for (i = 0; i < NUM_TX_QUEUES; i++) + wl->tx_queue_count[i] -= total[i]; + spin_unlock_irqrestore(&wl->wl_lock, flags); + + wl1271_handle_tx_low_watermark(wl); +} + +/* caller must hold wl->mutex and TX must be stopped */ +void wl12xx_tx_reset_wlvif(struct wl1271 *wl, struct wl12xx_vif *wlvif) +{ + int i; + + /* TX failure */ + for_each_set_bit(i, wlvif->links_map, WL12XX_MAX_LINKS) { + if (wlvif->bss_type == BSS_TYPE_AP_BSS) + wl1271_free_sta(wl, wlvif, i); + else + wlvif->sta.ba_rx_bitmap = 0; + + wl->links[i].allocated_pkts = 0; + wl->links[i].prev_freed_pkts = 0; + } + wlvif->last_tx_hlid = 0; + +} +/* caller must hold wl->mutex and TX must be stopped */ +void wl12xx_tx_reset(struct wl1271 *wl, bool reset_tx_queues) +{ + int i; + struct sk_buff *skb; + struct ieee80211_tx_info *info; + + /* only reset the queues if something bad happened */ + if (WARN_ON_ONCE(wl1271_tx_total_queue_count(wl) != 0)) { + for (i = 0; i < WL12XX_MAX_LINKS; i++) + wl1271_tx_reset_link_queues(wl, i); + + for (i = 0; i < NUM_TX_QUEUES; i++) + wl->tx_queue_count[i] = 0; + } + + wl->stopped_queues_map = 0; + + /* + * Make sure the driver is at a consistent state, in case this + * function is called from a context other than interface removal. + * This call will always wake the TX queues. + */ + if (reset_tx_queues) + wl1271_handle_tx_low_watermark(wl); + + for (i = 0; i < wl->num_tx_desc; i++) { + if (wl->tx_frames[i] == NULL) + continue; + + skb = wl->tx_frames[i]; + wl1271_free_tx_id(wl, i); + wl1271_debug(DEBUG_TX, "freeing skb 0x%p", skb); + + if (!wl12xx_is_dummy_packet(wl, skb)) { + /* + * Remove private headers before passing the skb to + * mac80211 + */ + info = IEEE80211_SKB_CB(skb); + skb_pull(skb, sizeof(struct wl1271_tx_hw_descr)); + if (info->control.hw_key && + info->control.hw_key->cipher == + WLAN_CIPHER_SUITE_TKIP) { + int hdrlen = ieee80211_get_hdrlen_from_skb(skb); + memmove(skb->data + WL1271_EXTRA_SPACE_TKIP, + skb->data, hdrlen); + skb_pull(skb, WL1271_EXTRA_SPACE_TKIP); + } + + info->status.rates[0].idx = -1; + info->status.rates[0].count = 0; + + ieee80211_tx_status_ni(wl->hw, skb); + } + } +} + +#define WL1271_TX_FLUSH_TIMEOUT 500000 + +/* caller must *NOT* hold wl->mutex */ +void wl1271_tx_flush(struct wl1271 *wl) +{ + unsigned long timeout; + int i; + timeout = jiffies + usecs_to_jiffies(WL1271_TX_FLUSH_TIMEOUT); + + while (!time_after(jiffies, timeout)) { + mutex_lock(&wl->mutex); + wl1271_debug(DEBUG_TX, "flushing tx buffer: %d %d", + wl->tx_frames_cnt, + wl1271_tx_total_queue_count(wl)); + if ((wl->tx_frames_cnt == 0) && + (wl1271_tx_total_queue_count(wl) == 0)) { + mutex_unlock(&wl->mutex); + return; + } + mutex_unlock(&wl->mutex); + msleep(1); + } + + wl1271_warning("Unable to flush all TX buffers, timed out."); + + /* forcibly flush all Tx buffers on our queues */ + mutex_lock(&wl->mutex); + for (i = 0; i < WL12XX_MAX_LINKS; i++) + wl1271_tx_reset_link_queues(wl, i); + mutex_unlock(&wl->mutex); +} + +u32 wl1271_tx_min_rate_get(struct wl1271 *wl, u32 rate_set) +{ + if (WARN_ON(!rate_set)) + return 0; + + return BIT(__ffs(rate_set)); +} |