xref: /openbmc/linux/drivers/staging/rtl8723bs/hal/rtl8723bs_recv.c (revision c146ae45)

// SPDX-License-Identifier: GPL-2.0
/******************************************************************************
 *
 * Copyright(c) 2007 - 2012 Realtek Corporation. All rights reserved.
 *
 ******************************************************************************/

#include <drv_types.h>
#include <rtw_debug.h>
#include <rtl8723b_hal.h>

static void initrecvbuf(struct recv_buf *precvbuf, struct adapter *padapter)
{
	INIT_LIST_HEAD(&precvbuf->list);
	spin_lock_init(&precvbuf->recvbuf_lock);

	precvbuf->adapter = padapter;
}

static void update_recvframe_attrib(struct adapter *padapter,
				    union recv_frame *precvframe,
				    struct recv_stat *prxstat)
{
	struct rx_pkt_attrib *pattrib;
	struct recv_stat report;
	struct rxreport_8723b *prxreport = (struct rxreport_8723b *)&report;

	report.rxdw0 = prxstat->rxdw0;
	report.rxdw1 = prxstat->rxdw1;
	report.rxdw2 = prxstat->rxdw2;
	report.rxdw3 = prxstat->rxdw3;
	report.rxdw4 = prxstat->rxdw4;
	report.rxdw5 = prxstat->rxdw5;

	pattrib = &precvframe->u.hdr.attrib;
	memset(pattrib, 0, sizeof(struct rx_pkt_attrib));

	/*  update rx report to recv_frame attribute */
	pattrib->pkt_rpt_type = prxreport->c2h_ind ? C2H_PACKET : NORMAL_RX;

	if (pattrib->pkt_rpt_type == NORMAL_RX) {
		/*  Normal rx packet */
		/*  update rx report to recv_frame attribute */
		pattrib->pkt_len = (u16)prxreport->pktlen;
		pattrib->drvinfo_sz = (u8)(prxreport->drvinfosize << 3);
		pattrib->physt = (u8)prxreport->physt;

		pattrib->crc_err = (u8)prxreport->crc32;
		pattrib->icv_err = (u8)prxreport->icverr;

		pattrib->bdecrypted = (u8)(prxreport->swdec ? 0 : 1);
		pattrib->encrypt = (u8)prxreport->security;

		pattrib->qos = (u8)prxreport->qos;
		pattrib->priority = (u8)prxreport->tid;

		pattrib->amsdu = (u8)prxreport->amsdu;

		pattrib->seq_num = (u16)prxreport->seq;
		pattrib->frag_num = (u8)prxreport->frag;
		pattrib->mfrag = (u8)prxreport->mf;
		pattrib->mdata = (u8)prxreport->md;

		pattrib->data_rate = (u8)prxreport->rx_rate;
	} else {
		pattrib->pkt_len = (u16)prxreport->pktlen;
	}
}

/*
 * Notice:
 *Before calling this function,
 *precvframe->u.hdr.rx_data should be ready!
 */
static void update_recvframe_phyinfo(union recv_frame *precvframe,
				     struct phy_stat *pphy_status)
{
	struct adapter *padapter = precvframe->u.hdr.adapter;
	struct rx_pkt_attrib *pattrib = &precvframe->u.hdr.attrib;
	struct hal_com_data *p_hal_data = GET_HAL_DATA(padapter);
	struct odm_phy_info *p_phy_info =
		(struct odm_phy_info *)(&pattrib->phy_info);

	u8 *wlanhdr = precvframe->u.hdr.rx_data;
	u8 *my_bssid;
	u8 *rx_bssid;
	u8 *rx_ra;
	u8 *my_hwaddr;
	u8 *sa = NULL;

	struct odm_packet_info pkt_info = {
		.data_rate   = 0x00,
		.station_id  = 0x00,
		.bssid_match = false,
		.to_self     = false,
		.is_beacon   = false,
	};

	/* unsigned long		irqL; */
	struct sta_priv *pstapriv;
	struct sta_info *psta;

	my_bssid = get_bssid(&padapter->mlmepriv);
	rx_bssid = get_hdr_bssid(wlanhdr);
	pkt_info.bssid_match = ((!IsFrameTypeCtrl(wlanhdr)) &&
				!pattrib->icv_err && !pattrib->crc_err &&
				ether_addr_equal(rx_bssid, my_bssid));

	rx_ra = rtl8723bs_get_ra(wlanhdr);
	my_hwaddr = myid(&padapter->eeprompriv);
	pkt_info.to_self = pkt_info.bssid_match &&
		ether_addr_equal(rx_ra, my_hwaddr);


	pkt_info.is_beacon = pkt_info.bssid_match &&
		(GetFrameSubType(wlanhdr) == WIFI_BEACON);

	sa = get_ta(wlanhdr);

	pkt_info.station_id = 0xFF;

	pstapriv = &padapter->stapriv;
	psta = rtw_get_stainfo(pstapriv, sa);
	if (psta)
		pkt_info.station_id = psta->mac_id;

	pkt_info.data_rate = pattrib->data_rate;

	/* rtl8723b_query_rx_phy_status(precvframe, pphy_status); */
	/* spin_lock_bh(&p_hal_data->odm_stainfo_lock); */
	odm_phy_status_query(&p_hal_data->odmpriv, p_phy_info,
			   (u8 *)pphy_status, &(pkt_info));
	if (psta)
		psta->rssi = pattrib->phy_info.RecvSignalPower;
	/* spin_unlock_bh(&p_hal_data->odm_stainfo_lock); */
	precvframe->u.hdr.psta = NULL;
	if (
		pkt_info.bssid_match &&
		(check_fwstate(&padapter->mlmepriv, WIFI_AP_STATE) == true)
	) {
		if (psta) {
			precvframe->u.hdr.psta = psta;
			rtl8723b_process_phy_info(padapter, precvframe);
		}
	} else if (pkt_info.to_self || pkt_info.is_beacon) {
		u32 adhoc_state = WIFI_ADHOC_STATE | WIFI_ADHOC_MASTER_STATE;
		if (check_fwstate(&padapter->mlmepriv, adhoc_state))
			if (psta)
				precvframe->u.hdr.psta = psta;
		rtl8723b_process_phy_info(padapter, precvframe);
	}
}

static void rtl8723bs_c2h_packet_handler(struct adapter *padapter,
					 u8 *pbuf, u16 length)
{
	u8 *tmp = NULL;
	u8 res = false;

	if (length == 0)
		return;

	tmp = rtw_zmalloc(length);
	if (!tmp)
		return;

	memcpy(tmp, pbuf, length);

	res = rtw_c2h_packet_wk_cmd(padapter, tmp, length);

	if (!res)
		kfree(tmp);
}

static inline union recv_frame *try_alloc_recvframe(struct recv_priv *precvpriv,
						    struct recv_buf *precvbuf)
{
	union recv_frame *precvframe;

	precvframe = rtw_alloc_recvframe(&precvpriv->free_recv_queue);
	if (!precvframe) {
		rtw_enqueue_recvbuf_to_head(precvbuf,
					    &precvpriv->recv_buf_pending_queue);

		/*  The case of can't allocate recvframe should be temporary, */
		/*  schedule again and hope recvframe is available next time. */
		tasklet_schedule(&precvpriv->recv_tasklet);
	}

	return precvframe;
}

static inline bool rx_crc_err(struct recv_priv *precvpriv,
			      struct hal_com_data *p_hal_data,
			      struct rx_pkt_attrib *pattrib,
			      union recv_frame *precvframe)
{
	/*  fix Hardware RX data error, drop whole recv_buffer */
	if ((!(p_hal_data->ReceiveConfig & RCR_ACRC32)) && pattrib->crc_err) {
		rtw_free_recvframe(precvframe, &precvpriv->free_recv_queue);
		return true;
	}

	return false;
}

static inline bool pkt_exceeds_tail(struct recv_priv *precvpriv,
				    u8 *end, u8 *tail,
				    union recv_frame *precvframe)
{
	if (end > tail) {
		rtw_free_recvframe(precvframe, &precvpriv->free_recv_queue);
		return true;
	}

	return false;
}

static void rtl8723bs_recv_tasklet(struct tasklet_struct *t)
{
	struct adapter *padapter = from_tasklet(padapter, t,
						recvpriv.recv_tasklet);
	struct hal_com_data *p_hal_data;
	struct recv_priv *precvpriv;
	struct recv_buf *precvbuf;
	union recv_frame *precvframe;
	struct rx_pkt_attrib *pattrib;
	struct __queue *recv_buf_queue;
	u8 *ptr;
	u32 pkt_offset, skb_len, alloc_sz;
	struct sk_buff *pkt_copy = NULL;
	u8 shift_sz = 0, rx_report_sz = 0;

	p_hal_data = GET_HAL_DATA(padapter);
	precvpriv = &padapter->recvpriv;
	recv_buf_queue = &precvpriv->recv_buf_pending_queue;

	do {
		precvbuf = rtw_dequeue_recvbuf(recv_buf_queue);
		if (!precvbuf)
			break;

		ptr = precvbuf->pdata;

		while (ptr < precvbuf->ptail) {
			precvframe = try_alloc_recvframe(precvpriv, precvbuf);
			if (!precvframe)
				return;

			/* rx desc parsing */
			update_recvframe_attrib(padapter, precvframe,
						(struct recv_stat *)ptr);

			pattrib = &precvframe->u.hdr.attrib;

			if (rx_crc_err(precvpriv, p_hal_data,
				       pattrib, precvframe))
				break;

			rx_report_sz = RXDESC_SIZE + pattrib->drvinfo_sz;
			pkt_offset = rx_report_sz +
				pattrib->shift_sz +
				pattrib->pkt_len;

			if (pkt_exceeds_tail(precvpriv, ptr + pkt_offset,
					     precvbuf->ptail, precvframe))
				break;

			if ((pattrib->crc_err) || (pattrib->icv_err)) {
				rtw_free_recvframe(precvframe,
						   &precvpriv->free_recv_queue);
			} else {
				/* 	Modified by Albert 20101213 */
				/* 	For 8 bytes IP header alignment. */
				if (pattrib->qos)	/* 	Qos data, wireless lan header length is 26 */
					shift_sz = 6;
				else
					shift_sz = 0;

				skb_len = pattrib->pkt_len;

				/*  for first fragment packet, driver need allocate 1536+drvinfo_sz+RXDESC_SIZE to defrag packet. */
				/*  modify alloc_sz for recvive crc error packet by thomas 2011-06-02 */
				if ((pattrib->mfrag == 1) && (pattrib->frag_num == 0)) {
					if (skb_len <= 1650)
						alloc_sz = 1664;
					else
						alloc_sz = skb_len + 14;
				} else {
					alloc_sz = skb_len;
					/* 	6 is for IP header 8 bytes alignment in QoS packet case. */
					/* 	8 is for skb->data 4 bytes alignment. */
					alloc_sz += 14;
				}

				pkt_copy = rtw_skb_alloc(alloc_sz);
				if (!pkt_copy) {
					rtw_free_recvframe(precvframe, &precvpriv->free_recv_queue);
					break;
				}

				pkt_copy->dev = padapter->pnetdev;
				precvframe->u.hdr.pkt = pkt_copy;
				skb_reserve(pkt_copy, 8 - ((SIZE_PTR)(pkt_copy->data) & 7));/* force pkt_copy->data at 8-byte alignment address */
				skb_reserve(pkt_copy, shift_sz);/* force ip_hdr at 8-byte alignment address according to shift_sz. */
				memcpy(pkt_copy->data, (ptr + rx_report_sz + pattrib->shift_sz), skb_len);
				precvframe->u.hdr.rx_head = pkt_copy->head;
				precvframe->u.hdr.rx_data = precvframe->u.hdr.rx_tail = pkt_copy->data;
				precvframe->u.hdr.rx_end = skb_end_pointer(pkt_copy);

				recvframe_put(precvframe, skb_len);
				/* recvframe_pull(precvframe, drvinfo_sz + RXDESC_SIZE); */

				if (p_hal_data->ReceiveConfig & RCR_APPFCS)
					recvframe_pull_tail(precvframe, IEEE80211_FCS_LEN);

				/*  move to drv info position */
				ptr += RXDESC_SIZE;

				/*  update drv info */
				if (p_hal_data->ReceiveConfig & RCR_APP_BA_SSN) {
					/* rtl8723s_update_bassn(padapter, pdrvinfo); */
					ptr += 4;
				}

				if (pattrib->pkt_rpt_type == NORMAL_RX) { /* Normal rx packet */
					if (pattrib->physt)
						update_recvframe_phyinfo(precvframe, (struct phy_stat *)ptr);

					rtw_recv_entry(precvframe);
				} else if (pattrib->pkt_rpt_type == C2H_PACKET) {
					struct c2h_evt_hdr_t	C2hEvent;

					u16 len_c2h = pattrib->pkt_len;
					u8 *pbuf_c2h = precvframe->u.hdr.rx_data;
					u8 *pdata_c2h;

					C2hEvent.CmdID = pbuf_c2h[0];
					C2hEvent.CmdSeq = pbuf_c2h[1];
					C2hEvent.CmdLen = (len_c2h-2);
					pdata_c2h = pbuf_c2h+2;

					if (C2hEvent.CmdID == C2H_CCX_TX_RPT)
						CCX_FwC2HTxRpt_8723b(padapter, pdata_c2h, C2hEvent.CmdLen);
					else
						rtl8723bs_c2h_packet_handler(padapter, precvframe->u.hdr.rx_data, pattrib->pkt_len);

					rtw_free_recvframe(precvframe, &precvpriv->free_recv_queue);
				}
			}

			pkt_offset = round_up(pkt_offset, 8);
			precvbuf->pdata += pkt_offset;
			ptr = precvbuf->pdata;
			precvframe = NULL;
			pkt_copy = NULL;
		}

		rtw_enqueue_recvbuf(precvbuf, &precvpriv->free_recv_buf_queue);
	} while (1);
}

/*
 * Initialize recv private variable for hardware dependent
 * 1. recv buf
 * 2. recv tasklet
 *
 */
s32 rtl8723bs_init_recv_priv(struct adapter *padapter)
{
	s32 res;
	u32 i, n;
	struct recv_priv *precvpriv;
	struct recv_buf *precvbuf;

	res = _SUCCESS;
	precvpriv = &padapter->recvpriv;

	/* 3 1. init recv buffer */
	INIT_LIST_HEAD(&precvpriv->free_recv_buf_queue.queue);
	spin_lock_init(&precvpriv->free_recv_buf_queue.lock);
	INIT_LIST_HEAD(&precvpriv->recv_buf_pending_queue.queue);
	spin_lock_init(&precvpriv->recv_buf_pending_queue.lock);

	n = NR_RECVBUFF * sizeof(struct recv_buf) + 4;
	precvpriv->pallocated_recv_buf = rtw_zmalloc(n);
	if (!precvpriv->pallocated_recv_buf) {
		res = _FAIL;
		goto exit;
	}

	precvpriv->precv_buf = (u8 *)N_BYTE_ALIGMENT((SIZE_PTR)(precvpriv->pallocated_recv_buf), 4);

	/*  init each recv buffer */
	precvbuf = (struct recv_buf *)precvpriv->precv_buf;
	for (i = 0; i < NR_RECVBUFF; i++) {
		initrecvbuf(precvbuf, padapter);

		if (!precvbuf->pskb) {
			SIZE_PTR tmpaddr = 0;
			SIZE_PTR alignment = 0;

			precvbuf->pskb = rtw_skb_alloc(MAX_RECVBUF_SZ + RECVBUFF_ALIGN_SZ);

			if (precvbuf->pskb) {
				precvbuf->pskb->dev = padapter->pnetdev;

				tmpaddr = (SIZE_PTR)precvbuf->pskb->data;
				alignment = tmpaddr & (RECVBUFF_ALIGN_SZ-1);
				skb_reserve(precvbuf->pskb, (RECVBUFF_ALIGN_SZ - alignment));
			}
		}

		list_add_tail(&precvbuf->list, &precvpriv->free_recv_buf_queue.queue);

		precvbuf++;
	}
	precvpriv->free_recv_buf_queue_cnt = i;

	if (res == _FAIL)
		goto initbuferror;

	/* 3 2. init tasklet */
	tasklet_setup(&precvpriv->recv_tasklet, rtl8723bs_recv_tasklet);

	goto exit;

initbuferror:
	precvbuf = (struct recv_buf *)precvpriv->precv_buf;
	if (precvbuf) {
		n = precvpriv->free_recv_buf_queue_cnt;
		precvpriv->free_recv_buf_queue_cnt = 0;
		for (i = 0; i < n ; i++) {
			list_del_init(&precvbuf->list);
			rtw_os_recvbuf_resource_free(padapter, precvbuf);
			precvbuf++;
		}
		precvpriv->precv_buf = NULL;
	}

	kfree(precvpriv->pallocated_recv_buf);
	precvpriv->pallocated_recv_buf = NULL;

exit:
	return res;
}

/*
 * Free recv private variable of hardware dependent
 * 1. recv buf
 * 2. recv tasklet
 *
 */
void rtl8723bs_free_recv_priv(struct adapter *padapter)
{
	u32 i;
	struct recv_priv *precvpriv;
	struct recv_buf *precvbuf;

	precvpriv = &padapter->recvpriv;

	/* 3 1. kill tasklet */
	tasklet_kill(&precvpriv->recv_tasklet);

	/* 3 2. free all recv buffers */
	precvbuf = (struct recv_buf *)precvpriv->precv_buf;
	if (precvbuf) {
		precvpriv->free_recv_buf_queue_cnt = 0;
		for (i = 0; i < NR_RECVBUFF; i++) {
			list_del_init(&precvbuf->list);
			rtw_os_recvbuf_resource_free(padapter, precvbuf);
			precvbuf++;
		}
		precvpriv->precv_buf = NULL;
	}

	kfree(precvpriv->pallocated_recv_buf);
	precvpriv->pallocated_recv_buf = NULL;
}