summaryrefslogtreecommitdiff
path: root/src/dev/virtio/fs9p.cc
blob: 7857feafc373cd47a0da6b74ca7fb8413d3fee3e (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
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
/*
 * Copyright (c) 2014-2017 ARM Limited
 * All rights reserved
 *
 * The license below extends only to copyright in the software and shall
 * not be construed as granting a license to any other intellectual
 * property including but not limited to intellectual property relating
 * to a hardware implementation of the functionality of the software
 * licensed hereunder.  You may use the software subject to the license
 * terms below provided that you ensure that this notice is replicated
 * unmodified and in its entirety in all distributions of the software,
 * modified or unmodified, in source code or in binary form.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met: redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer;
 * redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution;
 * neither the name of the copyright holders nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Authors: Andreas Sandberg
 */

#include "dev/virtio/fs9p.hh"

#include <fcntl.h>
#include <netdb.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/un.h>
#include <sys/wait.h>
#include <unistd.h>

#include <csignal>
#include <fstream>

#include "base/callback.hh"
#include "base/output.hh"
#include "debug/VIO9P.hh"
#include "debug/VIO9PData.hh"
#include "params/VirtIO9PBase.hh"
#include "params/VirtIO9PDiod.hh"
#include "params/VirtIO9PProxy.hh"
#include "params/VirtIO9PSocket.hh"
#include "sim/system.hh"

struct P9MsgInfo {
    P9MsgInfo(P9MsgType _type, std::string _name)
        : type(_type), name(_name) {}

    P9MsgType type;
    std::string name;
};

typedef std::map<P9MsgType, P9MsgInfo> P9MsgInfoMap;

#define P9MSG(type, name)                               \
    { (type), P9MsgInfo((type), "T" # name ) },         \
    { (type + 1), P9MsgInfo((type + 1), "R" # name ) }

static const P9MsgInfoMap p9_msg_info {
    P9MSG(6, LERROR),
    P9MSG(8, STATFS),
    P9MSG(12, LOPEN),
    P9MSG(14, LCREATE),
    P9MSG(16, SYMLINK),
    P9MSG(18, MKNOD),
    P9MSG(20, RENAME),
    P9MSG(22, READLINK),
    P9MSG(24, GETATTR),
    P9MSG(26, SETATTR),
    P9MSG(30, XATTRWALK),
    P9MSG(32, XATTRCREATE),
    P9MSG(40, READDIR),
    P9MSG(50, FSYNC),
    P9MSG(52, LOCK),
    P9MSG(54, GETLOCK),
    P9MSG(70, LINK),
    P9MSG(72, MKDIR),
    P9MSG(74, RENAMEAT),
    P9MSG(76, UNLINKAT),
    P9MSG(100, VERSION),
    P9MSG(102, AUTH),
    P9MSG(104, ATTACH),
    P9MSG(106, ERROR),
    P9MSG(108, FLUSH),
    P9MSG(110, WALK),
    P9MSG(112, OPEN),
    P9MSG(114, CREATE),
    P9MSG(116, READ),
    P9MSG(118, WRITE),
    P9MSG(120, CLUNK),
    P9MSG(122, REMOVE),
    P9MSG(124, STAT),
    P9MSG(126, WSTAT),
};

#undef P9MSG

VirtIO9PBase::VirtIO9PBase(Params *params)
    : VirtIODeviceBase(params, ID_9P,
                       sizeof(Config) + params->tag.size(),
                       F_MOUNT_TAG),
      queue(params->system->physProxy, params->queueSize, *this)
{
    config.reset((Config *)
                 operator new(configSize));
    config->len = htov_legacy(params->tag.size());
    memcpy(config->tag, params->tag.c_str(), params->tag.size());

    registerQueue(queue);
}


VirtIO9PBase::~VirtIO9PBase()
{
}

void
VirtIO9PBase::readConfig(PacketPtr pkt, Addr cfgOffset)
{
    readConfigBlob(pkt, cfgOffset, (uint8_t *)config.get());
}

void
VirtIO9PBase::FSQueue::onNotifyDescriptor(VirtDescriptor *desc)
{
    DPRINTF(VIO9P, "Got input data descriptor (len: %i)\n", desc->size());
    DPRINTF(VIO9P, "\tPending transactions: %i\n", parent.pendingTransactions.size());

    P9MsgHeader header;
    desc->chainRead(0, (uint8_t *)&header, sizeof(header));
    header = p9toh(header);

    uint8_t data[header.len - sizeof(header)];
    desc->chainRead(sizeof(header), data, sizeof(data));

    // Keep track of pending transactions
    parent.pendingTransactions[header.tag] = desc;

    DPRINTF(VIO9P, "recvTMsg\n");
    parent.dumpMsg(header, data, sizeof(data));

    // Notify device of message
    parent.recvTMsg(header, data, sizeof(data));
}

void
VirtIO9PBase::sendRMsg(const P9MsgHeader &header, const uint8_t *data, size_t size)
{
    DPRINTF(VIO9P, "Sending RMsg\n");
    dumpMsg(header, data, size);
    DPRINTF(VIO9P, "\tPending transactions: %i\n", pendingTransactions.size());
    assert(header.len >= sizeof(header));

    VirtDescriptor *main_desc(pendingTransactions[header.tag]);
    pendingTransactions.erase(header.tag);

    // Find the first output descriptor
    VirtDescriptor *out_desc(main_desc);
    while (out_desc && !out_desc->isOutgoing())
        out_desc = out_desc->next();
    if (!out_desc)
        panic("sendRMsg: Framing error, no output descriptor.\n");

    P9MsgHeader header_out(htop9(header));
    header_out.len = htop9(sizeof(P9MsgHeader) + size);

    out_desc->chainWrite(0, (uint8_t *)&header_out, sizeof(header_out));
    out_desc->chainWrite(sizeof(header_out), data, size);

    queue.produceDescriptor(main_desc, sizeof(P9MsgHeader) + size);
    kick();
}

void
VirtIO9PBase::dumpMsg(const P9MsgHeader &header, const uint8_t *data, size_t size)
{
#ifndef NDEBUG
    if (!DTRACE(VIO9P))
        return;

    const P9MsgInfoMap::const_iterator it_msg(p9_msg_info.find(header.type));
    if (it_msg != p9_msg_info.cend()) {
        const P9MsgInfo &info(it_msg->second);
        DPRINTF(VIO9P, "P9Msg[len = %i, type = %s (%i), tag = %i]\n",
                header.len, info.name, header.type, header.tag);
    } else {
        DPRINTF(VIO9P, "P9Msg[len = %i, type = Unknown (%i), tag = %i]\n",
                header.len, header.type, header.tag);
    }
    DDUMP(VIO9PData, data, size);
#endif
}


VirtIO9PProxy::VirtIO9PProxy(Params *params)
  : VirtIO9PBase(params), deviceUsed(false)
{
}

VirtIO9PProxy::~VirtIO9PProxy()
{
}


void
VirtIO9PProxy::serialize(CheckpointOut &cp) const
{
    if (deviceUsed) {
        warn("Serializing VirtIO9Base device after device has been used. It is "
             "likely that state will be lost, and that the device will cease "
             "to work!");
    }
    SERIALIZE_SCALAR(deviceUsed);

    VirtIO9PBase::serialize(cp);
}

void
VirtIO9PProxy::unserialize(CheckpointIn &cp)
{
    UNSERIALIZE_SCALAR(deviceUsed);

    if (deviceUsed) {
        warn("Unserializing VirtIO9Base device after device has been used. It is "
             "likely that state has been lost, and that the device will cease "
             "to work!");
    }
    VirtIO9PBase::unserialize(cp);
}


void
VirtIO9PProxy::recvTMsg(const P9MsgHeader &header,
                        const uint8_t *data, size_t size)
{
    deviceUsed = true;
    assert(header.len == sizeof(header) + size);
    // While technically not needed, we send the packet as one
    // contiguous segment to make some packet dissectors happy.
    uint8_t out[header.len];
    P9MsgHeader header_out(htop9(header));
    memcpy(out, (uint8_t *)&header_out, sizeof(header_out));
    memcpy(out + sizeof(header_out), data, size);
    writeAll(out, sizeof(header_out) + size);
}

void
VirtIO9PProxy::serverDataReady()
{
    P9MsgHeader header;
    readAll((uint8_t *)&header, sizeof(header));
    header = p9toh(header);

    const ssize_t payload_len(header.len - sizeof(header));
    if (payload_len < 0)
        panic("Payload length is negative!\n");
    uint8_t data[payload_len];
    readAll(data, payload_len);

    sendRMsg(header, data, payload_len);
}


void
VirtIO9PProxy::readAll(uint8_t *data, size_t len)
{
    while (len) {
        ssize_t ret;
        while ((ret = read(data, len)) == -EAGAIN)
            ;
        if (ret < 0)
            panic("readAll: Read failed: %i\n", -ret);

        len -= ret;
        data += ret;
    }
}

void
VirtIO9PProxy::writeAll(const uint8_t *data, size_t len)
{
    while (len) {
        ssize_t ret;
        while ((ret = write(data, len)) == -EAGAIN)
            ;
        if (ret < 0)
            panic("writeAll: write failed: %i\n", -ret);

        len -= ret;
        data += ret;
    }
}



VirtIO9PDiod::VirtIO9PDiod(Params *params)
    : VirtIO9PProxy(params),
      fd_to_diod(-1), fd_from_diod(-1), diod_pid(-1)
{
    // Register an exit callback so we can kill the diod process
    Callback* cb = new MakeCallback<VirtIO9PDiod,
                                    &VirtIO9PDiod::terminateDiod>(this);
    registerExitCallback(cb);
}

VirtIO9PDiod::~VirtIO9PDiod()
{
}

void
VirtIO9PDiod::startup()
{
    startDiod();
    dataEvent.reset(new DiodDataEvent(*this, fd_from_diod, POLLIN));
    pollQueue.schedule(dataEvent.get());
}

void
VirtIO9PDiod::startDiod()
{
    const Params *p(dynamic_cast<const Params *>(params()));
    int pipe_rfd[2];
    int pipe_wfd[2];
    const int DIOD_RFD = 3;
    const int DIOD_WFD = 4;

    const char *diod(p->diod.c_str());

    DPRINTF(VIO9P, "Using diod at %s \n", p->diod.c_str());

    if (pipe(pipe_rfd) == -1 || pipe(pipe_wfd) == -1)
        panic("Failed to create DIOD pipes: %i\n", errno);

    fd_to_diod = pipe_rfd[1];
    fd_from_diod = pipe_wfd[0];

    // Create Unix domain socket
    int socket_id = socket(AF_UNIX, SOCK_STREAM, 0);
    if (socket_id == -1) {
        panic("Socket creation failed %i \n", errno);
    }
    // Bind the socket to a path which will not be read
    struct sockaddr_un socket_address;
    memset(&socket_address, 0, sizeof(struct sockaddr_un));
    socket_address.sun_family = AF_UNIX;

    const std::string socket_path = simout.resolve(p->socketPath);
    fatal_if(!OutputDirectory::isAbsolute(socket_path), "Please make the" \
             " output directory an absolute path, else diod will fail!\n");

    // Prevent overflow in strcpy
    fatal_if(sizeof(socket_address.sun_path) <= socket_path.length(),
             "Incorrect length of socket path");
    strncpy(socket_address.sun_path, socket_path.c_str(),
            sizeof(socket_address.sun_path) - 1);
    if (bind(socket_id, (struct sockaddr*) &socket_address,
             sizeof(struct sockaddr_un)) == -1){
        perror("Socket binding");
        panic("Socket binding to %i failed - most likely the output dir" \
              " and hence unused socket already exists \n", socket_id);
    }

    diod_pid = fork();
    if (diod_pid == -1) {
        panic("Fork failed: %i\n", errno);
    } else if (diod_pid == 0) {
        // Create the socket which will later by used by the diod process
        close(STDIN_FILENO);
        if (dup2(pipe_rfd[0], DIOD_RFD) == -1 ||
            dup2(pipe_wfd[1], DIOD_WFD) == -1) {

            panic("Failed to setup read/write pipes: %i\n",
                  errno);
        }

        // Start diod
        execlp(diod, diod,
               "-f", // start in foreground
               "-r", "3", // setup read FD
               "-w", "4", // setup write FD
               "-e", p->root.c_str(), // path to export
               "-n", // disable security
               "-S", // squash all users
               "-l", socket_path.c_str(), // pass the socket
               (char *)NULL);
        perror("Starting DIOD");
        panic("Failed to execute diod to %s: %i\n",socket_path, errno);
    } else {
        close(pipe_rfd[0]);
        close(pipe_wfd[1]);
        inform("Started diod with PID %u, you might need to manually kill " \
                " diod if gem5 crashes \n", diod_pid);
    }

#undef DIOD_RFD
#undef DIOD_WFD
}

ssize_t
VirtIO9PDiod::read(uint8_t *data, size_t len)
{
    assert(fd_from_diod != -1);
    const int ret(::read(fd_from_diod, (void *)data, len));
    return ret < 0 ? -errno : ret;
}

ssize_t
VirtIO9PDiod::write(const uint8_t *data, size_t len)
{
    assert(fd_to_diod != -1);
    const int ret(::write(fd_to_diod, (const void *)data, len));
    return ret < 0 ? -errno : ret;
}

void
VirtIO9PDiod::DiodDataEvent::process(int revent)
{
    parent.serverDataReady();
}

void
VirtIO9PDiod::terminateDiod()
{
    assert(diod_pid != -1);

    DPRINTF(VIO9P, "Trying to kill diod at pid %u \n", diod_pid);

    if (kill(diod_pid, SIGTERM) != 0) {
        perror("Killing diod process");
        warn("Failed to kill diod using SIGTERM");
        return;
    }

    // Check if kill worked
    for (unsigned i = 0; i < 5; i++) {
        int wait_return = waitpid(diod_pid, NULL, WNOHANG);
        if (wait_return == diod_pid) {
            // Managed to kill diod
            return;
        } else if (wait_return == 0) {
            // Diod is not killed so sleep and try again
            usleep(500);
        } else {
            // Failed in waitpid
            perror("Waitpid");
            warn("Failed in waitpid");
        }
    }

    // Try again to kill diod with sigkill
    inform("Trying to kill diod with SIGKILL as SIGTERM failed \n");
    if (kill(diod_pid, SIGKILL) != 0) {
        perror("Killing diod process");
        warn("Failed to kill diod using SIGKILL");
    } else {
        // Managed to kill diod
        return;
    }

}
VirtIO9PDiod *
VirtIO9PDiodParams::create()
{
    return new VirtIO9PDiod(this);
}




VirtIO9PSocket::VirtIO9PSocket(Params *params)
    : VirtIO9PProxy(params), fdSocket(-1)
{
}

VirtIO9PSocket::~VirtIO9PSocket()
{
}

void
VirtIO9PSocket::startup()
{
    connectSocket();
    dataEvent.reset(new SocketDataEvent(*this, fdSocket, POLLIN));
    pollQueue.schedule(dataEvent.get());
}

void
VirtIO9PSocket::connectSocket()
{
    const Params &p(dynamic_cast<const Params &>(*params()));

    int ret;
    struct addrinfo hints, *result;
    memset(&hints, 0, sizeof(hints));
    hints.ai_family = AF_UNSPEC;
    hints.ai_socktype = SOCK_STREAM;
    hints.ai_flags = 0;
    hints.ai_protocol = 0;

    if ((ret = getaddrinfo(p.server.c_str(), p.port.c_str(),
                           &hints, &result)) != 0)
        panic("getaddrinfo: %s\n", gai_strerror(ret));

    DPRINTF(VIO9P, "Connecting to 9p server '%s'.\n", p.server);
    for (struct addrinfo *rp = result; rp; rp = rp->ai_next) {
        fdSocket = socket(rp->ai_family, rp->ai_socktype,
                     rp->ai_protocol);
        if (fdSocket == -1) {
            continue;
        } else if (connect(fdSocket, rp->ai_addr, rp->ai_addrlen) != -1) {
            break;
        } else {
            close(fdSocket);
            fdSocket = -1;
        }
    }

    freeaddrinfo(result);

    if (fdSocket == -1)
        panic("Failed to connect to 9p server (%s:%s)", p.server, p.port);
}

void
VirtIO9PSocket::socketDisconnect()
{
    panic("9P Socket disconnected!\n");
}

ssize_t
VirtIO9PSocket::read(uint8_t *data, size_t len)
{
    assert(fdSocket != -1);
    int ret;

    ret = ::recv(fdSocket, (void *)data, len, 0);
    if (ret == 0)
        socketDisconnect();

    return ret < 0 ? -errno : ret;
}

ssize_t
VirtIO9PSocket::write(const uint8_t *data, size_t len)
{
    assert(fdSocket != -1);
    int ret(::send(fdSocket, (const void *)data, len, 0));
    return ret < 0 ? -errno : ret;
}

void
VirtIO9PSocket::SocketDataEvent::process(int revent)
{
    parent.serverDataReady();
}


VirtIO9PSocket *
VirtIO9PSocketParams::create()
{
    return new VirtIO9PSocket(this);
}