linux/drivers/net/ethernet/ti/netcp_core.c
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   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Keystone NetCP Core driver
   4 *
   5 * Copyright (C) 2014 Texas Instruments Incorporated
   6 * Authors:     Sandeep Nair <sandeep_n@ti.com>
   7 *              Sandeep Paulraj <s-paulraj@ti.com>
   8 *              Cyril Chemparathy <cyril@ti.com>
   9 *              Santosh Shilimkar <santosh.shilimkar@ti.com>
  10 *              Murali Karicheri <m-karicheri2@ti.com>
  11 *              Wingman Kwok <w-kwok2@ti.com>
  12 */
  13
  14#include <linux/io.h>
  15#include <linux/module.h>
  16#include <linux/of_net.h>
  17#include <linux/of_address.h>
  18#include <linux/if_vlan.h>
  19#include <linux/pm_runtime.h>
  20#include <linux/platform_device.h>
  21#include <linux/soc/ti/knav_qmss.h>
  22#include <linux/soc/ti/knav_dma.h>
  23
  24#include "netcp.h"
  25
  26#define NETCP_SOP_OFFSET        (NET_IP_ALIGN + NET_SKB_PAD)
  27#define NETCP_NAPI_WEIGHT       64
  28#define NETCP_TX_TIMEOUT        (5 * HZ)
  29#define NETCP_PACKET_SIZE       (ETH_FRAME_LEN + ETH_FCS_LEN)
  30#define NETCP_MIN_PACKET_SIZE   ETH_ZLEN
  31#define NETCP_MAX_MCAST_ADDR    16
  32
  33#define NETCP_EFUSE_REG_INDEX   0
  34
  35#define NETCP_MOD_PROBE_SKIPPED 1
  36#define NETCP_MOD_PROBE_FAILED  2
  37
  38#define NETCP_DEBUG (NETIF_MSG_HW       | NETIF_MSG_WOL         |       \
  39                    NETIF_MSG_DRV       | NETIF_MSG_LINK        |       \
  40                    NETIF_MSG_IFUP      | NETIF_MSG_INTR        |       \
  41                    NETIF_MSG_PROBE     | NETIF_MSG_TIMER       |       \
  42                    NETIF_MSG_IFDOWN    | NETIF_MSG_RX_ERR      |       \
  43                    NETIF_MSG_TX_ERR    | NETIF_MSG_TX_DONE     |       \
  44                    NETIF_MSG_PKTDATA   | NETIF_MSG_TX_QUEUED   |       \
  45                    NETIF_MSG_RX_STATUS)
  46
  47#define NETCP_EFUSE_ADDR_SWAP   2
  48
  49#define knav_queue_get_id(q)    knav_queue_device_control(q, \
  50                                KNAV_QUEUE_GET_ID, (unsigned long)NULL)
  51
  52#define knav_queue_enable_notify(q) knav_queue_device_control(q,        \
  53                                        KNAV_QUEUE_ENABLE_NOTIFY,       \
  54                                        (unsigned long)NULL)
  55
  56#define knav_queue_disable_notify(q) knav_queue_device_control(q,       \
  57                                        KNAV_QUEUE_DISABLE_NOTIFY,      \
  58                                        (unsigned long)NULL)
  59
  60#define knav_queue_get_count(q) knav_queue_device_control(q, \
  61                                KNAV_QUEUE_GET_COUNT, (unsigned long)NULL)
  62
  63#define for_each_netcp_module(module)                   \
  64        list_for_each_entry(module, &netcp_modules, module_list)
  65
  66#define for_each_netcp_device_module(netcp_device, inst_modpriv) \
  67        list_for_each_entry(inst_modpriv, \
  68                &((netcp_device)->modpriv_head), inst_list)
  69
  70#define for_each_module(netcp, intf_modpriv)                    \
  71        list_for_each_entry(intf_modpriv, &netcp->module_head, intf_list)
  72
  73/* Module management structures */
  74struct netcp_device {
  75        struct list_head        device_list;
  76        struct list_head        interface_head;
  77        struct list_head        modpriv_head;
  78        struct device           *device;
  79};
  80
  81struct netcp_inst_modpriv {
  82        struct netcp_device     *netcp_device;
  83        struct netcp_module     *netcp_module;
  84        struct list_head        inst_list;
  85        void                    *module_priv;
  86};
  87
  88struct netcp_intf_modpriv {
  89        struct netcp_intf       *netcp_priv;
  90        struct netcp_module     *netcp_module;
  91        struct list_head        intf_list;
  92        void                    *module_priv;
  93};
  94
  95struct netcp_tx_cb {
  96        void    *ts_context;
  97        void    (*txtstamp)(void *context, struct sk_buff *skb);
  98};
  99
 100static LIST_HEAD(netcp_devices);
 101static LIST_HEAD(netcp_modules);
 102static DEFINE_MUTEX(netcp_modules_lock);
 103
 104static int netcp_debug_level = -1;
 105module_param(netcp_debug_level, int, 0);
 106MODULE_PARM_DESC(netcp_debug_level, "Netcp debug level (NETIF_MSG bits) (0=none,...,16=all)");
 107
 108/* Helper functions - Get/Set */
 109static void get_pkt_info(dma_addr_t *buff, u32 *buff_len, dma_addr_t *ndesc,
 110                         struct knav_dma_desc *desc)
 111{
 112        *buff_len = le32_to_cpu(desc->buff_len);
 113        *buff = le32_to_cpu(desc->buff);
 114        *ndesc = le32_to_cpu(desc->next_desc);
 115}
 116
 117static void get_desc_info(u32 *desc_info, u32 *pkt_info,
 118                          struct knav_dma_desc *desc)
 119{
 120        *desc_info = le32_to_cpu(desc->desc_info);
 121        *pkt_info = le32_to_cpu(desc->packet_info);
 122}
 123
 124static u32 get_sw_data(int index, struct knav_dma_desc *desc)
 125{
 126        /* No Endian conversion needed as this data is untouched by hw */
 127        return desc->sw_data[index];
 128}
 129
 130/* use these macros to get sw data */
 131#define GET_SW_DATA0(desc) get_sw_data(0, desc)
 132#define GET_SW_DATA1(desc) get_sw_data(1, desc)
 133#define GET_SW_DATA2(desc) get_sw_data(2, desc)
 134#define GET_SW_DATA3(desc) get_sw_data(3, desc)
 135
 136static void get_org_pkt_info(dma_addr_t *buff, u32 *buff_len,
 137                             struct knav_dma_desc *desc)
 138{
 139        *buff = le32_to_cpu(desc->orig_buff);
 140        *buff_len = le32_to_cpu(desc->orig_len);
 141}
 142
 143static void get_words(dma_addr_t *words, int num_words, __le32 *desc)
 144{
 145        int i;
 146
 147        for (i = 0; i < num_words; i++)
 148                words[i] = le32_to_cpu(desc[i]);
 149}
 150
 151static void set_pkt_info(dma_addr_t buff, u32 buff_len, u32 ndesc,
 152                         struct knav_dma_desc *desc)
 153{
 154        desc->buff_len = cpu_to_le32(buff_len);
 155        desc->buff = cpu_to_le32(buff);
 156        desc->next_desc = cpu_to_le32(ndesc);
 157}
 158
 159static void set_desc_info(u32 desc_info, u32 pkt_info,
 160                          struct knav_dma_desc *desc)
 161{
 162        desc->desc_info = cpu_to_le32(desc_info);
 163        desc->packet_info = cpu_to_le32(pkt_info);
 164}
 165
 166static void set_sw_data(int index, u32 data, struct knav_dma_desc *desc)
 167{
 168        /* No Endian conversion needed as this data is untouched by hw */
 169        desc->sw_data[index] = data;
 170}
 171
 172/* use these macros to set sw data */
 173#define SET_SW_DATA0(data, desc) set_sw_data(0, data, desc)
 174#define SET_SW_DATA1(data, desc) set_sw_data(1, data, desc)
 175#define SET_SW_DATA2(data, desc) set_sw_data(2, data, desc)
 176#define SET_SW_DATA3(data, desc) set_sw_data(3, data, desc)
 177
 178static void set_org_pkt_info(dma_addr_t buff, u32 buff_len,
 179                             struct knav_dma_desc *desc)
 180{
 181        desc->orig_buff = cpu_to_le32(buff);
 182        desc->orig_len = cpu_to_le32(buff_len);
 183}
 184
 185static void set_words(u32 *words, int num_words, __le32 *desc)
 186{
 187        int i;
 188
 189        for (i = 0; i < num_words; i++)
 190                desc[i] = cpu_to_le32(words[i]);
 191}
 192
 193/* Read the e-fuse value as 32 bit values to be endian independent */
 194static int emac_arch_get_mac_addr(char *x, void __iomem *efuse_mac, u32 swap)
 195{
 196        unsigned int addr0, addr1;
 197
 198        addr1 = readl(efuse_mac + 4);
 199        addr0 = readl(efuse_mac);
 200
 201        switch (swap) {
 202        case NETCP_EFUSE_ADDR_SWAP:
 203                addr0 = addr1;
 204                addr1 = readl(efuse_mac);
 205                break;
 206        default:
 207                break;
 208        }
 209
 210        x[0] = (addr1 & 0x0000ff00) >> 8;
 211        x[1] = addr1 & 0x000000ff;
 212        x[2] = (addr0 & 0xff000000) >> 24;
 213        x[3] = (addr0 & 0x00ff0000) >> 16;
 214        x[4] = (addr0 & 0x0000ff00) >> 8;
 215        x[5] = addr0 & 0x000000ff;
 216
 217        return 0;
 218}
 219
 220/* Module management routines */
 221static int netcp_register_interface(struct netcp_intf *netcp)
 222{
 223        int ret;
 224
 225        ret = register_netdev(netcp->ndev);
 226        if (!ret)
 227                netcp->netdev_registered = true;
 228        return ret;
 229}
 230
 231static int netcp_module_probe(struct netcp_device *netcp_device,
 232                              struct netcp_module *module)
 233{
 234        struct device *dev = netcp_device->device;
 235        struct device_node *devices, *interface, *node = dev->of_node;
 236        struct device_node *child;
 237        struct netcp_inst_modpriv *inst_modpriv;
 238        struct netcp_intf *netcp_intf;
 239        struct netcp_module *tmp;
 240        bool primary_module_registered = false;
 241        int ret;
 242
 243        /* Find this module in the sub-tree for this device */
 244        devices = of_get_child_by_name(node, "netcp-devices");
 245        if (!devices) {
 246                dev_err(dev, "could not find netcp-devices node\n");
 247                return NETCP_MOD_PROBE_SKIPPED;
 248        }
 249
 250        for_each_available_child_of_node(devices, child) {
 251                const char *name;
 252                char node_name[32];
 253
 254                if (of_property_read_string(child, "label", &name) < 0) {
 255                        snprintf(node_name, sizeof(node_name), "%pOFn", child);
 256                        name = node_name;
 257                }
 258                if (!strcasecmp(module->name, name))
 259                        break;
 260        }
 261
 262        of_node_put(devices);
 263        /* If module not used for this device, skip it */
 264        if (!child) {
 265                dev_warn(dev, "module(%s) not used for device\n", module->name);
 266                return NETCP_MOD_PROBE_SKIPPED;
 267        }
 268
 269        inst_modpriv = devm_kzalloc(dev, sizeof(*inst_modpriv), GFP_KERNEL);
 270        if (!inst_modpriv) {
 271                of_node_put(child);
 272                return -ENOMEM;
 273        }
 274
 275        inst_modpriv->netcp_device = netcp_device;
 276        inst_modpriv->netcp_module = module;
 277        list_add_tail(&inst_modpriv->inst_list, &netcp_device->modpriv_head);
 278
 279        ret = module->probe(netcp_device, dev, child,
 280                            &inst_modpriv->module_priv);
 281        of_node_put(child);
 282        if (ret) {
 283                dev_err(dev, "Probe of module(%s) failed with %d\n",
 284                        module->name, ret);
 285                list_del(&inst_modpriv->inst_list);
 286                devm_kfree(dev, inst_modpriv);
 287                return NETCP_MOD_PROBE_FAILED;
 288        }
 289
 290        /* Attach modules only if the primary module is probed */
 291        for_each_netcp_module(tmp) {
 292                if (tmp->primary)
 293                        primary_module_registered = true;
 294        }
 295
 296        if (!primary_module_registered)
 297                return 0;
 298
 299        /* Attach module to interfaces */
 300        list_for_each_entry(netcp_intf, &netcp_device->interface_head,
 301                            interface_list) {
 302                struct netcp_intf_modpriv *intf_modpriv;
 303
 304                intf_modpriv = devm_kzalloc(dev, sizeof(*intf_modpriv),
 305                                            GFP_KERNEL);
 306                if (!intf_modpriv)
 307                        return -ENOMEM;
 308
 309                interface = of_parse_phandle(netcp_intf->node_interface,
 310                                             module->name, 0);
 311
 312                if (!interface) {
 313                        devm_kfree(dev, intf_modpriv);
 314                        continue;
 315                }
 316
 317                intf_modpriv->netcp_priv = netcp_intf;
 318                intf_modpriv->netcp_module = module;
 319                list_add_tail(&intf_modpriv->intf_list,
 320                              &netcp_intf->module_head);
 321
 322                ret = module->attach(inst_modpriv->module_priv,
 323                                     netcp_intf->ndev, interface,
 324                                     &intf_modpriv->module_priv);
 325                of_node_put(interface);
 326                if (ret) {
 327                        dev_dbg(dev, "Attach of module %s declined with %d\n",
 328                                module->name, ret);
 329                        list_del(&intf_modpriv->intf_list);
 330                        devm_kfree(dev, intf_modpriv);
 331                        continue;
 332                }
 333        }
 334
 335        /* Now register the interface with netdev */
 336        list_for_each_entry(netcp_intf,
 337                            &netcp_device->interface_head,
 338                            interface_list) {
 339                /* If interface not registered then register now */
 340                if (!netcp_intf->netdev_registered) {
 341                        ret = netcp_register_interface(netcp_intf);
 342                        if (ret)
 343                                return -ENODEV;
 344                }
 345        }
 346        return 0;
 347}
 348
 349int netcp_register_module(struct netcp_module *module)
 350{
 351        struct netcp_device *netcp_device;
 352        struct netcp_module *tmp;
 353        int ret;
 354
 355        if (!module->name) {
 356                WARN(1, "error registering netcp module: no name\n");
 357                return -EINVAL;
 358        }
 359
 360        if (!module->probe) {
 361                WARN(1, "error registering netcp module: no probe\n");
 362                return -EINVAL;
 363        }
 364
 365        mutex_lock(&netcp_modules_lock);
 366
 367        for_each_netcp_module(tmp) {
 368                if (!strcasecmp(tmp->name, module->name)) {
 369                        mutex_unlock(&netcp_modules_lock);
 370                        return -EEXIST;
 371                }
 372        }
 373        list_add_tail(&module->module_list, &netcp_modules);
 374
 375        list_for_each_entry(netcp_device, &netcp_devices, device_list) {
 376                ret = netcp_module_probe(netcp_device, module);
 377                if (ret < 0)
 378                        goto fail;
 379        }
 380        mutex_unlock(&netcp_modules_lock);
 381        return 0;
 382
 383fail:
 384        mutex_unlock(&netcp_modules_lock);
 385        netcp_unregister_module(module);
 386        return ret;
 387}
 388EXPORT_SYMBOL_GPL(netcp_register_module);
 389
 390static void netcp_release_module(struct netcp_device *netcp_device,
 391                                 struct netcp_module *module)
 392{
 393        struct netcp_inst_modpriv *inst_modpriv, *inst_tmp;
 394        struct netcp_intf *netcp_intf, *netcp_tmp;
 395        struct device *dev = netcp_device->device;
 396
 397        /* Release the module from each interface */
 398        list_for_each_entry_safe(netcp_intf, netcp_tmp,
 399                                 &netcp_device->interface_head,
 400                                 interface_list) {
 401                struct netcp_intf_modpriv *intf_modpriv, *intf_tmp;
 402
 403                list_for_each_entry_safe(intf_modpriv, intf_tmp,
 404                                         &netcp_intf->module_head,
 405                                         intf_list) {
 406                        if (intf_modpriv->netcp_module == module) {
 407                                module->release(intf_modpriv->module_priv);
 408                                list_del(&intf_modpriv->intf_list);
 409                                devm_kfree(dev, intf_modpriv);
 410                                break;
 411                        }
 412                }
 413        }
 414
 415        /* Remove the module from each instance */
 416        list_for_each_entry_safe(inst_modpriv, inst_tmp,
 417                                 &netcp_device->modpriv_head, inst_list) {
 418                if (inst_modpriv->netcp_module == module) {
 419                        module->remove(netcp_device,
 420                                       inst_modpriv->module_priv);
 421                        list_del(&inst_modpriv->inst_list);
 422                        devm_kfree(dev, inst_modpriv);
 423                        break;
 424                }
 425        }
 426}
 427
 428void netcp_unregister_module(struct netcp_module *module)
 429{
 430        struct netcp_device *netcp_device;
 431        struct netcp_module *module_tmp;
 432
 433        mutex_lock(&netcp_modules_lock);
 434
 435        list_for_each_entry(netcp_device, &netcp_devices, device_list) {
 436                netcp_release_module(netcp_device, module);
 437        }
 438
 439        /* Remove the module from the module list */
 440        for_each_netcp_module(module_tmp) {
 441                if (module == module_tmp) {
 442                        list_del(&module->module_list);
 443                        break;
 444                }
 445        }
 446
 447        mutex_unlock(&netcp_modules_lock);
 448}
 449EXPORT_SYMBOL_GPL(netcp_unregister_module);
 450
 451void *netcp_module_get_intf_data(struct netcp_module *module,
 452                                 struct netcp_intf *intf)
 453{
 454        struct netcp_intf_modpriv *intf_modpriv;
 455
 456        list_for_each_entry(intf_modpriv, &intf->module_head, intf_list)
 457                if (intf_modpriv->netcp_module == module)
 458                        return intf_modpriv->module_priv;
 459        return NULL;
 460}
 461EXPORT_SYMBOL_GPL(netcp_module_get_intf_data);
 462
 463/* Module TX and RX Hook management */
 464struct netcp_hook_list {
 465        struct list_head         list;
 466        netcp_hook_rtn          *hook_rtn;
 467        void                    *hook_data;
 468        int                      order;
 469};
 470
 471int netcp_register_txhook(struct netcp_intf *netcp_priv, int order,
 472                          netcp_hook_rtn *hook_rtn, void *hook_data)
 473{
 474        struct netcp_hook_list *entry;
 475        struct netcp_hook_list *next;
 476        unsigned long flags;
 477
 478        entry = devm_kzalloc(netcp_priv->dev, sizeof(*entry), GFP_KERNEL);
 479        if (!entry)
 480                return -ENOMEM;
 481
 482        entry->hook_rtn  = hook_rtn;
 483        entry->hook_data = hook_data;
 484        entry->order     = order;
 485
 486        spin_lock_irqsave(&netcp_priv->lock, flags);
 487        list_for_each_entry(next, &netcp_priv->txhook_list_head, list) {
 488                if (next->order > order)
 489                        break;
 490        }
 491        __list_add(&entry->list, next->list.prev, &next->list);
 492        spin_unlock_irqrestore(&netcp_priv->lock, flags);
 493
 494        return 0;
 495}
 496EXPORT_SYMBOL_GPL(netcp_register_txhook);
 497
 498int netcp_unregister_txhook(struct netcp_intf *netcp_priv, int order,
 499                            netcp_hook_rtn *hook_rtn, void *hook_data)
 500{
 501        struct netcp_hook_list *next, *n;
 502        unsigned long flags;
 503
 504        spin_lock_irqsave(&netcp_priv->lock, flags);
 505        list_for_each_entry_safe(next, n, &netcp_priv->txhook_list_head, list) {
 506                if ((next->order     == order) &&
 507                    (next->hook_rtn  == hook_rtn) &&
 508                    (next->hook_data == hook_data)) {
 509                        list_del(&next->list);
 510                        spin_unlock_irqrestore(&netcp_priv->lock, flags);
 511                        devm_kfree(netcp_priv->dev, next);
 512                        return 0;
 513                }
 514        }
 515        spin_unlock_irqrestore(&netcp_priv->lock, flags);
 516        return -ENOENT;
 517}
 518EXPORT_SYMBOL_GPL(netcp_unregister_txhook);
 519
 520int netcp_register_rxhook(struct netcp_intf *netcp_priv, int order,
 521                          netcp_hook_rtn *hook_rtn, void *hook_data)
 522{
 523        struct netcp_hook_list *entry;
 524        struct netcp_hook_list *next;
 525        unsigned long flags;
 526
 527        entry = devm_kzalloc(netcp_priv->dev, sizeof(*entry), GFP_KERNEL);
 528        if (!entry)
 529                return -ENOMEM;
 530
 531        entry->hook_rtn  = hook_rtn;
 532        entry->hook_data = hook_data;
 533        entry->order     = order;
 534
 535        spin_lock_irqsave(&netcp_priv->lock, flags);
 536        list_for_each_entry(next, &netcp_priv->rxhook_list_head, list) {
 537                if (next->order > order)
 538                        break;
 539        }
 540        __list_add(&entry->list, next->list.prev, &next->list);
 541        spin_unlock_irqrestore(&netcp_priv->lock, flags);
 542
 543        return 0;
 544}
 545EXPORT_SYMBOL_GPL(netcp_register_rxhook);
 546
 547int netcp_unregister_rxhook(struct netcp_intf *netcp_priv, int order,
 548                            netcp_hook_rtn *hook_rtn, void *hook_data)
 549{
 550        struct netcp_hook_list *next, *n;
 551        unsigned long flags;
 552
 553        spin_lock_irqsave(&netcp_priv->lock, flags);
 554        list_for_each_entry_safe(next, n, &netcp_priv->rxhook_list_head, list) {
 555                if ((next->order     == order) &&
 556                    (next->hook_rtn  == hook_rtn) &&
 557                    (next->hook_data == hook_data)) {
 558                        list_del(&next->list);
 559                        spin_unlock_irqrestore(&netcp_priv->lock, flags);
 560                        devm_kfree(netcp_priv->dev, next);
 561                        return 0;
 562                }
 563        }
 564        spin_unlock_irqrestore(&netcp_priv->lock, flags);
 565
 566        return -ENOENT;
 567}
 568EXPORT_SYMBOL_GPL(netcp_unregister_rxhook);
 569
 570static void netcp_frag_free(bool is_frag, void *ptr)
 571{
 572        if (is_frag)
 573                skb_free_frag(ptr);
 574        else
 575                kfree(ptr);
 576}
 577
 578static void netcp_free_rx_desc_chain(struct netcp_intf *netcp,
 579                                     struct knav_dma_desc *desc)
 580{
 581        struct knav_dma_desc *ndesc;
 582        dma_addr_t dma_desc, dma_buf;
 583        unsigned int buf_len, dma_sz = sizeof(*ndesc);
 584        void *buf_ptr;
 585        u32 tmp;
 586
 587        get_words(&dma_desc, 1, &desc->next_desc);
 588
 589        while (dma_desc) {
 590                ndesc = knav_pool_desc_unmap(netcp->rx_pool, dma_desc, dma_sz);
 591                if (unlikely(!ndesc)) {
 592                        dev_err(netcp->ndev_dev, "failed to unmap Rx desc\n");
 593                        break;
 594                }
 595                get_pkt_info(&dma_buf, &tmp, &dma_desc, ndesc);
 596                /* warning!!!! We are retrieving the virtual ptr in the sw_data
 597                 * field as a 32bit value. Will not work on 64bit machines
 598                 */
 599                buf_ptr = (void *)GET_SW_DATA0(ndesc);
 600                buf_len = (int)GET_SW_DATA1(desc);
 601                dma_unmap_page(netcp->dev, dma_buf, PAGE_SIZE, DMA_FROM_DEVICE);
 602                __free_page(buf_ptr);
 603                knav_pool_desc_put(netcp->rx_pool, desc);
 604        }
 605        /* warning!!!! We are retrieving the virtual ptr in the sw_data
 606         * field as a 32bit value. Will not work on 64bit machines
 607         */
 608        buf_ptr = (void *)GET_SW_DATA0(desc);
 609        buf_len = (int)GET_SW_DATA1(desc);
 610
 611        if (buf_ptr)
 612                netcp_frag_free(buf_len <= PAGE_SIZE, buf_ptr);
 613        knav_pool_desc_put(netcp->rx_pool, desc);
 614}
 615
 616static void netcp_empty_rx_queue(struct netcp_intf *netcp)
 617{
 618        struct netcp_stats *rx_stats = &netcp->stats;
 619        struct knav_dma_desc *desc;
 620        unsigned int dma_sz;
 621        dma_addr_t dma;
 622
 623        for (; ;) {
 624                dma = knav_queue_pop(netcp->rx_queue, &dma_sz);
 625                if (!dma)
 626                        break;
 627
 628                desc = knav_pool_desc_unmap(netcp->rx_pool, dma, dma_sz);
 629                if (unlikely(!desc)) {
 630                        dev_err(netcp->ndev_dev, "%s: failed to unmap Rx desc\n",
 631                                __func__);
 632                        rx_stats->rx_errors++;
 633                        continue;
 634                }
 635                netcp_free_rx_desc_chain(netcp, desc);
 636                rx_stats->rx_dropped++;
 637        }
 638}
 639
 640static int netcp_process_one_rx_packet(struct netcp_intf *netcp)
 641{
 642        struct netcp_stats *rx_stats = &netcp->stats;
 643        unsigned int dma_sz, buf_len, org_buf_len;
 644        struct knav_dma_desc *desc, *ndesc;
 645        unsigned int pkt_sz = 0, accum_sz;
 646        struct netcp_hook_list *rx_hook;
 647        dma_addr_t dma_desc, dma_buff;
 648        struct netcp_packet p_info;
 649        struct sk_buff *skb;
 650        void *org_buf_ptr;
 651        u32 tmp;
 652
 653        dma_desc = knav_queue_pop(netcp->rx_queue, &dma_sz);
 654        if (!dma_desc)
 655                return -1;
 656
 657        desc = knav_pool_desc_unmap(netcp->rx_pool, dma_desc, dma_sz);
 658        if (unlikely(!desc)) {
 659                dev_err(netcp->ndev_dev, "failed to unmap Rx desc\n");
 660                return 0;
 661        }
 662
 663        get_pkt_info(&dma_buff, &buf_len, &dma_desc, desc);
 664        /* warning!!!! We are retrieving the virtual ptr in the sw_data
 665         * field as a 32bit value. Will not work on 64bit machines
 666         */
 667        org_buf_ptr = (void *)GET_SW_DATA0(desc);
 668        org_buf_len = (int)GET_SW_DATA1(desc);
 669
 670        if (unlikely(!org_buf_ptr)) {
 671                dev_err(netcp->ndev_dev, "NULL bufptr in desc\n");
 672                goto free_desc;
 673        }
 674
 675        pkt_sz &= KNAV_DMA_DESC_PKT_LEN_MASK;
 676        accum_sz = buf_len;
 677        dma_unmap_single(netcp->dev, dma_buff, buf_len, DMA_FROM_DEVICE);
 678
 679        /* Build a new sk_buff for the primary buffer */
 680        skb = build_skb(org_buf_ptr, org_buf_len);
 681        if (unlikely(!skb)) {
 682                dev_err(netcp->ndev_dev, "build_skb() failed\n");
 683                goto free_desc;
 684        }
 685
 686        /* update data, tail and len */
 687        skb_reserve(skb, NETCP_SOP_OFFSET);
 688        __skb_put(skb, buf_len);
 689
 690        /* Fill in the page fragment list */
 691        while (dma_desc) {
 692                struct page *page;
 693
 694                ndesc = knav_pool_desc_unmap(netcp->rx_pool, dma_desc, dma_sz);
 695                if (unlikely(!ndesc)) {
 696                        dev_err(netcp->ndev_dev, "failed to unmap Rx desc\n");
 697                        goto free_desc;
 698                }
 699
 700                get_pkt_info(&dma_buff, &buf_len, &dma_desc, ndesc);
 701                /* warning!!!! We are retrieving the virtual ptr in the sw_data
 702                 * field as a 32bit value. Will not work on 64bit machines
 703                 */
 704                page = (struct page *)GET_SW_DATA0(ndesc);
 705
 706                if (likely(dma_buff && buf_len && page)) {
 707                        dma_unmap_page(netcp->dev, dma_buff, PAGE_SIZE,
 708                                       DMA_FROM_DEVICE);
 709                } else {
 710                        dev_err(netcp->ndev_dev, "Bad Rx desc dma_buff(%pad), len(%d), page(%p)\n",
 711                                &dma_buff, buf_len, page);
 712                        goto free_desc;
 713                }
 714
 715                skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page,
 716                                offset_in_page(dma_buff), buf_len, PAGE_SIZE);
 717                accum_sz += buf_len;
 718
 719                /* Free the descriptor */
 720                knav_pool_desc_put(netcp->rx_pool, ndesc);
 721        }
 722
 723        /* check for packet len and warn */
 724        if (unlikely(pkt_sz != accum_sz))
 725                dev_dbg(netcp->ndev_dev, "mismatch in packet size(%d) & sum of fragments(%d)\n",
 726                        pkt_sz, accum_sz);
 727
 728        /* Newer version of the Ethernet switch can trim the Ethernet FCS
 729         * from the packet and is indicated in hw_cap. So trim it only for
 730         * older h/w
 731         */
 732        if (!(netcp->hw_cap & ETH_SW_CAN_REMOVE_ETH_FCS))
 733                __pskb_trim(skb, skb->len - ETH_FCS_LEN);
 734
 735        /* Call each of the RX hooks */
 736        p_info.skb = skb;
 737        skb->dev = netcp->ndev;
 738        p_info.rxtstamp_complete = false;
 739        get_desc_info(&tmp, &p_info.eflags, desc);
 740        p_info.epib = desc->epib;
 741        p_info.psdata = (u32 __force *)desc->psdata;
 742        p_info.eflags = ((p_info.eflags >> KNAV_DMA_DESC_EFLAGS_SHIFT) &
 743                         KNAV_DMA_DESC_EFLAGS_MASK);
 744        list_for_each_entry(rx_hook, &netcp->rxhook_list_head, list) {
 745                int ret;
 746
 747                ret = rx_hook->hook_rtn(rx_hook->order, rx_hook->hook_data,
 748                                        &p_info);
 749                if (unlikely(ret)) {
 750                        dev_err(netcp->ndev_dev, "RX hook %d failed: %d\n",
 751                                rx_hook->order, ret);
 752                        /* Free the primary descriptor */
 753                        rx_stats->rx_dropped++;
 754                        knav_pool_desc_put(netcp->rx_pool, desc);
 755                        dev_kfree_skb(skb);
 756                        return 0;
 757                }
 758        }
 759        /* Free the primary descriptor */
 760        knav_pool_desc_put(netcp->rx_pool, desc);
 761
 762        u64_stats_update_begin(&rx_stats->syncp_rx);
 763        rx_stats->rx_packets++;
 764        rx_stats->rx_bytes += skb->len;
 765        u64_stats_update_end(&rx_stats->syncp_rx);
 766
 767        /* push skb up the stack */
 768        skb->protocol = eth_type_trans(skb, netcp->ndev);
 769        netif_receive_skb(skb);
 770        return 0;
 771
 772free_desc:
 773        netcp_free_rx_desc_chain(netcp, desc);
 774        rx_stats->rx_errors++;
 775        return 0;
 776}
 777
 778static int netcp_process_rx_packets(struct netcp_intf *netcp,
 779                                    unsigned int budget)
 780{
 781        int i;
 782
 783        for (i = 0; (i < budget) && !netcp_process_one_rx_packet(netcp); i++)
 784                ;
 785        return i;
 786}
 787
 788/* Release descriptors and attached buffers from Rx FDQ */
 789static void netcp_free_rx_buf(struct netcp_intf *netcp, int fdq)
 790{
 791        struct knav_dma_desc *desc;
 792        unsigned int buf_len, dma_sz;
 793        dma_addr_t dma;
 794        void *buf_ptr;
 795
 796        /* Allocate descriptor */
 797        while ((dma = knav_queue_pop(netcp->rx_fdq[fdq], &dma_sz))) {
 798                desc = knav_pool_desc_unmap(netcp->rx_pool, dma, dma_sz);
 799                if (unlikely(!desc)) {
 800                        dev_err(netcp->ndev_dev, "failed to unmap Rx desc\n");
 801                        continue;
 802                }
 803
 804                get_org_pkt_info(&dma, &buf_len, desc);
 805                /* warning!!!! We are retrieving the virtual ptr in the sw_data
 806                 * field as a 32bit value. Will not work on 64bit machines
 807                 */
 808                buf_ptr = (void *)GET_SW_DATA0(desc);
 809
 810                if (unlikely(!dma)) {
 811                        dev_err(netcp->ndev_dev, "NULL orig_buff in desc\n");
 812                        knav_pool_desc_put(netcp->rx_pool, desc);
 813                        continue;
 814                }
 815
 816                if (unlikely(!buf_ptr)) {
 817                        dev_err(netcp->ndev_dev, "NULL bufptr in desc\n");
 818                        knav_pool_desc_put(netcp->rx_pool, desc);
 819                        continue;
 820                }
 821
 822                if (fdq == 0) {
 823                        dma_unmap_single(netcp->dev, dma, buf_len,
 824                                         DMA_FROM_DEVICE);
 825                        netcp_frag_free((buf_len <= PAGE_SIZE), buf_ptr);
 826                } else {
 827                        dma_unmap_page(netcp->dev, dma, buf_len,
 828                                       DMA_FROM_DEVICE);
 829                        __free_page(buf_ptr);
 830                }
 831
 832                knav_pool_desc_put(netcp->rx_pool, desc);
 833        }
 834}
 835
 836static void netcp_rxpool_free(struct netcp_intf *netcp)
 837{
 838        int i;
 839
 840        for (i = 0; i < KNAV_DMA_FDQ_PER_CHAN &&
 841             !IS_ERR_OR_NULL(netcp->rx_fdq[i]); i++)
 842                netcp_free_rx_buf(netcp, i);
 843
 844        if (knav_pool_count(netcp->rx_pool) != netcp->rx_pool_size)
 845                dev_err(netcp->ndev_dev, "Lost Rx (%d) descriptors\n",
 846                        netcp->rx_pool_size - knav_pool_count(netcp->rx_pool));
 847
 848        knav_pool_destroy(netcp->rx_pool);
 849        netcp->rx_pool = NULL;
 850}
 851
 852static int netcp_allocate_rx_buf(struct netcp_intf *netcp, int fdq)
 853{
 854        struct knav_dma_desc *hwdesc;
 855        unsigned int buf_len, dma_sz;
 856        u32 desc_info, pkt_info;
 857        struct page *page;
 858        dma_addr_t dma;
 859        void *bufptr;
 860        u32 sw_data[2];
 861
 862        /* Allocate descriptor */
 863        hwdesc = knav_pool_desc_get(netcp->rx_pool);
 864        if (IS_ERR_OR_NULL(hwdesc)) {
 865                dev_dbg(netcp->ndev_dev, "out of rx pool desc\n");
 866                return -ENOMEM;
 867        }
 868
 869        if (likely(fdq == 0)) {
 870                unsigned int primary_buf_len;
 871                /* Allocate a primary receive queue entry */
 872                buf_len = NETCP_PACKET_SIZE + NETCP_SOP_OFFSET;
 873                primary_buf_len = SKB_DATA_ALIGN(buf_len) +
 874                                SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
 875
 876                bufptr = netdev_alloc_frag(primary_buf_len);
 877                sw_data[1] = primary_buf_len;
 878
 879                if (unlikely(!bufptr)) {
 880                        dev_warn_ratelimited(netcp->ndev_dev,
 881                                             "Primary RX buffer alloc failed\n");
 882                        goto fail;
 883                }
 884                dma = dma_map_single(netcp->dev, bufptr, buf_len,
 885                                     DMA_TO_DEVICE);
 886                if (unlikely(dma_mapping_error(netcp->dev, dma)))
 887                        goto fail;
 888
 889                /* warning!!!! We are saving the virtual ptr in the sw_data
 890                 * field as a 32bit value. Will not work on 64bit machines
 891                 */
 892                sw_data[0] = (u32)bufptr;
 893        } else {
 894                /* Allocate a secondary receive queue entry */
 895                page = alloc_page(GFP_ATOMIC | GFP_DMA);
 896                if (unlikely(!page)) {
 897                        dev_warn_ratelimited(netcp->ndev_dev, "Secondary page alloc failed\n");
 898                        goto fail;
 899                }
 900                buf_len = PAGE_SIZE;
 901                dma = dma_map_page(netcp->dev, page, 0, buf_len, DMA_TO_DEVICE);
 902                /* warning!!!! We are saving the virtual ptr in the sw_data
 903                 * field as a 32bit value. Will not work on 64bit machines
 904                 */
 905                sw_data[0] = (u32)page;
 906                sw_data[1] = 0;
 907        }
 908
 909        desc_info =  KNAV_DMA_DESC_PS_INFO_IN_DESC;
 910        desc_info |= buf_len & KNAV_DMA_DESC_PKT_LEN_MASK;
 911        pkt_info =  KNAV_DMA_DESC_HAS_EPIB;
 912        pkt_info |= KNAV_DMA_NUM_PS_WORDS << KNAV_DMA_DESC_PSLEN_SHIFT;
 913        pkt_info |= (netcp->rx_queue_id & KNAV_DMA_DESC_RETQ_MASK) <<
 914                    KNAV_DMA_DESC_RETQ_SHIFT;
 915        set_org_pkt_info(dma, buf_len, hwdesc);
 916        SET_SW_DATA0(sw_data[0], hwdesc);
 917        SET_SW_DATA1(sw_data[1], hwdesc);
 918        set_desc_info(desc_info, pkt_info, hwdesc);
 919
 920        /* Push to FDQs */
 921        knav_pool_desc_map(netcp->rx_pool, hwdesc, sizeof(*hwdesc), &dma,
 922                           &dma_sz);
 923        knav_queue_push(netcp->rx_fdq[fdq], dma, sizeof(*hwdesc), 0);
 924        return 0;
 925
 926fail:
 927        knav_pool_desc_put(netcp->rx_pool, hwdesc);
 928        return -ENOMEM;
 929}
 930
 931/* Refill Rx FDQ with descriptors & attached buffers */
 932static void netcp_rxpool_refill(struct netcp_intf *netcp)
 933{
 934        u32 fdq_deficit[KNAV_DMA_FDQ_PER_CHAN] = {0};
 935        int i, ret = 0;
 936
 937        /* Calculate the FDQ deficit and refill */
 938        for (i = 0; i < KNAV_DMA_FDQ_PER_CHAN && netcp->rx_fdq[i]; i++) {
 939                fdq_deficit[i] = netcp->rx_queue_depths[i] -
 940                                 knav_queue_get_count(netcp->rx_fdq[i]);
 941
 942                while (fdq_deficit[i]-- && !ret)
 943                        ret = netcp_allocate_rx_buf(netcp, i);
 944        } /* end for fdqs */
 945}
 946
 947/* NAPI poll */
 948static int netcp_rx_poll(struct napi_struct *napi, int budget)
 949{
 950        struct netcp_intf *netcp = container_of(napi, struct netcp_intf,
 951                                                rx_napi);
 952        unsigned int packets;
 953
 954        packets = netcp_process_rx_packets(netcp, budget);
 955
 956        netcp_rxpool_refill(netcp);
 957        if (packets < budget) {
 958                napi_complete_done(&netcp->rx_napi, packets);
 959                knav_queue_enable_notify(netcp->rx_queue);
 960        }
 961
 962        return packets;
 963}
 964
 965static void netcp_rx_notify(void *arg)
 966{
 967        struct netcp_intf *netcp = arg;
 968
 969        knav_queue_disable_notify(netcp->rx_queue);
 970        napi_schedule(&netcp->rx_napi);
 971}
 972
 973static void netcp_free_tx_desc_chain(struct netcp_intf *netcp,
 974                                     struct knav_dma_desc *desc,
 975                                     unsigned int desc_sz)
 976{
 977        struct knav_dma_desc *ndesc = desc;
 978        dma_addr_t dma_desc, dma_buf;
 979        unsigned int buf_len;
 980
 981        while (ndesc) {
 982                get_pkt_info(&dma_buf, &buf_len, &dma_desc, ndesc);
 983
 984                if (dma_buf && buf_len)
 985                        dma_unmap_single(netcp->dev, dma_buf, buf_len,
 986                                         DMA_TO_DEVICE);
 987                else
 988                        dev_warn(netcp->ndev_dev, "bad Tx desc buf(%pad), len(%d)\n",
 989                                 &dma_buf, buf_len);
 990
 991                knav_pool_desc_put(netcp->tx_pool, ndesc);
 992                ndesc = NULL;
 993                if (dma_desc) {
 994                        ndesc = knav_pool_desc_unmap(netcp->tx_pool, dma_desc,
 995                                                     desc_sz);
 996                        if (!ndesc)
 997                                dev_err(netcp->ndev_dev, "failed to unmap Tx desc\n");
 998                }
 999        }
1000}
1001
1002static int netcp_process_tx_compl_packets(struct netcp_intf *netcp,
1003                                          unsigned int budget)
1004{
1005        struct netcp_stats *tx_stats = &netcp->stats;
1006        struct knav_dma_desc *desc;
1007        struct netcp_tx_cb *tx_cb;
1008        struct sk_buff *skb;
1009        unsigned int dma_sz;
1010        dma_addr_t dma;
1011        int pkts = 0;
1012
1013        while (budget--) {
1014                dma = knav_queue_pop(netcp->tx_compl_q, &dma_sz);
1015                if (!dma)
1016                        break;
1017                desc = knav_pool_desc_unmap(netcp->tx_pool, dma, dma_sz);
1018                if (unlikely(!desc)) {
1019                        dev_err(netcp->ndev_dev, "failed to unmap Tx desc\n");
1020                        tx_stats->tx_errors++;
1021                        continue;
1022                }
1023
1024                /* warning!!!! We are retrieving the virtual ptr in the sw_data
1025                 * field as a 32bit value. Will not work on 64bit machines
1026                 */
1027                skb = (struct sk_buff *)GET_SW_DATA0(desc);
1028                netcp_free_tx_desc_chain(netcp, desc, dma_sz);
1029                if (!skb) {
1030                        dev_err(netcp->ndev_dev, "No skb in Tx desc\n");
1031                        tx_stats->tx_errors++;
1032                        continue;
1033                }
1034
1035                tx_cb = (struct netcp_tx_cb *)skb->cb;
1036                if (tx_cb->txtstamp)
1037                        tx_cb->txtstamp(tx_cb->ts_context, skb);
1038
1039                if (netif_subqueue_stopped(netcp->ndev, skb) &&
1040                    netif_running(netcp->ndev) &&
1041                    (knav_pool_count(netcp->tx_pool) >
1042                    netcp->tx_resume_threshold)) {
1043                        u16 subqueue = skb_get_queue_mapping(skb);
1044
1045                        netif_wake_subqueue(netcp->ndev, subqueue);
1046                }
1047
1048                u64_stats_update_begin(&tx_stats->syncp_tx);
1049                tx_stats->tx_packets++;
1050                tx_stats->tx_bytes += skb->len;
1051                u64_stats_update_end(&tx_stats->syncp_tx);
1052                dev_kfree_skb(skb);
1053                pkts++;
1054        }
1055        return pkts;
1056}
1057
1058static int netcp_tx_poll(struct napi_struct *napi, int budget)
1059{
1060        int packets;
1061        struct netcp_intf *netcp = container_of(napi, struct netcp_intf,
1062                                                tx_napi);
1063
1064        packets = netcp_process_tx_compl_packets(netcp, budget);
1065        if (packets < budget) {
1066                napi_complete(&netcp->tx_napi);
1067                knav_queue_enable_notify(netcp->tx_compl_q);
1068        }
1069
1070        return packets;
1071}
1072
1073static void netcp_tx_notify(void *arg)
1074{
1075        struct netcp_intf *netcp = arg;
1076
1077        knav_queue_disable_notify(netcp->tx_compl_q);
1078        napi_schedule(&netcp->tx_napi);
1079}
1080
1081static struct knav_dma_desc*
1082netcp_tx_map_skb(struct sk_buff *skb, struct netcp_intf *netcp)
1083{
1084        struct knav_dma_desc *desc, *ndesc, *pdesc;
1085        unsigned int pkt_len = skb_headlen(skb);
1086        struct device *dev = netcp->dev;
1087        dma_addr_t dma_addr;
1088        unsigned int dma_sz;
1089        int i;
1090
1091        /* Map the linear buffer */
1092        dma_addr = dma_map_single(dev, skb->data, pkt_len, DMA_TO_DEVICE);
1093        if (unlikely(dma_mapping_error(dev, dma_addr))) {
1094                dev_err(netcp->ndev_dev, "Failed to map skb buffer\n");
1095                return NULL;
1096        }
1097
1098        desc = knav_pool_desc_get(netcp->tx_pool);
1099        if (IS_ERR_OR_NULL(desc)) {
1100                dev_err(netcp->ndev_dev, "out of TX desc\n");
1101                dma_unmap_single(dev, dma_addr, pkt_len, DMA_TO_DEVICE);
1102                return NULL;
1103        }
1104
1105        set_pkt_info(dma_addr, pkt_len, 0, desc);
1106        if (skb_is_nonlinear(skb)) {
1107                prefetchw(skb_shinfo(skb));
1108        } else {
1109                desc->next_desc = 0;
1110                goto upd_pkt_len;
1111        }
1112
1113        pdesc = desc;
1114
1115        /* Handle the case where skb is fragmented in pages */
1116        for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1117                skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1118                struct page *page = skb_frag_page(frag);
1119                u32 page_offset = skb_frag_off(frag);
1120                u32 buf_len = skb_frag_size(frag);
1121                dma_addr_t desc_dma;
1122                u32 desc_dma_32;
1123
1124                dma_addr = dma_map_page(dev, page, page_offset, buf_len,
1125                                        DMA_TO_DEVICE);
1126                if (unlikely(!dma_addr)) {
1127                        dev_err(netcp->ndev_dev, "Failed to map skb page\n");
1128                        goto free_descs;
1129                }
1130
1131                ndesc = knav_pool_desc_get(netcp->tx_pool);
1132                if (IS_ERR_OR_NULL(ndesc)) {
1133                        dev_err(netcp->ndev_dev, "out of TX desc for frags\n");
1134                        dma_unmap_page(dev, dma_addr, buf_len, DMA_TO_DEVICE);
1135                        goto free_descs;
1136                }
1137
1138                desc_dma = knav_pool_desc_virt_to_dma(netcp->tx_pool, ndesc);
1139                set_pkt_info(dma_addr, buf_len, 0, ndesc);
1140                desc_dma_32 = (u32)desc_dma;
1141                set_words(&desc_dma_32, 1, &pdesc->next_desc);
1142                pkt_len += buf_len;
1143                if (pdesc != desc)
1144                        knav_pool_desc_map(netcp->tx_pool, pdesc,
1145                                           sizeof(*pdesc), &desc_dma, &dma_sz);
1146                pdesc = ndesc;
1147        }
1148        if (pdesc != desc)
1149                knav_pool_desc_map(netcp->tx_pool, pdesc, sizeof(*pdesc),
1150                                   &dma_addr, &dma_sz);
1151
1152        /* frag list based linkage is not supported for now. */
1153        if (skb_shinfo(skb)->frag_list) {
1154                dev_err_ratelimited(netcp->ndev_dev, "NETIF_F_FRAGLIST not supported\n");
1155                goto free_descs;
1156        }
1157
1158upd_pkt_len:
1159        WARN_ON(pkt_len != skb->len);
1160
1161        pkt_len &= KNAV_DMA_DESC_PKT_LEN_MASK;
1162        set_words(&pkt_len, 1, &desc->desc_info);
1163        return desc;
1164
1165free_descs:
1166        netcp_free_tx_desc_chain(netcp, desc, sizeof(*desc));
1167        return NULL;
1168}
1169
1170static int netcp_tx_submit_skb(struct netcp_intf *netcp,
1171                               struct sk_buff *skb,
1172                               struct knav_dma_desc *desc)
1173{
1174        struct netcp_tx_pipe *tx_pipe = NULL;
1175        struct netcp_hook_list *tx_hook;
1176        struct netcp_packet p_info;
1177        struct netcp_tx_cb *tx_cb;
1178        unsigned int dma_sz;
1179        dma_addr_t dma;
1180        u32 tmp = 0;
1181        int ret = 0;
1182
1183        p_info.netcp = netcp;
1184        p_info.skb = skb;
1185        p_info.tx_pipe = NULL;
1186        p_info.psdata_len = 0;
1187        p_info.ts_context = NULL;
1188        p_info.txtstamp = NULL;
1189        p_info.epib = desc->epib;
1190        p_info.psdata = (u32 __force *)desc->psdata;
1191        memset(p_info.epib, 0, KNAV_DMA_NUM_EPIB_WORDS * sizeof(__le32));
1192
1193        /* Find out where to inject the packet for transmission */
1194        list_for_each_entry(tx_hook, &netcp->txhook_list_head, list) {
1195                ret = tx_hook->hook_rtn(tx_hook->order, tx_hook->hook_data,
1196                                        &p_info);
1197                if (unlikely(ret != 0)) {
1198                        dev_err(netcp->ndev_dev, "TX hook %d rejected the packet with reason(%d)\n",
1199                                tx_hook->order, ret);
1200                        ret = (ret < 0) ? ret : NETDEV_TX_OK;
1201                        goto out;
1202                }
1203        }
1204
1205        /* Make sure some TX hook claimed the packet */
1206        tx_pipe = p_info.tx_pipe;
1207        if (!tx_pipe) {
1208                dev_err(netcp->ndev_dev, "No TX hook claimed the packet!\n");
1209                ret = -ENXIO;
1210                goto out;
1211        }
1212
1213        tx_cb = (struct netcp_tx_cb *)skb->cb;
1214        tx_cb->ts_context = p_info.ts_context;
1215        tx_cb->txtstamp = p_info.txtstamp;
1216
1217        /* update descriptor */
1218        if (p_info.psdata_len) {
1219                /* psdata points to both native-endian and device-endian data */
1220                __le32 *psdata = (void __force *)p_info.psdata;
1221
1222                set_words((u32 *)psdata +
1223                          (KNAV_DMA_NUM_PS_WORDS - p_info.psdata_len),
1224                          p_info.psdata_len, psdata);
1225                tmp |= (p_info.psdata_len & KNAV_DMA_DESC_PSLEN_MASK) <<
1226                        KNAV_DMA_DESC_PSLEN_SHIFT;
1227        }
1228
1229        tmp |= KNAV_DMA_DESC_HAS_EPIB |
1230                ((netcp->tx_compl_qid & KNAV_DMA_DESC_RETQ_MASK) <<
1231                KNAV_DMA_DESC_RETQ_SHIFT);
1232
1233        if (!(tx_pipe->flags & SWITCH_TO_PORT_IN_TAGINFO)) {
1234                tmp |= ((tx_pipe->switch_to_port & KNAV_DMA_DESC_PSFLAG_MASK) <<
1235                        KNAV_DMA_DESC_PSFLAG_SHIFT);
1236        }
1237
1238        set_words(&tmp, 1, &desc->packet_info);
1239        /* warning!!!! We are saving the virtual ptr in the sw_data
1240         * field as a 32bit value. Will not work on 64bit machines
1241         */
1242        SET_SW_DATA0((u32)skb, desc);
1243
1244        if (tx_pipe->flags & SWITCH_TO_PORT_IN_TAGINFO) {
1245                tmp = tx_pipe->switch_to_port;
1246                set_words(&tmp, 1, &desc->tag_info);
1247        }
1248
1249        /* submit packet descriptor */
1250        ret = knav_pool_desc_map(netcp->tx_pool, desc, sizeof(*desc), &dma,
1251                                 &dma_sz);
1252        if (unlikely(ret)) {
1253                dev_err(netcp->ndev_dev, "%s() failed to map desc\n", __func__);
1254                ret = -ENOMEM;
1255                goto out;
1256        }
1257        skb_tx_timestamp(skb);
1258        knav_queue_push(tx_pipe->dma_queue, dma, dma_sz, 0);
1259
1260out:
1261        return ret;
1262}
1263
1264/* Submit the packet */
1265static int netcp_ndo_start_xmit(struct sk_buff *skb, struct net_device *ndev)
1266{
1267        struct netcp_intf *netcp = netdev_priv(ndev);
1268        struct netcp_stats *tx_stats = &netcp->stats;
1269        int subqueue = skb_get_queue_mapping(skb);
1270        struct knav_dma_desc *desc;
1271        int desc_count, ret = 0;
1272
1273        if (unlikely(skb->len <= 0)) {
1274                dev_kfree_skb(skb);
1275                return NETDEV_TX_OK;
1276        }
1277
1278        if (unlikely(skb->len < NETCP_MIN_PACKET_SIZE)) {
1279                ret = skb_padto(skb, NETCP_MIN_PACKET_SIZE);
1280                if (ret < 0) {
1281                        /* If we get here, the skb has already been dropped */
1282                        dev_warn(netcp->ndev_dev, "padding failed (%d), packet dropped\n",
1283                                 ret);
1284                        tx_stats->tx_dropped++;
1285                        return ret;
1286                }
1287                skb->len = NETCP_MIN_PACKET_SIZE;
1288        }
1289
1290        desc = netcp_tx_map_skb(skb, netcp);
1291        if (unlikely(!desc)) {
1292                netif_stop_subqueue(ndev, subqueue);
1293                ret = -ENOBUFS;
1294                goto drop;
1295        }
1296
1297        ret = netcp_tx_submit_skb(netcp, skb, desc);
1298        if (ret)
1299                goto drop;
1300
1301        /* Check Tx pool count & stop subqueue if needed */
1302        desc_count = knav_pool_count(netcp->tx_pool);
1303        if (desc_count < netcp->tx_pause_threshold) {
1304                dev_dbg(netcp->ndev_dev, "pausing tx, count(%d)\n", desc_count);
1305                netif_stop_subqueue(ndev, subqueue);
1306        }
1307        return NETDEV_TX_OK;
1308
1309drop:
1310        tx_stats->tx_dropped++;
1311        if (desc)
1312                netcp_free_tx_desc_chain(netcp, desc, sizeof(*desc));
1313        dev_kfree_skb(skb);
1314        return ret;
1315}
1316
1317int netcp_txpipe_close(struct netcp_tx_pipe *tx_pipe)
1318{
1319        if (tx_pipe->dma_channel) {
1320                knav_dma_close_channel(tx_pipe->dma_channel);
1321                tx_pipe->dma_channel = NULL;
1322        }
1323        return 0;
1324}
1325EXPORT_SYMBOL_GPL(netcp_txpipe_close);
1326
1327int netcp_txpipe_open(struct netcp_tx_pipe *tx_pipe)
1328{
1329        struct device *dev = tx_pipe->netcp_device->device;
1330        struct knav_dma_cfg config;
1331        int ret = 0;
1332        u8 name[16];
1333
1334        memset(&config, 0, sizeof(config));
1335        config.direction = DMA_MEM_TO_DEV;
1336        config.u.tx.filt_einfo = false;
1337        config.u.tx.filt_pswords = false;
1338        config.u.tx.priority = DMA_PRIO_MED_L;
1339
1340        tx_pipe->dma_channel = knav_dma_open_channel(dev,
1341                                tx_pipe->dma_chan_name, &config);
1342        if (IS_ERR(tx_pipe->dma_channel)) {
1343                dev_err(dev, "failed opening tx chan(%s)\n",
1344                        tx_pipe->dma_chan_name);
1345                ret = PTR_ERR(tx_pipe->dma_channel);
1346                goto err;
1347        }
1348
1349        snprintf(name, sizeof(name), "tx-pipe-%s", dev_name(dev));
1350        tx_pipe->dma_queue = knav_queue_open(name, tx_pipe->dma_queue_id,
1351                                             KNAV_QUEUE_SHARED);
1352        if (IS_ERR(tx_pipe->dma_queue)) {
1353                dev_err(dev, "Could not open DMA queue for channel \"%s\": %pe\n",
1354                        name, tx_pipe->dma_queue);
1355                ret = PTR_ERR(tx_pipe->dma_queue);
1356                goto err;
1357        }
1358
1359        dev_dbg(dev, "opened tx pipe %s\n", name);
1360        return 0;
1361
1362err:
1363        if (!IS_ERR_OR_NULL(tx_pipe->dma_channel))
1364                knav_dma_close_channel(tx_pipe->dma_channel);
1365        tx_pipe->dma_channel = NULL;
1366        return ret;
1367}
1368EXPORT_SYMBOL_GPL(netcp_txpipe_open);
1369
1370int netcp_txpipe_init(struct netcp_tx_pipe *tx_pipe,
1371                      struct netcp_device *netcp_device,
1372                      const char *dma_chan_name, unsigned int dma_queue_id)
1373{
1374        memset(tx_pipe, 0, sizeof(*tx_pipe));
1375        tx_pipe->netcp_device = netcp_device;
1376        tx_pipe->dma_chan_name = dma_chan_name;
1377        tx_pipe->dma_queue_id = dma_queue_id;
1378        return 0;
1379}
1380EXPORT_SYMBOL_GPL(netcp_txpipe_init);
1381
1382static struct netcp_addr *netcp_addr_find(struct netcp_intf *netcp,
1383                                          const u8 *addr,
1384                                          enum netcp_addr_type type)
1385{
1386        struct netcp_addr *naddr;
1387
1388        list_for_each_entry(naddr, &netcp->addr_list, node) {
1389                if (naddr->type != type)
1390                        continue;
1391                if (addr && memcmp(addr, naddr->addr, ETH_ALEN))
1392                        continue;
1393                return naddr;
1394        }
1395
1396        return NULL;
1397}
1398
1399static struct netcp_addr *netcp_addr_add(struct netcp_intf *netcp,
1400                                         const u8 *addr,
1401                                         enum netcp_addr_type type)
1402{
1403        struct netcp_addr *naddr;
1404
1405        naddr = devm_kmalloc(netcp->dev, sizeof(*naddr), GFP_ATOMIC);
1406        if (!naddr)
1407                return NULL;
1408
1409        naddr->type = type;
1410        naddr->flags = 0;
1411        naddr->netcp = netcp;
1412        if (addr)
1413                ether_addr_copy(naddr->addr, addr);
1414        else
1415                eth_zero_addr(naddr->addr);
1416        list_add_tail(&naddr->node, &netcp->addr_list);
1417
1418        return naddr;
1419}
1420
1421static void netcp_addr_del(struct netcp_intf *netcp, struct netcp_addr *naddr)
1422{
1423        list_del(&naddr->node);
1424        devm_kfree(netcp->dev, naddr);
1425}
1426
1427static void netcp_addr_clear_mark(struct netcp_intf *netcp)
1428{
1429        struct netcp_addr *naddr;
1430
1431        list_for_each_entry(naddr, &netcp->addr_list, node)
1432                naddr->flags = 0;
1433}
1434
1435static void netcp_addr_add_mark(struct netcp_intf *netcp, const u8 *addr,
1436                                enum netcp_addr_type type)
1437{
1438        struct netcp_addr *naddr;
1439
1440        naddr = netcp_addr_find(netcp, addr, type);
1441        if (naddr) {
1442                naddr->flags |= ADDR_VALID;
1443                return;
1444        }
1445
1446        naddr = netcp_addr_add(netcp, addr, type);
1447        if (!WARN_ON(!naddr))
1448                naddr->flags |= ADDR_NEW;
1449}
1450
1451static void netcp_addr_sweep_del(struct netcp_intf *netcp)
1452{
1453        struct netcp_addr *naddr, *tmp;
1454        struct netcp_intf_modpriv *priv;
1455        struct netcp_module *module;
1456        int error;
1457
1458        list_for_each_entry_safe(naddr, tmp, &netcp->addr_list, node) {
1459                if (naddr->flags & (ADDR_VALID | ADDR_NEW))
1460                        continue;
1461                dev_dbg(netcp->ndev_dev, "deleting address %pM, type %x\n",
1462                        naddr->addr, naddr->type);
1463                for_each_module(netcp, priv) {
1464                        module = priv->netcp_module;
1465                        if (!module->del_addr)
1466                                continue;
1467                        error = module->del_addr(priv->module_priv,
1468                                                 naddr);
1469                        WARN_ON(error);
1470                }
1471                netcp_addr_del(netcp, naddr);
1472        }
1473}
1474
1475static void netcp_addr_sweep_add(struct netcp_intf *netcp)
1476{
1477        struct netcp_addr *naddr, *tmp;
1478        struct netcp_intf_modpriv *priv;
1479        struct netcp_module *module;
1480        int error;
1481
1482        list_for_each_entry_safe(naddr, tmp, &netcp->addr_list, node) {
1483                if (!(naddr->flags & ADDR_NEW))
1484                        continue;
1485                dev_dbg(netcp->ndev_dev, "adding address %pM, type %x\n",
1486                        naddr->addr, naddr->type);
1487
1488                for_each_module(netcp, priv) {
1489                        module = priv->netcp_module;
1490                        if (!module->add_addr)
1491                                continue;
1492                        error = module->add_addr(priv->module_priv, naddr);
1493                        WARN_ON(error);
1494                }
1495        }
1496}
1497
1498static int netcp_set_promiscuous(struct netcp_intf *netcp, bool promisc)
1499{
1500        struct netcp_intf_modpriv *priv;
1501        struct netcp_module *module;
1502        int error;
1503
1504        for_each_module(netcp, priv) {
1505                module = priv->netcp_module;
1506                if (!module->set_rx_mode)
1507                        continue;
1508
1509                error = module->set_rx_mode(priv->module_priv, promisc);
1510                if (error)
1511                        return error;
1512        }
1513        return 0;
1514}
1515
1516static void netcp_set_rx_mode(struct net_device *ndev)
1517{
1518        struct netcp_intf *netcp = netdev_priv(ndev);
1519        struct netdev_hw_addr *ndev_addr;
1520        bool promisc;
1521
1522        promisc = (ndev->flags & IFF_PROMISC ||
1523                   ndev->flags & IFF_ALLMULTI ||
1524                   netdev_mc_count(ndev) > NETCP_MAX_MCAST_ADDR);
1525
1526        spin_lock(&netcp->lock);
1527        /* first clear all marks */
1528        netcp_addr_clear_mark(netcp);
1529
1530        /* next add new entries, mark existing ones */
1531        netcp_addr_add_mark(netcp, ndev->broadcast, ADDR_BCAST);
1532        for_each_dev_addr(ndev, ndev_addr)
1533                netcp_addr_add_mark(netcp, ndev_addr->addr, ADDR_DEV);
1534        netdev_for_each_uc_addr(ndev_addr, ndev)
1535                netcp_addr_add_mark(netcp, ndev_addr->addr, ADDR_UCAST);
1536        netdev_for_each_mc_addr(ndev_addr, ndev)
1537                netcp_addr_add_mark(netcp, ndev_addr->addr, ADDR_MCAST);
1538
1539        if (promisc)
1540                netcp_addr_add_mark(netcp, NULL, ADDR_ANY);
1541
1542        /* finally sweep and callout into modules */
1543        netcp_addr_sweep_del(netcp);
1544        netcp_addr_sweep_add(netcp);
1545        netcp_set_promiscuous(netcp, promisc);
1546        spin_unlock(&netcp->lock);
1547}
1548
1549static void netcp_free_navigator_resources(struct netcp_intf *netcp)
1550{
1551        int i;
1552
1553        if (netcp->rx_channel) {
1554                knav_dma_close_channel(netcp->rx_channel);
1555                netcp->rx_channel = NULL;
1556        }
1557
1558        if (!IS_ERR_OR_NULL(netcp->rx_pool))
1559                netcp_rxpool_free(netcp);
1560
1561        if (!IS_ERR_OR_NULL(netcp->rx_queue)) {
1562                knav_queue_close(netcp->rx_queue);
1563                netcp->rx_queue = NULL;
1564        }
1565
1566        for (i = 0; i < KNAV_DMA_FDQ_PER_CHAN &&
1567             !IS_ERR_OR_NULL(netcp->rx_fdq[i]) ; ++i) {
1568                knav_queue_close(netcp->rx_fdq[i]);
1569                netcp->rx_fdq[i] = NULL;
1570        }
1571
1572        if (!IS_ERR_OR_NULL(netcp->tx_compl_q)) {
1573                knav_queue_close(netcp->tx_compl_q);
1574                netcp->tx_compl_q = NULL;
1575        }
1576
1577        if (!IS_ERR_OR_NULL(netcp->tx_pool)) {
1578                knav_pool_destroy(netcp->tx_pool);
1579                netcp->tx_pool = NULL;
1580        }
1581}
1582
1583static int netcp_setup_navigator_resources(struct net_device *ndev)
1584{
1585        struct netcp_intf *netcp = netdev_priv(ndev);
1586        struct knav_queue_notify_config notify_cfg;
1587        struct knav_dma_cfg config;
1588        u32 last_fdq = 0;
1589        u8 name[16];
1590        int ret;
1591        int i;
1592
1593        /* Create Rx/Tx descriptor pools */
1594        snprintf(name, sizeof(name), "rx-pool-%s", ndev->name);
1595        netcp->rx_pool = knav_pool_create(name, netcp->rx_pool_size,
1596                                                netcp->rx_pool_region_id);
1597        if (IS_ERR_OR_NULL(netcp->rx_pool)) {
1598                dev_err(netcp->ndev_dev, "Couldn't create rx pool\n");
1599                ret = PTR_ERR(netcp->rx_pool);
1600                goto fail;
1601        }
1602
1603        snprintf(name, sizeof(name), "tx-pool-%s", ndev->name);
1604        netcp->tx_pool = knav_pool_create(name, netcp->tx_pool_size,
1605                                                netcp->tx_pool_region_id);
1606        if (IS_ERR_OR_NULL(netcp->tx_pool)) {
1607                dev_err(netcp->ndev_dev, "Couldn't create tx pool\n");
1608                ret = PTR_ERR(netcp->tx_pool);
1609                goto fail;
1610        }
1611
1612        /* open Tx completion queue */
1613        snprintf(name, sizeof(name), "tx-compl-%s", ndev->name);
1614        netcp->tx_compl_q = knav_queue_open(name, netcp->tx_compl_qid, 0);
1615        if (IS_ERR(netcp->tx_compl_q)) {
1616                ret = PTR_ERR(netcp->tx_compl_q);
1617                goto fail;
1618        }
1619        netcp->tx_compl_qid = knav_queue_get_id(netcp->tx_compl_q);
1620
1621        /* Set notification for Tx completion */
1622        notify_cfg.fn = netcp_tx_notify;
1623        notify_cfg.fn_arg = netcp;
1624        ret = knav_queue_device_control(netcp->tx_compl_q,
1625                                        KNAV_QUEUE_SET_NOTIFIER,
1626                                        (unsigned long)&notify_cfg);
1627        if (ret)
1628                goto fail;
1629
1630        knav_queue_disable_notify(netcp->tx_compl_q);
1631
1632        /* open Rx completion queue */
1633        snprintf(name, sizeof(name), "rx-compl-%s", ndev->name);
1634        netcp->rx_queue = knav_queue_open(name, netcp->rx_queue_id, 0);
1635        if (IS_ERR(netcp->rx_queue)) {
1636                ret = PTR_ERR(netcp->rx_queue);
1637                goto fail;
1638        }
1639        netcp->rx_queue_id = knav_queue_get_id(netcp->rx_queue);
1640
1641        /* Set notification for Rx completion */
1642        notify_cfg.fn = netcp_rx_notify;
1643        notify_cfg.fn_arg = netcp;
1644        ret = knav_queue_device_control(netcp->rx_queue,
1645                                        KNAV_QUEUE_SET_NOTIFIER,
1646                                        (unsigned long)&notify_cfg);
1647        if (ret)
1648                goto fail;
1649
1650        knav_queue_disable_notify(netcp->rx_queue);
1651
1652        /* open Rx FDQs */
1653        for (i = 0; i < KNAV_DMA_FDQ_PER_CHAN && netcp->rx_queue_depths[i];
1654             ++i) {
1655                snprintf(name, sizeof(name), "rx-fdq-%s-%d", ndev->name, i);
1656                netcp->rx_fdq[i] = knav_queue_open(name, KNAV_QUEUE_GP, 0);
1657                if (IS_ERR(netcp->rx_fdq[i])) {
1658                        ret = PTR_ERR(netcp->rx_fdq[i]);
1659                        goto fail;
1660                }
1661        }
1662
1663        memset(&config, 0, sizeof(config));
1664        config.direction                = DMA_DEV_TO_MEM;
1665        config.u.rx.einfo_present       = true;
1666        config.u.rx.psinfo_present      = true;
1667        config.u.rx.err_mode            = DMA_DROP;
1668        config.u.rx.desc_type           = DMA_DESC_HOST;
1669        config.u.rx.psinfo_at_sop       = false;
1670        config.u.rx.sop_offset          = NETCP_SOP_OFFSET;
1671        config.u.rx.dst_q               = netcp->rx_queue_id;
1672        config.u.rx.thresh              = DMA_THRESH_NONE;
1673
1674        for (i = 0; i < KNAV_DMA_FDQ_PER_CHAN; ++i) {
1675                if (netcp->rx_fdq[i])
1676                        last_fdq = knav_queue_get_id(netcp->rx_fdq[i]);
1677                config.u.rx.fdq[i] = last_fdq;
1678        }
1679
1680        netcp->rx_channel = knav_dma_open_channel(netcp->netcp_device->device,
1681                                        netcp->dma_chan_name, &config);
1682        if (IS_ERR(netcp->rx_channel)) {
1683                dev_err(netcp->ndev_dev, "failed opening rx chan(%s\n",
1684                        netcp->dma_chan_name);
1685                ret = PTR_ERR(netcp->rx_channel);
1686                goto fail;
1687        }
1688
1689        dev_dbg(netcp->ndev_dev, "opened RX channel: %p\n", netcp->rx_channel);
1690        return 0;
1691
1692fail:
1693        netcp_free_navigator_resources(netcp);
1694        return ret;
1695}
1696
1697/* Open the device */
1698static int netcp_ndo_open(struct net_device *ndev)
1699{
1700        struct netcp_intf *netcp = netdev_priv(ndev);
1701        struct netcp_intf_modpriv *intf_modpriv;
1702        struct netcp_module *module;
1703        int ret;
1704
1705        netif_carrier_off(ndev);
1706        ret = netcp_setup_navigator_resources(ndev);
1707        if (ret) {
1708                dev_err(netcp->ndev_dev, "Failed to setup navigator resources\n");
1709                goto fail;
1710        }
1711
1712        for_each_module(netcp, intf_modpriv) {
1713                module = intf_modpriv->netcp_module;
1714                if (module->open) {
1715                        ret = module->open(intf_modpriv->module_priv, ndev);
1716                        if (ret != 0) {
1717                                dev_err(netcp->ndev_dev, "module open failed\n");
1718                                goto fail_open;
1719                        }
1720                }
1721        }
1722
1723        napi_enable(&netcp->rx_napi);
1724        napi_enable(&netcp->tx_napi);
1725        knav_queue_enable_notify(netcp->tx_compl_q);
1726        knav_queue_enable_notify(netcp->rx_queue);
1727        netcp_rxpool_refill(netcp);
1728        netif_tx_wake_all_queues(ndev);
1729        dev_dbg(netcp->ndev_dev, "netcp device %s opened\n", ndev->name);
1730        return 0;
1731
1732fail_open:
1733        for_each_module(netcp, intf_modpriv) {
1734                module = intf_modpriv->netcp_module;
1735                if (module->close)
1736                        module->close(intf_modpriv->module_priv, ndev);
1737        }
1738
1739fail:
1740        netcp_free_navigator_resources(netcp);
1741        return ret;
1742}
1743
1744/* Close the device */
1745static int netcp_ndo_stop(struct net_device *ndev)
1746{
1747        struct netcp_intf *netcp = netdev_priv(ndev);
1748        struct netcp_intf_modpriv *intf_modpriv;
1749        struct netcp_module *module;
1750        int err = 0;
1751
1752        netif_tx_stop_all_queues(ndev);
1753        netif_carrier_off(ndev);
1754        netcp_addr_clear_mark(netcp);
1755        netcp_addr_sweep_del(netcp);
1756        knav_queue_disable_notify(netcp->rx_queue);
1757        knav_queue_disable_notify(netcp->tx_compl_q);
1758        napi_disable(&netcp->rx_napi);
1759        napi_disable(&netcp->tx_napi);
1760
1761        for_each_module(netcp, intf_modpriv) {
1762                module = intf_modpriv->netcp_module;
1763                if (module->close) {
1764                        err = module->close(intf_modpriv->module_priv, ndev);
1765                        if (err != 0)
1766                                dev_err(netcp->ndev_dev, "Close failed\n");
1767                }
1768        }
1769
1770        /* Recycle Rx descriptors from completion queue */
1771        netcp_empty_rx_queue(netcp);
1772
1773        /* Recycle Tx descriptors from completion queue */
1774        netcp_process_tx_compl_packets(netcp, netcp->tx_pool_size);
1775
1776        if (knav_pool_count(netcp->tx_pool) != netcp->tx_pool_size)
1777                dev_err(netcp->ndev_dev, "Lost (%d) Tx descs\n",
1778                        netcp->tx_pool_size - knav_pool_count(netcp->tx_pool));
1779
1780        netcp_free_navigator_resources(netcp);
1781        dev_dbg(netcp->ndev_dev, "netcp device %s stopped\n", ndev->name);
1782        return 0;
1783}
1784
1785static int netcp_ndo_ioctl(struct net_device *ndev,
1786                           struct ifreq *req, int cmd)
1787{
1788        struct netcp_intf *netcp = netdev_priv(ndev);
1789        struct netcp_intf_modpriv *intf_modpriv;
1790        struct netcp_module *module;
1791        int ret = -1, err = -EOPNOTSUPP;
1792
1793        if (!netif_running(ndev))
1794                return -EINVAL;
1795
1796        for_each_module(netcp, intf_modpriv) {
1797                module = intf_modpriv->netcp_module;
1798                if (!module->ioctl)
1799                        continue;
1800
1801                err = module->ioctl(intf_modpriv->module_priv, req, cmd);
1802                if ((err < 0) && (err != -EOPNOTSUPP)) {
1803                        ret = err;
1804                        goto out;
1805                }
1806                if (err == 0)
1807                        ret = err;
1808        }
1809
1810out:
1811        return (ret == 0) ? 0 : err;
1812}
1813
1814static void netcp_ndo_tx_timeout(struct net_device *ndev, unsigned int txqueue)
1815{
1816        struct netcp_intf *netcp = netdev_priv(ndev);
1817        unsigned int descs = knav_pool_count(netcp->tx_pool);
1818
1819        dev_err(netcp->ndev_dev, "transmit timed out tx descs(%d)\n", descs);
1820        netcp_process_tx_compl_packets(netcp, netcp->tx_pool_size);
1821        netif_trans_update(ndev);
1822        netif_tx_wake_all_queues(ndev);
1823}
1824
1825static int netcp_rx_add_vid(struct net_device *ndev, __be16 proto, u16 vid)
1826{
1827        struct netcp_intf *netcp = netdev_priv(ndev);
1828        struct netcp_intf_modpriv *intf_modpriv;
1829        struct netcp_module *module;
1830        unsigned long flags;
1831        int err = 0;
1832
1833        dev_dbg(netcp->ndev_dev, "adding rx vlan id: %d\n", vid);
1834
1835        spin_lock_irqsave(&netcp->lock, flags);
1836        for_each_module(netcp, intf_modpriv) {
1837                module = intf_modpriv->netcp_module;
1838                if ((module->add_vid) && (vid != 0)) {
1839                        err = module->add_vid(intf_modpriv->module_priv, vid);
1840                        if (err != 0) {
1841                                dev_err(netcp->ndev_dev, "Could not add vlan id = %d\n",
1842                                        vid);
1843                                break;
1844                        }
1845                }
1846        }
1847        spin_unlock_irqrestore(&netcp->lock, flags);
1848
1849        return err;
1850}
1851
1852static int netcp_rx_kill_vid(struct net_device *ndev, __be16 proto, u16 vid)
1853{
1854        struct netcp_intf *netcp = netdev_priv(ndev);
1855        struct netcp_intf_modpriv *intf_modpriv;
1856        struct netcp_module *module;
1857        unsigned long flags;
1858        int err = 0;
1859
1860        dev_dbg(netcp->ndev_dev, "removing rx vlan id: %d\n", vid);
1861
1862        spin_lock_irqsave(&netcp->lock, flags);
1863        for_each_module(netcp, intf_modpriv) {
1864                module = intf_modpriv->netcp_module;
1865                if (module->del_vid) {
1866                        err = module->del_vid(intf_modpriv->module_priv, vid);
1867                        if (err != 0) {
1868                                dev_err(netcp->ndev_dev, "Could not delete vlan id = %d\n",
1869                                        vid);
1870                                break;
1871                        }
1872                }
1873        }
1874        spin_unlock_irqrestore(&netcp->lock, flags);
1875        return err;
1876}
1877
1878static int netcp_setup_tc(struct net_device *dev, enum tc_setup_type type,
1879                          void *type_data)
1880{
1881        struct tc_mqprio_qopt *mqprio = type_data;
1882        u8 num_tc;
1883        int i;
1884
1885        /* setup tc must be called under rtnl lock */
1886        ASSERT_RTNL();
1887
1888        if (type != TC_SETUP_QDISC_MQPRIO)
1889                return -EOPNOTSUPP;
1890
1891        mqprio->hw = TC_MQPRIO_HW_OFFLOAD_TCS;
1892        num_tc = mqprio->num_tc;
1893
1894        /* Sanity-check the number of traffic classes requested */
1895        if ((dev->real_num_tx_queues <= 1) ||
1896            (dev->real_num_tx_queues < num_tc))
1897                return -EINVAL;
1898
1899        /* Configure traffic class to queue mappings */
1900        if (num_tc) {
1901                netdev_set_num_tc(dev, num_tc);
1902                for (i = 0; i < num_tc; i++)
1903                        netdev_set_tc_queue(dev, i, 1, i);
1904        } else {
1905                netdev_reset_tc(dev);
1906        }
1907
1908        return 0;
1909}
1910
1911static void
1912netcp_get_stats(struct net_device *ndev, struct rtnl_link_stats64 *stats)
1913{
1914        struct netcp_intf *netcp = netdev_priv(ndev);
1915        struct netcp_stats *p = &netcp->stats;
1916        u64 rxpackets, rxbytes, txpackets, txbytes;
1917        unsigned int start;
1918
1919        do {
1920                start = u64_stats_fetch_begin_irq(&p->syncp_rx);
1921                rxpackets       = p->rx_packets;
1922                rxbytes         = p->rx_bytes;
1923        } while (u64_stats_fetch_retry_irq(&p->syncp_rx, start));
1924
1925        do {
1926                start = u64_stats_fetch_begin_irq(&p->syncp_tx);
1927                txpackets       = p->tx_packets;
1928                txbytes         = p->tx_bytes;
1929        } while (u64_stats_fetch_retry_irq(&p->syncp_tx, start));
1930
1931        stats->rx_packets = rxpackets;
1932        stats->rx_bytes = rxbytes;
1933        stats->tx_packets = txpackets;
1934        stats->tx_bytes = txbytes;
1935
1936        /* The following are stored as 32 bit */
1937        stats->rx_errors = p->rx_errors;
1938        stats->rx_dropped = p->rx_dropped;
1939        stats->tx_dropped = p->tx_dropped;
1940}
1941
1942static const struct net_device_ops netcp_netdev_ops = {
1943        .ndo_open               = netcp_ndo_open,
1944        .ndo_stop               = netcp_ndo_stop,
1945        .ndo_start_xmit         = netcp_ndo_start_xmit,
1946        .ndo_set_rx_mode        = netcp_set_rx_mode,
1947        .ndo_do_ioctl           = netcp_ndo_ioctl,
1948        .ndo_get_stats64        = netcp_get_stats,
1949        .ndo_set_mac_address    = eth_mac_addr,
1950        .ndo_validate_addr      = eth_validate_addr,
1951        .ndo_vlan_rx_add_vid    = netcp_rx_add_vid,
1952        .ndo_vlan_rx_kill_vid   = netcp_rx_kill_vid,
1953        .ndo_tx_timeout         = netcp_ndo_tx_timeout,
1954        .ndo_select_queue       = dev_pick_tx_zero,
1955        .ndo_setup_tc           = netcp_setup_tc,
1956};
1957
1958static int netcp_create_interface(struct netcp_device *netcp_device,
1959                                  struct device_node *node_interface)
1960{
1961        struct device *dev = netcp_device->device;
1962        struct device_node *node = dev->of_node;
1963        struct netcp_intf *netcp;
1964        struct net_device *ndev;
1965        resource_size_t size;
1966        struct resource res;
1967        void __iomem *efuse = NULL;
1968        u32 efuse_mac = 0;
1969        u8 efuse_mac_addr[6];
1970        u32 temp[2];
1971        int ret = 0;
1972
1973        ndev = alloc_etherdev_mqs(sizeof(*netcp), 1, 1);
1974        if (!ndev) {
1975                dev_err(dev, "Error allocating netdev\n");
1976                return -ENOMEM;
1977        }
1978
1979        ndev->features |= NETIF_F_SG;
1980        ndev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
1981        ndev->hw_features = ndev->features;
1982        ndev->vlan_features |=  NETIF_F_SG;
1983
1984        /* MTU range: 68 - 9486 */
1985        ndev->min_mtu = ETH_MIN_MTU;
1986        ndev->max_mtu = NETCP_MAX_FRAME_SIZE - (ETH_HLEN + ETH_FCS_LEN);
1987
1988        netcp = netdev_priv(ndev);
1989        spin_lock_init(&netcp->lock);
1990        INIT_LIST_HEAD(&netcp->module_head);
1991        INIT_LIST_HEAD(&netcp->txhook_list_head);
1992        INIT_LIST_HEAD(&netcp->rxhook_list_head);
1993        INIT_LIST_HEAD(&netcp->addr_list);
1994        u64_stats_init(&netcp->stats.syncp_rx);
1995        u64_stats_init(&netcp->stats.syncp_tx);
1996        netcp->netcp_device = netcp_device;
1997        netcp->dev = netcp_device->device;
1998        netcp->ndev = ndev;
1999        netcp->ndev_dev  = &ndev->dev;
2000        netcp->msg_enable = netif_msg_init(netcp_debug_level, NETCP_DEBUG);
2001        netcp->tx_pause_threshold = MAX_SKB_FRAGS;
2002        netcp->tx_resume_threshold = netcp->tx_pause_threshold;
2003        netcp->node_interface = node_interface;
2004
2005        ret = of_property_read_u32(node_interface, "efuse-mac", &efuse_mac);
2006        if (efuse_mac) {
2007                if (of_address_to_resource(node, NETCP_EFUSE_REG_INDEX, &res)) {
2008                        dev_err(dev, "could not find efuse-mac reg resource\n");
2009                        ret = -ENODEV;
2010                        goto quit;
2011                }
2012                size = resource_size(&res);
2013
2014                if (!devm_request_mem_region(dev, res.start, size,
2015                                             dev_name(dev))) {
2016                        dev_err(dev, "could not reserve resource\n");
2017                        ret = -ENOMEM;
2018                        goto quit;
2019                }
2020
2021                efuse = devm_ioremap(dev, res.start, size);
2022                if (!efuse) {
2023                        dev_err(dev, "could not map resource\n");
2024                        devm_release_mem_region(dev, res.start, size);
2025                        ret = -ENOMEM;
2026                        goto quit;
2027                }
2028
2029                emac_arch_get_mac_addr(efuse_mac_addr, efuse, efuse_mac);
2030                if (is_valid_ether_addr(efuse_mac_addr))
2031                        ether_addr_copy(ndev->dev_addr, efuse_mac_addr);
2032                else
2033                        eth_random_addr(ndev->dev_addr);
2034
2035                devm_iounmap(dev, efuse);
2036                devm_release_mem_region(dev, res.start, size);
2037        } else {
2038                ret = of_get_mac_address(node_interface, ndev->dev_addr);
2039                if (ret)
2040                        eth_random_addr(ndev->dev_addr);
2041        }
2042
2043        ret = of_property_read_string(node_interface, "rx-channel",
2044                                      &netcp->dma_chan_name);
2045        if (ret < 0) {
2046                dev_err(dev, "missing \"rx-channel\" parameter\n");
2047                ret = -ENODEV;
2048                goto quit;
2049        }
2050
2051        ret = of_property_read_u32(node_interface, "rx-queue",
2052                                   &netcp->rx_queue_id);
2053        if (ret < 0) {
2054                dev_warn(dev, "missing \"rx-queue\" parameter\n");
2055                netcp->rx_queue_id = KNAV_QUEUE_QPEND;
2056        }
2057
2058        ret = of_property_read_u32_array(node_interface, "rx-queue-depth",
2059                                         netcp->rx_queue_depths,
2060                                         KNAV_DMA_FDQ_PER_CHAN);
2061        if (ret < 0) {
2062                dev_err(dev, "missing \"rx-queue-depth\" parameter\n");
2063                netcp->rx_queue_depths[0] = 128;
2064        }
2065
2066        ret = of_property_read_u32_array(node_interface, "rx-pool", temp, 2);
2067        if (ret < 0) {
2068                dev_err(dev, "missing \"rx-pool\" parameter\n");
2069                ret = -ENODEV;
2070                goto quit;
2071        }
2072        netcp->rx_pool_size = temp[0];
2073        netcp->rx_pool_region_id = temp[1];
2074
2075        ret = of_property_read_u32_array(node_interface, "tx-pool", temp, 2);
2076        if (ret < 0) {
2077                dev_err(dev, "missing \"tx-pool\" parameter\n");
2078                ret = -ENODEV;
2079                goto quit;
2080        }
2081        netcp->tx_pool_size = temp[0];
2082        netcp->tx_pool_region_id = temp[1];
2083
2084        if (netcp->tx_pool_size < MAX_SKB_FRAGS) {
2085                dev_err(dev, "tx-pool size too small, must be atleast(%ld)\n",
2086                        MAX_SKB_FRAGS);
2087                ret = -ENODEV;
2088                goto quit;
2089        }
2090
2091        ret = of_property_read_u32(node_interface, "tx-completion-queue",
2092                                   &netcp->tx_compl_qid);
2093        if (ret < 0) {
2094                dev_warn(dev, "missing \"tx-completion-queue\" parameter\n");
2095                netcp->tx_compl_qid = KNAV_QUEUE_QPEND;
2096        }
2097
2098        /* NAPI register */
2099        netif_napi_add(ndev, &netcp->rx_napi, netcp_rx_poll, NETCP_NAPI_WEIGHT);
2100        netif_tx_napi_add(ndev, &netcp->tx_napi, netcp_tx_poll, NETCP_NAPI_WEIGHT);
2101
2102        /* Register the network device */
2103        ndev->dev_id            = 0;
2104        ndev->watchdog_timeo    = NETCP_TX_TIMEOUT;
2105        ndev->netdev_ops        = &netcp_netdev_ops;
2106        SET_NETDEV_DEV(ndev, dev);
2107
2108        list_add_tail(&netcp->interface_list, &netcp_device->interface_head);
2109        return 0;
2110
2111quit:
2112        free_netdev(ndev);
2113        return ret;
2114}
2115
2116static void netcp_delete_interface(struct netcp_device *netcp_device,
2117                                   struct net_device *ndev)
2118{
2119        struct netcp_intf_modpriv *intf_modpriv, *tmp;
2120        struct netcp_intf *netcp = netdev_priv(ndev);
2121        struct netcp_module *module;
2122
2123        dev_dbg(netcp_device->device, "Removing interface \"%s\"\n",
2124                ndev->name);
2125
2126        /* Notify each of the modules that the interface is going away */
2127        list_for_each_entry_safe(intf_modpriv, tmp, &netcp->module_head,
2128                                 intf_list) {
2129                module = intf_modpriv->netcp_module;
2130                dev_dbg(netcp_device->device, "Releasing module \"%s\"\n",
2131                        module->name);
2132                if (module->release)
2133                        module->release(intf_modpriv->module_priv);
2134                list_del(&intf_modpriv->intf_list);
2135        }
2136        WARN(!list_empty(&netcp->module_head), "%s interface module list is not empty!\n",
2137             ndev->name);
2138
2139        list_del(&netcp->interface_list);
2140
2141        of_node_put(netcp->node_interface);
2142        unregister_netdev(ndev);
2143        free_netdev(ndev);
2144}
2145
2146static int netcp_probe(struct platform_device *pdev)
2147{
2148        struct device_node *node = pdev->dev.of_node;
2149        struct netcp_intf *netcp_intf, *netcp_tmp;
2150        struct device_node *child, *interfaces;
2151        struct netcp_device *netcp_device;
2152        struct device *dev = &pdev->dev;
2153        struct netcp_module *module;
2154        int ret;
2155
2156        if (!knav_dma_device_ready() ||
2157            !knav_qmss_device_ready())
2158                return -EPROBE_DEFER;
2159
2160        if (!node) {
2161                dev_err(dev, "could not find device info\n");
2162                return -ENODEV;
2163        }
2164
2165        /* Allocate a new NETCP device instance */
2166        netcp_device = devm_kzalloc(dev, sizeof(*netcp_device), GFP_KERNEL);
2167        if (!netcp_device)
2168                return -ENOMEM;
2169
2170        pm_runtime_enable(&pdev->dev);
2171        ret = pm_runtime_get_sync(&pdev->dev);
2172        if (ret < 0) {
2173                dev_err(dev, "Failed to enable NETCP power-domain\n");
2174                pm_runtime_disable(&pdev->dev);
2175                return ret;
2176        }
2177
2178        /* Initialize the NETCP device instance */
2179        INIT_LIST_HEAD(&netcp_device->interface_head);
2180        INIT_LIST_HEAD(&netcp_device->modpriv_head);
2181        netcp_device->device = dev;
2182        platform_set_drvdata(pdev, netcp_device);
2183
2184        /* create interfaces */
2185        interfaces = of_get_child_by_name(node, "netcp-interfaces");
2186        if (!interfaces) {
2187                dev_err(dev, "could not find netcp-interfaces node\n");
2188                ret = -ENODEV;
2189                goto probe_quit;
2190        }
2191
2192        for_each_available_child_of_node(interfaces, child) {
2193                ret = netcp_create_interface(netcp_device, child);
2194                if (ret) {
2195                        dev_err(dev, "could not create interface(%pOFn)\n",
2196                                child);
2197                        goto probe_quit_interface;
2198                }
2199        }
2200
2201        of_node_put(interfaces);
2202
2203        /* Add the device instance to the list */
2204        list_add_tail(&netcp_device->device_list, &netcp_devices);
2205
2206        /* Probe & attach any modules already registered */
2207        mutex_lock(&netcp_modules_lock);
2208        for_each_netcp_module(module) {
2209                ret = netcp_module_probe(netcp_device, module);
2210                if (ret < 0)
2211                        dev_err(dev, "module(%s) probe failed\n", module->name);
2212        }
2213        mutex_unlock(&netcp_modules_lock);
2214        return 0;
2215
2216probe_quit_interface:
2217        list_for_each_entry_safe(netcp_intf, netcp_tmp,
2218                                 &netcp_device->interface_head,
2219                                 interface_list) {
2220                netcp_delete_interface(netcp_device, netcp_intf->ndev);
2221        }
2222
2223        of_node_put(interfaces);
2224
2225probe_quit:
2226        pm_runtime_put_sync(&pdev->dev);
2227        pm_runtime_disable(&pdev->dev);
2228        platform_set_drvdata(pdev, NULL);
2229        return ret;
2230}
2231
2232static int netcp_remove(struct platform_device *pdev)
2233{
2234        struct netcp_device *netcp_device = platform_get_drvdata(pdev);
2235        struct netcp_intf *netcp_intf, *netcp_tmp;
2236        struct netcp_inst_modpriv *inst_modpriv, *tmp;
2237        struct netcp_module *module;
2238
2239        list_for_each_entry_safe(inst_modpriv, tmp, &netcp_device->modpriv_head,
2240                                 inst_list) {
2241                module = inst_modpriv->netcp_module;
2242                dev_dbg(&pdev->dev, "Removing module \"%s\"\n", module->name);
2243                module->remove(netcp_device, inst_modpriv->module_priv);
2244                list_del(&inst_modpriv->inst_list);
2245        }
2246
2247        /* now that all modules are removed, clean up the interfaces */
2248        list_for_each_entry_safe(netcp_intf, netcp_tmp,
2249                                 &netcp_device->interface_head,
2250                                 interface_list) {
2251                netcp_delete_interface(netcp_device, netcp_intf->ndev);
2252        }
2253
2254        WARN(!list_empty(&netcp_device->interface_head),
2255             "%s interface list not empty!\n", pdev->name);
2256
2257        pm_runtime_put_sync(&pdev->dev);
2258        pm_runtime_disable(&pdev->dev);
2259        platform_set_drvdata(pdev, NULL);
2260        return 0;
2261}
2262
2263static const struct of_device_id of_match[] = {
2264        { .compatible = "ti,netcp-1.0", },
2265        {},
2266};
2267MODULE_DEVICE_TABLE(of, of_match);
2268
2269static struct platform_driver netcp_driver = {
2270        .driver = {
2271                .name           = "netcp-1.0",
2272                .of_match_table = of_match,
2273        },
2274        .probe = netcp_probe,
2275        .remove = netcp_remove,
2276};
2277module_platform_driver(netcp_driver);
2278
2279MODULE_LICENSE("GPL v2");
2280MODULE_DESCRIPTION("TI NETCP driver for Keystone SOCs");
2281MODULE_AUTHOR("Sandeep Nair <sandeep_n@ti.com");
2282
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