1 /*
2 * QEMU PowerPC pSeries Logical Partition (aka sPAPR) hardware System Emulator
3 *
4 * PAPR Inter-VM Logical Lan, aka ibmveth
5 *
6 * Copyright (c) 2010,2011 David Gibson, IBM Corporation.
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a copy
9 * of this software and associated documentation files (the "Software"), to deal
10 * in the Software without restriction, including without limitation the rights
11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
12 * copies of the Software, and to permit persons to whom the Software is
13 * furnished to do so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice shall be included in
16 * all copies or substantial portions of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
21 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
24 * THE SOFTWARE.
25 *
26 */
27
28 #include "qemu/osdep.h"
29 #include "qemu/log.h"
30 #include "qemu/module.h"
31 #include "net/net.h"
32 #include "migration/vmstate.h"
33 #include "hw/ppc/spapr.h"
34 #include "hw/ppc/spapr_vio.h"
35 #include "hw/qdev-properties.h"
36 #include "sysemu/sysemu.h"
37 #include "trace.h"
38
39 #include <libfdt.h>
40 #include "qom/object.h"
41
42 #define ETH_ALEN 6
43 #define MAX_PACKET_SIZE 65536
44
45 /* Compatibility flags for migration */
46 #define SPAPRVLAN_FLAG_RX_BUF_POOLS_BIT 0
47 #define SPAPRVLAN_FLAG_RX_BUF_POOLS (1 << SPAPRVLAN_FLAG_RX_BUF_POOLS_BIT)
48
49 /*
50 * Virtual LAN device
51 */
52
53 typedef uint64_t vlan_bd_t;
54
55 #define VLAN_BD_VALID 0x8000000000000000ULL
56 #define VLAN_BD_TOGGLE 0x4000000000000000ULL
57 #define VLAN_BD_NO_CSUM 0x0200000000000000ULL
58 #define VLAN_BD_CSUM_GOOD 0x0100000000000000ULL
59 #define VLAN_BD_LEN_MASK 0x00ffffff00000000ULL
60 #define VLAN_BD_LEN(bd) (((bd) & VLAN_BD_LEN_MASK) >> 32)
61 #define VLAN_BD_ADDR_MASK 0x00000000ffffffffULL
62 #define VLAN_BD_ADDR(bd) ((bd) & VLAN_BD_ADDR_MASK)
63
64 #define VLAN_VALID_BD(addr, len) (VLAN_BD_VALID | \
65 (((len) << 32) & VLAN_BD_LEN_MASK) | \
66 (addr & VLAN_BD_ADDR_MASK))
67
68 #define VLAN_RXQC_TOGGLE 0x80
69 #define VLAN_RXQC_VALID 0x40
70 #define VLAN_RXQC_NO_CSUM 0x02
71 #define VLAN_RXQC_CSUM_GOOD 0x01
72
73 #define VLAN_RQ_ALIGNMENT 16
74 #define VLAN_RXQ_BD_OFF 0
75 #define VLAN_FILTER_BD_OFF 8
76 #define VLAN_RX_BDS_OFF 16
77 /*
78 * The final 8 bytes of the buffer list is a counter of frames dropped
79 * because there was not a buffer in the buffer list capable of holding
80 * the frame. We must avoid it, or the operating system will report garbage
81 * for this statistic.
82 */
83 #define VLAN_RX_BDS_LEN (SPAPR_TCE_PAGE_SIZE - VLAN_RX_BDS_OFF - 8)
84 #define VLAN_MAX_BUFS (VLAN_RX_BDS_LEN / 8)
85
86 #define TYPE_VIO_SPAPR_VLAN_DEVICE "spapr-vlan"
87 OBJECT_DECLARE_SIMPLE_TYPE(SpaprVioVlan, VIO_SPAPR_VLAN_DEVICE)
88
89 #define RX_POOL_MAX_BDS 4096
90 #define RX_MAX_POOLS 5
91
92 typedef struct {
93 int32_t bufsize;
94 int32_t count;
95 vlan_bd_t bds[RX_POOL_MAX_BDS];
96 } RxBufPool;
97
98 struct SpaprVioVlan {
99 SpaprVioDevice sdev;
100 NICConf nicconf;
101 NICState *nic;
102 MACAddr perm_mac;
103 bool isopen;
104 hwaddr buf_list;
105 uint32_t add_buf_ptr, use_buf_ptr, rx_bufs;
106 hwaddr rxq_ptr;
107 QEMUTimer *rxp_timer;
108 uint32_t compat_flags; /* Compatibility flags for migration */
109 RxBufPool *rx_pool[RX_MAX_POOLS]; /* Receive buffer descriptor pools */
110 };
111
spapr_vlan_can_receive(NetClientState * nc)112 static bool spapr_vlan_can_receive(NetClientState *nc)
113 {
114 SpaprVioVlan *dev = qemu_get_nic_opaque(nc);
115
116 return dev->isopen && dev->rx_bufs > 0;
117 }
118
119 /**
120 * The last 8 bytes of the receive buffer list page (that has been
121 * supplied by the guest with the H_REGISTER_LOGICAL_LAN call) contain
122 * a counter for frames that have been dropped because there was no
123 * suitable receive buffer available. This function is used to increase
124 * this counter by one.
125 */
spapr_vlan_record_dropped_rx_frame(SpaprVioVlan * dev)126 static void spapr_vlan_record_dropped_rx_frame(SpaprVioVlan *dev)
127 {
128 uint64_t cnt;
129
130 cnt = vio_ldq(&dev->sdev, dev->buf_list + 4096 - 8);
131 vio_stq(&dev->sdev, dev->buf_list + 4096 - 8, cnt + 1);
132 }
133
134 /**
135 * Get buffer descriptor from one of our receive buffer pools
136 */
spapr_vlan_get_rx_bd_from_pool(SpaprVioVlan * dev,size_t size)137 static vlan_bd_t spapr_vlan_get_rx_bd_from_pool(SpaprVioVlan *dev,
138 size_t size)
139 {
140 vlan_bd_t bd;
141 int pool;
142
143 for (pool = 0; pool < RX_MAX_POOLS; pool++) {
144 if (dev->rx_pool[pool]->count > 0 &&
145 dev->rx_pool[pool]->bufsize >= size + 8) {
146 break;
147 }
148 }
149 if (pool == RX_MAX_POOLS) {
150 /* Failed to find a suitable buffer */
151 return 0;
152 }
153
154
155 trace_spapr_vlan_get_rx_bd_from_pool_found(pool,
156 dev->rx_pool[pool]->count,
157 dev->rx_bufs);
158
159 /* Remove the buffer from the pool */
160 dev->rx_pool[pool]->count--;
161 bd = dev->rx_pool[pool]->bds[dev->rx_pool[pool]->count];
162 dev->rx_pool[pool]->bds[dev->rx_pool[pool]->count] = 0;
163
164 return bd;
165 }
166
167 /**
168 * Get buffer descriptor from the receive buffer list page that has been
169 * supplied by the guest with the H_REGISTER_LOGICAL_LAN call
170 */
spapr_vlan_get_rx_bd_from_page(SpaprVioVlan * dev,size_t size)171 static vlan_bd_t spapr_vlan_get_rx_bd_from_page(SpaprVioVlan *dev,
172 size_t size)
173 {
174 int buf_ptr = dev->use_buf_ptr;
175 vlan_bd_t bd;
176
177 do {
178 buf_ptr += 8;
179 if (buf_ptr >= VLAN_RX_BDS_LEN + VLAN_RX_BDS_OFF) {
180 buf_ptr = VLAN_RX_BDS_OFF;
181 }
182
183 bd = vio_ldq(&dev->sdev, dev->buf_list + buf_ptr);
184
185 trace_spapr_vlan_get_rx_bd_from_page(buf_ptr, (uint64_t)bd);
186 } while ((!(bd & VLAN_BD_VALID) || VLAN_BD_LEN(bd) < size + 8)
187 && buf_ptr != dev->use_buf_ptr);
188
189 if (!(bd & VLAN_BD_VALID) || VLAN_BD_LEN(bd) < size + 8) {
190 /* Failed to find a suitable buffer */
191 return 0;
192 }
193
194 /* Remove the buffer from the pool */
195 dev->use_buf_ptr = buf_ptr;
196 vio_stq(&dev->sdev, dev->buf_list + dev->use_buf_ptr, 0);
197
198 trace_spapr_vlan_get_rx_bd_from_page_found(dev->use_buf_ptr, dev->rx_bufs);
199
200 return bd;
201 }
202
spapr_vlan_receive(NetClientState * nc,const uint8_t * buf,size_t size)203 static ssize_t spapr_vlan_receive(NetClientState *nc, const uint8_t *buf,
204 size_t size)
205 {
206 SpaprVioVlan *dev = qemu_get_nic_opaque(nc);
207 SpaprVioDevice *sdev = VIO_SPAPR_DEVICE(dev);
208 vlan_bd_t rxq_bd = vio_ldq(sdev, dev->buf_list + VLAN_RXQ_BD_OFF);
209 vlan_bd_t bd;
210 uint64_t handle;
211 uint8_t control;
212
213 trace_spapr_vlan_receive(sdev->qdev.id, dev->rx_bufs);
214
215 if (!dev->isopen) {
216 return -1;
217 }
218
219 if (!dev->rx_bufs) {
220 spapr_vlan_record_dropped_rx_frame(dev);
221 return 0;
222 }
223
224 if (dev->compat_flags & SPAPRVLAN_FLAG_RX_BUF_POOLS) {
225 bd = spapr_vlan_get_rx_bd_from_pool(dev, size);
226 } else {
227 bd = spapr_vlan_get_rx_bd_from_page(dev, size);
228 }
229 if (!bd) {
230 spapr_vlan_record_dropped_rx_frame(dev);
231 return 0;
232 }
233
234 dev->rx_bufs--;
235
236 /* Transfer the packet data */
237 if (spapr_vio_dma_write(sdev, VLAN_BD_ADDR(bd) + 8, buf, size) < 0) {
238 return -1;
239 }
240
241 trace_spapr_vlan_receive_dma_completed();
242
243 /* Update the receive queue */
244 control = VLAN_RXQC_TOGGLE | VLAN_RXQC_VALID;
245 if (rxq_bd & VLAN_BD_TOGGLE) {
246 control ^= VLAN_RXQC_TOGGLE;
247 }
248
249 handle = vio_ldq(sdev, VLAN_BD_ADDR(bd));
250 vio_stq(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr + 8, handle);
251 vio_stl(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr + 4, size);
252 vio_sth(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr + 2, 8);
253 vio_stb(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr, control);
254
255 trace_spapr_vlan_receive_wrote(dev->rxq_ptr,
256 vio_ldq(sdev, VLAN_BD_ADDR(rxq_bd) +
257 dev->rxq_ptr),
258 vio_ldq(sdev, VLAN_BD_ADDR(rxq_bd) +
259 dev->rxq_ptr + 8));
260
261 dev->rxq_ptr += 16;
262 if (dev->rxq_ptr >= VLAN_BD_LEN(rxq_bd)) {
263 dev->rxq_ptr = 0;
264 vio_stq(sdev, dev->buf_list + VLAN_RXQ_BD_OFF, rxq_bd ^ VLAN_BD_TOGGLE);
265 }
266
267 if (sdev->signal_state & 1) {
268 spapr_vio_irq_pulse(sdev);
269 }
270
271 return size;
272 }
273
274 static NetClientInfo net_spapr_vlan_info = {
275 .type = NET_CLIENT_DRIVER_NIC,
276 .size = sizeof(NICState),
277 .can_receive = spapr_vlan_can_receive,
278 .receive = spapr_vlan_receive,
279 };
280
spapr_vlan_flush_rx_queue(void * opaque)281 static void spapr_vlan_flush_rx_queue(void *opaque)
282 {
283 SpaprVioVlan *dev = opaque;
284
285 qemu_flush_queued_packets(qemu_get_queue(dev->nic));
286 }
287
spapr_vlan_reset_rx_pool(RxBufPool * rxp)288 static void spapr_vlan_reset_rx_pool(RxBufPool *rxp)
289 {
290 /*
291 * Use INT_MAX as bufsize so that unused buffers are moved to the end
292 * of the list during the qsort in spapr_vlan_add_rxbuf_to_pool() later.
293 */
294 rxp->bufsize = INT_MAX;
295 rxp->count = 0;
296 memset(rxp->bds, 0, sizeof(rxp->bds));
297 }
298
spapr_vlan_reset(SpaprVioDevice * sdev)299 static void spapr_vlan_reset(SpaprVioDevice *sdev)
300 {
301 SpaprVioVlan *dev = VIO_SPAPR_VLAN_DEVICE(sdev);
302 int i;
303
304 dev->buf_list = 0;
305 dev->rx_bufs = 0;
306 dev->isopen = 0;
307
308 if (dev->compat_flags & SPAPRVLAN_FLAG_RX_BUF_POOLS) {
309 for (i = 0; i < RX_MAX_POOLS; i++) {
310 spapr_vlan_reset_rx_pool(dev->rx_pool[i]);
311 }
312 }
313
314 memcpy(&dev->nicconf.macaddr.a, &dev->perm_mac.a,
315 sizeof(dev->nicconf.macaddr.a));
316 qemu_format_nic_info_str(qemu_get_queue(dev->nic), dev->nicconf.macaddr.a);
317 }
318
spapr_vlan_realize(SpaprVioDevice * sdev,Error ** errp)319 static void spapr_vlan_realize(SpaprVioDevice *sdev, Error **errp)
320 {
321 SpaprVioVlan *dev = VIO_SPAPR_VLAN_DEVICE(sdev);
322
323 qemu_macaddr_default_if_unset(&dev->nicconf.macaddr);
324
325 memcpy(&dev->perm_mac.a, &dev->nicconf.macaddr.a, sizeof(dev->perm_mac.a));
326
327 dev->nic = qemu_new_nic(&net_spapr_vlan_info, &dev->nicconf,
328 object_get_typename(OBJECT(sdev)), sdev->qdev.id,
329 &sdev->qdev.mem_reentrancy_guard, dev);
330 qemu_format_nic_info_str(qemu_get_queue(dev->nic), dev->nicconf.macaddr.a);
331
332 dev->rxp_timer = timer_new_us(QEMU_CLOCK_VIRTUAL, spapr_vlan_flush_rx_queue,
333 dev);
334 }
335
spapr_vlan_instance_init(Object * obj)336 static void spapr_vlan_instance_init(Object *obj)
337 {
338 SpaprVioVlan *dev = VIO_SPAPR_VLAN_DEVICE(obj);
339 int i;
340
341 device_add_bootindex_property(obj, &dev->nicconf.bootindex,
342 "bootindex", "",
343 DEVICE(dev));
344
345 if (dev->compat_flags & SPAPRVLAN_FLAG_RX_BUF_POOLS) {
346 for (i = 0; i < RX_MAX_POOLS; i++) {
347 dev->rx_pool[i] = g_new(RxBufPool, 1);
348 spapr_vlan_reset_rx_pool(dev->rx_pool[i]);
349 }
350 }
351 }
352
spapr_vlan_instance_finalize(Object * obj)353 static void spapr_vlan_instance_finalize(Object *obj)
354 {
355 SpaprVioVlan *dev = VIO_SPAPR_VLAN_DEVICE(obj);
356 int i;
357
358 if (dev->compat_flags & SPAPRVLAN_FLAG_RX_BUF_POOLS) {
359 for (i = 0; i < RX_MAX_POOLS; i++) {
360 g_free(dev->rx_pool[i]);
361 dev->rx_pool[i] = NULL;
362 }
363 }
364
365 if (dev->rxp_timer) {
366 timer_free(dev->rxp_timer);
367 }
368 }
369
spapr_vlan_create(SpaprVioBus * bus,NICInfo * nd)370 void spapr_vlan_create(SpaprVioBus *bus, NICInfo *nd)
371 {
372 DeviceState *dev;
373
374 dev = qdev_new("spapr-vlan");
375
376 qdev_set_nic_properties(dev, nd);
377
378 qdev_realize_and_unref(dev, &bus->bus, &error_fatal);
379 }
380
spapr_vlan_devnode(SpaprVioDevice * dev,void * fdt,int node_off)381 static int spapr_vlan_devnode(SpaprVioDevice *dev, void *fdt, int node_off)
382 {
383 SpaprVioVlan *vdev = VIO_SPAPR_VLAN_DEVICE(dev);
384 uint8_t padded_mac[8] = {0, 0};
385 int ret;
386
387 /* Some old phyp versions give the mac address in an 8-byte
388 * property. The kernel driver (before 3.10) has an insane workaround;
389 * rather than doing the obvious thing and checking the property
390 * length, it checks whether the first byte has 0b10 in the low
391 * bits. If a correct 6-byte property has a different first byte
392 * the kernel will get the wrong mac address, overrunning its
393 * buffer in the process (read only, thank goodness).
394 *
395 * Here we return a 6-byte address unless that would break a pre-3.10
396 * driver. In that case we return a padded 8-byte address to allow the old
397 * workaround to succeed. */
398 if ((vdev->nicconf.macaddr.a[0] & 0x3) == 0x2) {
399 ret = fdt_setprop(fdt, node_off, "local-mac-address",
400 &vdev->nicconf.macaddr, ETH_ALEN);
401 } else {
402 memcpy(&padded_mac[2], &vdev->nicconf.macaddr, ETH_ALEN);
403 ret = fdt_setprop(fdt, node_off, "local-mac-address",
404 padded_mac, sizeof(padded_mac));
405 }
406 if (ret < 0) {
407 return ret;
408 }
409
410 ret = fdt_setprop_cell(fdt, node_off, "ibm,mac-address-filters", 0);
411 if (ret < 0) {
412 return ret;
413 }
414
415 return 0;
416 }
417
check_bd(SpaprVioVlan * dev,vlan_bd_t bd,target_ulong alignment)418 static int check_bd(SpaprVioVlan *dev, vlan_bd_t bd,
419 target_ulong alignment)
420 {
421 if ((VLAN_BD_ADDR(bd) % alignment)
422 || (VLAN_BD_LEN(bd) % alignment)) {
423 return -1;
424 }
425
426 if (!spapr_vio_dma_valid(&dev->sdev, VLAN_BD_ADDR(bd),
427 VLAN_BD_LEN(bd), DMA_DIRECTION_FROM_DEVICE)
428 || !spapr_vio_dma_valid(&dev->sdev, VLAN_BD_ADDR(bd),
429 VLAN_BD_LEN(bd), DMA_DIRECTION_TO_DEVICE)) {
430 return -1;
431 }
432
433 return 0;
434 }
435
h_register_logical_lan(PowerPCCPU * cpu,SpaprMachineState * spapr,target_ulong opcode,target_ulong * args)436 static target_ulong h_register_logical_lan(PowerPCCPU *cpu,
437 SpaprMachineState *spapr,
438 target_ulong opcode,
439 target_ulong *args)
440 {
441 target_ulong reg = args[0];
442 target_ulong buf_list = args[1];
443 target_ulong rec_queue = args[2];
444 target_ulong filter_list = args[3];
445 SpaprVioDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
446 SpaprVioVlan *dev = VIO_SPAPR_VLAN_DEVICE(sdev);
447 vlan_bd_t filter_list_bd;
448
449 if (!dev) {
450 return H_PARAMETER;
451 }
452
453 if (dev->isopen) {
454 hcall_dprintf("H_REGISTER_LOGICAL_LAN called twice without "
455 "H_FREE_LOGICAL_LAN\n");
456 return H_RESOURCE;
457 }
458
459 if (check_bd(dev, VLAN_VALID_BD(buf_list, SPAPR_TCE_PAGE_SIZE),
460 SPAPR_TCE_PAGE_SIZE) < 0) {
461 hcall_dprintf("Bad buf_list 0x" TARGET_FMT_lx "\n", buf_list);
462 return H_PARAMETER;
463 }
464
465 filter_list_bd = VLAN_VALID_BD(filter_list, SPAPR_TCE_PAGE_SIZE);
466 if (check_bd(dev, filter_list_bd, SPAPR_TCE_PAGE_SIZE) < 0) {
467 hcall_dprintf("Bad filter_list 0x" TARGET_FMT_lx "\n", filter_list);
468 return H_PARAMETER;
469 }
470
471 if (!(rec_queue & VLAN_BD_VALID)
472 || (check_bd(dev, rec_queue, VLAN_RQ_ALIGNMENT) < 0)) {
473 hcall_dprintf("Bad receive queue\n");
474 return H_PARAMETER;
475 }
476
477 dev->buf_list = buf_list;
478 sdev->signal_state = 0;
479
480 rec_queue &= ~VLAN_BD_TOGGLE;
481
482 /* Initialize the buffer list */
483 vio_stq(sdev, buf_list, rec_queue);
484 vio_stq(sdev, buf_list + 8, filter_list_bd);
485 spapr_vio_dma_set(sdev, buf_list + VLAN_RX_BDS_OFF, 0,
486 SPAPR_TCE_PAGE_SIZE - VLAN_RX_BDS_OFF);
487 dev->add_buf_ptr = VLAN_RX_BDS_OFF - 8;
488 dev->use_buf_ptr = VLAN_RX_BDS_OFF - 8;
489 dev->rx_bufs = 0;
490 dev->rxq_ptr = 0;
491
492 /* Initialize the receive queue */
493 spapr_vio_dma_set(sdev, VLAN_BD_ADDR(rec_queue), 0, VLAN_BD_LEN(rec_queue));
494
495 dev->isopen = 1;
496 qemu_flush_queued_packets(qemu_get_queue(dev->nic));
497
498 return H_SUCCESS;
499 }
500
501
h_free_logical_lan(PowerPCCPU * cpu,SpaprMachineState * spapr,target_ulong opcode,target_ulong * args)502 static target_ulong h_free_logical_lan(PowerPCCPU *cpu,
503 SpaprMachineState *spapr,
504 target_ulong opcode, target_ulong *args)
505 {
506 target_ulong reg = args[0];
507 SpaprVioDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
508 SpaprVioVlan *dev = VIO_SPAPR_VLAN_DEVICE(sdev);
509
510 if (!dev) {
511 return H_PARAMETER;
512 }
513
514 if (!dev->isopen) {
515 hcall_dprintf("H_FREE_LOGICAL_LAN called without "
516 "H_REGISTER_LOGICAL_LAN\n");
517 return H_RESOURCE;
518 }
519
520 spapr_vlan_reset(sdev);
521 return H_SUCCESS;
522 }
523
524 /**
525 * Used for qsort, this function compares two RxBufPools by size.
526 */
rx_pool_size_compare(const void * p1,const void * p2)527 static int rx_pool_size_compare(const void *p1, const void *p2)
528 {
529 const RxBufPool *pool1 = *(RxBufPool **)p1;
530 const RxBufPool *pool2 = *(RxBufPool **)p2;
531
532 if (pool1->bufsize < pool2->bufsize) {
533 return -1;
534 }
535 return pool1->bufsize > pool2->bufsize;
536 }
537
538 /**
539 * Search for a matching buffer pool with exact matching size,
540 * or return -1 if no matching pool has been found.
541 */
spapr_vlan_get_rx_pool_id(SpaprVioVlan * dev,int size)542 static int spapr_vlan_get_rx_pool_id(SpaprVioVlan *dev, int size)
543 {
544 int pool;
545
546 for (pool = 0; pool < RX_MAX_POOLS; pool++) {
547 if (dev->rx_pool[pool]->bufsize == size) {
548 return pool;
549 }
550 }
551
552 return -1;
553 }
554
555 /**
556 * Enqueuing receive buffer by adding it to one of our receive buffer pools
557 */
spapr_vlan_add_rxbuf_to_pool(SpaprVioVlan * dev,target_ulong buf)558 static target_long spapr_vlan_add_rxbuf_to_pool(SpaprVioVlan *dev,
559 target_ulong buf)
560 {
561 int size = VLAN_BD_LEN(buf);
562 int pool;
563
564 pool = spapr_vlan_get_rx_pool_id(dev, size);
565 if (pool < 0) {
566 /*
567 * No matching pool found? Try to use a new one. If the guest used all
568 * pools before, but changed the size of one pool in the meantime, we might
569 * need to recycle that pool here (if it's empty already). Thus scan
570 * all buffer pools now, starting with the last (likely empty) one.
571 */
572 for (pool = RX_MAX_POOLS - 1; pool >= 0 ; pool--) {
573 if (dev->rx_pool[pool]->count == 0) {
574 dev->rx_pool[pool]->bufsize = size;
575 /*
576 * Sort pools by size so that spapr_vlan_receive()
577 * can later find the smallest buffer pool easily.
578 */
579 qsort(dev->rx_pool, RX_MAX_POOLS, sizeof(dev->rx_pool[0]),
580 rx_pool_size_compare);
581 pool = spapr_vlan_get_rx_pool_id(dev, size);
582 trace_spapr_vlan_add_rxbuf_to_pool_create(pool,
583 VLAN_BD_LEN(buf));
584 break;
585 }
586 }
587 }
588 /* Still no usable pool? Give up */
589 if (pool < 0 || dev->rx_pool[pool]->count >= RX_POOL_MAX_BDS) {
590 return H_RESOURCE;
591 }
592
593 trace_spapr_vlan_add_rxbuf_to_pool(pool, VLAN_BD_LEN(buf),
594 dev->rx_pool[pool]->count);
595
596 dev->rx_pool[pool]->bds[dev->rx_pool[pool]->count++] = buf;
597
598 return 0;
599 }
600
601 /**
602 * This is the old way of enqueuing receive buffers: Add it to the rx queue
603 * page that has been supplied by the guest (which is quite limited in size).
604 */
spapr_vlan_add_rxbuf_to_page(SpaprVioVlan * dev,target_ulong buf)605 static target_long spapr_vlan_add_rxbuf_to_page(SpaprVioVlan *dev,
606 target_ulong buf)
607 {
608 vlan_bd_t bd;
609
610 if (dev->rx_bufs >= VLAN_MAX_BUFS) {
611 return H_RESOURCE;
612 }
613
614 do {
615 dev->add_buf_ptr += 8;
616 if (dev->add_buf_ptr >= VLAN_RX_BDS_LEN + VLAN_RX_BDS_OFF) {
617 dev->add_buf_ptr = VLAN_RX_BDS_OFF;
618 }
619
620 bd = vio_ldq(&dev->sdev, dev->buf_list + dev->add_buf_ptr);
621 } while (bd & VLAN_BD_VALID);
622
623 vio_stq(&dev->sdev, dev->buf_list + dev->add_buf_ptr, buf);
624
625 trace_spapr_vlan_add_rxbuf_to_page(dev->add_buf_ptr, dev->rx_bufs, buf);
626
627 return 0;
628 }
629
h_add_logical_lan_buffer(PowerPCCPU * cpu,SpaprMachineState * spapr,target_ulong opcode,target_ulong * args)630 static target_ulong h_add_logical_lan_buffer(PowerPCCPU *cpu,
631 SpaprMachineState *spapr,
632 target_ulong opcode,
633 target_ulong *args)
634 {
635 target_ulong reg = args[0];
636 target_ulong buf = args[1];
637 SpaprVioDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
638 SpaprVioVlan *dev = VIO_SPAPR_VLAN_DEVICE(sdev);
639 target_long ret;
640
641 trace_spapr_vlan_h_add_logical_lan_buffer(reg, buf);
642
643 if (!sdev) {
644 hcall_dprintf("Bad device\n");
645 return H_PARAMETER;
646 }
647
648 if ((check_bd(dev, buf, 4) < 0)
649 || (VLAN_BD_LEN(buf) < 16)) {
650 hcall_dprintf("Bad buffer enqueued\n");
651 return H_PARAMETER;
652 }
653
654 if (!dev->isopen) {
655 return H_RESOURCE;
656 }
657
658 if (dev->compat_flags & SPAPRVLAN_FLAG_RX_BUF_POOLS) {
659 ret = spapr_vlan_add_rxbuf_to_pool(dev, buf);
660 } else {
661 ret = spapr_vlan_add_rxbuf_to_page(dev, buf);
662 }
663 if (ret) {
664 return ret;
665 }
666
667 dev->rx_bufs++;
668
669 /*
670 * Give guest some more time to add additional RX buffers before we
671 * flush the receive queue, so that e.g. fragmented IP packets can
672 * be passed to the guest in one go later (instead of passing single
673 * fragments if there is only one receive buffer available).
674 */
675 timer_mod(dev->rxp_timer, qemu_clock_get_us(QEMU_CLOCK_VIRTUAL) + 500);
676
677 return H_SUCCESS;
678 }
679
h_send_logical_lan(PowerPCCPU * cpu,SpaprMachineState * spapr,target_ulong opcode,target_ulong * args)680 static target_ulong h_send_logical_lan(PowerPCCPU *cpu,
681 SpaprMachineState *spapr,
682 target_ulong opcode, target_ulong *args)
683 {
684 target_ulong reg = args[0];
685 target_ulong *bufs = args + 1;
686 target_ulong continue_token = args[7];
687 SpaprVioDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
688 SpaprVioVlan *dev = VIO_SPAPR_VLAN_DEVICE(sdev);
689 unsigned total_len;
690 uint8_t *p;
691 g_autofree uint8_t *lbuf = NULL;
692 int i, nbufs;
693 int ret;
694
695 trace_spapr_vlan_h_send_logical_lan(reg, continue_token);
696
697 if (!sdev) {
698 return H_PARAMETER;
699 }
700
701 trace_spapr_vlan_h_send_logical_lan_rxbufs(dev->rx_bufs);
702
703 if (!dev->isopen) {
704 return H_DROPPED;
705 }
706
707 if (continue_token) {
708 return H_HARDWARE; /* FIXME actually handle this */
709 }
710
711 total_len = 0;
712 for (i = 0; i < 6; i++) {
713 trace_spapr_vlan_h_send_logical_lan_buf_desc(bufs[i]);
714 if (!(bufs[i] & VLAN_BD_VALID)) {
715 break;
716 }
717 total_len += VLAN_BD_LEN(bufs[i]);
718 }
719
720 nbufs = i;
721 trace_spapr_vlan_h_send_logical_lan_total(nbufs, total_len);
722
723 if (total_len == 0) {
724 return H_SUCCESS;
725 }
726
727 if (total_len > MAX_PACKET_SIZE) {
728 /* Don't let the guest force too large an allocation */
729 return H_RESOURCE;
730 }
731
732 lbuf = g_malloc(total_len);
733 p = lbuf;
734 for (i = 0; i < nbufs; i++) {
735 ret = spapr_vio_dma_read(sdev, VLAN_BD_ADDR(bufs[i]),
736 p, VLAN_BD_LEN(bufs[i]));
737 if (ret < 0) {
738 return ret;
739 }
740
741 p += VLAN_BD_LEN(bufs[i]);
742 }
743
744 qemu_send_packet(qemu_get_queue(dev->nic), lbuf, total_len);
745
746 return H_SUCCESS;
747 }
748
h_multicast_ctrl(PowerPCCPU * cpu,SpaprMachineState * spapr,target_ulong opcode,target_ulong * args)749 static target_ulong h_multicast_ctrl(PowerPCCPU *cpu, SpaprMachineState *spapr,
750 target_ulong opcode, target_ulong *args)
751 {
752 target_ulong reg = args[0];
753 SpaprVioDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
754
755 if (!dev) {
756 return H_PARAMETER;
757 }
758
759 return H_SUCCESS;
760 }
761
h_change_logical_lan_mac(PowerPCCPU * cpu,SpaprMachineState * spapr,target_ulong opcode,target_ulong * args)762 static target_ulong h_change_logical_lan_mac(PowerPCCPU *cpu,
763 SpaprMachineState *spapr,
764 target_ulong opcode,
765 target_ulong *args)
766 {
767 target_ulong reg = args[0];
768 target_ulong macaddr = args[1];
769 SpaprVioDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
770 SpaprVioVlan *dev = VIO_SPAPR_VLAN_DEVICE(sdev);
771 int i;
772
773 if (!dev) {
774 hcall_dprintf("H_CHANGE_LOGICAL_LAN_MAC called when "
775 "no NIC is present\n");
776 return H_PARAMETER;
777 }
778
779 for (i = 0; i < ETH_ALEN; i++) {
780 dev->nicconf.macaddr.a[ETH_ALEN - i - 1] = macaddr & 0xff;
781 macaddr >>= 8;
782 }
783
784 qemu_format_nic_info_str(qemu_get_queue(dev->nic), dev->nicconf.macaddr.a);
785
786 return H_SUCCESS;
787 }
788
789 static Property spapr_vlan_properties[] = {
790 DEFINE_SPAPR_PROPERTIES(SpaprVioVlan, sdev),
791 DEFINE_NIC_PROPERTIES(SpaprVioVlan, nicconf),
792 DEFINE_PROP_BIT("use-rx-buffer-pools", SpaprVioVlan,
793 compat_flags, SPAPRVLAN_FLAG_RX_BUF_POOLS_BIT, true),
794 DEFINE_PROP_END_OF_LIST(),
795 };
796
spapr_vlan_rx_buffer_pools_needed(void * opaque)797 static bool spapr_vlan_rx_buffer_pools_needed(void *opaque)
798 {
799 SpaprVioVlan *dev = opaque;
800
801 return (dev->compat_flags & SPAPRVLAN_FLAG_RX_BUF_POOLS) != 0;
802 }
803
804 static const VMStateDescription vmstate_rx_buffer_pool = {
805 .name = "spapr_llan/rx_buffer_pool",
806 .version_id = 1,
807 .minimum_version_id = 1,
808 .needed = spapr_vlan_rx_buffer_pools_needed,
809 .fields = (const VMStateField[]) {
810 VMSTATE_INT32(bufsize, RxBufPool),
811 VMSTATE_INT32(count, RxBufPool),
812 VMSTATE_UINT64_ARRAY(bds, RxBufPool, RX_POOL_MAX_BDS),
813 VMSTATE_END_OF_LIST()
814 }
815 };
816
817 static const VMStateDescription vmstate_rx_pools = {
818 .name = "spapr_llan/rx_pools",
819 .version_id = 1,
820 .minimum_version_id = 1,
821 .needed = spapr_vlan_rx_buffer_pools_needed,
822 .fields = (const VMStateField[]) {
823 VMSTATE_ARRAY_OF_POINTER_TO_STRUCT(rx_pool, SpaprVioVlan,
824 RX_MAX_POOLS, 1,
825 vmstate_rx_buffer_pool, RxBufPool),
826 VMSTATE_END_OF_LIST()
827 }
828 };
829
830 static const VMStateDescription vmstate_spapr_llan = {
831 .name = "spapr_llan",
832 .version_id = 1,
833 .minimum_version_id = 1,
834 .fields = (const VMStateField[]) {
835 VMSTATE_SPAPR_VIO(sdev, SpaprVioVlan),
836 /* LLAN state */
837 VMSTATE_BOOL(isopen, SpaprVioVlan),
838 VMSTATE_UINT64(buf_list, SpaprVioVlan),
839 VMSTATE_UINT32(add_buf_ptr, SpaprVioVlan),
840 VMSTATE_UINT32(use_buf_ptr, SpaprVioVlan),
841 VMSTATE_UINT32(rx_bufs, SpaprVioVlan),
842 VMSTATE_UINT64(rxq_ptr, SpaprVioVlan),
843
844 VMSTATE_END_OF_LIST()
845 },
846 .subsections = (const VMStateDescription * const []) {
847 &vmstate_rx_pools,
848 NULL
849 }
850 };
851
spapr_vlan_class_init(ObjectClass * klass,void * data)852 static void spapr_vlan_class_init(ObjectClass *klass, void *data)
853 {
854 DeviceClass *dc = DEVICE_CLASS(klass);
855 SpaprVioDeviceClass *k = VIO_SPAPR_DEVICE_CLASS(klass);
856
857 k->realize = spapr_vlan_realize;
858 k->reset = spapr_vlan_reset;
859 k->devnode = spapr_vlan_devnode;
860 k->dt_name = "l-lan";
861 k->dt_type = "network";
862 k->dt_compatible = "IBM,l-lan";
863 k->signal_mask = 0x1;
864 set_bit(DEVICE_CATEGORY_NETWORK, dc->categories);
865 device_class_set_props(dc, spapr_vlan_properties);
866 k->rtce_window_size = 0x10000000;
867 dc->vmsd = &vmstate_spapr_llan;
868 }
869
870 static const TypeInfo spapr_vlan_info = {
871 .name = TYPE_VIO_SPAPR_VLAN_DEVICE,
872 .parent = TYPE_VIO_SPAPR_DEVICE,
873 .instance_size = sizeof(SpaprVioVlan),
874 .class_init = spapr_vlan_class_init,
875 .instance_init = spapr_vlan_instance_init,
876 .instance_finalize = spapr_vlan_instance_finalize,
877 };
878
spapr_vlan_register_types(void)879 static void spapr_vlan_register_types(void)
880 {
881 spapr_register_hypercall(H_REGISTER_LOGICAL_LAN, h_register_logical_lan);
882 spapr_register_hypercall(H_FREE_LOGICAL_LAN, h_free_logical_lan);
883 spapr_register_hypercall(H_SEND_LOGICAL_LAN, h_send_logical_lan);
884 spapr_register_hypercall(H_ADD_LOGICAL_LAN_BUFFER,
885 h_add_logical_lan_buffer);
886 spapr_register_hypercall(H_MULTICAST_CTRL, h_multicast_ctrl);
887 spapr_register_hypercall(H_CHANGE_LOGICAL_LAN_MAC,
888 h_change_logical_lan_mac);
889 type_register_static(&spapr_vlan_info);
890 }
891
892 type_init(spapr_vlan_register_types)
893