staging: Add rtl8723bs sdio wifi driver

The rtl8723bs is found on quite a few systems used by Linux users,
such as on Atom systems (Intel Computestick and various other
Atom based devices) and on many (budget) ARM boards such as
the CHIP.

The plan moving forward with this is for the new clean,
written from scratch, rtl8xxxu driver to eventually gain
support for sdio devices. But there is no clear timeline
for that, so lets add this driver included in staging for now.

Cc: Bastien Nocera <hadess@hadess.net>
Cc: Larry Finger <Larry.Finger@lwfinger.net>
Cc: Jes Sorensen <jes.sorensen@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 298 insertions, 0 deletions

diff --git a/drivers/staging/rtl8723bs/os_dep/xmit_linux.c b/drivers/staging/rtl8723bs/os_dep/xmit_linux.c
new file mode 100644
index 000000000000..5ede3b6fbdec
--- /dev/null
+++ b/drivers/staging/rtl8723bs/os_dep/xmit_linux.c
@@ -0,0 +1,298 @@
+/******************************************************************************
+ *
+ * Copyright(c) 2007 - 2012 Realtek Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ ******************************************************************************/
+#define _XMIT_OSDEP_C_
+
+#include <drv_types.h>
+#include <rtw_debug.h>
+
+
+uint rtw_remainder_len(struct pkt_file *pfile)
+{
+	return (pfile->buf_len - ((SIZE_PTR)(pfile->cur_addr) - (SIZE_PTR)(pfile->buf_start)));
+}
+
+void _rtw_open_pktfile (_pkt *pktptr, struct pkt_file *pfile)
+{
+	pfile->pkt = pktptr;
+	pfile->cur_addr = pfile->buf_start = pktptr->data;
+	pfile->pkt_len = pfile->buf_len = pktptr->len;
+
+	pfile->cur_buffer = pfile->buf_start ;
+}
+
+uint _rtw_pktfile_read (struct pkt_file *pfile, u8 *rmem, uint rlen)
+{
+	uint	len = 0;
+
+	len =  rtw_remainder_len(pfile);
+	len = (rlen > len)? len: rlen;
+
+       if (rmem)
+		skb_copy_bits(pfile->pkt, pfile->buf_len-pfile->pkt_len, rmem, len);
+
+	pfile->cur_addr += len;
+	pfile->pkt_len -= len;
+	return len;
+}
+
+sint rtw_endofpktfile(struct pkt_file *pfile)
+{
+	if (pfile->pkt_len == 0)
+		return true;
+	return false;
+}
+
+void rtw_set_tx_chksum_offload(_pkt *pkt, struct pkt_attrib *pattrib)
+{
+
+}
+
+int rtw_os_xmit_resource_alloc(struct adapter *padapter, struct xmit_buf *pxmitbuf, u32 alloc_sz, u8 flag)
+{
+	if (alloc_sz > 0) {
+		pxmitbuf->pallocated_buf = rtw_zmalloc(alloc_sz);
+		if (pxmitbuf->pallocated_buf == NULL)
+		{
+			return _FAIL;
+		}
+
+		pxmitbuf->pbuf = (u8 *)N_BYTE_ALIGMENT((SIZE_PTR)(pxmitbuf->pallocated_buf), XMITBUF_ALIGN_SZ);
+	}
+
+	return _SUCCESS;
+}
+
+void rtw_os_xmit_resource_free(struct adapter *padapter, struct xmit_buf *pxmitbuf, u32 free_sz, u8 flag)
+{
+	if (free_sz > 0) {
+		if (pxmitbuf->pallocated_buf)
+			kfree(pxmitbuf->pallocated_buf);
+	}
+}
+
+#define WMM_XMIT_THRESHOLD	(NR_XMITFRAME*2/5)
+
+void rtw_os_pkt_complete(struct adapter *padapter, _pkt *pkt)
+{
+	u16 queue;
+	struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
+
+	queue = skb_get_queue_mapping(pkt);
+	if (padapter->registrypriv.wifi_spec) {
+		if (__netif_subqueue_stopped(padapter->pnetdev, queue) &&
+			(pxmitpriv->hwxmits[queue].accnt < WMM_XMIT_THRESHOLD))
+		{
+			netif_wake_subqueue(padapter->pnetdev, queue);
+		}
+	} else {
+		if (__netif_subqueue_stopped(padapter->pnetdev, queue))
+			netif_wake_subqueue(padapter->pnetdev, queue);
+	}
+
+	dev_kfree_skb_any(pkt);
+}
+
+void rtw_os_xmit_complete(struct adapter *padapter, struct xmit_frame *pxframe)
+{
+	if (pxframe->pkt)
+		rtw_os_pkt_complete(padapter, pxframe->pkt);
+
+	pxframe->pkt = NULL;
+}
+
+void rtw_os_xmit_schedule(struct adapter *padapter)
+{
+	struct adapter *pri_adapter = padapter;
+
+	if (!padapter)
+		return;
+
+	if (!list_empty(&padapter->xmitpriv.pending_xmitbuf_queue.queue))
+		up(&pri_adapter->xmitpriv.xmit_sema);
+}
+
+static void rtw_check_xmit_resource(struct adapter *padapter, _pkt *pkt)
+{
+	struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
+	u16 queue;
+
+	queue = skb_get_queue_mapping(pkt);
+	if (padapter->registrypriv.wifi_spec) {
+		/* No free space for Tx, tx_worker is too slow */
+		if (pxmitpriv->hwxmits[queue].accnt > WMM_XMIT_THRESHOLD) {
+			/* DBG_871X("%s(): stop netif_subqueue[%d]\n", __func__, queue); */
+			netif_stop_subqueue(padapter->pnetdev, queue);
+		}
+	} else {
+		if (pxmitpriv->free_xmitframe_cnt<=4) {
+			if (!netif_tx_queue_stopped(netdev_get_tx_queue(padapter->pnetdev, queue)))
+				netif_stop_subqueue(padapter->pnetdev, queue);
+		}
+	}
+}
+
+static int rtw_mlcst2unicst(struct adapter *padapter, struct sk_buff *skb)
+{
+	struct	sta_priv *pstapriv = &padapter->stapriv;
+	struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
+	struct list_head	*phead, *plist;
+	struct sk_buff *newskb;
+	struct sta_info *psta = NULL;
+	u8 chk_alive_num = 0;
+	char chk_alive_list[NUM_STA];
+	u8 bc_addr[6]={0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
+	u8 null_addr[6]={0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
+
+	int i;
+	s32	res;
+
+	DBG_COUNTER(padapter->tx_logs.os_tx_m2u);
+
+	spin_lock_bh(&pstapriv->asoc_list_lock);
+	phead = &pstapriv->asoc_list;
+	plist = get_next(phead);
+
+	/* free sta asoc_queue */
+	while (phead != plist) {
+		int stainfo_offset;
+		psta = LIST_CONTAINOR(plist, struct sta_info, asoc_list);
+		plist = get_next(plist);
+
+		stainfo_offset = rtw_stainfo_offset(pstapriv, psta);
+		if (stainfo_offset_valid(stainfo_offset)) {
+			chk_alive_list[chk_alive_num++] = stainfo_offset;
+		}
+	}
+	spin_unlock_bh(&pstapriv->asoc_list_lock);
+
+	for (i = 0; i < chk_alive_num; i++) {
+		psta = rtw_get_stainfo_by_offset(pstapriv, chk_alive_list[i]);
+		if (!(psta->state &_FW_LINKED))
+		{
+			DBG_COUNTER(padapter->tx_logs.os_tx_m2u_ignore_fw_linked);
+			continue;
+		}
+
+		/* avoid come from STA1 and send back STA1 */
+		if (!memcmp(psta->hwaddr, &skb->data[6], 6)
+			|| !memcmp(psta->hwaddr, null_addr, 6)
+			|| !memcmp(psta->hwaddr, bc_addr, 6)
+		)
+		{
+			DBG_COUNTER(padapter->tx_logs.os_tx_m2u_ignore_self);
+			continue;
+		}
+
+		DBG_COUNTER(padapter->tx_logs.os_tx_m2u_entry);
+
+		newskb = rtw_skb_copy(skb);
+
+		if (newskb) {
+			memcpy(newskb->data, psta->hwaddr, 6);
+			res = rtw_xmit(padapter, &newskb);
+			if (res < 0) {
+				DBG_COUNTER(padapter->tx_logs.os_tx_m2u_entry_err_xmit);
+				DBG_871X("%s()-%d: rtw_xmit() return error!\n", __func__, __LINE__);
+				pxmitpriv->tx_drop++;
+				dev_kfree_skb_any(newskb);
+			}
+		} else {
+			DBG_COUNTER(padapter->tx_logs.os_tx_m2u_entry_err_skb);
+			DBG_871X("%s-%d: rtw_skb_copy() failed!\n", __func__, __LINE__);
+			pxmitpriv->tx_drop++;
+			/* dev_kfree_skb_any(skb); */
+			return false;	/*  Caller shall tx this multicast frame via normal way. */
+		}
+	}
+
+	dev_kfree_skb_any(skb);
+	return true;
+}
+
+int _rtw_xmit_entry(_pkt *pkt, _nic_hdl pnetdev)
+{
+	struct adapter *padapter = (struct adapter *)rtw_netdev_priv(pnetdev);
+	struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
+	struct mlme_priv *pmlmepriv = &padapter->mlmepriv;
+	s32 res = 0;
+
+	DBG_COUNTER(padapter->tx_logs.os_tx);
+	RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("+xmit_enry\n"));
+
+	if (rtw_if_up(padapter) == false) {
+		DBG_COUNTER(padapter->tx_logs.os_tx_err_up);
+		RT_TRACE(_module_xmit_osdep_c_, _drv_err_, ("rtw_xmit_entry: rtw_if_up fail\n"));
+		#ifdef DBG_TX_DROP_FRAME
+		DBG_871X("DBG_TX_DROP_FRAME %s if_up fail\n", __func__);
+		#endif
+		goto drop_packet;
+	}
+
+	rtw_check_xmit_resource(padapter, pkt);
+
+	if (!rtw_mc2u_disable
+		&& check_fwstate(pmlmepriv, WIFI_AP_STATE) == true
+		&& (IP_MCAST_MAC(pkt->data)
+			|| ICMPV6_MCAST_MAC(pkt->data)
+			#ifdef CONFIG_TX_BCAST2UNI
+			|| is_broadcast_mac_addr(pkt->data)
+			#endif
+			)
+		&& (padapter->registrypriv.wifi_spec == 0)
+		)
+	{
+		if (pxmitpriv->free_xmitframe_cnt > (NR_XMITFRAME/4)) {
+			res = rtw_mlcst2unicst(padapter, pkt);
+			if (res == true) {
+				goto exit;
+			}
+		} else {
+			/* DBG_871X("Stop M2U(%d, %d)! ", pxmitpriv->free_xmitframe_cnt, pxmitpriv->free_xmitbuf_cnt); */
+			/* DBG_871X("!m2u); */
+			DBG_COUNTER(padapter->tx_logs.os_tx_m2u_stop);
+		}
+	}
+
+	res = rtw_xmit(padapter, &pkt);
+	if (res < 0) {
+		#ifdef DBG_TX_DROP_FRAME
+		DBG_871X("DBG_TX_DROP_FRAME %s rtw_xmit fail\n", __func__);
+		#endif
+		goto drop_packet;
+	}
+
+	RT_TRACE(_module_xmit_osdep_c_, _drv_info_, ("rtw_xmit_entry: tx_pkts =%d\n", (u32)pxmitpriv->tx_pkts));
+	goto exit;
+
+drop_packet:
+	pxmitpriv->tx_drop++;
+	dev_kfree_skb_any(pkt);
+	RT_TRACE(_module_xmit_osdep_c_, _drv_notice_, ("rtw_xmit_entry: drop, tx_drop =%d\n", (u32)pxmitpriv->tx_drop));
+
+exit:
+	return 0;
+}
+
+int rtw_xmit_entry(_pkt *pkt, _nic_hdl pnetdev)
+{
+	int ret = 0;
+
+	if (pkt) {
+		rtw_mstat_update(MSTAT_TYPE_SKB, MSTAT_ALLOC_SUCCESS, pkt->truesize);
+		ret = _rtw_xmit_entry(pkt, pnetdev);
+	}
+
+	return ret;
+}