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     "0.2"
  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
  51static LIST_HEAD(rionet_peers);
  52
  53struct rionet_private {
  54        struct rio_mport *mport;
  55        struct sk_buff *rx_skb[RIONET_RX_RING_SIZE];
  56        struct sk_buff *tx_skb[RIONET_TX_RING_SIZE];
  57        int rx_slot;
  58        int tx_slot;
  59        int tx_cnt;
  60        int ack_slot;
  61        spinlock_t lock;
  62        spinlock_t tx_lock;
  63        u32 msg_enable;
  64};
  65
  66struct rionet_peer {
  67        struct list_head node;
  68        struct rio_dev *rdev;
  69        struct resource *res;
  70};
  71
  72static int rionet_check = 0;
  73static int rionet_capable = 1;
  74
  75/*
  76 * This is a fast lookup table for translating TX
  77 * Ethernet packets into a destination RIO device. It
  78 * could be made into a hash table to save memory depending
  79 * on system trade-offs.
  80 */
  81static struct rio_dev **rionet_active;
  82static int nact;        /* total number of active rionet peers */
  83
  84#define is_rionet_capable(src_ops, dst_ops)                     \
  85                        ((src_ops & RIO_SRC_OPS_DATA_MSG) &&    \
  86                         (dst_ops & RIO_DST_OPS_DATA_MSG) &&    \
  87                         (src_ops & RIO_SRC_OPS_DOORBELL) &&    \
  88                         (dst_ops & RIO_DST_OPS_DOORBELL))
  89#define dev_rionet_capable(dev) \
  90        is_rionet_capable(dev->src_ops, dev->dst_ops)
  91
  92#define RIONET_MAC_MATCH(x)     (!memcmp((x), "\00\01\00\01", 4))
  93#define RIONET_GET_DESTID(x)    ((*((u8 *)x + 4) << 8) | *((u8 *)x + 5))
  94
  95static int rionet_rx_clean(struct net_device *ndev)
  96{
  97        int i;
  98        int error = 0;
  99        struct rionet_private *rnet = netdev_priv(ndev);
 100        void *data;
 101
 102        i = rnet->rx_slot;
 103
 104        do {
 105                if (!rnet->rx_skb[i])
 106                        continue;
 107
 108                if (!(data = rio_get_inb_message(rnet->mport, RIONET_MAILBOX)))
 109                        break;
 110
 111                rnet->rx_skb[i]->data = data;
 112                skb_put(rnet->rx_skb[i], RIO_MAX_MSG_SIZE);
 113                rnet->rx_skb[i]->protocol =
 114                    eth_type_trans(rnet->rx_skb[i], ndev);
 115                error = netif_rx(rnet->rx_skb[i]);
 116
 117                if (error == NET_RX_DROP) {
 118                        ndev->stats.rx_dropped++;
 119                } else {
 120                        ndev->stats.rx_packets++;
 121                        ndev->stats.rx_bytes += RIO_MAX_MSG_SIZE;
 122                }
 123
 124        } while ((i = (i + 1) % RIONET_RX_RING_SIZE) != rnet->rx_slot);
 125
 126        return i;
 127}
 128
 129static void rionet_rx_fill(struct net_device *ndev, int end)
 130{
 131        int i;
 132        struct rionet_private *rnet = netdev_priv(ndev);
 133
 134        i = rnet->rx_slot;
 135        do {
 136                rnet->rx_skb[i] = dev_alloc_skb(RIO_MAX_MSG_SIZE);
 137
 138                if (!rnet->rx_skb[i])
 139                        break;
 140
 141                rio_add_inb_buffer(rnet->mport, RIONET_MAILBOX,
 142                                   rnet->rx_skb[i]->data);
 143        } while ((i = (i + 1) % RIONET_RX_RING_SIZE) != end);
 144
 145        rnet->rx_slot = i;
 146}
 147
 148static int rionet_queue_tx_msg(struct sk_buff *skb, struct net_device *ndev,
 149                               struct rio_dev *rdev)
 150{
 151        struct rionet_private *rnet = netdev_priv(ndev);
 152
 153        rio_add_outb_message(rnet->mport, rdev, 0, skb->data, skb->len);
 154        rnet->tx_skb[rnet->tx_slot] = skb;
 155
 156        ndev->stats.tx_packets++;
 157        ndev->stats.tx_bytes += skb->len;
 158
 159        if (++rnet->tx_cnt == RIONET_TX_RING_SIZE)
 160                netif_stop_queue(ndev);
 161
 162        ++rnet->tx_slot;
 163        rnet->tx_slot &= (RIONET_TX_RING_SIZE - 1);
 164
 165        if (netif_msg_tx_queued(rnet))
 166                printk(KERN_INFO "%s: queued skb len %8.8x\n", DRV_NAME,
 167                       skb->len);
 168
 169        return 0;
 170}
 171
 172static int rionet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
 173{
 174        int i;
 175        struct rionet_private *rnet = netdev_priv(ndev);
 176        struct ethhdr *eth = (struct ethhdr *)skb->data;
 177        u16 destid;
 178        unsigned long flags;
 179        int add_num = 1;
 180
 181        local_irq_save(flags);
 182        if (!spin_trylock(&rnet->tx_lock)) {
 183                local_irq_restore(flags);
 184                return NETDEV_TX_LOCKED;
 185        }
 186
 187        if (is_multicast_ether_addr(eth->h_dest))
 188                add_num = nact;
 189
 190        if ((rnet->tx_cnt + add_num) > RIONET_TX_RING_SIZE) {
 191                netif_stop_queue(ndev);
 192                spin_unlock_irqrestore(&rnet->tx_lock, flags);
 193                printk(KERN_ERR "%s: BUG! Tx Ring full when queue awake!\n",
 194                       ndev->name);
 195                return NETDEV_TX_BUSY;
 196        }
 197
 198        if (is_multicast_ether_addr(eth->h_dest)) {
 199                int count = 0;
 200                for (i = 0; i < RIO_MAX_ROUTE_ENTRIES(rnet->mport->sys_size);
 201                                i++)
 202                        if (rionet_active[i]) {
 203                                rionet_queue_tx_msg(skb, ndev,
 204                                                    rionet_active[i]);
 205                                if (count)
 206                                        atomic_inc(&skb->users);
 207                                count++;
 208                        }
 209        } else if (RIONET_MAC_MATCH(eth->h_dest)) {
 210                destid = RIONET_GET_DESTID(eth->h_dest);
 211                if (rionet_active[destid])
 212                        rionet_queue_tx_msg(skb, ndev, rionet_active[destid]);
 213        }
 214
 215        spin_unlock_irqrestore(&rnet->tx_lock, flags);
 216
 217        return NETDEV_TX_OK;
 218}
 219
 220static void rionet_dbell_event(struct rio_mport *mport, void *dev_id, u16 sid, u16 tid,
 221                               u16 info)
 222{
 223        struct net_device *ndev = dev_id;
 224        struct rionet_private *rnet = netdev_priv(ndev);
 225        struct rionet_peer *peer;
 226
 227        if (netif_msg_intr(rnet))
 228                printk(KERN_INFO "%s: doorbell sid %4.4x tid %4.4x info %4.4x",
 229                       DRV_NAME, sid, tid, info);
 230        if (info == RIONET_DOORBELL_JOIN) {
 231                if (!rionet_active[sid]) {
 232                        list_for_each_entry(peer, &rionet_peers, node) {
 233                                if (peer->rdev->destid == sid) {
 234                                        rionet_active[sid] = peer->rdev;
 235                                        nact++;
 236                                }
 237                        }
 238                        rio_mport_send_doorbell(mport, sid,
 239                                                RIONET_DOORBELL_JOIN);
 240                }
 241        } else if (info == RIONET_DOORBELL_LEAVE) {
 242                rionet_active[sid] = NULL;
 243                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, &rionet_peers, node) {
 338                if (!(peer->res = rio_request_outb_dbell(peer->rdev,
 339                                                         RIONET_DOORBELL_JOIN,
 340                                                         RIONET_DOORBELL_LEAVE)))
 341                {
 342                        printk(KERN_ERR "%s: error requesting doorbells\n",
 343                               DRV_NAME);
 344                        continue;
 345                }
 346
 347                /* Send a join message */
 348                rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
 349        }
 350
 351      out:
 352        return rc;
 353}
 354
 355static int rionet_close(struct net_device *ndev)
 356{
 357        struct rionet_private *rnet = netdev_priv(ndev);
 358        struct rionet_peer *peer, *tmp;
 359        int i;
 360
 361        if (netif_msg_ifup(rnet))
 362                printk(KERN_INFO "%s: close\n", DRV_NAME);
 363
 364        netif_stop_queue(ndev);
 365        netif_carrier_off(ndev);
 366
 367        for (i = 0; i < RIONET_RX_RING_SIZE; i++)
 368                kfree_skb(rnet->rx_skb[i]);
 369
 370        list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
 371                if (rionet_active[peer->rdev->destid]) {
 372                        rio_send_doorbell(peer->rdev, RIONET_DOORBELL_LEAVE);
 373                        rionet_active[peer->rdev->destid] = NULL;
 374                }
 375                rio_release_outb_dbell(peer->rdev, peer->res);
 376        }
 377
 378        rio_release_inb_dbell(rnet->mport, RIONET_DOORBELL_JOIN,
 379                              RIONET_DOORBELL_LEAVE);
 380        rio_release_inb_mbox(rnet->mport, RIONET_MAILBOX);
 381        rio_release_outb_mbox(rnet->mport, RIONET_MAILBOX);
 382
 383        return 0;
 384}
 385
 386static void rionet_remove(struct rio_dev *rdev)
 387{
 388        struct net_device *ndev = rio_get_drvdata(rdev);
 389        struct rionet_peer *peer, *tmp;
 390
 391        free_pages((unsigned long)rionet_active, get_order(sizeof(void *) *
 392                        RIO_MAX_ROUTE_ENTRIES(rdev->net->hport->sys_size)));
 393        unregister_netdev(ndev);
 394        free_netdev(ndev);
 395
 396        list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
 397                list_del(&peer->node);
 398                kfree(peer);
 399        }
 400}
 401
 402static void rionet_get_drvinfo(struct net_device *ndev,
 403                               struct ethtool_drvinfo *info)
 404{
 405        struct rionet_private *rnet = netdev_priv(ndev);
 406
 407        strcpy(info->driver, DRV_NAME);
 408        strcpy(info->version, DRV_VERSION);
 409        strcpy(info->fw_version, "n/a");
 410        strcpy(info->bus_info, rnet->mport->name);
 411}
 412
 413static u32 rionet_get_msglevel(struct net_device *ndev)
 414{
 415        struct rionet_private *rnet = netdev_priv(ndev);
 416
 417        return rnet->msg_enable;
 418}
 419
 420static void rionet_set_msglevel(struct net_device *ndev, u32 value)
 421{
 422        struct rionet_private *rnet = netdev_priv(ndev);
 423
 424        rnet->msg_enable = value;
 425}
 426
 427static const struct ethtool_ops rionet_ethtool_ops = {
 428        .get_drvinfo = rionet_get_drvinfo,
 429        .get_msglevel = rionet_get_msglevel,
 430        .set_msglevel = rionet_set_msglevel,
 431        .get_link = ethtool_op_get_link,
 432};
 433
 434static const struct net_device_ops rionet_netdev_ops = {
 435        .ndo_open               = rionet_open,
 436        .ndo_stop               = rionet_close,
 437        .ndo_start_xmit         = rionet_start_xmit,
 438        .ndo_change_mtu         = eth_change_mtu,
 439        .ndo_validate_addr      = eth_validate_addr,
 440        .ndo_set_mac_address    = eth_mac_addr,
 441};
 442
 443static int rionet_setup_netdev(struct rio_mport *mport, struct net_device *ndev)
 444{
 445        int rc = 0;
 446        struct rionet_private *rnet;
 447        u16 device_id;
 448        const size_t rionet_active_bytes = sizeof(void *) *
 449                                RIO_MAX_ROUTE_ENTRIES(mport->sys_size);
 450
 451        rionet_active = (struct rio_dev **)__get_free_pages(GFP_KERNEL,
 452                        get_order(rionet_active_bytes));
 453        if (!rionet_active) {
 454                rc = -ENOMEM;
 455                goto out;
 456        }
 457        memset((void *)rionet_active, 0, rionet_active_bytes);
 458
 459        /* Set up private area */
 460        rnet = netdev_priv(ndev);
 461        rnet->mport = mport;
 462
 463        /* Set the default MAC address */
 464        device_id = rio_local_get_device_id(mport);
 465        ndev->dev_addr[0] = 0x00;
 466        ndev->dev_addr[1] = 0x01;
 467        ndev->dev_addr[2] = 0x00;
 468        ndev->dev_addr[3] = 0x01;
 469        ndev->dev_addr[4] = device_id >> 8;
 470        ndev->dev_addr[5] = device_id & 0xff;
 471
 472        ndev->netdev_ops = &rionet_netdev_ops;
 473        ndev->mtu = RIO_MAX_MSG_SIZE - 14;
 474        ndev->features = NETIF_F_LLTX;
 475        SET_ETHTOOL_OPS(ndev, &rionet_ethtool_ops);
 476
 477        spin_lock_init(&rnet->lock);
 478        spin_lock_init(&rnet->tx_lock);
 479
 480        rnet->msg_enable = RIONET_DEFAULT_MSGLEVEL;
 481
 482        rc = register_netdev(ndev);
 483        if (rc != 0)
 484                goto out;
 485
 486        printk("%s: %s %s Version %s, MAC %pM\n",
 487               ndev->name,
 488               DRV_NAME,
 489               DRV_DESC,
 490               DRV_VERSION,
 491               ndev->dev_addr);
 492
 493      out:
 494        return rc;
 495}
 496
 497/*
 498 * XXX Make multi-net safe
 499 */
 500static int rionet_probe(struct rio_dev *rdev, const struct rio_device_id *id)
 501{
 502        int rc = -ENODEV;
 503        u32 lsrc_ops, ldst_ops;
 504        struct rionet_peer *peer;
 505        struct net_device *ndev = NULL;
 506
 507        /* If local device is not rionet capable, give up quickly */
 508        if (!rionet_capable)
 509                goto out;
 510
 511        /* Allocate our net_device structure */
 512        ndev = alloc_etherdev(sizeof(struct rionet_private));
 513        if (ndev == NULL) {
 514                rc = -ENOMEM;
 515                goto out;
 516        }
 517
 518        /*
 519         * First time through, make sure local device is rionet
 520         * capable, setup netdev,  and set flags so this is skipped
 521         * on later probes
 522         */
 523        if (!rionet_check) {
 524                rio_local_read_config_32(rdev->net->hport, RIO_SRC_OPS_CAR,
 525                                         &lsrc_ops);
 526                rio_local_read_config_32(rdev->net->hport, RIO_DST_OPS_CAR,
 527                                         &ldst_ops);
 528                if (!is_rionet_capable(lsrc_ops, ldst_ops)) {
 529                        printk(KERN_ERR
 530                               "%s: local device is not network capable\n",
 531                               DRV_NAME);
 532                        rionet_check = 1;
 533                        rionet_capable = 0;
 534                        goto out;
 535                }
 536
 537                rc = rionet_setup_netdev(rdev->net->hport, ndev);
 538                rionet_check = 1;
 539                nact = 0;
 540        }
 541
 542        /*
 543         * If the remote device has mailbox/doorbell capabilities,
 544         * add it to the peer list.
 545         */
 546        if (dev_rionet_capable(rdev)) {
 547                if (!(peer = kmalloc(sizeof(struct rionet_peer), GFP_KERNEL))) {
 548                        rc = -ENOMEM;
 549                        goto out;
 550                }
 551                peer->rdev = rdev;
 552                list_add_tail(&peer->node, &rionet_peers);
 553        }
 554
 555        rio_set_drvdata(rdev, ndev);
 556
 557      out:
 558        return rc;
 559}
 560
 561static struct rio_device_id rionet_id_table[] = {
 562        {RIO_DEVICE(RIO_ANY_ID, RIO_ANY_ID)}
 563};
 564
 565static struct rio_driver rionet_driver = {
 566        .name = "rionet",
 567        .id_table = rionet_id_table,
 568        .probe = rionet_probe,
 569        .remove = rionet_remove,
 570};
 571
 572static int __init rionet_init(void)
 573{
 574        return rio_register_driver(&rionet_driver);
 575}
 576
 577static void __exit rionet_exit(void)
 578{
 579        rio_unregister_driver(&rionet_driver);
 580}
 581
 582late_initcall(rionet_init);
 583module_exit(rionet_exit);
 584
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