/* * This file is part of wl1271 * * Copyright (C) 2009 Nokia Corporation * * Contact: Luciano Coelho * * 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 #include #include #include #include #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; } 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--; } } EXPORT_SYMBOL(wl1271_free_tx_id); static void wl1271_tx_ap_update_inconnection_sta(struct wl1271 *wl, struct wl12xx_vif *wlvif, struct sk_buff *skb) { struct ieee80211_hdr *hdr; hdr = (struct ieee80211_hdr *)(skb->data + sizeof(struct wl1271_tx_hw_descr)); if (!ieee80211_is_auth(hdr->frame_control)) return; /* * 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. */ wl1271_acx_set_inconnection_sta(wl, wlvif, hdr->addr1); /* * ROC for 1 second on the AP channel for completing the connection. * Note the ROC will be continued by the update_sta_state callbacks * once the station reaches the associated state. */ wlcore_update_inconn_sta(wl, wlvif, NULL, true); wlvif->pending_auth_reply_time = jiffies; cancel_delayed_work(&wlvif->pending_auth_complete_work); ieee80211_queue_delayed_work(wl->hw, &wlvif->pending_auth_complete_work, msecs_to_jiffies(WLCORE_PEND_AUTH_ROC_TIMEOUT)); } static void wl1271_tx_regulate_link(struct wl1271 *wl, struct wl12xx_vif *wlvif, u8 hlid) { bool fw_ps; u8 tx_pkts; if (WARN_ON(!test_bit(hlid, wlvif->links_map))) return; fw_ps = test_bit(hlid, &wl->ap_fw_ps_map); tx_pkts = wl->links[hlid].allocated_pkts; /* * 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 link. In this * case FW-memory congestion is less of a problem. * Note that a single connected STA means 2*ap_count + 1 active links, * since we must account for the global and broadcast AP links * for each AP. The "fw_ps" check assures us the other link is a STA * connected to the AP. Otherwise the FW would not set the PSM bit. */ if (wl->active_link_count > (wl->ap_count*2 + 1) && 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; } EXPORT_SYMBOL(wl12xx_is_dummy_packet); static u8 wl12xx_tx_get_hlid_ap(struct wl1271 *wl, struct wl12xx_vif *wlvif, struct sk_buff *skb, struct ieee80211_sta *sta) { if (sta) { struct wl1271_station *wl_sta; wl_sta = (struct wl1271_station *)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 (is_multicast_ether_addr(ieee80211_get_DA(hdr))) return wlvif->ap.bcast_hlid; else return wlvif->ap.global_hlid; } } u8 wl12xx_tx_get_hlid(struct wl1271 *wl, struct wl12xx_vif *wlvif, struct sk_buff *skb, struct ieee80211_sta *sta) { struct ieee80211_tx_info *control; if (wlvif->bss_type == BSS_TYPE_AP_BSS) return wl12xx_tx_get_hlid_ap(wl, wlvif, skb, sta); control = IEEE80211_SKB_CB(skb); if (control->flags & IEEE80211_TX_CTL_TX_OFFCHAN) { wl1271_debug(DEBUG_TX, "tx offchannel"); return wlvif->dev_hlid; } return wlvif->sta.hlid; } unsigned int wlcore_calc_packet_alignment(struct wl1271 *wl, unsigned int packet_length) { if ((wl->quirks & WLCORE_QUIRK_TX_PAD_LAST_FRAME) || !(wl->quirks & WLCORE_QUIRK_TX_BLOCKSIZE_ALIGN)) return ALIGN(packet_length, WL1271_TX_ALIGN_TO); else return ALIGN(packet_length, WL12XX_BUS_BLOCK_SIZE); } 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, bool is_gem) { 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; if (buf_offset + total_len > wl->aggr_buf_size) return -EAGAIN; spare_blocks = wlcore_hw_get_spare_blocks(wl, is_gem); /* allocate free identifier for the packet */ id = wl1271_alloc_tx_id(wl, skb); if (id < 0) return id; total_blocks = wlcore_hw_calc_tx_blocks(wl, total_len, spare_blocks); if (total_blocks <= wl->tx_blocks_available) { desc = 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. Also do * this on the first Tx after resume, as we always cancel the * watchdog on suspend. */ if (wl->tx_allocated_blocks == total_blocks || test_and_clear_bit(WL1271_FLAG_REINIT_TX_WDOG, &wl->flags)) wl12xx_rearm_tx_watchdog_locked(wl); ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb)); wl->tx_allocated_pkts[ac]++; if (test_bit(hlid, wl->links_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 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); skb_set_network_header(skb, skb_network_offset(skb) + extra); } /* configure packet life time */ hosttime = (ktime_get_boot_ns() >> 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) { u8 session_id = wl->session_ids[hlid]; if ((wl->quirks & WLCORE_QUIRK_AP_ZERO_SESSION_ID) && (wlvif->bss_type == BSS_TYPE_AP_BSS)) session_id = 0; /* configure the tx attributes */ tx_attr = session_id << 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 data packets * send them with AP rate policies (EAPOLs are an exception), * otherwise use default basic rates */ if (skb->protocol == cpu_to_be16(ETH_P_PAE)) rate_idx = wlvif->sta.basic_rate_idx; else if (control->flags & IEEE80211_TX_CTL_NO_CCK_RATE) rate_idx = wlvif->sta.p2p_rate_idx; else if (ieee80211_is_data(frame_control)) 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 || skb->protocol == cpu_to_be16(ETH_P_PAE) || !ieee80211_is_data(frame_control)) /* * send non-data, bcast and EAPOLs using the * min basic rate */ 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; /* send EAPOL frames as voice */ if (control->control.flags & IEEE80211_TX_CTRL_PORT_CTRL_PROTO) tx_attr |= TX_HW_ATTR_EAPOL_FRAME; desc->tx_attr = cpu_to_le16(tx_attr); wlcore_hw_set_tx_desc_csum(wl, desc, skb); 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, u8 hlid) { struct ieee80211_tx_info *info; u32 extra = 0; int ret = 0; u32 total_len; bool is_dummy; bool is_gem = false; if (!skb) { wl1271_error("discarding null skb"); return -EINVAL; } if (hlid == WL12XX_INVALID_LINK_ID) { wl1271_error("invalid hlid. dropping skb 0x%p", skb); return -EINVAL; } info = IEEE80211_SKB_CB(skb); is_dummy = wl12xx_is_dummy_packet(wl, skb); if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) && 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 (WARN_ON(is_wep && wlvif && wlvif->default_key != idx)) { ret = wl1271_set_default_wep_key(wl, wlvif, idx); if (ret < 0) return ret; wlvif->default_key = idx; } is_gem = (cipher == WL1271_CIPHER_SUITE_GEM); } ret = wl1271_tx_allocate(wl, wlvif, skb, extra, buf_offset, hlid, is_gem); 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, wlvif, 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 nl80211_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 - 31 */ rate_set >>= HW_HT_RATES_OFFSET - band->n_bitrates; for (bit = 0; bit < 16; 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) { int i; struct wl12xx_vif *wlvif; wl12xx_for_each_wlvif(wl, wlvif) { for (i = 0; i < NUM_TX_QUEUES; i++) { if (wlcore_is_queue_stopped_by_reason(wl, wlvif, i, WLCORE_QUEUE_STOP_REASON_WATERMARK) && wlvif->tx_queue_count[i] <= WL1271_TX_QUEUE_LOW_WATERMARK) /* firmware buffer has space, restart queues */ wlcore_wake_queue(wl, wlvif, i, WLCORE_QUEUE_STOP_REASON_WATERMARK); } } } static int wlcore_select_ac(struct wl1271 *wl) { 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 (wl->tx_queue_count[ac] && wl->tx_allocated_pkts[ac] < min_pkts) { q = ac; min_pkts = wl->tx_allocated_pkts[q]; } } return q; } static struct sk_buff *wlcore_lnk_dequeue(struct wl1271 *wl, struct wl1271_link *lnk, u8 q) { struct sk_buff *skb; unsigned long flags; skb = skb_dequeue(&lnk->tx_queue[q]); if (skb) { spin_lock_irqsave(&wl->wl_lock, flags); WARN_ON_ONCE(wl->tx_queue_count[q] <= 0); wl->tx_queue_count[q]--; if (lnk->wlvif) { WARN_ON_ONCE(lnk->wlvif->tx_queue_count[q] <= 0); lnk->wlvif->tx_queue_count[q]--; } spin_unlock_irqrestore(&wl->wl_lock, flags); } return skb; } static struct sk_buff *wlcore_lnk_dequeue_high_prio(struct wl1271 *wl, u8 hlid, u8 ac, u8 *low_prio_hlid) { struct wl1271_link *lnk = &wl->links[hlid]; if (!wlcore_hw_lnk_high_prio(wl, hlid, lnk)) { if (*low_prio_hlid == WL12XX_INVALID_LINK_ID && !skb_queue_empty(&lnk->tx_queue[ac]) && wlcore_hw_lnk_low_prio(wl, hlid, lnk)) /* we found the first non-empty low priority queue */ *low_prio_hlid = hlid; return NULL; } return wlcore_lnk_dequeue(wl, lnk, ac); } static struct sk_buff *wlcore_vif_dequeue_high_prio(struct wl1271 *wl, struct wl12xx_vif *wlvif, u8 ac, u8 *hlid, u8 *low_prio_hlid) { 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) % wl->num_links; /* dequeue according to AC, round robin on each link */ for (i = 0; i < wl->num_links; i++) { h = (start_hlid + i) % wl->num_links; /* only consider connected stations */ if (!test_bit(h, wlvif->links_map)) continue; skb = wlcore_lnk_dequeue_high_prio(wl, h, ac, low_prio_hlid); if (!skb) continue; wlvif->last_tx_hlid = h; break; } if (!skb) wlvif->last_tx_hlid = 0; *hlid = wlvif->last_tx_hlid; return skb; } static struct sk_buff *wl1271_skb_dequeue(struct wl1271 *wl, u8 *hlid) { unsigned long flags; struct wl12xx_vif *wlvif = wl->last_wlvif; struct sk_buff *skb = NULL; int ac; u8 low_prio_hlid = WL12XX_INVALID_LINK_ID; ac = wlcore_select_ac(wl); if (ac < 0) goto out; /* continue from last wlvif (round robin) */ if (wlvif) { wl12xx_for_each_wlvif_continue(wl, wlvif) { if (!wlvif->tx_queue_count[ac]) continue; skb = wlcore_vif_dequeue_high_prio(wl, wlvif, ac, hlid, &low_prio_hlid); if (!skb) continue; wl->last_wlvif = wlvif; break; } } /* dequeue from the system HLID before the restarting wlvif list */ if (!skb) { skb = wlcore_lnk_dequeue_high_prio(wl, wl->system_hlid, ac, &low_prio_hlid); if (skb) { *hlid = wl->system_hlid; wl->last_wlvif = NULL; } } /* Do a new pass over the wlvif list. But no need to continue * after last_wlvif. The previous pass should have found it. */ if (!skb) { wl12xx_for_each_wlvif(wl, wlvif) { if (!wlvif->tx_queue_count[ac]) goto next; skb = wlcore_vif_dequeue_high_prio(wl, wlvif, ac, hlid, &low_prio_hlid); if (skb) { wl->last_wlvif = wlvif; break; } next: if (wlvif == wl->last_wlvif) break; } } /* no high priority skbs found - but maybe a low priority one? */ if (!skb && low_prio_hlid != WL12XX_INVALID_LINK_ID) { struct wl1271_link *lnk = &wl->links[low_prio_hlid]; skb = wlcore_lnk_dequeue(wl, lnk, ac); WARN_ON(!skb); /* we checked this before */ *hlid = low_prio_hlid; /* ensure proper round robin in the vif/link levels */ wl->last_wlvif = lnk->wlvif; if (lnk->wlvif) lnk->wlvif->last_tx_hlid = low_prio_hlid; } out: if (!skb && test_and_clear_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags)) { int q; skb = wl->dummy_packet; *hlid = wl->system_hlid; 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, u8 hlid) { 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 { skb_queue_head(&wl->links[hlid].tx_queue[q], skb); /* make sure we dequeue the same packet next time */ wlvif->last_tx_hlid = (hlid + wl->num_links - 1) % wl->num_links; } spin_lock_irqsave(&wl->wl_lock, flags); wl->tx_queue_count[q]++; if (wlvif) wlvif->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, wl->num_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)); } } /* * Returns failure values only in case of failed bus ops within this function. * wl1271_prepare_tx_frame retvals won't be returned in order to avoid * triggering recovery by higher layers when not necessary. * In case a FW command fails within wl1271_prepare_tx_frame fails a recovery * will be queued in wl1271_cmd_send. -EAGAIN/-EBUSY from prepare_tx_frame * can occur and are legitimate so don't propagate. -EINVAL will emit a WARNING * within prepare_tx_frame code but there's nothing we should do about those * as well. */ int wlcore_tx_work_locked(struct wl1271 *wl) { struct wl12xx_vif *wlvif; struct sk_buff *skb; struct wl1271_tx_hw_descr *desc; u32 buf_offset = 0, last_len = 0; bool sent_packets = false; unsigned long active_hlids[BITS_TO_LONGS(WLCORE_MAX_LINKS)] = {0}; int ret = 0; int bus_ret = 0; u8 hlid; if (unlikely(wl->state != WLCORE_STATE_ON)) return 0; while ((skb = wl1271_skb_dequeue(wl, &hlid))) { struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); bool has_data = false; wlvif = NULL; if (!wl12xx_is_dummy_packet(wl, skb)) wlvif = wl12xx_vif_to_data(info->control.vif); else hlid = wl->system_hlid; has_data = wlvif && wl1271_tx_is_data_present(skb); ret = wl1271_prepare_tx_frame(wl, wlvif, skb, buf_offset, hlid); if (ret == -EAGAIN) { /* * Aggregation buffer is full. * Flush buffer and try again. */ wl1271_skb_queue_head(wl, wlvif, skb, hlid); buf_offset = wlcore_hw_pre_pkt_send(wl, buf_offset, last_len); bus_ret = wlcore_write_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf, buf_offset, true); if (bus_ret < 0) goto out; 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, hlid); /* 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, hlid); else ieee80211_free_txskb(wl->hw, skb); goto out_ack; } last_len = ret; buf_offset += last_len; 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) { buf_offset = wlcore_hw_pre_pkt_send(wl, buf_offset, last_len); bus_ret = wlcore_write_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf, buf_offset, true); if (bus_ret < 0) goto out; 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) { bus_ret = wlcore_write32(wl, WL12XX_HOST_WR_ACCESS, wl->tx_packets_count); if (bus_ret < 0) goto out; } wl1271_handle_tx_low_watermark(wl); } wl12xx_rearm_rx_streaming(wl, active_hlids); out: return bus_ret; } 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 = pm_runtime_get_sync(wl->dev); if (ret < 0) { pm_runtime_put_noidle(wl->dev); goto out; } ret = wlcore_tx_work_locked(wl); if (ret < 0) { pm_runtime_put_noidle(wl->dev); wl12xx_queue_recovery_work(wl); goto out; } pm_runtime_mark_last_busy(wl->dev); pm_runtime_put_autosuspend(wl->dev); 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; /* remove private header from packet */ skb_pull(skb, sizeof(struct wl1271_tx_hw_descr)); /* remove TKIP header space if present */ if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) && 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 */ int wlcore_tx_complete(struct wl1271 *wl) { struct wl1271_acx_mem_map *memmap = wl->target_mem_map; u32 count, fw_counter; u32 i; int ret; /* read the tx results from the chipset */ ret = wlcore_read(wl, le32_to_cpu(memmap->tx_result), wl->tx_res_if, sizeof(*wl->tx_res_if), false); if (ret < 0) goto out; fw_counter = le32_to_cpu(wl->tx_res_if->tx_result_fw_counter); /* write host counter to chipset (to ack) */ ret = wlcore_write32(wl, le32_to_cpu(memmap->tx_result) + offsetof(struct wl1271_tx_hw_res_if, tx_result_host_counter), fw_counter); if (ret < 0) goto out; 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++; } out: return ret; } EXPORT_SYMBOL(wlcore_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]; struct wl1271_link *lnk = &wl->links[hlid]; for (i = 0; i < NUM_TX_QUEUES; i++) { total[i] = 0; while ((skb = skb_dequeue(&lnk->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]; if (lnk->wlvif) lnk->wlvif->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, wl->num_links) { if (wlvif->bss_type == BSS_TYPE_AP_BSS && i != wlvif->ap.bcast_hlid && i != wlvif->ap.global_hlid) { /* this calls wl12xx_free_link */ wl1271_free_sta(wl, wlvif, i); } else { u8 hlid = i; wl12xx_free_link(wl, wlvif, &hlid); } } wlvif->last_tx_hlid = 0; for (i = 0; i < NUM_TX_QUEUES; i++) wlvif->tx_queue_count[i] = 0; } /* caller must hold wl->mutex and TX must be stopped */ void wl12xx_tx_reset(struct wl1271 *wl) { int i; struct sk_buff *skb; struct ieee80211_tx_info *info; /* only reset the queues if something bad happened */ if (wl1271_tx_total_queue_count(wl) != 0) { for (i = 0; i < wl->num_links; i++) wl1271_tx_reset_link_queues(wl, i); for (i = 0; i < NUM_TX_QUEUES; i++) wl->tx_queue_count[i] = 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. */ 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 ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) && 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, start_time; int i; start_time = jiffies; timeout = start_time + usecs_to_jiffies(WL1271_TX_FLUSH_TIMEOUT); /* only one flush should be in progress, for consistent queue state */ mutex_lock(&wl->flush_mutex); mutex_lock(&wl->mutex); if (wl->tx_frames_cnt == 0 && wl1271_tx_total_queue_count(wl) == 0) { mutex_unlock(&wl->mutex); goto out; } wlcore_stop_queues(wl, WLCORE_QUEUE_STOP_REASON_FLUSH); while (!time_after(jiffies, timeout)) { wl1271_debug(DEBUG_MAC80211, "flushing tx buffer: %d %d", wl->tx_frames_cnt, wl1271_tx_total_queue_count(wl)); /* force Tx and give the driver some time to flush data */ mutex_unlock(&wl->mutex); if (wl1271_tx_total_queue_count(wl)) wl1271_tx_work(&wl->tx_work); msleep(20); mutex_lock(&wl->mutex); if ((wl->tx_frames_cnt == 0) && (wl1271_tx_total_queue_count(wl) == 0)) { wl1271_debug(DEBUG_MAC80211, "tx flush took %d ms", jiffies_to_msecs(jiffies - start_time)); goto out_wake; } } wl1271_warning("Unable to flush all TX buffers, " "timed out (timeout %d ms", WL1271_TX_FLUSH_TIMEOUT / 1000); /* forcibly flush all Tx buffers on our queues */ for (i = 0; i < wl->num_links; i++) wl1271_tx_reset_link_queues(wl, i); out_wake: wlcore_wake_queues(wl, WLCORE_QUEUE_STOP_REASON_FLUSH); mutex_unlock(&wl->mutex); out: mutex_unlock(&wl->flush_mutex); } EXPORT_SYMBOL_GPL(wl1271_tx_flush); u32 wl1271_tx_min_rate_get(struct wl1271 *wl, u32 rate_set) { if (WARN_ON(!rate_set)) return 0; return BIT(__ffs(rate_set)); } EXPORT_SYMBOL_GPL(wl1271_tx_min_rate_get); void wlcore_stop_queue_locked(struct wl1271 *wl, struct wl12xx_vif *wlvif, u8 queue, enum wlcore_queue_stop_reason reason) { int hwq = wlcore_tx_get_mac80211_queue(wlvif, queue); bool stopped = !!wl->queue_stop_reasons[hwq]; /* queue should not be stopped for this reason */ WARN_ON_ONCE(test_and_set_bit(reason, &wl->queue_stop_reasons[hwq])); if (stopped) return; ieee80211_stop_queue(wl->hw, hwq); } void wlcore_stop_queue(struct wl1271 *wl, struct wl12xx_vif *wlvif, u8 queue, enum wlcore_queue_stop_reason reason) { unsigned long flags; spin_lock_irqsave(&wl->wl_lock, flags); wlcore_stop_queue_locked(wl, wlvif, queue, reason); spin_unlock_irqrestore(&wl->wl_lock, flags); } void wlcore_wake_queue(struct wl1271 *wl, struct wl12xx_vif *wlvif, u8 queue, enum wlcore_queue_stop_reason reason) { unsigned long flags; int hwq = wlcore_tx_get_mac80211_queue(wlvif, queue); spin_lock_irqsave(&wl->wl_lock, flags); /* queue should not be clear for this reason */ WARN_ON_ONCE(!test_and_clear_bit(reason, &wl->queue_stop_reasons[hwq])); if (wl->queue_stop_reasons[hwq]) goto out; ieee80211_wake_queue(wl->hw, hwq); out: spin_unlock_irqrestore(&wl->wl_lock, flags); } void wlcore_stop_queues(struct wl1271 *wl, enum wlcore_queue_stop_reason reason) { int i; unsigned long flags; spin_lock_irqsave(&wl->wl_lock, flags); /* mark all possible queues as stopped */ for (i = 0; i < WLCORE_NUM_MAC_ADDRESSES * NUM_TX_QUEUES; i++) WARN_ON_ONCE(test_and_set_bit(reason, &wl->queue_stop_reasons[i])); /* use the global version to make sure all vifs in mac80211 we don't * know are stopped. */ ieee80211_stop_queues(wl->hw); spin_unlock_irqrestore(&wl->wl_lock, flags); } void wlcore_wake_queues(struct wl1271 *wl, enum wlcore_queue_stop_reason reason) { int i; unsigned long flags; spin_lock_irqsave(&wl->wl_lock, flags); /* mark all possible queues as awake */ for (i = 0; i < WLCORE_NUM_MAC_ADDRESSES * NUM_TX_QUEUES; i++) WARN_ON_ONCE(!test_and_clear_bit(reason, &wl->queue_stop_reasons[i])); /* use the global version to make sure all vifs in mac80211 we don't * know are woken up. */ ieee80211_wake_queues(wl->hw); spin_unlock_irqrestore(&wl->wl_lock, flags); } bool wlcore_is_queue_stopped_by_reason(struct wl1271 *wl, struct wl12xx_vif *wlvif, u8 queue, enum wlcore_queue_stop_reason reason) { unsigned long flags; bool stopped; spin_lock_irqsave(&wl->wl_lock, flags); stopped = wlcore_is_queue_stopped_by_reason_locked(wl, wlvif, queue, reason); spin_unlock_irqrestore(&wl->wl_lock, flags); return stopped; } bool wlcore_is_queue_stopped_by_reason_locked(struct wl1271 *wl, struct wl12xx_vif *wlvif, u8 queue, enum wlcore_queue_stop_reason reason) { int hwq = wlcore_tx_get_mac80211_queue(wlvif, queue); assert_spin_locked(&wl->wl_lock); return test_bit(reason, &wl->queue_stop_reasons[hwq]); } bool wlcore_is_queue_stopped_locked(struct wl1271 *wl, struct wl12xx_vif *wlvif, u8 queue) { int hwq = wlcore_tx_get_mac80211_queue(wlvif, queue); assert_spin_locked(&wl->wl_lock); return !!wl->queue_stop_reasons[hwq]; }