xref: /freebsd/sys/powerpc/pseries/phyp_llan.c (revision 5d3e7166) 
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3  *
4  * Copyright 2013 Nathan Whitehorn
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26  * SUCH DAMAGE.
27  */
28 
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
31 
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/sockio.h>
35 #include <sys/endian.h>
36 #include <sys/lock.h>
37 #include <sys/mbuf.h>
38 #include <sys/module.h>
39 #include <sys/malloc.h>
40 #include <sys/mutex.h>
41 #include <sys/kernel.h>
42 #include <sys/socket.h>
43 
44 #include <net/bpf.h>
45 #include <net/if.h>
46 #include <net/if_var.h>
47 #include <net/ethernet.h>
48 #include <net/if_dl.h>
49 #include <net/if_media.h>
50 #include <net/if_types.h>
51 
52 #include <dev/ofw/openfirm.h>
53 #include <dev/ofw/ofw_bus.h>
54 #include <dev/ofw/ofw_bus_subr.h>
55 #include <machine/bus.h>
56 #include <machine/resource.h>
57 #include <sys/bus.h>
58 #include <sys/rman.h>
59 
60 #include <powerpc/pseries/phyp-hvcall.h>
61 
62 #define LLAN_MAX_RX_PACKETS	100
63 #define LLAN_MAX_TX_PACKETS	100
64 #define LLAN_RX_BUF_LEN		8*PAGE_SIZE
65 
66 #define LLAN_BUFDESC_VALID	(1ULL << 63)
67 #define LLAN_ADD_MULTICAST	0x1
68 #define LLAN_DEL_MULTICAST	0x2
69 #define LLAN_CLEAR_MULTICAST	0x3
70 
71 struct llan_xfer {
72 	struct mbuf *rx_mbuf;
73 	bus_dmamap_t rx_dmamap;
74 	uint64_t rx_bufdesc;
75 };
76 
77 struct llan_receive_queue_entry { /* PAPR page 539 */
78 	uint8_t control;
79 	uint8_t reserved;
80 	uint16_t offset;
81 	uint32_t length;
82 	uint64_t handle;
83 } __packed;
84 
85 struct llan_softc {
86 	device_t	dev;
87 	struct mtx	io_lock;
88 
89 	cell_t		unit;
90 	uint8_t		mac_address[8];
91 
92 	struct ifmedia	media;
93 
94 	int		irqid;
95 	struct resource	*irq;
96 	void		*irq_cookie;
97 
98 	bus_dma_tag_t	rx_dma_tag;
99 	bus_dma_tag_t	rxbuf_dma_tag;
100 	bus_dma_tag_t	tx_dma_tag;
101 
102 	bus_dmamap_t	tx_dma_map;
103 
104 	struct llan_receive_queue_entry *rx_buf;
105 	int		rx_dma_slot;
106 	int		rx_valid_val;
107 	bus_dmamap_t	rx_buf_map;
108 	bus_addr_t	rx_buf_phys;
109 	bus_size_t	rx_buf_len;
110 	bus_addr_t	input_buf_phys;
111 	bus_addr_t	filter_buf_phys;
112 	struct llan_xfer rx_xfer[LLAN_MAX_RX_PACKETS];
113 
114 	struct ifnet	*ifp;
115 };
116 
117 static int	llan_probe(device_t);
118 static int	llan_attach(device_t);
119 static void	llan_intr(void *xsc);
120 static void	llan_init(void *xsc);
121 static void	llan_start(struct ifnet *ifp);
122 static int	llan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
123 static void	llan_media_status(struct ifnet *ifp, struct ifmediareq *ifmr);
124 static int	llan_media_change(struct ifnet *ifp);
125 static void	llan_rx_load_cb(void *xsc, bus_dma_segment_t *segs, int nsegs,
126 		    int err);
127 static int	llan_add_rxbuf(struct llan_softc *sc, struct llan_xfer *rx);
128 static int	llan_set_multicast(struct llan_softc *sc);
129 
130 static device_method_t  llan_methods[] = {
131         DEVMETHOD(device_probe,         llan_probe),
132         DEVMETHOD(device_attach,        llan_attach),
133 
134         DEVMETHOD_END
135 };
136 
137 static driver_t llan_driver = {
138         "llan",
139         llan_methods,
140         sizeof(struct llan_softc)
141 };
142 
143 DRIVER_MODULE(llan, vdevice, llan_driver, 0, 0);
144 
145 static int
146 llan_probe(device_t dev)
147 {
148 	if (!ofw_bus_is_compatible(dev,"IBM,l-lan"))
149 		return (ENXIO);
150 
151 	device_set_desc(dev, "POWER Hypervisor Virtual Ethernet");
152 	return (0);
153 }
154 
155 static int
156 llan_attach(device_t dev)
157 {
158 	struct llan_softc *sc;
159 	phandle_t node;
160 	int i;
161 	ssize_t len;
162 
163 	sc = device_get_softc(dev);
164 	sc->dev = dev;
165 
166 	/* Get firmware properties */
167 	node = ofw_bus_get_node(dev);
168 	len = OF_getprop(node, "local-mac-address", sc->mac_address,
169 	    sizeof(sc->mac_address));
170 	/* If local-mac-address property has only 6 bytes (ETHER_ADDR_LEN)
171 	 * instead of 8 (sizeof(sc->mac_address)), then its value must be
172 	 * shifted 2 bytes to the right. */
173 	if (len == ETHER_ADDR_LEN) {
174 		bcopy(sc->mac_address, &sc->mac_address[2], len);
175 		/* Zero out the first 2 bytes. */
176 		bzero(sc->mac_address, 2);
177 	}
178 	OF_getencprop(node, "reg", &sc->unit, sizeof(sc->unit));
179 
180 	mtx_init(&sc->io_lock, "llan", NULL, MTX_DEF);
181 
182         /* Setup interrupt */
183 	sc->irqid = 0;
184 	sc->irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &sc->irqid,
185 	    RF_ACTIVE);
186 
187 	if (!sc->irq) {
188 		device_printf(dev, "Could not allocate IRQ\n");
189 		mtx_destroy(&sc->io_lock);
190 		return (ENXIO);
191 	}
192 
193 	bus_setup_intr(dev, sc->irq, INTR_TYPE_NET | INTR_MPSAFE |
194 	    INTR_ENTROPY, NULL, llan_intr, sc, &sc->irq_cookie);
195 
196 	/* Setup DMA */
197 	bus_dma_tag_create(bus_get_dma_tag(dev), 16, 0,
198             BUS_SPACE_MAXADDR, BUS_SPACE_MAXADDR, NULL, NULL,
199 	    LLAN_RX_BUF_LEN, 1, BUS_SPACE_MAXSIZE_32BIT,
200 	    0, NULL, NULL, &sc->rx_dma_tag);
201 	bus_dma_tag_create(bus_get_dma_tag(dev), 4, 0,
202             BUS_SPACE_MAXADDR, BUS_SPACE_MAXADDR, NULL, NULL,
203 	    BUS_SPACE_MAXSIZE, 1, BUS_SPACE_MAXSIZE_32BIT,
204 	    0, NULL, NULL, &sc->rxbuf_dma_tag);
205 	bus_dma_tag_create(bus_get_dma_tag(dev), 1, 0,
206             BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, NULL, NULL,
207 	    BUS_SPACE_MAXSIZE, 6, BUS_SPACE_MAXSIZE_32BIT, 0,
208 	    busdma_lock_mutex, &sc->io_lock, &sc->tx_dma_tag);
209 
210 	bus_dmamem_alloc(sc->rx_dma_tag, (void **)&sc->rx_buf,
211 	    BUS_DMA_WAITOK | BUS_DMA_ZERO, &sc->rx_buf_map);
212 	bus_dmamap_load(sc->rx_dma_tag, sc->rx_buf_map, sc->rx_buf,
213 	    LLAN_RX_BUF_LEN, llan_rx_load_cb, sc, 0);
214 
215 	/* TX DMA maps */
216 	bus_dmamap_create(sc->tx_dma_tag, 0, &sc->tx_dma_map);
217 
218 	/* RX DMA */
219 	for (i = 0; i < LLAN_MAX_RX_PACKETS; i++) {
220 		bus_dmamap_create(sc->rxbuf_dma_tag, 0,
221 		    &sc->rx_xfer[i].rx_dmamap);
222 		sc->rx_xfer[i].rx_mbuf = NULL;
223 	}
224 
225 	/* Attach to network stack */
226 	sc->ifp = if_alloc(IFT_ETHER);
227 	if_setsoftc(sc->ifp, sc);
228 
229 	if_initname(sc->ifp, device_get_name(dev), device_get_unit(dev));
230 	if_setmtu(sc->ifp, ETHERMTU); /* XXX max-frame-size from OF? */
231 	if_setflags(sc->ifp, IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST);
232 	if_sethwassist(sc->ifp, 0); /* XXX: ibm,illan-options */
233 	if_setcapabilities(sc->ifp, 0);
234 	if_setcapenable(sc->ifp, 0);
235 	if_setstartfn(sc->ifp, llan_start);
236 	if_setioctlfn(sc->ifp, llan_ioctl);
237 	if_setinitfn(sc->ifp, llan_init);
238 
239 	ifmedia_init(&sc->media, IFM_IMASK, llan_media_change,
240 	    llan_media_status);
241 	ifmedia_add(&sc->media, IFM_ETHER | IFM_AUTO, 0, NULL);
242 	ifmedia_set(&sc->media, IFM_ETHER | IFM_AUTO);
243 
244 	if_setsendqlen(sc->ifp, LLAN_MAX_RX_PACKETS);
245 	if_setsendqready(sc->ifp);
246 
247 	ether_ifattach(sc->ifp, &sc->mac_address[2]);
248 
249 	/* We don't have link state reporting, so make it always up */
250 	if_link_state_change(sc->ifp, LINK_STATE_UP);
251 
252 	return (0);
253 }
254 
255 static int
256 llan_media_change(struct ifnet *ifp)
257 {
258 	struct llan_softc *sc = if_getsoftc(ifp);
259 
260 	if (IFM_TYPE(sc->media.ifm_media) != IFM_ETHER)
261 		return (EINVAL);
262 
263 	if (IFM_SUBTYPE(sc->media.ifm_media) != IFM_AUTO)
264 		return (EINVAL);
265 
266 	return (0);
267 }
268 
269 static void
270 llan_media_status(struct ifnet *ifp, struct ifmediareq *ifmr)
271 {
272 
273 	ifmr->ifm_status = IFM_AVALID | IFM_ACTIVE | IFM_UNKNOWN | IFM_FDX;
274 	ifmr->ifm_active = IFM_ETHER;
275 }
276 
277 static void
278 llan_rx_load_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int err)
279 {
280 	struct llan_softc *sc = xsc;
281 
282 	sc->rx_buf_phys = segs[0].ds_addr;
283 	sc->rx_buf_len = segs[0].ds_len - 2*PAGE_SIZE;
284 	sc->input_buf_phys = segs[0].ds_addr + segs[0].ds_len - PAGE_SIZE;
285 	sc->filter_buf_phys = segs[0].ds_addr + segs[0].ds_len - 2*PAGE_SIZE;
286 }
287 
288 static void
289 llan_init(void *xsc)
290 {
291 	struct llan_softc *sc = xsc;
292 	uint64_t rx_buf_desc;
293 	uint64_t macaddr;
294 	int i;
295 
296 	mtx_lock(&sc->io_lock);
297 
298 	phyp_hcall(H_FREE_LOGICAL_LAN, sc->unit);
299 
300 	/* Create buffers (page 539) */
301 	sc->rx_dma_slot = 0;
302 	sc->rx_valid_val = 1;
303 
304 	rx_buf_desc = LLAN_BUFDESC_VALID;
305 	rx_buf_desc |= (sc->rx_buf_len << 32);
306 	rx_buf_desc |= sc->rx_buf_phys;
307 	memcpy(&macaddr, sc->mac_address, 8);
308 	phyp_hcall(H_REGISTER_LOGICAL_LAN, sc->unit, sc->input_buf_phys,
309 	    rx_buf_desc, sc->filter_buf_phys, macaddr);
310 
311 	for (i = 0; i < LLAN_MAX_RX_PACKETS; i++)
312 		llan_add_rxbuf(sc, &sc->rx_xfer[i]);
313 
314 	phyp_hcall(H_VIO_SIGNAL, sc->unit, 1); /* Enable interrupts */
315 
316 	/* Tell stack we're up */
317 	if_setdrvflagbits(sc->ifp, IFF_DRV_RUNNING, IFF_DRV_OACTIVE);
318 
319 	mtx_unlock(&sc->io_lock);
320 
321 	/* Check for pending receives scheduled before interrupt enable */
322 	llan_intr(sc);
323 }
324 
325 static int
326 llan_add_rxbuf(struct llan_softc *sc, struct llan_xfer *rx)
327 {
328 	struct mbuf *m;
329 	bus_dma_segment_t segs[1];
330 	int error, nsegs;
331 
332 	mtx_assert(&sc->io_lock, MA_OWNED);
333 
334 	m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
335 	if (m == NULL)
336 		return (ENOBUFS);
337 
338 	m->m_len = m->m_pkthdr.len = m->m_ext.ext_size;
339 	if (rx->rx_mbuf != NULL) {
340 		bus_dmamap_sync(sc->rxbuf_dma_tag, rx->rx_dmamap,
341 		    BUS_DMASYNC_POSTREAD);
342 		bus_dmamap_unload(sc->rxbuf_dma_tag, rx->rx_dmamap);
343 	}
344 
345 	/* Save pointer to buffer structure */
346 	m_copyback(m, 0, 8, (void *)&rx);
347 
348 	error = bus_dmamap_load_mbuf_sg(sc->rxbuf_dma_tag, rx->rx_dmamap, m,
349 	    segs, &nsegs, BUS_DMA_NOWAIT);
350 	if (error != 0) {
351 		device_printf(sc->dev,
352 		    "cannot load RX DMA map %p, error = %d\n", rx, error);
353 		m_freem(m);
354 		return (error);
355 	}
356 
357 	/* If nsegs is wrong then the stack is corrupt. */
358 	KASSERT(nsegs == 1,
359 	    ("%s: too many DMA segments (%d)", __func__, nsegs));
360 	rx->rx_mbuf = m;
361 
362 	bus_dmamap_sync(sc->rxbuf_dma_tag, rx->rx_dmamap, BUS_DMASYNC_PREREAD);
363 
364 	rx->rx_bufdesc = LLAN_BUFDESC_VALID;
365 	rx->rx_bufdesc |= (((uint64_t)segs[0].ds_len) << 32);
366 	rx->rx_bufdesc |= segs[0].ds_addr;
367 	error = phyp_hcall(H_ADD_LOGICAL_LAN_BUFFER, sc->unit, rx->rx_bufdesc);
368 	if (error != 0) {
369 		m_freem(m);
370 		rx->rx_mbuf = NULL;
371 		return (ENOBUFS);
372 	}
373 
374         return (0);
375 }
376 
377 static void
378 llan_intr(void *xsc)
379 {
380 	struct llan_softc *sc = xsc;
381 	struct llan_xfer *rx;
382 	struct mbuf *m;
383 
384 	mtx_lock(&sc->io_lock);
385 restart:
386 	phyp_hcall(H_VIO_SIGNAL, sc->unit, 0);
387 
388 	while ((sc->rx_buf[sc->rx_dma_slot].control >> 7) == sc->rx_valid_val) {
389 		rx = (struct llan_xfer *)sc->rx_buf[sc->rx_dma_slot].handle;
390 		m = rx->rx_mbuf;
391 		m_adj(m, sc->rx_buf[sc->rx_dma_slot].offset - 8);
392 		m->m_len = sc->rx_buf[sc->rx_dma_slot].length;
393 
394 		/* llan_add_rxbuf does DMA sync and unload as well as requeue */
395 		if (llan_add_rxbuf(sc, rx) != 0) {
396 			if_inc_counter(sc->ifp, IFCOUNTER_IERRORS, 1);
397 			continue;
398 		}
399 
400 		if_inc_counter(sc->ifp, IFCOUNTER_IPACKETS, 1);
401 		m_adj(m, sc->rx_buf[sc->rx_dma_slot].offset);
402 		m->m_len = sc->rx_buf[sc->rx_dma_slot].length;
403 		m->m_pkthdr.rcvif = sc->ifp;
404 		m->m_pkthdr.len = m->m_len;
405 		sc->rx_dma_slot++;
406 
407 		if (sc->rx_dma_slot >= sc->rx_buf_len/sizeof(sc->rx_buf[0])) {
408 			sc->rx_dma_slot = 0;
409 			sc->rx_valid_val = !sc->rx_valid_val;
410 		}
411 
412 		mtx_unlock(&sc->io_lock);
413 		if_input(sc->ifp, m);
414 		mtx_lock(&sc->io_lock);
415 	}
416 
417 	phyp_hcall(H_VIO_SIGNAL, sc->unit, 1);
418 
419 	/*
420 	 * H_VIO_SIGNAL enables interrupts for future packets only.
421 	 * Make sure none were queued between the end of the loop and the
422 	 * enable interrupts call.
423 	 */
424 	if ((sc->rx_buf[sc->rx_dma_slot].control >> 7) == sc->rx_valid_val)
425 		goto restart;
426 
427 	mtx_unlock(&sc->io_lock);
428 }
429 
430 static void
431 llan_send_packet(void *xsc, bus_dma_segment_t *segs, int nsegs,
432     bus_size_t mapsize, int error)
433 {
434 	struct llan_softc *sc = xsc;
435 	uint64_t bufdescs[6];
436 	int i, err;
437 
438 	bzero(bufdescs, sizeof(bufdescs));
439 
440 	for (i = 0; i < nsegs; i++) {
441 		bufdescs[i] = LLAN_BUFDESC_VALID;
442 		bufdescs[i] |= (((uint64_t)segs[i].ds_len) << 32);
443 		bufdescs[i] |= segs[i].ds_addr;
444 	}
445 
446 	err = phyp_hcall(H_SEND_LOGICAL_LAN, sc->unit, bufdescs[0],
447 	    bufdescs[1], bufdescs[2], bufdescs[3], bufdescs[4], bufdescs[5], 0);
448 	/*
449 	 * The hypercall returning implies completion -- or that the call will
450 	 * not complete. In principle, we should try a few times if we get back
451 	 * H_BUSY based on the continuation token in R4. For now, just drop
452 	 * the packet in such cases.
453 	 */
454 	if (err == H_SUCCESS)
455 		if_inc_counter(sc->ifp, IFCOUNTER_OPACKETS, 1);
456 	else
457 		if_inc_counter(sc->ifp, IFCOUNTER_OERRORS, 1);
458 }
459 
460 static void
461 llan_start_locked(struct ifnet *ifp)
462 {
463 	struct llan_softc *sc = if_getsoftc(ifp);
464 	int nsegs;
465 	struct mbuf *mb_head, *m;
466 
467 	mtx_assert(&sc->io_lock, MA_OWNED);
468 
469 	if ((if_getdrvflags(ifp) & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) !=
470 	    IFF_DRV_RUNNING)
471 		return;
472 
473 	while (!if_sendq_empty(ifp)) {
474 		mb_head = if_dequeue(ifp);
475 
476 		if (mb_head == NULL)
477 			break;
478 
479 		BPF_MTAP(ifp, mb_head);
480 
481 		for (m = mb_head, nsegs = 0; m != NULL; m = m->m_next)
482 			nsegs++;
483 		if (nsegs > 6) {
484 			m = m_collapse(mb_head, M_NOWAIT, 6);
485 			if (m == NULL) {
486 				m_freem(mb_head);
487 				continue;
488 			}
489 		}
490 
491 		bus_dmamap_load_mbuf(sc->tx_dma_tag, sc->tx_dma_map,
492 			mb_head, llan_send_packet, sc, 0);
493 		bus_dmamap_unload(sc->tx_dma_tag, sc->tx_dma_map);
494 		m_freem(mb_head);
495 	}
496 }
497 
498 static void
499 llan_start(struct ifnet *ifp)
500 {
501 	struct llan_softc *sc = if_getsoftc(ifp);
502 
503 	mtx_lock(&sc->io_lock);
504 	llan_start_locked(ifp);
505 	mtx_unlock(&sc->io_lock);
506 }
507 
508 static u_int
509 llan_set_maddr(void *arg, struct sockaddr_dl *sdl, u_int cnt)
510 {
511 	struct llan_softc *sc = arg;
512 	uint64_t macaddr = 0;
513 
514 	memcpy((uint8_t *)&macaddr + 2, LLADDR(sdl), 6);
515 	phyp_hcall(H_MULTICAST_CTRL, sc->unit, LLAN_ADD_MULTICAST, macaddr);
516 
517 	return (1);
518 }
519 
520 static int
521 llan_set_multicast(struct llan_softc *sc)
522 {
523 	struct ifnet *ifp = sc->ifp;
524 
525 	mtx_assert(&sc->io_lock, MA_OWNED);
526 
527 	phyp_hcall(H_MULTICAST_CTRL, sc->unit, LLAN_CLEAR_MULTICAST, 0);
528 
529 	if_foreach_llmaddr(ifp, llan_set_maddr, sc);
530 
531 	return (0);
532 }
533 
534 static int
535 llan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
536 {
537 	int err = 0;
538 	struct llan_softc *sc = if_getsoftc(ifp);
539 
540 	switch (cmd) {
541 	case SIOCADDMULTI:
542 	case SIOCDELMULTI:
543 		mtx_lock(&sc->io_lock);
544 		if ((if_getdrvflags(sc->ifp) & IFF_DRV_RUNNING) != 0)
545 			llan_set_multicast(sc);
546 		mtx_unlock(&sc->io_lock);
547 		break;
548 	case SIOCGIFMEDIA:
549 	case SIOCSIFMEDIA:
550 		err = ifmedia_ioctl(ifp, (struct ifreq *)data, &sc->media, cmd);
551 		break;
552 	case SIOCSIFFLAGS:
553 	default:
554 		err = ether_ioctl(ifp, cmd, data);
555 		break;
556 	}
557 
558 	return (err);
559 }
560