[mirror_qemu.git] / hw / xen_nic.c

/*
 *  xen paravirt network card backend
 *
 *  (c) Gerd Hoffmann <kraxel@redhat.com>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; under version 2 of the License.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, see <http://www.gnu.org/licenses/>.
 *
 *  Contributions after 2012-01-13 are licensed under the terms of the
 *  GNU GPL, version 2 or (at your option) any later version.
 */

#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>
#include <inttypes.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <sys/wait.h>

#include "hw.h"
#include "net/net.h"
#include "net/checksum.h"
#include "net/util.h"
#include "xen_backend.h"

#include <xen/io/netif.h>

/* ------------------------------------------------------------- */

struct XenNetDev {
    struct XenDevice      xendev;  /* must be first */
    char                  *mac;
    int                   tx_work;
    int                   tx_ring_ref;
    int                   rx_ring_ref;
    struct netif_tx_sring *txs;
    struct netif_rx_sring *rxs;
    netif_tx_back_ring_t  tx_ring;
    netif_rx_back_ring_t  rx_ring;
    NICConf               conf;
    NICState              *nic;
};

/* ------------------------------------------------------------- */

static void net_tx_response(struct XenNetDev *netdev, netif_tx_request_t *txp, int8_t st)
{
    RING_IDX i = netdev->tx_ring.rsp_prod_pvt;
    netif_tx_response_t *resp;
    int notify;

    resp = RING_GET_RESPONSE(&netdev->tx_ring, i);
    resp->id     = txp->id;
    resp->status = st;

#if 0
    if (txp->flags & NETTXF_extra_info) {
        RING_GET_RESPONSE(&netdev->tx_ring, ++i)->status = NETIF_RSP_NULL;
    }
#endif

    netdev->tx_ring.rsp_prod_pvt = ++i;
    RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&netdev->tx_ring, notify);
    if (notify) {
        xen_be_send_notify(&netdev->xendev);
    }

    if (i == netdev->tx_ring.req_cons) {
        int more_to_do;
        RING_FINAL_CHECK_FOR_REQUESTS(&netdev->tx_ring, more_to_do);
        if (more_to_do) {
            netdev->tx_work++;
        }
    }
}

static void net_tx_error(struct XenNetDev *netdev, netif_tx_request_t *txp, RING_IDX end)
{
#if 0
    /*
     * Hmm, why netback fails everything in the ring?
     * Should we do that even when not supporting SG and TSO?
     */
    RING_IDX cons = netdev->tx_ring.req_cons;

    do {
        make_tx_response(netif, txp, NETIF_RSP_ERROR);
        if (cons >= end) {
            break;
        }
        txp = RING_GET_REQUEST(&netdev->tx_ring, cons++);
    } while (1);
    netdev->tx_ring.req_cons = cons;
    netif_schedule_work(netif);
    netif_put(netif);
#else
    net_tx_response(netdev, txp, NETIF_RSP_ERROR);
#endif
}

static void net_tx_packets(struct XenNetDev *netdev)
{
    netif_tx_request_t txreq;
    RING_IDX rc, rp;
    void *page;
    void *tmpbuf = NULL;

    for (;;) {
        rc = netdev->tx_ring.req_cons;
        rp = netdev->tx_ring.sring->req_prod;
        xen_rmb(); /* Ensure we see queued requests up to 'rp'. */

        while ((rc != rp)) {
            if (RING_REQUEST_CONS_OVERFLOW(&netdev->tx_ring, rc)) {
                break;
            }
            memcpy(&txreq, RING_GET_REQUEST(&netdev->tx_ring, rc), sizeof(txreq));
            netdev->tx_ring.req_cons = ++rc;

#if 1
            /* should not happen in theory, we don't announce the *
             * feature-{sg,gso,whatelse} flags in xenstore (yet?) */
            if (txreq.flags & NETTXF_extra_info) {
                xen_be_printf(&netdev->xendev, 0, "FIXME: extra info flag\n");
                net_tx_error(netdev, &txreq, rc);
                continue;
            }
            if (txreq.flags & NETTXF_more_data) {
                xen_be_printf(&netdev->xendev, 0, "FIXME: more data flag\n");
                net_tx_error(netdev, &txreq, rc);
                continue;
            }
#endif

            if (txreq.size < 14) {
                xen_be_printf(&netdev->xendev, 0, "bad packet size: %d\n", txreq.size);
                net_tx_error(netdev, &txreq, rc);
                continue;
            }

            if ((txreq.offset + txreq.size) > XC_PAGE_SIZE) {
                xen_be_printf(&netdev->xendev, 0, "error: page crossing\n");
                net_tx_error(netdev, &txreq, rc);
                continue;
            }

            xen_be_printf(&netdev->xendev, 3, "tx packet ref %d, off %d, len %d, flags 0x%x%s%s%s%s\n",
                          txreq.gref, txreq.offset, txreq.size, txreq.flags,
                          (txreq.flags & NETTXF_csum_blank)     ? " csum_blank"     : "",
                          (txreq.flags & NETTXF_data_validated) ? " data_validated" : "",
                          (txreq.flags & NETTXF_more_data)      ? " more_data"      : "",
                          (txreq.flags & NETTXF_extra_info)     ? " extra_info"     : "");

            page = xc_gnttab_map_grant_ref(netdev->xendev.gnttabdev,
                                           netdev->xendev.dom,
                                           txreq.gref, PROT_READ);
            if (page == NULL) {
                xen_be_printf(&netdev->xendev, 0, "error: tx gref dereference failed (%d)\n",
                              txreq.gref);
                net_tx_error(netdev, &txreq, rc);
                continue;
            }
            if (txreq.flags & NETTXF_csum_blank) {
                /* have read-only mapping -> can't fill checksum in-place */
                if (!tmpbuf) {
                    tmpbuf = g_malloc(XC_PAGE_SIZE);
                }
                memcpy(tmpbuf, page + txreq.offset, txreq.size);
                net_checksum_calculate(tmpbuf, txreq.size);
                qemu_send_packet(qemu_get_queue(netdev->nic), tmpbuf,
                                 txreq.size);
            } else {
                qemu_send_packet(qemu_get_queue(netdev->nic),
                                 page + txreq.offset, txreq.size);
            }
            xc_gnttab_munmap(netdev->xendev.gnttabdev, page, 1);
            net_tx_response(netdev, &txreq, NETIF_RSP_OKAY);
        }
        if (!netdev->tx_work) {
            break;
        }
        netdev->tx_work = 0;
    }
    g_free(tmpbuf);
}

/* ------------------------------------------------------------- */

static void net_rx_response(struct XenNetDev *netdev,
                            netif_rx_request_t *req, int8_t st,
                            uint16_t offset, uint16_t size,
                            uint16_t flags)
{
    RING_IDX i = netdev->rx_ring.rsp_prod_pvt;
    netif_rx_response_t *resp;
    int notify;

    resp = RING_GET_RESPONSE(&netdev->rx_ring, i);
    resp->offset     = offset;
    resp->flags      = flags;
    resp->id         = req->id;
    resp->status     = (int16_t)size;
    if (st < 0) {
        resp->status = (int16_t)st;
    }

    xen_be_printf(&netdev->xendev, 3, "rx response: idx %d, status %d, flags 0x%x\n",
                  i, resp->status, resp->flags);

    netdev->rx_ring.rsp_prod_pvt = ++i;
    RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&netdev->rx_ring, notify);
    if (notify) {
        xen_be_send_notify(&netdev->xendev);
    }
}

#define NET_IP_ALIGN 2

static int net_rx_ok(NetClientState *nc)
{
    struct XenNetDev *netdev = qemu_get_nic_opaque(nc);
    RING_IDX rc, rp;

    if (netdev->xendev.be_state != XenbusStateConnected) {
        return 0;
    }

    rc = netdev->rx_ring.req_cons;
    rp = netdev->rx_ring.sring->req_prod;
    xen_rmb();

    if (rc == rp || RING_REQUEST_CONS_OVERFLOW(&netdev->rx_ring, rc)) {
        xen_be_printf(&netdev->xendev, 2, "%s: no rx buffers (%d/%d)\n",
                      __FUNCTION__, rc, rp);
        return 0;
    }
    return 1;
}

static ssize_t net_rx_packet(NetClientState *nc, const uint8_t *buf, size_t size)
{
    struct XenNetDev *netdev = qemu_get_nic_opaque(nc);
    netif_rx_request_t rxreq;
    RING_IDX rc, rp;
    void *page;

    if (netdev->xendev.be_state != XenbusStateConnected) {
        return -1;
    }

    rc = netdev->rx_ring.req_cons;
    rp = netdev->rx_ring.sring->req_prod;
    xen_rmb(); /* Ensure we see queued requests up to 'rp'. */

    if (rc == rp || RING_REQUEST_CONS_OVERFLOW(&netdev->rx_ring, rc)) {
        xen_be_printf(&netdev->xendev, 2, "no buffer, drop packet\n");
        return -1;
    }
    if (size > XC_PAGE_SIZE - NET_IP_ALIGN) {
        xen_be_printf(&netdev->xendev, 0, "packet too big (%lu > %ld)",
                      (unsigned long)size, XC_PAGE_SIZE - NET_IP_ALIGN);
        return -1;
    }

    memcpy(&rxreq, RING_GET_REQUEST(&netdev->rx_ring, rc), sizeof(rxreq));
    netdev->rx_ring.req_cons = ++rc;

    page = xc_gnttab_map_grant_ref(netdev->xendev.gnttabdev,
                                   netdev->xendev.dom,
                                   rxreq.gref, PROT_WRITE);
    if (page == NULL) {
        xen_be_printf(&netdev->xendev, 0, "error: rx gref dereference failed (%d)\n",
                      rxreq.gref);
        net_rx_response(netdev, &rxreq, NETIF_RSP_ERROR, 0, 0, 0);
        return -1;
    }
    memcpy(page + NET_IP_ALIGN, buf, size);
    xc_gnttab_munmap(netdev->xendev.gnttabdev, page, 1);
    net_rx_response(netdev, &rxreq, NETIF_RSP_OKAY, NET_IP_ALIGN, size, 0);

    return size;
}

/* ------------------------------------------------------------- */

static NetClientInfo net_xen_info = {
    .type = NET_CLIENT_OPTIONS_KIND_NIC,
    .size = sizeof(NICState),
    .can_receive = net_rx_ok,
    .receive = net_rx_packet,
};

static int net_init(struct XenDevice *xendev)
{
    struct XenNetDev *netdev = container_of(xendev, struct XenNetDev, xendev);

    /* read xenstore entries */
    if (netdev->mac == NULL) {
        netdev->mac = xenstore_read_be_str(&netdev->xendev, "mac");
    }

    /* do we have all we need? */
    if (netdev->mac == NULL) {
        return -1;
    }

    if (net_parse_macaddr(netdev->conf.macaddr.a, netdev->mac) < 0) {
        return -1;
    }

    netdev->conf.peer = NULL;

    netdev->nic = qemu_new_nic(&net_xen_info, &netdev->conf,
                               "xen", NULL, netdev);

    snprintf(qemu_get_queue(netdev->nic)->info_str,
             sizeof(qemu_get_queue(netdev->nic)->info_str),
             "nic: xenbus vif macaddr=%s", netdev->mac);

    /* fill info */
    xenstore_write_be_int(&netdev->xendev, "feature-rx-copy", 1);
    xenstore_write_be_int(&netdev->xendev, "feature-rx-flip", 0);

    return 0;
}

static int net_connect(struct XenDevice *xendev)
{
    struct XenNetDev *netdev = container_of(xendev, struct XenNetDev, xendev);
    int rx_copy;

    if (xenstore_read_fe_int(&netdev->xendev, "tx-ring-ref",
                             &netdev->tx_ring_ref) == -1) {
        return -1;
    }
    if (xenstore_read_fe_int(&netdev->xendev, "rx-ring-ref",
                             &netdev->rx_ring_ref) == -1) {
        return 1;
    }
    if (xenstore_read_fe_int(&netdev->xendev, "event-channel",
                             &netdev->xendev.remote_port) == -1) {
        return -1;
    }

    if (xenstore_read_fe_int(&netdev->xendev, "request-rx-copy", &rx_copy) == -1) {
        rx_copy = 0;
    }
    if (rx_copy == 0) {
        xen_be_printf(&netdev->xendev, 0, "frontend doesn't support rx-copy.\n");
        return -1;
    }

    netdev->txs = xc_gnttab_map_grant_ref(netdev->xendev.gnttabdev,
                                          netdev->xendev.dom,
                                          netdev->tx_ring_ref,
                                          PROT_READ | PROT_WRITE);
    netdev->rxs = xc_gnttab_map_grant_ref(netdev->xendev.gnttabdev,
                                          netdev->xendev.dom,
                                          netdev->rx_ring_ref,
                                          PROT_READ | PROT_WRITE);
    if (!netdev->txs || !netdev->rxs) {
        return -1;
    }
    BACK_RING_INIT(&netdev->tx_ring, netdev->txs, XC_PAGE_SIZE);
    BACK_RING_INIT(&netdev->rx_ring, netdev->rxs, XC_PAGE_SIZE);

    xen_be_bind_evtchn(&netdev->xendev);

    xen_be_printf(&netdev->xendev, 1, "ok: tx-ring-ref %d, rx-ring-ref %d, "
                  "remote port %d, local port %d\n",
                  netdev->tx_ring_ref, netdev->rx_ring_ref,
                  netdev->xendev.remote_port, netdev->xendev.local_port);

    net_tx_packets(netdev);
    return 0;
}

static void net_disconnect(struct XenDevice *xendev)
{
    struct XenNetDev *netdev = container_of(xendev, struct XenNetDev, xendev);

    xen_be_unbind_evtchn(&netdev->xendev);

    if (netdev->txs) {
        xc_gnttab_munmap(netdev->xendev.gnttabdev, netdev->txs, 1);
        netdev->txs = NULL;
    }
    if (netdev->rxs) {
        xc_gnttab_munmap(netdev->xendev.gnttabdev, netdev->rxs, 1);
        netdev->rxs = NULL;
    }
    if (netdev->nic) {
        qemu_del_nic(netdev->nic);
        netdev->nic = NULL;
    }
}

static void net_event(struct XenDevice *xendev)
{
    struct XenNetDev *netdev = container_of(xendev, struct XenNetDev, xendev);
    net_tx_packets(netdev);
    qemu_flush_queued_packets(qemu_get_queue(netdev->nic));
}

static int net_free(struct XenDevice *xendev)
{
    struct XenNetDev *netdev = container_of(xendev, struct XenNetDev, xendev);

    g_free(netdev->mac);
    return 0;
}

/* ------------------------------------------------------------- */

struct XenDevOps xen_netdev_ops = {
    .size       = sizeof(struct XenNetDev),
    .flags      = DEVOPS_FLAG_NEED_GNTDEV,
    .init       = net_init,
    .initialise    = net_connect,
    .event      = net_event,
    .disconnect = net_disconnect,
    .free       = net_free,
};
Commit	Line	Data
e613b064 AL	1	/*
	2	* xen paravirt network card backend
	3	*
	4	* (c) Gerd Hoffmann <kraxel@redhat.com>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; under version 2 of the License.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License along
8167ee88	16	* with this program; if not, see <http://www.gnu.org/licenses/>.
6b620ca3 PB	17	*
	18	* Contributions after 2012-01-13 are licensed under the terms of the
	19	* GNU GPL, version 2 or (at your option) any later version.
e613b064 AL	20	*/
	21
	22	#include <stdio.h>
	23	#include <stdlib.h>
	24	#include <stdarg.h>
	25	#include <string.h>
	26	#include <unistd.h>
	27	#include <signal.h>
	28	#include <inttypes.h>
	29	#include <fcntl.h>
	30	#include <errno.h>
e613b064 AL	31	#include <sys/socket.h>
	32	#include <sys/ioctl.h>
	33	#include <sys/types.h>
	34	#include <sys/stat.h>
	35	#include <sys/mman.h>
	36	#include <sys/wait.h>
e613b064	37
e613b064	38	#include "hw.h"
1422e32d	39	#include "net/net.h"
7200ac3c	40	#include "net/checksum.h"
658788c5	41	#include "net/util.h"
e613b064 AL	42	#include "xen_backend.h"
e613b064 AL	43
b41f6719 AP	44	#include <xen/io/netif.h>
b41f6719 AP	45
e613b064 AL	46	/* ------------------------------------------------------------- */
	47
	48	struct XenNetDev {
	49	struct XenDevice xendev; /* must be first */
	50	char *mac;
	51	int tx_work;
	52	int tx_ring_ref;
	53	int rx_ring_ref;
	54	struct netif_tx_sring *txs;
	55	struct netif_rx_sring *rxs;
	56	netif_tx_back_ring_t tx_ring;
	57	netif_rx_back_ring_t rx_ring;
658788c5 MM	58	NICConf conf;
658788c5 MM	59	NICState *nic;
e613b064 AL	60	};
	61
	62	/* ------------------------------------------------------------- */
	63
	64	static void net_tx_response(struct XenNetDev netdev, netif_tx_request_t txp, int8_t st)
	65	{
	66	RING_IDX i = netdev->tx_ring.rsp_prod_pvt;
	67	netif_tx_response_t *resp;
	68	int notify;
	69
	70	resp = RING_GET_RESPONSE(&netdev->tx_ring, i);
	71	resp->id = txp->id;
	72	resp->status = st;
	73
	74	#if 0
209cd7ab AP	75	if (txp->flags & NETTXF_extra_info) {
	76	RING_GET_RESPONSE(&netdev->tx_ring, ++i)->status = NETIF_RSP_NULL;
	77	}
e613b064 AL	78	#endif
	79
	80	netdev->tx_ring.rsp_prod_pvt = ++i;
	81	RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&netdev->tx_ring, notify);
209cd7ab AP	82	if (notify) {
	83	xen_be_send_notify(&netdev->xendev);
	84	}
e613b064 AL	85
e613b064 AL	86	if (i == netdev->tx_ring.req_cons) {
209cd7ab AP	87	int more_to_do;
	88	RING_FINAL_CHECK_FOR_REQUESTS(&netdev->tx_ring, more_to_do);
	89	if (more_to_do) {
	90	netdev->tx_work++;
	91	}
e613b064 AL	92	}
	93	}
	94
	95	static void net_tx_error(struct XenNetDev netdev, netif_tx_request_t txp, RING_IDX end)
	96	{
	97	#if 0
	98	/*
	99	* Hmm, why netback fails everything in the ring?
	100	* Should we do that even when not supporting SG and TSO?
	101	*/
	102	RING_IDX cons = netdev->tx_ring.req_cons;
	103
	104	do {
209cd7ab AP	105	make_tx_response(netif, txp, NETIF_RSP_ERROR);
	106	if (cons >= end) {
	107	break;
	108	}
	109	txp = RING_GET_REQUEST(&netdev->tx_ring, cons++);
e613b064 AL	110	} while (1);
	111	netdev->tx_ring.req_cons = cons;
	112	netif_schedule_work(netif);
	113	netif_put(netif);
	114	#else
	115	net_tx_response(netdev, txp, NETIF_RSP_ERROR);
	116	#endif
	117	}
	118
	119	static void net_tx_packets(struct XenNetDev *netdev)
	120	{
	121	netif_tx_request_t txreq;
	122	RING_IDX rc, rp;
	123	void *page;
	124	void *tmpbuf = NULL;
	125
	126	for (;;) {
209cd7ab AP	127	rc = netdev->tx_ring.req_cons;
	128	rp = netdev->tx_ring.sring->req_prod;
	129	xen_rmb(); /* Ensure we see queued requests up to 'rp'. */
e613b064	130
209cd7ab AP	131	while ((rc != rp)) {
	132	if (RING_REQUEST_CONS_OVERFLOW(&netdev->tx_ring, rc)) {
	133	break;
	134	}
	135	memcpy(&txreq, RING_GET_REQUEST(&netdev->tx_ring, rc), sizeof(txreq));
	136	netdev->tx_ring.req_cons = ++rc;
e613b064 AL	137
e613b064 AL	138	#if 1
209cd7ab AP	139	/* should not happen in theory, we don't announce the *
	140	* feature-{sg,gso,whatelse} flags in xenstore (yet?) */
	141	if (txreq.flags & NETTXF_extra_info) {
	142	xen_be_printf(&netdev->xendev, 0, "FIXME: extra info flag\n");
	143	net_tx_error(netdev, &txreq, rc);
	144	continue;
	145	}
	146	if (txreq.flags & NETTXF_more_data) {
	147	xen_be_printf(&netdev->xendev, 0, "FIXME: more data flag\n");
	148	net_tx_error(netdev, &txreq, rc);
	149	continue;
	150	}
e613b064 AL	151	#endif
e613b064 AL	152
209cd7ab AP	153	if (txreq.size < 14) {
	154	xen_be_printf(&netdev->xendev, 0, "bad packet size: %d\n", txreq.size);
	155	net_tx_error(netdev, &txreq, rc);
	156	continue;
	157	}
	158
	159	if ((txreq.offset + txreq.size) > XC_PAGE_SIZE) {
	160	xen_be_printf(&netdev->xendev, 0, "error: page crossing\n");
	161	net_tx_error(netdev, &txreq, rc);
	162	continue;
	163	}
	164
	165	xen_be_printf(&netdev->xendev, 3, "tx packet ref %d, off %d, len %d, flags 0x%x%s%s%s%s\n",
	166	txreq.gref, txreq.offset, txreq.size, txreq.flags,
	167	(txreq.flags & NETTXF_csum_blank) ? " csum_blank" : "",
	168	(txreq.flags & NETTXF_data_validated) ? " data_validated" : "",
	169	(txreq.flags & NETTXF_more_data) ? " more_data" : "",
	170	(txreq.flags & NETTXF_extra_info) ? " extra_info" : "");
	171
	172	page = xc_gnttab_map_grant_ref(netdev->xendev.gnttabdev,
	173	netdev->xendev.dom,
	174	txreq.gref, PROT_READ);
	175	if (page == NULL) {
	176	xen_be_printf(&netdev->xendev, 0, "error: tx gref dereference failed (%d)\n",
e613b064	177	txreq.gref);
209cd7ab AP	178	net_tx_error(netdev, &txreq, rc);
	179	continue;
	180	}
	181	if (txreq.flags & NETTXF_csum_blank) {
e613b064	182	/* have read-only mapping -> can't fill checksum in-place */
209cd7ab	183	if (!tmpbuf) {
7267c094	184	tmpbuf = g_malloc(XC_PAGE_SIZE);
209cd7ab	185	}
e613b064	186	memcpy(tmpbuf, page + txreq.offset, txreq.size);
209cd7ab	187	net_checksum_calculate(tmpbuf, txreq.size);
b356f76d JW	188	qemu_send_packet(qemu_get_queue(netdev->nic), tmpbuf,
b356f76d JW	189	txreq.size);
e613b064	190	} else {
b356f76d JW	191	qemu_send_packet(qemu_get_queue(netdev->nic),
b356f76d JW	192	page + txreq.offset, txreq.size);
e613b064	193	}
209cd7ab AP	194	xc_gnttab_munmap(netdev->xendev.gnttabdev, page, 1);
	195	net_tx_response(netdev, &txreq, NETIF_RSP_OKAY);
	196	}
	197	if (!netdev->tx_work) {
	198	break;
	199	}
	200	netdev->tx_work = 0;
e613b064	201	}
7267c094	202	g_free(tmpbuf);
e613b064 AL	203	}
	204
	205	/* ------------------------------------------------------------- */
	206
	207	static void net_rx_response(struct XenNetDev *netdev,
209cd7ab AP	208	netif_rx_request_t *req, int8_t st,
	209	uint16_t offset, uint16_t size,
	210	uint16_t flags)
e613b064 AL	211	{
	212	RING_IDX i = netdev->rx_ring.rsp_prod_pvt;
	213	netif_rx_response_t *resp;
	214	int notify;
	215
	216	resp = RING_GET_RESPONSE(&netdev->rx_ring, i);
	217	resp->offset = offset;
	218	resp->flags = flags;
	219	resp->id = req->id;
	220	resp->status = (int16_t)size;
209cd7ab AP	221	if (st < 0) {
	222	resp->status = (int16_t)st;
	223	}
e613b064 AL	224
e613b064 AL	225	xen_be_printf(&netdev->xendev, 3, "rx response: idx %d, status %d, flags 0x%x\n",
209cd7ab	226	i, resp->status, resp->flags);
e613b064 AL	227
	228	netdev->rx_ring.rsp_prod_pvt = ++i;
	229	RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&netdev->rx_ring, notify);
209cd7ab AP	230	if (notify) {
	231	xen_be_send_notify(&netdev->xendev);
	232	}
e613b064 AL	233	}
	234
	235	#define NET_IP_ALIGN 2
	236
4e68f7a0	237	static int net_rx_ok(NetClientState *nc)
e613b064	238	{
cc1f0f45	239	struct XenNetDev *netdev = qemu_get_nic_opaque(nc);
e613b064 AL	240	RING_IDX rc, rp;
e613b064 AL	241
209cd7ab AP	242	if (netdev->xendev.be_state != XenbusStateConnected) {
	243	return 0;
	244	}
e613b064 AL	245
	246	rc = netdev->rx_ring.req_cons;
	247	rp = netdev->rx_ring.sring->req_prod;
	248	xen_rmb();
	249
	250	if (rc == rp \|\| RING_REQUEST_CONS_OVERFLOW(&netdev->rx_ring, rc)) {
209cd7ab AP	251	xen_be_printf(&netdev->xendev, 2, "%s: no rx buffers (%d/%d)\n",
	252	__FUNCTION__, rc, rp);
	253	return 0;
e613b064 AL	254	}
	255	return 1;
	256	}
	257
4e68f7a0	258	static ssize_t net_rx_packet(NetClientState nc, const uint8_t buf, size_t size)
e613b064	259	{
cc1f0f45	260	struct XenNetDev *netdev = qemu_get_nic_opaque(nc);
e613b064 AL	261	netif_rx_request_t rxreq;
	262	RING_IDX rc, rp;
	263	void *page;
	264
209cd7ab AP	265	if (netdev->xendev.be_state != XenbusStateConnected) {
	266	return -1;
	267	}
e613b064 AL	268
	269	rc = netdev->rx_ring.req_cons;
	270	rp = netdev->rx_ring.sring->req_prod;
	271	xen_rmb(); /* Ensure we see queued requests up to 'rp'. */
	272
	273	if (rc == rp \|\| RING_REQUEST_CONS_OVERFLOW(&netdev->rx_ring, rc)) {
209cd7ab AP	274	xen_be_printf(&netdev->xendev, 2, "no buffer, drop packet\n");
209cd7ab AP	275	return -1;
e613b064 AL	276	}
e613b064 AL	277	if (size > XC_PAGE_SIZE - NET_IP_ALIGN) {
209cd7ab AP	278	xen_be_printf(&netdev->xendev, 0, "packet too big (%lu > %ld)",
	279	(unsigned long)size, XC_PAGE_SIZE - NET_IP_ALIGN);
	280	return -1;
e613b064 AL	281	}
	282
	283	memcpy(&rxreq, RING_GET_REQUEST(&netdev->rx_ring, rc), sizeof(rxreq));
	284	netdev->rx_ring.req_cons = ++rc;
	285
	286	page = xc_gnttab_map_grant_ref(netdev->xendev.gnttabdev,
209cd7ab AP	287	netdev->xendev.dom,
209cd7ab AP	288	rxreq.gref, PROT_WRITE);
e613b064	289	if (page == NULL) {
209cd7ab	290	xen_be_printf(&netdev->xendev, 0, "error: rx gref dereference failed (%d)\n",
e613b064	291	rxreq.gref);
209cd7ab AP	292	net_rx_response(netdev, &rxreq, NETIF_RSP_ERROR, 0, 0, 0);
209cd7ab AP	293	return -1;
e613b064 AL	294	}
	295	memcpy(page + NET_IP_ALIGN, buf, size);
	296	xc_gnttab_munmap(netdev->xendev.gnttabdev, page, 1);
	297	net_rx_response(netdev, &rxreq, NETIF_RSP_OKAY, NET_IP_ALIGN, size, 0);
4f1c942b MM	298
4f1c942b MM	299	return size;
e613b064 AL	300	}
	301
	302	/* ------------------------------------------------------------- */
	303
658788c5	304	static NetClientInfo net_xen_info = {
2be64a68	305	.type = NET_CLIENT_OPTIONS_KIND_NIC,
658788c5 MM	306	.size = sizeof(NICState),
	307	.can_receive = net_rx_ok,
	308	.receive = net_rx_packet,
	309	};
	310
e613b064 AL	311	static int net_init(struct XenDevice *xendev)
	312	{
	313	struct XenNetDev *netdev = container_of(xendev, struct XenNetDev, xendev);
e613b064 AL	314
e613b064 AL	315	/* read xenstore entries */
209cd7ab AP	316	if (netdev->mac == NULL) {
	317	netdev->mac = xenstore_read_be_str(&netdev->xendev, "mac");
	318	}
e613b064 AL	319
e613b064 AL	320	/* do we have all we need? */
209cd7ab AP	321	if (netdev->mac == NULL) {
	322	return -1;
	323	}
e613b064	324
209cd7ab	325	if (net_parse_macaddr(netdev->conf.macaddr.a, netdev->mac) < 0) {
658788c5	326	return -1;
209cd7ab	327	}
658788c5	328
658788c5 MM	329	netdev->conf.peer = NULL;
	330
	331	netdev->nic = qemu_new_nic(&net_xen_info, &netdev->conf,
	332	"xen", NULL, netdev);
	333
b356f76d JW	334	snprintf(qemu_get_queue(netdev->nic)->info_str,
b356f76d JW	335	sizeof(qemu_get_queue(netdev->nic)->info_str),
e613b064 AL	336	"nic: xenbus vif macaddr=%s", netdev->mac);
	337
	338	/* fill info */
	339	xenstore_write_be_int(&netdev->xendev, "feature-rx-copy", 1);
	340	xenstore_write_be_int(&netdev->xendev, "feature-rx-flip", 0);
	341
	342	return 0;
	343	}
	344
	345	static int net_connect(struct XenDevice *xendev)
	346	{
	347	struct XenNetDev *netdev = container_of(xendev, struct XenNetDev, xendev);
	348	int rx_copy;
	349
	350	if (xenstore_read_fe_int(&netdev->xendev, "tx-ring-ref",
209cd7ab AP	351	&netdev->tx_ring_ref) == -1) {
	352	return -1;
	353	}
e613b064	354	if (xenstore_read_fe_int(&netdev->xendev, "rx-ring-ref",
209cd7ab AP	355	&netdev->rx_ring_ref) == -1) {
	356	return 1;
	357	}
e613b064	358	if (xenstore_read_fe_int(&netdev->xendev, "event-channel",
209cd7ab AP	359	&netdev->xendev.remote_port) == -1) {
	360	return -1;
	361	}
e613b064	362
209cd7ab AP	363	if (xenstore_read_fe_int(&netdev->xendev, "request-rx-copy", &rx_copy) == -1) {
	364	rx_copy = 0;
	365	}
e613b064	366	if (rx_copy == 0) {
209cd7ab AP	367	xen_be_printf(&netdev->xendev, 0, "frontend doesn't support rx-copy.\n");
209cd7ab AP	368	return -1;
e613b064 AL	369	}
	370
	371	netdev->txs = xc_gnttab_map_grant_ref(netdev->xendev.gnttabdev,
209cd7ab AP	372	netdev->xendev.dom,
	373	netdev->tx_ring_ref,
	374	PROT_READ \| PROT_WRITE);
e613b064	375	netdev->rxs = xc_gnttab_map_grant_ref(netdev->xendev.gnttabdev,
209cd7ab AP	376	netdev->xendev.dom,
	377	netdev->rx_ring_ref,
	378	PROT_READ \| PROT_WRITE);
	379	if (!netdev->txs \|\| !netdev->rxs) {
	380	return -1;
	381	}
e613b064 AL	382	BACK_RING_INIT(&netdev->tx_ring, netdev->txs, XC_PAGE_SIZE);
	383	BACK_RING_INIT(&netdev->rx_ring, netdev->rxs, XC_PAGE_SIZE);
	384
	385	xen_be_bind_evtchn(&netdev->xendev);
	386
	387	xen_be_printf(&netdev->xendev, 1, "ok: tx-ring-ref %d, rx-ring-ref %d, "
209cd7ab AP	388	"remote port %d, local port %d\n",
	389	netdev->tx_ring_ref, netdev->rx_ring_ref,
	390	netdev->xendev.remote_port, netdev->xendev.local_port);
3e3cabcf GH	391
3e3cabcf GH	392	net_tx_packets(netdev);
e613b064 AL	393	return 0;
	394	}
	395
	396	static void net_disconnect(struct XenDevice *xendev)
	397	{
	398	struct XenNetDev *netdev = container_of(xendev, struct XenNetDev, xendev);
	399
	400	xen_be_unbind_evtchn(&netdev->xendev);
	401
	402	if (netdev->txs) {
209cd7ab AP	403	xc_gnttab_munmap(netdev->xendev.gnttabdev, netdev->txs, 1);
209cd7ab AP	404	netdev->txs = NULL;
e613b064 AL	405	}
e613b064 AL	406	if (netdev->rxs) {
209cd7ab AP	407	xc_gnttab_munmap(netdev->xendev.gnttabdev, netdev->rxs, 1);
209cd7ab AP	408	netdev->rxs = NULL;
e613b064	409	}
658788c5	410	if (netdev->nic) {
948ecf21	411	qemu_del_nic(netdev->nic);
658788c5	412	netdev->nic = NULL;
e613b064 AL	413	}
	414	}
	415
	416	static void net_event(struct XenDevice *xendev)
	417	{
	418	struct XenNetDev *netdev = container_of(xendev, struct XenNetDev, xendev);
	419	net_tx_packets(netdev);
b356f76d	420	qemu_flush_queued_packets(qemu_get_queue(netdev->nic));
e613b064 AL	421	}
	422
	423	static int net_free(struct XenDevice *xendev)
	424	{
	425	struct XenNetDev *netdev = container_of(xendev, struct XenNetDev, xendev);
	426
7267c094	427	g_free(netdev->mac);
e613b064 AL	428	return 0;
	429	}
	430
	431	/* ------------------------------------------------------------- */
	432
	433	struct XenDevOps xen_netdev_ops = {
	434	.size = sizeof(struct XenNetDev),
	435	.flags = DEVOPS_FLAG_NEED_GNTDEV,
	436	.init = net_init,
384087b2	437	.initialise = net_connect,
e613b064 AL	438	.event = net_event,
	439	.disconnect = net_disconnect,
	440	.free = net_free,
	441	};