/
if_vio.c
1477 lines (1294 loc) · 38.3 KB
/
if_vio.c
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/* $OpenBSD: if_vio.c,v 1.16 2019/12/31 10:05:33 mpi Exp $ */
/*
* Copyright (c) 2012 Stefan Fritsch, Alexander Fiveg.
* Copyright (c) 2010 Minoura Makoto.
* 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 ``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 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 "bpfilter.h"
#include "vlan.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/timeout.h>
#include <dev/pv/virtioreg.h>
#include <dev/pv/virtiovar.h>
#include <net/if.h>
#include <net/if_media.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>
#include <netinet/udp.h>
#if NBPFILTER > 0
#include <net/bpf.h>
#endif
#if VIRTIO_DEBUG
#define DPRINTF(x...) printf(x)
#else
#define DPRINTF(x...)
#endif
/*
* if_vioreg.h:
*/
/* Configuration registers */
#define VIRTIO_NET_CONFIG_MAC 0 /* 8bit x 6byte */
#define VIRTIO_NET_CONFIG_STATUS 6 /* 16bit */
/* Feature bits */
#define VIRTIO_NET_F_CSUM (1ULL<<0)
#define VIRTIO_NET_F_GUEST_CSUM (1ULL<<1)
#define VIRTIO_NET_F_CTRL_GUEST_OFFLOADS (1ULL<<2)
#define VIRTIO_NET_F_MTU (1ULL<<3)
#define VIRTIO_NET_F_MAC (1ULL<<5)
#define VIRTIO_NET_F_GSO (1ULL<<6)
#define VIRTIO_NET_F_GUEST_TSO4 (1ULL<<7)
#define VIRTIO_NET_F_GUEST_TSO6 (1ULL<<8)
#define VIRTIO_NET_F_GUEST_ECN (1ULL<<9)
#define VIRTIO_NET_F_GUEST_UFO (1ULL<<10)
#define VIRTIO_NET_F_HOST_TSO4 (1ULL<<11)
#define VIRTIO_NET_F_HOST_TSO6 (1ULL<<12)
#define VIRTIO_NET_F_HOST_ECN (1ULL<<13)
#define VIRTIO_NET_F_HOST_UFO (1ULL<<14)
#define VIRTIO_NET_F_MRG_RXBUF (1ULL<<15)
#define VIRTIO_NET_F_STATUS (1ULL<<16)
#define VIRTIO_NET_F_CTRL_VQ (1ULL<<17)
#define VIRTIO_NET_F_CTRL_RX (1ULL<<18)
#define VIRTIO_NET_F_CTRL_VLAN (1ULL<<19)
#define VIRTIO_NET_F_CTRL_RX_EXTRA (1ULL<<20)
#define VIRTIO_NET_F_GUEST_ANNOUNCE (1ULL<<21)
#define VIRTIO_NET_F_MQ (1ULL<<22)
#define VIRTIO_NET_F_CTRL_MAC_ADDR (1ULL<<23)
/*
* Config(8) flags. The lowest byte is reserved for generic virtio stuff.
*/
/* Workaround for vlan related bug in qemu < version 2.0 */
#define CONFFLAG_QEMU_VLAN_BUG (1<<8)
static const struct virtio_feature_name virtio_net_feature_names[] = {
#if VIRTIO_DEBUG
{ VIRTIO_NET_F_CSUM, "CSum" },
{ VIRTIO_NET_F_GUEST_CSUM, "GuestCSum" },
{ VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, "CtrlGuestOffl" },
{ VIRTIO_NET_F_MTU, "MTU", },
{ VIRTIO_NET_F_MAC, "MAC" },
{ VIRTIO_NET_F_GSO, "GSO" },
{ VIRTIO_NET_F_GUEST_TSO4, "GuestTSO4" },
{ VIRTIO_NET_F_GUEST_TSO6, "GuestTSO6" },
{ VIRTIO_NET_F_GUEST_ECN, "GuestECN" },
{ VIRTIO_NET_F_GUEST_UFO, "GuestUFO" },
{ VIRTIO_NET_F_HOST_TSO4, "HostTSO4" },
{ VIRTIO_NET_F_HOST_TSO6, "HostTSO6" },
{ VIRTIO_NET_F_HOST_ECN, "HostECN" },
{ VIRTIO_NET_F_HOST_UFO, "HostUFO" },
{ VIRTIO_NET_F_MRG_RXBUF, "MrgRXBuf" },
{ VIRTIO_NET_F_STATUS, "Status" },
{ VIRTIO_NET_F_CTRL_VQ, "CtrlVQ" },
{ VIRTIO_NET_F_CTRL_RX, "CtrlRX" },
{ VIRTIO_NET_F_CTRL_VLAN, "CtrlVLAN" },
{ VIRTIO_NET_F_CTRL_RX_EXTRA, "CtrlRXExtra" },
{ VIRTIO_NET_F_GUEST_ANNOUNCE, "GuestAnnounce" },
{ VIRTIO_NET_F_MQ, "MQ" },
{ VIRTIO_NET_F_CTRL_MAC_ADDR, "CtrlMAC" },
#endif
{ 0, NULL }
};
/* Status */
#define VIRTIO_NET_S_LINK_UP 1
/* Packet header structure */
struct virtio_net_hdr {
uint8_t flags;
uint8_t gso_type;
uint16_t hdr_len;
uint16_t gso_size;
uint16_t csum_start;
uint16_t csum_offset;
/* only present if VIRTIO_NET_F_MRG_RXBUF is negotiated */
uint16_t num_buffers;
} __packed;
#define VIRTIO_NET_HDR_F_NEEDS_CSUM 1 /* flags */
#define VIRTIO_NET_HDR_GSO_NONE 0 /* gso_type */
#define VIRTIO_NET_HDR_GSO_TCPV4 1 /* gso_type */
#define VIRTIO_NET_HDR_GSO_UDP 3 /* gso_type */
#define VIRTIO_NET_HDR_GSO_TCPV6 4 /* gso_type */
#define VIRTIO_NET_HDR_GSO_ECN 0x80 /* gso_type, |'ed */
#define VIRTIO_NET_MAX_GSO_LEN (65536+ETHER_HDR_LEN)
/* Control virtqueue */
struct virtio_net_ctrl_cmd {
uint8_t class;
uint8_t command;
} __packed;
#define VIRTIO_NET_CTRL_RX 0
# define VIRTIO_NET_CTRL_RX_PROMISC 0
# define VIRTIO_NET_CTRL_RX_ALLMULTI 1
#define VIRTIO_NET_CTRL_MAC 1
# define VIRTIO_NET_CTRL_MAC_TABLE_SET 0
#define VIRTIO_NET_CTRL_VLAN 2
# define VIRTIO_NET_CTRL_VLAN_ADD 0
# define VIRTIO_NET_CTRL_VLAN_DEL 1
struct virtio_net_ctrl_status {
uint8_t ack;
} __packed;
#define VIRTIO_NET_OK 0
#define VIRTIO_NET_ERR 1
struct virtio_net_ctrl_rx {
uint8_t onoff;
} __packed;
struct virtio_net_ctrl_mac_tbl {
uint32_t nentries;
uint8_t macs[][ETHER_ADDR_LEN];
} __packed;
struct virtio_net_ctrl_vlan {
uint16_t id;
} __packed;
/*
* if_viovar.h:
*/
enum vio_ctrl_state {
FREE, INUSE, DONE, RESET
};
struct vio_softc {
struct device sc_dev;
struct virtio_softc *sc_virtio;
#define VQRX 0
#define VQTX 1
#define VQCTL 2
struct virtqueue sc_vq[3];
struct arpcom sc_ac;
struct ifmedia sc_media;
short sc_ifflags;
/* bus_dmamem */
bus_dma_segment_t sc_dma_seg;
bus_dmamap_t sc_dma_map;
size_t sc_dma_size;
caddr_t sc_dma_kva;
int sc_hdr_size;
struct virtio_net_hdr *sc_tx_hdrs;
struct virtio_net_ctrl_cmd *sc_ctrl_cmd;
struct virtio_net_ctrl_status *sc_ctrl_status;
struct virtio_net_ctrl_rx *sc_ctrl_rx;
struct virtio_net_ctrl_mac_tbl *sc_ctrl_mac_tbl_uc;
#define sc_ctrl_mac_info sc_ctrl_mac_tbl_uc
struct virtio_net_ctrl_mac_tbl *sc_ctrl_mac_tbl_mc;
/* kmem */
bus_dmamap_t *sc_arrays;
#define sc_rx_dmamaps sc_arrays
bus_dmamap_t *sc_tx_dmamaps;
struct mbuf **sc_rx_mbufs;
struct mbuf **sc_tx_mbufs;
struct if_rxring sc_rx_ring;
enum vio_ctrl_state sc_ctrl_inuse;
struct timeout sc_txtick, sc_rxtick;
};
#define VIO_DMAMEM_OFFSET(sc, p) ((caddr_t)(p) - (sc)->sc_dma_kva)
#define VIO_DMAMEM_SYNC(vsc, sc, p, size, flags) \
bus_dmamap_sync((vsc)->sc_dmat, (sc)->sc_dma_map, \
VIO_DMAMEM_OFFSET((sc), (p)), (size), (flags))
#define VIO_DMAMEM_ENQUEUE(sc, vq, slot, p, size, write) \
virtio_enqueue_p((vq), (slot), (sc)->sc_dma_map, \
VIO_DMAMEM_OFFSET((sc), (p)), (size), (write))
#define VIO_HAVE_MRG_RXBUF(sc) \
((sc)->sc_hdr_size == sizeof(struct virtio_net_hdr))
#define VIRTIO_NET_TX_MAXNSEGS 16 /* for larger chains, defrag */
#define VIRTIO_NET_CTRL_MAC_MC_ENTRIES 64 /* for more entries, use ALLMULTI */
#define VIRTIO_NET_CTRL_MAC_UC_ENTRIES 1 /* one entry for own unicast addr */
#define VIO_CTRL_MAC_INFO_SIZE \
(2*sizeof(struct virtio_net_ctrl_mac_tbl) + \
(VIRTIO_NET_CTRL_MAC_MC_ENTRIES + \
VIRTIO_NET_CTRL_MAC_UC_ENTRIES) * ETHER_ADDR_LEN)
/* cfattach interface functions */
int vio_match(struct device *, void *, void *);
void vio_attach(struct device *, struct device *, void *);
/* ifnet interface functions */
int vio_init(struct ifnet *);
void vio_stop(struct ifnet *, int);
void vio_start(struct ifnet *);
int vio_ioctl(struct ifnet *, u_long, caddr_t);
void vio_get_lladr(struct arpcom *ac, struct virtio_softc *vsc);
void vio_put_lladr(struct arpcom *ac, struct virtio_softc *vsc);
/* rx */
int vio_add_rx_mbuf(struct vio_softc *, int);
void vio_free_rx_mbuf(struct vio_softc *, int);
void vio_populate_rx_mbufs(struct vio_softc *);
int vio_rxeof(struct vio_softc *);
int vio_rx_intr(struct virtqueue *);
void vio_rx_drain(struct vio_softc *);
void vio_rxtick(void *);
/* tx */
int vio_tx_intr(struct virtqueue *);
int vio_txeof(struct virtqueue *);
void vio_tx_drain(struct vio_softc *);
int vio_encap(struct vio_softc *, int, struct mbuf *);
void vio_txtick(void *);
/* other control */
void vio_link_state(struct ifnet *);
int vio_config_change(struct virtio_softc *);
int vio_ctrl_rx(struct vio_softc *, int, int);
int vio_set_rx_filter(struct vio_softc *);
void vio_iff(struct vio_softc *);
int vio_media_change(struct ifnet *);
void vio_media_status(struct ifnet *, struct ifmediareq *);
int vio_ctrleof(struct virtqueue *);
int vio_wait_ctrl(struct vio_softc *sc);
int vio_wait_ctrl_done(struct vio_softc *sc);
void vio_ctrl_wakeup(struct vio_softc *, enum vio_ctrl_state);
int vio_alloc_mem(struct vio_softc *);
int vio_alloc_dmamem(struct vio_softc *);
void vio_free_dmamem(struct vio_softc *);
#if VIRTIO_DEBUG
void vio_dump(struct vio_softc *);
#endif
int
vio_match(struct device *parent, void *match, void *aux)
{
struct virtio_softc *va = aux;
if (va->sc_childdevid == PCI_PRODUCT_VIRTIO_NETWORK)
return 1;
return 0;
}
struct cfattach vio_ca = {
sizeof(struct vio_softc), vio_match, vio_attach, NULL
};
struct cfdriver vio_cd = {
NULL, "vio", DV_IFNET
};
int
vio_alloc_dmamem(struct vio_softc *sc)
{
struct virtio_softc *vsc = sc->sc_virtio;
int nsegs;
if (bus_dmamap_create(vsc->sc_dmat, sc->sc_dma_size, 1,
sc->sc_dma_size, 0, BUS_DMA_NOWAIT | BUS_DMA_ALLOCNOW,
&sc->sc_dma_map) != 0)
goto err;
if (bus_dmamem_alloc(vsc->sc_dmat, sc->sc_dma_size, 16, 0,
&sc->sc_dma_seg, 1, &nsegs, BUS_DMA_NOWAIT | BUS_DMA_ZERO) != 0)
goto destroy;
if (bus_dmamem_map(vsc->sc_dmat, &sc->sc_dma_seg, nsegs,
sc->sc_dma_size, &sc->sc_dma_kva, BUS_DMA_NOWAIT) != 0)
goto free;
if (bus_dmamap_load(vsc->sc_dmat, sc->sc_dma_map, sc->sc_dma_kva,
sc->sc_dma_size, NULL, BUS_DMA_NOWAIT) != 0)
goto unmap;
return (0);
unmap:
bus_dmamem_unmap(vsc->sc_dmat, sc->sc_dma_kva, sc->sc_dma_size);
free:
bus_dmamem_free(vsc->sc_dmat, &sc->sc_dma_seg, 1);
destroy:
bus_dmamap_destroy(vsc->sc_dmat, sc->sc_dma_map);
err:
return (1);
}
void
vio_free_dmamem(struct vio_softc *sc)
{
struct virtio_softc *vsc = sc->sc_virtio;
bus_dmamap_unload(vsc->sc_dmat, sc->sc_dma_map);
bus_dmamem_unmap(vsc->sc_dmat, sc->sc_dma_kva, sc->sc_dma_size);
bus_dmamem_free(vsc->sc_dmat, &sc->sc_dma_seg, 1);
bus_dmamap_destroy(vsc->sc_dmat, sc->sc_dma_map);
}
/* allocate memory */
/*
* dma memory is used for:
* sc_tx_hdrs[slot]: metadata array for frames to be sent (WRITE)
* sc_ctrl_cmd: command to be sent via ctrl vq (WRITE)
* sc_ctrl_status: return value for a command via ctrl vq (READ)
* sc_ctrl_rx: parameter for a VIRTIO_NET_CTRL_RX class command
* (WRITE)
* sc_ctrl_mac_tbl_uc: unicast MAC address filter for a VIRTIO_NET_CTRL_MAC
* class command (WRITE)
* sc_ctrl_mac_tbl_mc: multicast MAC address filter for a VIRTIO_NET_CTRL_MAC
* class command (WRITE)
* sc_ctrl_* structures are allocated only one each; they are protected by
* sc_ctrl_inuse, which must only be accessed at splnet
*
* metadata headers for received frames are stored at the start of the
* rx mbufs.
*/
/*
* dynamically allocated memory is used for:
* sc_rx_dmamaps[slot]: bus_dmamap_t array for received payload
* sc_tx_dmamaps[slot]: bus_dmamap_t array for sent payload
* sc_rx_mbufs[slot]: mbuf pointer array for received frames
* sc_tx_mbufs[slot]: mbuf pointer array for sent frames
*/
int
vio_alloc_mem(struct vio_softc *sc)
{
struct virtio_softc *vsc = sc->sc_virtio;
struct ifnet *ifp = &sc->sc_ac.ac_if;
int allocsize, r, i, txsize;
unsigned int offset = 0;
int rxqsize, txqsize;
caddr_t kva;
rxqsize = vsc->sc_vqs[0].vq_num;
txqsize = vsc->sc_vqs[1].vq_num;
/*
* For simplicity, we always allocate the full virtio_net_hdr size
* even if VIRTIO_NET_F_MRG_RXBUF is not negotiated and
* only a part of the memory is ever used.
*/
allocsize = sizeof(struct virtio_net_hdr) * txqsize;
if (vsc->sc_nvqs == 3) {
allocsize += sizeof(struct virtio_net_ctrl_cmd) * 1;
allocsize += sizeof(struct virtio_net_ctrl_status) * 1;
allocsize += sizeof(struct virtio_net_ctrl_rx) * 1;
allocsize += VIO_CTRL_MAC_INFO_SIZE;
}
sc->sc_dma_size = allocsize;
if (vio_alloc_dmamem(sc) != 0) {
printf("unable to allocate dma region\n");
return -1;
}
kva = sc->sc_dma_kva;
sc->sc_tx_hdrs = (struct virtio_net_hdr*)(kva + offset);
offset += sizeof(struct virtio_net_hdr) * txqsize;
if (vsc->sc_nvqs == 3) {
sc->sc_ctrl_cmd = (void*)(kva + offset);
offset += sizeof(*sc->sc_ctrl_cmd);
sc->sc_ctrl_status = (void*)(kva + offset);
offset += sizeof(*sc->sc_ctrl_status);
sc->sc_ctrl_rx = (void*)(kva + offset);
offset += sizeof(*sc->sc_ctrl_rx);
sc->sc_ctrl_mac_tbl_uc = (void*)(kva + offset);
offset += sizeof(*sc->sc_ctrl_mac_tbl_uc) +
ETHER_ADDR_LEN * VIRTIO_NET_CTRL_MAC_UC_ENTRIES;
sc->sc_ctrl_mac_tbl_mc = (void*)(kva + offset);
}
sc->sc_arrays = mallocarray(rxqsize + txqsize,
2 * sizeof(bus_dmamap_t) + sizeof(struct mbuf *), M_DEVBUF,
M_WAITOK | M_CANFAIL | M_ZERO);
if (sc->sc_arrays == NULL) {
printf("unable to allocate mem for dmamaps\n");
goto err_hdr;
}
allocsize = (rxqsize + txqsize) *
(2 * sizeof(bus_dmamap_t) + sizeof(struct mbuf *));
sc->sc_tx_dmamaps = sc->sc_arrays + rxqsize;
sc->sc_rx_mbufs = (void*) (sc->sc_tx_dmamaps + txqsize);
sc->sc_tx_mbufs = sc->sc_rx_mbufs + rxqsize;
for (i = 0; i < rxqsize; i++) {
r = bus_dmamap_create(vsc->sc_dmat, MCLBYTES, 1, MCLBYTES, 0,
BUS_DMA_NOWAIT|BUS_DMA_ALLOCNOW, &sc->sc_rx_dmamaps[i]);
if (r != 0)
goto err_reqs;
}
txsize = ifp->if_hardmtu + sc->sc_hdr_size + ETHER_HDR_LEN;
for (i = 0; i < txqsize; i++) {
r = bus_dmamap_create(vsc->sc_dmat, txsize,
VIRTIO_NET_TX_MAXNSEGS, txsize, 0,
BUS_DMA_NOWAIT|BUS_DMA_ALLOCNOW,
&sc->sc_tx_dmamaps[i]);
if (r != 0)
goto err_reqs;
}
return 0;
err_reqs:
printf("dmamap creation failed, error %d\n", r);
for (i = 0; i < txqsize; i++) {
if (sc->sc_tx_dmamaps[i])
bus_dmamap_destroy(vsc->sc_dmat, sc->sc_tx_dmamaps[i]);
}
for (i = 0; i < rxqsize; i++) {
if (sc->sc_rx_dmamaps[i])
bus_dmamap_destroy(vsc->sc_dmat, sc->sc_rx_dmamaps[i]);
}
if (sc->sc_arrays) {
free(sc->sc_arrays, M_DEVBUF, allocsize);
sc->sc_arrays = 0;
}
err_hdr:
vio_free_dmamem(sc);
return -1;
}
void
vio_get_lladr(struct arpcom *ac, struct virtio_softc *vsc)
{
int i;
for (i = 0; i < ETHER_ADDR_LEN; i++) {
ac->ac_enaddr[i] = virtio_read_device_config_1(vsc,
VIRTIO_NET_CONFIG_MAC + i);
}
}
void
vio_put_lladr(struct arpcom *ac, struct virtio_softc *vsc)
{
int i;
for (i = 0; i < ETHER_ADDR_LEN; i++) {
virtio_write_device_config_1(vsc, VIRTIO_NET_CONFIG_MAC + i,
ac->ac_enaddr[i]);
}
}
void
vio_attach(struct device *parent, struct device *self, void *aux)
{
struct vio_softc *sc = (struct vio_softc *)self;
struct virtio_softc *vsc = (struct virtio_softc *)parent;
int i;
struct ifnet *ifp = &sc->sc_ac.ac_if;
if (vsc->sc_child != NULL) {
printf(": child already attached for %s; something wrong...\n",
parent->dv_xname);
return;
}
sc->sc_virtio = vsc;
vsc->sc_child = self;
vsc->sc_ipl = IPL_NET;
vsc->sc_vqs = &sc->sc_vq[0];
vsc->sc_config_change = 0;
vsc->sc_driver_features = VIRTIO_NET_F_MAC | VIRTIO_NET_F_STATUS |
VIRTIO_NET_F_CTRL_VQ | VIRTIO_NET_F_CTRL_RX |
VIRTIO_NET_F_MRG_RXBUF | VIRTIO_NET_F_CSUM |
VIRTIO_F_RING_EVENT_IDX;
virtio_negotiate_features(vsc, virtio_net_feature_names);
if (virtio_has_feature(vsc, VIRTIO_NET_F_MAC)) {
vio_get_lladr(&sc->sc_ac, vsc);
} else {
ether_fakeaddr(ifp);
vio_put_lladr(&sc->sc_ac, vsc);
}
printf(": address %s\n", ether_sprintf(sc->sc_ac.ac_enaddr));
if (virtio_has_feature(vsc, VIRTIO_NET_F_MRG_RXBUF) ||
vsc->sc_version_1) {
sc->sc_hdr_size = sizeof(struct virtio_net_hdr);
} else {
sc->sc_hdr_size = offsetof(struct virtio_net_hdr, num_buffers);
}
if (virtio_has_feature(vsc, VIRTIO_NET_F_MRG_RXBUF))
ifp->if_hardmtu = 16000; /* arbitrary limit */
else
ifp->if_hardmtu = MCLBYTES - sc->sc_hdr_size - ETHER_HDR_LEN;
if (virtio_alloc_vq(vsc, &sc->sc_vq[VQRX], 0, MCLBYTES, 2, "rx") != 0)
goto err;
vsc->sc_nvqs = 1;
sc->sc_vq[VQRX].vq_done = vio_rx_intr;
if (virtio_alloc_vq(vsc, &sc->sc_vq[VQTX], 1,
sc->sc_hdr_size + ifp->if_hardmtu + ETHER_HDR_LEN,
VIRTIO_NET_TX_MAXNSEGS + 1, "tx") != 0) {
goto err;
}
vsc->sc_nvqs = 2;
sc->sc_vq[VQTX].vq_done = vio_tx_intr;
virtio_start_vq_intr(vsc, &sc->sc_vq[VQRX]);
if (virtio_has_feature(vsc, VIRTIO_F_RING_EVENT_IDX))
virtio_postpone_intr_far(&sc->sc_vq[VQTX]);
else
virtio_stop_vq_intr(vsc, &sc->sc_vq[VQTX]);
if (virtio_has_feature(vsc, VIRTIO_NET_F_CTRL_VQ)
&& virtio_has_feature(vsc, VIRTIO_NET_F_CTRL_RX)) {
if (virtio_alloc_vq(vsc, &sc->sc_vq[VQCTL], 2, NBPG, 1,
"control") == 0) {
sc->sc_vq[VQCTL].vq_done = vio_ctrleof;
virtio_start_vq_intr(vsc, &sc->sc_vq[VQCTL]);
vsc->sc_nvqs = 3;
}
}
if (vio_alloc_mem(sc) < 0)
goto err;
strlcpy(ifp->if_xname, self->dv_xname, IFNAMSIZ);
ifp->if_softc = sc;
ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
ifp->if_start = vio_start;
ifp->if_ioctl = vio_ioctl;
ifp->if_capabilities = IFCAP_VLAN_MTU;
if (virtio_has_feature(vsc, VIRTIO_NET_F_CSUM))
ifp->if_capabilities |= IFCAP_CSUM_TCPv4|IFCAP_CSUM_UDPv4;
IFQ_SET_MAXLEN(&ifp->if_snd, vsc->sc_vqs[1].vq_num - 1);
ifmedia_init(&sc->sc_media, 0, vio_media_change, vio_media_status);
ifmedia_add(&sc->sc_media, IFM_ETHER | IFM_AUTO, 0, NULL);
ifmedia_set(&sc->sc_media, IFM_ETHER | IFM_AUTO);
vsc->sc_config_change = vio_config_change;
timeout_set(&sc->sc_txtick, vio_txtick, &sc->sc_vq[VQTX]);
timeout_set(&sc->sc_rxtick, vio_rxtick, &sc->sc_vq[VQRX]);
if_attach(ifp);
ether_ifattach(ifp);
return;
err:
for (i = 0; i < vsc->sc_nvqs; i++)
virtio_free_vq(vsc, &sc->sc_vq[i]);
vsc->sc_nvqs = 0;
vsc->sc_child = VIRTIO_CHILD_ERROR;
return;
}
/* check link status */
void
vio_link_state(struct ifnet *ifp)
{
struct vio_softc *sc = ifp->if_softc;
struct virtio_softc *vsc = sc->sc_virtio;
int link_state = LINK_STATE_FULL_DUPLEX;
if (virtio_has_feature(vsc, VIRTIO_NET_F_STATUS)) {
int status = virtio_read_device_config_2(vsc,
VIRTIO_NET_CONFIG_STATUS);
if (!(status & VIRTIO_NET_S_LINK_UP))
link_state = LINK_STATE_DOWN;
}
if (ifp->if_link_state != link_state) {
ifp->if_link_state = link_state;
if_link_state_change(ifp);
}
}
int
vio_config_change(struct virtio_softc *vsc)
{
struct vio_softc *sc = (struct vio_softc *)vsc->sc_child;
vio_link_state(&sc->sc_ac.ac_if);
return 1;
}
int
vio_media_change(struct ifnet *ifp)
{
/* Ignore */
return (0);
}
void
vio_media_status(struct ifnet *ifp, struct ifmediareq *imr)
{
imr->ifm_active = IFM_ETHER | IFM_AUTO;
imr->ifm_status = IFM_AVALID;
vio_link_state(ifp);
if (LINK_STATE_IS_UP(ifp->if_link_state) && ifp->if_flags & IFF_UP)
imr->ifm_status |= IFM_ACTIVE|IFM_FDX;
}
/*
* Interface functions for ifnet
*/
int
vio_init(struct ifnet *ifp)
{
struct vio_softc *sc = ifp->if_softc;
vio_stop(ifp, 0);
if_rxr_init(&sc->sc_rx_ring, 2 * ((ifp->if_hardmtu / MCLBYTES) + 1),
sc->sc_vq[VQRX].vq_num);
vio_populate_rx_mbufs(sc);
ifp->if_flags |= IFF_RUNNING;
ifq_clr_oactive(&ifp->if_snd);
vio_iff(sc);
vio_link_state(ifp);
return 0;
}
void
vio_stop(struct ifnet *ifp, int disable)
{
struct vio_softc *sc = ifp->if_softc;
struct virtio_softc *vsc = sc->sc_virtio;
timeout_del(&sc->sc_txtick);
timeout_del(&sc->sc_rxtick);
ifp->if_flags &= ~IFF_RUNNING;
ifq_clr_oactive(&ifp->if_snd);
/* only way to stop I/O and DMA is resetting... */
virtio_reset(vsc);
vio_rxeof(sc);
if (vsc->sc_nvqs >= 3)
vio_ctrleof(&sc->sc_vq[VQCTL]);
vio_tx_drain(sc);
if (disable)
vio_rx_drain(sc);
virtio_reinit_start(vsc);
virtio_start_vq_intr(vsc, &sc->sc_vq[VQRX]);
virtio_stop_vq_intr(vsc, &sc->sc_vq[VQTX]);
if (vsc->sc_nvqs >= 3)
virtio_start_vq_intr(vsc, &sc->sc_vq[VQCTL]);
virtio_reinit_end(vsc);
if (vsc->sc_nvqs >= 3) {
if (sc->sc_ctrl_inuse != FREE)
sc->sc_ctrl_inuse = RESET;
wakeup(&sc->sc_ctrl_inuse);
}
}
void
vio_start(struct ifnet *ifp)
{
struct vio_softc *sc = ifp->if_softc;
struct virtio_softc *vsc = sc->sc_virtio;
struct virtqueue *vq = &sc->sc_vq[VQTX];
struct mbuf *m;
int queued = 0;
vio_txeof(vq);
if (!(ifp->if_flags & IFF_RUNNING) || ifq_is_oactive(&ifp->if_snd))
return;
if (IFQ_IS_EMPTY(&ifp->if_snd))
return;
again:
for (;;) {
int slot, r;
struct virtio_net_hdr *hdr;
m = ifq_deq_begin(&ifp->if_snd);
if (m == NULL)
break;
r = virtio_enqueue_prep(vq, &slot);
if (r == EAGAIN) {
ifq_deq_rollback(&ifp->if_snd, m);
ifq_set_oactive(&ifp->if_snd);
break;
}
if (r != 0)
panic("enqueue_prep for a tx buffer: %d", r);
hdr = &sc->sc_tx_hdrs[slot];
memset(hdr, 0, sc->sc_hdr_size);
if (m->m_pkthdr.csum_flags & (M_TCP_CSUM_OUT|M_UDP_CSUM_OUT)) {
struct mbuf *mip;
struct ip *ip;
int ehdrlen = ETHER_HDR_LEN;
int ipoff;
#if NVLAN > 0
struct ether_vlan_header *eh;
eh = mtod(m, struct ether_vlan_header *);
if (eh->evl_encap_proto == htons(ETHERTYPE_VLAN))
ehdrlen += ETHER_VLAN_ENCAP_LEN;
#endif
if (m->m_pkthdr.csum_flags & M_TCP_CSUM_OUT)
hdr->csum_offset = offsetof(struct tcphdr, th_sum);
else
hdr->csum_offset = offsetof(struct udphdr, uh_sum);
mip = m_getptr(m, ehdrlen, &ipoff);
KASSERT(mip != NULL && mip->m_len - ipoff >= sizeof(*ip));
ip = (struct ip *)(mip->m_data + ipoff);
hdr->csum_start = ehdrlen + (ip->ip_hl << 2);
hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
}
r = vio_encap(sc, slot, m);
if (r != 0) {
virtio_enqueue_abort(vq, slot);
ifq_deq_commit(&ifp->if_snd, m);
m_freem(m);
ifp->if_oerrors++;
continue;
}
r = virtio_enqueue_reserve(vq, slot,
sc->sc_tx_dmamaps[slot]->dm_nsegs + 1);
if (r != 0) {
bus_dmamap_unload(vsc->sc_dmat,
sc->sc_tx_dmamaps[slot]);
ifq_deq_rollback(&ifp->if_snd, m);
sc->sc_tx_mbufs[slot] = NULL;
ifq_set_oactive(&ifp->if_snd);
break;
}
ifq_deq_commit(&ifp->if_snd, m);
bus_dmamap_sync(vsc->sc_dmat, sc->sc_tx_dmamaps[slot], 0,
sc->sc_tx_dmamaps[slot]->dm_mapsize, BUS_DMASYNC_PREWRITE);
VIO_DMAMEM_SYNC(vsc, sc, hdr, sc->sc_hdr_size,
BUS_DMASYNC_PREWRITE);
VIO_DMAMEM_ENQUEUE(sc, vq, slot, hdr, sc->sc_hdr_size, 1);
virtio_enqueue(vq, slot, sc->sc_tx_dmamaps[slot], 1);
virtio_enqueue_commit(vsc, vq, slot, 0);
queued++;
#if NBPFILTER > 0
if (ifp->if_bpf)
bpf_mtap(ifp->if_bpf, m, BPF_DIRECTION_OUT);
#endif
}
if (ifq_is_oactive(&ifp->if_snd)) {
int r;
if (virtio_has_feature(vsc, VIRTIO_F_RING_EVENT_IDX))
r = virtio_postpone_intr_smart(&sc->sc_vq[VQTX]);
else
r = virtio_start_vq_intr(vsc, &sc->sc_vq[VQTX]);
if (r) {
vio_txeof(vq);
goto again;
}
}
if (queued > 0) {
virtio_notify(vsc, vq);
timeout_add_sec(&sc->sc_txtick, 1);
}
}
#if VIRTIO_DEBUG
void
vio_dump(struct vio_softc *sc)
{
struct ifnet *ifp = &sc->sc_ac.ac_if;
struct virtio_softc *vsc = sc->sc_virtio;
printf("%s status dump:\n", ifp->if_xname);
printf("TX virtqueue:\n");
virtio_vq_dump(&vsc->sc_vqs[VQTX]);
printf("tx tick active: %d\n", !timeout_triggered(&sc->sc_txtick));
printf("rx tick active: %d\n", !timeout_triggered(&sc->sc_rxtick));
printf("RX virtqueue:\n");
virtio_vq_dump(&vsc->sc_vqs[VQRX]);
if (vsc->sc_nvqs == 3) {
printf("CTL virtqueue:\n");
virtio_vq_dump(&vsc->sc_vqs[VQCTL]);
printf("ctrl_inuse: %d\n", sc->sc_ctrl_inuse);
}
}
#endif
int
vio_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
struct vio_softc *sc = ifp->if_softc;
struct ifreq *ifr = (struct ifreq *)data;
int s, r = 0;
s = splnet();
switch (cmd) {
case SIOCSIFADDR:
ifp->if_flags |= IFF_UP;
if (!(ifp->if_flags & IFF_RUNNING))
vio_init(ifp);
break;
case SIOCSIFFLAGS:
if (ifp->if_flags & IFF_UP) {
#if VIRTIO_DEBUG
if (ifp->if_flags & IFF_DEBUG)
vio_dump(sc);
#endif
if (ifp->if_flags & IFF_RUNNING)
r = ENETRESET;
else
vio_init(ifp);
} else {
if (ifp->if_flags & IFF_RUNNING)
vio_stop(ifp, 1);
}
break;
case SIOCGIFMEDIA:
case SIOCSIFMEDIA:
r = ifmedia_ioctl(ifp, ifr, &sc->sc_media, cmd);
break;
case SIOCGIFRXR:
r = if_rxr_ioctl((struct if_rxrinfo *)ifr->ifr_data,
NULL, MCLBYTES, &sc->sc_rx_ring);
break;
default:
r = ether_ioctl(ifp, &sc->sc_ac, cmd, data);
}
if (r == ENETRESET) {
if (ifp->if_flags & IFF_RUNNING)
vio_iff(sc);
r = 0;
}
splx(s);
return r;
}
/*
* Recieve implementation
*/
/* allocate and initialize a mbuf for receive */
int
vio_add_rx_mbuf(struct vio_softc *sc, int i)
{
struct mbuf *m;
int r;
m = MCLGETI(NULL, M_DONTWAIT, NULL, MCLBYTES);
if (m == NULL)
return ENOBUFS;
sc->sc_rx_mbufs[i] = m;
m->m_len = m->m_pkthdr.len = m->m_ext.ext_size;
r = bus_dmamap_load_mbuf(sc->sc_virtio->sc_dmat, sc->sc_rx_dmamaps[i],
m, BUS_DMA_READ|BUS_DMA_NOWAIT);
if (r) {
m_freem(m);
sc->sc_rx_mbufs[i] = 0;
return r;
}
return 0;
}
/* free a mbuf for receive */
void
vio_free_rx_mbuf(struct vio_softc *sc, int i)
{
bus_dmamap_unload(sc->sc_virtio->sc_dmat, sc->sc_rx_dmamaps[i]);
m_freem(sc->sc_rx_mbufs[i]);
sc->sc_rx_mbufs[i] = NULL;
}
/* add mbufs for all the empty receive slots */
void
vio_populate_rx_mbufs(struct vio_softc *sc)
{
struct virtio_softc *vsc = sc->sc_virtio;
int r, done = 0;
u_int slots;
struct virtqueue *vq = &sc->sc_vq[VQRX];
int mrg_rxbuf = VIO_HAVE_MRG_RXBUF(sc);
for (slots = if_rxr_get(&sc->sc_rx_ring, vq->vq_num);
slots > 0; slots--) {
int slot;
r = virtio_enqueue_prep(vq, &slot);
if (r == EAGAIN)
break;
if (r != 0)
panic("enqueue_prep for rx buffers: %d", r);
if (sc->sc_rx_mbufs[slot] == NULL) {
r = vio_add_rx_mbuf(sc, slot);
if (r != 0) {
virtio_enqueue_abort(vq, slot);
break;
}
}
r = virtio_enqueue_reserve(vq, slot,
sc->sc_rx_dmamaps[slot]->dm_nsegs + (mrg_rxbuf ? 0 : 1));
if (r != 0) {
vio_free_rx_mbuf(sc, slot);
break;
}
bus_dmamap_sync(vsc->sc_dmat, sc->sc_rx_dmamaps[slot], 0,
MCLBYTES, BUS_DMASYNC_PREREAD);
if (mrg_rxbuf) {
virtio_enqueue(vq, slot, sc->sc_rx_dmamaps[slot], 0);
} else {
/*
* Buggy kvm wants a buffer of exactly the size of
* the header in this case, so we have to split in
* two.
*/
virtio_enqueue_p(vq, slot, sc->sc_rx_dmamaps[slot],
0, sc->sc_hdr_size, 0);
virtio_enqueue_p(vq, slot, sc->sc_rx_dmamaps[slot],
sc->sc_hdr_size, MCLBYTES - sc->sc_hdr_size, 0);
}
virtio_enqueue_commit(vsc, vq, slot, 0);
done = 1;
}
if_rxr_put(&sc->sc_rx_ring, slots);
if (done)
virtio_notify(vsc, vq);
timeout_add_sec(&sc->sc_rxtick, 1);
}
/* dequeue received packets */
int
vio_rxeof(struct vio_softc *sc)
{
struct virtio_softc *vsc = sc->sc_virtio;
struct virtqueue *vq = &sc->sc_vq[VQRX];
struct ifnet *ifp = &sc->sc_ac.ac_if;
struct mbuf_list ml = MBUF_LIST_INITIALIZER();
struct mbuf *m, *m0 = NULL, *mlast;
int r = 0;
int slot, len, bufs_left;
struct virtio_net_hdr *hdr;