xref: /freebsd/sys/powerpc/pseries/phyp_llan.c (revision 1f4bcc459a76b7aa664f3fd557684cd0ba6da352) 
1 /*-
2  * Copyright 2013 Nathan Whitehorn
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  */
26 
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29 
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/sockio.h>
33 #include <sys/endian.h>
34 #include <sys/lock.h>
35 #include <sys/mbuf.h>
36 #include <sys/module.h>
37 #include <sys/malloc.h>
38 #include <sys/mutex.h>
39 #include <sys/kernel.h>
40 #include <sys/socket.h>
41 
42 #include <net/bpf.h>
43 #include <net/if.h>
44 #include <net/if_var.h>
45 #include <net/ethernet.h>
46 #include <net/if_dl.h>
47 #include <net/if_media.h>
48 #include <net/if_types.h>
49 
50 #include <dev/ofw/openfirm.h>
51 #include <dev/ofw/ofw_bus.h>
52 #include <dev/ofw/ofw_bus_subr.h>
53 #include <machine/bus.h>
54 #include <machine/resource.h>
55 #include <sys/bus.h>
56 #include <sys/rman.h>
57 
58 #include <powerpc/pseries/phyp-hvcall.h>
59 
60 #define LLAN_MAX_RX_PACKETS	100
61 #define LLAN_MAX_TX_PACKETS	100
62 #define LLAN_RX_BUF_LEN		8*PAGE_SIZE
63 
64 #define LLAN_BUFDESC_VALID	(1ULL << 63)
65 #define LLAN_ADD_MULTICAST	0x1
66 #define LLAN_DEL_MULTICAST	0x2
67 #define LLAN_CLEAR_MULTICAST	0x3
68 
69 struct llan_xfer {
70 	struct mbuf *rx_mbuf;
71 	bus_dmamap_t rx_dmamap;
72 	uint64_t rx_bufdesc;
73 };
74 
75 struct llan_receive_queue_entry { /* PAPR page 539 */
76 	uint8_t control;
77 	uint8_t reserved;
78 	uint16_t offset;
79 	uint32_t length;
80 	uint64_t handle;
81 } __packed;
82 
83 struct llan_softc {
84 	device_t	dev;
85 	struct mtx	io_lock;
86 
87 	cell_t		unit;
88 	uint8_t		mac_address[8];
89 
90 	struct ifmedia	media;
91 
92 	int		irqid;
93 	struct resource	*irq;
94 	void		*irq_cookie;
95 
96 	bus_dma_tag_t	rx_dma_tag;
97 	bus_dma_tag_t	rxbuf_dma_tag;
98 	bus_dma_tag_t	tx_dma_tag;
99 
100 	bus_dmamap_t	tx_dma_map;
101 
102 	struct llan_receive_queue_entry *rx_buf;
103 	int		rx_dma_slot;
104 	int		rx_valid_val;
105 	bus_dmamap_t	rx_buf_map;
106 	bus_addr_t	rx_buf_phys;
107 	bus_size_t	rx_buf_len;
108 	bus_addr_t	input_buf_phys;
109 	bus_addr_t	filter_buf_phys;
110 	struct llan_xfer rx_xfer[LLAN_MAX_RX_PACKETS];
111 
112 	struct ifnet	*ifp;
113 };
114 
115 static int	llan_probe(device_t);
116 static int	llan_attach(device_t);
117 static void	llan_intr(void *xsc);
118 static void	llan_init(void *xsc);
119 static void	llan_start(struct ifnet *ifp);
120 static int	llan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
121 static void	llan_media_status(struct ifnet *ifp, struct ifmediareq *ifmr);
122 static int	llan_media_change(struct ifnet *ifp);
123 static void	llan_rx_load_cb(void *xsc, bus_dma_segment_t *segs, int nsegs,
124 		    int err);
125 static int	llan_add_rxbuf(struct llan_softc *sc, struct llan_xfer *rx);
126 static int	llan_set_multicast(struct llan_softc *sc);
127 
128 static devclass_t       llan_devclass;
129 static device_method_t  llan_methods[] = {
130         DEVMETHOD(device_probe,         llan_probe),
131         DEVMETHOD(device_attach,        llan_attach),
132 
133         DEVMETHOD_END
134 };
135 static driver_t llan_driver = {
136         "llan",
137         llan_methods,
138         sizeof(struct llan_softc)
139 };
140 DRIVER_MODULE(llan, vdevice, llan_driver, llan_devclass, 0, 0);
141 
142 static int
143 llan_probe(device_t dev)
144 {
145 	if (!ofw_bus_is_compatible(dev,"IBM,l-lan"))
146 		return (ENXIO);
147 
148 	device_set_desc(dev, "POWER Hypervisor Virtual Ethernet");
149 	return (0);
150 }
151 
152 static int
153 llan_attach(device_t dev)
154 {
155 	struct llan_softc *sc;
156 	phandle_t node;
157 	int error, i;
158 
159 	sc = device_get_softc(dev);
160 	sc->dev = dev;
161 
162 	/* Get firmware properties */
163 	node = ofw_bus_get_node(dev);
164 	OF_getprop(node, "local-mac-address", sc->mac_address,
165 	    sizeof(sc->mac_address));
166 	OF_getencprop(node, "reg", &sc->unit, sizeof(sc->unit));
167 
168 	mtx_init(&sc->io_lock, "llan", NULL, MTX_DEF);
169 
170         /* Setup interrupt */
171 	sc->irqid = 0;
172 	sc->irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &sc->irqid,
173 	    RF_ACTIVE);
174 
175 	if (!sc->irq) {
176 		device_printf(dev, "Could not allocate IRQ\n");
177 		mtx_destroy(&sc->io_lock);
178 		return (ENXIO);
179 	}
180 
181 	bus_setup_intr(dev, sc->irq, INTR_TYPE_MISC | INTR_MPSAFE |
182 	    INTR_ENTROPY, NULL, llan_intr, sc, &sc->irq_cookie);
183 
184 	/* Setup DMA */
185 	error = bus_dma_tag_create(bus_get_dma_tag(dev), 16, 0,
186             BUS_SPACE_MAXADDR, BUS_SPACE_MAXADDR, NULL, NULL,
187 	    LLAN_RX_BUF_LEN, 1, BUS_SPACE_MAXSIZE_32BIT,
188 	    0, NULL, NULL, &sc->rx_dma_tag);
189 	error = bus_dma_tag_create(bus_get_dma_tag(dev), 4, 0,
190             BUS_SPACE_MAXADDR, BUS_SPACE_MAXADDR, NULL, NULL,
191 	    BUS_SPACE_MAXSIZE, 1, BUS_SPACE_MAXSIZE_32BIT,
192 	    0, NULL, NULL, &sc->rxbuf_dma_tag);
193 	error = bus_dma_tag_create(bus_get_dma_tag(dev), 1, 0,
194             BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, NULL, NULL,
195 	    BUS_SPACE_MAXSIZE, 6, BUS_SPACE_MAXSIZE_32BIT, 0,
196 	    busdma_lock_mutex, &sc->io_lock, &sc->tx_dma_tag);
197 
198 	error = bus_dmamem_alloc(sc->rx_dma_tag, (void **)&sc->rx_buf,
199 	    BUS_DMA_WAITOK | BUS_DMA_ZERO, &sc->rx_buf_map);
200 	error = bus_dmamap_load(sc->rx_dma_tag, sc->rx_buf_map, sc->rx_buf,
201 	    LLAN_RX_BUF_LEN, llan_rx_load_cb, sc, 0);
202 
203 	/* TX DMA maps */
204 	bus_dmamap_create(sc->tx_dma_tag, 0, &sc->tx_dma_map);
205 
206 	/* RX DMA */
207 	for (i = 0; i < LLAN_MAX_RX_PACKETS; i++) {
208 		error = bus_dmamap_create(sc->rxbuf_dma_tag, 0,
209 		    &sc->rx_xfer[i].rx_dmamap);
210 		sc->rx_xfer[i].rx_mbuf = NULL;
211 	}
212 
213 	/* Attach to network stack */
214 	sc->ifp = if_alloc(IFT_ETHER);
215 	sc->ifp->if_softc = sc;
216 
217 	if_initname(sc->ifp, device_get_name(dev), device_get_unit(dev));
218 	sc->ifp->if_mtu = ETHERMTU; /* XXX max-frame-size from OF? */
219 	sc->ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
220 	sc->ifp->if_hwassist = 0; /* XXX: ibm,illan-options */
221 	sc->ifp->if_capabilities = 0;
222 	sc->ifp->if_capenable = 0;
223 	sc->ifp->if_start = llan_start;
224 	sc->ifp->if_ioctl = llan_ioctl;
225 	sc->ifp->if_init = llan_init;
226 
227 	ifmedia_init(&sc->media, IFM_IMASK, llan_media_change,
228 	    llan_media_status);
229 	ifmedia_add(&sc->media, IFM_ETHER | IFM_AUTO, 0, NULL);
230 	ifmedia_set(&sc->media, IFM_ETHER | IFM_AUTO);
231 
232 	IFQ_SET_MAXLEN(&sc->ifp->if_snd, LLAN_MAX_TX_PACKETS);
233 	sc->ifp->if_snd.ifq_drv_maxlen = LLAN_MAX_TX_PACKETS;
234 	IFQ_SET_READY(&sc->ifp->if_snd);
235 
236 	ether_ifattach(sc->ifp, &sc->mac_address[2]);
237 
238 	/* We don't have link state reporting, so make it always up */
239 	if_link_state_change(sc->ifp, LINK_STATE_UP);
240 
241 	return (0);
242 }
243 
244 static int
245 llan_media_change(struct ifnet *ifp)
246 {
247 	struct llan_softc *sc = ifp->if_softc;
248 
249 	if (IFM_TYPE(sc->media.ifm_media) != IFM_ETHER)
250 		return (EINVAL);
251 
252 	if (IFM_SUBTYPE(sc->media.ifm_media) != IFM_AUTO)
253 		return (EINVAL);
254 
255 	return (0);
256 }
257 
258 static void
259 llan_media_status(struct ifnet *ifp, struct ifmediareq *ifmr)
260 {
261 
262 	ifmr->ifm_status = IFM_AVALID | IFM_ACTIVE | IFM_UNKNOWN | IFM_FDX;
263 	ifmr->ifm_active = IFM_ETHER;
264 }
265 
266 static void
267 llan_rx_load_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int err)
268 {
269 	struct llan_softc *sc = xsc;
270 
271 	sc->rx_buf_phys = segs[0].ds_addr;
272 	sc->rx_buf_len = segs[0].ds_len - 2*PAGE_SIZE;
273 	sc->input_buf_phys = segs[0].ds_addr + segs[0].ds_len - PAGE_SIZE;
274 	sc->filter_buf_phys = segs[0].ds_addr + segs[0].ds_len - 2*PAGE_SIZE;
275 }
276 
277 static void
278 llan_init(void *xsc)
279 {
280 	struct llan_softc *sc = xsc;
281 	uint64_t rx_buf_desc;
282 	uint64_t macaddr;
283 	int err, i;
284 
285 	mtx_lock(&sc->io_lock);
286 
287 	phyp_hcall(H_FREE_LOGICAL_LAN, sc->unit);
288 
289 	/* Create buffers (page 539) */
290 	sc->rx_dma_slot = 0;
291 	sc->rx_valid_val = 1;
292 
293 	rx_buf_desc = LLAN_BUFDESC_VALID;
294 	rx_buf_desc |= (sc->rx_buf_len << 32);
295 	rx_buf_desc |= sc->rx_buf_phys;
296 	memcpy(&macaddr, sc->mac_address, 8);
297 	err = phyp_hcall(H_REGISTER_LOGICAL_LAN, sc->unit, sc->input_buf_phys,
298 	    rx_buf_desc, sc->filter_buf_phys, macaddr);
299 
300 	for (i = 0; i < LLAN_MAX_RX_PACKETS; i++)
301 		llan_add_rxbuf(sc, &sc->rx_xfer[i]);
302 
303 	phyp_hcall(H_VIO_SIGNAL, sc->unit, 1); /* Enable interrupts */
304 
305 	/* Tell stack we're up */
306 	sc->ifp->if_drv_flags |= IFF_DRV_RUNNING;
307 	sc->ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
308 
309 	mtx_unlock(&sc->io_lock);
310 
311 	/* Check for pending receives scheduled before interrupt enable */
312 	llan_intr(sc);
313 }
314 
315 static int
316 llan_add_rxbuf(struct llan_softc *sc, struct llan_xfer *rx)
317 {
318 	struct mbuf *m;
319 	bus_dma_segment_t segs[1];
320 	int error, nsegs;
321 
322 	mtx_assert(&sc->io_lock, MA_OWNED);
323 
324 	m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
325 	if (m == NULL)
326 		return (ENOBUFS);
327 
328 	m->m_len = m->m_pkthdr.len = m->m_ext.ext_size;
329 	if (rx->rx_mbuf != NULL) {
330 		bus_dmamap_sync(sc->rxbuf_dma_tag, rx->rx_dmamap,
331 		    BUS_DMASYNC_POSTREAD);
332 		bus_dmamap_unload(sc->rxbuf_dma_tag, rx->rx_dmamap);
333 	}
334 
335 	/* Save pointer to buffer structure */
336 	m_copyback(m, 0, 8, (void *)&rx);
337 
338 	error = bus_dmamap_load_mbuf_sg(sc->rxbuf_dma_tag, rx->rx_dmamap, m,
339 	    segs, &nsegs, BUS_DMA_NOWAIT);
340 	if (error != 0) {
341 		device_printf(sc->dev,
342 		    "cannot load RX DMA map %p, error = %d\n", rx, error);
343 		m_freem(m);
344 		return (error);
345 	}
346 
347 	/* If nsegs is wrong then the stack is corrupt. */
348 	KASSERT(nsegs == 1,
349 	    ("%s: too many DMA segments (%d)", __func__, nsegs));
350 	rx->rx_mbuf = m;
351 
352 	bus_dmamap_sync(sc->rxbuf_dma_tag, rx->rx_dmamap, BUS_DMASYNC_PREREAD);
353 
354 	rx->rx_bufdesc = LLAN_BUFDESC_VALID;
355 	rx->rx_bufdesc |= (((uint64_t)segs[0].ds_len) << 32);
356 	rx->rx_bufdesc |= segs[0].ds_addr;
357 	error = phyp_hcall(H_ADD_LOGICAL_LAN_BUFFER, sc->unit, rx->rx_bufdesc);
358 	if (error != 0) {
359 		m_freem(m);
360 		rx->rx_mbuf = NULL;
361 		return (ENOBUFS);
362 	}
363 
364         return (0);
365 }
366 
367 static void
368 llan_intr(void *xsc)
369 {
370 	struct llan_softc *sc = xsc;
371 	struct llan_xfer *rx;
372 	struct mbuf *m;
373 
374 	mtx_lock(&sc->io_lock);
375 restart:
376 	phyp_hcall(H_VIO_SIGNAL, sc->unit, 0);
377 
378 	while ((sc->rx_buf[sc->rx_dma_slot].control >> 7) == sc->rx_valid_val) {
379 		rx = (struct llan_xfer *)sc->rx_buf[sc->rx_dma_slot].handle;
380 		m = rx->rx_mbuf;
381 		m_adj(m, sc->rx_buf[sc->rx_dma_slot].offset - 8);
382 		m->m_len = sc->rx_buf[sc->rx_dma_slot].length;
383 
384 		/* llan_add_rxbuf does DMA sync and unload as well as requeue */
385 		if (llan_add_rxbuf(sc, rx) != 0) {
386 			if_inc_counter(sc->ifp, IFCOUNTER_IERRORS, 1);
387 			phyp_hcall(H_ADD_LOGICAL_LAN_BUFFER, sc->unit,
388 			    rx->rx_bufdesc);
389 			continue;
390 		}
391 
392 		if_inc_counter(sc->ifp, IFCOUNTER_IPACKETS, 1);
393 		m_adj(m, sc->rx_buf[sc->rx_dma_slot].offset);
394 		m->m_len = sc->rx_buf[sc->rx_dma_slot].length;
395 		m->m_pkthdr.rcvif = sc->ifp;
396 		m->m_pkthdr.len = m->m_len;
397 		sc->rx_dma_slot++;
398 
399 		if (sc->rx_dma_slot >= sc->rx_buf_len/sizeof(sc->rx_buf[0])) {
400 			sc->rx_dma_slot = 0;
401 			sc->rx_valid_val = !sc->rx_valid_val;
402 		}
403 
404 		mtx_unlock(&sc->io_lock);
405 		(*sc->ifp->if_input)(sc->ifp, m);
406 		mtx_lock(&sc->io_lock);
407 	}
408 
409 	phyp_hcall(H_VIO_SIGNAL, sc->unit, 1);
410 
411 	/*
412 	 * H_VIO_SIGNAL enables interrupts for future packets only.
413 	 * Make sure none were queued between the end of the loop and the
414 	 * enable interrupts call.
415 	 */
416 	if ((sc->rx_buf[sc->rx_dma_slot].control >> 7) == sc->rx_valid_val)
417 		goto restart;
418 
419 	mtx_unlock(&sc->io_lock);
420 }
421 
422 static void
423 llan_send_packet(void *xsc, bus_dma_segment_t *segs, int nsegs,
424     bus_size_t mapsize, int error)
425 {
426 	struct llan_softc *sc = xsc;
427 	uint64_t bufdescs[6];
428 	int i;
429 
430 	bzero(bufdescs, sizeof(bufdescs));
431 
432 	for (i = 0; i < nsegs; i++) {
433 		bufdescs[i] = LLAN_BUFDESC_VALID;
434 		bufdescs[i] |= (((uint64_t)segs[i].ds_len) << 32);
435 		bufdescs[i] |= segs[i].ds_addr;
436 	}
437 
438 	phyp_hcall(H_SEND_LOGICAL_LAN, sc->unit, bufdescs[0],
439 	    bufdescs[1], bufdescs[2], bufdescs[3], bufdescs[4], bufdescs[5], 0);
440 	/*
441 	 * The hypercall returning implies completion -- or that the call will
442 	 * not complete. In principle, we should try a few times if we get back
443 	 * H_BUSY based on the continuation token in R4. For now, just drop
444 	 * the packet in such cases.
445 	 */
446 }
447 
448 static void
449 llan_start_locked(struct ifnet *ifp)
450 {
451 	struct llan_softc *sc = ifp->if_softc;
452 	bus_addr_t first;
453 	int nsegs;
454 	struct mbuf *mb_head, *m;
455 
456 	mtx_assert(&sc->io_lock, MA_OWNED);
457 	first = 0;
458 
459 	if ((ifp->if_drv_flags & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) !=
460 	    IFF_DRV_RUNNING)
461 		return;
462 
463 	while (!IFQ_DRV_IS_EMPTY(&ifp->if_snd)) {
464 		IFQ_DRV_DEQUEUE(&ifp->if_snd, mb_head);
465 
466 		if (mb_head == NULL)
467 			break;
468 
469 		BPF_MTAP(ifp, mb_head);
470 
471 		for (m = mb_head, nsegs = 0; m != NULL; m = m->m_next)
472 			nsegs++;
473 		if (nsegs > 6) {
474 			m = m_collapse(mb_head, M_NOWAIT, 6);
475 			if (m == NULL) {
476 				m_freem(mb_head);
477 				continue;
478 			}
479 		}
480 
481 		bus_dmamap_load_mbuf(sc->tx_dma_tag, sc->tx_dma_map,
482 			mb_head, llan_send_packet, sc, 0);
483 		bus_dmamap_unload(sc->tx_dma_tag, sc->tx_dma_map);
484 		m_freem(mb_head);
485 	}
486 }
487 
488 static void
489 llan_start(struct ifnet *ifp)
490 {
491 	struct llan_softc *sc = ifp->if_softc;
492 
493 	mtx_lock(&sc->io_lock);
494 	llan_start_locked(ifp);
495 	mtx_unlock(&sc->io_lock);
496 }
497 
498 static int
499 llan_set_multicast(struct llan_softc *sc)
500 {
501 	struct ifnet *ifp = sc->ifp;
502 	struct ifmultiaddr *inm;
503 	uint64_t macaddr;
504 
505 	mtx_assert(&sc->io_lock, MA_OWNED);
506 
507 	phyp_hcall(H_MULTICAST_CTRL, sc->unit, LLAN_CLEAR_MULTICAST, 0);
508 
509 	if_maddr_rlock(ifp);
510 	TAILQ_FOREACH(inm, &ifp->if_multiaddrs, ifma_link) {
511 		if (inm->ifma_addr->sa_family != AF_LINK)
512 			continue;
513 
514 		memcpy((uint8_t *)&macaddr + 2,
515 		    LLADDR((struct sockaddr_dl *)inm->ifma_addr), 6);
516 		phyp_hcall(H_MULTICAST_CTRL, sc->unit, LLAN_ADD_MULTICAST,
517 		    macaddr);
518 	}
519 	if_maddr_runlock(ifp);
520 
521 	return (0);
522 }
523 
524 static int
525 llan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
526 {
527 	int err = 0;
528 	struct llan_softc *sc = ifp->if_softc;
529 
530 	switch (cmd) {
531 	case SIOCADDMULTI:
532 	case SIOCDELMULTI:
533 		mtx_lock(&sc->io_lock);
534 		if ((sc->ifp->if_drv_flags & IFF_DRV_RUNNING) != 0)
535 			llan_set_multicast(sc);
536 		mtx_unlock(&sc->io_lock);
537 		break;
538 	case SIOCGIFMEDIA:
539 	case SIOCSIFMEDIA:
540 		err = ifmedia_ioctl(ifp, (struct ifreq *)data, &sc->media, cmd);
541 		break;
542 	case SIOCSIFFLAGS:
543 	default:
544 		err = ether_ioctl(ifp, cmd, data);
545 		break;
546 	}
547 
548 	return (err);
549 }
550 
551