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