1 files changed, 556 insertions, 0 deletions

diff --git a/sys/powerpc/pseries/phyp_llan.c b/sys/powerpc/pseries/phyp_llan.c
new file mode 100644
index 000000000000..4ba4549a9cf5
--- /dev/null
+++ b/sys/powerpc/pseries/phyp_llan.c
@@ -0,0 +1,556 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright 2013 Nathan Whitehorn
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/sockio.h>
+#include <sys/endian.h>
+#include <sys/lock.h>
+#include <sys/mbuf.h>
+#include <sys/module.h>
+#include <sys/malloc.h>
+#include <sys/mutex.h>
+#include <sys/kernel.h>
+#include <sys/socket.h>
+
+#include <net/bpf.h>
+#include <net/if.h>
+#include <net/if_var.h>
+#include <net/ethernet.h>
+#include <net/if_dl.h>
+#include <net/if_media.h>
+#include <net/if_types.h>
+
+#include <dev/ofw/openfirm.h>
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+#include <machine/bus.h>
+#include <machine/resource.h>
+#include <sys/bus.h>
+#include <sys/rman.h>
+
+#include <powerpc/pseries/phyp-hvcall.h>
+
+#define LLAN_MAX_RX_PACKETS	100
+#define LLAN_MAX_TX_PACKETS	100
+#define LLAN_RX_BUF_LEN		8*PAGE_SIZE
+
+#define LLAN_BUFDESC_VALID	(1ULL << 63)
+#define LLAN_ADD_MULTICAST	0x1
+#define LLAN_DEL_MULTICAST	0x2
+#define LLAN_CLEAR_MULTICAST	0x3
+
+struct llan_xfer {
+	struct mbuf *rx_mbuf;
+	bus_dmamap_t rx_dmamap;
+	uint64_t rx_bufdesc;
+};
+
+struct llan_receive_queue_entry { /* PAPR page 539 */
+	uint8_t control;
+	uint8_t reserved;
+	uint16_t offset;
+	uint32_t length;
+	uint64_t handle;
+} __packed;
+
+struct llan_softc {
+	device_t	dev;
+	struct mtx	io_lock;
+
+	cell_t		unit;
+	uint8_t		mac_address[8];
+
+	struct ifmedia	media;
+
+	int		irqid;
+	struct resource	*irq;
+	void		*irq_cookie;
+
+	bus_dma_tag_t	rx_dma_tag;
+	bus_dma_tag_t	rxbuf_dma_tag;
+	bus_dma_tag_t	tx_dma_tag;
+
+	bus_dmamap_t	tx_dma_map;
+
+	struct llan_receive_queue_entry *rx_buf;
+	int		rx_dma_slot;
+	int		rx_valid_val;
+	bus_dmamap_t	rx_buf_map;
+	bus_addr_t	rx_buf_phys;
+	bus_size_t	rx_buf_len;
+	bus_addr_t	input_buf_phys;
+	bus_addr_t	filter_buf_phys;
+	struct llan_xfer rx_xfer[LLAN_MAX_RX_PACKETS];
+
+	struct ifnet	*ifp;
+};
+
+static int	llan_probe(device_t);
+static int	llan_attach(device_t);
+static void	llan_intr(void *xsc);
+static void	llan_init(void *xsc);
+static void	llan_start(struct ifnet *ifp);
+static int	llan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
+static void	llan_media_status(struct ifnet *ifp, struct ifmediareq *ifmr);
+static int	llan_media_change(struct ifnet *ifp);
+static void	llan_rx_load_cb(void *xsc, bus_dma_segment_t *segs, int nsegs,
+		    int err);
+static int	llan_add_rxbuf(struct llan_softc *sc, struct llan_xfer *rx);
+static int	llan_set_multicast(struct llan_softc *sc);
+
+static device_method_t  llan_methods[] = {
+        DEVMETHOD(device_probe,         llan_probe),
+        DEVMETHOD(device_attach,        llan_attach),
+        
+        DEVMETHOD_END
+};
+
+static driver_t llan_driver = {
+        "llan",
+        llan_methods,
+        sizeof(struct llan_softc)
+};
+
+DRIVER_MODULE(llan, vdevice, llan_driver, 0, 0);
+
+static int
+llan_probe(device_t dev)
+{
+	if (!ofw_bus_is_compatible(dev,"IBM,l-lan"))
+		return (ENXIO);
+
+	device_set_desc(dev, "POWER Hypervisor Virtual Ethernet");
+	return (0);
+}
+
+static int
+llan_attach(device_t dev)
+{
+	struct llan_softc *sc;
+	phandle_t node;
+	int i;
+	ssize_t len;
+
+	sc = device_get_softc(dev);
+	sc->dev = dev;
+
+	/* Get firmware properties */
+	node = ofw_bus_get_node(dev);
+	len = OF_getprop(node, "local-mac-address", sc->mac_address,
+	    sizeof(sc->mac_address));
+	/* If local-mac-address property has only 6 bytes (ETHER_ADDR_LEN)
+	 * instead of 8 (sizeof(sc->mac_address)), then its value must be
+	 * shifted 2 bytes to the right. */
+	if (len == ETHER_ADDR_LEN) {
+		bcopy(sc->mac_address, &sc->mac_address[2], len);
+		/* Zero out the first 2 bytes. */
+		bzero(sc->mac_address, 2);
+	}
+	OF_getencprop(node, "reg", &sc->unit, sizeof(sc->unit));
+
+	mtx_init(&sc->io_lock, "llan", NULL, MTX_DEF);
+
+        /* Setup interrupt */
+	sc->irqid = 0;
+	sc->irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &sc->irqid,
+	    RF_ACTIVE);
+
+	if (!sc->irq) {
+		device_printf(dev, "Could not allocate IRQ\n");
+		mtx_destroy(&sc->io_lock);
+		return (ENXIO);
+	}
+
+	bus_setup_intr(dev, sc->irq, INTR_TYPE_NET | INTR_MPSAFE |
+	    INTR_ENTROPY, NULL, llan_intr, sc, &sc->irq_cookie);
+
+	/* Setup DMA */
+	bus_dma_tag_create(bus_get_dma_tag(dev), 16, 0,
+            BUS_SPACE_MAXADDR, BUS_SPACE_MAXADDR, NULL, NULL,
+	    LLAN_RX_BUF_LEN, 1, BUS_SPACE_MAXSIZE_32BIT,
+	    0, NULL, NULL, &sc->rx_dma_tag);
+	bus_dma_tag_create(bus_get_dma_tag(dev), 4, 0,
+            BUS_SPACE_MAXADDR, BUS_SPACE_MAXADDR, NULL, NULL,
+	    BUS_SPACE_MAXSIZE, 1, BUS_SPACE_MAXSIZE_32BIT,
+	    0, NULL, NULL, &sc->rxbuf_dma_tag);
+	bus_dma_tag_create(bus_get_dma_tag(dev), 1, 0,
+            BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, NULL, NULL,
+	    BUS_SPACE_MAXSIZE, 6, BUS_SPACE_MAXSIZE_32BIT, 0,
+	    busdma_lock_mutex, &sc->io_lock, &sc->tx_dma_tag);
+
+	bus_dmamem_alloc(sc->rx_dma_tag, (void **)&sc->rx_buf,
+	    BUS_DMA_WAITOK | BUS_DMA_ZERO, &sc->rx_buf_map);
+	bus_dmamap_load(sc->rx_dma_tag, sc->rx_buf_map, sc->rx_buf,
+	    LLAN_RX_BUF_LEN, llan_rx_load_cb, sc, 0);
+
+	/* TX DMA maps */
+	bus_dmamap_create(sc->tx_dma_tag, 0, &sc->tx_dma_map);
+
+	/* RX DMA */
+	for (i = 0; i < LLAN_MAX_RX_PACKETS; i++) {
+		bus_dmamap_create(sc->rxbuf_dma_tag, 0,
+		    &sc->rx_xfer[i].rx_dmamap);
+		sc->rx_xfer[i].rx_mbuf = NULL;
+	}
+
+	/* Attach to network stack */
+	sc->ifp = if_alloc(IFT_ETHER);
+	if_setsoftc(sc->ifp, sc);
+
+	if_initname(sc->ifp, device_get_name(dev), device_get_unit(dev));
+	if_setmtu(sc->ifp, ETHERMTU); /* XXX max-frame-size from OF? */
+	if_setflags(sc->ifp, IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST);
+	if_sethwassist(sc->ifp, 0); /* XXX: ibm,illan-options */
+	if_setcapabilities(sc->ifp, 0);
+	if_setcapenable(sc->ifp, 0);
+	if_setstartfn(sc->ifp, llan_start);
+	if_setioctlfn(sc->ifp, llan_ioctl);
+	if_setinitfn(sc->ifp, llan_init);
+
+	ifmedia_init(&sc->media, IFM_IMASK, llan_media_change,
+	    llan_media_status);
+	ifmedia_add(&sc->media, IFM_ETHER | IFM_AUTO, 0, NULL);
+	ifmedia_set(&sc->media, IFM_ETHER | IFM_AUTO);
+
+	if_setsendqlen(sc->ifp, LLAN_MAX_RX_PACKETS);
+	if_setsendqready(sc->ifp);
+
+	ether_ifattach(sc->ifp, &sc->mac_address[2]);
+
+	/* We don't have link state reporting, so make it always up */
+	if_link_state_change(sc->ifp, LINK_STATE_UP);
+
+	return (0);
+}
+
+static int
+llan_media_change(struct ifnet *ifp)
+{
+	struct llan_softc *sc = if_getsoftc(ifp);
+
+	if (IFM_TYPE(sc->media.ifm_media) != IFM_ETHER)
+		return (EINVAL);
+
+	if (IFM_SUBTYPE(sc->media.ifm_media) != IFM_AUTO)
+		return (EINVAL);
+
+	return (0);
+}
+
+static void
+llan_media_status(struct ifnet *ifp, struct ifmediareq *ifmr)
+{
+
+	ifmr->ifm_status = IFM_AVALID | IFM_ACTIVE | IFM_UNKNOWN | IFM_FDX;
+	ifmr->ifm_active = IFM_ETHER;
+}
+
+static void
+llan_rx_load_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int err)
+{
+	struct llan_softc *sc = xsc;
+
+	sc->rx_buf_phys = segs[0].ds_addr;
+	sc->rx_buf_len = segs[0].ds_len - 2*PAGE_SIZE;
+	sc->input_buf_phys = segs[0].ds_addr + segs[0].ds_len - PAGE_SIZE;
+	sc->filter_buf_phys = segs[0].ds_addr + segs[0].ds_len - 2*PAGE_SIZE;
+}
+
+static void
+llan_init(void *xsc)
+{
+	struct llan_softc *sc = xsc;
+	uint64_t rx_buf_desc;
+	uint64_t macaddr;
+	int i;
+
+	mtx_lock(&sc->io_lock);
+
+	phyp_hcall(H_FREE_LOGICAL_LAN, sc->unit);
+
+	/* Create buffers (page 539) */
+	sc->rx_dma_slot = 0;
+	sc->rx_valid_val = 1;
+
+	rx_buf_desc = LLAN_BUFDESC_VALID;
+	rx_buf_desc |= (sc->rx_buf_len << 32);
+	rx_buf_desc |= sc->rx_buf_phys;
+	memcpy(&macaddr, sc->mac_address, 8);
+	phyp_hcall(H_REGISTER_LOGICAL_LAN, sc->unit, sc->input_buf_phys,
+	    rx_buf_desc, sc->filter_buf_phys, macaddr);
+
+	for (i = 0; i < LLAN_MAX_RX_PACKETS; i++)
+		llan_add_rxbuf(sc, &sc->rx_xfer[i]);
+
+	phyp_hcall(H_VIO_SIGNAL, sc->unit, 1); /* Enable interrupts */
+
+	/* Tell stack we're up */
+	if_setdrvflagbits(sc->ifp, IFF_DRV_RUNNING, IFF_DRV_OACTIVE);
+
+	mtx_unlock(&sc->io_lock);
+
+	/* Check for pending receives scheduled before interrupt enable */
+	llan_intr(sc);
+}
+
+static int
+llan_add_rxbuf(struct llan_softc *sc, struct llan_xfer *rx)
+{
+	struct mbuf *m;
+	bus_dma_segment_t segs[1];
+	int error, nsegs;
+
+	mtx_assert(&sc->io_lock, MA_OWNED);
+
+	m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
+	if (m == NULL)
+		return (ENOBUFS);
+
+	m->m_len = m->m_pkthdr.len = m->m_ext.ext_size;
+	if (rx->rx_mbuf != NULL) {
+		bus_dmamap_sync(sc->rxbuf_dma_tag, rx->rx_dmamap,
+		    BUS_DMASYNC_POSTREAD);
+		bus_dmamap_unload(sc->rxbuf_dma_tag, rx->rx_dmamap);
+	}
+
+	/* Save pointer to buffer structure */
+	m_copyback(m, 0, 8, (void *)&rx);
+
+	error = bus_dmamap_load_mbuf_sg(sc->rxbuf_dma_tag, rx->rx_dmamap, m,
+	    segs, &nsegs, BUS_DMA_NOWAIT);
+	if (error != 0) {
+		device_printf(sc->dev,
+		    "cannot load RX DMA map %p, error = %d\n", rx, error);
+		m_freem(m);
+		return (error);
+	}
+
+	/* If nsegs is wrong then the stack is corrupt. */
+	KASSERT(nsegs == 1,
+	    ("%s: too many DMA segments (%d)", __func__, nsegs));
+	rx->rx_mbuf = m;
+
+	bus_dmamap_sync(sc->rxbuf_dma_tag, rx->rx_dmamap, BUS_DMASYNC_PREREAD);
+
+	rx->rx_bufdesc = LLAN_BUFDESC_VALID;
+	rx->rx_bufdesc |= (((uint64_t)segs[0].ds_len) << 32);
+	rx->rx_bufdesc |= segs[0].ds_addr;
+	error = phyp_hcall(H_ADD_LOGICAL_LAN_BUFFER, sc->unit, rx->rx_bufdesc);
+	if (error != 0) {
+		m_freem(m);
+		rx->rx_mbuf = NULL;
+		return (ENOBUFS);
+	}
+
+        return (0);
+}
+
+static void
+llan_intr(void *xsc)
+{
+	struct llan_softc *sc = xsc;
+	struct llan_xfer *rx;
+	struct mbuf *m;
+
+	mtx_lock(&sc->io_lock);
+restart:
+	phyp_hcall(H_VIO_SIGNAL, sc->unit, 0);
+
+	while ((sc->rx_buf[sc->rx_dma_slot].control >> 7) == sc->rx_valid_val) {
+		rx = (struct llan_xfer *)sc->rx_buf[sc->rx_dma_slot].handle;
+		m = rx->rx_mbuf;
+		m_adj(m, sc->rx_buf[sc->rx_dma_slot].offset - 8);
+		m->m_len = sc->rx_buf[sc->rx_dma_slot].length;
+
+		/* llan_add_rxbuf does DMA sync and unload as well as requeue */
+		if (llan_add_rxbuf(sc, rx) != 0) {
+			if_inc_counter(sc->ifp, IFCOUNTER_IERRORS, 1);
+			continue;
+		}
+
+		if_inc_counter(sc->ifp, IFCOUNTER_IPACKETS, 1);
+		m_adj(m, sc->rx_buf[sc->rx_dma_slot].offset);
+		m->m_len = sc->rx_buf[sc->rx_dma_slot].length;
+		m->m_pkthdr.rcvif = sc->ifp;
+		m->m_pkthdr.len = m->m_len;
+		sc->rx_dma_slot++;
+
+		if (sc->rx_dma_slot >= sc->rx_buf_len/sizeof(sc->rx_buf[0])) {
+			sc->rx_dma_slot = 0;
+			sc->rx_valid_val = !sc->rx_valid_val;
+		}
+
+		mtx_unlock(&sc->io_lock);
+		if_input(sc->ifp, m);
+		mtx_lock(&sc->io_lock);
+	}
+
+	phyp_hcall(H_VIO_SIGNAL, sc->unit, 1);
+
+	/*
+	 * H_VIO_SIGNAL enables interrupts for future packets only.
+	 * Make sure none were queued between the end of the loop and the
+	 * enable interrupts call.
+	 */
+	if ((sc->rx_buf[sc->rx_dma_slot].control >> 7) == sc->rx_valid_val)
+		goto restart;
+
+	mtx_unlock(&sc->io_lock);
+}
+
+static void
+llan_send_packet(void *xsc, bus_dma_segment_t *segs, int nsegs,
+    bus_size_t mapsize, int error)
+{
+	struct llan_softc *sc = xsc;
+	uint64_t bufdescs[6];
+	int i, err;
+
+	bzero(bufdescs, sizeof(bufdescs));
+
+	for (i = 0; i < nsegs; i++) {
+		bufdescs[i] = LLAN_BUFDESC_VALID;
+		bufdescs[i] |= (((uint64_t)segs[i].ds_len) << 32);
+		bufdescs[i] |= segs[i].ds_addr;
+	}
+
+	err = phyp_hcall(H_SEND_LOGICAL_LAN, sc->unit, bufdescs[0],
+	    bufdescs[1], bufdescs[2], bufdescs[3], bufdescs[4], bufdescs[5], 0);
+	/*
+	 * The hypercall returning implies completion -- or that the call will
+	 * not complete. In principle, we should try a few times if we get back
+	 * H_BUSY based on the continuation token in R4. For now, just drop
+	 * the packet in such cases.
+	 */
+	if (err == H_SUCCESS)
+		if_inc_counter(sc->ifp, IFCOUNTER_OPACKETS, 1);
+	else
+		if_inc_counter(sc->ifp, IFCOUNTER_OERRORS, 1);
+}
+
+static void
+llan_start_locked(struct ifnet *ifp)
+{
+	struct llan_softc *sc = if_getsoftc(ifp);
+	int nsegs;
+	struct mbuf *mb_head, *m;
+
+	mtx_assert(&sc->io_lock, MA_OWNED);
+
+	if ((if_getdrvflags(ifp) & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) !=
+	    IFF_DRV_RUNNING)
+		return;
+
+	while (!if_sendq_empty(ifp)) {
+		mb_head = if_dequeue(ifp);
+
+		if (mb_head == NULL)
+			break;
+
+		BPF_MTAP(ifp, mb_head);
+
+		for (m = mb_head, nsegs = 0; m != NULL; m = m->m_next)
+			nsegs++;
+		if (nsegs > 6) {
+			m = m_collapse(mb_head, M_NOWAIT, 6);
+			if (m == NULL) {
+				m_freem(mb_head);
+				continue;
+			}
+		}
+
+		bus_dmamap_load_mbuf(sc->tx_dma_tag, sc->tx_dma_map,
+			mb_head, llan_send_packet, sc, 0);
+		bus_dmamap_unload(sc->tx_dma_tag, sc->tx_dma_map);
+		m_freem(mb_head);
+	}
+}
+
+static void
+llan_start(struct ifnet *ifp)
+{
+	struct llan_softc *sc = if_getsoftc(ifp);
+
+	mtx_lock(&sc->io_lock);
+	llan_start_locked(ifp);
+	mtx_unlock(&sc->io_lock);
+}
+
+static u_int
+llan_set_maddr(void *arg, struct sockaddr_dl *sdl, u_int cnt)
+{
+	struct llan_softc *sc = arg;
+	uint64_t macaddr = 0;
+
+	memcpy((uint8_t *)&macaddr + 2, LLADDR(sdl), 6);
+	phyp_hcall(H_MULTICAST_CTRL, sc->unit, LLAN_ADD_MULTICAST, macaddr);
+
+	return (1);
+}
+
+static int
+llan_set_multicast(struct llan_softc *sc)
+{
+	struct ifnet *ifp = sc->ifp;
+
+	mtx_assert(&sc->io_lock, MA_OWNED);
+
+	phyp_hcall(H_MULTICAST_CTRL, sc->unit, LLAN_CLEAR_MULTICAST, 0);
+
+	if_foreach_llmaddr(ifp, llan_set_maddr, sc);
+
+	return (0);
+}
+
+static int
+llan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
+{
+	int err = 0;
+	struct llan_softc *sc = if_getsoftc(ifp);
+
+	switch (cmd) {
+	case SIOCADDMULTI:
+	case SIOCDELMULTI:
+		mtx_lock(&sc->io_lock);
+		if ((if_getdrvflags(sc->ifp) & IFF_DRV_RUNNING) != 0)
+			llan_set_multicast(sc);
+		mtx_unlock(&sc->io_lock);
+		break;
+	case SIOCGIFMEDIA:
+	case SIOCSIFMEDIA:
+		err = ifmedia_ioctl(ifp, (struct ifreq *)data, &sc->media, cmd);
+		break;
+	case SIOCSIFFLAGS:
+	default:
+		err = ether_ioctl(ifp, cmd, data);
+		break;
+	}
+
+	return (err);
+}