/* * Common code for mac80211 Prism54 drivers * * Copyright (c) 2006, Michael Wu * Copyright (c) 2007-2009, Christian Lamparter * Copyright 2008, Johannes Berg * * Based on: * - the islsm (softmac prism54) driver, which is: * Copyright 2004-2006 Jean-Baptiste Note , et al. * - stlc45xx driver * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies). * * 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. */ #include #include #include #include #include "p54.h" #include "lmac.h" #ifdef P54_MM_DEBUG static void p54_dump_tx_queue(struct p54_common *priv) { unsigned long flags; struct ieee80211_tx_info *info; struct p54_tx_info *range; struct sk_buff *skb; struct p54_hdr *hdr; unsigned int i = 0; u32 prev_addr; u32 largest_hole = 0, free; spin_lock_irqsave(&priv->tx_queue.lock, flags); wiphy_debug(priv->hw->wiphy, "/ --- tx queue dump (%d entries) ---\n", skb_queue_len(&priv->tx_queue)); prev_addr = priv->rx_start; skb_queue_walk(&priv->tx_queue, skb) { info = IEEE80211_SKB_CB(skb); range = (void *) info->rate_driver_data; hdr = (void *) skb->data; free = range->start_addr - prev_addr; wiphy_debug(priv->hw->wiphy, "| [%02d] => [skb:%p skb_len:0x%04x " "hdr:{flags:%02x len:%04x req_id:%04x type:%02x} " "mem:{start:%04x end:%04x, free:%d}]\n", i++, skb, skb->len, le16_to_cpu(hdr->flags), le16_to_cpu(hdr->len), le32_to_cpu(hdr->req_id), le16_to_cpu(hdr->type), range->start_addr, range->end_addr, free); prev_addr = range->end_addr; largest_hole = max(largest_hole, free); } free = priv->rx_end - prev_addr; largest_hole = max(largest_hole, free); wiphy_debug(priv->hw->wiphy, "\\ --- [free: %d], largest free block: %d ---\n", free, largest_hole); spin_unlock_irqrestore(&priv->tx_queue.lock, flags); } #endif /* P54_MM_DEBUG */ /* * So, the firmware is somewhat stupid and doesn't know what places in its * memory incoming data should go to. By poking around in the firmware, we * can find some unused memory to upload our packets to. However, data that we * want the card to TX needs to stay intact until the card has told us that * it is done with it. This function finds empty places we can upload to and * marks allocated areas as reserved if necessary. p54_find_and_unlink_skb or * p54_free_skb frees allocated areas. */ static int p54_assign_address(struct p54_common *priv, struct sk_buff *skb) { struct sk_buff *entry, *target_skb = NULL; struct ieee80211_tx_info *info; struct p54_tx_info *range; struct p54_hdr *data = (void *) skb->data; unsigned long flags; u32 last_addr = priv->rx_start; u32 target_addr = priv->rx_start; u16 len = priv->headroom + skb->len + priv->tailroom + 3; info = IEEE80211_SKB_CB(skb); range = (void *) info->rate_driver_data; len = (range->extra_len + len) & ~0x3; spin_lock_irqsave(&priv->tx_queue.lock, flags); if (unlikely(skb_queue_len(&priv->tx_queue) == 32)) { /* * The tx_queue is now really full. * * TODO: check if the device has crashed and reset it. */ spin_unlock_irqrestore(&priv->tx_queue.lock, flags); return -EBUSY; } skb_queue_walk(&priv->tx_queue, entry) { u32 hole_size; info = IEEE80211_SKB_CB(entry); range = (void *) info->rate_driver_data; hole_size = range->start_addr - last_addr; if (!target_skb && hole_size >= len) { target_skb = entry->prev; hole_size -= len; target_addr = last_addr; break; } last_addr = range->end_addr; } if (unlikely(!target_skb)) { if (priv->rx_end - last_addr >= len) { target_skb = priv->tx_queue.prev; if (!skb_queue_empty(&priv->tx_queue)) { info = IEEE80211_SKB_CB(target_skb); range = (void *)info->rate_driver_data; target_addr = range->end_addr; } } else { spin_unlock_irqrestore(&priv->tx_queue.lock, flags); return -ENOSPC; } } info = IEEE80211_SKB_CB(skb); range = (void *) info->rate_driver_data; range->start_addr = target_addr; range->end_addr = target_addr + len; data->req_id = cpu_to_le32(target_addr + priv->headroom); if (IS_DATA_FRAME(skb) && unlikely(GET_HW_QUEUE(skb) == P54_QUEUE_BEACON)) priv->beacon_req_id = data->req_id; __skb_queue_after(&priv->tx_queue, target_skb, skb); spin_unlock_irqrestore(&priv->tx_queue.lock, flags); return 0; } static void p54_tx_pending(struct p54_common *priv) { struct sk_buff *skb; int ret; skb = skb_dequeue(&priv->tx_pending); if (unlikely(!skb)) return ; ret = p54_assign_address(priv, skb); if (unlikely(ret)) skb_queue_head(&priv->tx_pending, skb); else priv->tx(priv->hw, skb); } static void p54_wake_queues(struct p54_common *priv) { unsigned long flags; unsigned int i; if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED)) return ; p54_tx_pending(priv); spin_lock_irqsave(&priv->tx_stats_lock, flags); for (i = 0; i < priv->hw->queues; i++) { if (priv->tx_stats[i + P54_QUEUE_DATA].len < priv->tx_stats[i + P54_QUEUE_DATA].limit) ieee80211_wake_queue(priv->hw, i); } spin_unlock_irqrestore(&priv->tx_stats_lock, flags); } static int p54_tx_qos_accounting_alloc(struct p54_common *priv, struct sk_buff *skb, const u16 p54_queue) { struct p54_tx_queue_stats *queue; unsigned long flags; if (WARN_ON(p54_queue >= P54_QUEUE_NUM)) return -EINVAL; queue = &priv->tx_stats[p54_queue]; spin_lock_irqsave(&priv->tx_stats_lock, flags); if (unlikely(queue->len >= queue->limit && IS_QOS_QUEUE(p54_queue))) { spin_unlock_irqrestore(&priv->tx_stats_lock, flags); return -ENOSPC; } queue->len++; queue->count++; if (unlikely(queue->len == queue->limit && IS_QOS_QUEUE(p54_queue))) { u16 ac_queue = p54_queue - P54_QUEUE_DATA; ieee80211_stop_queue(priv->hw, ac_queue); } spin_unlock_irqrestore(&priv->tx_stats_lock, flags); return 0; } static void p54_tx_qos_accounting_free(struct p54_common *priv, struct sk_buff *skb) { if (IS_DATA_FRAME(skb)) { unsigned long flags; spin_lock_irqsave(&priv->tx_stats_lock, flags); priv->tx_stats[GET_HW_QUEUE(skb)].len--; spin_unlock_irqrestore(&priv->tx_stats_lock, flags); if (unlikely(GET_HW_QUEUE(skb) == P54_QUEUE_BEACON)) { if (priv->beacon_req_id == GET_REQ_ID(skb)) { /* this is the active beacon set anymore */ priv->beacon_req_id = 0; } complete(&priv->beacon_comp); } } p54_wake_queues(priv); } void p54_free_skb(struct ieee80211_hw *dev, struct sk_buff *skb) { struct p54_common *priv = dev->priv; if (unlikely(!skb)) return ; skb_unlink(skb, &priv->tx_queue); p54_tx_qos_accounting_free(priv, skb); dev_kfree_skb_any(skb); } EXPORT_SYMBOL_GPL(p54_free_skb); static struct sk_buff *p54_find_and_unlink_skb(struct p54_common *priv, const __le32 req_id) { struct sk_buff *entry; unsigned long flags; spin_lock_irqsave(&priv->tx_queue.lock, flags); skb_queue_walk(&priv->tx_queue, entry) { struct p54_hdr *hdr = (struct p54_hdr *) entry->data; if (hdr->req_id == req_id) { __skb_unlink(entry, &priv->tx_queue); spin_unlock_irqrestore(&priv->tx_queue.lock, flags); p54_tx_qos_accounting_free(priv, entry); return entry; } } spin_unlock_irqrestore(&priv->tx_queue.lock, flags); return NULL; } void p54_tx(struct p54_common *priv, struct sk_buff *skb) { skb_queue_tail(&priv->tx_pending, skb); p54_tx_pending(priv); } static int p54_rssi_to_dbm(struct p54_common *priv, int rssi) { int band = priv->hw->conf.channel->band; if (priv->rxhw != 5) return ((rssi * priv->rssical_db[band].mul) / 64 + priv->rssical_db[band].add) / 4; else /* * TODO: find the correct formula */ return ((rssi * priv->rssical_db[band].mul) / 64 + priv->rssical_db[band].add) / 4; } /* * Even if the firmware is capable of dealing with incoming traffic, * while dozing, we have to prepared in case mac80211 uses PS-POLL * to retrieve outstanding frames from our AP. * (see comment in net/mac80211/mlme.c @ line 1993) */ static void p54_pspoll_workaround(struct p54_common *priv, struct sk_buff *skb) { struct ieee80211_hdr *hdr = (void *) skb->data; struct ieee80211_tim_ie *tim_ie; u8 *tim; u8 tim_len; bool new_psm; /* only beacons have a TIM IE */ if (!ieee80211_is_beacon(hdr->frame_control)) return; if (!priv->aid) return; /* only consider beacons from the associated BSSID */ if (compare_ether_addr(hdr->addr3, priv->bssid)) return; tim = p54_find_ie(skb, WLAN_EID_TIM); if (!tim) return; tim_len = tim[1]; tim_ie = (struct ieee80211_tim_ie *) &tim[2]; new_psm = ieee80211_check_tim(tim_ie, tim_len, priv->aid); if (new_psm != priv->powersave_override) { priv->powersave_override = new_psm; p54_set_ps(priv); } } static int p54_rx_data(struct p54_common *priv, struct sk_buff *skb) { struct p54_rx_data *hdr = (struct p54_rx_data *) skb->data; struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); u16 freq = le16_to_cpu(hdr->freq); size_t header_len = sizeof(*hdr); u32 tsf32; u8 rate = hdr->rate & 0xf; /* * If the device is in a unspecified state we have to * ignore all data frames. Else we could end up with a * nasty crash. */ if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED)) return 0; if (!(hdr->flags & cpu_to_le16(P54_HDR_FLAG_DATA_IN_FCS_GOOD))) return 0; if (hdr->decrypt_status == P54_DECRYPT_OK) rx_status->flag |= RX_FLAG_DECRYPTED; if ((hdr->decrypt_status == P54_DECRYPT_FAIL_MICHAEL) || (hdr->decrypt_status == P54_DECRYPT_FAIL_TKIP)) rx_status->flag |= RX_FLAG_MMIC_ERROR; rx_status->signal = p54_rssi_to_dbm(priv, hdr->rssi); if (hdr->rate & 0x10) rx_status->flag |= RX_FLAG_SHORTPRE; if (priv->hw->conf.channel->band == IEEE80211_BAND_5GHZ) rx_status->rate_idx = (rate < 4) ? 0 : rate - 4; else rx_status->rate_idx = rate; rx_status->freq = freq; rx_status->band = priv->hw->conf.channel->band; rx_status->antenna = hdr->antenna; tsf32 = le32_to_cpu(hdr->tsf32); if (tsf32 < priv->tsf_low32) priv->tsf_high32++; rx_status->mactime = ((u64)priv->tsf_high32) << 32 | tsf32; priv->tsf_low32 = tsf32; rx_status->flag |= RX_FLAG_TSFT; if (hdr->flags & cpu_to_le16(P54_HDR_FLAG_DATA_ALIGN)) header_len += hdr->align[0]; skb_pull(skb, header_len); skb_trim(skb, le16_to_cpu(hdr->len)); if (unlikely(priv->hw->conf.flags & IEEE80211_CONF_PS)) p54_pspoll_workaround(priv, skb); ieee80211_rx_irqsafe(priv->hw, skb); ieee80211_queue_delayed_work(priv->hw, &priv->work, msecs_to_jiffies(P54_STATISTICS_UPDATE)); return -1; } static void p54_rx_frame_sent(struct p54_common *priv, struct sk_buff *skb) { struct p54_hdr *hdr = (struct p54_hdr *) skb->data; struct p54_frame_sent *payload = (struct p54_frame_sent *) hdr->data; struct ieee80211_tx_info *info; struct p54_hdr *entry_hdr; struct p54_tx_data *entry_data; struct sk_buff *entry; unsigned int pad = 0, frame_len; int count, idx; entry = p54_find_and_unlink_skb(priv, hdr->req_id); if (unlikely(!entry)) return ; frame_len = entry->len; info = IEEE80211_SKB_CB(entry); entry_hdr = (struct p54_hdr *) entry->data; entry_data = (struct p54_tx_data *) entry_hdr->data; priv->stats.dot11ACKFailureCount += payload->tries - 1; /* * Frames in P54_QUEUE_FWSCAN and P54_QUEUE_BEACON are * generated by the driver. Therefore tx_status is bogus * and we don't want to confuse the mac80211 stack. */ if (unlikely(entry_data->hw_queue < P54_QUEUE_FWSCAN)) { dev_kfree_skb_any(entry); return ; } /* * Clear manually, ieee80211_tx_info_clear_status would * clear the counts too and we need them. */ memset(&info->status.ampdu_ack_len, 0, sizeof(struct ieee80211_tx_info) - offsetof(struct ieee80211_tx_info, status.ampdu_ack_len)); BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, status.ampdu_ack_len) != 23); if (entry_hdr->flags & cpu_to_le16(P54_HDR_FLAG_DATA_ALIGN)) pad = entry_data->align[0]; /* walk through the rates array and adjust the counts */ count = payload->tries; for (idx = 0; idx < 4; idx++) { if (count >= info->status.rates[idx].count) { count -= info->status.rates[idx].count; } else if (count > 0) { info->status.rates[idx].count = count; count = 0; } else { info->status.rates[idx].idx = -1; info->status.rates[idx].count = 0; } } if (!(info->flags & IEEE80211_TX_CTL_NO_ACK) && (!payload->status)) info->flags |= IEEE80211_TX_STAT_ACK; if (payload->status & P54_TX_PSM_CANCELLED) info->flags |= IEEE80211_TX_STAT_TX_FILTERED; info->status.ack_signal = p54_rssi_to_dbm(priv, (int)payload->ack_rssi); /* Undo all changes to the frame. */ switch (entry_data->key_type) { case P54_CRYPTO_TKIPMICHAEL: { u8 *iv = (u8 *)(entry_data->align + pad + entry_data->crypt_offset); /* Restore the original TKIP IV. */ iv[2] = iv[0]; iv[0] = iv[1]; iv[1] = (iv[0] | 0x20) & 0x7f; /* WEPSeed - 8.3.2.2 */ frame_len -= 12; /* remove TKIP_MMIC + TKIP_ICV */ break; } case P54_CRYPTO_AESCCMP: frame_len -= 8; /* remove CCMP_MIC */ break; case P54_CRYPTO_WEP: frame_len -= 4; /* remove WEP_ICV */ break; } skb_trim(entry, frame_len); skb_pull(entry, sizeof(*hdr) + pad + sizeof(*entry_data)); ieee80211_tx_status_irqsafe(priv->hw, entry); } static void p54_rx_eeprom_readback(struct p54_common *priv, struct sk_buff *skb) { struct p54_hdr *hdr = (struct p54_hdr *) skb->data; struct p54_eeprom_lm86 *eeprom = (struct p54_eeprom_lm86 *) hdr->data; struct sk_buff *tmp; if (!priv->eeprom) return ; if (priv->fw_var >= 0x509) { memcpy(priv->eeprom, eeprom->v2.data, le16_to_cpu(eeprom->v2.len)); } else { memcpy(priv->eeprom, eeprom->v1.data, le16_to_cpu(eeprom->v1.len)); } priv->eeprom = NULL; tmp = p54_find_and_unlink_skb(priv, hdr->req_id); dev_kfree_skb_any(tmp); complete(&priv->eeprom_comp); } static void p54_rx_stats(struct p54_common *priv, struct sk_buff *skb) { struct p54_hdr *hdr = (struct p54_hdr *) skb->data; struct p54_statistics *stats = (struct p54_statistics *) hdr->data; struct sk_buff *tmp; u32 tsf32; if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED)) return ; tsf32 = le32_to_cpu(stats->tsf32); if (tsf32 < priv->tsf_low32) priv->tsf_high32++; priv->tsf_low32 = tsf32; priv->stats.dot11RTSFailureCount = le32_to_cpu(stats->rts_fail); priv->stats.dot11RTSSuccessCount = le32_to_cpu(stats->rts_success); priv->stats.dot11FCSErrorCount = le32_to_cpu(stats->rx_bad_fcs); priv->noise = p54_rssi_to_dbm(priv, le32_to_cpu(stats->noise)); tmp = p54_find_and_unlink_skb(priv, hdr->req_id); dev_kfree_skb_any(tmp); } static void p54_rx_trap(struct p54_common *priv, struct sk_buff *skb) { struct p54_hdr *hdr = (struct p54_hdr *) skb->data; struct p54_trap *trap = (struct p54_trap *) hdr->data; u16 event = le16_to_cpu(trap->event); u16 freq = le16_to_cpu(trap->frequency); switch (event) { case P54_TRAP_BEACON_TX: break; case P54_TRAP_RADAR: wiphy_info(priv->hw->wiphy, "radar (freq:%d mhz)\n", freq); break; case P54_TRAP_NO_BEACON: if (priv->vif) ieee80211_beacon_loss(priv->vif); break; case P54_TRAP_SCAN: break; case P54_TRAP_TBTT: break; case P54_TRAP_TIMER: break; case P54_TRAP_FAA_RADIO_OFF: wiphy_rfkill_set_hw_state(priv->hw->wiphy, true); break; case P54_TRAP_FAA_RADIO_ON: wiphy_rfkill_set_hw_state(priv->hw->wiphy, false); break; default: wiphy_info(priv->hw->wiphy, "received event:%x freq:%d\n", event, freq); break; } } static int p54_rx_control(struct p54_common *priv, struct sk_buff *skb) { struct p54_hdr *hdr = (struct p54_hdr *) skb->data; switch (le16_to_cpu(hdr->type)) { case P54_CONTROL_TYPE_TXDONE: p54_rx_frame_sent(priv, skb); break; case P54_CONTROL_TYPE_TRAP: p54_rx_trap(priv, skb); break; case P54_CONTROL_TYPE_BBP: break; case P54_CONTROL_TYPE_STAT_READBACK: p54_rx_stats(priv, skb); break; case P54_CONTROL_TYPE_EEPROM_READBACK: p54_rx_eeprom_readback(priv, skb); break; default: wiphy_debug(priv->hw->wiphy, "not handling 0x%02x type control frame\n", le16_to_cpu(hdr->type)); break; } return 0; } /* returns zero if skb can be reused */ int p54_rx(struct ieee80211_hw *dev, struct sk_buff *skb) { struct p54_common *priv = dev->priv; u16 type = le16_to_cpu(*((__le16 *)skb->data)); if (type & P54_HDR_FLAG_CONTROL) return p54_rx_control(priv, skb); else return p54_rx_data(priv, skb); } EXPORT_SYMBOL_GPL(p54_rx); static void p54_tx_80211_header(struct p54_common *priv, struct sk_buff *skb, struct ieee80211_tx_info *info, u8 *queue, u32 *extra_len, u16 *flags, u16 *aid, bool *burst_possible) { struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; if (ieee80211_is_data_qos(hdr->frame_control)) *burst_possible = true; else *burst_possible = false; if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) *flags |= P54_HDR_FLAG_DATA_OUT_SEQNR; if (info->flags & IEEE80211_TX_CTL_PSPOLL_RESPONSE) *flags |= P54_HDR_FLAG_DATA_OUT_NOCANCEL; if (info->flags & IEEE80211_TX_CTL_CLEAR_PS_FILT) *flags |= P54_HDR_FLAG_DATA_OUT_NOCANCEL; *queue = skb_get_queue_mapping(skb) + P54_QUEUE_DATA; switch (priv->mode) { case NL80211_IFTYPE_MONITOR: /* * We have to set P54_HDR_FLAG_DATA_OUT_PROMISC for * every frame in promiscuous/monitor mode. * see STSW45x0C LMAC API - page 12. */ *aid = 0; *flags |= P54_HDR_FLAG_DATA_OUT_PROMISC; break; case NL80211_IFTYPE_STATION: *aid = 1; break; case NL80211_IFTYPE_AP: case NL80211_IFTYPE_ADHOC: case NL80211_IFTYPE_MESH_POINT: if (info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) { *aid = 0; *queue = P54_QUEUE_CAB; return; } if (unlikely(ieee80211_is_mgmt(hdr->frame_control))) { if (ieee80211_is_probe_resp(hdr->frame_control)) { *aid = 0; *flags |= P54_HDR_FLAG_DATA_OUT_TIMESTAMP | P54_HDR_FLAG_DATA_OUT_NOCANCEL; return; } else if (ieee80211_is_beacon(hdr->frame_control)) { *aid = 0; if (info->flags & IEEE80211_TX_CTL_INJECTED) { /* * Injecting beacons on top of a AP is * not a good idea... nevertheless, * it should be doable. */ return; } *flags |= P54_HDR_FLAG_DATA_OUT_TIMESTAMP; *queue = P54_QUEUE_BEACON; *extra_len = IEEE80211_MAX_TIM_LEN; return; } } if (info->control.sta) *aid = info->control.sta->aid; break; } } static u8 p54_convert_algo(enum ieee80211_key_alg alg) { switch (alg) { case ALG_WEP: return P54_CRYPTO_WEP; case ALG_TKIP: return P54_CRYPTO_TKIPMICHAEL; case ALG_CCMP: return P54_CRYPTO_AESCCMP; default: return 0; } } int p54_tx_80211(struct ieee80211_hw *dev, struct sk_buff *skb) { struct p54_common *priv = dev->priv; struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); struct p54_tx_info *p54info; struct p54_hdr *hdr; struct p54_tx_data *txhdr; unsigned int padding, len, extra_len; int i, j, ridx; u16 hdr_flags = 0, aid = 0; u8 rate, queue = 0, crypt_offset = 0; u8 cts_rate = 0x20; u8 rc_flags; u8 calculated_tries[4]; u8 nrates = 0, nremaining = 8; bool burst_allowed = false; p54_tx_80211_header(priv, skb, info, &queue, &extra_len, &hdr_flags, &aid, &burst_allowed); if (p54_tx_qos_accounting_alloc(priv, skb, queue)) { if (!IS_QOS_QUEUE(queue)) { dev_kfree_skb_any(skb); return NETDEV_TX_OK; } else { return NETDEV_TX_BUSY; } } padding = (unsigned long)(skb->data - (sizeof(*hdr) + sizeof(*txhdr))) & 3; len = skb->len; if (info->control.hw_key) { crypt_offset = ieee80211_get_hdrlen_from_skb(skb); if (info->control.hw_key->alg == ALG_TKIP) { u8 *iv = (u8 *)(skb->data + crypt_offset); /* * The firmware excepts that the IV has to have * this special format */ iv[1] = iv[0]; iv[0] = iv[2]; iv[2] = 0; } } txhdr = (struct p54_tx_data *) skb_push(skb, sizeof(*txhdr) + padding); hdr = (struct p54_hdr *) skb_push(skb, sizeof(*hdr)); if (padding) hdr_flags |= P54_HDR_FLAG_DATA_ALIGN; hdr->type = cpu_to_le16(aid); hdr->rts_tries = info->control.rates[0].count; /* * we register the rates in perfect order, and * RTS/CTS won't happen on 5 GHz */ cts_rate = info->control.rts_cts_rate_idx; memset(&txhdr->rateset, 0, sizeof(txhdr->rateset)); /* see how many rates got used */ for (i = 0; i < dev->max_rates; i++) { if (info->control.rates[i].idx < 0) break; nrates++; } /* limit tries to 8/nrates per rate */ for (i = 0; i < nrates; i++) { /* * The magic expression here is equivalent to 8/nrates for * all values that matter, but avoids division and jumps. * Note that nrates can only take the values 1 through 4. */ calculated_tries[i] = min_t(int, ((15 >> nrates) | 1) + 1, info->control.rates[i].count); nremaining -= calculated_tries[i]; } /* if there are tries left, distribute from back to front */ for (i = nrates - 1; nremaining > 0 && i >= 0; i--) { int tmp = info->control.rates[i].count - calculated_tries[i]; if (tmp <= 0) continue; /* RC requested more tries at this rate */ tmp = min_t(int, tmp, nremaining); calculated_tries[i] += tmp; nremaining -= tmp; } ridx = 0; for (i = 0; i < nrates && ridx < 8; i++) { /* we register the rates in perfect order */ rate = info->control.rates[i].idx; if (info->band == IEEE80211_BAND_5GHZ) rate += 4; /* store the count we actually calculated for TX status */ info->control.rates[i].count = calculated_tries[i]; rc_flags = info->control.rates[i].flags; if (rc_flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE) { rate |= 0x10; cts_rate |= 0x10; } if (rc_flags & IEEE80211_TX_RC_USE_RTS_CTS) { burst_allowed = false; rate |= 0x40; } else if (rc_flags & IEEE80211_TX_RC_USE_CTS_PROTECT) { rate |= 0x20; burst_allowed = false; } for (j = 0; j < calculated_tries[i] && ridx < 8; j++) { txhdr->rateset[ridx] = rate; ridx++; } } if (burst_allowed) hdr_flags |= P54_HDR_FLAG_DATA_OUT_BURST; /* TODO: enable bursting */ hdr->flags = cpu_to_le16(hdr_flags); hdr->tries = ridx; txhdr->rts_rate_idx = 0; if (info->control.hw_key) { txhdr->key_type = p54_convert_algo(info->control.hw_key->alg); txhdr->key_len = min((u8)16, info->control.hw_key->keylen); memcpy(txhdr->key, info->control.hw_key->key, txhdr->key_len); if (info->control.hw_key->alg == ALG_TKIP) { /* reserve space for the MIC key */ len += 8; memcpy(skb_put(skb, 8), &(info->control.hw_key->key [NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY]), 8); } /* reserve some space for ICV */ len += info->control.hw_key->icv_len; memset(skb_put(skb, info->control.hw_key->icv_len), 0, info->control.hw_key->icv_len); } else { txhdr->key_type = 0; txhdr->key_len = 0; } txhdr->crypt_offset = crypt_offset; txhdr->hw_queue = queue; txhdr->backlog = priv->tx_stats[queue].len - 1; memset(txhdr->durations, 0, sizeof(txhdr->durations)); txhdr->tx_antenna = ((info->antenna_sel_tx == 0) ? 2 : info->antenna_sel_tx - 1) & priv->tx_diversity_mask; if (priv->rxhw == 5) { txhdr->longbow.cts_rate = cts_rate; txhdr->longbow.output_power = cpu_to_le16(priv->output_power); } else { txhdr->normal.output_power = priv->output_power; txhdr->normal.cts_rate = cts_rate; } if (padding) txhdr->align[0] = padding; hdr->len = cpu_to_le16(len); /* modifies skb->cb and with it info, so must be last! */ p54info = (void *) info->rate_driver_data; p54info->extra_len = extra_len; p54_tx(priv, skb); return NETDEV_TX_OK; }