1// SPDX-License-Identifier: GPL-2.0
2/******************************************************************************
3 *
4 * Copyright(c) 2007 - 2012 Realtek Corporation. All rights reserved.
5 *
6 ******************************************************************************/
7#include <drv_types.h>
8#include <rtw_debug.h>
9
10
11uint rtw_remainder_len(struct pkt_file *pfile)
12{
13	return (pfile->buf_len - ((SIZE_PTR)(pfile->cur_addr) - (SIZE_PTR)(pfile->buf_start)));
14}
15
16void _rtw_open_pktfile(struct sk_buff *pktptr, struct pkt_file *pfile)
17{
18	pfile->pkt = pktptr;
19	pfile->cur_addr = pfile->buf_start = pktptr->data;
20	pfile->pkt_len = pfile->buf_len = pktptr->len;
21
22	pfile->cur_buffer = pfile->buf_start;
23}
24
25uint _rtw_pktfile_read(struct pkt_file *pfile, u8 *rmem, uint rlen)
26{
27	uint	len = 0;
28
29	len =  rtw_remainder_len(pfile);
30	len = (rlen > len) ? len : rlen;
31
32	if (rmem)
33		skb_copy_bits(pfile->pkt, pfile->buf_len - pfile->pkt_len, rmem, len);
34
35	pfile->cur_addr += len;
36	pfile->pkt_len -= len;
37	return len;
38}
39
40signed int rtw_endofpktfile(struct pkt_file *pfile)
41{
42	if (pfile->pkt_len == 0)
43		return true;
44	return false;
45}
46
47int rtw_os_xmit_resource_alloc(struct adapter *padapter, struct xmit_buf *pxmitbuf, u32 alloc_sz, u8 flag)
48{
49	if (alloc_sz > 0) {
50		pxmitbuf->pallocated_buf = rtw_zmalloc(alloc_sz);
51		if (!pxmitbuf->pallocated_buf)
52			return _FAIL;
53
54		pxmitbuf->pbuf = (u8 *)N_BYTE_ALIGMENT((SIZE_PTR)(pxmitbuf->pallocated_buf), XMITBUF_ALIGN_SZ);
55	}
56
57	return _SUCCESS;
58}
59
60void rtw_os_xmit_resource_free(struct adapter *padapter, struct xmit_buf *pxmitbuf, u32 free_sz, u8 flag)
61{
62	if (free_sz > 0)
63		kfree(pxmitbuf->pallocated_buf);
64}
65
66#define WMM_XMIT_THRESHOLD	(NR_XMITFRAME * 2 / 5)
67
68void rtw_os_pkt_complete(struct adapter *padapter, struct sk_buff *pkt)
69{
70	u16 queue;
71	struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
72
73	queue = skb_get_queue_mapping(pkt);
74	if (padapter->registrypriv.wifi_spec) {
75		if (__netif_subqueue_stopped(padapter->pnetdev, queue) &&
76		    (pxmitpriv->hwxmits[queue].accnt < WMM_XMIT_THRESHOLD))
77			netif_wake_subqueue(padapter->pnetdev, queue);
78	} else {
79		if (__netif_subqueue_stopped(padapter->pnetdev, queue))
80			netif_wake_subqueue(padapter->pnetdev, queue);
81	}
82
83	dev_kfree_skb_any(pkt);
84}
85
86void rtw_os_xmit_complete(struct adapter *padapter, struct xmit_frame *pxframe)
87{
88	if (pxframe->pkt)
89		rtw_os_pkt_complete(padapter, pxframe->pkt);
90
91	pxframe->pkt = NULL;
92}
93
94void rtw_os_xmit_schedule(struct adapter *padapter)
95{
96	struct adapter *pri_adapter = padapter;
97
98	if (!padapter)
99		return;
100
101	if (!list_empty(&padapter->xmitpriv.pending_xmitbuf_queue.queue))
102		complete(&pri_adapter->xmitpriv.xmit_comp);
103}
104
105static void rtw_check_xmit_resource(struct adapter *padapter, struct sk_buff *pkt)
106{
107	struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
108	u16 queue;
109
110	queue = skb_get_queue_mapping(pkt);
111	if (padapter->registrypriv.wifi_spec) {
112		/* No free space for Tx, tx_worker is too slow */
113		if (pxmitpriv->hwxmits[queue].accnt > WMM_XMIT_THRESHOLD)
114			netif_stop_subqueue(padapter->pnetdev, queue);
115	} else {
116		if (pxmitpriv->free_xmitframe_cnt <= 4) {
117			if (!netif_tx_queue_stopped(netdev_get_tx_queue(padapter->pnetdev, queue)))
118				netif_stop_subqueue(padapter->pnetdev, queue);
119		}
120	}
121}
122
123static int rtw_mlcst2unicst(struct adapter *padapter, struct sk_buff *skb)
124{
125	struct	sta_priv *pstapriv = &padapter->stapriv;
126	struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
127	struct list_head	*phead, *plist;
128	struct sk_buff *newskb;
129	struct sta_info *psta = NULL;
130	u8 chk_alive_num = 0;
131	char chk_alive_list[NUM_STA];
132	u8 bc_addr[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
133	u8 null_addr[6] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
134
135	int i;
136	s32	res;
137
138	spin_lock_bh(&pstapriv->asoc_list_lock);
139	phead = &pstapriv->asoc_list;
140	/* free sta asoc_queue */
141	list_for_each(plist, phead) {
142		int stainfo_offset;
143
144		psta = list_entry(plist, struct sta_info, asoc_list);
145
146		stainfo_offset = rtw_stainfo_offset(pstapriv, psta);
147		if (stainfo_offset_valid(stainfo_offset)) {
148			chk_alive_list[chk_alive_num++] = stainfo_offset;
149		}
150	}
151	spin_unlock_bh(&pstapriv->asoc_list_lock);
152
153	for (i = 0; i < chk_alive_num; i++) {
154		psta = rtw_get_stainfo_by_offset(pstapriv, chk_alive_list[i]);
155		if (!(psta->state & _FW_LINKED))
156			continue;
157
158		/* avoid come from STA1 and send back STA1 */
159		if (!memcmp(psta->hwaddr, &skb->data[6], 6) ||
160		    !memcmp(psta->hwaddr, null_addr, 6) ||
161		    !memcmp(psta->hwaddr, bc_addr, 6))
162			continue;
163
164		newskb = rtw_skb_copy(skb);
165
166		if (newskb) {
167			memcpy(newskb->data, psta->hwaddr, 6);
168			res = rtw_xmit(padapter, &newskb);
169			if (res < 0) {
170				pxmitpriv->tx_drop++;
171				dev_kfree_skb_any(newskb);
172			}
173		} else {
174			pxmitpriv->tx_drop++;
175			/* dev_kfree_skb_any(skb); */
176			return false;	/*  Caller shall tx this multicast frame via normal way. */
177		}
178	}
179
180	dev_kfree_skb_any(skb);
181	return true;
182}
183
184void _rtw_xmit_entry(struct sk_buff *pkt, struct net_device *pnetdev)
185{
186	struct adapter *padapter = rtw_netdev_priv(pnetdev);
187	struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
188	struct mlme_priv *pmlmepriv = &padapter->mlmepriv;
189	s32 res = 0;
190
191	if (rtw_if_up(padapter) == false)
192		goto drop_packet;
193
194	rtw_check_xmit_resource(padapter, pkt);
195
196	if (!rtw_mc2u_disable
197		&& check_fwstate(pmlmepriv, WIFI_AP_STATE) == true
198		&& (IP_MCAST_MAC(pkt->data)
199			|| ICMPV6_MCAST_MAC(pkt->data)
200			)
201		&& padapter->registrypriv.wifi_spec == 0) {
202		if (pxmitpriv->free_xmitframe_cnt > (NR_XMITFRAME / 4)) {
203			res = rtw_mlcst2unicst(padapter, pkt);
204			if (res)
205				return;
206		}
207	}
208
209	res = rtw_xmit(padapter, &pkt);
210	if (res < 0)
211		goto drop_packet;
212
213	return;
214
215drop_packet:
216	pxmitpriv->tx_drop++;
217	dev_kfree_skb_any(pkt);
218}
219
220netdev_tx_t rtw_xmit_entry(struct sk_buff *pkt, struct net_device *pnetdev)
221{
222	if (pkt)
223		_rtw_xmit_entry(pkt, pnetdev);
224
225	return NETDEV_TX_OK;
226}
227