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gdm_qos.c
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1 /*
2  * Copyright (c) 2012 GCT Semiconductor, Inc. All rights reserved.
3  *
4  * This software is licensed under the terms of the GNU General Public
5  * License version 2, as published by the Free Software Foundation, and
6  * may be copied, distributed, and modified under those terms.
7  *
8  * This program is distributed in the hope that it will be useful,
9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11  * GNU General Public License for more details.
12  */
13 
14 #include <linux/etherdevice.h>
15 #include <asm/byteorder.h>
16 
17 #include <linux/ip.h>
18 #include <linux/tcp.h>
19 #include <linux/if_ether.h>
20 
21 #include "gdm_wimax.h"
22 #include "hci.h"
23 #include "gdm_qos.h"
24 
25 #define B2H(x) __be16_to_cpu(x)
26 
27 #undef dprintk
28 #define dprintk(fmt, args ...) printk(KERN_DEBUG "[QoS] " fmt, ## args)
29 #undef wprintk
30 #define wprintk(fmt, args ...) \
31  printk(KERN_WARNING "[QoS WARNING] " fmt, ## args)
32 #undef eprintk
33 #define eprintk(fmt, args ...) printk(KERN_ERR "[QoS ERROR] " fmt, ## args)
34 
35 
36 #define MAX_FREE_LIST_CNT 32
37 static struct {
38  struct list_head head;
39  int cnt;
40  spinlock_t lock;
41 } qos_free_list;
42 
43 static void init_qos_entry_list(void)
44 {
45  qos_free_list.cnt = 0;
46  INIT_LIST_HEAD(&qos_free_list.head);
47  spin_lock_init(&qos_free_list.lock);
48 }
49 
50 static void *alloc_qos_entry(void)
51 {
52  struct qos_entry_s *entry;
53  unsigned long flags;
54 
55  spin_lock_irqsave(&qos_free_list.lock, flags);
56  if (qos_free_list.cnt) {
57  entry = list_entry(qos_free_list.head.prev, struct qos_entry_s,
58  list);
59  list_del(&entry->list);
60  qos_free_list.cnt--;
61  spin_unlock_irqrestore(&qos_free_list.lock, flags);
62  return entry;
63  }
64  spin_unlock_irqrestore(&qos_free_list.lock, flags);
65 
66  entry = kmalloc(sizeof(struct qos_entry_s), GFP_ATOMIC);
67  return entry;
68 }
69 
70 static void free_qos_entry(void *entry)
71 {
72  struct qos_entry_s *qentry = (struct qos_entry_s *) entry;
73  unsigned long flags;
74 
75  spin_lock_irqsave(&qos_free_list.lock, flags);
76  if (qos_free_list.cnt < MAX_FREE_LIST_CNT) {
77  list_add(&qentry->list, &qos_free_list.head);
78  qos_free_list.cnt++;
79  spin_unlock_irqrestore(&qos_free_list.lock, flags);
80  return;
81  }
82  spin_unlock_irqrestore(&qos_free_list.lock, flags);
83 
84  kfree(entry);
85 }
86 
87 static void free_qos_entry_list(struct list_head *free_list)
88 {
89  struct qos_entry_s *entry, *n;
90  int total_free = 0;
91 
92  list_for_each_entry_safe(entry, n, free_list, list) {
93  list_del(&entry->list);
94  kfree(entry);
95  total_free++;
96  }
97 
98  dprintk("%s: total_free_cnt=%d\n", __func__, total_free);
99 }
100 
101 void gdm_qos_init(void *nic_ptr)
102 {
103  struct nic *nic = nic_ptr;
104  struct qos_cb_s *qcb = &nic->qos;
105  int i;
106 
107  for (i = 0 ; i < QOS_MAX; i++) {
108  INIT_LIST_HEAD(&qcb->qos_list[i]);
109  qcb->csr[i].qos_buf_count = 0;
110  qcb->csr[i].enabled = 0;
111  }
112 
113  qcb->qos_list_cnt = 0;
114  qcb->qos_null_idx = QOS_MAX-1;
115  qcb->qos_limit_size = 255;
116 
117  spin_lock_init(&qcb->qos_lock);
118 
119  init_qos_entry_list();
120 }
121 
122 void gdm_qos_release_list(void *nic_ptr)
123 {
124  struct nic *nic = nic_ptr;
125  struct qos_cb_s *qcb = &nic->qos;
126  unsigned long flags;
127  struct qos_entry_s *entry, *n;
128  struct list_head free_list;
129  int i;
130 
131  INIT_LIST_HEAD(&free_list);
132 
133  spin_lock_irqsave(&qcb->qos_lock, flags);
134 
135  for (i = 0; i < QOS_MAX; i++) {
136  qcb->csr[i].qos_buf_count = 0;
137  qcb->csr[i].enabled = 0;
138  }
139 
140  qcb->qos_list_cnt = 0;
141  qcb->qos_null_idx = QOS_MAX-1;
142 
143  for (i = 0; i < QOS_MAX; i++) {
144  list_for_each_entry_safe(entry, n, &qcb->qos_list[i], list) {
145  list_move_tail(&entry->list, &free_list);
146  }
147  }
148  spin_unlock_irqrestore(&qcb->qos_lock, flags);
149  free_qos_entry_list(&free_list);
150 }
151 
152 static u32 chk_ipv4_rule(struct gdm_wimax_csr_s *csr, u8 *Stream, u8 *port)
153 {
154  int i;
155 
156  if (csr->classifier_rule_en&IPTYPEOFSERVICE) {
157  if (((Stream[1] & csr->ip2s_mask) < csr->ip2s_lo) ||
158  ((Stream[1] & csr->ip2s_mask) > csr->ip2s_hi))
159  return 1;
160  }
161 
162  if (csr->classifier_rule_en&PROTOCOL) {
163  if (Stream[9] != csr->protocol)
164  return 1;
165  }
166 
167  if (csr->classifier_rule_en&IPMASKEDSRCADDRESS) {
168  for (i = 0; i < 4; i++) {
169  if ((Stream[12 + i] & csr->ipsrc_addrmask[i]) !=
170  (csr->ipsrc_addr[i] & csr->ipsrc_addrmask[i]))
171  return 1;
172  }
173  }
174 
175  if (csr->classifier_rule_en&IPMASKEDDSTADDRESS) {
176  for (i = 0; i < 4; i++) {
177  if ((Stream[16 + i] & csr->ipdst_addrmask[i]) !=
178  (csr->ipdst_addr[i] & csr->ipdst_addrmask[i]))
179  return 1;
180  }
181  }
182 
183  if (csr->classifier_rule_en&PROTOCOLSRCPORTRANGE) {
184  i = ((port[0]<<8)&0xff00)+port[1];
185  if ((i < csr->srcport_lo) || (i > csr->srcport_hi))
186  return 1;
187  }
188 
189  if (csr->classifier_rule_en&PROTOCOLDSTPORTRANGE) {
190  i = ((port[2]<<8)&0xff00)+port[3];
191  if ((i < csr->dstport_lo) || (i > csr->dstport_hi))
192  return 1;
193  }
194 
195  return 0;
196 }
197 
198 static u32 get_qos_index(struct nic *nic, u8 *iph, u8 *tcpudph)
199 {
200  u32 IP_Ver, Header_Len, i;
201  struct qos_cb_s *qcb = &nic->qos;
202 
203  if (iph == NULL || tcpudph == NULL)
204  return -1;
205 
206  IP_Ver = (iph[0]>>4)&0xf;
207  Header_Len = iph[0]&0xf;
208 
209  if (IP_Ver == 4) {
210  for (i = 0; i < QOS_MAX; i++) {
211  if (qcb->csr[i].enabled) {
212  if (qcb->csr[i].classifier_rule_en) {
213  if (chk_ipv4_rule(&qcb->csr[i], iph,
214  tcpudph) == 0)
215  return i;
216  }
217  }
218  }
219  }
220 
221  return -1;
222 }
223 
224 static u32 extract_qos_list(struct nic *nic, struct list_head *head)
225 {
226  struct qos_cb_s *qcb = &nic->qos;
227  struct qos_entry_s *entry;
228  int i;
229 
230  INIT_LIST_HEAD(head);
231 
232  for (i = 0; i < QOS_MAX; i++) {
233  if (qcb->csr[i].enabled) {
234  if (qcb->csr[i].qos_buf_count < qcb->qos_limit_size) {
235  if (!list_empty(&qcb->qos_list[i])) {
236  entry = list_entry(
237  qcb->qos_list[i].prev,
238  struct qos_entry_s, list);
239  list_move_tail(&entry->list, head);
240  qcb->csr[i].qos_buf_count++;
241 
242  if (!list_empty(&qcb->qos_list[i]))
243  wprintk("QoS Index(%d) is piled!!\n", i);
244  }
245  }
246  }
247  }
248 
249  return 0;
250 }
251 
252 static void send_qos_list(struct nic *nic, struct list_head *head)
253 {
254  struct qos_entry_s *entry, *n;
255 
256  list_for_each_entry_safe(entry, n, head, list) {
257  list_del(&entry->list);
258  free_qos_entry(entry);
259  gdm_wimax_send_tx(entry->skb, entry->dev);
260  }
261 }
262 
263 int gdm_qos_send_hci_pkt(struct sk_buff *skb, struct net_device *dev)
264 {
265  struct nic *nic = netdev_priv(dev);
266  int index;
267  struct qos_cb_s *qcb = &nic->qos;
268  unsigned long flags;
269  struct ethhdr *ethh = (struct ethhdr *) (skb->data + HCI_HEADER_SIZE);
270  struct iphdr *iph = (struct iphdr *) ((char *) ethh + ETH_HLEN);
271  struct tcphdr *tcph;
272  struct qos_entry_s *entry = NULL;
273  struct list_head send_list;
274  int ret = 0;
275 
276  tcph = (struct tcphdr *) iph + iph->ihl*4;
277 
278  if (B2H(ethh->h_proto) == ETH_P_IP) {
279  if (qcb->qos_list_cnt && !qos_free_list.cnt) {
280  entry = alloc_qos_entry();
281  entry->skb = skb;
282  entry->dev = dev;
283  dprintk("qcb->qos_list_cnt=%d\n", qcb->qos_list_cnt);
284  }
285 
286  spin_lock_irqsave(&qcb->qos_lock, flags);
287  if (qcb->qos_list_cnt) {
288  index = get_qos_index(nic, (u8 *)iph, (u8 *) tcph);
289  if (index == -1)
290  index = qcb->qos_null_idx;
291 
292  if (!entry) {
293  entry = alloc_qos_entry();
294  entry->skb = skb;
295  entry->dev = dev;
296  }
297 
298  list_add_tail(&entry->list, &qcb->qos_list[index]);
299  extract_qos_list(nic, &send_list);
300  spin_unlock_irqrestore(&qcb->qos_lock, flags);
301  send_qos_list(nic, &send_list);
302  goto out;
303  }
304  spin_unlock_irqrestore(&qcb->qos_lock, flags);
305  if (entry)
306  free_qos_entry(entry);
307  }
308 
309  ret = gdm_wimax_send_tx(skb, dev);
310 out:
311  return ret;
312 }
313 
314 static u32 get_csr(struct qos_cb_s *qcb, u32 SFID, int mode)
315 {
316  int i;
317 
318  for (i = 0; i < qcb->qos_list_cnt; i++) {
319  if (qcb->csr[i].SFID == SFID)
320  return i;
321  }
322 
323  if (mode) {
324  for (i = 0; i < QOS_MAX; i++) {
325  if (qcb->csr[i].enabled == 0) {
326  qcb->csr[i].enabled = 1;
327  qcb->qos_list_cnt++;
328  return i;
329  }
330  }
331  }
332  return -1;
333 }
334 
335 #define QOS_CHANGE_DEL 0xFC
336 #define QOS_ADD 0xFD
337 #define QOS_REPORT 0xFE
338 
339 void gdm_recv_qos_hci_packet(void *nic_ptr, u8 *buf, int size)
340 {
341  struct nic *nic = nic_ptr;
342  u32 i, SFID, index, pos;
343  u8 subCmdEvt;
344  u8 len;
345  struct qos_cb_s *qcb = &nic->qos;
346  struct qos_entry_s *entry, *n;
347  struct list_head send_list;
348  struct list_head free_list;
349  unsigned long flags;
350 
351  subCmdEvt = (u8)buf[4];
352 
353  if (subCmdEvt == QOS_REPORT) {
354  len = (u8)buf[5];
355 
356  spin_lock_irqsave(&qcb->qos_lock, flags);
357  for (i = 0; i < qcb->qos_list_cnt; i++) {
358  SFID = ((buf[(i*5)+6]<<24)&0xff000000);
359  SFID += ((buf[(i*5)+7]<<16)&0xff0000);
360  SFID += ((buf[(i*5)+8]<<8)&0xff00);
361  SFID += (buf[(i*5)+9]);
362  index = get_csr(qcb, SFID, 0);
363  if (index == -1) {
364  spin_unlock_irqrestore(&qcb->qos_lock, flags);
365  eprintk("QoS ERROR: No SF\n");
366  return;
367  }
368  qcb->csr[index].qos_buf_count = buf[(i*5)+10];
369  }
370 
371  extract_qos_list(nic, &send_list);
372  spin_unlock_irqrestore(&qcb->qos_lock, flags);
373  send_qos_list(nic, &send_list);
374  return;
375  } else if (subCmdEvt == QOS_ADD) {
376  pos = 5;
377  len = (u8)buf[pos++];
378 
379  SFID = ((buf[pos++]<<24)&0xff000000);
380  SFID += ((buf[pos++]<<16)&0xff0000);
381  SFID += ((buf[pos++]<<8)&0xff00);
382  SFID += (buf[pos++]);
383 
384  index = get_csr(qcb, SFID, 1);
385  if (index == -1) {
386  eprintk("QoS ERROR: csr Update Error\n");
387  return;
388  }
389 
390  dprintk("QOS_ADD SFID = 0x%x, index=%d\n", SFID, index);
391 
392  spin_lock_irqsave(&qcb->qos_lock, flags);
393  qcb->csr[index].SFID = SFID;
394  qcb->csr[index].classifier_rule_en = ((buf[pos++]<<8)&0xff00);
395  qcb->csr[index].classifier_rule_en += buf[pos++];
396  if (qcb->csr[index].classifier_rule_en == 0)
397  qcb->qos_null_idx = index;
398  qcb->csr[index].ip2s_mask = buf[pos++];
399  qcb->csr[index].ip2s_lo = buf[pos++];
400  qcb->csr[index].ip2s_hi = buf[pos++];
401  qcb->csr[index].protocol = buf[pos++];
402  qcb->csr[index].ipsrc_addrmask[0] = buf[pos++];
403  qcb->csr[index].ipsrc_addrmask[1] = buf[pos++];
404  qcb->csr[index].ipsrc_addrmask[2] = buf[pos++];
405  qcb->csr[index].ipsrc_addrmask[3] = buf[pos++];
406  qcb->csr[index].ipsrc_addr[0] = buf[pos++];
407  qcb->csr[index].ipsrc_addr[1] = buf[pos++];
408  qcb->csr[index].ipsrc_addr[2] = buf[pos++];
409  qcb->csr[index].ipsrc_addr[3] = buf[pos++];
410  qcb->csr[index].ipdst_addrmask[0] = buf[pos++];
411  qcb->csr[index].ipdst_addrmask[1] = buf[pos++];
412  qcb->csr[index].ipdst_addrmask[2] = buf[pos++];
413  qcb->csr[index].ipdst_addrmask[3] = buf[pos++];
414  qcb->csr[index].ipdst_addr[0] = buf[pos++];
415  qcb->csr[index].ipdst_addr[1] = buf[pos++];
416  qcb->csr[index].ipdst_addr[2] = buf[pos++];
417  qcb->csr[index].ipdst_addr[3] = buf[pos++];
418  qcb->csr[index].srcport_lo = ((buf[pos++]<<8)&0xff00);
419  qcb->csr[index].srcport_lo += buf[pos++];
420  qcb->csr[index].srcport_hi = ((buf[pos++]<<8)&0xff00);
421  qcb->csr[index].srcport_hi += buf[pos++];
422  qcb->csr[index].dstport_lo = ((buf[pos++]<<8)&0xff00);
423  qcb->csr[index].dstport_lo += buf[pos++];
424  qcb->csr[index].dstport_hi = ((buf[pos++]<<8)&0xff00);
425  qcb->csr[index].dstport_hi += buf[pos++];
426 
427  qcb->qos_limit_size = 254/qcb->qos_list_cnt;
428  spin_unlock_irqrestore(&qcb->qos_lock, flags);
429  } else if (subCmdEvt == QOS_CHANGE_DEL) {
430  pos = 5;
431  len = (u8)buf[pos++];
432  SFID = ((buf[pos++]<<24)&0xff000000);
433  SFID += ((buf[pos++]<<16)&0xff0000);
434  SFID += ((buf[pos++]<<8)&0xff00);
435  SFID += (buf[pos++]);
436  index = get_csr(qcb, SFID, 1);
437  if (index == -1) {
438  eprintk("QoS ERROR: Wrong index(%d)\n", index);
439  return;
440  }
441 
442  dprintk("QOS_CHANGE_DEL SFID = 0x%x, index=%d\n", SFID, index);
443 
444  INIT_LIST_HEAD(&free_list);
445 
446  spin_lock_irqsave(&qcb->qos_lock, flags);
447  qcb->csr[index].enabled = 0;
448  qcb->qos_list_cnt--;
449  qcb->qos_limit_size = 254/qcb->qos_list_cnt;
450 
451  list_for_each_entry_safe(entry, n, &qcb->qos_list[index],
452  list) {
453  list_move_tail(&entry->list, &free_list);
454  }
455  spin_unlock_irqrestore(&qcb->qos_lock, flags);
456  free_qos_entry_list(&free_list);
457  }
458 }
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