2 * Copyright 2013 Nathan Whitehorn
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/sockio.h>
33 #include <sys/endian.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>
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>
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>
58 #include <powerpc/pseries/phyp-hvcall.h>
60 #define LLAN_MAX_RX_PACKETS 100
61 #define LLAN_MAX_TX_PACKETS 100
62 #define LLAN_RX_BUF_LEN 8*PAGE_SIZE
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
71 bus_dmamap_t rx_dmamap;
75 struct llan_receive_queue_entry { /* PAPR page 539 */
88 uint8_t mac_address[8];
94 bus_dma_tag_t rx_dma_tag;
95 bus_dma_tag_t rxbuf_dma_tag;
96 bus_dma_tag_t tx_dma_tag;
98 bus_dmamap_t tx_dma_map;
100 struct llan_receive_queue_entry *rx_buf;
103 bus_dmamap_t rx_buf_map;
104 bus_addr_t rx_buf_phys;
105 bus_size_t rx_buf_len;
106 bus_addr_t input_buf_phys;
107 bus_addr_t filter_buf_phys;
108 struct llan_xfer rx_xfer[LLAN_MAX_RX_PACKETS];
113 static int llan_probe(device_t);
114 static int llan_attach(device_t);
115 static void llan_intr(void *xsc);
116 static void llan_init(void *xsc);
117 static void llan_start(struct ifnet *ifp);
118 static int llan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
119 static void llan_rx_load_cb(void *xsc, bus_dma_segment_t *segs, int nsegs,
121 static int llan_add_rxbuf(struct llan_softc *sc, struct llan_xfer *rx);
122 static int llan_set_multicast(struct llan_softc *sc);
124 static devclass_t llan_devclass;
125 static device_method_t llan_methods[] = {
126 DEVMETHOD(device_probe, llan_probe),
127 DEVMETHOD(device_attach, llan_attach),
131 static driver_t llan_driver = {
134 sizeof(struct llan_softc)
136 DRIVER_MODULE(llan, vdevice, llan_driver, llan_devclass, 0, 0);
139 llan_probe(device_t dev)
141 if (!ofw_bus_is_compatible(dev,"IBM,l-lan"))
144 device_set_desc(dev, "POWER Hypervisor Virtual Ethernet");
149 llan_attach(device_t dev)
151 struct llan_softc *sc;
155 sc = device_get_softc(dev);
158 /* Get firmware properties */
159 node = ofw_bus_get_node(dev);
160 OF_getprop(node, "local-mac-address", sc->mac_address,
161 sizeof(sc->mac_address));
162 OF_getprop(node, "reg", &sc->unit, sizeof(sc->unit));
164 mtx_init(&sc->io_lock, "llan", NULL, MTX_DEF);
166 /* Setup interrupt */
168 sc->irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &sc->irqid,
172 device_printf(dev, "Could not allocate IRQ\n");
173 mtx_destroy(&sc->io_lock);
177 bus_setup_intr(dev, sc->irq, INTR_TYPE_MISC | INTR_MPSAFE |
178 INTR_ENTROPY, NULL, llan_intr, sc, &sc->irq_cookie);
181 error = bus_dma_tag_create(bus_get_dma_tag(dev), 16, 0,
182 BUS_SPACE_MAXADDR, BUS_SPACE_MAXADDR, NULL, NULL,
183 LLAN_RX_BUF_LEN, 1, BUS_SPACE_MAXSIZE_32BIT,
184 0, NULL, NULL, &sc->rx_dma_tag);
185 error = bus_dma_tag_create(bus_get_dma_tag(dev), 4, 0,
186 BUS_SPACE_MAXADDR, BUS_SPACE_MAXADDR, NULL, NULL,
187 BUS_SPACE_MAXSIZE, 1, BUS_SPACE_MAXSIZE_32BIT,
188 0, NULL, NULL, &sc->rxbuf_dma_tag);
189 error = bus_dma_tag_create(bus_get_dma_tag(dev), 1, 0,
190 BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, NULL, NULL,
191 BUS_SPACE_MAXSIZE, 6, BUS_SPACE_MAXSIZE_32BIT, 0,
192 busdma_lock_mutex, &sc->io_lock, &sc->tx_dma_tag);
194 error = bus_dmamem_alloc(sc->rx_dma_tag, (void **)&sc->rx_buf,
195 BUS_DMA_WAITOK | BUS_DMA_ZERO, &sc->rx_buf_map);
196 error = bus_dmamap_load(sc->rx_dma_tag, sc->rx_buf_map, sc->rx_buf,
197 LLAN_RX_BUF_LEN, llan_rx_load_cb, sc, 0);
200 bus_dmamap_create(sc->tx_dma_tag, 0, &sc->tx_dma_map);
203 for (i = 0; i < LLAN_MAX_RX_PACKETS; i++) {
204 error = bus_dmamap_create(sc->rxbuf_dma_tag, 0,
205 &sc->rx_xfer[i].rx_dmamap);
206 sc->rx_xfer[i].rx_mbuf = NULL;
209 /* Attach to network stack */
210 sc->ifp = if_alloc(IFT_ETHER);
211 sc->ifp->if_softc = sc;
213 if_initname(sc->ifp, device_get_name(dev), device_get_unit(dev));
214 sc->ifp->if_mtu = ETHERMTU; /* XXX max-frame-size from OF? */
215 sc->ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
216 sc->ifp->if_hwassist = 0; /* XXX: ibm,illan-options */
217 sc->ifp->if_capabilities = 0;
218 sc->ifp->if_capenable = 0;
219 sc->ifp->if_start = llan_start;
220 sc->ifp->if_ioctl = llan_ioctl;
221 sc->ifp->if_init = llan_init;
223 IFQ_SET_MAXLEN(&sc->ifp->if_snd, LLAN_MAX_TX_PACKETS);
224 sc->ifp->if_snd.ifq_drv_maxlen = LLAN_MAX_TX_PACKETS;
225 IFQ_SET_READY(&sc->ifp->if_snd);
227 ether_ifattach(sc->ifp, &sc->mac_address[2]);
233 llan_rx_load_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int err)
235 struct llan_softc *sc = xsc;
237 sc->rx_buf_phys = segs[0].ds_addr;
238 sc->rx_buf_len = segs[0].ds_len - 2*PAGE_SIZE;
239 sc->input_buf_phys = segs[0].ds_addr + segs[0].ds_len - PAGE_SIZE;
240 sc->filter_buf_phys = segs[0].ds_addr + segs[0].ds_len - 2*PAGE_SIZE;
246 struct llan_softc *sc = xsc;
247 uint64_t rx_buf_desc;
251 mtx_lock(&sc->io_lock);
253 phyp_hcall(H_FREE_LOGICAL_LAN, sc->unit);
255 /* Create buffers (page 539) */
257 sc->rx_valid_val = 1;
259 rx_buf_desc = LLAN_BUFDESC_VALID;
260 rx_buf_desc |= (sc->rx_buf_len << 32);
261 rx_buf_desc |= sc->rx_buf_phys;
262 memcpy(&macaddr, sc->mac_address, 8);
263 err = phyp_hcall(H_REGISTER_LOGICAL_LAN, sc->unit, sc->input_buf_phys,
264 rx_buf_desc, sc->filter_buf_phys, macaddr);
266 for (i = 0; i < LLAN_MAX_RX_PACKETS; i++)
267 llan_add_rxbuf(sc, &sc->rx_xfer[i]);
269 phyp_hcall(H_VIO_SIGNAL, sc->unit, 1); /* Enable interrupts */
271 /* Tell stack we're up */
272 sc->ifp->if_drv_flags |= IFF_DRV_RUNNING;
273 sc->ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
275 mtx_unlock(&sc->io_lock);
279 llan_add_rxbuf(struct llan_softc *sc, struct llan_xfer *rx)
282 bus_dma_segment_t segs[1];
285 mtx_assert(&sc->io_lock, MA_OWNED);
287 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
291 m->m_len = m->m_pkthdr.len = m->m_ext.ext_size;
292 if (rx->rx_mbuf != NULL) {
293 bus_dmamap_sync(sc->rxbuf_dma_tag, rx->rx_dmamap,
294 BUS_DMASYNC_POSTREAD);
295 bus_dmamap_unload(sc->rxbuf_dma_tag, rx->rx_dmamap);
298 /* Save pointer to buffer structure */
299 m_copyback(m, 0, 8, (void *)&rx);
301 error = bus_dmamap_load_mbuf_sg(sc->rxbuf_dma_tag, rx->rx_dmamap, m,
302 segs, &nsegs, BUS_DMA_NOWAIT);
304 device_printf(sc->dev,
305 "cannot load RX DMA map %p, error = %d\n", rx, error);
310 /* If nsegs is wrong then the stack is corrupt. */
312 ("%s: too many DMA segments (%d)", __func__, nsegs));
315 bus_dmamap_sync(sc->rxbuf_dma_tag, rx->rx_dmamap, BUS_DMASYNC_PREREAD);
317 rx->rx_bufdesc = LLAN_BUFDESC_VALID;
318 rx->rx_bufdesc |= (((uint64_t)segs[0].ds_len) << 32);
319 rx->rx_bufdesc |= segs[0].ds_addr;
320 error = phyp_hcall(H_ADD_LOGICAL_LAN_BUFFER, sc->unit, rx->rx_bufdesc);
333 struct llan_softc *sc = xsc;
334 struct llan_xfer *rx;
337 mtx_lock(&sc->io_lock);
338 phyp_hcall(H_VIO_SIGNAL, sc->unit, 0);
340 while ((sc->rx_buf[sc->rx_dma_slot].control >> 7) == sc->rx_valid_val) {
341 rx = (struct llan_xfer *)sc->rx_buf[sc->rx_dma_slot].handle;
343 m_adj(m, sc->rx_buf[sc->rx_dma_slot].offset - 8);
344 m->m_len = sc->rx_buf[sc->rx_dma_slot].length;
346 /* llan_add_rxbuf does DMA sync and unload as well as requeue */
347 if (llan_add_rxbuf(sc, rx) != 0) {
348 if_inc_counter(sc->ifp, IFCOUNTER_IERRORS, 1);
349 phyp_hcall(H_ADD_LOGICAL_LAN_BUFFER, sc->unit,
354 if_inc_counter(sc->ifp, IFCOUNTER_IPACKETS, 1);
355 m_adj(m, sc->rx_buf[sc->rx_dma_slot].offset);
356 m->m_len = sc->rx_buf[sc->rx_dma_slot].length;
357 m->m_pkthdr.rcvif = sc->ifp;
358 m->m_pkthdr.len = m->m_len;
361 if (sc->rx_dma_slot >= sc->rx_buf_len/sizeof(sc->rx_buf[0])) {
363 sc->rx_valid_val = !sc->rx_valid_val;
366 mtx_unlock(&sc->io_lock);
367 (*sc->ifp->if_input)(sc->ifp, m);
368 mtx_lock(&sc->io_lock);
371 phyp_hcall(H_VIO_SIGNAL, sc->unit, 1);
372 mtx_unlock(&sc->io_lock);
376 llan_send_packet(void *xsc, bus_dma_segment_t *segs, int nsegs,
377 bus_size_t mapsize, int error)
379 struct llan_softc *sc = xsc;
380 uint64_t bufdescs[6];
383 bzero(bufdescs, sizeof(bufdescs));
385 for (i = 0; i < nsegs; i++) {
386 bufdescs[i] = LLAN_BUFDESC_VALID;
387 bufdescs[i] |= (((uint64_t)segs[i].ds_len) << 32);
388 bufdescs[i] |= segs[i].ds_addr;
391 phyp_hcall(H_SEND_LOGICAL_LAN, sc->unit, bufdescs[0],
392 bufdescs[1], bufdescs[2], bufdescs[3], bufdescs[4], bufdescs[5], 0);
394 * The hypercall returning implies completion -- or that the call will
395 * not complete. In principle, we should try a few times if we get back
396 * H_BUSY based on the continuation token in R4. For now, just drop
397 * the packet in such cases.
402 llan_start_locked(struct ifnet *ifp)
404 struct llan_softc *sc = ifp->if_softc;
407 struct mbuf *mb_head, *m;
409 mtx_assert(&sc->io_lock, MA_OWNED);
412 if ((ifp->if_drv_flags & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) !=
416 while (!IFQ_DRV_IS_EMPTY(&ifp->if_snd)) {
417 IFQ_DRV_DEQUEUE(&ifp->if_snd, mb_head);
422 BPF_MTAP(ifp, mb_head);
424 for (m = mb_head, nsegs = 0; m != NULL; m = m->m_next)
427 m = m_collapse(mb_head, M_NOWAIT, 6);
434 bus_dmamap_load_mbuf(sc->tx_dma_tag, sc->tx_dma_map,
435 mb_head, llan_send_packet, sc, 0);
436 bus_dmamap_unload(sc->tx_dma_tag, sc->tx_dma_map);
442 llan_start(struct ifnet *ifp)
444 struct llan_softc *sc = ifp->if_softc;
446 mtx_lock(&sc->io_lock);
447 llan_start_locked(ifp);
448 mtx_unlock(&sc->io_lock);
452 llan_set_multicast(struct llan_softc *sc)
454 struct ifnet *ifp = sc->ifp;
455 struct ifmultiaddr *inm;
458 mtx_assert(&sc->io_lock, MA_OWNED);
460 phyp_hcall(H_MULTICAST_CTRL, sc->unit, LLAN_CLEAR_MULTICAST, 0);
463 TAILQ_FOREACH(inm, &ifp->if_multiaddrs, ifma_link) {
464 if (inm->ifma_addr->sa_family != AF_LINK)
467 memcpy((uint8_t *)&macaddr + 2,
468 LLADDR((struct sockaddr_dl *)inm->ifma_addr), 6);
469 phyp_hcall(H_MULTICAST_CTRL, sc->unit, LLAN_ADD_MULTICAST,
472 if_maddr_runlock(ifp);
478 llan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
481 struct llan_softc *sc = ifp->if_softc;
486 mtx_lock(&sc->io_lock);
487 if ((sc->ifp->if_drv_flags & IFF_DRV_RUNNING) != 0)
488 llan_set_multicast(sc);
489 mtx_unlock(&sc->io_lock);
493 err = ether_ioctl(ifp, cmd, data);