summaryrefslogtreecommitdiffstats
path: root/hw/spapr_llan.c
blob: 01e54f36757082f7f39aaf93db110a4de6660a85 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
/*
 * QEMU PowerPC pSeries Logical Partition (aka sPAPR) hardware System Emulator
 *
 * PAPR Inter-VM Logical Lan, aka ibmveth
 *
 * Copyright (c) 2010,2011 David Gibson, IBM Corporation.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 */
#include "hw.h"
#include "net.h"
#include "hw/qdev.h"
#include "hw/spapr.h"
#include "hw/spapr_vio.h"

#include <libfdt.h>

#define ETH_ALEN        6
#define MAX_PACKET_SIZE 65536

/*#define DEBUG*/

#ifdef DEBUG
#define dprintf(fmt...) do { fprintf(stderr, fmt); } while (0)
#else
#define dprintf(fmt...)
#endif

/*
 * Virtual LAN device
 */

typedef uint64_t vlan_bd_t;

#define VLAN_BD_VALID        0x8000000000000000ULL
#define VLAN_BD_TOGGLE       0x4000000000000000ULL
#define VLAN_BD_NO_CSUM      0x0200000000000000ULL
#define VLAN_BD_CSUM_GOOD    0x0100000000000000ULL
#define VLAN_BD_LEN_MASK     0x00ffffff00000000ULL
#define VLAN_BD_LEN(bd)      (((bd) & VLAN_BD_LEN_MASK) >> 32)
#define VLAN_BD_ADDR_MASK    0x00000000ffffffffULL
#define VLAN_BD_ADDR(bd)     ((bd) & VLAN_BD_ADDR_MASK)

#define VLAN_VALID_BD(addr, len) (VLAN_BD_VALID | \
                                  (((len) << 32) & VLAN_BD_LEN_MASK) |  \
                                  (addr & VLAN_BD_ADDR_MASK))

#define VLAN_RXQC_TOGGLE     0x80
#define VLAN_RXQC_VALID      0x40
#define VLAN_RXQC_NO_CSUM    0x02
#define VLAN_RXQC_CSUM_GOOD  0x01

#define VLAN_RQ_ALIGNMENT    16
#define VLAN_RXQ_BD_OFF      0
#define VLAN_FILTER_BD_OFF   8
#define VLAN_RX_BDS_OFF      16
#define VLAN_MAX_BUFS        ((SPAPR_TCE_PAGE_SIZE - VLAN_RX_BDS_OFF) / 8)

typedef struct VIOsPAPRVLANDevice {
    VIOsPAPRDevice sdev;
    NICConf nicconf;
    NICState *nic;
    int isopen;
    target_ulong buf_list;
    int add_buf_ptr, use_buf_ptr, rx_bufs;
    target_ulong rxq_ptr;
} VIOsPAPRVLANDevice;

static int spapr_vlan_can_receive(NetClientState *nc)
{
    VIOsPAPRVLANDevice *dev = DO_UPCAST(NICState, nc, nc)->opaque;

    return (dev->isopen && dev->rx_bufs > 0);
}

static ssize_t spapr_vlan_receive(NetClientState *nc, const uint8_t *buf,
                                  size_t size)
{
    VIOsPAPRDevice *sdev = DO_UPCAST(NICState, nc, nc)->opaque;
    VIOsPAPRVLANDevice *dev = (VIOsPAPRVLANDevice *)sdev;
    vlan_bd_t rxq_bd = vio_ldq(sdev, dev->buf_list + VLAN_RXQ_BD_OFF);
    vlan_bd_t bd;
    int buf_ptr = dev->use_buf_ptr;
    uint64_t handle;
    uint8_t control;

    dprintf("spapr_vlan_receive() [%s] rx_bufs=%d\n", sdev->qdev.id,
            dev->rx_bufs);

    if (!dev->isopen) {
        return -1;
    }

    if (!dev->rx_bufs) {
        return -1;
    }

    do {
        buf_ptr += 8;
        if (buf_ptr >= SPAPR_TCE_PAGE_SIZE) {
            buf_ptr = VLAN_RX_BDS_OFF;
        }

        bd = vio_ldq(sdev, dev->buf_list + buf_ptr);
        dprintf("use_buf_ptr=%d bd=0x%016llx\n",
                buf_ptr, (unsigned long long)bd);
    } while ((!(bd & VLAN_BD_VALID) || (VLAN_BD_LEN(bd) < (size + 8)))
             && (buf_ptr != dev->use_buf_ptr));

    if (!(bd & VLAN_BD_VALID) || (VLAN_BD_LEN(bd) < (size + 8))) {
        /* Failed to find a suitable buffer */
        return -1;
    }

    /* Remove the buffer from the pool */
    dev->rx_bufs--;
    dev->use_buf_ptr = buf_ptr;
    vio_stq(sdev, dev->buf_list + dev->use_buf_ptr, 0);

    dprintf("Found buffer: ptr=%d num=%d\n", dev->use_buf_ptr, dev->rx_bufs);

    /* Transfer the packet data */
    if (spapr_vio_dma_write(sdev, VLAN_BD_ADDR(bd) + 8, buf, size) < 0) {
        return -1;
    }

    dprintf("spapr_vlan_receive: DMA write completed\n");

    /* Update the receive queue */
    control = VLAN_RXQC_TOGGLE | VLAN_RXQC_VALID;
    if (rxq_bd & VLAN_BD_TOGGLE) {
        control ^= VLAN_RXQC_TOGGLE;
    }

    handle = vio_ldq(sdev, VLAN_BD_ADDR(bd));
    vio_stq(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr + 8, handle);
    vio_stl(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr + 4, size);
    vio_sth(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr + 2, 8);
    vio_stb(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr, control);

    dprintf("wrote rxq entry (ptr=0x%llx): 0x%016llx 0x%016llx\n",
            (unsigned long long)dev->rxq_ptr,
            (unsigned long long)vio_ldq(sdev, VLAN_BD_ADDR(rxq_bd) +
                                        dev->rxq_ptr),
            (unsigned long long)vio_ldq(sdev, VLAN_BD_ADDR(rxq_bd) +
                                        dev->rxq_ptr + 8));

    dev->rxq_ptr += 16;
    if (dev->rxq_ptr >= VLAN_BD_LEN(rxq_bd)) {
        dev->rxq_ptr = 0;
        vio_stq(sdev, dev->buf_list + VLAN_RXQ_BD_OFF, rxq_bd ^ VLAN_BD_TOGGLE);
    }

    if (sdev->signal_state & 1) {
        qemu_irq_pulse(sdev->qirq);
    }

    return size;
}

static NetClientInfo net_spapr_vlan_info = {
    .type = NET_CLIENT_OPTIONS_KIND_NIC,
    .size = sizeof(NICState),
    .can_receive = spapr_vlan_can_receive,
    .receive = spapr_vlan_receive,
};

static void spapr_vlan_reset(VIOsPAPRDevice *sdev)
{
    VIOsPAPRVLANDevice *dev = DO_UPCAST(VIOsPAPRVLANDevice, sdev, sdev);

    dev->buf_list = 0;
    dev->rx_bufs = 0;
    dev->isopen = 0;
}

static int spapr_vlan_init(VIOsPAPRDevice *sdev)
{
    VIOsPAPRVLANDevice *dev = (VIOsPAPRVLANDevice *)sdev;

    qemu_macaddr_default_if_unset(&dev->nicconf.macaddr);

    dev->nic = qemu_new_nic(&net_spapr_vlan_info, &dev->nicconf,
                            object_get_typename(OBJECT(sdev)), sdev->qdev.id, dev);
    qemu_format_nic_info_str(&dev->nic->nc, dev->nicconf.macaddr.a);

    return 0;
}

void spapr_vlan_create(VIOsPAPRBus *bus, NICInfo *nd)
{
    DeviceState *dev;

    dev = qdev_create(&bus->bus, "spapr-vlan");

    qdev_set_nic_properties(dev, nd);

    qdev_init_nofail(dev);
}

static int spapr_vlan_devnode(VIOsPAPRDevice *dev, void *fdt, int node_off)
{
    VIOsPAPRVLANDevice *vdev = (VIOsPAPRVLANDevice *)dev;
    uint8_t padded_mac[8] = {0, 0};
    int ret;

    /* Some old phyp versions give the mac address in an 8-byte
     * property.  The kernel driver has an insane workaround for this;
     * rather than doing the obvious thing and checking the property
     * length, it checks whether the first byte has 0b10 in the low
     * bits.  If a correct 6-byte property has a different first byte
     * the kernel will get the wrong mac address, overrunning its
     * buffer in the process (read only, thank goodness).
     *
     * Here we workaround the kernel workaround by always supplying an
     * 8-byte property, with the mac address in the last six bytes */
    memcpy(&padded_mac[2], &vdev->nicconf.macaddr, ETH_ALEN);
    ret = fdt_setprop(fdt, node_off, "local-mac-address",
                      padded_mac, sizeof(padded_mac));
    if (ret < 0) {
        return ret;
    }

    ret = fdt_setprop_cell(fdt, node_off, "ibm,mac-address-filters", 0);
    if (ret < 0) {
        return ret;
    }

    return 0;
}

static int check_bd(VIOsPAPRVLANDevice *dev, vlan_bd_t bd,
                    target_ulong alignment)
{
    if ((VLAN_BD_ADDR(bd) % alignment)
        || (VLAN_BD_LEN(bd) % alignment)) {
        return -1;
    }

    if (!spapr_vio_dma_valid(&dev->sdev, VLAN_BD_ADDR(bd),
                             VLAN_BD_LEN(bd), DMA_DIRECTION_FROM_DEVICE)
        || !spapr_vio_dma_valid(&dev->sdev, VLAN_BD_ADDR(bd),
                                VLAN_BD_LEN(bd), DMA_DIRECTION_TO_DEVICE)) {
        return -1;
    }

    return 0;
}

static target_ulong h_register_logical_lan(CPUPPCState *env,
                                           sPAPREnvironment *spapr,
                                           target_ulong opcode,
                                           target_ulong *args)
{
    target_ulong reg = args[0];
    target_ulong buf_list = args[1];
    target_ulong rec_queue = args[2];
    target_ulong filter_list = args[3];
    VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
    VIOsPAPRVLANDevice *dev = (VIOsPAPRVLANDevice *)sdev;
    vlan_bd_t filter_list_bd;

    if (!dev) {
        return H_PARAMETER;
    }

    if (dev->isopen) {
        hcall_dprintf("H_REGISTER_LOGICAL_LAN called twice without "
                      "H_FREE_LOGICAL_LAN\n");
        return H_RESOURCE;
    }

    if (check_bd(dev, VLAN_VALID_BD(buf_list, SPAPR_TCE_PAGE_SIZE),
                 SPAPR_TCE_PAGE_SIZE) < 0) {
        hcall_dprintf("Bad buf_list 0x" TARGET_FMT_lx "\n", buf_list);
        return H_PARAMETER;
    }

    filter_list_bd = VLAN_VALID_BD(filter_list, SPAPR_TCE_PAGE_SIZE);
    if (check_bd(dev, filter_list_bd, SPAPR_TCE_PAGE_SIZE) < 0) {
        hcall_dprintf("Bad filter_list 0x" TARGET_FMT_lx "\n", filter_list);
        return H_PARAMETER;
    }

    if (!(rec_queue & VLAN_BD_VALID)
        || (check_bd(dev, rec_queue, VLAN_RQ_ALIGNMENT) < 0)) {
        hcall_dprintf("Bad receive queue\n");
        return H_PARAMETER;
    }

    dev->buf_list = buf_list;
    sdev->signal_state = 0;

    rec_queue &= ~VLAN_BD_TOGGLE;

    /* Initialize the buffer list */
    vio_stq(sdev, buf_list, rec_queue);
    vio_stq(sdev, buf_list + 8, filter_list_bd);
    spapr_vio_dma_set(sdev, buf_list + VLAN_RX_BDS_OFF, 0,
                      SPAPR_TCE_PAGE_SIZE - VLAN_RX_BDS_OFF);
    dev->add_buf_ptr = VLAN_RX_BDS_OFF - 8;
    dev->use_buf_ptr = VLAN_RX_BDS_OFF - 8;
    dev->rx_bufs = 0;
    dev->rxq_ptr = 0;

    /* Initialize the receive queue */
    spapr_vio_dma_set(sdev, VLAN_BD_ADDR(rec_queue), 0, VLAN_BD_LEN(rec_queue));

    dev->isopen = 1;
    return H_SUCCESS;
}


static target_ulong h_free_logical_lan(CPUPPCState *env, sPAPREnvironment *spapr,
                                       target_ulong opcode, target_ulong *args)
{
    target_ulong reg = args[0];
    VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
    VIOsPAPRVLANDevice *dev = (VIOsPAPRVLANDevice *)sdev;

    if (!dev) {
        return H_PARAMETER;
    }

    if (!dev->isopen) {
        hcall_dprintf("H_FREE_LOGICAL_LAN called without "
                      "H_REGISTER_LOGICAL_LAN\n");
        return H_RESOURCE;
    }

    spapr_vlan_reset(sdev);
    return H_SUCCESS;
}

static target_ulong h_add_logical_lan_buffer(CPUPPCState *env,
                                             sPAPREnvironment *spapr,
                                             target_ulong opcode,
                                             target_ulong *args)
{
    target_ulong reg = args[0];
    target_ulong buf = args[1];
    VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
    VIOsPAPRVLANDevice *dev = (VIOsPAPRVLANDevice *)sdev;
    vlan_bd_t bd;

    dprintf("H_ADD_LOGICAL_LAN_BUFFER(0x" TARGET_FMT_lx
            ", 0x" TARGET_FMT_lx ")\n", reg, buf);

    if (!sdev) {
        hcall_dprintf("Bad device\n");
        return H_PARAMETER;
    }

    if ((check_bd(dev, buf, 4) < 0)
        || (VLAN_BD_LEN(buf) < 16)) {
        hcall_dprintf("Bad buffer enqueued\n");
        return H_PARAMETER;
    }

    if (!dev->isopen || dev->rx_bufs >= VLAN_MAX_BUFS) {
        return H_RESOURCE;
    }

    do {
        dev->add_buf_ptr += 8;
        if (dev->add_buf_ptr >= SPAPR_TCE_PAGE_SIZE) {
            dev->add_buf_ptr = VLAN_RX_BDS_OFF;
        }

        bd = vio_ldq(sdev, dev->buf_list + dev->add_buf_ptr);
    } while (bd & VLAN_BD_VALID);

    vio_stq(sdev, dev->buf_list + dev->add_buf_ptr, buf);

    dev->rx_bufs++;

    dprintf("h_add_logical_lan_buffer():  Added buf  ptr=%d  rx_bufs=%d"
            " bd=0x%016llx\n", dev->add_buf_ptr, dev->rx_bufs,
            (unsigned long long)buf);

    return H_SUCCESS;
}

static target_ulong h_send_logical_lan(CPUPPCState *env, sPAPREnvironment *spapr,
                                       target_ulong opcode, target_ulong *args)
{
    target_ulong reg = args[0];
    target_ulong *bufs = args + 1;
    target_ulong continue_token = args[7];
    VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
    VIOsPAPRVLANDevice *dev = (VIOsPAPRVLANDevice *)sdev;
    unsigned total_len;
    uint8_t *lbuf, *p;
    int i, nbufs;
    int ret;

    dprintf("H_SEND_LOGICAL_LAN(0x" TARGET_FMT_lx ", <bufs>, 0x"
            TARGET_FMT_lx ")\n", reg, continue_token);

    if (!sdev) {
        return H_PARAMETER;
    }

    dprintf("rxbufs = %d\n", dev->rx_bufs);

    if (!dev->isopen) {
        return H_DROPPED;
    }

    if (continue_token) {
        return H_HARDWARE; /* FIXME actually handle this */
    }

    total_len = 0;
    for (i = 0; i < 6; i++) {
        dprintf("   buf desc: 0x" TARGET_FMT_lx "\n", bufs[i]);
        if (!(bufs[i] & VLAN_BD_VALID)) {
            break;
        }
        total_len += VLAN_BD_LEN(bufs[i]);
    }

    nbufs = i;
    dprintf("h_send_logical_lan() %d buffers, total length 0x%x\n",
            nbufs, total_len);

    if (total_len == 0) {
        return H_SUCCESS;
    }

    if (total_len > MAX_PACKET_SIZE) {
        /* Don't let the guest force too large an allocation */
        return H_RESOURCE;
    }

    lbuf = alloca(total_len);
    p = lbuf;
    for (i = 0; i < nbufs; i++) {
        ret = spapr_vio_dma_read(sdev, VLAN_BD_ADDR(bufs[i]),
                                 p, VLAN_BD_LEN(bufs[i]));
        if (ret < 0) {
            return ret;
        }

        p += VLAN_BD_LEN(bufs[i]);
    }

    qemu_send_packet(&dev->nic->nc, lbuf, total_len);

    return H_SUCCESS;
}

static target_ulong h_multicast_ctrl(CPUPPCState *env, sPAPREnvironment *spapr,
                                     target_ulong opcode, target_ulong *args)
{
    target_ulong reg = args[0];
    VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);

    if (!dev) {
        return H_PARAMETER;
    }

    return H_SUCCESS;
}

static Property spapr_vlan_properties[] = {
    DEFINE_SPAPR_PROPERTIES(VIOsPAPRVLANDevice, sdev),
    DEFINE_NIC_PROPERTIES(VIOsPAPRVLANDevice, nicconf),
    DEFINE_PROP_END_OF_LIST(),
};

static void spapr_vlan_class_init(ObjectClass *klass, void *data)
{
    DeviceClass *dc = DEVICE_CLASS(klass);
    VIOsPAPRDeviceClass *k = VIO_SPAPR_DEVICE_CLASS(klass);

    k->init = spapr_vlan_init;
    k->reset = spapr_vlan_reset;
    k->devnode = spapr_vlan_devnode;
    k->dt_name = "l-lan";
    k->dt_type = "network";
    k->dt_compatible = "IBM,l-lan";
    k->signal_mask = 0x1;
    dc->props = spapr_vlan_properties;
    k->rtce_window_size = 0x10000000;
}

static TypeInfo spapr_vlan_info = {
    .name          = "spapr-vlan",
    .parent        = TYPE_VIO_SPAPR_DEVICE,
    .instance_size = sizeof(VIOsPAPRVLANDevice),
    .class_init    = spapr_vlan_class_init,
};

static void spapr_vlan_register_types(void)
{
    spapr_register_hypercall(H_REGISTER_LOGICAL_LAN, h_register_logical_lan);
    spapr_register_hypercall(H_FREE_LOGICAL_LAN, h_free_logical_lan);
    spapr_register_hypercall(H_SEND_LOGICAL_LAN, h_send_logical_lan);
    spapr_register_hypercall(H_ADD_LOGICAL_LAN_BUFFER,
                             h_add_logical_lan_buffer);
    spapr_register_hypercall(H_MULTICAST_CTRL, h_multicast_ctrl);
    type_register_static(&spapr_vlan_info);
}

type_init(spapr_vlan_register_types)
OpenPOWER on IntegriCloud