Return-path: Received: from mail-la0-f50.google.com ([209.85.215.50]:41703 "EHLO mail-la0-f50.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755305Ab3HWI7k (ORCPT ); Fri, 23 Aug 2013 04:59:40 -0400 Received: by mail-la0-f50.google.com with SMTP id es20so179534lab.23 for ; Fri, 23 Aug 2013 01:59:38 -0700 (PDT) From: Eugene Krasnikov To: linux-wireless@vger.kernel.org Cc: wcn36xx@lists.infradead.org, Eugene Krasnikov Subject: [PATCH v2 11/16] wcn36xx: add txrx.c Date: Fri, 23 Aug 2013 10:58:14 +0200 Message-Id: <1377248299-21007-12-git-send-email-k.eugene.e@gmail.com> (sfid-20130823_105959_507534_1FB12ABA) In-Reply-To: <1377248299-21007-1-git-send-email-k.eugene.e@gmail.com> References: <1377248299-21007-1-git-send-email-k.eugene.e@gmail.com> Sender: linux-wireless-owner@vger.kernel.org List-ID: Adding txrx.c Signed-off-by: Eugene Krasnikov --- drivers/net/wireless/ath/wcn36xx/txrx.c | 256 ++++++++++++++++++++++++++++++++ 1 file changed, 256 insertions(+) create mode 100644 drivers/net/wireless/ath/wcn36xx/txrx.c diff --git a/drivers/net/wireless/ath/wcn36xx/txrx.c b/drivers/net/wireless/ath/wcn36xx/txrx.c new file mode 100644 index 0000000..f49ec20 --- /dev/null +++ b/drivers/net/wireless/ath/wcn36xx/txrx.c @@ -0,0 +1,256 @@ +/* + * Copyright (c) 2013 Eugene Krasnikov + * + * 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 void wcn36xx_set_tx_data(struct wcn36xx_tx_bd *bd, + struct wcn36xx *wcn, + struct wcn36xx_sta *sta_priv, + struct ieee80211_hdr *hdr, + bool bcast) +{ + struct ieee80211_vif *vif = container_of((void *)wcn->current_vif, + struct ieee80211_vif, + drv_priv); + bd->bd_rate = WCN36XX_BD_RATE_DATA; + bd->dpu_sign = wcn->current_vif->ucast_dpu_signature; + + /* + * For not unicast frames mac80211 will not set sta pointer so use + * self_sta_index instead. + */ + if (sta_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 { + bd->sta_index = wcn->current_vif->self_sta_index; + bd->dpu_desc_idx = wcn->current_vif->self_dpu_desc_index; + } + + 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; + } +} + +static void wcn36xx_set_tx_mgmt(struct wcn36xx_tx_bd *bd, + struct wcn36xx *wcn, + struct ieee80211_hdr *hdr, + bool bcast) +{ + bd->sta_index = wcn->current_vif->self_sta_index; + bd->dpu_desc_idx = wcn->current_vif->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 (wcn->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; +} + +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 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, 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, 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, skb, is_low); +} -- 1.8.2.2