linux/drivers/net/rionet.c
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   1/*
   2 * rionet - Ethernet driver over RapidIO messaging services
   3 *
   4 * Copyright 2005 MontaVista Software, Inc.
   5 * Matt Porter <mporter@kernel.crashing.org>
   6 *
   7 * This program is free software; you can redistribute  it and/or modify it
   8 * under  the terms of  the GNU General  Public License as published by the
   9 * Free Software Foundation;  either version 2 of the  License, or (at your
  10 * option) any later version.
  11 */
  12
  13#include <linux/module.h>
  14#include <linux/kernel.h>
  15#include <linux/dma-mapping.h>
  16#include <linux/delay.h>
  17#include <linux/rio.h>
  18#include <linux/rio_drv.h>
  19#include <linux/slab.h>
  20#include <linux/rio_ids.h>
  21
  22#include <linux/netdevice.h>
  23#include <linux/etherdevice.h>
  24#include <linux/skbuff.h>
  25#include <linux/crc32.h>
  26#include <linux/ethtool.h>
  27
  28#define DRV_NAME        "rionet"
  29#define DRV_VERSION     "0.3"
  30#define DRV_AUTHOR      "Matt Porter <mporter@kernel.crashing.org>"
  31#define DRV_DESC        "Ethernet over RapidIO"
  32
  33MODULE_AUTHOR(DRV_AUTHOR);
  34MODULE_DESCRIPTION(DRV_DESC);
  35MODULE_LICENSE("GPL");
  36
  37#define RIONET_DEFAULT_MSGLEVEL \
  38                        (NETIF_MSG_DRV          | \
  39                         NETIF_MSG_LINK         | \
  40                         NETIF_MSG_RX_ERR       | \
  41                         NETIF_MSG_TX_ERR)
  42
  43#define RIONET_DOORBELL_JOIN    0x1000
  44#define RIONET_DOORBELL_LEAVE   0x1001
  45
  46#define RIONET_MAILBOX          0
  47
  48#define RIONET_TX_RING_SIZE     CONFIG_RIONET_TX_SIZE
  49#define RIONET_RX_RING_SIZE     CONFIG_RIONET_RX_SIZE
  50#define RIONET_MAX_NETS         8
  51
  52struct rionet_private {
  53        struct rio_mport *mport;
  54        struct sk_buff *rx_skb[RIONET_RX_RING_SIZE];
  55        struct sk_buff *tx_skb[RIONET_TX_RING_SIZE];
  56        int rx_slot;
  57        int tx_slot;
  58        int tx_cnt;
  59        int ack_slot;
  60        spinlock_t lock;
  61        spinlock_t tx_lock;
  62        u32 msg_enable;
  63};
  64
  65struct rionet_peer {
  66        struct list_head node;
  67        struct rio_dev *rdev;
  68        struct resource *res;
  69};
  70
  71struct rionet_net {
  72        struct net_device *ndev;
  73        struct list_head peers;
  74        struct rio_dev **active;
  75        int nact;       /* number of active peers */
  76};
  77
  78static struct rionet_net nets[RIONET_MAX_NETS];
  79
  80#define is_rionet_capable(src_ops, dst_ops)                     \
  81                        ((src_ops & RIO_SRC_OPS_DATA_MSG) &&    \
  82                         (dst_ops & RIO_DST_OPS_DATA_MSG) &&    \
  83                         (src_ops & RIO_SRC_OPS_DOORBELL) &&    \
  84                         (dst_ops & RIO_DST_OPS_DOORBELL))
  85#define dev_rionet_capable(dev) \
  86        is_rionet_capable(dev->src_ops, dev->dst_ops)
  87
  88#define RIONET_MAC_MATCH(x)     (!memcmp((x), "\00\01\00\01", 4))
  89#define RIONET_GET_DESTID(x)    ((*((u8 *)x + 4) << 8) | *((u8 *)x + 5))
  90
  91static int rionet_rx_clean(struct net_device *ndev)
  92{
  93        int i;
  94        int error = 0;
  95        struct rionet_private *rnet = netdev_priv(ndev);
  96        void *data;
  97
  98        i = rnet->rx_slot;
  99
 100        do {
 101                if (!rnet->rx_skb[i])
 102                        continue;
 103
 104                if (!(data = rio_get_inb_message(rnet->mport, RIONET_MAILBOX)))
 105                        break;
 106
 107                rnet->rx_skb[i]->data = data;
 108                skb_put(rnet->rx_skb[i], RIO_MAX_MSG_SIZE);
 109                rnet->rx_skb[i]->protocol =
 110                    eth_type_trans(rnet->rx_skb[i], ndev);
 111                error = netif_rx(rnet->rx_skb[i]);
 112
 113                if (error == NET_RX_DROP) {
 114                        ndev->stats.rx_dropped++;
 115                } else {
 116                        ndev->stats.rx_packets++;
 117                        ndev->stats.rx_bytes += RIO_MAX_MSG_SIZE;
 118                }
 119
 120        } while ((i = (i + 1) % RIONET_RX_RING_SIZE) != rnet->rx_slot);
 121
 122        return i;
 123}
 124
 125static void rionet_rx_fill(struct net_device *ndev, int end)
 126{
 127        int i;
 128        struct rionet_private *rnet = netdev_priv(ndev);
 129
 130        i = rnet->rx_slot;
 131        do {
 132                rnet->rx_skb[i] = dev_alloc_skb(RIO_MAX_MSG_SIZE);
 133
 134                if (!rnet->rx_skb[i])
 135                        break;
 136
 137                rio_add_inb_buffer(rnet->mport, RIONET_MAILBOX,
 138                                   rnet->rx_skb[i]->data);
 139        } while ((i = (i + 1) % RIONET_RX_RING_SIZE) != end);
 140
 141        rnet->rx_slot = i;
 142}
 143
 144static int rionet_queue_tx_msg(struct sk_buff *skb, struct net_device *ndev,
 145                               struct rio_dev *rdev)
 146{
 147        struct rionet_private *rnet = netdev_priv(ndev);
 148
 149        rio_add_outb_message(rnet->mport, rdev, 0, skb->data, skb->len);
 150        rnet->tx_skb[rnet->tx_slot] = skb;
 151
 152        ndev->stats.tx_packets++;
 153        ndev->stats.tx_bytes += skb->len;
 154
 155        if (++rnet->tx_cnt == RIONET_TX_RING_SIZE)
 156                netif_stop_queue(ndev);
 157
 158        ++rnet->tx_slot;
 159        rnet->tx_slot &= (RIONET_TX_RING_SIZE - 1);
 160
 161        if (netif_msg_tx_queued(rnet))
 162                printk(KERN_INFO "%s: queued skb len %8.8x\n", DRV_NAME,
 163                       skb->len);
 164
 165        return 0;
 166}
 167
 168static int rionet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
 169{
 170        int i;
 171        struct rionet_private *rnet = netdev_priv(ndev);
 172        struct ethhdr *eth = (struct ethhdr *)skb->data;
 173        u16 destid;
 174        unsigned long flags;
 175        int add_num = 1;
 176
 177        local_irq_save(flags);
 178        if (!spin_trylock(&rnet->tx_lock)) {
 179                local_irq_restore(flags);
 180                return NETDEV_TX_LOCKED;
 181        }
 182
 183        if (is_multicast_ether_addr(eth->h_dest))
 184                add_num = nets[rnet->mport->id].nact;
 185
 186        if ((rnet->tx_cnt + add_num) > RIONET_TX_RING_SIZE) {
 187                netif_stop_queue(ndev);
 188                spin_unlock_irqrestore(&rnet->tx_lock, flags);
 189                printk(KERN_ERR "%s: BUG! Tx Ring full when queue awake!\n",
 190                       ndev->name);
 191                return NETDEV_TX_BUSY;
 192        }
 193
 194        if (is_multicast_ether_addr(eth->h_dest)) {
 195                int count = 0;
 196
 197                for (i = 0; i < RIO_MAX_ROUTE_ENTRIES(rnet->mport->sys_size);
 198                                i++)
 199                        if (nets[rnet->mport->id].active[i]) {
 200                                rionet_queue_tx_msg(skb, ndev,
 201                                        nets[rnet->mport->id].active[i]);
 202                                if (count)
 203                                        atomic_inc(&skb->users);
 204                                count++;
 205                        }
 206        } else if (RIONET_MAC_MATCH(eth->h_dest)) {
 207                destid = RIONET_GET_DESTID(eth->h_dest);
 208                if (nets[rnet->mport->id].active[destid])
 209                        rionet_queue_tx_msg(skb, ndev,
 210                                        nets[rnet->mport->id].active[destid]);
 211        }
 212
 213        spin_unlock_irqrestore(&rnet->tx_lock, flags);
 214
 215        return NETDEV_TX_OK;
 216}
 217
 218static void rionet_dbell_event(struct rio_mport *mport, void *dev_id, u16 sid, u16 tid,
 219                               u16 info)
 220{
 221        struct net_device *ndev = dev_id;
 222        struct rionet_private *rnet = netdev_priv(ndev);
 223        struct rionet_peer *peer;
 224
 225        if (netif_msg_intr(rnet))
 226                printk(KERN_INFO "%s: doorbell sid %4.4x tid %4.4x info %4.4x",
 227                       DRV_NAME, sid, tid, info);
 228        if (info == RIONET_DOORBELL_JOIN) {
 229                if (!nets[rnet->mport->id].active[sid]) {
 230                        list_for_each_entry(peer,
 231                                           &nets[rnet->mport->id].peers, node) {
 232                                if (peer->rdev->destid == sid) {
 233                                        nets[rnet->mport->id].active[sid] =
 234                                                                peer->rdev;
 235                                        nets[rnet->mport->id].nact++;
 236                                }
 237                        }
 238                        rio_mport_send_doorbell(mport, sid,
 239                                                RIONET_DOORBELL_JOIN);
 240                }
 241        } else if (info == RIONET_DOORBELL_LEAVE) {
 242                nets[rnet->mport->id].active[sid] = NULL;
 243                nets[rnet->mport->id].nact--;
 244        } else {
 245                if (netif_msg_intr(rnet))
 246                        printk(KERN_WARNING "%s: unhandled doorbell\n",
 247                               DRV_NAME);
 248        }
 249}
 250
 251static void rionet_inb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
 252{
 253        int n;
 254        struct net_device *ndev = dev_id;
 255        struct rionet_private *rnet = netdev_priv(ndev);
 256
 257        if (netif_msg_intr(rnet))
 258                printk(KERN_INFO "%s: inbound message event, mbox %d slot %d\n",
 259                       DRV_NAME, mbox, slot);
 260
 261        spin_lock(&rnet->lock);
 262        if ((n = rionet_rx_clean(ndev)) != rnet->rx_slot)
 263                rionet_rx_fill(ndev, n);
 264        spin_unlock(&rnet->lock);
 265}
 266
 267static void rionet_outb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
 268{
 269        struct net_device *ndev = dev_id;
 270        struct rionet_private *rnet = netdev_priv(ndev);
 271
 272        spin_lock(&rnet->lock);
 273
 274        if (netif_msg_intr(rnet))
 275                printk(KERN_INFO
 276                       "%s: outbound message event, mbox %d slot %d\n",
 277                       DRV_NAME, mbox, slot);
 278
 279        while (rnet->tx_cnt && (rnet->ack_slot != slot)) {
 280                /* dma unmap single */
 281                dev_kfree_skb_irq(rnet->tx_skb[rnet->ack_slot]);
 282                rnet->tx_skb[rnet->ack_slot] = NULL;
 283                ++rnet->ack_slot;
 284                rnet->ack_slot &= (RIONET_TX_RING_SIZE - 1);
 285                rnet->tx_cnt--;
 286        }
 287
 288        if (rnet->tx_cnt < RIONET_TX_RING_SIZE)
 289                netif_wake_queue(ndev);
 290
 291        spin_unlock(&rnet->lock);
 292}
 293
 294static int rionet_open(struct net_device *ndev)
 295{
 296        int i, rc = 0;
 297        struct rionet_peer *peer, *tmp;
 298        struct rionet_private *rnet = netdev_priv(ndev);
 299
 300        if (netif_msg_ifup(rnet))
 301                printk(KERN_INFO "%s: open\n", DRV_NAME);
 302
 303        if ((rc = rio_request_inb_dbell(rnet->mport,
 304                                        (void *)ndev,
 305                                        RIONET_DOORBELL_JOIN,
 306                                        RIONET_DOORBELL_LEAVE,
 307                                        rionet_dbell_event)) < 0)
 308                goto out;
 309
 310        if ((rc = rio_request_inb_mbox(rnet->mport,
 311                                       (void *)ndev,
 312                                       RIONET_MAILBOX,
 313                                       RIONET_RX_RING_SIZE,
 314                                       rionet_inb_msg_event)) < 0)
 315                goto out;
 316
 317        if ((rc = rio_request_outb_mbox(rnet->mport,
 318                                        (void *)ndev,
 319                                        RIONET_MAILBOX,
 320                                        RIONET_TX_RING_SIZE,
 321                                        rionet_outb_msg_event)) < 0)
 322                goto out;
 323
 324        /* Initialize inbound message ring */
 325        for (i = 0; i < RIONET_RX_RING_SIZE; i++)
 326                rnet->rx_skb[i] = NULL;
 327        rnet->rx_slot = 0;
 328        rionet_rx_fill(ndev, 0);
 329
 330        rnet->tx_slot = 0;
 331        rnet->tx_cnt = 0;
 332        rnet->ack_slot = 0;
 333
 334        netif_carrier_on(ndev);
 335        netif_start_queue(ndev);
 336
 337        list_for_each_entry_safe(peer, tmp,
 338                                 &nets[rnet->mport->id].peers, node) {
 339                if (!(peer->res = rio_request_outb_dbell(peer->rdev,
 340                                                         RIONET_DOORBELL_JOIN,
 341                                                         RIONET_DOORBELL_LEAVE)))
 342                {
 343                        printk(KERN_ERR "%s: error requesting doorbells\n",
 344                               DRV_NAME);
 345                        continue;
 346                }
 347
 348                /* Send a join message */
 349                rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
 350        }
 351
 352      out:
 353        return rc;
 354}
 355
 356static int rionet_close(struct net_device *ndev)
 357{
 358        struct rionet_private *rnet = netdev_priv(ndev);
 359        struct rionet_peer *peer, *tmp;
 360        int i;
 361
 362        if (netif_msg_ifup(rnet))
 363                printk(KERN_INFO "%s: close %s\n", DRV_NAME, ndev->name);
 364
 365        netif_stop_queue(ndev);
 366        netif_carrier_off(ndev);
 367
 368        for (i = 0; i < RIONET_RX_RING_SIZE; i++)
 369                kfree_skb(rnet->rx_skb[i]);
 370
 371        list_for_each_entry_safe(peer, tmp,
 372                                 &nets[rnet->mport->id].peers, node) {
 373                if (nets[rnet->mport->id].active[peer->rdev->destid]) {
 374                        rio_send_doorbell(peer->rdev, RIONET_DOORBELL_LEAVE);
 375                        nets[rnet->mport->id].active[peer->rdev->destid] = NULL;
 376                }
 377                rio_release_outb_dbell(peer->rdev, peer->res);
 378        }
 379
 380        rio_release_inb_dbell(rnet->mport, RIONET_DOORBELL_JOIN,
 381                              RIONET_DOORBELL_LEAVE);
 382        rio_release_inb_mbox(rnet->mport, RIONET_MAILBOX);
 383        rio_release_outb_mbox(rnet->mport, RIONET_MAILBOX);
 384
 385        return 0;
 386}
 387
 388static void rionet_remove(struct rio_dev *rdev)
 389{
 390        struct net_device *ndev = rio_get_drvdata(rdev);
 391        unsigned char netid = rdev->net->hport->id;
 392        struct rionet_peer *peer, *tmp;
 393
 394        unregister_netdev(ndev);
 395
 396        free_pages((unsigned long)nets[netid].active, get_order(sizeof(void *) *
 397                        RIO_MAX_ROUTE_ENTRIES(rdev->net->hport->sys_size)));
 398        nets[netid].active = NULL;
 399
 400        list_for_each_entry_safe(peer, tmp, &nets[netid].peers, node) {
 401                list_del(&peer->node);
 402                kfree(peer);
 403        }
 404
 405        free_netdev(ndev);
 406}
 407
 408static void rionet_get_drvinfo(struct net_device *ndev,
 409                               struct ethtool_drvinfo *info)
 410{
 411        struct rionet_private *rnet = netdev_priv(ndev);
 412
 413        strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
 414        strlcpy(info->version, DRV_VERSION, sizeof(info->version));
 415        strlcpy(info->fw_version, "n/a", sizeof(info->fw_version));
 416        strlcpy(info->bus_info, rnet->mport->name, sizeof(info->bus_info));
 417}
 418
 419static u32 rionet_get_msglevel(struct net_device *ndev)
 420{
 421        struct rionet_private *rnet = netdev_priv(ndev);
 422
 423        return rnet->msg_enable;
 424}
 425
 426static void rionet_set_msglevel(struct net_device *ndev, u32 value)
 427{
 428        struct rionet_private *rnet = netdev_priv(ndev);
 429
 430        rnet->msg_enable = value;
 431}
 432
 433static const struct ethtool_ops rionet_ethtool_ops = {
 434        .get_drvinfo = rionet_get_drvinfo,
 435        .get_msglevel = rionet_get_msglevel,
 436        .set_msglevel = rionet_set_msglevel,
 437        .get_link = ethtool_op_get_link,
 438};
 439
 440static const struct net_device_ops rionet_netdev_ops = {
 441        .ndo_open               = rionet_open,
 442        .ndo_stop               = rionet_close,
 443        .ndo_start_xmit         = rionet_start_xmit,
 444        .ndo_change_mtu         = eth_change_mtu,
 445        .ndo_validate_addr      = eth_validate_addr,
 446        .ndo_set_mac_address    = eth_mac_addr,
 447};
 448
 449static int rionet_setup_netdev(struct rio_mport *mport, struct net_device *ndev)
 450{
 451        int rc = 0;
 452        struct rionet_private *rnet;
 453        u16 device_id;
 454        const size_t rionet_active_bytes = sizeof(void *) *
 455                                RIO_MAX_ROUTE_ENTRIES(mport->sys_size);
 456
 457        nets[mport->id].active = (struct rio_dev **)__get_free_pages(GFP_KERNEL,
 458                                                get_order(rionet_active_bytes));
 459        if (!nets[mport->id].active) {
 460                rc = -ENOMEM;
 461                goto out;
 462        }
 463        memset((void *)nets[mport->id].active, 0, rionet_active_bytes);
 464
 465        /* Set up private area */
 466        rnet = netdev_priv(ndev);
 467        rnet->mport = mport;
 468
 469        /* Set the default MAC address */
 470        device_id = rio_local_get_device_id(mport);
 471        ndev->dev_addr[0] = 0x00;
 472        ndev->dev_addr[1] = 0x01;
 473        ndev->dev_addr[2] = 0x00;
 474        ndev->dev_addr[3] = 0x01;
 475        ndev->dev_addr[4] = device_id >> 8;
 476        ndev->dev_addr[5] = device_id & 0xff;
 477
 478        ndev->netdev_ops = &rionet_netdev_ops;
 479        ndev->mtu = RIO_MAX_MSG_SIZE - 14;
 480        ndev->features = NETIF_F_LLTX;
 481        SET_ETHTOOL_OPS(ndev, &rionet_ethtool_ops);
 482
 483        spin_lock_init(&rnet->lock);
 484        spin_lock_init(&rnet->tx_lock);
 485
 486        rnet->msg_enable = RIONET_DEFAULT_MSGLEVEL;
 487
 488        rc = register_netdev(ndev);
 489        if (rc != 0)
 490                goto out;
 491
 492        printk(KERN_INFO "%s: %s %s Version %s, MAC %pM, %s\n",
 493               ndev->name,
 494               DRV_NAME,
 495               DRV_DESC,
 496               DRV_VERSION,
 497               ndev->dev_addr,
 498               mport->name);
 499
 500      out:
 501        return rc;
 502}
 503
 504static unsigned long net_table[RIONET_MAX_NETS/sizeof(unsigned long) + 1];
 505
 506static int rionet_probe(struct rio_dev *rdev, const struct rio_device_id *id)
 507{
 508        int rc = -ENODEV;
 509        u32 lsrc_ops, ldst_ops;
 510        struct rionet_peer *peer;
 511        struct net_device *ndev = NULL;
 512        unsigned char netid = rdev->net->hport->id;
 513        int oldnet;
 514
 515        if (netid >= RIONET_MAX_NETS)
 516                return rc;
 517
 518        oldnet = test_and_set_bit(netid, net_table);
 519
 520        /*
 521         * First time through, make sure local device is rionet
 522         * capable, setup netdev (will be skipped on later probes)
 523         */
 524        if (!oldnet) {
 525                rio_local_read_config_32(rdev->net->hport, RIO_SRC_OPS_CAR,
 526                                         &lsrc_ops);
 527                rio_local_read_config_32(rdev->net->hport, RIO_DST_OPS_CAR,
 528                                         &ldst_ops);
 529                if (!is_rionet_capable(lsrc_ops, ldst_ops)) {
 530                        printk(KERN_ERR
 531                               "%s: local device %s is not network capable\n",
 532                               DRV_NAME, rdev->net->hport->name);
 533                        goto out;
 534                }
 535
 536                /* Allocate our net_device structure */
 537                ndev = alloc_etherdev(sizeof(struct rionet_private));
 538                if (ndev == NULL) {
 539                        rc = -ENOMEM;
 540                        goto out;
 541                }
 542                nets[netid].ndev = ndev;
 543                rc = rionet_setup_netdev(rdev->net->hport, ndev);
 544                INIT_LIST_HEAD(&nets[netid].peers);
 545                nets[netid].nact = 0;
 546        } else if (nets[netid].ndev == NULL)
 547                goto out;
 548
 549        /*
 550         * If the remote device has mailbox/doorbell capabilities,
 551         * add it to the peer list.
 552         */
 553        if (dev_rionet_capable(rdev)) {
 554                if (!(peer = kmalloc(sizeof(struct rionet_peer), GFP_KERNEL))) {
 555                        rc = -ENOMEM;
 556                        goto out;
 557                }
 558                peer->rdev = rdev;
 559                list_add_tail(&peer->node, &nets[netid].peers);
 560        }
 561
 562        rio_set_drvdata(rdev, nets[netid].ndev);
 563
 564      out:
 565        return rc;
 566}
 567
 568static struct rio_device_id rionet_id_table[] = {
 569        {RIO_DEVICE(RIO_ANY_ID, RIO_ANY_ID)}
 570};
 571
 572static struct rio_driver rionet_driver = {
 573        .name = "rionet",
 574        .id_table = rionet_id_table,
 575        .probe = rionet_probe,
 576        .remove = rionet_remove,
 577};
 578
 579static int __init rionet_init(void)
 580{
 581        return rio_register_driver(&rionet_driver);
 582}
 583
 584static void __exit rionet_exit(void)
 585{
 586        rio_unregister_driver(&rionet_driver);
 587}
 588
 589late_initcall(rionet_init);
 590module_exit(rionet_exit);
 591
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