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