417 lines
12 KiB
C
417 lines
12 KiB
C
/*
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* Marvell Wireless LAN device driver: AP TX and RX data handling
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*
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* Copyright (C) 2012, Marvell International Ltd.
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*
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* This software file (the "File") is distributed by Marvell International
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* Ltd. under the terms of the GNU General Public License Version 2, June 1991
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* (the "License"). You may use, redistribute and/or modify this File in
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* accordance with the terms and conditions of the License, a copy of which
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* is available by writing to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
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* worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
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*
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* THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
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* ARE EXPRESSLY DISCLAIMED. The License provides additional details about
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* this warranty disclaimer.
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*/
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#include "decl.h"
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#include "ioctl.h"
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#include "main.h"
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#include "wmm.h"
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#include "11n_aggr.h"
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#include "11n_rxreorder.h"
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/* This function checks if particular RA list has packets more than low bridge
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* packet threshold and then deletes packet from this RA list.
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* Function deletes packets from such RA list and returns true. If no such list
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* is found, false is returned.
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*/
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static bool
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mwifiex_uap_del_tx_pkts_in_ralist(struct mwifiex_private *priv,
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struct list_head *ra_list_head)
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{
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struct mwifiex_ra_list_tbl *ra_list;
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struct sk_buff *skb, *tmp;
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bool pkt_deleted = false;
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struct mwifiex_txinfo *tx_info;
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struct mwifiex_adapter *adapter = priv->adapter;
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list_for_each_entry(ra_list, ra_list_head, list) {
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if (skb_queue_empty(&ra_list->skb_head))
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continue;
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skb_queue_walk_safe(&ra_list->skb_head, skb, tmp) {
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tx_info = MWIFIEX_SKB_TXCB(skb);
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if (tx_info->flags & MWIFIEX_BUF_FLAG_BRIDGED_PKT) {
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__skb_unlink(skb, &ra_list->skb_head);
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mwifiex_write_data_complete(adapter, skb, 0,
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-1);
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atomic_dec(&priv->wmm.tx_pkts_queued);
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pkt_deleted = true;
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}
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if ((atomic_read(&adapter->pending_bridged_pkts) <=
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MWIFIEX_BRIDGED_PKTS_THR_LOW))
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break;
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}
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}
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return pkt_deleted;
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}
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/* This function deletes packets from particular RA List. RA list index
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* from which packets are deleted is preserved so that packets from next RA
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* list are deleted upon subsequent call thus maintaining fairness.
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*/
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static void mwifiex_uap_cleanup_tx_queues(struct mwifiex_private *priv)
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{
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unsigned long flags;
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struct list_head *ra_list;
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int i;
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spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
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for (i = 0; i < MAX_NUM_TID; i++, priv->del_list_idx++) {
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if (priv->del_list_idx == MAX_NUM_TID)
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priv->del_list_idx = 0;
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ra_list = &priv->wmm.tid_tbl_ptr[priv->del_list_idx].ra_list;
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if (mwifiex_uap_del_tx_pkts_in_ralist(priv, ra_list)) {
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priv->del_list_idx++;
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break;
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}
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}
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spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
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}
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static void mwifiex_uap_queue_bridged_pkt(struct mwifiex_private *priv,
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struct sk_buff *skb)
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{
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struct mwifiex_adapter *adapter = priv->adapter;
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struct uap_rxpd *uap_rx_pd;
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struct rx_packet_hdr *rx_pkt_hdr;
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struct sk_buff *new_skb;
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struct mwifiex_txinfo *tx_info;
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int hdr_chop;
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struct timeval tv;
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struct ethhdr *p_ethhdr;
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u8 rfc1042_eth_hdr[ETH_ALEN] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
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uap_rx_pd = (struct uap_rxpd *)(skb->data);
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rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset);
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if ((atomic_read(&adapter->pending_bridged_pkts) >=
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MWIFIEX_BRIDGED_PKTS_THR_HIGH)) {
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dev_err(priv->adapter->dev,
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"Tx: Bridge packet limit reached. Drop packet!\n");
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kfree_skb(skb);
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mwifiex_uap_cleanup_tx_queues(priv);
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return;
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}
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if (!memcmp(&rx_pkt_hdr->rfc1042_hdr,
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rfc1042_eth_hdr, sizeof(rfc1042_eth_hdr))) {
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/* Replace the 803 header and rfc1042 header (llc/snap) with
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* an Ethernet II header, keep the src/dst and snap_type
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* (ethertype).
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*
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* The firmware only passes up SNAP frames converting all RX
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* data from 802.11 to 802.2/LLC/SNAP frames.
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*
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* To create the Ethernet II, just move the src, dst address
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* right before the snap_type.
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*/
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p_ethhdr = (struct ethhdr *)
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((u8 *)(&rx_pkt_hdr->eth803_hdr)
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+ sizeof(rx_pkt_hdr->eth803_hdr)
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+ sizeof(rx_pkt_hdr->rfc1042_hdr)
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- sizeof(rx_pkt_hdr->eth803_hdr.h_dest)
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- sizeof(rx_pkt_hdr->eth803_hdr.h_source)
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- sizeof(rx_pkt_hdr->rfc1042_hdr.snap_type));
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memcpy(p_ethhdr->h_source, rx_pkt_hdr->eth803_hdr.h_source,
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sizeof(p_ethhdr->h_source));
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memcpy(p_ethhdr->h_dest, rx_pkt_hdr->eth803_hdr.h_dest,
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sizeof(p_ethhdr->h_dest));
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/* Chop off the rxpd + the excess memory from
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* 802.2/llc/snap header that was removed.
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*/
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hdr_chop = (u8 *)p_ethhdr - (u8 *)uap_rx_pd;
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} else {
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/* Chop off the rxpd */
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hdr_chop = (u8 *)&rx_pkt_hdr->eth803_hdr - (u8 *)uap_rx_pd;
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}
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/* Chop off the leading header bytes so the it points
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* to the start of either the reconstructed EthII frame
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* or the 802.2/llc/snap frame.
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*/
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skb_pull(skb, hdr_chop);
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if (skb_headroom(skb) < MWIFIEX_MIN_DATA_HEADER_LEN) {
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dev_dbg(priv->adapter->dev,
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"data: Tx: insufficient skb headroom %d\n",
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skb_headroom(skb));
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/* Insufficient skb headroom - allocate a new skb */
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new_skb =
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skb_realloc_headroom(skb, MWIFIEX_MIN_DATA_HEADER_LEN);
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if (unlikely(!new_skb)) {
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dev_err(priv->adapter->dev,
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"Tx: cannot allocate new_skb\n");
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kfree_skb(skb);
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priv->stats.tx_dropped++;
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return;
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}
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kfree_skb(skb);
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skb = new_skb;
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dev_dbg(priv->adapter->dev, "info: new skb headroom %d\n",
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skb_headroom(skb));
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}
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tx_info = MWIFIEX_SKB_TXCB(skb);
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tx_info->bss_num = priv->bss_num;
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tx_info->bss_type = priv->bss_type;
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tx_info->flags |= MWIFIEX_BUF_FLAG_BRIDGED_PKT;
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do_gettimeofday(&tv);
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skb->tstamp = timeval_to_ktime(tv);
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mwifiex_wmm_add_buf_txqueue(priv, skb);
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atomic_inc(&adapter->tx_pending);
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atomic_inc(&adapter->pending_bridged_pkts);
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return;
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}
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/*
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* This function contains logic for AP packet forwarding.
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*
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* If a packet is multicast/broadcast, it is sent to kernel/upper layer
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* as well as queued back to AP TX queue so that it can be sent to other
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* associated stations.
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* If a packet is unicast and RA is present in associated station list,
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* it is again requeued into AP TX queue.
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* If a packet is unicast and RA is not in associated station list,
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* packet is forwarded to kernel to handle routing logic.
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*/
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int mwifiex_handle_uap_rx_forward(struct mwifiex_private *priv,
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struct sk_buff *skb)
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{
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struct mwifiex_adapter *adapter = priv->adapter;
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struct uap_rxpd *uap_rx_pd;
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struct rx_packet_hdr *rx_pkt_hdr;
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u8 ra[ETH_ALEN];
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struct sk_buff *skb_uap;
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uap_rx_pd = (struct uap_rxpd *)(skb->data);
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rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset);
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/* don't do packet forwarding in disconnected state */
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if (!priv->media_connected) {
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dev_err(adapter->dev, "drop packet in disconnected state.\n");
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dev_kfree_skb_any(skb);
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return 0;
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}
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memcpy(ra, rx_pkt_hdr->eth803_hdr.h_dest, ETH_ALEN);
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if (is_multicast_ether_addr(ra)) {
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skb_uap = skb_copy(skb, GFP_ATOMIC);
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mwifiex_uap_queue_bridged_pkt(priv, skb_uap);
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} else {
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if (mwifiex_get_sta_entry(priv, ra)) {
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/* Requeue Intra-BSS packet */
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mwifiex_uap_queue_bridged_pkt(priv, skb);
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return 0;
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}
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}
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/* Forward unicat/Inter-BSS packets to kernel. */
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return mwifiex_process_rx_packet(priv, skb);
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}
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/*
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* This function processes the packet received on AP interface.
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*
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* The function looks into the RxPD and performs sanity tests on the
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* received buffer to ensure its a valid packet before processing it
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* further. If the packet is determined to be aggregated, it is
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* de-aggregated accordingly. Then skb is passed to AP packet forwarding logic.
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*
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* The completion callback is called after processing is complete.
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*/
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int mwifiex_process_uap_rx_packet(struct mwifiex_private *priv,
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struct sk_buff *skb)
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{
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struct mwifiex_adapter *adapter = priv->adapter;
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int ret;
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struct uap_rxpd *uap_rx_pd;
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struct rx_packet_hdr *rx_pkt_hdr;
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u16 rx_pkt_type;
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u8 ta[ETH_ALEN], pkt_type;
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struct mwifiex_sta_node *node;
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uap_rx_pd = (struct uap_rxpd *)(skb->data);
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rx_pkt_type = le16_to_cpu(uap_rx_pd->rx_pkt_type);
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rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset);
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if ((le16_to_cpu(uap_rx_pd->rx_pkt_offset) +
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le16_to_cpu(uap_rx_pd->rx_pkt_length)) > (u16) skb->len) {
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dev_err(adapter->dev,
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"wrong rx packet: len=%d, offset=%d, length=%d\n",
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skb->len, le16_to_cpu(uap_rx_pd->rx_pkt_offset),
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le16_to_cpu(uap_rx_pd->rx_pkt_length));
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priv->stats.rx_dropped++;
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if (adapter->if_ops.data_complete)
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adapter->if_ops.data_complete(adapter, skb);
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else
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dev_kfree_skb_any(skb);
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return 0;
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}
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if (le16_to_cpu(uap_rx_pd->rx_pkt_type) == PKT_TYPE_AMSDU) {
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struct sk_buff_head list;
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struct sk_buff *rx_skb;
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__skb_queue_head_init(&list);
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skb_pull(skb, le16_to_cpu(uap_rx_pd->rx_pkt_offset));
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skb_trim(skb, le16_to_cpu(uap_rx_pd->rx_pkt_length));
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ieee80211_amsdu_to_8023s(skb, &list, priv->curr_addr,
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priv->wdev->iftype, 0, false);
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while (!skb_queue_empty(&list)) {
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rx_skb = __skb_dequeue(&list);
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ret = mwifiex_recv_packet(priv, rx_skb);
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if (ret)
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dev_err(adapter->dev,
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"AP:Rx A-MSDU failed");
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}
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return 0;
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} else if (rx_pkt_type == PKT_TYPE_MGMT) {
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ret = mwifiex_process_mgmt_packet(priv, skb);
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if (ret)
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dev_err(adapter->dev, "Rx of mgmt packet failed");
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dev_kfree_skb_any(skb);
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return ret;
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}
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memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN);
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if (rx_pkt_type != PKT_TYPE_BAR && uap_rx_pd->priority < MAX_NUM_TID) {
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node = mwifiex_get_sta_entry(priv, ta);
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if (node)
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node->rx_seq[uap_rx_pd->priority] =
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le16_to_cpu(uap_rx_pd->seq_num);
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}
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if (!priv->ap_11n_enabled ||
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(!mwifiex_11n_get_rx_reorder_tbl(priv, uap_rx_pd->priority, ta) &&
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(le16_to_cpu(uap_rx_pd->rx_pkt_type) != PKT_TYPE_AMSDU))) {
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ret = mwifiex_handle_uap_rx_forward(priv, skb);
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return ret;
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}
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/* Reorder and send to kernel */
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pkt_type = (u8)le16_to_cpu(uap_rx_pd->rx_pkt_type);
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ret = mwifiex_11n_rx_reorder_pkt(priv, le16_to_cpu(uap_rx_pd->seq_num),
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uap_rx_pd->priority, ta, pkt_type,
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skb);
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if (ret || (rx_pkt_type == PKT_TYPE_BAR)) {
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if (adapter->if_ops.data_complete)
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adapter->if_ops.data_complete(adapter, skb);
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else
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dev_kfree_skb_any(skb);
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}
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if (ret)
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priv->stats.rx_dropped++;
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return ret;
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}
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/*
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* This function fills the TxPD for AP tx packets.
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*
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* The Tx buffer received by this function should already have the
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* header space allocated for TxPD.
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*
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* This function inserts the TxPD in between interface header and actual
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* data and adjusts the buffer pointers accordingly.
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*
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* The following TxPD fields are set by this function, as required -
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* - BSS number
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* - Tx packet length and offset
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* - Priority
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* - Packet delay
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* - Priority specific Tx control
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* - Flags
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*/
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void *mwifiex_process_uap_txpd(struct mwifiex_private *priv,
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struct sk_buff *skb)
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{
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struct mwifiex_adapter *adapter = priv->adapter;
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struct uap_txpd *txpd;
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struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb);
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int pad, len;
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u16 pkt_type;
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if (!skb->len) {
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dev_err(adapter->dev, "Tx: bad packet length: %d\n", skb->len);
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tx_info->status_code = -1;
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return skb->data;
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}
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pkt_type = mwifiex_is_skb_mgmt_frame(skb) ? PKT_TYPE_MGMT : 0;
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/* If skb->data is not aligned, add padding */
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pad = (4 - (((void *)skb->data - NULL) & 0x3)) % 4;
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len = sizeof(*txpd) + pad;
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BUG_ON(skb_headroom(skb) < len + INTF_HEADER_LEN);
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skb_push(skb, len);
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txpd = (struct uap_txpd *)skb->data;
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memset(txpd, 0, sizeof(*txpd));
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txpd->bss_num = priv->bss_num;
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txpd->bss_type = priv->bss_type;
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txpd->tx_pkt_length = cpu_to_le16((u16)(skb->len - len));
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txpd->priority = (u8)skb->priority;
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txpd->pkt_delay_2ms = mwifiex_wmm_compute_drv_pkt_delay(priv, skb);
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if (txpd->priority < ARRAY_SIZE(priv->wmm.user_pri_pkt_tx_ctrl))
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/*
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* Set the priority specific tx_control field, setting of 0 will
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* cause the default value to be used later in this function.
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*/
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txpd->tx_control =
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cpu_to_le32(priv->wmm.user_pri_pkt_tx_ctrl[txpd->priority]);
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/* Offset of actual data */
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if (pkt_type == PKT_TYPE_MGMT) {
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/* Set the packet type and add header for management frame */
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txpd->tx_pkt_type = cpu_to_le16(pkt_type);
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len += MWIFIEX_MGMT_FRAME_HEADER_SIZE;
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}
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txpd->tx_pkt_offset = cpu_to_le16(len);
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/* make space for INTF_HEADER_LEN */
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skb_push(skb, INTF_HEADER_LEN);
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if (!txpd->tx_control)
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/* TxCtrl set by user or default */
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txpd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);
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return skb->data;
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}
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