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virtio: virtio-net driver

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This commit is contained in:
Arne Welzel 2012-12-15 13:55:07 +01:00 committed by Ben Gras
parent a27b60af75
commit d19844d69c
5 changed files with 884 additions and 1 deletions
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2
drivers/Makefile
View file

@ -19,7 +19,7 @@ SUBDIR= tty
SUBDIR= ahci amddev atl2 at_wini audio dec21140A dp8390 dpeth \
e1000 fbd filter floppy fxp hello lance log mmc orinoco pci printer \
random readclock rtl8139 rtl8169 ti1225 tty vbox acpi \
virtio_blk
virtio_blk virtio_net
.endif
.if ${MACHINE_ARCH} == "earm"

18
drivers/virtio_net/Makefile Normal file
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@ -0,0 +1,18 @@
#
# Makefile for virtio_net
#
PROG= virtio_net
SRCS= virtio_net.c
FILES=$(PROG).conf
FILESNAME=$(PROG)
FILESDIR= /etc/system.conf.d
DPADD+= ${LIBNETDRIVER} ${LIBSYS} ${LIBVIRTIO}
LDADD+= -lnetdriver -lsys -lvirtio
MAN=
BINDIR?= /usr/sbin
.include <minix.service.mk>

680
drivers/virtio_net/virtio_net.c Normal file
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@ -0,0 +1,680 @@
/* virtio net driver for MINIX 3
*
* Copyright (c) 2013, A. Welzel, <arne.welzel@gmail.com>
*
* This software is released under the BSD license. See the LICENSE file
* included in the main directory of this source distribution for the
* license terms and conditions.
*/
#include <assert.h>
#include <sys/types.h>
#include <net/gen/ether.h>
#include <net/gen/eth_io.h>
#include <minix/drivers.h>
#include <minix/netdriver.h>
#include <minix/sysutil.h>
#include <minix/virtio.h>
#include <sys/queue.h>
#include "virtio_net.h"
#define dput(s) do { dprintf(s); printf("\n"); } while (0)
#define dprintf(s) do { \
printf("%s: ", name); \
printf s; \
} while (0)
static struct virtio_device *net_dev;
static const char *const name = "virtio-net";
enum queue {RX_Q, TX_Q, CTRL_Q};
/* Number of packets to work with */
/* TODO: This should be an argument to the driver and possibly also
* depend on the queue sizes offered by this device.
*/
#define BUF_PACKETS 64
/* Maximum size of a packet */
#define MAX_PACK_SIZE ETH_MAX_PACK_SIZE
/* Buffer size needed for the payload of BUF_PACKETS */
#define PACKET_BUF_SZ (BUF_PACKETS * MAX_PACK_SIZE)
struct packet {
int idx;
struct virtio_net_hdr *vhdr;
phys_bytes phdr;
char *vdata;
phys_bytes pdata;
STAILQ_ENTRY(packet) next;
};
/* Allocated data chunks */
static char *data_vir;
static phys_bytes data_phys;
static struct virtio_net_hdr *hdrs_vir;
static phys_bytes hdrs_phys;
static struct packet *packets;
static int in_rx;
static int started;
/* Packets on this list can be given to the host */
static STAILQ_HEAD(free_list, packet) free_list;
/* Packets on this list are to be given to inet */
static STAILQ_HEAD(recv_list, packet) recv_list;
/* State about pending inet messages */
static int rx_pending;
static message pending_rx_msg;
static int tx_pending;
static message pending_tx_msg;
/* Various state data */
static u8_t virtio_net_mac[6];
static eth_stat_t virtio_net_stats;
static int spurious_interrupt;
/* Prototypes */
static int virtio_net_probe(int skip);
static int virtio_net_config(void);
static int virtio_net_alloc_bufs(void);
static void virtio_net_init_queues(void);
static void virtio_net_refill_rx_queue(void);
static void virtio_net_check_queues(void);
static void virtio_net_check_pending(void);
static void virtio_net_fetch_iovec(iovec_s_t *iov, message *m);
static int virtio_net_cpy_to_user(message *m);
static int virtio_net_cpy_from_user(message *m);
static void virtio_net_intr(message *m);
static void virtio_net_write(message *m);
static void virtio_net_read(message *m);
static void virtio_net_conf(message *m);
static void virtio_net_getstat(message *m);
static void virtio_net_notify(message *m);
static void virtio_net_msg(message *m);
static void virtio_net_main_loop(void);
static void sef_local_startup(void);
static int sef_cb_init_fresh(int type, sef_init_info_t *info);
static void sef_cb_signal_handler(int signo);
/* TODO: Features are pretty much ignored */
struct virtio_feature netf[] = {
{ "partial csum", VIRTIO_NET_F_CSUM, 0, 0 },
{ "given mac", VIRTIO_NET_F_MAC, 0, 0 },
{ "status ", VIRTIO_NET_F_STATUS, 0, 0 },
{ "control channel", VIRTIO_NET_F_CTRL_VQ, 0, 0 },
{ "control channel rx", VIRTIO_NET_F_CTRL_RX, 0, 0 }
};
static int
virtio_net_probe(int skip)
{
/* virtio-net has at least 2 queues */
int queues = 2;
net_dev= virtio_setup_device(0x00001, name, netf,
sizeof(netf) / sizeof(netf[0]),
1 /* threads */, skip);
if (net_dev == NULL)
return ENXIO;
/* If the host supports the control queue, allocate it as well */
if (virtio_host_supports(net_dev, VIRTIO_NET_F_CTRL_VQ))
queues += 1;
if (virtio_alloc_queues(net_dev, queues) != OK) {
virtio_free_device(net_dev);
return ENOMEM;
}
return OK;
}
static int
virtio_net_config(void)
{
u32_t mac14;
u32_t mac56;
int i;
if (virtio_host_supports(net_dev, VIRTIO_NET_F_MAC)) {
dprintf(("Mac set by host: "));
mac14 = virtio_sread32(net_dev, 0);
mac56 = virtio_sread32(net_dev, 4);
*(u32_t*)virtio_net_mac = mac14;
*(u16_t*)(virtio_net_mac + 4) = mac56;
for (i = 0; i < 6; i++)
printf("%02x%s", virtio_net_mac[i],
i == 5 ? "\n" : ":");
} else {
dput(("No mac"));
}
if (virtio_host_supports(net_dev, VIRTIO_NET_F_STATUS)) {
dput(("Current Status %x", (u32_t)virtio_sread16(net_dev, 6)));
} else {
dput(("No status"));
}
if (virtio_host_supports(net_dev, VIRTIO_NET_F_CTRL_VQ))
dput(("Host supports control channel"));
if (virtio_host_supports(net_dev, VIRTIO_NET_F_CTRL_RX))
dput(("Host supports control channel for RX"));
return OK;
}
static int
virtio_net_alloc_bufs(void)
{
data_vir = alloc_contig(PACKET_BUF_SZ, 0, &data_phys);
if (!data_vir)
return ENOMEM;
hdrs_vir = alloc_contig(BUF_PACKETS * sizeof(hdrs_vir[0]),
0, &hdrs_phys);
if (!hdrs_vir) {
free_contig(data_vir, PACKET_BUF_SZ);
return ENOMEM;
}
packets = malloc(BUF_PACKETS * sizeof(packets[0]));
if (!packets) {
free_contig(data_vir, PACKET_BUF_SZ);
free_contig(hdrs_vir, BUF_PACKETS * sizeof(hdrs_vir[0]));
return ENOMEM;
}
memset(data_vir, 0, PACKET_BUF_SZ);
memset(hdrs_vir, 0, BUF_PACKETS * sizeof(hdrs_vir[0]));
memset(packets, 0, BUF_PACKETS * sizeof(packets[0]));
return OK;
}
static void
virtio_net_init_queues(void)
{
int i;
STAILQ_INIT(&free_list);
STAILQ_INIT(&recv_list);
for (i = 0; i < BUF_PACKETS; i++) {
packets[i].idx = i;
packets[i].vhdr = &hdrs_vir[i];
packets[i].phdr = hdrs_phys + i * sizeof(hdrs_vir[i]);
packets[i].vdata = data_vir + i * MAX_PACK_SIZE;
packets[i].pdata = data_phys + i * MAX_PACK_SIZE;
STAILQ_INSERT_HEAD(&free_list, &packets[i], next);
}
}
static void
virtio_net_refill_rx_queue(void)
{
struct vumap_phys phys[2];
struct packet *p;
while ((in_rx < BUF_PACKETS / 2) && !STAILQ_EMPTY(&free_list)) {
/* peek */
p = STAILQ_FIRST(&free_list);
/* remove */
STAILQ_REMOVE_HEAD(&free_list, next);
phys[0].vp_addr = p->phdr;
assert(!(phys[0].vp_addr & 1));
phys[0].vp_size = sizeof(struct virtio_net_hdr);
phys[1].vp_addr = p->pdata;
assert(!(phys[1].vp_addr & 1));
phys[1].vp_size = MAX_PACK_SIZE;
/* RX queue needs write */
phys[0].vp_addr |= 1;
phys[1].vp_addr |= 1;
virtio_to_queue(net_dev, RX_Q, phys, 2, p);
in_rx++;
}
if (in_rx == 0 && STAILQ_EMPTY(&free_list)) {
dput(("warning: rx queue underflow!"));
virtio_net_stats.ets_fifoUnder++;
}
}
static void
virtio_net_check_queues(void)
{
struct packet *p;
/* Put the received packets into the recv list */
while (virtio_from_queue(net_dev, RX_Q, (void **)&p) == 0) {
STAILQ_INSERT_TAIL(&recv_list, p, next);
in_rx--;
virtio_net_stats.ets_packetR++;
}
/* Packets from the TX queue just indicated they are free to
* be reused now. inet already knows about them as being sent.
*/
while (virtio_from_queue(net_dev, TX_Q, (void **)&p) == 0) {
memset(p->vhdr, 0, sizeof(*p->vhdr));
memset(p->vdata, 0, MAX_PACK_SIZE);
STAILQ_INSERT_HEAD(&free_list, p, next);
virtio_net_stats.ets_packetT++;
}
}
static void
virtio_net_check_pending(void)
{
int dst = 0xDEAD;
int r;
message reply;
reply.m_type = DL_TASK_REPLY;
reply.DL_FLAGS = DL_NOFLAGS;
reply.DL_COUNT = 0;
/* Pending read and something in recv_list? */
if (!STAILQ_EMPTY(&recv_list) && rx_pending) {
dst = pending_rx_msg.m_source;
reply.DL_COUNT = virtio_net_cpy_to_user(&pending_rx_msg);
reply.DL_FLAGS |= DL_PACK_RECV;
rx_pending = 0;
}
if (!STAILQ_EMPTY(&free_list) && tx_pending) {
dst = pending_tx_msg.m_source;
virtio_net_cpy_from_user(&pending_tx_msg);
reply.DL_FLAGS |= DL_PACK_SEND;
tx_pending = 0;
}
/* Only reply if a pending request was handled */
if (reply.DL_FLAGS != DL_NOFLAGS)
if ((r = send(dst, &reply)) != OK)
panic("%s: send to %d failed (%d)", name, dst, r);
}
static void
virtio_net_fetch_iovec(iovec_s_t *iov, message *m)
{
int r;
r = sys_safecopyfrom(m->m_source, m->DL_GRANT, 0, (vir_bytes)iov,
m->DL_COUNT * sizeof(iov[0]));
if (r != OK)
panic("%s: iovec fail for %d (%d)", name, m->m_source, r);
}
static int
virtio_net_cpy_to_user(message *m)
{
/* Hmm, this looks so similar to cpy_from_user... TODO */
int i, r, size, ivsz;
int left = MAX_PACK_SIZE; /* Try copying the whole packet */
int bytes = 0;
iovec_s_t iovec[NR_IOREQS];
struct packet *p;
/* This should only be called if recv_list has some entries */
assert(!STAILQ_EMPTY(&recv_list));
p = STAILQ_FIRST(&recv_list);
STAILQ_REMOVE_HEAD(&recv_list, next);
virtio_net_fetch_iovec(iovec, m);
for (i = 0; i < m->DL_COUNT && left > 0; i++) {
ivsz = iovec[i].iov_size;
size = left > ivsz ? ivsz : left;
r = sys_safecopyto(m->m_source, iovec[i].iov_grant, 0,
(vir_bytes) p->vdata + bytes, size);
if (r != OK)
panic("%s: copy to %d failed (%d)", name,
m->m_source,
r);
left -= size;
bytes += size;
}
if (left != 0)
dput(("Uhm... left=%d", left));
/* Clean the packet */
memset(p->vhdr, 0, sizeof(*p->vhdr));
memset(p->vdata, 0, MAX_PACK_SIZE);
STAILQ_INSERT_HEAD(&free_list, p, next);
return bytes;
}
static int
sys_easy_vsafecopy_from(endpoint_t src_proc, iovec_s_t *iov, int count,
vir_bytes dst, size_t max, size_t *copied)
{
int i, r;
size_t left = max;
vir_bytes cur_off = 0;
struct vscp_vec vv[NR_IOREQS];
for (i = 0; i < count && left > 0; i++) {
vv[i].v_from = src_proc;
vv[i].v_to = SELF;
vv[i].v_gid = iov[i].iov_grant;
vv[i].v_offset = 0;
vv[i].v_addr = dst + cur_off;
vv[i].v_bytes = iov[i].iov_size;
/* More data in iov than the buffer can hold, this should be
* manageable by the caller.
*/
if (left - vv[i].v_bytes > left) {
printf("sys_easy_vsafecopy_from: buf too small!\n");
return ENOMEM;
}
left -= iov[i].iov_size;
cur_off += iov[i].iov_size;
}
/* Now that we prepared the vscp_vec, we can call vsafecopy() */
if ((r = sys_vsafecopy(vv, count)) != OK)
printf("sys_vsafecopy: failed: (%d)\n", r);
if (copied)
*copied = cur_off;
return OK;
}
static int
virtio_net_cpy_from_user(message *m)
{
/* Put user bytes into a a free packet buffer and
* then forward this packet to the TX queue.
*/
int r;
iovec_s_t iovec[NR_IOREQS];
struct vumap_phys phys[2];
struct packet *p;
size_t bytes;
/* This should only be called if free_list has some entries */
assert(!STAILQ_EMPTY(&free_list));
p = STAILQ_FIRST(&free_list);
STAILQ_REMOVE_HEAD(&free_list, next);
virtio_net_fetch_iovec(iovec, m);
r = sys_easy_vsafecopy_from(m->m_source, iovec, m->DL_COUNT,
(vir_bytes)p->vdata, MAX_PACK_SIZE,
&bytes);
if (r != OK)
panic("%s: copy from %d failed", name, m->m_source);
phys[0].vp_addr = p->phdr;
assert(!(phys[0].vp_addr & 1));
phys[0].vp_size = sizeof(struct virtio_net_hdr);
phys[1].vp_addr = p->pdata;
assert(!(phys[1].vp_addr & 1));
phys[1].vp_size = bytes;
virtio_to_queue(net_dev, TX_Q, phys, 2, p);
return bytes;
}
static void
virtio_net_intr(message *m)
{
/* Check and clear interrupt flag */
if (virtio_had_irq(net_dev)) {
virtio_net_check_queues();
} else {
if (!spurious_interrupt)
dput(("Spurious interrupt"));
spurious_interrupt = 1;
}
virtio_net_check_pending();
virtio_irq_enable(net_dev);
}
static void
virtio_net_write(message *m)
{
int r;
message reply;
reply.m_type = DL_TASK_REPLY;
reply.DL_FLAGS = DL_NOFLAGS;
reply.DL_COUNT = 0;
if (!STAILQ_EMPTY(&free_list)) {
/* free_list contains at least one packet, use it */
reply.DL_COUNT = virtio_net_cpy_from_user(m);
reply.DL_FLAGS = DL_PACK_SEND;
} else {
pending_tx_msg = *m;
tx_pending = 1;
}
if ((r = send(m->m_source, &reply)) != OK)
panic("%s: send to %d failed (%d)", name, m->m_source, r);
}
static void
virtio_net_read(message *m)
{
int r;
message reply;
reply.m_type = DL_TASK_REPLY;
reply.DL_FLAGS = DL_NOFLAGS;
reply.DL_COUNT = 0;
if (!STAILQ_EMPTY(&recv_list)) {
/* recv_list contains at least one packet, copy it */
reply.DL_COUNT = virtio_net_cpy_to_user(m);
reply.DL_FLAGS = DL_PACK_RECV;
} else {
rx_pending = 1;
pending_rx_msg = *m;
}
if ((r = send(m->m_source, &reply)) != OK)
panic("%s: send to %d failed (%d)", name, m->m_source, r);
}
static void
virtio_net_conf(message *m)
{
/* TODO: Add the multicast, broadcast filtering etc. */
int i, r;
message reply;
/* If this is the first CONF message we see, fully initialize
* the device now.
*/
if (!started) {
started = 1;
virtio_device_ready(net_dev);
virtio_irq_enable(net_dev);
}
/* Prepare reply */
for (i = 0; i < sizeof(virtio_net_mac); i++)
((u8_t*)reply.DL_HWADDR)[i] = virtio_net_mac[i];
reply.m_type = DL_CONF_REPLY;
reply.DL_STAT = OK;
reply.DL_COUNT = 0;
if ((r = send(m->m_source, &reply)) != OK)
panic("%s: send to %d failed (%d)", name, m->m_source, r);
}
static void
virtio_net_getstat(message *m)
{
int r;
message reply;
reply.m_type = DL_STAT_REPLY;
reply.DL_STAT = OK;
reply.DL_COUNT = 0;
r = sys_safecopyto(m->m_source, m->DL_GRANT, 0,
(vir_bytes)&virtio_net_stats,
sizeof(virtio_net_stats));
if (r != OK)
panic("%s: copy to %d failed (%d)", name, m->m_source, r);
if ((r = send(m->m_source, &reply)) != OK)
panic("%s: send to %d failed (%d)", name, m->m_source, r);
}
static void
virtio_net_notify(message *m)
{
if (_ENDPOINT_P(m->m_source) == HARDWARE)
virtio_net_intr(m);
}
static void
virtio_net_msg(message *m)
{
switch (m->m_type) {
case DL_WRITEV_S:
virtio_net_write(m);
break;
case DL_READV_S:
virtio_net_read(m);
break;
case DL_CONF:
virtio_net_conf(m);
break;
case DL_GETSTAT_S:
virtio_net_getstat(m);
break;
default:
panic("%s: illegal message: %d", name, m->m_type);
}
}
static void
virtio_net_main_loop(void)
{
message m;
int ipc_status;
int r;
while (TRUE) {
virtio_net_refill_rx_queue();
if ((r = netdriver_receive(ANY, &m, &ipc_status)) != OK)
panic("%s: netdriver_receive failed: %d", name, r);
if (is_ipc_notify(ipc_status))
virtio_net_notify(&m);
else
virtio_net_msg(&m);
}
}
int
main(int argc, char *argv[])
{
env_setargs(argc, argv);
sef_local_startup();
virtio_net_main_loop();
}
static void
sef_local_startup()
{
sef_setcb_init_fresh(sef_cb_init_fresh);
sef_setcb_init_lu(sef_cb_init_fresh);
sef_setcb_init_restart(sef_cb_init_fresh);
sef_setcb_lu_prepare(sef_cb_lu_prepare_always_ready);
sef_setcb_lu_state_isvalid(sef_cb_lu_state_isvalid_workfree);
sef_setcb_signal_handler(sef_cb_signal_handler);
sef_startup();
}
static int
sef_cb_init_fresh(int type, sef_init_info_t *info)
{
long instance = 0;
env_parse("instance", "d", 0, &instance, 0, 255);
if (virtio_net_probe((int)instance) != OK)
panic("%s: No device found", name);
if (virtio_net_config() != OK)
panic("%s: No device found", name);
if (virtio_net_alloc_bufs() != OK)
panic("%s: Buffer allocation failed", name);
virtio_net_init_queues();
netdriver_announce();
return(OK);
}
static void
sef_cb_signal_handler(int signo)
{
if (signo != SIGTERM)
return;
dput(("Terminating"));
free_contig(data_vir, PACKET_BUF_SZ);
free_contig(hdrs_vir, BUF_PACKETS * sizeof(hdrs_vir[0]));
free(packets);
virtio_reset_device(net_dev);
virtio_free_queues(net_dev);
virtio_free_device(net_dev);
net_dev = NULL;
exit(1);
}

13
drivers/virtio_net/virtio_net.conf Normal file
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@ -0,0 +1,13 @@
service virtio_net
{
type net;
descr "Virtio network device";
system
UMAP
VUMAP
IRQCTL
DEVIO
;
pci device 1af4/1000;
}

172
drivers/virtio_net/virtio_net.h Normal file
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@ -0,0 +1,172 @@
#ifndef _LINUX_VIRTIO_NET_H
#define _LINUX_VIRTIO_NET_H
/* This header is BSD licensed so anyone can use the definitions to implement
* compatible drivers/servers.
*
* 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.
* 3. Neither the name of IBM nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 IBM 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. */
#if 0
#include <linux/types.h>
#include <linux/virtio_ids.h>
#include <linux/virtio_config.h>
#include <linux/if_ether.h>
#endif
/* The feature bitmap for virtio net */
#define VIRTIO_NET_F_CSUM 0 /* Host handles pkts w/ partial csum */
#define VIRTIO_NET_F_GUEST_CSUM 1 /* Guest handles pkts w/ partial csum */
#define VIRTIO_NET_F_MAC 5 /* Host has given MAC address. */
#define VIRTIO_NET_F_GSO 6 /* Host handles pkts w/ any GSO type */
#define VIRTIO_NET_F_GUEST_TSO4 7 /* Guest can handle TSOv4 in. */
#define VIRTIO_NET_F_GUEST_TSO6 8 /* Guest can handle TSOv6 in. */
#define VIRTIO_NET_F_GUEST_ECN 9 /* Guest can handle TSO[6] w/ ECN in. */
#define VIRTIO_NET_F_GUEST_UFO 10 /* Guest can handle UFO in. */
#define VIRTIO_NET_F_HOST_TSO4 11 /* Host can handle TSOv4 in. */
#define VIRTIO_NET_F_HOST_TSO6 12 /* Host can handle TSOv6 in. */
#define VIRTIO_NET_F_HOST_ECN 13 /* Host can handle TSO[6] w/ ECN in. */
#define VIRTIO_NET_F_HOST_UFO 14 /* Host can handle UFO in. */
#define VIRTIO_NET_F_MRG_RXBUF 15 /* Host can merge receive buffers. */
#define VIRTIO_NET_F_STATUS 16 /* virtio_net_config.status available */
#define VIRTIO_NET_F_CTRL_VQ 17 /* Control channel available */
#define VIRTIO_NET_F_CTRL_RX 18 /* Control channel RX mode support */
#define VIRTIO_NET_F_CTRL_VLAN 19 /* Control channel VLAN filtering */
#define VIRTIO_NET_F_CTRL_RX_EXTRA 20 /* Extra RX mode control support */
#define VIRTIO_NET_F_GUEST_ANNOUNCE 21 /* Guest can announce device on the
* network */
#define VIRTIO_NET_S_LINK_UP 1 /* Link is up */
#define VIRTIO_NET_S_ANNOUNCE 2 /* Announcement is needed */
struct virtio_net_config {
/* The config defining mac address (if VIRTIO_NET_F_MAC) */
u8_t mac[6];
/* See VIRTIO_NET_F_STATUS and VIRTIO_NET_S_* above */
u16_t status;
} __attribute__((packed));
/* This is the first element of the scatter-gather list. If you don't
* specify GSO or CSUM features, you can simply ignore the header. */
struct virtio_net_hdr {
#define VIRTIO_NET_HDR_F_NEEDS_CSUM 1 // Use csum_start, csum_offset
#define VIRTIO_NET_HDR_F_DATA_VALID 2 // Csum is valid
u8_t flags;
#define VIRTIO_NET_HDR_GSO_NONE 0 // Not a GSO frame
#define VIRTIO_NET_HDR_GSO_TCPV4 1 // GSO frame, IPv4 TCP (TSO)
#define VIRTIO_NET_HDR_GSO_UDP 3 // GSO frame, IPv4 UDP (UFO)
#define VIRTIO_NET_HDR_GSO_TCPV6 4 // GSO frame, IPv6 TCP
#define VIRTIO_NET_HDR_GSO_ECN 0x80 // TCP has ECN set
u8_t gso_type;
u16_t hdr_len; /* Ethernet + IP + tcp/udp hdrs */
u16_t gso_size; /* Bytes to append to hdr_len per frame */
u16_t csum_start; /* Position to start checksumming from */
u16_t csum_offset; /* Offset after that to place checksum */
};
/* This is the version of the header to use when the MRG_RXBUF
* feature has been negotiated. */
struct virtio_net_hdr_mrg_rxbuf {
struct virtio_net_hdr hdr;
u16_t num_buffers; /* Number of merged rx buffers */
};
/*
* Control virtqueue data structures
*
* The control virtqueue expects a header in the first sg entry
* and an ack/status response in the last entry. Data for the
* command goes in between.
*/
struct virtio_net_ctrl_hdr {
u8_t class;
u8_t cmd;
} __attribute__((packed));
typedef u8_t virtio_net_ctrl_ack;
#define VIRTIO_NET_OK 0
#define VIRTIO_NET_ERR 1
/*
* Control the RX mode, ie. promisucous, allmulti, etc...
* All commands require an "out" sg entry containing a 1 byte
* state value, zero = disable, non-zero = enable. Commands
* 0 and 1 are supported with the VIRTIO_NET_F_CTRL_RX feature.
* Commands 2-5 are added with VIRTIO_NET_F_CTRL_RX_EXTRA.
*/
#define VIRTIO_NET_CTRL_RX 0
#define VIRTIO_NET_CTRL_RX_PROMISC 0
#define VIRTIO_NET_CTRL_RX_ALLMULTI 1
#define VIRTIO_NET_CTRL_RX_ALLUNI 2
#define VIRTIO_NET_CTRL_RX_NOMULTI 3
#define VIRTIO_NET_CTRL_RX_NOUNI 4
#define VIRTIO_NET_CTRL_RX_NOBCAST 5
/*
* Control the MAC filter table.
*
* The MAC filter table is managed by the hypervisor, the guest should
* assume the size is infinite. Filtering should be considered
* non-perfect, ie. based on hypervisor resources, the guest may
* received packets from sources not specified in the filter list.
*
* In addition to the class/cmd header, the TABLE_SET command requires
* two out scatterlists. Each contains a 4 byte count of entries followed
* by a concatenated byte stream of the ETH_ALEN MAC addresses. The
* first sg list contains unicast addresses, the second is for multicast.
* This functionality is present if the VIRTIO_NET_F_CTRL_RX feature
* is available.
*/
struct virtio_net_ctrl_mac {
u32_t entries;
#define ETH_ALEN 6
u8_t macs[][ETH_ALEN];
} __attribute__((packed));
#define VIRTIO_NET_CTRL_MAC 1
#define VIRTIO_NET_CTRL_MAC_TABLE_SET 0
/*
* Control VLAN filtering
*
* The VLAN filter table is controlled via a simple ADD/DEL interface.
* VLAN IDs not added may be filterd by the hypervisor. Del is the
* opposite of add. Both commands expect an out entry containing a 2
* byte VLAN ID. VLAN filterting is available with the
* VIRTIO_NET_F_CTRL_VLAN feature bit.
*/
#define VIRTIO_NET_CTRL_VLAN 2
#define VIRTIO_NET_CTRL_VLAN_ADD 0
#define VIRTIO_NET_CTRL_VLAN_DEL 1
/*
* Control link announce acknowledgement
*
* The command VIRTIO_NET_CTRL_ANNOUNCE_ACK is used to indicate that
* driver has recevied the notification; device would clear the
* VIRTIO_NET_S_ANNOUNCE bit in the status field after it receives
* this command.
*/
#define VIRTIO_NET_CTRL_ANNOUNCE 3
#define VIRTIO_NET_CTRL_ANNOUNCE_ACK 0
#endif /* _LINUX_VIRTIO_NET_H */