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>
35 #include <sys/module.h>
36 #include <sys/malloc.h>
37 #include <sys/kernel.h>
38 #include <sys/socket.h>
42 #include <net/if_arp.h>
43 #include <net/ethernet.h>
44 #include <net/if_dl.h>
45 #include <net/if_media.h>
46 #include <net/if_types.h>
47 #include <net/if_vlan_var.h>
49 #include <dev/ofw/openfirm.h>
50 #include <dev/ofw/ofw_bus.h>
51 #include <dev/ofw/ofw_bus_subr.h>
52 #include <machine/bus.h>
53 #include <machine/resource.h>
57 #include <powerpc/pseries/phyp-hvcall.h>
59 #define LLAN_MAX_RX_PACKETS 100
60 #define LLAN_MAX_TX_PACKETS 100
61 #define LLAN_RX_BUF_LEN 8*PAGE_SIZE
63 #define LLAN_BUFDESC_VALID (1ULL << 63)
64 #define LLAN_ADD_MULTICAST 0x1
65 #define LLAN_DEL_MULTICAST 0x2
66 #define LLAN_CLEAR_MULTICAST 0x3
70 bus_dmamap_t rx_dmamap;
74 struct llan_receive_queue_entry { /* PAPR page 539 */
87 uint8_t mac_address[8];
93 bus_dma_tag_t rx_dma_tag;
94 bus_dma_tag_t rxbuf_dma_tag;
95 bus_dma_tag_t tx_dma_tag;
97 bus_dmamap_t tx_dma_map;
99 struct llan_receive_queue_entry *rx_buf;
102 bus_dmamap_t rx_buf_map;
103 bus_addr_t rx_buf_phys;
104 bus_size_t rx_buf_len;
105 bus_addr_t input_buf_phys;
106 bus_addr_t filter_buf_phys;
107 struct llan_xfer rx_xfer[LLAN_MAX_RX_PACKETS];
112 static int llan_probe(device_t);
113 static int llan_attach(device_t);
114 static void llan_intr(void *xsc);
115 static void llan_init(void *xsc);
116 static void llan_start(struct ifnet *ifp);
117 static int llan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
118 static void llan_rx_load_cb(void *xsc, bus_dma_segment_t *segs, int nsegs,
120 static int llan_add_rxbuf(struct llan_softc *sc, struct llan_xfer *rx);
121 static int llan_set_multicast(struct llan_softc *sc);
123 static devclass_t llan_devclass;
124 static device_method_t llan_methods[] = {
125 DEVMETHOD(device_probe, llan_probe),
126 DEVMETHOD(device_attach, llan_attach),
130 static driver_t llan_driver = {
133 sizeof(struct llan_softc)
135 DRIVER_MODULE(llan, vdevice, llan_driver, llan_devclass, 0, 0);
138 llan_probe(device_t dev)
140 if (!ofw_bus_is_compatible(dev,"IBM,l-lan"))
143 device_set_desc(dev, "POWER Hypervisor Virtual Ethernet");
148 llan_attach(device_t dev)
150 struct llan_softc *sc;
154 sc = device_get_softc(dev);
157 /* Get firmware properties */
158 node = ofw_bus_get_node(dev);
159 OF_getprop(node, "local-mac-address", sc->mac_address,
160 sizeof(sc->mac_address));
161 OF_getprop(node, "reg", &sc->unit, sizeof(sc->unit));
163 mtx_init(&sc->io_lock, "llan", NULL, MTX_DEF);
165 /* Setup interrupt */
167 sc->irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &sc->irqid,
171 device_printf(dev, "Could not allocate IRQ\n");
172 mtx_destroy(&sc->io_lock);
176 bus_setup_intr(dev, sc->irq, INTR_TYPE_MISC | INTR_MPSAFE |
177 INTR_ENTROPY, NULL, llan_intr, sc, &sc->irq_cookie);
180 error = bus_dma_tag_create(bus_get_dma_tag(dev), 16, 0,
181 BUS_SPACE_MAXADDR, BUS_SPACE_MAXADDR, NULL, NULL,
182 LLAN_RX_BUF_LEN, 1, BUS_SPACE_MAXSIZE_32BIT,
183 0, NULL, NULL, &sc->rx_dma_tag);
184 error = bus_dma_tag_create(bus_get_dma_tag(dev), 4, 0,
185 BUS_SPACE_MAXADDR, BUS_SPACE_MAXADDR, NULL, NULL,
186 BUS_SPACE_MAXSIZE, 1, BUS_SPACE_MAXSIZE_32BIT,
187 0, NULL, NULL, &sc->rxbuf_dma_tag);
188 error = bus_dma_tag_create(bus_get_dma_tag(dev), 1, 0,
189 BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, NULL, NULL,
190 BUS_SPACE_MAXSIZE, 6, BUS_SPACE_MAXSIZE_32BIT, 0,
191 busdma_lock_mutex, &sc->io_lock, &sc->tx_dma_tag);
193 error = bus_dmamem_alloc(sc->rx_dma_tag, (void **)&sc->rx_buf,
194 BUS_DMA_WAITOK | BUS_DMA_ZERO, &sc->rx_buf_map);
195 error = bus_dmamap_load(sc->rx_dma_tag, sc->rx_buf_map, sc->rx_buf,
196 LLAN_RX_BUF_LEN, llan_rx_load_cb, sc, 0);
199 bus_dmamap_create(sc->tx_dma_tag, 0, &sc->tx_dma_map);
202 for (i = 0; i < LLAN_MAX_RX_PACKETS; i++) {
203 error = bus_dmamap_create(sc->rxbuf_dma_tag, 0,
204 &sc->rx_xfer[i].rx_dmamap);
205 sc->rx_xfer[i].rx_mbuf = NULL;
208 /* Attach to network stack */
209 sc->ifp = if_alloc(IFT_ETHER);
210 sc->ifp->if_softc = sc;
212 if_initname(sc->ifp, device_get_name(dev), device_get_unit(dev));
213 sc->ifp->if_mtu = ETHERMTU; /* XXX max-frame-size from OF? */
214 sc->ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
215 sc->ifp->if_hwassist = 0; /* XXX: ibm,illan-options */
216 sc->ifp->if_capabilities = 0;
217 sc->ifp->if_capenable = 0;
218 sc->ifp->if_start = llan_start;
219 sc->ifp->if_ioctl = llan_ioctl;
220 sc->ifp->if_init = llan_init;
222 IFQ_SET_MAXLEN(&sc->ifp->if_snd, LLAN_MAX_TX_PACKETS);
223 sc->ifp->if_snd.ifq_drv_maxlen = LLAN_MAX_TX_PACKETS;
224 IFQ_SET_READY(&sc->ifp->if_snd);
226 ether_ifattach(sc->ifp, &sc->mac_address[2]);
232 llan_rx_load_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int err)
234 struct llan_softc *sc = xsc;
236 sc->rx_buf_phys = segs[0].ds_addr;
237 sc->rx_buf_len = segs[0].ds_len - 2*PAGE_SIZE;
238 sc->input_buf_phys = segs[0].ds_addr + segs[0].ds_len - PAGE_SIZE;
239 sc->filter_buf_phys = segs[0].ds_addr + segs[0].ds_len - 2*PAGE_SIZE;
245 struct llan_softc *sc = xsc;
246 uint64_t rx_buf_desc;
250 mtx_lock(&sc->io_lock);
252 phyp_hcall(H_FREE_LOGICAL_LAN, sc->unit);
254 /* Create buffers (page 539) */
256 sc->rx_valid_val = 1;
258 rx_buf_desc = LLAN_BUFDESC_VALID;
259 rx_buf_desc |= (sc->rx_buf_len << 32);
260 rx_buf_desc |= sc->rx_buf_phys;
261 memcpy(&macaddr, sc->mac_address, 8);
262 err = phyp_hcall(H_REGISTER_LOGICAL_LAN, sc->unit, sc->input_buf_phys,
263 rx_buf_desc, sc->filter_buf_phys, macaddr);
265 for (i = 0; i < LLAN_MAX_RX_PACKETS; i++)
266 llan_add_rxbuf(sc, &sc->rx_xfer[i]);
268 phyp_hcall(H_VIO_SIGNAL, sc->unit, 1); /* Enable interrupts */
270 /* Tell stack we're up */
271 sc->ifp->if_drv_flags |= IFF_DRV_RUNNING;
272 sc->ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
274 mtx_unlock(&sc->io_lock);
278 llan_add_rxbuf(struct llan_softc *sc, struct llan_xfer *rx)
281 bus_dma_segment_t segs[1];
284 mtx_assert(&sc->io_lock, MA_OWNED);
286 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
290 m->m_len = m->m_pkthdr.len = m->m_ext.ext_size;
291 if (rx->rx_mbuf != NULL) {
292 bus_dmamap_sync(sc->rxbuf_dma_tag, rx->rx_dmamap,
293 BUS_DMASYNC_POSTREAD);
294 bus_dmamap_unload(sc->rxbuf_dma_tag, rx->rx_dmamap);
297 /* Save pointer to buffer structure */
298 m_copyback(m, 0, 8, (void *)&rx);
300 error = bus_dmamap_load_mbuf_sg(sc->rxbuf_dma_tag, rx->rx_dmamap, m,
301 segs, &nsegs, BUS_DMA_NOWAIT);
303 device_printf(sc->dev,
304 "cannot load RX DMA map %p, error = %d\n", rx, error);
309 /* If nsegs is wrong then the stack is corrupt. */
311 ("%s: too many DMA segments (%d)", __func__, nsegs));
314 bus_dmamap_sync(sc->rxbuf_dma_tag, rx->rx_dmamap, BUS_DMASYNC_PREREAD);
316 rx->rx_bufdesc = LLAN_BUFDESC_VALID;
317 rx->rx_bufdesc |= (((uint64_t)segs[0].ds_len) << 32);
318 rx->rx_bufdesc |= segs[0].ds_addr;
319 error = phyp_hcall(H_ADD_LOGICAL_LAN_BUFFER, sc->unit, rx->rx_bufdesc);
332 struct llan_softc *sc = xsc;
333 struct llan_xfer *rx;
336 mtx_lock(&sc->io_lock);
337 phyp_hcall(H_VIO_SIGNAL, sc->unit, 0);
339 while ((sc->rx_buf[sc->rx_dma_slot].control >> 7) == sc->rx_valid_val) {
340 rx = (struct llan_xfer *)sc->rx_buf[sc->rx_dma_slot].handle;
342 m_adj(m, sc->rx_buf[sc->rx_dma_slot].offset - 8);
343 m->m_len = sc->rx_buf[sc->rx_dma_slot].length;
345 /* llan_add_rxbuf does DMA sync and unload as well as requeue */
346 if (llan_add_rxbuf(sc, rx) != 0) {
347 sc->ifp->if_ierrors++;
348 phyp_hcall(H_ADD_LOGICAL_LAN_BUFFER, sc->unit,
353 sc->ifp->if_ipackets++;
354 m_adj(m, sc->rx_buf[sc->rx_dma_slot].offset);
355 m->m_len = sc->rx_buf[sc->rx_dma_slot].length;
356 m->m_pkthdr.rcvif = sc->ifp;
357 m->m_pkthdr.len = m->m_len;
360 if (sc->rx_dma_slot >= sc->rx_buf_len/sizeof(sc->rx_buf[0])) {
362 sc->rx_valid_val = !sc->rx_valid_val;
365 mtx_unlock(&sc->io_lock);
366 (*sc->ifp->if_input)(sc->ifp, m);
367 mtx_lock(&sc->io_lock);
370 phyp_hcall(H_VIO_SIGNAL, sc->unit, 1);
371 mtx_unlock(&sc->io_lock);
375 llan_send_packet(void *xsc, bus_dma_segment_t *segs, int nsegs,
376 bus_size_t mapsize, int error)
378 struct llan_softc *sc = xsc;
379 uint64_t bufdescs[6];
382 bzero(bufdescs, sizeof(bufdescs));
384 for (i = 0; i < nsegs; i++) {
385 bufdescs[i] = LLAN_BUFDESC_VALID;
386 bufdescs[i] |= (((uint64_t)segs[i].ds_len) << 32);
387 bufdescs[i] |= segs[i].ds_addr;
390 phyp_hcall(H_SEND_LOGICAL_LAN, sc->unit, bufdescs[0],
391 bufdescs[1], bufdescs[2], bufdescs[3], bufdescs[4], bufdescs[5], 0);
393 * The hypercall returning implies completion -- or that the call will
394 * not complete. In principle, we should try a few times if we get back
395 * H_BUSY based on the continuation token in R4. For now, just drop
396 * the packet in such cases.
401 llan_start_locked(struct ifnet *ifp)
403 struct llan_softc *sc = ifp->if_softc;
406 struct mbuf *mb_head, *m;
408 mtx_assert(&sc->io_lock, MA_OWNED);
411 if ((ifp->if_drv_flags & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) !=
415 while (!IFQ_DRV_IS_EMPTY(&ifp->if_snd)) {
416 IFQ_DRV_DEQUEUE(&ifp->if_snd, mb_head);
421 BPF_MTAP(ifp, mb_head);
423 for (m = mb_head, nsegs = 0; m != NULL; m = m->m_next)
426 m = m_collapse(mb_head, M_NOWAIT, 6);
433 bus_dmamap_load_mbuf(sc->tx_dma_tag, sc->tx_dma_map,
434 mb_head, llan_send_packet, sc, 0);
435 bus_dmamap_unload(sc->tx_dma_tag, sc->tx_dma_map);
441 llan_start(struct ifnet *ifp)
443 struct llan_softc *sc = ifp->if_softc;
445 mtx_lock(&sc->io_lock);
446 llan_start_locked(ifp);
447 mtx_unlock(&sc->io_lock);
451 llan_set_multicast(struct llan_softc *sc)
453 struct ifnet *ifp = sc->ifp;
454 struct ifmultiaddr *inm;
457 mtx_assert(&sc->io_lock, MA_OWNED);
459 phyp_hcall(H_MULTICAST_CTRL, sc->unit, LLAN_CLEAR_MULTICAST, 0);
462 TAILQ_FOREACH(inm, &ifp->if_multiaddrs, ifma_link) {
463 if (inm->ifma_addr->sa_family != AF_LINK)
466 memcpy((uint8_t *)&macaddr + 2,
467 LLADDR((struct sockaddr_dl *)inm->ifma_addr), 6);
468 phyp_hcall(H_MULTICAST_CTRL, sc->unit, LLAN_ADD_MULTICAST,
471 if_maddr_runlock(ifp);
477 llan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
480 struct llan_softc *sc = ifp->if_softc;
485 mtx_lock(&sc->io_lock);
486 if ((sc->ifp->if_drv_flags & IFF_DRV_RUNNING) != 0)
487 llan_set_multicast(sc);
488 mtx_unlock(&sc->io_lock);
492 err = ether_ioctl(ifp, cmd, data);