diff options
Diffstat (limited to 'kernel/drivers/net/wireless/ath/ath6kl/txrx.c')
| -rw-r--r-- | kernel/drivers/net/wireless/ath/ath6kl/txrx.c | 1877 |
1 files changed, 1877 insertions, 0 deletions
diff --git a/kernel/drivers/net/wireless/ath/ath6kl/txrx.c b/kernel/drivers/net/wireless/ath/ath6kl/txrx.c new file mode 100644 index 000000000..40432fe7a --- /dev/null +++ b/kernel/drivers/net/wireless/ath/ath6kl/txrx.c @@ -0,0 +1,1877 @@ +/* + * Copyright (c) 2004-2011 Atheros Communications Inc. + * Copyright (c) 2011-2012 Qualcomm Atheros, Inc. + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include "core.h" +#include "debug.h" +#include "htc-ops.h" +#include "trace.h" + +/* + * tid - tid_mux0..tid_mux3 + * aid - tid_mux4..tid_mux7 + */ +#define ATH6KL_TID_MASK 0xf +#define ATH6KL_AID_SHIFT 4 + +static inline u8 ath6kl_get_tid(u8 tid_mux) +{ + return tid_mux & ATH6KL_TID_MASK; +} + +static inline u8 ath6kl_get_aid(u8 tid_mux) +{ + return tid_mux >> ATH6KL_AID_SHIFT; +} + +static u8 ath6kl_ibss_map_epid(struct sk_buff *skb, struct net_device *dev, + u32 *map_no) +{ + struct ath6kl *ar = ath6kl_priv(dev); + struct ethhdr *eth_hdr; + u32 i, ep_map = -1; + u8 *datap; + + *map_no = 0; + datap = skb->data; + eth_hdr = (struct ethhdr *) (datap + sizeof(struct wmi_data_hdr)); + + if (is_multicast_ether_addr(eth_hdr->h_dest)) + return ENDPOINT_2; + + for (i = 0; i < ar->node_num; i++) { + if (memcmp(eth_hdr->h_dest, ar->node_map[i].mac_addr, + ETH_ALEN) == 0) { + *map_no = i + 1; + ar->node_map[i].tx_pend++; + return ar->node_map[i].ep_id; + } + + if ((ep_map == -1) && !ar->node_map[i].tx_pend) + ep_map = i; + } + + if (ep_map == -1) { + ep_map = ar->node_num; + ar->node_num++; + if (ar->node_num > MAX_NODE_NUM) + return ENDPOINT_UNUSED; + } + + memcpy(ar->node_map[ep_map].mac_addr, eth_hdr->h_dest, ETH_ALEN); + + for (i = ENDPOINT_2; i <= ENDPOINT_5; i++) { + if (!ar->tx_pending[i]) { + ar->node_map[ep_map].ep_id = i; + break; + } + + /* + * No free endpoint is available, start redistribution on + * the inuse endpoints. + */ + if (i == ENDPOINT_5) { + ar->node_map[ep_map].ep_id = ar->next_ep_id; + ar->next_ep_id++; + if (ar->next_ep_id > ENDPOINT_5) + ar->next_ep_id = ENDPOINT_2; + } + } + + *map_no = ep_map + 1; + ar->node_map[ep_map].tx_pend++; + + return ar->node_map[ep_map].ep_id; +} + +static bool ath6kl_process_uapsdq(struct ath6kl_sta *conn, + struct ath6kl_vif *vif, + struct sk_buff *skb, + u32 *flags) +{ + struct ath6kl *ar = vif->ar; + bool is_apsdq_empty = false; + struct ethhdr *datap = (struct ethhdr *) skb->data; + u8 up = 0, traffic_class, *ip_hdr; + u16 ether_type; + struct ath6kl_llc_snap_hdr *llc_hdr; + + if (conn->sta_flags & STA_PS_APSD_TRIGGER) { + /* + * This tx is because of a uAPSD trigger, determine + * more and EOSP bit. Set EOSP if queue is empty + * or sufficient frames are delivered for this trigger. + */ + spin_lock_bh(&conn->psq_lock); + if (!skb_queue_empty(&conn->apsdq)) + *flags |= WMI_DATA_HDR_FLAGS_MORE; + else if (conn->sta_flags & STA_PS_APSD_EOSP) + *flags |= WMI_DATA_HDR_FLAGS_EOSP; + *flags |= WMI_DATA_HDR_FLAGS_UAPSD; + spin_unlock_bh(&conn->psq_lock); + return false; + } else if (!conn->apsd_info) { + return false; + } + + if (test_bit(WMM_ENABLED, &vif->flags)) { + ether_type = be16_to_cpu(datap->h_proto); + if (is_ethertype(ether_type)) { + /* packet is in DIX format */ + ip_hdr = (u8 *)(datap + 1); + } else { + /* packet is in 802.3 format */ + llc_hdr = (struct ath6kl_llc_snap_hdr *) + (datap + 1); + ether_type = be16_to_cpu(llc_hdr->eth_type); + ip_hdr = (u8 *)(llc_hdr + 1); + } + + if (ether_type == IP_ETHERTYPE) + up = ath6kl_wmi_determine_user_priority( + ip_hdr, 0); + } + + traffic_class = ath6kl_wmi_get_traffic_class(up); + + if ((conn->apsd_info & (1 << traffic_class)) == 0) + return false; + + /* Queue the frames if the STA is sleeping */ + spin_lock_bh(&conn->psq_lock); + is_apsdq_empty = skb_queue_empty(&conn->apsdq); + skb_queue_tail(&conn->apsdq, skb); + spin_unlock_bh(&conn->psq_lock); + + /* + * If this is the first pkt getting queued + * for this STA, update the PVB for this STA + */ + if (is_apsdq_empty) { + ath6kl_wmi_set_apsd_bfrd_traf(ar->wmi, + vif->fw_vif_idx, + conn->aid, 1, 0); + } + *flags |= WMI_DATA_HDR_FLAGS_UAPSD; + + return true; +} + +static bool ath6kl_process_psq(struct ath6kl_sta *conn, + struct ath6kl_vif *vif, + struct sk_buff *skb, + u32 *flags) +{ + bool is_psq_empty = false; + struct ath6kl *ar = vif->ar; + + if (conn->sta_flags & STA_PS_POLLED) { + spin_lock_bh(&conn->psq_lock); + if (!skb_queue_empty(&conn->psq)) + *flags |= WMI_DATA_HDR_FLAGS_MORE; + spin_unlock_bh(&conn->psq_lock); + return false; + } + + /* Queue the frames if the STA is sleeping */ + spin_lock_bh(&conn->psq_lock); + is_psq_empty = skb_queue_empty(&conn->psq); + skb_queue_tail(&conn->psq, skb); + spin_unlock_bh(&conn->psq_lock); + + /* + * If this is the first pkt getting queued + * for this STA, update the PVB for this + * STA. + */ + if (is_psq_empty) + ath6kl_wmi_set_pvb_cmd(ar->wmi, + vif->fw_vif_idx, + conn->aid, 1); + return true; +} + +static bool ath6kl_powersave_ap(struct ath6kl_vif *vif, struct sk_buff *skb, + u32 *flags) +{ + struct ethhdr *datap = (struct ethhdr *) skb->data; + struct ath6kl_sta *conn = NULL; + bool ps_queued = false; + struct ath6kl *ar = vif->ar; + + if (is_multicast_ether_addr(datap->h_dest)) { + u8 ctr = 0; + bool q_mcast = false; + + for (ctr = 0; ctr < AP_MAX_NUM_STA; ctr++) { + if (ar->sta_list[ctr].sta_flags & STA_PS_SLEEP) { + q_mcast = true; + break; + } + } + + if (q_mcast) { + /* + * If this transmit is not because of a Dtim Expiry + * q it. + */ + if (!test_bit(DTIM_EXPIRED, &vif->flags)) { + bool is_mcastq_empty = false; + + spin_lock_bh(&ar->mcastpsq_lock); + is_mcastq_empty = + skb_queue_empty(&ar->mcastpsq); + skb_queue_tail(&ar->mcastpsq, skb); + spin_unlock_bh(&ar->mcastpsq_lock); + + /* + * If this is the first Mcast pkt getting + * queued indicate to the target to set the + * BitmapControl LSB of the TIM IE. + */ + if (is_mcastq_empty) + ath6kl_wmi_set_pvb_cmd(ar->wmi, + vif->fw_vif_idx, + MCAST_AID, 1); + + ps_queued = true; + } else { + /* + * This transmit is because of Dtim expiry. + * Determine if MoreData bit has to be set. + */ + spin_lock_bh(&ar->mcastpsq_lock); + if (!skb_queue_empty(&ar->mcastpsq)) + *flags |= WMI_DATA_HDR_FLAGS_MORE; + spin_unlock_bh(&ar->mcastpsq_lock); + } + } + } else { + conn = ath6kl_find_sta(vif, datap->h_dest); + if (!conn) { + dev_kfree_skb(skb); + + /* Inform the caller that the skb is consumed */ + return true; + } + + if (conn->sta_flags & STA_PS_SLEEP) { + ps_queued = ath6kl_process_uapsdq(conn, + vif, skb, flags); + if (!(*flags & WMI_DATA_HDR_FLAGS_UAPSD)) + ps_queued = ath6kl_process_psq(conn, + vif, skb, flags); + } + } + return ps_queued; +} + +/* Tx functions */ + +int ath6kl_control_tx(void *devt, struct sk_buff *skb, + enum htc_endpoint_id eid) +{ + struct ath6kl *ar = devt; + int status = 0; + struct ath6kl_cookie *cookie = NULL; + + trace_ath6kl_wmi_cmd(skb->data, skb->len); + + if (WARN_ON_ONCE(ar->state == ATH6KL_STATE_WOW)) { + dev_kfree_skb(skb); + return -EACCES; + } + + if (WARN_ON_ONCE(eid == ENDPOINT_UNUSED || + eid >= ENDPOINT_MAX)) { + status = -EINVAL; + goto fail_ctrl_tx; + } + + spin_lock_bh(&ar->lock); + + ath6kl_dbg(ATH6KL_DBG_WLAN_TX, + "%s: skb=0x%p, len=0x%x eid =%d\n", __func__, + skb, skb->len, eid); + + if (test_bit(WMI_CTRL_EP_FULL, &ar->flag) && (eid == ar->ctrl_ep)) { + /* + * Control endpoint is full, don't allocate resources, we + * are just going to drop this packet. + */ + cookie = NULL; + ath6kl_err("wmi ctrl ep full, dropping pkt : 0x%p, len:%d\n", + skb, skb->len); + } else { + cookie = ath6kl_alloc_cookie(ar); + } + + if (cookie == NULL) { + spin_unlock_bh(&ar->lock); + status = -ENOMEM; + goto fail_ctrl_tx; + } + + ar->tx_pending[eid]++; + + if (eid != ar->ctrl_ep) + ar->total_tx_data_pend++; + + spin_unlock_bh(&ar->lock); + + cookie->skb = skb; + cookie->map_no = 0; + set_htc_pkt_info(&cookie->htc_pkt, cookie, skb->data, skb->len, + eid, ATH6KL_CONTROL_PKT_TAG); + cookie->htc_pkt.skb = skb; + + /* + * This interface is asynchronous, if there is an error, cleanup + * will happen in the TX completion callback. + */ + ath6kl_htc_tx(ar->htc_target, &cookie->htc_pkt); + + return 0; + +fail_ctrl_tx: + dev_kfree_skb(skb); + return status; +} + +int ath6kl_data_tx(struct sk_buff *skb, struct net_device *dev) +{ + struct ath6kl *ar = ath6kl_priv(dev); + struct ath6kl_cookie *cookie = NULL; + enum htc_endpoint_id eid = ENDPOINT_UNUSED; + struct ath6kl_vif *vif = netdev_priv(dev); + u32 map_no = 0; + u16 htc_tag = ATH6KL_DATA_PKT_TAG; + u8 ac = 99; /* initialize to unmapped ac */ + bool chk_adhoc_ps_mapping = false; + int ret; + struct wmi_tx_meta_v2 meta_v2; + void *meta; + u8 csum_start = 0, csum_dest = 0, csum = skb->ip_summed; + u8 meta_ver = 0; + u32 flags = 0; + + ath6kl_dbg(ATH6KL_DBG_WLAN_TX, + "%s: skb=0x%p, data=0x%p, len=0x%x\n", __func__, + skb, skb->data, skb->len); + + /* If target is not associated */ + if (!test_bit(CONNECTED, &vif->flags)) + goto fail_tx; + + if (WARN_ON_ONCE(ar->state != ATH6KL_STATE_ON)) + goto fail_tx; + + if (!test_bit(WMI_READY, &ar->flag)) + goto fail_tx; + + /* AP mode Power saving processing */ + if (vif->nw_type == AP_NETWORK) { + if (ath6kl_powersave_ap(vif, skb, &flags)) + return 0; + } + + if (test_bit(WMI_ENABLED, &ar->flag)) { + if ((dev->features & NETIF_F_IP_CSUM) && + (csum == CHECKSUM_PARTIAL)) { + csum_start = skb->csum_start - + (skb_network_header(skb) - skb->head) + + sizeof(struct ath6kl_llc_snap_hdr); + csum_dest = skb->csum_offset + csum_start; + } + + if (skb_headroom(skb) < dev->needed_headroom) { + struct sk_buff *tmp_skb = skb; + + skb = skb_realloc_headroom(skb, dev->needed_headroom); + kfree_skb(tmp_skb); + if (skb == NULL) { + vif->net_stats.tx_dropped++; + return 0; + } + } + + if (ath6kl_wmi_dix_2_dot3(ar->wmi, skb)) { + ath6kl_err("ath6kl_wmi_dix_2_dot3 failed\n"); + goto fail_tx; + } + + if ((dev->features & NETIF_F_IP_CSUM) && + (csum == CHECKSUM_PARTIAL)) { + meta_v2.csum_start = csum_start; + meta_v2.csum_dest = csum_dest; + + /* instruct target to calculate checksum */ + meta_v2.csum_flags = WMI_META_V2_FLAG_CSUM_OFFLOAD; + meta_ver = WMI_META_VERSION_2; + meta = &meta_v2; + } else { + meta_ver = 0; + meta = NULL; + } + + ret = ath6kl_wmi_data_hdr_add(ar->wmi, skb, + DATA_MSGTYPE, flags, 0, + meta_ver, + meta, vif->fw_vif_idx); + + if (ret) { + ath6kl_warn("failed to add wmi data header:%d\n" + , ret); + goto fail_tx; + } + + if ((vif->nw_type == ADHOC_NETWORK) && + ar->ibss_ps_enable && test_bit(CONNECTED, &vif->flags)) + chk_adhoc_ps_mapping = true; + else { + /* get the stream mapping */ + ret = ath6kl_wmi_implicit_create_pstream(ar->wmi, + vif->fw_vif_idx, skb, + 0, test_bit(WMM_ENABLED, &vif->flags), &ac); + if (ret) + goto fail_tx; + } + } else { + goto fail_tx; + } + + spin_lock_bh(&ar->lock); + + if (chk_adhoc_ps_mapping) + eid = ath6kl_ibss_map_epid(skb, dev, &map_no); + else + eid = ar->ac2ep_map[ac]; + + if (eid == 0 || eid == ENDPOINT_UNUSED) { + ath6kl_err("eid %d is not mapped!\n", eid); + spin_unlock_bh(&ar->lock); + goto fail_tx; + } + + /* allocate resource for this packet */ + cookie = ath6kl_alloc_cookie(ar); + + if (!cookie) { + spin_unlock_bh(&ar->lock); + goto fail_tx; + } + + /* update counts while the lock is held */ + ar->tx_pending[eid]++; + ar->total_tx_data_pend++; + + spin_unlock_bh(&ar->lock); + + if (!IS_ALIGNED((unsigned long) skb->data - HTC_HDR_LENGTH, 4) && + skb_cloned(skb)) { + /* + * We will touch (move the buffer data to align it. Since the + * skb buffer is cloned and not only the header is changed, we + * have to copy it to allow the changes. Since we are copying + * the data here, we may as well align it by reserving suitable + * headroom to avoid the memmove in ath6kl_htc_tx_buf_align(). + */ + struct sk_buff *nskb; + + nskb = skb_copy_expand(skb, HTC_HDR_LENGTH, 0, GFP_ATOMIC); + if (nskb == NULL) + goto fail_tx; + kfree_skb(skb); + skb = nskb; + } + + cookie->skb = skb; + cookie->map_no = map_no; + set_htc_pkt_info(&cookie->htc_pkt, cookie, skb->data, skb->len, + eid, htc_tag); + cookie->htc_pkt.skb = skb; + + ath6kl_dbg_dump(ATH6KL_DBG_RAW_BYTES, __func__, "tx ", + skb->data, skb->len); + + /* + * HTC interface is asynchronous, if this fails, cleanup will + * happen in the ath6kl_tx_complete callback. + */ + ath6kl_htc_tx(ar->htc_target, &cookie->htc_pkt); + + return 0; + +fail_tx: + dev_kfree_skb(skb); + + vif->net_stats.tx_dropped++; + vif->net_stats.tx_aborted_errors++; + + return 0; +} + +/* indicate tx activity or inactivity on a WMI stream */ +void ath6kl_indicate_tx_activity(void *devt, u8 traffic_class, bool active) +{ + struct ath6kl *ar = devt; + enum htc_endpoint_id eid; + int i; + + eid = ar->ac2ep_map[traffic_class]; + + if (!test_bit(WMI_ENABLED, &ar->flag)) + goto notify_htc; + + spin_lock_bh(&ar->lock); + + ar->ac_stream_active[traffic_class] = active; + + if (active) { + /* + * Keep track of the active stream with the highest + * priority. + */ + if (ar->ac_stream_pri_map[traffic_class] > + ar->hiac_stream_active_pri) + /* set the new highest active priority */ + ar->hiac_stream_active_pri = + ar->ac_stream_pri_map[traffic_class]; + + } else { + /* + * We may have to search for the next active stream + * that is the highest priority. + */ + if (ar->hiac_stream_active_pri == + ar->ac_stream_pri_map[traffic_class]) { + /* + * The highest priority stream just went inactive + * reset and search for the "next" highest "active" + * priority stream. + */ + ar->hiac_stream_active_pri = 0; + + for (i = 0; i < WMM_NUM_AC; i++) { + if (ar->ac_stream_active[i] && + (ar->ac_stream_pri_map[i] > + ar->hiac_stream_active_pri)) + /* + * Set the new highest active + * priority. + */ + ar->hiac_stream_active_pri = + ar->ac_stream_pri_map[i]; + } + } + } + + spin_unlock_bh(&ar->lock); + +notify_htc: + /* notify HTC, this may cause credit distribution changes */ + ath6kl_htc_activity_changed(ar->htc_target, eid, active); +} + +enum htc_send_full_action ath6kl_tx_queue_full(struct htc_target *target, + struct htc_packet *packet) +{ + struct ath6kl *ar = target->dev->ar; + struct ath6kl_vif *vif; + enum htc_endpoint_id endpoint = packet->endpoint; + enum htc_send_full_action action = HTC_SEND_FULL_KEEP; + + if (endpoint == ar->ctrl_ep) { + /* + * Under normal WMI if this is getting full, then something + * is running rampant the host should not be exhausting the + * WMI queue with too many commands the only exception to + * this is during testing using endpointping. + */ + set_bit(WMI_CTRL_EP_FULL, &ar->flag); + ath6kl_err("wmi ctrl ep is full\n"); + ath6kl_recovery_err_notify(ar, ATH6KL_FW_EP_FULL); + return action; + } + + if (packet->info.tx.tag == ATH6KL_CONTROL_PKT_TAG) + return action; + + /* + * The last MAX_HI_COOKIE_NUM "batch" of cookies are reserved for + * the highest active stream. + */ + if (ar->ac_stream_pri_map[ar->ep2ac_map[endpoint]] < + ar->hiac_stream_active_pri && + ar->cookie_count <= + target->endpoint[endpoint].tx_drop_packet_threshold) + /* + * Give preference to the highest priority stream by + * dropping the packets which overflowed. + */ + action = HTC_SEND_FULL_DROP; + + /* FIXME: Locking */ + spin_lock_bh(&ar->list_lock); + list_for_each_entry(vif, &ar->vif_list, list) { + if (vif->nw_type == ADHOC_NETWORK || + action != HTC_SEND_FULL_DROP) { + spin_unlock_bh(&ar->list_lock); + + set_bit(NETQ_STOPPED, &vif->flags); + netif_stop_queue(vif->ndev); + + return action; + } + } + spin_unlock_bh(&ar->list_lock); + + return action; +} + +/* TODO this needs to be looked at */ +static void ath6kl_tx_clear_node_map(struct ath6kl_vif *vif, + enum htc_endpoint_id eid, u32 map_no) +{ + struct ath6kl *ar = vif->ar; + u32 i; + + if (vif->nw_type != ADHOC_NETWORK) + return; + + if (!ar->ibss_ps_enable) + return; + + if (eid == ar->ctrl_ep) + return; + + if (map_no == 0) + return; + + map_no--; + ar->node_map[map_no].tx_pend--; + + if (ar->node_map[map_no].tx_pend) + return; + + if (map_no != (ar->node_num - 1)) + return; + + for (i = ar->node_num; i > 0; i--) { + if (ar->node_map[i - 1].tx_pend) + break; + + memset(&ar->node_map[i - 1], 0, + sizeof(struct ath6kl_node_mapping)); + ar->node_num--; + } +} + +void ath6kl_tx_complete(struct htc_target *target, + struct list_head *packet_queue) +{ + struct ath6kl *ar = target->dev->ar; + struct sk_buff_head skb_queue; + struct htc_packet *packet; + struct sk_buff *skb; + struct ath6kl_cookie *ath6kl_cookie; + u32 map_no = 0; + int status; + enum htc_endpoint_id eid; + bool wake_event = false; + bool flushing[ATH6KL_VIF_MAX] = {false}; + u8 if_idx; + struct ath6kl_vif *vif; + + skb_queue_head_init(&skb_queue); + + /* lock the driver as we update internal state */ + spin_lock_bh(&ar->lock); + + /* reap completed packets */ + while (!list_empty(packet_queue)) { + packet = list_first_entry(packet_queue, struct htc_packet, + list); + list_del(&packet->list); + + if (WARN_ON_ONCE(packet->endpoint == ENDPOINT_UNUSED || + packet->endpoint >= ENDPOINT_MAX)) + continue; + + ath6kl_cookie = (struct ath6kl_cookie *)packet->pkt_cntxt; + if (WARN_ON_ONCE(!ath6kl_cookie)) + continue; + + status = packet->status; + skb = ath6kl_cookie->skb; + eid = packet->endpoint; + map_no = ath6kl_cookie->map_no; + + if (WARN_ON_ONCE(!skb || !skb->data)) { + dev_kfree_skb(skb); + ath6kl_free_cookie(ar, ath6kl_cookie); + continue; + } + + __skb_queue_tail(&skb_queue, skb); + + if (WARN_ON_ONCE(!status && (packet->act_len != skb->len))) { + ath6kl_free_cookie(ar, ath6kl_cookie); + continue; + } + + ar->tx_pending[eid]--; + + if (eid != ar->ctrl_ep) + ar->total_tx_data_pend--; + + if (eid == ar->ctrl_ep) { + if (test_bit(WMI_CTRL_EP_FULL, &ar->flag)) + clear_bit(WMI_CTRL_EP_FULL, &ar->flag); + + if (ar->tx_pending[eid] == 0) + wake_event = true; + } + + if (eid == ar->ctrl_ep) { + if_idx = wmi_cmd_hdr_get_if_idx( + (struct wmi_cmd_hdr *) packet->buf); + } else { + if_idx = wmi_data_hdr_get_if_idx( + (struct wmi_data_hdr *) packet->buf); + } + + vif = ath6kl_get_vif_by_index(ar, if_idx); + if (!vif) { + ath6kl_free_cookie(ar, ath6kl_cookie); + continue; + } + + if (status) { + if (status == -ECANCELED) + /* a packet was flushed */ + flushing[if_idx] = true; + + vif->net_stats.tx_errors++; + + if (status != -ENOSPC && status != -ECANCELED) + ath6kl_warn("tx complete error: %d\n", status); + + ath6kl_dbg(ATH6KL_DBG_WLAN_TX, + "%s: skb=0x%p data=0x%p len=0x%x eid=%d %s\n", + __func__, skb, packet->buf, packet->act_len, + eid, "error!"); + } else { + ath6kl_dbg(ATH6KL_DBG_WLAN_TX, + "%s: skb=0x%p data=0x%p len=0x%x eid=%d %s\n", + __func__, skb, packet->buf, packet->act_len, + eid, "OK"); + + flushing[if_idx] = false; + vif->net_stats.tx_packets++; + vif->net_stats.tx_bytes += skb->len; + } + + ath6kl_tx_clear_node_map(vif, eid, map_no); + + ath6kl_free_cookie(ar, ath6kl_cookie); + + if (test_bit(NETQ_STOPPED, &vif->flags)) + clear_bit(NETQ_STOPPED, &vif->flags); + } + + spin_unlock_bh(&ar->lock); + + __skb_queue_purge(&skb_queue); + + /* FIXME: Locking */ + spin_lock_bh(&ar->list_lock); + list_for_each_entry(vif, &ar->vif_list, list) { + if (test_bit(CONNECTED, &vif->flags) && + !flushing[vif->fw_vif_idx]) { + spin_unlock_bh(&ar->list_lock); + netif_wake_queue(vif->ndev); + spin_lock_bh(&ar->list_lock); + } + } + spin_unlock_bh(&ar->list_lock); + + if (wake_event) + wake_up(&ar->event_wq); + + return; +} + +void ath6kl_tx_data_cleanup(struct ath6kl *ar) +{ + int i; + + /* flush all the data (non-control) streams */ + for (i = 0; i < WMM_NUM_AC; i++) + ath6kl_htc_flush_txep(ar->htc_target, ar->ac2ep_map[i], + ATH6KL_DATA_PKT_TAG); +} + +/* Rx functions */ + +static void ath6kl_deliver_frames_to_nw_stack(struct net_device *dev, + struct sk_buff *skb) +{ + if (!skb) + return; + + skb->dev = dev; + + if (!(skb->dev->flags & IFF_UP)) { + dev_kfree_skb(skb); + return; + } + + skb->protocol = eth_type_trans(skb, skb->dev); + + netif_rx_ni(skb); +} + +static void ath6kl_alloc_netbufs(struct sk_buff_head *q, u16 num) +{ + struct sk_buff *skb; + + while (num) { + skb = ath6kl_buf_alloc(ATH6KL_BUFFER_SIZE); + if (!skb) { + ath6kl_err("netbuf allocation failed\n"); + return; + } + skb_queue_tail(q, skb); + num--; + } +} + +static struct sk_buff *aggr_get_free_skb(struct aggr_info *p_aggr) +{ + struct sk_buff *skb = NULL; + + if (skb_queue_len(&p_aggr->rx_amsdu_freeq) < + (AGGR_NUM_OF_FREE_NETBUFS >> 2)) + ath6kl_alloc_netbufs(&p_aggr->rx_amsdu_freeq, + AGGR_NUM_OF_FREE_NETBUFS); + + skb = skb_dequeue(&p_aggr->rx_amsdu_freeq); + + return skb; +} + +void ath6kl_rx_refill(struct htc_target *target, enum htc_endpoint_id endpoint) +{ + struct ath6kl *ar = target->dev->ar; + struct sk_buff *skb; + int rx_buf; + int n_buf_refill; + struct htc_packet *packet; + struct list_head queue; + + n_buf_refill = ATH6KL_MAX_RX_BUFFERS - + ath6kl_htc_get_rxbuf_num(ar->htc_target, endpoint); + + if (n_buf_refill <= 0) + return; + + INIT_LIST_HEAD(&queue); + + ath6kl_dbg(ATH6KL_DBG_WLAN_RX, + "%s: providing htc with %d buffers at eid=%d\n", + __func__, n_buf_refill, endpoint); + + for (rx_buf = 0; rx_buf < n_buf_refill; rx_buf++) { + skb = ath6kl_buf_alloc(ATH6KL_BUFFER_SIZE); + if (!skb) + break; + + packet = (struct htc_packet *) skb->head; + if (!IS_ALIGNED((unsigned long) skb->data, 4)) { + size_t len = skb_headlen(skb); + skb->data = PTR_ALIGN(skb->data - 4, 4); + skb_set_tail_pointer(skb, len); + } + set_htc_rxpkt_info(packet, skb, skb->data, + ATH6KL_BUFFER_SIZE, endpoint); + packet->skb = skb; + list_add_tail(&packet->list, &queue); + } + + if (!list_empty(&queue)) + ath6kl_htc_add_rxbuf_multiple(ar->htc_target, &queue); +} + +void ath6kl_refill_amsdu_rxbufs(struct ath6kl *ar, int count) +{ + struct htc_packet *packet; + struct sk_buff *skb; + + while (count) { + skb = ath6kl_buf_alloc(ATH6KL_AMSDU_BUFFER_SIZE); + if (!skb) + return; + + packet = (struct htc_packet *) skb->head; + if (!IS_ALIGNED((unsigned long) skb->data, 4)) { + size_t len = skb_headlen(skb); + skb->data = PTR_ALIGN(skb->data - 4, 4); + skb_set_tail_pointer(skb, len); + } + set_htc_rxpkt_info(packet, skb, skb->data, + ATH6KL_AMSDU_BUFFER_SIZE, 0); + packet->skb = skb; + + spin_lock_bh(&ar->lock); + list_add_tail(&packet->list, &ar->amsdu_rx_buffer_queue); + spin_unlock_bh(&ar->lock); + count--; + } +} + +/* + * Callback to allocate a receive buffer for a pending packet. We use a + * pre-allocated list of buffers of maximum AMSDU size (4K). + */ +struct htc_packet *ath6kl_alloc_amsdu_rxbuf(struct htc_target *target, + enum htc_endpoint_id endpoint, + int len) +{ + struct ath6kl *ar = target->dev->ar; + struct htc_packet *packet = NULL; + struct list_head *pkt_pos; + int refill_cnt = 0, depth = 0; + + ath6kl_dbg(ATH6KL_DBG_WLAN_RX, "%s: eid=%d, len:%d\n", + __func__, endpoint, len); + + if ((len <= ATH6KL_BUFFER_SIZE) || + (len > ATH6KL_AMSDU_BUFFER_SIZE)) + return NULL; + + spin_lock_bh(&ar->lock); + + if (list_empty(&ar->amsdu_rx_buffer_queue)) { + spin_unlock_bh(&ar->lock); + refill_cnt = ATH6KL_MAX_AMSDU_RX_BUFFERS; + goto refill_buf; + } + + packet = list_first_entry(&ar->amsdu_rx_buffer_queue, + struct htc_packet, list); + list_del(&packet->list); + list_for_each(pkt_pos, &ar->amsdu_rx_buffer_queue) + depth++; + + refill_cnt = ATH6KL_MAX_AMSDU_RX_BUFFERS - depth; + spin_unlock_bh(&ar->lock); + + /* set actual endpoint ID */ + packet->endpoint = endpoint; + +refill_buf: + if (refill_cnt >= ATH6KL_AMSDU_REFILL_THRESHOLD) + ath6kl_refill_amsdu_rxbufs(ar, refill_cnt); + + return packet; +} + +static void aggr_slice_amsdu(struct aggr_info *p_aggr, + struct rxtid *rxtid, struct sk_buff *skb) +{ + struct sk_buff *new_skb; + struct ethhdr *hdr; + u16 frame_8023_len, payload_8023_len, mac_hdr_len, amsdu_len; + u8 *framep; + + mac_hdr_len = sizeof(struct ethhdr); + framep = skb->data + mac_hdr_len; + amsdu_len = skb->len - mac_hdr_len; + + while (amsdu_len > mac_hdr_len) { + hdr = (struct ethhdr *) framep; + payload_8023_len = ntohs(hdr->h_proto); + + if (payload_8023_len < MIN_MSDU_SUBFRAME_PAYLOAD_LEN || + payload_8023_len > MAX_MSDU_SUBFRAME_PAYLOAD_LEN) { + ath6kl_err("802.3 AMSDU frame bound check failed. len %d\n", + payload_8023_len); + break; + } + + frame_8023_len = payload_8023_len + mac_hdr_len; + new_skb = aggr_get_free_skb(p_aggr); + if (!new_skb) { + ath6kl_err("no buffer available\n"); + break; + } + + memcpy(new_skb->data, framep, frame_8023_len); + skb_put(new_skb, frame_8023_len); + if (ath6kl_wmi_dot3_2_dix(new_skb)) { + ath6kl_err("dot3_2_dix error\n"); + dev_kfree_skb(new_skb); + break; + } + + skb_queue_tail(&rxtid->q, new_skb); + + /* Is this the last subframe within this aggregate ? */ + if ((amsdu_len - frame_8023_len) == 0) + break; + + /* Add the length of A-MSDU subframe padding bytes - + * Round to nearest word. + */ + frame_8023_len = ALIGN(frame_8023_len, 4); + + framep += frame_8023_len; + amsdu_len -= frame_8023_len; + } + + dev_kfree_skb(skb); +} + +static void aggr_deque_frms(struct aggr_info_conn *agg_conn, u8 tid, + u16 seq_no, u8 order) +{ + struct sk_buff *skb; + struct rxtid *rxtid; + struct skb_hold_q *node; + u16 idx, idx_end, seq_end; + struct rxtid_stats *stats; + + rxtid = &agg_conn->rx_tid[tid]; + stats = &agg_conn->stat[tid]; + + spin_lock_bh(&rxtid->lock); + idx = AGGR_WIN_IDX(rxtid->seq_next, rxtid->hold_q_sz); + + /* + * idx_end is typically the last possible frame in the window, + * but changes to 'the' seq_no, when BAR comes. If seq_no + * is non-zero, we will go up to that and stop. + * Note: last seq no in current window will occupy the same + * index position as index that is just previous to start. + * An imp point : if win_sz is 7, for seq_no space of 4095, + * then, there would be holes when sequence wrap around occurs. + * Target should judiciously choose the win_sz, based on + * this condition. For 4095, (TID_WINDOW_SZ = 2 x win_sz + * 2, 4, 8, 16 win_sz works fine). + * We must deque from "idx" to "idx_end", including both. + */ + seq_end = seq_no ? seq_no : rxtid->seq_next; + idx_end = AGGR_WIN_IDX(seq_end, rxtid->hold_q_sz); + + do { + node = &rxtid->hold_q[idx]; + if ((order == 1) && (!node->skb)) + break; + + if (node->skb) { + if (node->is_amsdu) + aggr_slice_amsdu(agg_conn->aggr_info, rxtid, + node->skb); + else + skb_queue_tail(&rxtid->q, node->skb); + node->skb = NULL; + } else { + stats->num_hole++; + } + + rxtid->seq_next = ATH6KL_NEXT_SEQ_NO(rxtid->seq_next); + idx = AGGR_WIN_IDX(rxtid->seq_next, rxtid->hold_q_sz); + } while (idx != idx_end); + + spin_unlock_bh(&rxtid->lock); + + stats->num_delivered += skb_queue_len(&rxtid->q); + + while ((skb = skb_dequeue(&rxtid->q))) + ath6kl_deliver_frames_to_nw_stack(agg_conn->dev, skb); +} + +static bool aggr_process_recv_frm(struct aggr_info_conn *agg_conn, u8 tid, + u16 seq_no, + bool is_amsdu, struct sk_buff *frame) +{ + struct rxtid *rxtid; + struct rxtid_stats *stats; + struct sk_buff *skb; + struct skb_hold_q *node; + u16 idx, st, cur, end; + bool is_queued = false; + u16 extended_end; + + rxtid = &agg_conn->rx_tid[tid]; + stats = &agg_conn->stat[tid]; + + stats->num_into_aggr++; + + if (!rxtid->aggr) { + if (is_amsdu) { + aggr_slice_amsdu(agg_conn->aggr_info, rxtid, frame); + is_queued = true; + stats->num_amsdu++; + while ((skb = skb_dequeue(&rxtid->q))) + ath6kl_deliver_frames_to_nw_stack(agg_conn->dev, + skb); + } + return is_queued; + } + + /* Check the incoming sequence no, if it's in the window */ + st = rxtid->seq_next; + cur = seq_no; + end = (st + rxtid->hold_q_sz-1) & ATH6KL_MAX_SEQ_NO; + + if (((st < end) && (cur < st || cur > end)) || + ((st > end) && (cur > end) && (cur < st))) { + extended_end = (end + rxtid->hold_q_sz - 1) & + ATH6KL_MAX_SEQ_NO; + + if (((end < extended_end) && + (cur < end || cur > extended_end)) || + ((end > extended_end) && (cur > extended_end) && + (cur < end))) { + aggr_deque_frms(agg_conn, tid, 0, 0); + spin_lock_bh(&rxtid->lock); + if (cur >= rxtid->hold_q_sz - 1) + rxtid->seq_next = cur - (rxtid->hold_q_sz - 1); + else + rxtid->seq_next = ATH6KL_MAX_SEQ_NO - + (rxtid->hold_q_sz - 2 - cur); + spin_unlock_bh(&rxtid->lock); + } else { + /* + * Dequeue only those frames that are outside the + * new shifted window. + */ + if (cur >= rxtid->hold_q_sz - 1) + st = cur - (rxtid->hold_q_sz - 1); + else + st = ATH6KL_MAX_SEQ_NO - + (rxtid->hold_q_sz - 2 - cur); + + aggr_deque_frms(agg_conn, tid, st, 0); + } + + stats->num_oow++; + } + + idx = AGGR_WIN_IDX(seq_no, rxtid->hold_q_sz); + + node = &rxtid->hold_q[idx]; + + spin_lock_bh(&rxtid->lock); + + /* + * Is the cur frame duplicate or something beyond our window(hold_q + * -> which is 2x, already)? + * + * 1. Duplicate is easy - drop incoming frame. + * 2. Not falling in current sliding window. + * 2a. is the frame_seq_no preceding current tid_seq_no? + * -> drop the frame. perhaps sender did not get our ACK. + * this is taken care of above. + * 2b. is the frame_seq_no beyond window(st, TID_WINDOW_SZ); + * -> Taken care of it above, by moving window forward. + */ + dev_kfree_skb(node->skb); + stats->num_dups++; + + node->skb = frame; + is_queued = true; + node->is_amsdu = is_amsdu; + node->seq_no = seq_no; + + if (node->is_amsdu) + stats->num_amsdu++; + else + stats->num_mpdu++; + + spin_unlock_bh(&rxtid->lock); + + aggr_deque_frms(agg_conn, tid, 0, 1); + + if (agg_conn->timer_scheduled) + return is_queued; + + spin_lock_bh(&rxtid->lock); + for (idx = 0; idx < rxtid->hold_q_sz; idx++) { + if (rxtid->hold_q[idx].skb) { + /* + * There is a frame in the queue and no + * timer so start a timer to ensure that + * the frame doesn't remain stuck + * forever. + */ + agg_conn->timer_scheduled = true; + mod_timer(&agg_conn->timer, + (jiffies + (HZ * AGGR_RX_TIMEOUT) / 1000)); + rxtid->timer_mon = true; + break; + } + } + spin_unlock_bh(&rxtid->lock); + + return is_queued; +} + +static void ath6kl_uapsd_trigger_frame_rx(struct ath6kl_vif *vif, + struct ath6kl_sta *conn) +{ + struct ath6kl *ar = vif->ar; + bool is_apsdq_empty, is_apsdq_empty_at_start; + u32 num_frames_to_deliver, flags; + struct sk_buff *skb = NULL; + + /* + * If the APSD q for this STA is not empty, dequeue and + * send a pkt from the head of the q. Also update the + * More data bit in the WMI_DATA_HDR if there are + * more pkts for this STA in the APSD q. + * If there are no more pkts for this STA, + * update the APSD bitmap for this STA. + */ + + num_frames_to_deliver = (conn->apsd_info >> ATH6KL_APSD_NUM_OF_AC) & + ATH6KL_APSD_FRAME_MASK; + /* + * Number of frames to send in a service period is + * indicated by the station + * in the QOS_INFO of the association request + * If it is zero, send all frames + */ + if (!num_frames_to_deliver) + num_frames_to_deliver = ATH6KL_APSD_ALL_FRAME; + + spin_lock_bh(&conn->psq_lock); + is_apsdq_empty = skb_queue_empty(&conn->apsdq); + spin_unlock_bh(&conn->psq_lock); + is_apsdq_empty_at_start = is_apsdq_empty; + + while ((!is_apsdq_empty) && (num_frames_to_deliver)) { + spin_lock_bh(&conn->psq_lock); + skb = skb_dequeue(&conn->apsdq); + is_apsdq_empty = skb_queue_empty(&conn->apsdq); + spin_unlock_bh(&conn->psq_lock); + + /* + * Set the STA flag to Trigger delivery, + * so that the frame will go out + */ + conn->sta_flags |= STA_PS_APSD_TRIGGER; + num_frames_to_deliver--; + + /* Last frame in the service period, set EOSP or queue empty */ + if ((is_apsdq_empty) || (!num_frames_to_deliver)) + conn->sta_flags |= STA_PS_APSD_EOSP; + + ath6kl_data_tx(skb, vif->ndev); + conn->sta_flags &= ~(STA_PS_APSD_TRIGGER); + conn->sta_flags &= ~(STA_PS_APSD_EOSP); + } + + if (is_apsdq_empty) { + if (is_apsdq_empty_at_start) + flags = WMI_AP_APSD_NO_DELIVERY_FRAMES; + else + flags = 0; + + ath6kl_wmi_set_apsd_bfrd_traf(ar->wmi, + vif->fw_vif_idx, + conn->aid, 0, flags); + } + + return; +} + +void ath6kl_rx(struct htc_target *target, struct htc_packet *packet) +{ + struct ath6kl *ar = target->dev->ar; + struct sk_buff *skb = packet->pkt_cntxt; + struct wmi_rx_meta_v2 *meta; + struct wmi_data_hdr *dhdr; + int min_hdr_len; + u8 meta_type, dot11_hdr = 0; + u8 pad_before_data_start; + int status = packet->status; + enum htc_endpoint_id ept = packet->endpoint; + bool is_amsdu, prev_ps, ps_state = false; + bool trig_state = false; + struct ath6kl_sta *conn = NULL; + struct sk_buff *skb1 = NULL; + struct ethhdr *datap = NULL; + struct ath6kl_vif *vif; + struct aggr_info_conn *aggr_conn; + u16 seq_no, offset; + u8 tid, if_idx; + + ath6kl_dbg(ATH6KL_DBG_WLAN_RX, + "%s: ar=0x%p eid=%d, skb=0x%p, data=0x%p, len=0x%x status:%d", + __func__, ar, ept, skb, packet->buf, + packet->act_len, status); + + if (status || packet->act_len < HTC_HDR_LENGTH) { + dev_kfree_skb(skb); + return; + } + + skb_put(skb, packet->act_len + HTC_HDR_LENGTH); + skb_pull(skb, HTC_HDR_LENGTH); + + ath6kl_dbg_dump(ATH6KL_DBG_RAW_BYTES, __func__, "rx ", + skb->data, skb->len); + + if (ept == ar->ctrl_ep) { + if (test_bit(WMI_ENABLED, &ar->flag)) { + ath6kl_check_wow_status(ar); + ath6kl_wmi_control_rx(ar->wmi, skb); + return; + } + if_idx = + wmi_cmd_hdr_get_if_idx((struct wmi_cmd_hdr *) skb->data); + } else { + if_idx = + wmi_data_hdr_get_if_idx((struct wmi_data_hdr *) skb->data); + } + + vif = ath6kl_get_vif_by_index(ar, if_idx); + if (!vif) { + dev_kfree_skb(skb); + return; + } + + /* + * Take lock to protect buffer counts and adaptive power throughput + * state. + */ + spin_lock_bh(&vif->if_lock); + + vif->net_stats.rx_packets++; + vif->net_stats.rx_bytes += packet->act_len; + + spin_unlock_bh(&vif->if_lock); + + skb->dev = vif->ndev; + + if (!test_bit(WMI_ENABLED, &ar->flag)) { + if (EPPING_ALIGNMENT_PAD > 0) + skb_pull(skb, EPPING_ALIGNMENT_PAD); + ath6kl_deliver_frames_to_nw_stack(vif->ndev, skb); + return; + } + + ath6kl_check_wow_status(ar); + + min_hdr_len = sizeof(struct ethhdr) + sizeof(struct wmi_data_hdr) + + sizeof(struct ath6kl_llc_snap_hdr); + + dhdr = (struct wmi_data_hdr *) skb->data; + + /* + * In the case of AP mode we may receive NULL data frames + * that do not have LLC hdr. They are 16 bytes in size. + * Allow these frames in the AP mode. + */ + if (vif->nw_type != AP_NETWORK && + ((packet->act_len < min_hdr_len) || + (packet->act_len > WMI_MAX_AMSDU_RX_DATA_FRAME_LENGTH))) { + ath6kl_info("frame len is too short or too long\n"); + vif->net_stats.rx_errors++; + vif->net_stats.rx_length_errors++; + dev_kfree_skb(skb); + return; + } + + /* Get the Power save state of the STA */ + if (vif->nw_type == AP_NETWORK) { + meta_type = wmi_data_hdr_get_meta(dhdr); + + ps_state = !!((dhdr->info >> WMI_DATA_HDR_PS_SHIFT) & + WMI_DATA_HDR_PS_MASK); + + offset = sizeof(struct wmi_data_hdr); + trig_state = !!(le16_to_cpu(dhdr->info3) & WMI_DATA_HDR_TRIG); + + switch (meta_type) { + case 0: + break; + case WMI_META_VERSION_1: + offset += sizeof(struct wmi_rx_meta_v1); + break; + case WMI_META_VERSION_2: + offset += sizeof(struct wmi_rx_meta_v2); + break; + default: + break; + } + + datap = (struct ethhdr *) (skb->data + offset); + conn = ath6kl_find_sta(vif, datap->h_source); + + if (!conn) { + dev_kfree_skb(skb); + return; + } + + /* + * If there is a change in PS state of the STA, + * take appropriate steps: + * + * 1. If Sleep-->Awake, flush the psq for the STA + * Clear the PVB for the STA. + * 2. If Awake-->Sleep, Starting queueing frames + * the STA. + */ + prev_ps = !!(conn->sta_flags & STA_PS_SLEEP); + + if (ps_state) + conn->sta_flags |= STA_PS_SLEEP; + else + conn->sta_flags &= ~STA_PS_SLEEP; + + /* Accept trigger only when the station is in sleep */ + if ((conn->sta_flags & STA_PS_SLEEP) && trig_state) + ath6kl_uapsd_trigger_frame_rx(vif, conn); + + if (prev_ps ^ !!(conn->sta_flags & STA_PS_SLEEP)) { + if (!(conn->sta_flags & STA_PS_SLEEP)) { + struct sk_buff *skbuff = NULL; + bool is_apsdq_empty; + struct ath6kl_mgmt_buff *mgmt; + u8 idx; + + spin_lock_bh(&conn->psq_lock); + while (conn->mgmt_psq_len > 0) { + mgmt = list_first_entry( + &conn->mgmt_psq, + struct ath6kl_mgmt_buff, + list); + list_del(&mgmt->list); + conn->mgmt_psq_len--; + spin_unlock_bh(&conn->psq_lock); + idx = vif->fw_vif_idx; + + ath6kl_wmi_send_mgmt_cmd(ar->wmi, + idx, + mgmt->id, + mgmt->freq, + mgmt->wait, + mgmt->buf, + mgmt->len, + mgmt->no_cck); + + kfree(mgmt); + spin_lock_bh(&conn->psq_lock); + } + conn->mgmt_psq_len = 0; + while ((skbuff = skb_dequeue(&conn->psq))) { + spin_unlock_bh(&conn->psq_lock); + ath6kl_data_tx(skbuff, vif->ndev); + spin_lock_bh(&conn->psq_lock); + } + + is_apsdq_empty = skb_queue_empty(&conn->apsdq); + while ((skbuff = skb_dequeue(&conn->apsdq))) { + spin_unlock_bh(&conn->psq_lock); + ath6kl_data_tx(skbuff, vif->ndev); + spin_lock_bh(&conn->psq_lock); + } + spin_unlock_bh(&conn->psq_lock); + + if (!is_apsdq_empty) + ath6kl_wmi_set_apsd_bfrd_traf( + ar->wmi, + vif->fw_vif_idx, + conn->aid, 0, 0); + + /* Clear the PVB for this STA */ + ath6kl_wmi_set_pvb_cmd(ar->wmi, vif->fw_vif_idx, + conn->aid, 0); + } + } + + /* drop NULL data frames here */ + if ((packet->act_len < min_hdr_len) || + (packet->act_len > + WMI_MAX_AMSDU_RX_DATA_FRAME_LENGTH)) { + dev_kfree_skb(skb); + return; + } + } + + is_amsdu = wmi_data_hdr_is_amsdu(dhdr) ? true : false; + tid = wmi_data_hdr_get_up(dhdr); + seq_no = wmi_data_hdr_get_seqno(dhdr); + meta_type = wmi_data_hdr_get_meta(dhdr); + dot11_hdr = wmi_data_hdr_get_dot11(dhdr); + pad_before_data_start = + (le16_to_cpu(dhdr->info3) >> WMI_DATA_HDR_PAD_BEFORE_DATA_SHIFT) + & WMI_DATA_HDR_PAD_BEFORE_DATA_MASK; + + skb_pull(skb, sizeof(struct wmi_data_hdr)); + + switch (meta_type) { + case WMI_META_VERSION_1: + skb_pull(skb, sizeof(struct wmi_rx_meta_v1)); + break; + case WMI_META_VERSION_2: + meta = (struct wmi_rx_meta_v2 *) skb->data; + if (meta->csum_flags & 0x1) { + skb->ip_summed = CHECKSUM_COMPLETE; + skb->csum = (__force __wsum) meta->csum; + } + skb_pull(skb, sizeof(struct wmi_rx_meta_v2)); + break; + default: + break; + } + + skb_pull(skb, pad_before_data_start); + + if (dot11_hdr) + status = ath6kl_wmi_dot11_hdr_remove(ar->wmi, skb); + else if (!is_amsdu) + status = ath6kl_wmi_dot3_2_dix(skb); + + if (status) { + /* + * Drop frames that could not be processed (lack of + * memory, etc.) + */ + dev_kfree_skb(skb); + return; + } + + if (!(vif->ndev->flags & IFF_UP)) { + dev_kfree_skb(skb); + return; + } + + if (vif->nw_type == AP_NETWORK) { + datap = (struct ethhdr *) skb->data; + if (is_multicast_ether_addr(datap->h_dest)) + /* + * Bcast/Mcast frames should be sent to the + * OS stack as well as on the air. + */ + skb1 = skb_copy(skb, GFP_ATOMIC); + else { + /* + * Search for a connected STA with dstMac + * as the Mac address. If found send the + * frame to it on the air else send the + * frame up the stack. + */ + conn = ath6kl_find_sta(vif, datap->h_dest); + + if (conn && ar->intra_bss) { + skb1 = skb; + skb = NULL; + } else if (conn && !ar->intra_bss) { + dev_kfree_skb(skb); + skb = NULL; + } + } + if (skb1) + ath6kl_data_tx(skb1, vif->ndev); + + if (skb == NULL) { + /* nothing to deliver up the stack */ + return; + } + } + + datap = (struct ethhdr *) skb->data; + + if (is_unicast_ether_addr(datap->h_dest)) { + if (vif->nw_type == AP_NETWORK) { + conn = ath6kl_find_sta(vif, datap->h_source); + if (!conn) + return; + aggr_conn = conn->aggr_conn; + } else { + aggr_conn = vif->aggr_cntxt->aggr_conn; + } + + if (aggr_process_recv_frm(aggr_conn, tid, seq_no, + is_amsdu, skb)) { + /* aggregation code will handle the skb */ + return; + } + } else if (!is_broadcast_ether_addr(datap->h_dest)) { + vif->net_stats.multicast++; + } + + ath6kl_deliver_frames_to_nw_stack(vif->ndev, skb); +} + +static void aggr_timeout(unsigned long arg) +{ + u8 i, j; + struct aggr_info_conn *aggr_conn = (struct aggr_info_conn *) arg; + struct rxtid *rxtid; + struct rxtid_stats *stats; + + for (i = 0; i < NUM_OF_TIDS; i++) { + rxtid = &aggr_conn->rx_tid[i]; + stats = &aggr_conn->stat[i]; + + if (!rxtid->aggr || !rxtid->timer_mon) + continue; + + stats->num_timeouts++; + ath6kl_dbg(ATH6KL_DBG_AGGR, + "aggr timeout (st %d end %d)\n", + rxtid->seq_next, + ((rxtid->seq_next + rxtid->hold_q_sz-1) & + ATH6KL_MAX_SEQ_NO)); + aggr_deque_frms(aggr_conn, i, 0, 0); + } + + aggr_conn->timer_scheduled = false; + + for (i = 0; i < NUM_OF_TIDS; i++) { + rxtid = &aggr_conn->rx_tid[i]; + + if (rxtid->aggr && rxtid->hold_q) { + spin_lock_bh(&rxtid->lock); + for (j = 0; j < rxtid->hold_q_sz; j++) { + if (rxtid->hold_q[j].skb) { + aggr_conn->timer_scheduled = true; + rxtid->timer_mon = true; + break; + } + } + spin_unlock_bh(&rxtid->lock); + + if (j >= rxtid->hold_q_sz) + rxtid->timer_mon = false; + } + } + + if (aggr_conn->timer_scheduled) + mod_timer(&aggr_conn->timer, + jiffies + msecs_to_jiffies(AGGR_RX_TIMEOUT)); +} + +static void aggr_delete_tid_state(struct aggr_info_conn *aggr_conn, u8 tid) +{ + struct rxtid *rxtid; + struct rxtid_stats *stats; + + if (!aggr_conn || tid >= NUM_OF_TIDS) + return; + + rxtid = &aggr_conn->rx_tid[tid]; + stats = &aggr_conn->stat[tid]; + + if (rxtid->aggr) + aggr_deque_frms(aggr_conn, tid, 0, 0); + + rxtid->aggr = false; + rxtid->timer_mon = false; + rxtid->win_sz = 0; + rxtid->seq_next = 0; + rxtid->hold_q_sz = 0; + + kfree(rxtid->hold_q); + rxtid->hold_q = NULL; + + memset(stats, 0, sizeof(struct rxtid_stats)); +} + +void aggr_recv_addba_req_evt(struct ath6kl_vif *vif, u8 tid_mux, u16 seq_no, + u8 win_sz) +{ + struct ath6kl_sta *sta; + struct aggr_info_conn *aggr_conn = NULL; + struct rxtid *rxtid; + struct rxtid_stats *stats; + u16 hold_q_size; + u8 tid, aid; + + if (vif->nw_type == AP_NETWORK) { + aid = ath6kl_get_aid(tid_mux); + sta = ath6kl_find_sta_by_aid(vif->ar, aid); + if (sta) + aggr_conn = sta->aggr_conn; + } else { + aggr_conn = vif->aggr_cntxt->aggr_conn; + } + + if (!aggr_conn) + return; + + tid = ath6kl_get_tid(tid_mux); + if (tid >= NUM_OF_TIDS) + return; + + rxtid = &aggr_conn->rx_tid[tid]; + stats = &aggr_conn->stat[tid]; + + if (win_sz < AGGR_WIN_SZ_MIN || win_sz > AGGR_WIN_SZ_MAX) + ath6kl_dbg(ATH6KL_DBG_WLAN_RX, "%s: win_sz %d, tid %d\n", + __func__, win_sz, tid); + + if (rxtid->aggr) + aggr_delete_tid_state(aggr_conn, tid); + + rxtid->seq_next = seq_no; + hold_q_size = TID_WINDOW_SZ(win_sz) * sizeof(struct skb_hold_q); + rxtid->hold_q = kzalloc(hold_q_size, GFP_KERNEL); + if (!rxtid->hold_q) + return; + + rxtid->win_sz = win_sz; + rxtid->hold_q_sz = TID_WINDOW_SZ(win_sz); + if (!skb_queue_empty(&rxtid->q)) + return; + + rxtid->aggr = true; +} + +void aggr_conn_init(struct ath6kl_vif *vif, struct aggr_info *aggr_info, + struct aggr_info_conn *aggr_conn) +{ + struct rxtid *rxtid; + u8 i; + + aggr_conn->aggr_sz = AGGR_SZ_DEFAULT; + aggr_conn->dev = vif->ndev; + init_timer(&aggr_conn->timer); + aggr_conn->timer.function = aggr_timeout; + aggr_conn->timer.data = (unsigned long) aggr_conn; + aggr_conn->aggr_info = aggr_info; + + aggr_conn->timer_scheduled = false; + + for (i = 0; i < NUM_OF_TIDS; i++) { + rxtid = &aggr_conn->rx_tid[i]; + rxtid->aggr = false; + rxtid->timer_mon = false; + skb_queue_head_init(&rxtid->q); + spin_lock_init(&rxtid->lock); + } +} + +struct aggr_info *aggr_init(struct ath6kl_vif *vif) +{ + struct aggr_info *p_aggr = NULL; + + p_aggr = kzalloc(sizeof(struct aggr_info), GFP_KERNEL); + if (!p_aggr) { + ath6kl_err("failed to alloc memory for aggr_node\n"); + return NULL; + } + + p_aggr->aggr_conn = kzalloc(sizeof(struct aggr_info_conn), GFP_KERNEL); + if (!p_aggr->aggr_conn) { + ath6kl_err("failed to alloc memory for connection specific aggr info\n"); + kfree(p_aggr); + return NULL; + } + + aggr_conn_init(vif, p_aggr, p_aggr->aggr_conn); + + skb_queue_head_init(&p_aggr->rx_amsdu_freeq); + ath6kl_alloc_netbufs(&p_aggr->rx_amsdu_freeq, AGGR_NUM_OF_FREE_NETBUFS); + + return p_aggr; +} + +void aggr_recv_delba_req_evt(struct ath6kl_vif *vif, u8 tid_mux) +{ + struct ath6kl_sta *sta; + struct rxtid *rxtid; + struct aggr_info_conn *aggr_conn = NULL; + u8 tid, aid; + + if (vif->nw_type == AP_NETWORK) { + aid = ath6kl_get_aid(tid_mux); + sta = ath6kl_find_sta_by_aid(vif->ar, aid); + if (sta) + aggr_conn = sta->aggr_conn; + } else { + aggr_conn = vif->aggr_cntxt->aggr_conn; + } + + if (!aggr_conn) + return; + + tid = ath6kl_get_tid(tid_mux); + if (tid >= NUM_OF_TIDS) + return; + + rxtid = &aggr_conn->rx_tid[tid]; + + if (rxtid->aggr) + aggr_delete_tid_state(aggr_conn, tid); +} + +void aggr_reset_state(struct aggr_info_conn *aggr_conn) +{ + u8 tid; + + if (!aggr_conn) + return; + + if (aggr_conn->timer_scheduled) { + del_timer(&aggr_conn->timer); + aggr_conn->timer_scheduled = false; + } + + for (tid = 0; tid < NUM_OF_TIDS; tid++) + aggr_delete_tid_state(aggr_conn, tid); +} + +/* clean up our amsdu buffer list */ +void ath6kl_cleanup_amsdu_rxbufs(struct ath6kl *ar) +{ + struct htc_packet *packet, *tmp_pkt; + + spin_lock_bh(&ar->lock); + if (list_empty(&ar->amsdu_rx_buffer_queue)) { + spin_unlock_bh(&ar->lock); + return; + } + + list_for_each_entry_safe(packet, tmp_pkt, &ar->amsdu_rx_buffer_queue, + list) { + list_del(&packet->list); + spin_unlock_bh(&ar->lock); + dev_kfree_skb(packet->pkt_cntxt); + spin_lock_bh(&ar->lock); + } + + spin_unlock_bh(&ar->lock); +} + +void aggr_module_destroy(struct aggr_info *aggr_info) +{ + if (!aggr_info) + return; + + aggr_reset_state(aggr_info->aggr_conn); + skb_queue_purge(&aggr_info->rx_amsdu_freeq); + kfree(aggr_info->aggr_conn); + kfree(aggr_info); +} |