kernel/drivers/staging/gdm72xx/gdm_qos.c

   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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  15
  16 #include <linux/etherdevice.h>
  17 #include <asm/byteorder.h>
  18
  19 #include <linux/ip.h>
  20 #include <linux/tcp.h>
  21 #include <linux/if_ether.h>
  22
  23 #include "gdm_wimax.h"
  24 #include "hci.h"
  25 #include "gdm_qos.h"
  26
  27 #define MAX_FREE_LIST_CNT               32
  28 static struct {
  29         struct list_head head;
  30         int cnt;
  31         spinlock_t lock;
  32 } qos_free_list;
  33
  34 static void init_qos_entry_list(void)
  35 {
  36         qos_free_list.cnt = 0;
  37         INIT_LIST_HEAD(&qos_free_list.head);
  38         spin_lock_init(&qos_free_list.lock);
  39 }
  40
  41 static void *alloc_qos_entry(void)
  42 {
  43         struct qos_entry_s *entry;
  44         unsigned long flags;
  45
  46         spin_lock_irqsave(&qos_free_list.lock, flags);
  47         if (qos_free_list.cnt) {
  48                 entry = list_entry(qos_free_list.head.prev, struct qos_entry_s,
  49                                    list);
  50                 list_del(&entry->list);
  51                 qos_free_list.cnt--;
  52                 spin_unlock_irqrestore(&qos_free_list.lock, flags);
  53                 return entry;
  54         }
  55         spin_unlock_irqrestore(&qos_free_list.lock, flags);
  56
  57         return kmalloc(sizeof(*entry), GFP_ATOMIC);
  58 }
  59
  60 static void free_qos_entry(void *entry)
  61 {
  62         struct qos_entry_s *qentry = (struct qos_entry_s *)entry;
  63         unsigned long flags;
  64
  65         spin_lock_irqsave(&qos_free_list.lock, flags);
  66         if (qos_free_list.cnt < MAX_FREE_LIST_CNT) {
  67                 list_add(&qentry->list, &qos_free_list.head);
  68                 qos_free_list.cnt++;
  69                 spin_unlock_irqrestore(&qos_free_list.lock, flags);
  70                 return;
  71         }
  72         spin_unlock_irqrestore(&qos_free_list.lock, flags);
  73
  74         kfree(entry);
  75 }
  76
  77 static void free_qos_entry_list(struct list_head *free_list)
  78 {
  79         struct qos_entry_s *entry, *n;
  80         int total_free = 0;
  81
  82         list_for_each_entry_safe(entry, n, free_list, list) {
  83                 list_del(&entry->list);
  84                 kfree(entry);
  85                 total_free++;
  86         }
  87
  88         pr_debug("%s: total_free_cnt=%d\n", __func__, total_free);
  89 }
  90
  91 void gdm_qos_init(void *nic_ptr)
  92 {
  93         struct nic *nic = nic_ptr;
  94         struct qos_cb_s *qcb = &nic->qos;
  95         int i;
  96
  97         for (i = 0; i < QOS_MAX; i++) {
  98                 INIT_LIST_HEAD(&qcb->qos_list[i]);
  99                 qcb->csr[i].qos_buf_count = 0;
 100                 qcb->csr[i].enabled = false;
 101         }
 102
 103         qcb->qos_list_cnt = 0;
 104         qcb->qos_null_idx = QOS_MAX-1;
 105         qcb->qos_limit_size = 255;
 106
 107         spin_lock_init(&qcb->qos_lock);
 108
 109         init_qos_entry_list();
 110 }
 111
 112 void gdm_qos_release_list(void *nic_ptr)
 113 {
 114         struct nic *nic = nic_ptr;
 115         struct qos_cb_s *qcb = &nic->qos;
 116         unsigned long flags;
 117         struct qos_entry_s *entry, *n;
 118         struct list_head free_list;
 119         int i;
 120
 121         INIT_LIST_HEAD(&free_list);
 122
 123         spin_lock_irqsave(&qcb->qos_lock, flags);
 124
 125         for (i = 0; i < QOS_MAX; i++) {
 126                 qcb->csr[i].qos_buf_count = 0;
 127                 qcb->csr[i].enabled = false;
 128         }
 129
 130         qcb->qos_list_cnt = 0;
 131         qcb->qos_null_idx = QOS_MAX-1;
 132
 133         for (i = 0; i < QOS_MAX; i++) {
 134                 list_for_each_entry_safe(entry, n, &qcb->qos_list[i], list) {
 135                         list_move_tail(&entry->list, &free_list);
 136                 }
 137         }
 138         spin_unlock_irqrestore(&qcb->qos_lock, flags);
 139         free_qos_entry_list(&free_list);
 140 }
 141
 142 static int chk_ipv4_rule(struct gdm_wimax_csr_s *csr, u8 *stream, u8 *port)
 143 {
 144         int i;
 145
 146         if (csr->classifier_rule_en&IPTYPEOFSERVICE) {
 147                 if (((stream[1] & csr->ip2s_mask) < csr->ip2s_lo) ||
 148                     ((stream[1] & csr->ip2s_mask) > csr->ip2s_hi))
 149                         return 1;
 150         }
 151
 152         if (csr->classifier_rule_en&PROTOCOL) {
 153                 if (stream[9] != csr->protocol)
 154                         return 1;
 155         }
 156
 157         if (csr->classifier_rule_en&IPMASKEDSRCADDRESS) {
 158                 for (i = 0; i < 4; i++) {
 159                         if ((stream[12 + i] & csr->ipsrc_addrmask[i]) !=
 160                         (csr->ipsrc_addr[i] & csr->ipsrc_addrmask[i]))
 161                                 return 1;
 162                 }
 163         }
 164
 165         if (csr->classifier_rule_en&IPMASKEDDSTADDRESS) {
 166                 for (i = 0; i < 4; i++) {
 167                         if ((stream[16 + i] & csr->ipdst_addrmask[i]) !=
 168                         (csr->ipdst_addr[i] & csr->ipdst_addrmask[i]))
 169                                 return 1;
 170                 }
 171         }
 172
 173         if (csr->classifier_rule_en&PROTOCOLSRCPORTRANGE) {
 174                 i = ((port[0]<<8)&0xff00)+port[1];
 175                 if ((i < csr->srcport_lo) || (i > csr->srcport_hi))
 176                         return 1;
 177         }
 178
 179         if (csr->classifier_rule_en&PROTOCOLDSTPORTRANGE) {
 180                 i = ((port[2]<<8)&0xff00)+port[3];
 181                 if ((i < csr->dstport_lo) || (i > csr->dstport_hi))
 182                         return 1;
 183         }
 184
 185         return 0;
 186 }
 187
 188 static int get_qos_index(struct nic *nic, u8 *iph, u8 *tcpudph)
 189 {
 190         int ip_ver, i;
 191         struct qos_cb_s *qcb = &nic->qos;
 192
 193         if (iph == NULL || tcpudph == NULL)
 194                 return -1;
 195
 196         ip_ver = (iph[0]>>4)&0xf;
 197
 198         if (ip_ver != 4)
 199                 return -1;
 200
 201         for (i = 0; i < QOS_MAX; i++) {
 202                 if (!qcb->csr[i].enabled)
 203                         continue;
 204                 if (!qcb->csr[i].classifier_rule_en)
 205                         continue;
 206                 if (chk_ipv4_rule(&qcb->csr[i], iph, tcpudph) == 0)
 207                         return i;
 208         }
 209
 210         return -1;
 211 }
 212
 213 static void extract_qos_list(struct nic *nic, struct list_head *head)
 214 {
 215         struct qos_cb_s *qcb = &nic->qos;
 216         struct qos_entry_s *entry;
 217         int i;
 218
 219         INIT_LIST_HEAD(head);
 220
 221         for (i = 0; i < QOS_MAX; i++) {
 222                 if (!qcb->csr[i].enabled)
 223                         continue;
 224                 if (qcb->csr[i].qos_buf_count >= qcb->qos_limit_size)
 225                         continue;
 226                 if (list_empty(&qcb->qos_list[i]))
 227                         continue;
 228
 229                 entry = list_entry(qcb->qos_list[i].prev, struct qos_entry_s,
 230                                    list);
 231
 232                 list_move_tail(&entry->list, head);
 233                 qcb->csr[i].qos_buf_count++;
 234
 235                 if (!list_empty(&qcb->qos_list[i]))
 236                         netdev_warn(nic->netdev, "Index(%d) is piled!!\n", i);
 237         }
 238 }
 239
 240 static void send_qos_list(struct nic *nic, struct list_head *head)
 241 {
 242         struct qos_entry_s *entry, *n;
 243
 244         list_for_each_entry_safe(entry, n, head, list) {
 245                 list_del(&entry->list);
 246                 gdm_wimax_send_tx(entry->skb, entry->dev);
 247                 free_qos_entry(entry);
 248         }
 249 }
 250
 251 int gdm_qos_send_hci_pkt(struct sk_buff *skb, struct net_device *dev)
 252 {
 253         struct nic *nic = netdev_priv(dev);
 254         int index;
 255         struct qos_cb_s *qcb = &nic->qos;
 256         unsigned long flags;
 257         struct ethhdr *ethh = (struct ethhdr *)(skb->data + HCI_HEADER_SIZE);
 258         struct iphdr *iph = (struct iphdr *)((char *)ethh + ETH_HLEN);
 259         struct tcphdr *tcph;
 260         struct qos_entry_s *entry = NULL;
 261         struct list_head send_list;
 262         int ret = 0;
 263
 264         tcph = (struct tcphdr *)iph + iph->ihl*4;
 265
 266         if (ethh->h_proto == cpu_to_be16(ETH_P_IP)) {
 267                 if (qcb->qos_list_cnt && !qos_free_list.cnt) {
 268                         entry = alloc_qos_entry();
 269                         entry->skb = skb;
 270                         entry->dev = dev;
 271                         netdev_dbg(dev, "qcb->qos_list_cnt=%d\n",
 272                                    qcb->qos_list_cnt);
 273                 }
 274
 275                 spin_lock_irqsave(&qcb->qos_lock, flags);
 276                 if (qcb->qos_list_cnt) {
 277                         index = get_qos_index(nic, (u8 *)iph, (u8 *)tcph);
 278                         if (index == -1)
 279                                 index = qcb->qos_null_idx;
 280
 281                         if (!entry) {
 282                                 entry = alloc_qos_entry();
 283                                 entry->skb = skb;
 284                                 entry->dev = dev;
 285                         }
 286
 287                         list_add_tail(&entry->list, &qcb->qos_list[index]);
 288                         extract_qos_list(nic, &send_list);
 289                         spin_unlock_irqrestore(&qcb->qos_lock, flags);
 290                         send_qos_list(nic, &send_list);
 291                         goto out;
 292                 }
 293                 spin_unlock_irqrestore(&qcb->qos_lock, flags);
 294                 if (entry)
 295                         free_qos_entry(entry);
 296         }
 297
 298         ret = gdm_wimax_send_tx(skb, dev);
 299 out:
 300         return ret;
 301 }
 302
 303 static int get_csr(struct qos_cb_s *qcb, u32 sfid, int mode)
 304 {
 305         int i;
 306
 307         for (i = 0; i < qcb->qos_list_cnt; i++) {
 308                 if (qcb->csr[i].sfid == sfid)
 309                         return i;
 310         }
 311
 312         if (mode) {
 313                 for (i = 0; i < QOS_MAX; i++) {
 314                         if (!qcb->csr[i].enabled) {
 315                                 qcb->csr[i].enabled = true;
 316                                 qcb->qos_list_cnt++;
 317                                 return i;
 318                         }
 319                 }
 320         }
 321         return -1;
 322 }
 323
 324 #define QOS_CHANGE_DEL  0xFC
 325 #define QOS_ADD         0xFD
 326 #define QOS_REPORT      0xFE
 327
 328 void gdm_recv_qos_hci_packet(void *nic_ptr, u8 *buf, int size)
 329 {
 330         struct nic *nic = nic_ptr;
 331         int i, index, pos;
 332         u32 sfid;
 333         u8 sub_cmd_evt;
 334         struct qos_cb_s *qcb = &nic->qos;
 335         struct qos_entry_s *entry, *n;
 336         struct list_head send_list;
 337         struct list_head free_list;
 338         unsigned long flags;
 339
 340         sub_cmd_evt = (u8)buf[4];
 341
 342         if (sub_cmd_evt == QOS_REPORT) {
 343                 spin_lock_irqsave(&qcb->qos_lock, flags);
 344                 for (i = 0; i < qcb->qos_list_cnt; i++) {
 345                         sfid = ((buf[(i*5)+6]<<24)&0xff000000);
 346                         sfid += ((buf[(i*5)+7]<<16)&0xff0000);
 347                         sfid += ((buf[(i*5)+8]<<8)&0xff00);
 348                         sfid += (buf[(i*5)+9]);
 349                         index = get_csr(qcb, sfid, 0);
 350                         if (index == -1) {
 351                                 spin_unlock_irqrestore(&qcb->qos_lock, flags);
 352                                 netdev_err(nic->netdev, "QoS ERROR: No SF\n");
 353                                 return;
 354                         }
 355                         qcb->csr[index].qos_buf_count = buf[(i*5)+10];
 356                 }
 357
 358                 extract_qos_list(nic, &send_list);
 359                 spin_unlock_irqrestore(&qcb->qos_lock, flags);
 360                 send_qos_list(nic, &send_list);
 361                 return;
 362         }
 363
 364         /* sub_cmd_evt == QOS_ADD || sub_cmd_evt == QOS_CHANG_DEL */
 365         pos = 6;
 366         sfid = ((buf[pos++]<<24)&0xff000000);
 367         sfid += ((buf[pos++]<<16)&0xff0000);
 368         sfid += ((buf[pos++]<<8)&0xff00);
 369         sfid += (buf[pos++]);
 370
 371         index = get_csr(qcb, sfid, 1);
 372         if (index == -1) {
 373                 netdev_err(nic->netdev,
 374                            "QoS ERROR: csr Update Error / Wrong index (%d)\n",
 375                            index);
 376                 return;
 377         }
 378
 379         if (sub_cmd_evt == QOS_ADD) {
 380                 netdev_dbg(nic->netdev, "QOS_ADD SFID = 0x%x, index=%d\n",
 381                            sfid, index);
 382
 383                 spin_lock_irqsave(&qcb->qos_lock, flags);
 384                 qcb->csr[index].sfid = sfid;
 385                 qcb->csr[index].classifier_rule_en = ((buf[pos++]<<8)&0xff00);
 386                 qcb->csr[index].classifier_rule_en += buf[pos++];
 387                 if (qcb->csr[index].classifier_rule_en == 0)
 388                         qcb->qos_null_idx = index;
 389                 qcb->csr[index].ip2s_mask = buf[pos++];
 390                 qcb->csr[index].ip2s_lo = buf[pos++];
 391                 qcb->csr[index].ip2s_hi = buf[pos++];
 392                 qcb->csr[index].protocol = buf[pos++];
 393                 qcb->csr[index].ipsrc_addrmask[0] = buf[pos++];
 394                 qcb->csr[index].ipsrc_addrmask[1] = buf[pos++];
 395                 qcb->csr[index].ipsrc_addrmask[2] = buf[pos++];
 396                 qcb->csr[index].ipsrc_addrmask[3] = buf[pos++];
 397                 qcb->csr[index].ipsrc_addr[0] = buf[pos++];
 398                 qcb->csr[index].ipsrc_addr[1] = buf[pos++];
 399                 qcb->csr[index].ipsrc_addr[2] = buf[pos++];
 400                 qcb->csr[index].ipsrc_addr[3] = buf[pos++];
 401                 qcb->csr[index].ipdst_addrmask[0] = buf[pos++];
 402                 qcb->csr[index].ipdst_addrmask[1] = buf[pos++];
 403                 qcb->csr[index].ipdst_addrmask[2] = buf[pos++];
 404                 qcb->csr[index].ipdst_addrmask[3] = buf[pos++];
 405                 qcb->csr[index].ipdst_addr[0] = buf[pos++];
 406                 qcb->csr[index].ipdst_addr[1] = buf[pos++];
 407                 qcb->csr[index].ipdst_addr[2] = buf[pos++];
 408                 qcb->csr[index].ipdst_addr[3] = buf[pos++];
 409                 qcb->csr[index].srcport_lo = ((buf[pos++]<<8)&0xff00);
 410                 qcb->csr[index].srcport_lo += buf[pos++];
 411                 qcb->csr[index].srcport_hi = ((buf[pos++]<<8)&0xff00);
 412                 qcb->csr[index].srcport_hi += buf[pos++];
 413                 qcb->csr[index].dstport_lo = ((buf[pos++]<<8)&0xff00);
 414                 qcb->csr[index].dstport_lo += buf[pos++];
 415                 qcb->csr[index].dstport_hi = ((buf[pos++]<<8)&0xff00);
 416                 qcb->csr[index].dstport_hi += buf[pos++];
 417
 418                 qcb->qos_limit_size = 254/qcb->qos_list_cnt;
 419                 spin_unlock_irqrestore(&qcb->qos_lock, flags);
 420         } else if (sub_cmd_evt == QOS_CHANGE_DEL) {
 421                 netdev_dbg(nic->netdev, "QOS_CHANGE_DEL SFID = 0x%x, index=%d\n",
 422                            sfid, index);
 423
 424                 INIT_LIST_HEAD(&free_list);
 425
 426                 spin_lock_irqsave(&qcb->qos_lock, flags);
 427                 qcb->csr[index].enabled = false;
 428                 qcb->qos_list_cnt--;
 429                 qcb->qos_limit_size = 254/qcb->qos_list_cnt;
 430
 431                 list_for_each_entry_safe(entry, n, &qcb->qos_list[index],
 432                                          list) {
 433                         list_move_tail(&entry->list, &free_list);
 434                 }
 435                 spin_unlock_irqrestore(&qcb->qos_lock, flags);
 436                 free_qos_entry_list(&free_list);
 437         }
 438 }