2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright 2013 Nathan Whitehorn
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/sockio.h>
35 #include <sys/endian.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>
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>
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>
60 #include <powerpc/pseries/phyp-hvcall.h>
62 #define LLAN_MAX_RX_PACKETS 100
63 #define LLAN_MAX_TX_PACKETS 100
64 #define LLAN_RX_BUF_LEN 8*PAGE_SIZE
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
73 bus_dmamap_t rx_dmamap;
77 struct llan_receive_queue_entry { /* PAPR page 539 */
90 uint8_t mac_address[8];
98 bus_dma_tag_t rx_dma_tag;
99 bus_dma_tag_t rxbuf_dma_tag;
100 bus_dma_tag_t tx_dma_tag;
102 bus_dmamap_t tx_dma_map;
104 struct llan_receive_queue_entry *rx_buf;
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];
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,
127 static int llan_add_rxbuf(struct llan_softc *sc, struct llan_xfer *rx);
128 static int llan_set_multicast(struct llan_softc *sc);
130 static devclass_t llan_devclass;
131 static device_method_t llan_methods[] = {
132 DEVMETHOD(device_probe, llan_probe),
133 DEVMETHOD(device_attach, llan_attach),
137 static driver_t llan_driver = {
140 sizeof(struct llan_softc)
142 DRIVER_MODULE(llan, vdevice, llan_driver, llan_devclass, 0, 0);
145 llan_probe(device_t dev)
147 if (!ofw_bus_is_compatible(dev,"IBM,l-lan"))
150 device_set_desc(dev, "POWER Hypervisor Virtual Ethernet");
155 llan_attach(device_t dev)
157 struct llan_softc *sc;
162 sc = device_get_softc(dev);
165 /* Get firmware properties */
166 node = ofw_bus_get_node(dev);
167 len = OF_getprop(node, "local-mac-address", sc->mac_address,
168 sizeof(sc->mac_address));
169 /* If local-mac-address property has only 6 bytes (ETHER_ADDR_LEN)
170 * instead of 8 (sizeof(sc->mac_address)), then its value must be
171 * shifted 2 bytes to the right. */
172 if (len == ETHER_ADDR_LEN) {
173 bcopy(sc->mac_address, &sc->mac_address[2], len);
174 /* Zero out the first 2 bytes. */
175 bzero(sc->mac_address, 2);
177 OF_getencprop(node, "reg", &sc->unit, sizeof(sc->unit));
179 mtx_init(&sc->io_lock, "llan", NULL, MTX_DEF);
181 /* Setup interrupt */
183 sc->irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &sc->irqid,
187 device_printf(dev, "Could not allocate IRQ\n");
188 mtx_destroy(&sc->io_lock);
192 bus_setup_intr(dev, sc->irq, INTR_TYPE_NET | INTR_MPSAFE |
193 INTR_ENTROPY, NULL, llan_intr, sc, &sc->irq_cookie);
196 bus_dma_tag_create(bus_get_dma_tag(dev), 16, 0,
197 BUS_SPACE_MAXADDR, BUS_SPACE_MAXADDR, NULL, NULL,
198 LLAN_RX_BUF_LEN, 1, BUS_SPACE_MAXSIZE_32BIT,
199 0, NULL, NULL, &sc->rx_dma_tag);
200 bus_dma_tag_create(bus_get_dma_tag(dev), 4, 0,
201 BUS_SPACE_MAXADDR, BUS_SPACE_MAXADDR, NULL, NULL,
202 BUS_SPACE_MAXSIZE, 1, BUS_SPACE_MAXSIZE_32BIT,
203 0, NULL, NULL, &sc->rxbuf_dma_tag);
204 bus_dma_tag_create(bus_get_dma_tag(dev), 1, 0,
205 BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, NULL, NULL,
206 BUS_SPACE_MAXSIZE, 6, BUS_SPACE_MAXSIZE_32BIT, 0,
207 busdma_lock_mutex, &sc->io_lock, &sc->tx_dma_tag);
209 bus_dmamem_alloc(sc->rx_dma_tag, (void **)&sc->rx_buf,
210 BUS_DMA_WAITOK | BUS_DMA_ZERO, &sc->rx_buf_map);
211 bus_dmamap_load(sc->rx_dma_tag, sc->rx_buf_map, sc->rx_buf,
212 LLAN_RX_BUF_LEN, llan_rx_load_cb, sc, 0);
215 bus_dmamap_create(sc->tx_dma_tag, 0, &sc->tx_dma_map);
218 for (i = 0; i < LLAN_MAX_RX_PACKETS; i++) {
219 bus_dmamap_create(sc->rxbuf_dma_tag, 0,
220 &sc->rx_xfer[i].rx_dmamap);
221 sc->rx_xfer[i].rx_mbuf = NULL;
224 /* Attach to network stack */
225 sc->ifp = if_alloc(IFT_ETHER);
226 sc->ifp->if_softc = sc;
228 if_initname(sc->ifp, device_get_name(dev), device_get_unit(dev));
229 sc->ifp->if_mtu = ETHERMTU; /* XXX max-frame-size from OF? */
230 sc->ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
231 sc->ifp->if_hwassist = 0; /* XXX: ibm,illan-options */
232 sc->ifp->if_capabilities = 0;
233 sc->ifp->if_capenable = 0;
234 sc->ifp->if_start = llan_start;
235 sc->ifp->if_ioctl = llan_ioctl;
236 sc->ifp->if_init = llan_init;
238 ifmedia_init(&sc->media, IFM_IMASK, llan_media_change,
240 ifmedia_add(&sc->media, IFM_ETHER | IFM_AUTO, 0, NULL);
241 ifmedia_set(&sc->media, IFM_ETHER | IFM_AUTO);
243 IFQ_SET_MAXLEN(&sc->ifp->if_snd, LLAN_MAX_TX_PACKETS);
244 sc->ifp->if_snd.ifq_drv_maxlen = LLAN_MAX_TX_PACKETS;
245 IFQ_SET_READY(&sc->ifp->if_snd);
247 ether_ifattach(sc->ifp, &sc->mac_address[2]);
249 /* We don't have link state reporting, so make it always up */
250 if_link_state_change(sc->ifp, LINK_STATE_UP);
256 llan_media_change(struct ifnet *ifp)
258 struct llan_softc *sc = ifp->if_softc;
260 if (IFM_TYPE(sc->media.ifm_media) != IFM_ETHER)
263 if (IFM_SUBTYPE(sc->media.ifm_media) != IFM_AUTO)
270 llan_media_status(struct ifnet *ifp, struct ifmediareq *ifmr)
273 ifmr->ifm_status = IFM_AVALID | IFM_ACTIVE | IFM_UNKNOWN | IFM_FDX;
274 ifmr->ifm_active = IFM_ETHER;
278 llan_rx_load_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int err)
280 struct llan_softc *sc = xsc;
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;
291 struct llan_softc *sc = xsc;
292 uint64_t rx_buf_desc;
296 mtx_lock(&sc->io_lock);
298 phyp_hcall(H_FREE_LOGICAL_LAN, sc->unit);
300 /* Create buffers (page 539) */
302 sc->rx_valid_val = 1;
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);
311 for (i = 0; i < LLAN_MAX_RX_PACKETS; i++)
312 llan_add_rxbuf(sc, &sc->rx_xfer[i]);
314 phyp_hcall(H_VIO_SIGNAL, sc->unit, 1); /* Enable interrupts */
316 /* Tell stack we're up */
317 sc->ifp->if_drv_flags |= IFF_DRV_RUNNING;
318 sc->ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
320 mtx_unlock(&sc->io_lock);
322 /* Check for pending receives scheduled before interrupt enable */
327 llan_add_rxbuf(struct llan_softc *sc, struct llan_xfer *rx)
330 bus_dma_segment_t segs[1];
333 mtx_assert(&sc->io_lock, MA_OWNED);
335 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
339 m->m_len = m->m_pkthdr.len = m->m_ext.ext_size;
340 if (rx->rx_mbuf != NULL) {
341 bus_dmamap_sync(sc->rxbuf_dma_tag, rx->rx_dmamap,
342 BUS_DMASYNC_POSTREAD);
343 bus_dmamap_unload(sc->rxbuf_dma_tag, rx->rx_dmamap);
346 /* Save pointer to buffer structure */
347 m_copyback(m, 0, 8, (void *)&rx);
349 error = bus_dmamap_load_mbuf_sg(sc->rxbuf_dma_tag, rx->rx_dmamap, m,
350 segs, &nsegs, BUS_DMA_NOWAIT);
352 device_printf(sc->dev,
353 "cannot load RX DMA map %p, error = %d\n", rx, error);
358 /* If nsegs is wrong then the stack is corrupt. */
360 ("%s: too many DMA segments (%d)", __func__, nsegs));
363 bus_dmamap_sync(sc->rxbuf_dma_tag, rx->rx_dmamap, BUS_DMASYNC_PREREAD);
365 rx->rx_bufdesc = LLAN_BUFDESC_VALID;
366 rx->rx_bufdesc |= (((uint64_t)segs[0].ds_len) << 32);
367 rx->rx_bufdesc |= segs[0].ds_addr;
368 error = phyp_hcall(H_ADD_LOGICAL_LAN_BUFFER, sc->unit, rx->rx_bufdesc);
381 struct llan_softc *sc = xsc;
382 struct llan_xfer *rx;
385 mtx_lock(&sc->io_lock);
387 phyp_hcall(H_VIO_SIGNAL, sc->unit, 0);
389 while ((sc->rx_buf[sc->rx_dma_slot].control >> 7) == sc->rx_valid_val) {
390 rx = (struct llan_xfer *)sc->rx_buf[sc->rx_dma_slot].handle;
392 m_adj(m, sc->rx_buf[sc->rx_dma_slot].offset - 8);
393 m->m_len = sc->rx_buf[sc->rx_dma_slot].length;
395 /* llan_add_rxbuf does DMA sync and unload as well as requeue */
396 if (llan_add_rxbuf(sc, rx) != 0) {
397 if_inc_counter(sc->ifp, IFCOUNTER_IERRORS, 1);
401 if_inc_counter(sc->ifp, IFCOUNTER_IPACKETS, 1);
402 m_adj(m, sc->rx_buf[sc->rx_dma_slot].offset);
403 m->m_len = sc->rx_buf[sc->rx_dma_slot].length;
404 m->m_pkthdr.rcvif = sc->ifp;
405 m->m_pkthdr.len = m->m_len;
408 if (sc->rx_dma_slot >= sc->rx_buf_len/sizeof(sc->rx_buf[0])) {
410 sc->rx_valid_val = !sc->rx_valid_val;
413 mtx_unlock(&sc->io_lock);
414 (*sc->ifp->if_input)(sc->ifp, m);
415 mtx_lock(&sc->io_lock);
418 phyp_hcall(H_VIO_SIGNAL, sc->unit, 1);
421 * H_VIO_SIGNAL enables interrupts for future packets only.
422 * Make sure none were queued between the end of the loop and the
423 * enable interrupts call.
425 if ((sc->rx_buf[sc->rx_dma_slot].control >> 7) == sc->rx_valid_val)
428 mtx_unlock(&sc->io_lock);
432 llan_send_packet(void *xsc, bus_dma_segment_t *segs, int nsegs,
433 bus_size_t mapsize, int error)
435 struct llan_softc *sc = xsc;
436 uint64_t bufdescs[6];
439 bzero(bufdescs, sizeof(bufdescs));
441 for (i = 0; i < nsegs; i++) {
442 bufdescs[i] = LLAN_BUFDESC_VALID;
443 bufdescs[i] |= (((uint64_t)segs[i].ds_len) << 32);
444 bufdescs[i] |= segs[i].ds_addr;
447 err = phyp_hcall(H_SEND_LOGICAL_LAN, sc->unit, bufdescs[0],
448 bufdescs[1], bufdescs[2], bufdescs[3], bufdescs[4], bufdescs[5], 0);
450 * The hypercall returning implies completion -- or that the call will
451 * not complete. In principle, we should try a few times if we get back
452 * H_BUSY based on the continuation token in R4. For now, just drop
453 * the packet in such cases.
455 if (err == H_SUCCESS)
456 if_inc_counter(sc->ifp, IFCOUNTER_OPACKETS, 1);
458 if_inc_counter(sc->ifp, IFCOUNTER_OERRORS, 1);
462 llan_start_locked(struct ifnet *ifp)
464 struct llan_softc *sc = ifp->if_softc;
466 struct mbuf *mb_head, *m;
468 mtx_assert(&sc->io_lock, MA_OWNED);
470 if ((ifp->if_drv_flags & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) !=
474 while (!IFQ_DRV_IS_EMPTY(&ifp->if_snd)) {
475 IFQ_DRV_DEQUEUE(&ifp->if_snd, mb_head);
480 BPF_MTAP(ifp, mb_head);
482 for (m = mb_head, nsegs = 0; m != NULL; m = m->m_next)
485 m = m_collapse(mb_head, M_NOWAIT, 6);
492 bus_dmamap_load_mbuf(sc->tx_dma_tag, sc->tx_dma_map,
493 mb_head, llan_send_packet, sc, 0);
494 bus_dmamap_unload(sc->tx_dma_tag, sc->tx_dma_map);
500 llan_start(struct ifnet *ifp)
502 struct llan_softc *sc = ifp->if_softc;
504 mtx_lock(&sc->io_lock);
505 llan_start_locked(ifp);
506 mtx_unlock(&sc->io_lock);
510 llan_set_maddr(void *arg, struct sockaddr_dl *sdl, u_int cnt)
512 struct llan_softc *sc = arg;
513 uint64_t macaddr = 0;
515 memcpy((uint8_t *)&macaddr + 2, LLADDR(sdl), 6);
516 phyp_hcall(H_MULTICAST_CTRL, sc->unit, LLAN_ADD_MULTICAST, macaddr);
522 llan_set_multicast(struct llan_softc *sc)
524 struct ifnet *ifp = sc->ifp;
526 mtx_assert(&sc->io_lock, MA_OWNED);
528 phyp_hcall(H_MULTICAST_CTRL, sc->unit, LLAN_CLEAR_MULTICAST, 0);
530 if_foreach_llmaddr(ifp, llan_set_maddr, sc);
536 llan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
539 struct llan_softc *sc = ifp->if_softc;
544 mtx_lock(&sc->io_lock);
545 if ((sc->ifp->if_drv_flags & IFF_DRV_RUNNING) != 0)
546 llan_set_multicast(sc);
547 mtx_unlock(&sc->io_lock);
551 err = ifmedia_ioctl(ifp, (struct ifreq *)data, &sc->media, cmd);
555 err = ether_ioctl(ifp, cmd, data);