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         entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
  58         return entry;
  59 }
  60
  61 static void free_qos_entry(void *entry)
  62 {
  63         struct qos_entry_s *qentry = (struct qos_entry_s *)entry;
  64         unsigned long flags;
  65
  66         spin_lock_irqsave(&qos_free_list.lock, flags);
  67         if (qos_free_list.cnt < MAX_FREE_LIST_CNT) {
  68                 list_add(&qentry->list, &qos_free_list.head);
  69                 qos_free_list.cnt++;
  70                 spin_unlock_irqrestore(&qos_free_list.lock, flags);
  71                 return;
  72         }
  73         spin_unlock_irqrestore(&qos_free_list.lock, flags);
  74
  75         kfree(entry);
  76 }
  77
  78 static void free_qos_entry_list(struct list_head *free_list)
  79 {
  80         struct qos_entry_s *entry, *n;
  81         int total_free = 0;
  82
  83         list_for_each_entry_safe(entry, n, free_list, list) {
  84                 list_del(&entry->list);
  85                 kfree(entry);
  86                 total_free++;
  87         }
  88
  89         pr_debug("%s: total_free_cnt=%d\n", __func__, total_free);
  90 }
  91
  92 void gdm_qos_init(void *nic_ptr)
  93 {
  94         struct nic *nic = nic_ptr;
  95         struct qos_cb_s *qcb = &nic->qos;
  96         int i;
  97
  98         for (i = 0; i < QOS_MAX; i++) {
  99                 INIT_LIST_HEAD(&qcb->qos_list[i]);
 100                 qcb->csr[i].qos_buf_count = 0;
 101                 qcb->csr[i].enabled = false;
 102         }
 103
 104         qcb->qos_list_cnt = 0;
 105         qcb->qos_null_idx = QOS_MAX-1;
 106         qcb->qos_limit_size = 255;
 107
 108         spin_lock_init(&qcb->qos_lock);
 109
 110         init_qos_entry_list();
 111 }
 112
 113 void gdm_qos_release_list(void *nic_ptr)
 114 {
 115         struct nic *nic = nic_ptr;
 116         struct qos_cb_s *qcb = &nic->qos;
 117         unsigned long flags;
 118         struct qos_entry_s *entry, *n;
 119         struct list_head free_list;
 120         int i;
 121
 122         INIT_LIST_HEAD(&free_list);
 123
 124         spin_lock_irqsave(&qcb->qos_lock, flags);
 125
 126         for (i = 0; i < QOS_MAX; i++) {
 127                 qcb->csr[i].qos_buf_count = 0;
 128                 qcb->csr[i].enabled = false;
 129         }
 130
 131         qcb->qos_list_cnt = 0;
 132         qcb->qos_null_idx = QOS_MAX-1;
 133
 134         for (i = 0; i < QOS_MAX; i++) {
 135                 list_for_each_entry_safe(entry, n, &qcb->qos_list[i], list) {
 136                         list_move_tail(&entry->list, &free_list);
 137                 }
 138         }
 139         spin_unlock_irqrestore(&qcb->qos_lock, flags);
 140         free_qos_entry_list(&free_list);
 141 }
 142
 143 static int chk_ipv4_rule(struct gdm_wimax_csr_s *csr, u8 *stream, u8 *port)
 144 {
 145         int i;
 146
 147         if (csr->classifier_rule_en&IPTYPEOFSERVICE) {
 148                 if (((stream[1] & csr->ip2s_mask) < csr->ip2s_lo) ||
 149                     ((stream[1] & csr->ip2s_mask) > csr->ip2s_hi))
 150                         return 1;
 151         }
 152
 153         if (csr->classifier_rule_en&PROTOCOL) {
 154                 if (stream[9] != csr->protocol)
 155                         return 1;
 156         }
 157
 158         if (csr->classifier_rule_en&IPMASKEDSRCADDRESS) {
 159                 for (i = 0; i < 4; i++) {
 160                         if ((stream[12 + i] & csr->ipsrc_addrmask[i]) !=
 161                         (csr->ipsrc_addr[i] & csr->ipsrc_addrmask[i]))
 162                                 return 1;
 163                 }
 164         }
 165
 166         if (csr->classifier_rule_en&IPMASKEDDSTADDRESS) {
 167                 for (i = 0; i < 4; i++) {
 168                         if ((stream[16 + i] & csr->ipdst_addrmask[i]) !=
 169                         (csr->ipdst_addr[i] & csr->ipdst_addrmask[i]))
 170                                 return 1;
 171                 }
 172         }
 173
 174         if (csr->classifier_rule_en&PROTOCOLSRCPORTRANGE) {
 175                 i = ((port[0]<<8)&0xff00)+port[1];
 176                 if ((i < csr->srcport_lo) || (i > csr->srcport_hi))
 177                         return 1;
 178         }
 179
 180         if (csr->classifier_rule_en&PROTOCOLDSTPORTRANGE) {
 181                 i = ((port[2]<<8)&0xff00)+port[3];
 182                 if ((i < csr->dstport_lo) || (i > csr->dstport_hi))
 183                         return 1;
 184         }
 185
 186         return 0;
 187 }
 188
 189 static int get_qos_index(struct nic *nic, u8 *iph, u8 *tcpudph)
 190 {
 191         int ip_ver, i;
 192         struct qos_cb_s *qcb = &nic->qos;
 193
 194         if (iph == NULL || tcpudph == NULL)
 195                 return -1;
 196
 197         ip_ver = (iph[0]>>4)&0xf;
 198
 199         if (ip_ver != 4)
 200                 return -1;
 201
 202         for (i = 0; i < QOS_MAX; i++) {
 203                 if (!qcb->csr[i].enabled)
 204                         continue;
 205                 if (!qcb->csr[i].classifier_rule_en)
 206                         continue;
 207                 if (chk_ipv4_rule(&qcb->csr[i], iph, tcpudph) == 0)
 208                         return i;
 209         }
 210
 211         return -1;
 212 }
 213
 214 static void extract_qos_list(struct nic *nic, struct list_head *head)
 215 {
 216         struct qos_cb_s *qcb = &nic->qos;
 217         struct qos_entry_s *entry;
 218         int i;
 219
 220         INIT_LIST_HEAD(head);
 221
 222         for (i = 0; i < QOS_MAX; i++) {
 223                 if (!qcb->csr[i].enabled)
 224                         continue;
 225                 if (qcb->csr[i].qos_buf_count >= qcb->qos_limit_size)
 226                         continue;
 227                 if (list_empty(&qcb->qos_list[i]))
 228                         continue;
 229
 230                 entry = list_entry(qcb->qos_list[i].prev, struct qos_entry_s,
 231                                    list);
 232
 233                 list_move_tail(&entry->list, head);
 234                 qcb->csr[i].qos_buf_count++;
 235
 236                 if (!list_empty(&qcb->qos_list[i]))
 237                         netdev_warn(nic->netdev, "Index(%d) is piled!!\n", i);
 238         }
 239 }
 240
 241 static void send_qos_list(struct nic *nic, struct list_head *head)
 242 {
 243         struct qos_entry_s *entry, *n;
 244
 245         list_for_each_entry_safe(entry, n, head, list) {
 246                 list_del(&entry->list);
 247                 gdm_wimax_send_tx(entry->skb, entry->dev);
 248                 free_qos_entry(entry);
 249         }
 250 }
 251
 252 int gdm_qos_send_hci_pkt(struct sk_buff *skb, struct net_device *dev)
 253 {
 254         struct nic *nic = netdev_priv(dev);
 255         int index;
 256         struct qos_cb_s *qcb = &nic->qos;
 257         unsigned long flags;
 258         struct ethhdr *ethh = (struct ethhdr *)(skb->data + HCI_HEADER_SIZE);
 259         struct iphdr *iph = (struct iphdr *)((char *)ethh + ETH_HLEN);
 260         struct tcphdr *tcph;
 261         struct qos_entry_s *entry = NULL;
 262         struct list_head send_list;
 263         int ret = 0;
 264
 265         tcph = (struct tcphdr *)iph + iph->ihl*4;
 266
 267         if (ethh->h_proto == cpu_to_be16(ETH_P_IP)) {
 268                 if (qcb->qos_list_cnt && !qos_free_list.cnt) {
 269                         entry = alloc_qos_entry();
 270                         entry->skb = skb;
 271                         entry->dev = dev;
 272                         netdev_dbg(dev, "qcb->qos_list_cnt=%d\n",
 273                                    qcb->qos_list_cnt);
 274                 }
 275
 276                 spin_lock_irqsave(&qcb->qos_lock, flags);
 277                 if (qcb->qos_list_cnt) {
 278                         index = get_qos_index(nic, (u8 *)iph, (u8 *)tcph);
 279                         if (index == -1)
 280                                 index = qcb->qos_null_idx;
 281
 282                         if (!entry) {
 283                                 entry = alloc_qos_entry();
 284                                 entry->skb = skb;
 285                                 entry->dev = dev;
 286                         }
 287
 288                         list_add_tail(&entry->list, &qcb->qos_list[index]);
 289                         extract_qos_list(nic, &send_list);
 290                         spin_unlock_irqrestore(&qcb->qos_lock, flags);
 291                         send_qos_list(nic, &send_list);
 292                         goto out;
 293                 }
 294                 spin_unlock_irqrestore(&qcb->qos_lock, flags);
 295                 if (entry)
 296                         free_qos_entry(entry);
 297         }
 298
 299         ret = gdm_wimax_send_tx(skb, dev);
 300 out:
 301         return ret;
 302 }
 303
 304 static int get_csr(struct qos_cb_s *qcb, u32 sfid, int mode)
 305 {
 306         int i;
 307
 308         for (i = 0; i < qcb->qos_list_cnt; i++) {
 309                 if (qcb->csr[i].sfid == sfid)
 310                         return i;
 311         }
 312
 313         if (mode) {
 314                 for (i = 0; i < QOS_MAX; i++) {
 315                         if (!qcb->csr[i].enabled) {
 316                                 qcb->csr[i].enabled = true;
 317                                 qcb->qos_list_cnt++;
 318                                 return i;
 319                         }
 320                 }
 321         }
 322         return -1;
 323 }
 324
 325 #define QOS_CHANGE_DEL  0xFC
 326 #define QOS_ADD         0xFD
 327 #define QOS_REPORT      0xFE
 328
 329 void gdm_recv_qos_hci_packet(void *nic_ptr, u8 *buf, int size)
 330 {
 331         struct nic *nic = nic_ptr;
 332         int i, index, pos;
 333         u32 sfid;
 334         u8 sub_cmd_evt;
 335         struct qos_cb_s *qcb = &nic->qos;
 336         struct qos_entry_s *entry, *n;
 337         struct list_head send_list;
 338         struct list_head free_list;
 339         unsigned long flags;
 340
 341         sub_cmd_evt = (u8)buf[4];
 342
 343         if (sub_cmd_evt == QOS_REPORT) {
 344                 spin_lock_irqsave(&qcb->qos_lock, flags);
 345                 for (i = 0; i < qcb->qos_list_cnt; i++) {
 346                         sfid = ((buf[(i*5)+6]<<24)&0xff000000);
 347                         sfid += ((buf[(i*5)+7]<<16)&0xff0000);
 348                         sfid += ((buf[(i*5)+8]<<8)&0xff00);
 349                         sfid += (buf[(i*5)+9]);
 350                         index = get_csr(qcb, sfid, 0);
 351                         if (index == -1) {
 352                                 spin_unlock_irqrestore(&qcb->qos_lock, flags);
 353                                 netdev_err(nic->netdev, "QoS ERROR: No SF\n");
 354                                 return;
 355                         }
 356                         qcb->csr[index].qos_buf_count = buf[(i*5)+10];
 357                 }
 358
 359                 extract_qos_list(nic, &send_list);
 360                 spin_unlock_irqrestore(&qcb->qos_lock, flags);
 361                 send_qos_list(nic, &send_list);
 362                 return;
 363         }
 364
 365         /* sub_cmd_evt == QOS_ADD || sub_cmd_evt == QOS_CHANG_DEL */
 366         pos = 6;
 367         sfid = ((buf[pos++]<<24)&0xff000000);
 368         sfid += ((buf[pos++]<<16)&0xff0000);
 369         sfid += ((buf[pos++]<<8)&0xff00);
 370         sfid += (buf[pos++]);
 371
 372         index = get_csr(qcb, sfid, 1);
 373         if (index == -1) {
 374                 netdev_err(nic->netdev,
 375                            "QoS ERROR: csr Update Error / Wrong index (%d)\n",
 376                            index);
 377                 return;
 378         }
 379
 380         if (sub_cmd_evt == QOS_ADD) {
 381                 netdev_dbg(nic->netdev, "QOS_ADD SFID = 0x%x, index=%d\n",
 382                            sfid, index);
 383
 384                 spin_lock_irqsave(&qcb->qos_lock, flags);
 385                 qcb->csr[index].sfid = sfid;
 386                 qcb->csr[index].classifier_rule_en = ((buf[pos++]<<8)&0xff00);
 387                 qcb->csr[index].classifier_rule_en += buf[pos++];
 388                 if (qcb->csr[index].classifier_rule_en == 0)
 389                         qcb->qos_null_idx = index;
 390                 qcb->csr[index].ip2s_mask = buf[pos++];
 391                 qcb->csr[index].ip2s_lo = buf[pos++];
 392                 qcb->csr[index].ip2s_hi = buf[pos++];
 393                 qcb->csr[index].protocol = buf[pos++];
 394                 qcb->csr[index].ipsrc_addrmask[0] = buf[pos++];
 395                 qcb->csr[index].ipsrc_addrmask[1] = buf[pos++];
 396                 qcb->csr[index].ipsrc_addrmask[2] = buf[pos++];
 397                 qcb->csr[index].ipsrc_addrmask[3] = buf[pos++];
 398                 qcb->csr[index].ipsrc_addr[0] = buf[pos++];
 399                 qcb->csr[index].ipsrc_addr[1] = buf[pos++];
 400                 qcb->csr[index].ipsrc_addr[2] = buf[pos++];
 401                 qcb->csr[index].ipsrc_addr[3] = buf[pos++];
 402                 qcb->csr[index].ipdst_addrmask[0] = buf[pos++];
 403                 qcb->csr[index].ipdst_addrmask[1] = buf[pos++];
 404                 qcb->csr[index].ipdst_addrmask[2] = buf[pos++];
 405                 qcb->csr[index].ipdst_addrmask[3] = buf[pos++];
 406                 qcb->csr[index].ipdst_addr[0] = buf[pos++];
 407                 qcb->csr[index].ipdst_addr[1] = buf[pos++];
 408                 qcb->csr[index].ipdst_addr[2] = buf[pos++];
 409                 qcb->csr[index].ipdst_addr[3] = buf[pos++];
 410                 qcb->csr[index].srcport_lo = ((buf[pos++]<<8)&0xff00);
 411                 qcb->csr[index].srcport_lo += buf[pos++];
 412                 qcb->csr[index].srcport_hi = ((buf[pos++]<<8)&0xff00);
 413                 qcb->csr[index].srcport_hi += buf[pos++];
 414                 qcb->csr[index].dstport_lo = ((buf[pos++]<<8)&0xff00);
 415                 qcb->csr[index].dstport_lo += buf[pos++];
 416                 qcb->csr[index].dstport_hi = ((buf[pos++]<<8)&0xff00);
 417                 qcb->csr[index].dstport_hi += buf[pos++];
 418
 419                 qcb->qos_limit_size = 254/qcb->qos_list_cnt;
 420                 spin_unlock_irqrestore(&qcb->qos_lock, flags);
 421         } else if (sub_cmd_evt == QOS_CHANGE_DEL) {
 422                 netdev_dbg(nic->netdev, "QOS_CHANGE_DEL SFID = 0x%x, index=%d\n",
 423                            sfid, index);
 424
 425                 INIT_LIST_HEAD(&free_list);
 426
 427                 spin_lock_irqsave(&qcb->qos_lock, flags);
 428                 qcb->csr[index].enabled = false;
 429                 qcb->qos_list_cnt--;
 430                 qcb->qos_limit_size = 254/qcb->qos_list_cnt;
 431
 432                 list_for_each_entry_safe(entry, n, &qcb->qos_list[index],
 433                                          list) {
 434                         list_move_tail(&entry->list, &free_list);
 435                 }
 436                 spin_unlock_irqrestore(&qcb->qos_lock, flags);
 437                 free_qos_entry_list(&free_list);
 438         }
 439 }