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/*
* Copyright (c) 2013 Eugene Krasnikov <k.eugene.e@gmail.com>
*
* 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 "txrx.h"
static inline int get_rssi0(struct wcn36xx_rx_bd *bd)
{
return 100 - ((bd->phy_stat0 >> 24) & 0xff);
}
int wcn36xx_rx_skb(struct wcn36xx *wcn, struct sk_buff *skb)
{
struct ieee80211_rx_status status;
struct ieee80211_hdr *hdr;
struct wcn36xx_rx_bd *bd;
u16 fc, sn;
/*
* All fields must be 0, otherwise it can lead to
* unexpected consequences.
*/
memset(&status, 0, sizeof(status));
bd = (struct wcn36xx_rx_bd *)skb->data;
buff_to_be((u32 *)bd, sizeof(*bd)/sizeof(u32));
wcn36xx_dbg_dump(WCN36XX_DBG_RX_DUMP,
"BD <<< ", (char *)bd,
sizeof(struct wcn36xx_rx_bd));
skb_put(skb, bd->pdu.mpdu_header_off + bd->pdu.mpdu_len);
skb_pull(skb, bd->pdu.mpdu_header_off);
status.mactime = 10;
status.freq = WCN36XX_CENTER_FREQ(wcn);
status.band = WCN36XX_BAND(wcn);
status.signal = -get_rssi0(bd);
status.antenna = 1;
status.rate_idx = 1;
status.flag = 0;
status.rx_flags = 0;
status.flag |= RX_FLAG_IV_STRIPPED |
RX_FLAG_MMIC_STRIPPED |
RX_FLAG_DECRYPTED;
wcn36xx_dbg(WCN36XX_DBG_RX, "status.flags=%x status->vendor_radiotap_len=%x\n",
status.flag, status.vendor_radiotap_len);
memcpy(IEEE80211_SKB_RXCB(skb), &status, sizeof(status));
hdr = (struct ieee80211_hdr *) skb->data;
fc = __le16_to_cpu(hdr->frame_control);
sn = IEEE80211_SEQ_TO_SN(__le16_to_cpu(hdr->seq_ctrl));
if (ieee80211_is_beacon(hdr->frame_control)) {
wcn36xx_dbg(WCN36XX_DBG_BEACON, "beacon skb %p len %d fc %04x sn %d\n",
skb, skb->len, fc, sn);
wcn36xx_dbg_dump(WCN36XX_DBG_BEACON_DUMP, "SKB <<< ",
(char *)skb->data, skb->len);
} else {
wcn36xx_dbg(WCN36XX_DBG_RX, "rx skb %p len %d fc %04x sn %d\n",
skb, skb->len, fc, sn);
wcn36xx_dbg_dump(WCN36XX_DBG_RX_DUMP, "SKB <<< ",
(char *)skb->data, skb->len);
}
ieee80211_rx_irqsafe(wcn->hw, skb);
return 0;
}
static void wcn36xx_set_tx_pdu(struct wcn36xx_tx_bd *bd,
u32 mpdu_header_len,
u32 len,
u16 tid)
{
bd->pdu.mpdu_header_len = mpdu_header_len;
bd->pdu.mpdu_header_off = sizeof(*bd);
bd->pdu.mpdu_data_off = bd->pdu.mpdu_header_len +
bd->pdu.mpdu_header_off;
bd->pdu.mpdu_len = len;
bd->pdu.tid = tid;
}
static inline struct wcn36xx_vif *get_vif_by_addr(struct wcn36xx *wcn,
u8 *addr)
{
struct wcn36xx_vif *vif_priv = NULL;
struct ieee80211_vif *vif = NULL;
list_for_each_entry(vif_priv, &wcn->vif_list, list) {
vif = container_of((void *)vif_priv,
struct ieee80211_vif,
drv_priv);
if (memcmp(vif->addr, addr, ETH_ALEN) == 0)
return vif_priv;
}
wcn36xx_warn("vif %pM not found\n", addr);
return NULL;
}
static void wcn36xx_set_tx_data(struct wcn36xx_tx_bd *bd,
struct wcn36xx *wcn,
struct wcn36xx_vif **vif_priv,
struct wcn36xx_sta *sta_priv,
struct ieee80211_hdr *hdr,
bool bcast)
{
struct ieee80211_vif *vif = NULL;
struct wcn36xx_vif *__vif_priv = NULL;
bd->bd_rate = WCN36XX_BD_RATE_DATA;
/*
* For not unicast frames mac80211 will not set sta pointer so use
* self_sta_index instead.
*/
if (sta_priv) {
__vif_priv = sta_priv->vif;
vif = container_of((void *)__vif_priv,
struct ieee80211_vif,
drv_priv);
if (vif->type == NL80211_IFTYPE_STATION) {
bd->sta_index = sta_priv->bss_sta_index;
bd->dpu_desc_idx = sta_priv->bss_dpu_desc_index;
} else if (vif->type == NL80211_IFTYPE_AP ||
vif->type == NL80211_IFTYPE_ADHOC ||
vif->type == NL80211_IFTYPE_MESH_POINT) {
bd->sta_index = sta_priv->sta_index;
bd->dpu_desc_idx = sta_priv->dpu_desc_index;
}
} else {
__vif_priv = get_vif_by_addr(wcn, hdr->addr2);
bd->sta_index = __vif_priv->self_sta_index;
bd->dpu_desc_idx = __vif_priv->self_dpu_desc_index;
}
bd->dpu_sign = __vif_priv->ucast_dpu_signature;
if (ieee80211_is_nullfunc(hdr->frame_control) ||
(sta_priv && !sta_priv->is_data_encrypted))
bd->dpu_ne = 1;
if (bcast) {
bd->ub = 1;
bd->ack_policy = 1;
}
*vif_priv = __vif_priv;
}
static void wcn36xx_set_tx_mgmt(struct wcn36xx_tx_bd *bd,
struct wcn36xx *wcn,
struct wcn36xx_vif **vif_priv,
struct ieee80211_hdr *hdr,
bool bcast)
{
struct wcn36xx_vif *__vif_priv =
get_vif_by_addr(wcn, hdr->addr2);
bd->sta_index = __vif_priv->self_sta_index;
bd->dpu_desc_idx = __vif_priv->self_dpu_desc_index;
bd->dpu_ne = 1;
/* default rate for unicast */
if (ieee80211_is_mgmt(hdr->frame_control))
bd->bd_rate = (WCN36XX_BAND(wcn) == IEEE80211_BAND_5GHZ) ?
WCN36XX_BD_RATE_CTRL :
WCN36XX_BD_RATE_MGMT;
else if (ieee80211_is_ctl(hdr->frame_control))
bd->bd_rate = WCN36XX_BD_RATE_CTRL;
else
wcn36xx_warn("frame control type unknown\n");
/*
* In joining state trick hardware that probe is sent as
* unicast even if address is broadcast.
*/
if (__vif_priv->is_joining &&
ieee80211_is_probe_req(hdr->frame_control))
bcast = false;
if (bcast) {
/* broadcast */
bd->ub = 1;
/* No ack needed not unicast */
bd->ack_policy = 1;
bd->queue_id = WCN36XX_TX_B_WQ_ID;
} else
bd->queue_id = WCN36XX_TX_U_WQ_ID;
*vif_priv = __vif_priv;
}
int wcn36xx_start_tx(struct wcn36xx *wcn,
struct wcn36xx_sta *sta_priv,
struct sk_buff *skb)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
struct wcn36xx_vif *vif_priv = NULL;
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
unsigned long flags;
bool is_low = ieee80211_is_data(hdr->frame_control);
bool bcast = is_broadcast_ether_addr(hdr->addr1) ||
is_multicast_ether_addr(hdr->addr1);
struct wcn36xx_tx_bd *bd = wcn36xx_dxe_get_next_bd(wcn, is_low);
if (!bd) {
/*
* TX DXE are used in pairs. One for the BD and one for the
* actual frame. The BD DXE's has a preallocated buffer while
* the skb ones does not. If this isn't true something is really
* wierd. TODO: Recover from this situation
*/
wcn36xx_err("bd address may not be NULL for BD DXE\n");
return -EINVAL;
}
memset(bd, 0, sizeof(*bd));
wcn36xx_dbg(WCN36XX_DBG_TX,
"tx skb %p len %d fc %04x sn %d %s %s\n",
skb, skb->len, __le16_to_cpu(hdr->frame_control),
IEEE80211_SEQ_TO_SN(__le16_to_cpu(hdr->seq_ctrl)),
is_low ? "low" : "high", bcast ? "bcast" : "ucast");
wcn36xx_dbg_dump(WCN36XX_DBG_TX_DUMP, "", skb->data, skb->len);
bd->dpu_rf = WCN36XX_BMU_WQ_TX;
bd->tx_comp = info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS;
if (bd->tx_comp) {
wcn36xx_dbg(WCN36XX_DBG_DXE, "TX_ACK status requested\n");
spin_lock_irqsave(&wcn->dxe_lock, flags);
if (wcn->tx_ack_skb) {
spin_unlock_irqrestore(&wcn->dxe_lock, flags);
wcn36xx_warn("tx_ack_skb already set\n");
return -EINVAL;
}
wcn->tx_ack_skb = skb;
spin_unlock_irqrestore(&wcn->dxe_lock, flags);
/* Only one at a time is supported by fw. Stop the TX queues
* until the ack status gets back.
*
* TODO: Add watchdog in case FW does not answer
*/
ieee80211_stop_queues(wcn->hw);
}
/* Data frames served first*/
if (is_low) {
wcn36xx_set_tx_data(bd, wcn, &vif_priv, sta_priv, hdr, bcast);
wcn36xx_set_tx_pdu(bd,
ieee80211_is_data_qos(hdr->frame_control) ?
sizeof(struct ieee80211_qos_hdr) :
sizeof(struct ieee80211_hdr_3addr),
skb->len, sta_priv ? sta_priv->tid : 0);
} else {
/* MGMT and CTRL frames are handeld here*/
wcn36xx_set_tx_mgmt(bd, wcn, &vif_priv, hdr, bcast);
wcn36xx_set_tx_pdu(bd,
ieee80211_is_data_qos(hdr->frame_control) ?
sizeof(struct ieee80211_qos_hdr) :
sizeof(struct ieee80211_hdr_3addr),
skb->len, WCN36XX_TID);
}
buff_to_be((u32 *)bd, sizeof(*bd)/sizeof(u32));
bd->tx_bd_sign = 0xbdbdbdbd;
return wcn36xx_dxe_tx_frame(wcn, vif_priv, skb, is_low);
}
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