xmit_linux.c

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