| /* |
| * Marvell Wireless LAN device driver: AP TX and RX data handling |
| * |
| * Copyright (C) 2012, Marvell International Ltd. |
| * |
| * This software file (the "File") is distributed by Marvell International |
| * Ltd. under the terms of the GNU General Public License Version 2, June 1991 |
| * (the "License"). You may use, redistribute and/or modify this File in |
| * accordance with the terms and conditions of the License, a copy of which |
| * is available by writing to the Free Software Foundation, Inc., |
| * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the |
| * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt. |
| * |
| * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE |
| * ARE EXPRESSLY DISCLAIMED. The License provides additional details about |
| * this warranty disclaimer. |
| */ |
| |
| #include "decl.h" |
| #include "ioctl.h" |
| #include "main.h" |
| #include "wmm.h" |
| #include "11n_aggr.h" |
| #include "11n_rxreorder.h" |
| |
| static void mwifiex_uap_queue_bridged_pkt(struct mwifiex_private *priv, |
| struct sk_buff *skb) |
| { |
| struct mwifiex_adapter *adapter = priv->adapter; |
| struct uap_rxpd *uap_rx_pd; |
| struct rx_packet_hdr *rx_pkt_hdr; |
| struct sk_buff *new_skb; |
| struct mwifiex_txinfo *tx_info; |
| int hdr_chop; |
| struct timeval tv; |
| u8 rfc1042_eth_hdr[ETH_ALEN] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 }; |
| |
| uap_rx_pd = (struct uap_rxpd *)(skb->data); |
| rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset); |
| |
| if ((atomic_read(&adapter->pending_bridged_pkts) >= |
| MWIFIEX_BRIDGED_PKTS_THRESHOLD)) { |
| dev_err(priv->adapter->dev, |
| "Tx: Bridge packet limit reached. Drop packet!\n"); |
| kfree_skb(skb); |
| return; |
| } |
| |
| if (!memcmp(&rx_pkt_hdr->rfc1042_hdr, |
| rfc1042_eth_hdr, sizeof(rfc1042_eth_hdr))) |
| /* Chop off the rxpd + the excess memory from |
| * 802.2/llc/snap header that was removed. |
| */ |
| hdr_chop = (u8 *)eth_hdr - (u8 *)uap_rx_pd; |
| else |
| /* Chop off the rxpd */ |
| hdr_chop = (u8 *)&rx_pkt_hdr->eth803_hdr - (u8 *)uap_rx_pd; |
| |
| /* Chop off the leading header bytes so the it points |
| * to the start of either the reconstructed EthII frame |
| * or the 802.2/llc/snap frame. |
| */ |
| skb_pull(skb, hdr_chop); |
| |
| if (skb_headroom(skb) < MWIFIEX_MIN_DATA_HEADER_LEN) { |
| dev_dbg(priv->adapter->dev, |
| "data: Tx: insufficient skb headroom %d\n", |
| skb_headroom(skb)); |
| /* Insufficient skb headroom - allocate a new skb */ |
| new_skb = |
| skb_realloc_headroom(skb, MWIFIEX_MIN_DATA_HEADER_LEN); |
| if (unlikely(!new_skb)) { |
| dev_err(priv->adapter->dev, |
| "Tx: cannot allocate new_skb\n"); |
| kfree_skb(skb); |
| priv->stats.tx_dropped++; |
| return; |
| } |
| |
| kfree_skb(skb); |
| skb = new_skb; |
| dev_dbg(priv->adapter->dev, "info: new skb headroom %d\n", |
| skb_headroom(skb)); |
| } |
| |
| tx_info = MWIFIEX_SKB_TXCB(skb); |
| tx_info->bss_num = priv->bss_num; |
| tx_info->bss_type = priv->bss_type; |
| tx_info->flags |= MWIFIEX_BUF_FLAG_BRIDGED_PKT; |
| |
| do_gettimeofday(&tv); |
| skb->tstamp = timeval_to_ktime(tv); |
| mwifiex_wmm_add_buf_txqueue(priv, skb); |
| atomic_inc(&adapter->tx_pending); |
| atomic_inc(&adapter->pending_bridged_pkts); |
| |
| return; |
| } |
| |
| /* |
| * This function contains logic for AP packet forwarding. |
| * |
| * If a packet is multicast/broadcast, it is sent to kernel/upper layer |
| * as well as queued back to AP TX queue so that it can be sent to other |
| * associated stations. |
| * If a packet is unicast and RA is present in associated station list, |
| * it is again requeued into AP TX queue. |
| * If a packet is unicast and RA is not in associated station list, |
| * packet is forwarded to kernel to handle routing logic. |
| */ |
| int mwifiex_handle_uap_rx_forward(struct mwifiex_private *priv, |
| struct sk_buff *skb) |
| { |
| struct mwifiex_adapter *adapter = priv->adapter; |
| struct uap_rxpd *uap_rx_pd; |
| struct rx_packet_hdr *rx_pkt_hdr; |
| u8 ra[ETH_ALEN]; |
| struct sk_buff *skb_uap; |
| |
| uap_rx_pd = (struct uap_rxpd *)(skb->data); |
| rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset); |
| |
| /* don't do packet forwarding in disconnected state */ |
| if (!priv->media_connected) { |
| dev_err(adapter->dev, "drop packet in disconnected state.\n"); |
| dev_kfree_skb_any(skb); |
| return 0; |
| } |
| |
| memcpy(ra, rx_pkt_hdr->eth803_hdr.h_dest, ETH_ALEN); |
| |
| if (is_multicast_ether_addr(ra)) { |
| skb_uap = skb_copy(skb, GFP_ATOMIC); |
| mwifiex_uap_queue_bridged_pkt(priv, skb_uap); |
| } else { |
| if (mwifiex_get_sta_entry(priv, ra)) { |
| /* Requeue Intra-BSS packet */ |
| mwifiex_uap_queue_bridged_pkt(priv, skb); |
| return 0; |
| } |
| } |
| |
| /* Forward unicat/Inter-BSS packets to kernel. */ |
| return mwifiex_process_rx_packet(priv, skb); |
| } |
| |
| /* |
| * This function processes the packet received on AP interface. |
| * |
| * The function looks into the RxPD and performs sanity tests on the |
| * received buffer to ensure its a valid packet before processing it |
| * further. If the packet is determined to be aggregated, it is |
| * de-aggregated accordingly. Then skb is passed to AP packet forwarding logic. |
| * |
| * The completion callback is called after processing is complete. |
| */ |
| int mwifiex_process_uap_rx_packet(struct mwifiex_private *priv, |
| struct sk_buff *skb) |
| { |
| struct mwifiex_adapter *adapter = priv->adapter; |
| int ret; |
| struct uap_rxpd *uap_rx_pd; |
| struct rx_packet_hdr *rx_pkt_hdr; |
| u16 rx_pkt_type; |
| u8 ta[ETH_ALEN], pkt_type; |
| struct mwifiex_sta_node *node; |
| |
| uap_rx_pd = (struct uap_rxpd *)(skb->data); |
| rx_pkt_type = le16_to_cpu(uap_rx_pd->rx_pkt_type); |
| rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset); |
| |
| if ((le16_to_cpu(uap_rx_pd->rx_pkt_offset) + |
| le16_to_cpu(uap_rx_pd->rx_pkt_length)) > (u16) skb->len) { |
| dev_err(adapter->dev, |
| "wrong rx packet: len=%d, offset=%d, length=%d\n", |
| skb->len, le16_to_cpu(uap_rx_pd->rx_pkt_offset), |
| le16_to_cpu(uap_rx_pd->rx_pkt_length)); |
| priv->stats.rx_dropped++; |
| |
| if (adapter->if_ops.data_complete) |
| adapter->if_ops.data_complete(adapter, skb); |
| else |
| dev_kfree_skb_any(skb); |
| |
| return 0; |
| } |
| |
| if (le16_to_cpu(uap_rx_pd->rx_pkt_type) == PKT_TYPE_AMSDU) { |
| struct sk_buff_head list; |
| struct sk_buff *rx_skb; |
| |
| __skb_queue_head_init(&list); |
| skb_pull(skb, le16_to_cpu(uap_rx_pd->rx_pkt_offset)); |
| skb_trim(skb, le16_to_cpu(uap_rx_pd->rx_pkt_length)); |
| |
| ieee80211_amsdu_to_8023s(skb, &list, priv->curr_addr, |
| priv->wdev->iftype, 0, false); |
| |
| while (!skb_queue_empty(&list)) { |
| rx_skb = __skb_dequeue(&list); |
| ret = mwifiex_recv_packet(priv, rx_skb); |
| if (ret) |
| dev_err(adapter->dev, |
| "AP:Rx A-MSDU failed"); |
| } |
| |
| return 0; |
| } else if (rx_pkt_type == PKT_TYPE_MGMT) { |
| ret = mwifiex_process_mgmt_packet(priv, skb); |
| if (ret) |
| dev_err(adapter->dev, "Rx of mgmt packet failed"); |
| dev_kfree_skb_any(skb); |
| return ret; |
| } |
| |
| memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN); |
| |
| if (rx_pkt_type != PKT_TYPE_BAR && uap_rx_pd->priority < MAX_NUM_TID) { |
| node = mwifiex_get_sta_entry(priv, ta); |
| if (node) |
| node->rx_seq[uap_rx_pd->priority] = |
| le16_to_cpu(uap_rx_pd->seq_num); |
| } |
| |
| if (!priv->ap_11n_enabled || |
| (!mwifiex_11n_get_rx_reorder_tbl(priv, uap_rx_pd->priority, ta) && |
| (le16_to_cpu(uap_rx_pd->rx_pkt_type) != PKT_TYPE_AMSDU))) { |
| ret = mwifiex_handle_uap_rx_forward(priv, skb); |
| return ret; |
| } |
| |
| /* Reorder and send to kernel */ |
| pkt_type = (u8)le16_to_cpu(uap_rx_pd->rx_pkt_type); |
| ret = mwifiex_11n_rx_reorder_pkt(priv, le16_to_cpu(uap_rx_pd->seq_num), |
| uap_rx_pd->priority, ta, pkt_type, |
| skb); |
| |
| if (ret || (rx_pkt_type == PKT_TYPE_BAR)) { |
| if (adapter->if_ops.data_complete) |
| adapter->if_ops.data_complete(adapter, skb); |
| else |
| dev_kfree_skb_any(skb); |
| } |
| |
| if (ret) |
| priv->stats.rx_dropped++; |
| |
| return ret; |
| } |
| |
| /* |
| * This function fills the TxPD for AP tx packets. |
| * |
| * The Tx buffer received by this function should already have the |
| * header space allocated for TxPD. |
| * |
| * This function inserts the TxPD in between interface header and actual |
| * data and adjusts the buffer pointers accordingly. |
| * |
| * The following TxPD fields are set by this function, as required - |
| * - BSS number |
| * - Tx packet length and offset |
| * - Priority |
| * - Packet delay |
| * - Priority specific Tx control |
| * - Flags |
| */ |
| void *mwifiex_process_uap_txpd(struct mwifiex_private *priv, |
| struct sk_buff *skb) |
| { |
| struct mwifiex_adapter *adapter = priv->adapter; |
| struct uap_txpd *txpd; |
| struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb); |
| int pad, len; |
| u16 pkt_type; |
| |
| if (!skb->len) { |
| dev_err(adapter->dev, "Tx: bad packet length: %d\n", skb->len); |
| tx_info->status_code = -1; |
| return skb->data; |
| } |
| |
| pkt_type = mwifiex_is_skb_mgmt_frame(skb) ? PKT_TYPE_MGMT : 0; |
| |
| /* If skb->data is not aligned, add padding */ |
| pad = (4 - (((void *)skb->data - NULL) & 0x3)) % 4; |
| |
| len = sizeof(*txpd) + pad; |
| |
| BUG_ON(skb_headroom(skb) < len + INTF_HEADER_LEN); |
| |
| skb_push(skb, len); |
| |
| txpd = (struct uap_txpd *)skb->data; |
| memset(txpd, 0, sizeof(*txpd)); |
| txpd->bss_num = priv->bss_num; |
| txpd->bss_type = priv->bss_type; |
| txpd->tx_pkt_length = cpu_to_le16((u16)(skb->len - len)); |
| |
| txpd->priority = (u8)skb->priority; |
| txpd->pkt_delay_2ms = mwifiex_wmm_compute_drv_pkt_delay(priv, skb); |
| |
| if (txpd->priority < ARRAY_SIZE(priv->wmm.user_pri_pkt_tx_ctrl)) |
| /* |
| * Set the priority specific tx_control field, setting of 0 will |
| * cause the default value to be used later in this function. |
| */ |
| txpd->tx_control = |
| cpu_to_le32(priv->wmm.user_pri_pkt_tx_ctrl[txpd->priority]); |
| |
| /* Offset of actual data */ |
| if (pkt_type == PKT_TYPE_MGMT) { |
| /* Set the packet type and add header for management frame */ |
| txpd->tx_pkt_type = cpu_to_le16(pkt_type); |
| len += MWIFIEX_MGMT_FRAME_HEADER_SIZE; |
| } |
| |
| txpd->tx_pkt_offset = cpu_to_le16(len); |
| |
| /* make space for INTF_HEADER_LEN */ |
| skb_push(skb, INTF_HEADER_LEN); |
| |
| if (!txpd->tx_control) |
| /* TxCtrl set by user or default */ |
| txpd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl); |
| |
| return skb->data; |
| } |