--- /dev/null
+/*
+ * 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);
+}
Code Review / kvmfornfv.git / blobdiff