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|
/* $OpenBSD: if_xnf.c,v 1.58 2017/07/14 18:24:51 mikeb Exp $ */
/*
* Copyright (c) 2015, 2016 Mike Belopuhov
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "bpfilter.h"
#include "vlan.h"
#include "xen.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/atomic.h>
#include <sys/device.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/pool.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/task.h>
#include <sys/timeout.h>
#include <machine/bus.h>
#include <dev/pv/xenreg.h>
#include <dev/pv/xenvar.h>
#include <net/if.h>
#include <net/if_media.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#ifdef INET6
#include <netinet/ip6.h>
#endif
#if NBPFILTER > 0
#include <net/bpf.h>
#endif
/* #define XNF_DEBUG */
#ifdef XNF_DEBUG
#define DPRINTF(x...) printf(x)
#else
#define DPRINTF(x...)
#endif
/*
* Rx ring
*/
struct xnf_rx_req {
uint16_t rxq_id;
uint16_t rxq_pad;
uint32_t rxq_ref;
} __packed;
struct xnf_rx_rsp {
uint16_t rxp_id;
uint16_t rxp_offset;
uint16_t rxp_flags;
#define XNF_RXF_CSUM_VALID 0x0001
#define XNF_RXF_CSUM_BLANK 0x0002
#define XNF_RXF_CHUNK 0x0004
#define XNF_RXF_MGMT 0x0008
int16_t rxp_status;
} __packed;
union xnf_rx_desc {
struct xnf_rx_req rxd_req;
struct xnf_rx_rsp rxd_rsp;
} __packed;
#define XNF_RX_DESC 256
#define XNF_MCLEN PAGE_SIZE
#define XNF_RX_MIN 32
struct xnf_rx_ring {
volatile uint32_t rxr_prod;
volatile uint32_t rxr_prod_event;
volatile uint32_t rxr_cons;
volatile uint32_t rxr_cons_event;
uint32_t rxr_reserved[12];
union xnf_rx_desc rxr_desc[XNF_RX_DESC];
} __packed;
/*
* Tx ring
*/
struct xnf_tx_req {
uint32_t txq_ref;
uint16_t txq_offset;
uint16_t txq_flags;
#define XNF_TXF_CSUM_BLANK 0x0001
#define XNF_TXF_CSUM_VALID 0x0002
#define XNF_TXF_CHUNK 0x0004
#define XNF_TXF_ETXRA 0x0008
uint16_t txq_id;
uint16_t txq_size;
} __packed;
struct xnf_tx_rsp {
uint16_t txp_id;
int16_t txp_status;
} __packed;
union xnf_tx_desc {
struct xnf_tx_req txd_req;
struct xnf_tx_rsp txd_rsp;
} __packed;
#define XNF_TX_DESC 256
#define XNF_TX_FRAG 18
struct xnf_tx_ring {
volatile uint32_t txr_prod;
volatile uint32_t txr_prod_event;
volatile uint32_t txr_cons;
volatile uint32_t txr_cons_event;
uint32_t txr_reserved[12];
union xnf_tx_desc txr_desc[XNF_TX_DESC];
} __packed;
/* Management frame, "extra info" in Xen parlance */
struct xnf_mgmt {
uint8_t mg_type;
#define XNF_MGMT_MCAST_ADD 2
#define XNF_MGMT_MCAST_DEL 3
uint8_t mg_flags;
union {
uint8_t mgu_mcaddr[ETHER_ADDR_LEN];
uint16_t mgu_pad[3];
} u;
#define mg_mcaddr u.mgu_mcaddr
} __packed;
struct xnf_softc {
struct device sc_dev;
struct device *sc_parent;
char sc_node[XEN_MAX_NODE_LEN];
char sc_backend[XEN_MAX_BACKEND_LEN];
bus_dma_tag_t sc_dmat;
int sc_domid;
struct arpcom sc_ac;
struct ifmedia sc_media;
xen_intr_handle_t sc_xih;
int sc_caps;
#define XNF_CAP_SG 0x0001
#define XNF_CAP_CSUM4 0x0002
#define XNF_CAP_CSUM6 0x0004
#define XNF_CAP_MCAST 0x0008
#define XNF_CAP_SPLIT 0x0010
#define XNF_CAP_MULTIQ 0x0020
/* Rx ring */
struct xnf_rx_ring *sc_rx_ring;
bus_dmamap_t sc_rx_rmap; /* map for the ring */
bus_dma_segment_t sc_rx_seg;
uint32_t sc_rx_ref; /* grant table ref */
uint32_t sc_rx_cons;
struct mbuf *sc_rx_buf[XNF_RX_DESC];
bus_dmamap_t sc_rx_dmap[XNF_RX_DESC]; /* maps for packets */
struct mbuf *sc_rx_cbuf[2]; /* chain handling */
/* Tx ring */
struct xnf_tx_ring *sc_tx_ring;
bus_dmamap_t sc_tx_rmap; /* map for the ring */
bus_dma_segment_t sc_tx_seg;
uint32_t sc_tx_ref; /* grant table ref */
uint32_t sc_tx_cons;
int sc_tx_frags;
struct mbuf *sc_tx_buf[XNF_TX_DESC];
bus_dmamap_t sc_tx_dmap[XNF_TX_DESC]; /* maps for packets */
};
int xnf_match(struct device *, void *, void *);
void xnf_attach(struct device *, struct device *, void *);
int xnf_detach(struct device *, int);
int xnf_lladdr(struct xnf_softc *);
int xnf_ioctl(struct ifnet *, u_long, caddr_t);
int xnf_media_change(struct ifnet *);
void xnf_media_status(struct ifnet *, struct ifmediareq *);
int xnf_iff(struct xnf_softc *);
void xnf_init(struct xnf_softc *);
void xnf_stop(struct xnf_softc *);
void xnf_start(struct ifqueue *);
int xnf_encap(struct xnf_softc *, struct mbuf *, uint32_t *);
void xnf_intr(void *);
void xnf_watchdog(struct ifnet *);
void xnf_txeof(struct xnf_softc *);
void xnf_rxeof(struct xnf_softc *);
int xnf_rx_ring_fill(struct xnf_softc *);
int xnf_rx_ring_create(struct xnf_softc *);
void xnf_rx_ring_drain(struct xnf_softc *);
void xnf_rx_ring_destroy(struct xnf_softc *);
int xnf_tx_ring_create(struct xnf_softc *);
void xnf_tx_ring_drain(struct xnf_softc *);
void xnf_tx_ring_destroy(struct xnf_softc *);
int xnf_capabilities(struct xnf_softc *sc);
int xnf_init_backend(struct xnf_softc *);
struct cfdriver xnf_cd = {
NULL, "xnf", DV_IFNET
};
const struct cfattach xnf_ca = {
sizeof(struct xnf_softc), xnf_match, xnf_attach, xnf_detach
};
int
xnf_match(struct device *parent, void *match, void *aux)
{
struct xen_attach_args *xa = aux;
if (strcmp("vif", xa->xa_name))
return (0);
return (1);
}
void
xnf_attach(struct device *parent, struct device *self, void *aux)
{
struct xen_attach_args *xa = aux;
struct xnf_softc *sc = (struct xnf_softc *)self;
struct ifnet *ifp = &sc->sc_ac.ac_if;
sc->sc_parent = parent;
sc->sc_dmat = xa->xa_dmat;
sc->sc_domid = xa->xa_domid;
memcpy(sc->sc_node, xa->xa_node, XEN_MAX_NODE_LEN);
memcpy(sc->sc_backend, xa->xa_backend, XEN_MAX_BACKEND_LEN);
strlcpy(ifp->if_xname, sc->sc_dev.dv_xname, IFNAMSIZ);
if (xnf_lladdr(sc)) {
printf(": failed to obtain MAC address\n");
return;
}
if (xen_intr_establish(0, &sc->sc_xih, sc->sc_domid, xnf_intr, sc,
ifp->if_xname)) {
printf(": failed to establish an interrupt\n");
return;
}
xen_intr_mask(sc->sc_xih);
printf(" backend %d channel %u: address %s\n", sc->sc_domid,
sc->sc_xih, ether_sprintf(sc->sc_ac.ac_enaddr));
if (xnf_capabilities(sc)) {
xen_intr_disestablish(sc->sc_xih);
return;
}
if (sc->sc_caps & XNF_CAP_SG)
ifp->if_hardmtu = 9000;
if (xnf_rx_ring_create(sc)) {
xen_intr_disestablish(sc->sc_xih);
return;
}
if (xnf_tx_ring_create(sc)) {
xen_intr_disestablish(sc->sc_xih);
xnf_rx_ring_destroy(sc);
return;
}
if (xnf_init_backend(sc)) {
xen_intr_disestablish(sc->sc_xih);
xnf_rx_ring_destroy(sc);
xnf_tx_ring_destroy(sc);
return;
}
ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
ifp->if_xflags = IFXF_MPSAFE;
ifp->if_ioctl = xnf_ioctl;
ifp->if_qstart = xnf_start;
ifp->if_watchdog = xnf_watchdog;
ifp->if_softc = sc;
ifp->if_capabilities = IFCAP_VLAN_MTU;
if (sc->sc_caps & XNF_CAP_CSUM4)
ifp->if_capabilities |= IFCAP_CSUM_TCPv4 | IFCAP_CSUM_UDPv4;
if (sc->sc_caps & XNF_CAP_CSUM6)
ifp->if_capabilities |= IFCAP_CSUM_TCPv6 | IFCAP_CSUM_UDPv6;
IFQ_SET_MAXLEN(&ifp->if_snd, XNF_TX_DESC - 1);
ifmedia_init(&sc->sc_media, IFM_IMASK, xnf_media_change,
xnf_media_status);
ifmedia_add(&sc->sc_media, IFM_ETHER | IFM_MANUAL, 0, NULL);
ifmedia_set(&sc->sc_media, IFM_ETHER | IFM_MANUAL);
if_attach(ifp);
ether_ifattach(ifp);
/* Kick out emulated em's and re's */
xen_unplug_emulated(parent, XEN_UNPLUG_NIC);
}
int
xnf_detach(struct device *self, int flags)
{
struct xnf_softc *sc = (struct xnf_softc *)self;
struct ifnet *ifp = &sc->sc_ac.ac_if;
xnf_stop(sc);
ether_ifdetach(ifp);
if_detach(ifp);
xen_intr_disestablish(sc->sc_xih);
if (sc->sc_tx_ring)
xnf_tx_ring_destroy(sc);
if (sc->sc_rx_ring)
xnf_rx_ring_destroy(sc);
return (0);
}
static int
nibble(int ch)
{
if (ch >= '0' && ch <= '9')
return (ch - '0');
if (ch >= 'A' && ch <= 'F')
return (10 + ch - 'A');
if (ch >= 'a' && ch <= 'f')
return (10 + ch - 'a');
return (-1);
}
int
xnf_lladdr(struct xnf_softc *sc)
{
char enaddr[ETHER_ADDR_LEN];
char mac[32];
int i, j, lo, hi;
if (xs_getprop(sc->sc_parent, sc->sc_backend, "mac", mac, sizeof(mac)))
return (-1);
for (i = 0, j = 0; j < ETHER_ADDR_LEN; i += 3, j++) {
if ((hi = nibble(mac[i])) == -1 ||
(lo = nibble(mac[i+1])) == -1)
return (-1);
enaddr[j] = hi << 4 | lo;
}
memcpy(sc->sc_ac.ac_enaddr, enaddr, ETHER_ADDR_LEN);
return (0);
}
int
xnf_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
{
struct xnf_softc *sc = ifp->if_softc;
struct ifreq *ifr = (struct ifreq *)data;
int s, error = 0;
s = splnet();
switch (command) {
case SIOCSIFADDR:
ifp->if_flags |= IFF_UP;
if (!(ifp->if_flags & IFF_RUNNING))
xnf_init(sc);
break;
case SIOCSIFFLAGS:
if (ifp->if_flags & IFF_UP) {
if (ifp->if_flags & IFF_RUNNING)
error = ENETRESET;
else
xnf_init(sc);
} else {
if (ifp->if_flags & IFF_RUNNING)
xnf_stop(sc);
}
break;
case SIOCGIFMEDIA:
case SIOCSIFMEDIA:
error = ifmedia_ioctl(ifp, ifr, &sc->sc_media, command);
break;
default:
error = ether_ioctl(ifp, &sc->sc_ac, command, data);
break;
}
if (error == ENETRESET) {
if (ifp->if_flags & IFF_RUNNING)
xnf_iff(sc);
error = 0;
}
splx(s);
return (error);
}
int
xnf_media_change(struct ifnet *ifp)
{
return (0);
}
void
xnf_media_status(struct ifnet *ifp, struct ifmediareq *ifmr)
{
ifmr->ifm_status = IFM_ACTIVE | IFM_AVALID;
ifmr->ifm_active = IFM_ETHER | IFM_MANUAL;
}
int
xnf_iff(struct xnf_softc *sc)
{
return (0);
}
void
xnf_init(struct xnf_softc *sc)
{
struct ifnet *ifp = &sc->sc_ac.ac_if;
xnf_stop(sc);
xnf_iff(sc);
xnf_rx_ring_fill(sc);
if (xen_intr_unmask(sc->sc_xih)) {
printf("%s: failed to enable interrupts\n", ifp->if_xname);
xnf_stop(sc);
return;
}
ifp->if_flags |= IFF_RUNNING;
ifq_clr_oactive(&ifp->if_snd);
}
void
xnf_stop(struct xnf_softc *sc)
{
struct ifnet *ifp = &sc->sc_ac.ac_if;
ifp->if_flags &= ~IFF_RUNNING;
xen_intr_mask(sc->sc_xih);
ifp->if_timer = 0;
ifq_barrier(&ifp->if_snd);
xen_intr_barrier(sc->sc_xih);
ifq_clr_oactive(&ifp->if_snd);
if (sc->sc_tx_ring)
xnf_tx_ring_drain(sc);
if (sc->sc_rx_ring)
xnf_rx_ring_drain(sc);
}
void
xnf_start(struct ifqueue *ifq)
{
struct ifnet *ifp = ifq->ifq_if;
struct xnf_softc *sc = ifp->if_softc;
struct xnf_tx_ring *txr = sc->sc_tx_ring;
struct mbuf *m;
int pkts = 0;
uint32_t prod, oprod;
bus_dmamap_sync(sc->sc_dmat, sc->sc_tx_rmap, 0, 0,
BUS_DMASYNC_POSTREAD);
prod = oprod = txr->txr_prod;
for (;;) {
if ((XNF_TX_DESC - (prod - sc->sc_tx_cons)) <
sc->sc_tx_frags) {
/* transient */
ifq_set_oactive(ifq);
break;
}
m = ifq_dequeue(ifq);
if (m == NULL)
break;
if (xnf_encap(sc, m, &prod)) {
/* the chain is too large */
ifp->if_oerrors++;
m_freem(m);
continue;
}
#if NBPFILTER > 0
if (ifp->if_bpf)
bpf_mtap_ether(ifp->if_bpf, m, BPF_DIRECTION_OUT);
#endif
pkts++;
}
if (pkts > 0) {
txr->txr_prod = prod;
if (txr->txr_cons_event <= txr->txr_cons)
txr->txr_cons_event = txr->txr_cons +
((txr->txr_prod - txr->txr_cons) >> 1) + 1;
bus_dmamap_sync(sc->sc_dmat, sc->sc_tx_rmap, 0, 0,
BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
if (prod - txr->txr_prod_event < prod - oprod)
xen_intr_signal(sc->sc_xih);
ifp->if_timer = 5;
}
}
static inline int
xnf_fragcount(struct mbuf *m_head)
{
struct mbuf *m;
vaddr_t va, va0;
int n = 0;
for (m = m_head; m != NULL; m = m->m_next) {
if (m->m_len == 0)
continue;
/* start of the buffer */
for (va0 = va = mtod(m, vaddr_t);
/* does the buffer end on this page? */
va + (PAGE_SIZE - (va & PAGE_MASK)) < va0 + m->m_len;
/* move on to the next page */
va += PAGE_SIZE - (va & PAGE_MASK))
n++;
n++;
}
return (n);
}
int
xnf_encap(struct xnf_softc *sc, struct mbuf *m_head, uint32_t *prod)
{
struct ifnet *ifp = &sc->sc_ac.ac_if;
struct xnf_tx_ring *txr = sc->sc_tx_ring;
union xnf_tx_desc *txd = NULL;
struct mbuf *m;
bus_dmamap_t dmap;
uint32_t oprod = *prod;
uint16_t id;
int i, flags, n;
if ((xnf_fragcount(m_head) > sc->sc_tx_frags) &&
m_defrag(m_head, M_DONTWAIT))
goto errout;
flags = (sc->sc_domid << 16) | BUS_DMA_WRITE | BUS_DMA_NOWAIT;
for (m = m_head; m != NULL && m->m_len > 0; m = m->m_next) {
i = *prod & (XNF_TX_DESC - 1);
txd = &txr->txr_desc[i];
id = txd->txd_req.txq_id;
if (sc->sc_tx_buf[id])
panic("%s: buf %u @%u cons %u(%u) prod %u next %u "
"seg %d/%d\n", ifp->if_xname, id, i, txr->txr_cons,
sc->sc_tx_cons, txr->txr_prod, *prod, *prod - oprod,
xnf_fragcount(m_head));
dmap = sc->sc_tx_dmap[id];
if (bus_dmamap_load(sc->sc_dmat, dmap, m->m_data, m->m_len,
NULL, flags)) {
DPRINTF("%s: failed to load %u bytes @%lu\n",
sc->sc_dev.dv_xname, m->m_len,
mtod(m, vaddr_t) & PAGE_MASK);
goto unroll;
}
if (m == m_head) {
if (m->m_pkthdr.csum_flags &
(M_TCP_CSUM_OUT | M_UDP_CSUM_OUT))
txd->txd_req.txq_flags = XNF_TXF_CSUM_BLANK |
XNF_TXF_CSUM_VALID;
txd->txd_req.txq_size = m->m_pkthdr.len;
}
for (n = 0; n < dmap->dm_nsegs; n++) {
i = *prod & (XNF_TX_DESC - 1);
txd = &txr->txr_desc[i];
id = txd->txd_req.txq_id;
if (sc->sc_tx_buf[id])
panic("%s: buf %u @%u cons %u(%u) prod %u "
"next %u seg %d/%d\n", ifp->if_xname,
id, i, txr->txr_cons, sc->sc_tx_cons,
txr->txr_prod, *prod, *prod - oprod,
xnf_fragcount(m_head));
/* Don't overwrite lenght of the very first one */
if (!(m == m_head && n == 0))
txd->txd_req.txq_size = dmap->dm_segs[n].ds_len;
/* The chunk flag will be removed from the last one */
txd->txd_req.txq_flags |= XNF_TXF_CHUNK;
txd->txd_req.txq_ref = dmap->dm_segs[n].ds_addr;
if (n == 0)
txd->txd_req.txq_offset =
mtod(m, vaddr_t) & PAGE_MASK;
(*prod)++;
}
sc->sc_tx_buf[id] = m;
}
/* Clear the chunk flag from the last segment */
txd->txd_req.txq_flags &= ~XNF_TXF_CHUNK;
bus_dmamap_sync(sc->sc_dmat, sc->sc_tx_rmap, 0, 0,
BUS_DMASYNC_PREWRITE);
return (0);
unroll:
for (; *prod != oprod; (*prod)--) {
i = (*prod - 1) & (XNF_TX_DESC - 1);
txd = &txr->txr_desc[i];
id = txd->txd_req.txq_id;
memset(txd, 0, sizeof(*txd));
txd->txd_req.txq_id = id;
dmap = sc->sc_tx_dmap[id];
bus_dmamap_sync(sc->sc_dmat, dmap, 0, 0,
BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
bus_dmamap_unload(sc->sc_dmat, dmap);
sc->sc_tx_buf[id] = NULL;
}
errout:
return (ENOBUFS);
}
void
xnf_intr(void *arg)
{
struct xnf_softc *sc = arg;
struct ifnet *ifp = &sc->sc_ac.ac_if;
if (ifp->if_flags & IFF_RUNNING) {
xnf_txeof(sc);
xnf_rxeof(sc);
}
}
void
xnf_watchdog(struct ifnet *ifp)
{
struct xnf_softc *sc = ifp->if_softc;
struct xnf_tx_ring *txr = sc->sc_tx_ring;
printf("%s: tx stuck: prod %u cons %u,%u evt %u,%u\n",
ifp->if_xname, txr->txr_prod, txr->txr_cons, sc->sc_tx_cons,
txr->txr_prod_event, txr->txr_cons_event);
}
void
xnf_txeof(struct xnf_softc *sc)
{
struct ifnet *ifp = &sc->sc_ac.ac_if;
struct xnf_tx_ring *txr = sc->sc_tx_ring;
union xnf_tx_desc *txd;
bus_dmamap_t dmap;
uint32_t cons;
uint16_t id;
int i;
bus_dmamap_sync(sc->sc_dmat, sc->sc_tx_rmap, 0, 0,
BUS_DMASYNC_POSTWRITE);
for (cons = sc->sc_tx_cons; cons != txr->txr_cons; cons++) {
i = cons & (XNF_TX_DESC - 1);
txd = &txr->txr_desc[i];
id = txd->txd_rsp.txp_id;
dmap = sc->sc_tx_dmap[id];
bus_dmamap_sync(sc->sc_dmat, dmap, 0, 0,
BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
bus_dmamap_unload(sc->sc_dmat, dmap);
if (sc->sc_tx_buf[id] != NULL) {
m_free(sc->sc_tx_buf[id]);
sc->sc_tx_buf[id] = NULL;
}
memset(txd, 0, sizeof(*txd));
txd->txd_req.txq_id = id;
}
sc->sc_tx_cons = cons;
txr->txr_cons_event = sc->sc_tx_cons +
((txr->txr_prod - sc->sc_tx_cons) >> 1) + 1;
bus_dmamap_sync(sc->sc_dmat, sc->sc_tx_rmap, 0, 0,
BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
if (txr->txr_cons == txr->txr_prod)
ifp->if_timer = 0;
if (ifq_is_oactive(&ifp->if_snd))
ifq_restart(&ifp->if_snd);
}
void
xnf_rxeof(struct xnf_softc *sc)
{
struct ifnet *ifp = &sc->sc_ac.ac_if;
struct xnf_rx_ring *rxr = sc->sc_rx_ring;
union xnf_rx_desc *rxd;
struct mbuf_list ml = MBUF_LIST_INITIALIZER();
struct mbuf *fmp = sc->sc_rx_cbuf[0];
struct mbuf *lmp = sc->sc_rx_cbuf[1];
struct mbuf *m;
bus_dmamap_t dmap;
uint32_t cons;
uint16_t id;
int i, flags, len, offset;
bus_dmamap_sync(sc->sc_dmat, sc->sc_rx_rmap, 0, 0,
BUS_DMASYNC_POSTREAD);
for (cons = sc->sc_rx_cons; cons != rxr->rxr_cons; cons++) {
i = cons & (XNF_RX_DESC - 1);
rxd = &rxr->rxr_desc[i];
id = rxd->rxd_rsp.rxp_id;
len = rxd->rxd_rsp.rxp_status;
flags = rxd->rxd_rsp.rxp_flags;
offset = rxd->rxd_rsp.rxp_offset;
dmap = sc->sc_rx_dmap[id];
bus_dmamap_sync(sc->sc_dmat, dmap, 0, 0,
BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
bus_dmamap_unload(sc->sc_dmat, dmap);
m = sc->sc_rx_buf[id];
KASSERT(m != NULL);
sc->sc_rx_buf[id] = NULL;
if (flags & XNF_RXF_MGMT) {
printf("%s: management data present\n",
ifp->if_xname);
m_freem(m);
continue;
}
if (flags & XNF_RXF_CSUM_VALID)
m->m_pkthdr.csum_flags = M_TCP_CSUM_IN_OK |
M_UDP_CSUM_IN_OK;
if (len < 0 || (len + offset > PAGE_SIZE)) {
ifp->if_ierrors++;
m_freem(m);
continue;
}
m->m_len = len;
m->m_data += offset;
if (fmp == NULL) {
m->m_pkthdr.len = len;
fmp = m;
} else {
m->m_flags &= ~M_PKTHDR;
lmp->m_next = m;
fmp->m_pkthdr.len += m->m_len;
}
lmp = m;
if (flags & XNF_RXF_CHUNK) {
sc->sc_rx_cbuf[0] = fmp;
sc->sc_rx_cbuf[1] = lmp;
continue;
}
m = fmp;
ml_enqueue(&ml, m);
sc->sc_rx_cbuf[0] = sc->sc_rx_cbuf[1] = fmp = lmp = NULL;
memset(rxd, 0, sizeof(*rxd));
rxd->rxd_req.rxq_id = id;
}
sc->sc_rx_cons = cons;
rxr->rxr_cons_event = sc->sc_rx_cons + 1;
bus_dmamap_sync(sc->sc_dmat, sc->sc_rx_rmap, 0, 0,
BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
if_input(ifp, &ml);
if (xnf_rx_ring_fill(sc) || (sc->sc_rx_cons != rxr->rxr_cons))
xen_intr_schedule(sc->sc_xih);
}
int
xnf_rx_ring_fill(struct xnf_softc *sc)
{
struct ifnet *ifp = &sc->sc_ac.ac_if;
struct xnf_rx_ring *rxr = sc->sc_rx_ring;
union xnf_rx_desc *rxd;
bus_dmamap_t dmap;
struct mbuf *m;
uint32_t cons, prod, oprod;
uint16_t id;
int i, flags, resched = 0;
cons = rxr->rxr_cons;
prod = oprod = rxr->rxr_prod;
while (prod - cons < XNF_RX_DESC) {
i = prod & (XNF_RX_DESC - 1);
rxd = &rxr->rxr_desc[i];
id = rxd->rxd_rsp.rxp_id;
if (sc->sc_rx_buf[id])
break;
m = MCLGETI(NULL, M_DONTWAIT, NULL, XNF_MCLEN);
if (m == NULL)
break;
m->m_len = m->m_pkthdr.len = XNF_MCLEN;
dmap = sc->sc_rx_dmap[id];
flags = (sc->sc_domid << 16) | BUS_DMA_READ | BUS_DMA_NOWAIT;
if (bus_dmamap_load_mbuf(sc->sc_dmat, dmap, m, flags)) {
m_freem(m);
break;
}
sc->sc_rx_buf[id] = m;
rxd->rxd_req.rxq_ref = dmap->dm_segs[0].ds_addr;
bus_dmamap_sync(sc->sc_dmat, dmap, 0, 0, BUS_DMASYNC_PREWRITE);
prod++;
}
rxr->rxr_prod = prod;
bus_dmamap_sync(sc->sc_dmat, sc->sc_rx_rmap, 0, 0,
BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
if ((prod - cons < XNF_RX_MIN) && (ifp->if_flags & IFF_RUNNING))
resched = 1;
if (prod - rxr->rxr_prod_event < prod - oprod)
xen_intr_signal(sc->sc_xih);
return (resched);
}
int
xnf_rx_ring_create(struct xnf_softc *sc)
{
int i, flags, rsegs;
/* Allocate a page of memory for the ring */
if (bus_dmamem_alloc(sc->sc_dmat, PAGE_SIZE, PAGE_SIZE, 0,
&sc->sc_rx_seg, 1, &rsegs, BUS_DMA_ZERO | BUS_DMA_NOWAIT)) {
printf("%s: failed to allocate memory for the rx ring\n",
sc->sc_dev.dv_xname);
return (-1);
}
/* Map in the allocated memory into the ring structure */
if (bus_dmamem_map(sc->sc_dmat, &sc->sc_rx_seg, 1, PAGE_SIZE,
(caddr_t *)(&sc->sc_rx_ring), BUS_DMA_NOWAIT)) {
printf("%s: failed to map memory for the rx ring\n",
sc->sc_dev.dv_xname);
goto errout;
}
/* Create a map to load the ring memory into */
if (bus_dmamap_create(sc->sc_dmat, PAGE_SIZE, 1, PAGE_SIZE, 0,
BUS_DMA_NOWAIT, &sc->sc_rx_rmap)) {
printf("%s: failed to create a memory map for the rx ring\n",
sc->sc_dev.dv_xname);
goto errout;
}
/* Load the ring into the ring map to extract the PA */
flags = (sc->sc_domid << 16) | BUS_DMA_NOWAIT;
if (bus_dmamap_load(sc->sc_dmat, sc->sc_rx_rmap, sc->sc_rx_ring,
PAGE_SIZE, NULL, flags)) {
printf("%s: failed to load the rx ring map\n",
sc->sc_dev.dv_xname);
goto errout;
}
sc->sc_rx_ref = sc->sc_rx_rmap->dm_segs[0].ds_addr;
sc->sc_rx_ring->rxr_prod_event = sc->sc_rx_ring->rxr_cons_event = 1;
for (i = 0; i < XNF_RX_DESC; i++) {
if (bus_dmamap_create(sc->sc_dmat, XNF_MCLEN, 1, XNF_MCLEN,
PAGE_SIZE, BUS_DMA_NOWAIT, &sc->sc_rx_dmap[i])) {
printf("%s: failed to create a memory map for the"
" rx slot %d\n", sc->sc_dev.dv_xname, i);
goto errout;
}
sc->sc_rx_ring->rxr_desc[i].rxd_req.rxq_id = i;
}
return (0);
errout:
xnf_rx_ring_destroy(sc);
return (-1);
}
void
xnf_rx_ring_drain(struct xnf_softc *sc)
{
struct xnf_rx_ring *rxr = sc->sc_rx_ring;
if (sc->sc_rx_cons != rxr->rxr_cons)
xnf_rxeof(sc);
}
void
xnf_rx_ring_destroy(struct xnf_softc *sc)
{
int i;
for (i = 0; i < XNF_RX_DESC; i++) {
if (sc->sc_rx_buf[i] == NULL)
continue;
bus_dmamap_sync(sc->sc_dmat, sc->sc_rx_dmap[i], 0, 0,
BUS_DMASYNC_POSTREAD);
bus_dmamap_unload(sc->sc_dmat, sc->sc_rx_dmap[i]);
m_freem(sc->sc_rx_buf[i]);
sc->sc_rx_buf[i] = NULL;
}
for (i = 0; i < XNF_RX_DESC; i++) {
if (sc->sc_rx_dmap[i] == NULL)
continue;
bus_dmamap_destroy(sc->sc_dmat, sc->sc_rx_dmap[i]);
sc->sc_rx_dmap[i] = NULL;
}
if (sc->sc_rx_rmap) {
bus_dmamap_sync(sc->sc_dmat, sc->sc_rx_rmap, 0, 0,
BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
bus_dmamap_unload(sc->sc_dmat, sc->sc_rx_rmap);
bus_dmamap_destroy(sc->sc_dmat, sc->sc_rx_rmap);
}
if (sc->sc_rx_ring) {
bus_dmamem_unmap(sc->sc_dmat, (caddr_t)sc->sc_rx_ring,
PAGE_SIZE);
bus_dmamem_free(sc->sc_dmat, &sc->sc_rx_seg, 1);
}
sc->sc_rx_ring = NULL;
sc->sc_rx_rmap = NULL;
sc->sc_rx_cons = 0;
}
int
xnf_tx_ring_create(struct xnf_softc *sc)
{
struct ifnet *ifp = &sc->sc_ac.ac_if;
int i, flags, nsegs, rsegs;
bus_size_t segsz;
sc->sc_tx_frags = sc->sc_caps & XNF_CAP_SG ? XNF_TX_FRAG : 1;
/* Allocate a page of memory for the ring */
if (bus_dmamem_alloc(sc->sc_dmat, PAGE_SIZE, PAGE_SIZE, 0,
&sc->sc_tx_seg, 1, &rsegs, BUS_DMA_ZERO | BUS_DMA_NOWAIT)) {
printf("%s: failed to allocate memory for the tx ring\n",
sc->sc_dev.dv_xname);
return (-1);
}
/* Map in the allocated memory into the ring structure */
if (bus_dmamem_map(sc->sc_dmat, &sc->sc_tx_seg, 1, PAGE_SIZE,
(caddr_t *)&sc->sc_tx_ring, BUS_DMA_NOWAIT)) {
printf("%s: failed to map memory for the tx ring\n",
sc->sc_dev.dv_xname);
goto errout;
}
/* Create a map to load the ring memory into */
if (bus_dmamap_create(sc->sc_dmat, PAGE_SIZE, 1, PAGE_SIZE, 0,
BUS_DMA_NOWAIT, &sc->sc_tx_rmap)) {
printf("%s: failed to create a memory map for the tx ring\n",
sc->sc_dev.dv_xname);
goto errout;
}
/* Load the ring into the ring map to extract the PA */
flags = (sc->sc_domid << 16) | BUS_DMA_NOWAIT;
if (bus_dmamap_load(sc->sc_dmat, sc->sc_tx_rmap, sc->sc_tx_ring,
PAGE_SIZE, NULL, flags)) {
printf("%s: failed to load the tx ring map\n",
sc->sc_dev.dv_xname);
goto errout;
}
sc->sc_tx_ref = sc->sc_tx_rmap->dm_segs[0].ds_addr;
sc->sc_tx_ring->txr_prod_event = sc->sc_tx_ring->txr_cons_event = 1;
if (sc->sc_caps & XNF_CAP_SG) {
nsegs = roundup(ifp->if_hardmtu, XNF_MCLEN) / XNF_MCLEN + 1;
segsz = nsegs * XNF_MCLEN;
} else {
nsegs = 1;
segsz = XNF_MCLEN;
}
for (i = 0; i < XNF_TX_DESC; i++) {
if (bus_dmamap_create(sc->sc_dmat, segsz, nsegs, XNF_MCLEN,
PAGE_SIZE, BUS_DMA_NOWAIT, &sc->sc_tx_dmap[i])) {
printf("%s: failed to create a memory map for the"
" tx slot %d\n", sc->sc_dev.dv_xname, i);
goto errout;
}
sc->sc_tx_ring->txr_desc[i].txd_req.txq_id = i;
}
return (0);
errout:
xnf_tx_ring_destroy(sc);
return (-1);
}
void
xnf_tx_ring_drain(struct xnf_softc *sc)
{
struct xnf_tx_ring *txr = sc->sc_tx_ring;
if (sc->sc_tx_cons != txr->txr_cons)
xnf_txeof(sc);
}
void
xnf_tx_ring_destroy(struct xnf_softc *sc)
{
int i;
for (i = 0; i < XNF_TX_DESC; i++) {
if (sc->sc_tx_dmap[i] == NULL)
continue;
bus_dmamap_sync(sc->sc_dmat, sc->sc_tx_dmap[i], 0, 0,
BUS_DMASYNC_POSTWRITE);
bus_dmamap_unload(sc->sc_dmat, sc->sc_tx_dmap[i]);
bus_dmamap_destroy(sc->sc_dmat, sc->sc_tx_dmap[i]);
sc->sc_tx_dmap[i] = NULL;
if (sc->sc_tx_buf[i] == NULL)
continue;
m_free(sc->sc_tx_buf[i]);
sc->sc_tx_buf[i] = NULL;
}
if (sc->sc_tx_rmap) {
bus_dmamap_sync(sc->sc_dmat, sc->sc_tx_rmap, 0, 0,
BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
bus_dmamap_unload(sc->sc_dmat, sc->sc_tx_rmap);
bus_dmamap_destroy(sc->sc_dmat, sc->sc_tx_rmap);
}
if (sc->sc_tx_ring) {
bus_dmamem_unmap(sc->sc_dmat, (caddr_t)sc->sc_tx_ring,
PAGE_SIZE);
bus_dmamem_free(sc->sc_dmat, &sc->sc_tx_seg, 1);
}
sc->sc_tx_ring = NULL;
sc->sc_tx_rmap = NULL;
}
int
xnf_capabilities(struct xnf_softc *sc)
{
unsigned long long res;
const char *prop;
char val[32];
int error;
/* Query scatter-gather capability */
prop = "feature-sg";
if ((error = xs_getnum(sc->sc_parent, sc->sc_backend, prop, &res)) != 0
&& error != ENOENT)
goto errout;
if (error == 0 && res == 1)
sc->sc_caps |= XNF_CAP_SG;
/* Query IPv4 checksum offloading capability, enabled by default */
sc->sc_caps |= XNF_CAP_CSUM4;
prop = "feature-no-csum-offload";
if ((error = xs_getnum(sc->sc_parent, sc->sc_backend, prop, &res)) != 0
&& error != ENOENT)
goto errout;
if (error == 0 && res == 1)
sc->sc_caps &= ~XNF_CAP_CSUM4;
/* Query IPv6 checksum offloading capability */
prop = "feature-ipv6-csum-offload";
if ((error = xs_getnum(sc->sc_parent, sc->sc_backend, prop, &res)) != 0
&& error != ENOENT)
goto errout;
if (error == 0 && res == 1)
sc->sc_caps |= XNF_CAP_CSUM6;
/* Query multicast traffic contol capability */
prop = "feature-multicast-control";
if ((error = xs_getnum(sc->sc_parent, sc->sc_backend, prop, &res)) != 0
&& error != ENOENT)
goto errout;
if (error == 0 && res == 1)
sc->sc_caps |= XNF_CAP_MCAST;
/* Query split Rx/Tx event channel capability */
prop = "feature-split-event-channels";
if ((error = xs_getnum(sc->sc_parent, sc->sc_backend, prop, &res)) != 0
&& error != ENOENT)
goto errout;
if (error == 0 && res == 1)
sc->sc_caps |= XNF_CAP_SPLIT;
/* Query multiqueue capability */
prop = "multi-queue-max-queues";
if ((error = xs_getprop(sc->sc_parent, sc->sc_backend, prop, val,
sizeof(val))) == 0)
if ((error = xs_getnum(sc->sc_parent, sc->sc_backend, prop, &res)) != 0
&& error != ENOENT)
goto errout;
if (error == 0)
sc->sc_caps |= XNF_CAP_MULTIQ;
DPRINTF("%s: capabilities %b\n", sc->sc_dev.dv_xname, sc->sc_caps,
"\20\006MULTIQ\005SPLIT\004MCAST\003CSUM6\002CSUM4\001SG");
return (0);
errout:
printf("%s: failed to read \"%s\" property\n", sc->sc_dev.dv_xname,
prop);
return (-1);
}
int
xnf_init_backend(struct xnf_softc *sc)
{
const char *prop;
/* Plumb the Rx ring */
prop = "rx-ring-ref";
if (xs_setnum(sc->sc_parent, sc->sc_node, prop, sc->sc_rx_ref))
goto errout;
/* Enable "copy" mode */
prop = "request-rx-copy";
if (xs_setnum(sc->sc_parent, sc->sc_node, prop, 1))
goto errout;
/* Enable notify mode */
prop = "feature-rx-notify";
if (xs_setnum(sc->sc_parent, sc->sc_node, prop, 1))
goto errout;
/* Plumb the Tx ring */
prop = "tx-ring-ref";
if (xs_setnum(sc->sc_parent, sc->sc_node, prop, sc->sc_tx_ref))
goto errout;
/* Enable scatter-gather mode */
if (sc->sc_tx_frags > 1) {
prop = "feature-sg";
if (xs_setnum(sc->sc_parent, sc->sc_node, prop, 1))
goto errout;
}
/* Enable IPv6 checksum offloading */
if (sc->sc_caps & XNF_CAP_CSUM6) {
prop = "feature-ipv6-csum-offload";
if (xs_setnum(sc->sc_parent, sc->sc_node, prop, 1))
goto errout;
}
/* Plumb the event channel port */
prop = "event-channel";
if (xs_setnum(sc->sc_parent, sc->sc_node, prop, sc->sc_xih))
goto errout;
/* Connect the device */
prop = "state";
if (xs_setprop(sc->sc_parent, sc->sc_node, prop, XEN_STATE_CONNECTED,
strlen(XEN_STATE_CONNECTED)))
goto errout;
return (0);
errout:
printf("%s: failed to set \"%s\" property\n", sc->sc_dev.dv_xname, prop);
return (-1);
}
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