freebsd-dev/sys/powerpc/pseries/phyp_llan.c
Nathan Whitehorn e68826d293 Provide link state reporting so that ifconfig_llan0="DHCP" works. The
reported link state is fictional (always up) since the hypervisor does
not provide this information.

MFC after:	1 week
2015-12-19 02:16:38 +00:00

551 lines
14 KiB
C

/*-
* 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/cdefs.h>
__FBSDID("$FreeBSD$");
#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 devclass_t llan_devclass;
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, llan_devclass, 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 error, i;
sc = device_get_softc(dev);
sc->dev = dev;
/* Get firmware properties */
node = ofw_bus_get_node(dev);
OF_getprop(node, "local-mac-address", sc->mac_address,
sizeof(sc->mac_address));
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_MISC | INTR_MPSAFE |
INTR_ENTROPY, NULL, llan_intr, sc, &sc->irq_cookie);
/* Setup DMA */
error = 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);
error = 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);
error = 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);
error = bus_dmamem_alloc(sc->rx_dma_tag, (void **)&sc->rx_buf,
BUS_DMA_WAITOK | BUS_DMA_ZERO, &sc->rx_buf_map);
error = 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++) {
error = 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);
sc->ifp->if_softc = sc;
if_initname(sc->ifp, device_get_name(dev), device_get_unit(dev));
sc->ifp->if_mtu = ETHERMTU; /* XXX max-frame-size from OF? */
sc->ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
sc->ifp->if_hwassist = 0; /* XXX: ibm,illan-options */
sc->ifp->if_capabilities = 0;
sc->ifp->if_capenable = 0;
sc->ifp->if_start = llan_start;
sc->ifp->if_ioctl = llan_ioctl;
sc->ifp->if_init = 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);
IFQ_SET_MAXLEN(&sc->ifp->if_snd, LLAN_MAX_TX_PACKETS);
sc->ifp->if_snd.ifq_drv_maxlen = LLAN_MAX_TX_PACKETS;
IFQ_SET_READY(&sc->ifp->if_snd);
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 = ifp->if_softc;
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 err, 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);
err = 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 */
sc->ifp->if_drv_flags |= IFF_DRV_RUNNING;
sc->ifp->if_drv_flags &= ~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);
phyp_hcall(H_ADD_LOGICAL_LAN_BUFFER, sc->unit,
rx->rx_bufdesc);
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);
(*sc->ifp->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;
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;
}
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.
*/
}
static void
llan_start_locked(struct ifnet *ifp)
{
struct llan_softc *sc = ifp->if_softc;
bus_addr_t first;
int nsegs;
struct mbuf *mb_head, *m;
mtx_assert(&sc->io_lock, MA_OWNED);
first = 0;
if ((ifp->if_drv_flags & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) !=
IFF_DRV_RUNNING)
return;
while (!IFQ_DRV_IS_EMPTY(&ifp->if_snd)) {
IFQ_DRV_DEQUEUE(&ifp->if_snd, mb_head);
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 = ifp->if_softc;
mtx_lock(&sc->io_lock);
llan_start_locked(ifp);
mtx_unlock(&sc->io_lock);
}
static int
llan_set_multicast(struct llan_softc *sc)
{
struct ifnet *ifp = sc->ifp;
struct ifmultiaddr *inm;
uint64_t macaddr;
mtx_assert(&sc->io_lock, MA_OWNED);
phyp_hcall(H_MULTICAST_CTRL, sc->unit, LLAN_CLEAR_MULTICAST, 0);
if_maddr_rlock(ifp);
TAILQ_FOREACH(inm, &ifp->if_multiaddrs, ifma_link) {
if (inm->ifma_addr->sa_family != AF_LINK)
continue;
memcpy((uint8_t *)&macaddr + 2,
LLADDR((struct sockaddr_dl *)inm->ifma_addr), 6);
phyp_hcall(H_MULTICAST_CTRL, sc->unit, LLAN_ADD_MULTICAST,
macaddr);
}
if_maddr_runlock(ifp);
return (0);
}
static int
llan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
int err = 0;
struct llan_softc *sc = ifp->if_softc;
switch (cmd) {
case SIOCADDMULTI:
case SIOCDELMULTI:
mtx_lock(&sc->io_lock);
if ((sc->ifp->if_drv_flags & 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);
}