2 * Marvell Wireless LAN device driver: AP TX and RX data handling
4 * Copyright (C) 2012, Marvell International Ltd.
6 * This software file (the "File") is distributed by Marvell International
7 * Ltd. under the terms of the GNU General Public License Version 2, June 1991
8 * (the "License"). You may use, redistribute and/or modify this File in
9 * accordance with the terms and conditions of the License, a copy of which
10 * is available by writing to the Free Software Foundation, Inc.,
11 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
12 * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
14 * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
16 * ARE EXPRESSLY DISCLAIMED. The License provides additional details about
17 * this warranty disclaimer.
25 #include "11n_rxreorder.h"
27 static void mwifiex_uap_queue_bridged_pkt(struct mwifiex_private *priv,
30 struct mwifiex_adapter *adapter = priv->adapter;
31 struct uap_rxpd *uap_rx_pd;
32 struct rx_packet_hdr *rx_pkt_hdr;
33 struct sk_buff *new_skb;
34 struct mwifiex_txinfo *tx_info;
37 u8 rfc1042_eth_hdr[ETH_ALEN] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
39 uap_rx_pd = (struct uap_rxpd *)(skb->data);
40 rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset);
42 if ((atomic_read(&adapter->pending_bridged_pkts) >=
43 MWIFIEX_BRIDGED_PKTS_THRESHOLD)) {
44 dev_err(priv->adapter->dev,
45 "Tx: Bridge packet limit reached. Drop packet!\n");
50 if (!memcmp(&rx_pkt_hdr->rfc1042_hdr,
51 rfc1042_eth_hdr, sizeof(rfc1042_eth_hdr)))
52 /* Chop off the rxpd + the excess memory from
53 * 802.2/llc/snap header that was removed.
55 hdr_chop = (u8 *)eth_hdr - (u8 *)uap_rx_pd;
57 /* Chop off the rxpd */
58 hdr_chop = (u8 *)&rx_pkt_hdr->eth803_hdr - (u8 *)uap_rx_pd;
60 /* Chop off the leading header bytes so the it points
61 * to the start of either the reconstructed EthII frame
62 * or the 802.2/llc/snap frame.
64 skb_pull(skb, hdr_chop);
66 if (skb_headroom(skb) < MWIFIEX_MIN_DATA_HEADER_LEN) {
67 dev_dbg(priv->adapter->dev,
68 "data: Tx: insufficient skb headroom %d\n",
70 /* Insufficient skb headroom - allocate a new skb */
72 skb_realloc_headroom(skb, MWIFIEX_MIN_DATA_HEADER_LEN);
73 if (unlikely(!new_skb)) {
74 dev_err(priv->adapter->dev,
75 "Tx: cannot allocate new_skb\n");
77 priv->stats.tx_dropped++;
83 dev_dbg(priv->adapter->dev, "info: new skb headroom %d\n",
87 tx_info = MWIFIEX_SKB_TXCB(skb);
88 tx_info->bss_num = priv->bss_num;
89 tx_info->bss_type = priv->bss_type;
90 tx_info->flags |= MWIFIEX_BUF_FLAG_BRIDGED_PKT;
93 skb->tstamp = timeval_to_ktime(tv);
94 mwifiex_wmm_add_buf_txqueue(priv, skb);
95 atomic_inc(&adapter->tx_pending);
96 atomic_inc(&adapter->pending_bridged_pkts);
102 * This function contains logic for AP packet forwarding.
104 * If a packet is multicast/broadcast, it is sent to kernel/upper layer
105 * as well as queued back to AP TX queue so that it can be sent to other
106 * associated stations.
107 * If a packet is unicast and RA is present in associated station list,
108 * it is again requeued into AP TX queue.
109 * If a packet is unicast and RA is not in associated station list,
110 * packet is forwarded to kernel to handle routing logic.
112 int mwifiex_handle_uap_rx_forward(struct mwifiex_private *priv,
115 struct mwifiex_adapter *adapter = priv->adapter;
116 struct uap_rxpd *uap_rx_pd;
117 struct rx_packet_hdr *rx_pkt_hdr;
119 struct sk_buff *skb_uap;
121 uap_rx_pd = (struct uap_rxpd *)(skb->data);
122 rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset);
124 /* don't do packet forwarding in disconnected state */
125 if (!priv->media_connected) {
126 dev_err(adapter->dev, "drop packet in disconnected state.\n");
127 dev_kfree_skb_any(skb);
131 memcpy(ra, rx_pkt_hdr->eth803_hdr.h_dest, ETH_ALEN);
133 if (is_multicast_ether_addr(ra)) {
134 skb_uap = skb_copy(skb, GFP_ATOMIC);
135 mwifiex_uap_queue_bridged_pkt(priv, skb_uap);
137 if (mwifiex_get_sta_entry(priv, ra)) {
138 /* Requeue Intra-BSS packet */
139 mwifiex_uap_queue_bridged_pkt(priv, skb);
144 /* Forward unicat/Inter-BSS packets to kernel. */
145 return mwifiex_process_rx_packet(priv, skb);
149 * This function processes the packet received on AP interface.
151 * The function looks into the RxPD and performs sanity tests on the
152 * received buffer to ensure its a valid packet before processing it
153 * further. If the packet is determined to be aggregated, it is
154 * de-aggregated accordingly. Then skb is passed to AP packet forwarding logic.
156 * The completion callback is called after processing is complete.
158 int mwifiex_process_uap_rx_packet(struct mwifiex_private *priv,
161 struct mwifiex_adapter *adapter = priv->adapter;
163 struct uap_rxpd *uap_rx_pd;
164 struct rx_packet_hdr *rx_pkt_hdr;
166 u8 ta[ETH_ALEN], pkt_type;
167 struct mwifiex_sta_node *node;
169 uap_rx_pd = (struct uap_rxpd *)(skb->data);
170 rx_pkt_type = le16_to_cpu(uap_rx_pd->rx_pkt_type);
171 rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset);
173 if ((le16_to_cpu(uap_rx_pd->rx_pkt_offset) +
174 le16_to_cpu(uap_rx_pd->rx_pkt_length)) > (u16) skb->len) {
175 dev_err(adapter->dev,
176 "wrong rx packet: len=%d, offset=%d, length=%d\n",
177 skb->len, le16_to_cpu(uap_rx_pd->rx_pkt_offset),
178 le16_to_cpu(uap_rx_pd->rx_pkt_length));
179 priv->stats.rx_dropped++;
181 if (adapter->if_ops.data_complete)
182 adapter->if_ops.data_complete(adapter, skb);
184 dev_kfree_skb_any(skb);
189 if (le16_to_cpu(uap_rx_pd->rx_pkt_type) == PKT_TYPE_AMSDU) {
190 struct sk_buff_head list;
191 struct sk_buff *rx_skb;
193 __skb_queue_head_init(&list);
194 skb_pull(skb, le16_to_cpu(uap_rx_pd->rx_pkt_offset));
195 skb_trim(skb, le16_to_cpu(uap_rx_pd->rx_pkt_length));
197 ieee80211_amsdu_to_8023s(skb, &list, priv->curr_addr,
198 priv->wdev->iftype, 0, false);
200 while (!skb_queue_empty(&list)) {
201 rx_skb = __skb_dequeue(&list);
202 ret = mwifiex_recv_packet(priv, rx_skb);
204 dev_err(adapter->dev,
205 "AP:Rx A-MSDU failed");
209 } else if (rx_pkt_type == PKT_TYPE_MGMT) {
210 ret = mwifiex_process_mgmt_packet(priv, skb);
212 dev_err(adapter->dev, "Rx of mgmt packet failed");
213 dev_kfree_skb_any(skb);
217 memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN);
219 if (rx_pkt_type != PKT_TYPE_BAR && uap_rx_pd->priority < MAX_NUM_TID) {
220 node = mwifiex_get_sta_entry(priv, ta);
222 node->rx_seq[uap_rx_pd->priority] =
223 le16_to_cpu(uap_rx_pd->seq_num);
226 if (!priv->ap_11n_enabled ||
227 (!mwifiex_11n_get_rx_reorder_tbl(priv, uap_rx_pd->priority, ta) &&
228 (le16_to_cpu(uap_rx_pd->rx_pkt_type) != PKT_TYPE_AMSDU))) {
229 ret = mwifiex_handle_uap_rx_forward(priv, skb);
233 /* Reorder and send to kernel */
234 pkt_type = (u8)le16_to_cpu(uap_rx_pd->rx_pkt_type);
235 ret = mwifiex_11n_rx_reorder_pkt(priv, le16_to_cpu(uap_rx_pd->seq_num),
236 uap_rx_pd->priority, ta, pkt_type,
239 if (ret || (rx_pkt_type == PKT_TYPE_BAR)) {
240 if (adapter->if_ops.data_complete)
241 adapter->if_ops.data_complete(adapter, skb);
243 dev_kfree_skb_any(skb);
247 priv->stats.rx_dropped++;
253 * This function fills the TxPD for AP tx packets.
255 * The Tx buffer received by this function should already have the
256 * header space allocated for TxPD.
258 * This function inserts the TxPD in between interface header and actual
259 * data and adjusts the buffer pointers accordingly.
261 * The following TxPD fields are set by this function, as required -
263 * - Tx packet length and offset
266 * - Priority specific Tx control
269 void *mwifiex_process_uap_txpd(struct mwifiex_private *priv,
272 struct mwifiex_adapter *adapter = priv->adapter;
273 struct uap_txpd *txpd;
274 struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb);
279 dev_err(adapter->dev, "Tx: bad packet length: %d\n", skb->len);
280 tx_info->status_code = -1;
284 pkt_type = mwifiex_is_skb_mgmt_frame(skb) ? PKT_TYPE_MGMT : 0;
286 /* If skb->data is not aligned, add padding */
287 pad = (4 - (((void *)skb->data - NULL) & 0x3)) % 4;
289 len = sizeof(*txpd) + pad;
291 BUG_ON(skb_headroom(skb) < len + INTF_HEADER_LEN);
295 txpd = (struct uap_txpd *)skb->data;
296 memset(txpd, 0, sizeof(*txpd));
297 txpd->bss_num = priv->bss_num;
298 txpd->bss_type = priv->bss_type;
299 txpd->tx_pkt_length = cpu_to_le16((u16)(skb->len - len));
301 txpd->priority = (u8)skb->priority;
302 txpd->pkt_delay_2ms = mwifiex_wmm_compute_drv_pkt_delay(priv, skb);
304 if (txpd->priority < ARRAY_SIZE(priv->wmm.user_pri_pkt_tx_ctrl))
306 * Set the priority specific tx_control field, setting of 0 will
307 * cause the default value to be used later in this function.
310 cpu_to_le32(priv->wmm.user_pri_pkt_tx_ctrl[txpd->priority]);
312 /* Offset of actual data */
313 if (pkt_type == PKT_TYPE_MGMT) {
314 /* Set the packet type and add header for management frame */
315 txpd->tx_pkt_type = cpu_to_le16(pkt_type);
316 len += MWIFIEX_MGMT_FRAME_HEADER_SIZE;
319 txpd->tx_pkt_offset = cpu_to_le16(len);
321 /* make space for INTF_HEADER_LEN */
322 skb_push(skb, INTF_HEADER_LEN);
324 if (!txpd->tx_control)
325 /* TxCtrl set by user or default */
326 txpd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);