The following changes since commit 6632f6ff96f0537fc34cdc00c760656fc62e23c5:

Merge remote-tracking branch 'remotes/famz/tags/block-and-testing-pull-request' into staging (2017-07-17 11:46:36 +0100)

for you to fetch changes up to 189ae6bb5ce1f5a322f8691d00fe942ba43dd601:

virtio-net: fix offload ctrl endian (2017-07-17 20:13:56 +0800)

- fix virtio-net ctrl offload endian

- vnet header support for variou COLO netfilters and compare thread

----------------------------------------------------------------

Jason Wang (1):

virtio-net: fix offload ctrl endian

Michal Privoznik (1):

virtion-net: Prefer is_power_of_2()

Zhang Chen (12):

net: Add vnet_hdr_len arguments in NetClientState

net/net.c: Add vnet_hdr support in SocketReadState

net/filter-mirror.c: Introduce parameter for filter_send()

net/filter-mirror.c: Make filter mirror support vnet support.

net/filter-mirror.c: Add new option to enable vnet support for filter-redirector

net/colo.c: Make vnet_hdr_len as packet property

net/colo-compare.c: Introduce parameter for compare_chr_send()

net/colo-compare.c: Make colo-compare support vnet_hdr_len

net/colo.c: Add vnet packet parse feature in colo-proxy

net/colo-compare.c: Add vnet packet's tcp/udp/icmp compare

net/filter-rewriter.c: Make filter-rewriter support vnet_hdr_len

docs/colo-proxy.txt: Update colo-proxy usage of net driver with vnet_header

docs/colo-proxy.txt | 26 ++++++++++++++++

hw/net/virtio-net.c | 4 ++-

include/net/net.h | 10 ++++--

net/colo-compare.c | 84 ++++++++++++++++++++++++++++++++++++++++++---------

net/colo.c | 9 +++---

net/colo.h | 4 ++-

net/filter-mirror.c | 75 +++++++++++++++++++++++++++++++++++++++++----

net/filter-rewriter.c | 37 ++++++++++++++++++++++-

net/net.c | 37 ++++++++++++++++++++---

net/socket.c | 8 ++---

qemu-options.hx | 19 ++++++------

11 files changed, 265 insertions(+), 48 deletions(-)

From: Zhang Chen <zhangchen.fnst@cn.fujitsu.com>

We add the vnet_hdr_support option for filter-redirector, default is disabled.

If you use virtio-net-pci net driver or other driver needs vnet_hdr, please enable it.

Because colo-compare or other modules needs the vnet_hdr_len to parse

packet, we add this new option send the len to others.

You can use it for example:

-object filter-redirector,id=r0,netdev=hn0,queue=tx,outdev=red0,vnet_hdr_support

Signed-off-by: Zhang Chen <zhangchen.fnst@cn.fujitsu.com>

net/filter-mirror.c | 23 +++++++++++++++++++++++

qemu-options.hx | 6 +++---

2 files changed, 26 insertions(+), 3 deletions(-)

diff --git a/net/filter-mirror.c b/net/filter-mirror.c

--- a/net/filter-mirror.c

+++ b/net/filter-mirror.c

@@ -XXX,XX +XXX,XX @@ static void filter_redirector_set_outdev(Object *obj,

s->outdev = g_strdup(value);

+static bool filter_redirector_get_vnet_hdr(Object *obj, Error **errp)

+{

+ MirrorState *s = FILTER_REDIRECTOR(obj);

+

+ return s->vnet_hdr;

+}

+

+static void filter_redirector_set_vnet_hdr(Object *obj,

+ bool value,

+ Error **errp)

+{

+ MirrorState *s = FILTER_REDIRECTOR(obj);

+

+ s->vnet_hdr = value;

+}

+

static void filter_mirror_init(Object *obj)

MirrorState *s = FILTER_MIRROR(obj);

@@ -XXX,XX +XXX,XX @@ static void filter_mirror_init(Object *obj)

static void filter_redirector_init(Object *obj)

+ MirrorState *s = FILTER_REDIRECTOR(obj);

+

object_property_add_str(obj, "indev", filter_redirector_get_indev,

filter_redirector_set_indev, NULL);

object_property_add_str(obj, "outdev", filter_redirector_get_outdev,

filter_redirector_set_outdev, NULL);

+

+ s->vnet_hdr = false;

+ object_property_add_bool(obj, "vnet_hdr_support",

+ filter_redirector_get_vnet_hdr,

+ filter_redirector_set_vnet_hdr, NULL);

static void filter_mirror_fini(Object *obj)

diff --git a/qemu-options.hx b/qemu-options.hx

index XXXXXXX..XXXXXXX 100644

--- a/qemu-options.hx

+++ b/qemu-options.hx

@@ -XXX,XX +XXX,XX @@ queue @var{all|rx|tx} is an option that can be applied to any netfilter.

filter-mirror on netdev @var{netdevid},mirror net packet to chardev@var{chardevid}, if it has the vnet_hdr_support flag, filter-mirror will mirror packet with vnet_hdr_len.

-@item -object filter-redirector,id=@var{id},netdev=@var{netdevid},indev=@var{chardevid},

-outdev=@var{chardevid}[,queue=@var{all|rx|tx}]

+@item -object filter-redirector,id=@var{id},netdev=@var{netdevid},indev=@var{chardevid},outdev=@var{chardevid},queue=@var{all|rx|tx}[,vnet_hdr_support]

filter-redirector on netdev @var{netdevid},redirect filter's net packet to chardev

-@var{chardevid},and redirect indev's packet to filter.

+@var{chardevid},and redirect indev's packet to filter.if it has the vnet_hdr_support flag,

+filter-redirector will redirect packet with vnet_hdr_len.

Create a filter-redirector we need to differ outdev id from indev id, id can not

be the same. we can just use indev or outdev, but at least one of indev or outdev

need to be specified.

From: Zhang Chen <zhangchen.fnst@cn.fujitsu.com>

COLO-Proxy just focus on packet payload, so we skip vnet header.

Signed-off-by: Zhang Chen <zhangchen.fnst@cn.fujitsu.com>

net/colo-compare.c | 8 ++++++--

1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/net/colo-compare.c b/net/colo-compare.c

--- a/net/colo-compare.c

+++ b/net/colo-compare.c

@@ -XXX,XX +XXX,XX @@ static int colo_packet_compare_common(Packet *ppkt, Packet *spkt, int offset)

sec_ip_src, sec_ip_dst);

+ offset = ppkt->vnet_hdr_len + offset;

+

if (ppkt->size == spkt->size) {

- return memcmp(ppkt->data + offset, spkt->data + offset,

+ return memcmp(ppkt->data + offset,

+ spkt->data + offset,

spkt->size - offset);

} else {

trace_colo_compare_main("Net packet size are not the same");

@@ -XXX,XX +XXX,XX @@ static int colo_packet_compare_tcp(Packet *spkt, Packet *ppkt)

*/

if (ptcp->th_off > 5) {

ptrdiff_t tcp_offset;

+

tcp_offset = ppkt->transport_header - (uint8_t *)ppkt->data

- + (ptcp->th_off * 4);

+ + (ptcp->th_off * 4) - ppkt->vnet_hdr_len;

res = colo_packet_compare_common(ppkt, spkt, tcp_offset);

} else if (ptcp->th_sum == stcp->th_sum) {

res = colo_packet_compare_common(ppkt, spkt, ETH_HLEN);

From: Zhang Chen <zhangchen.fnst@cn.fujitsu.com>

This patch change the filter_send() parameter from CharBackend to MirrorState,

we can get more information like vnet_hdr(We use it to support packet with vnet_header).

Signed-off-by: Zhang Chen <zhangchen.fnst@cn.fujitsu.com>

net/filter-mirror.c | 10 +++++-----

1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/net/filter-mirror.c b/net/filter-mirror.c

--- a/net/filter-mirror.c

+++ b/net/filter-mirror.c

@@ -XXX,XX +XXX,XX @@ typedef struct MirrorState {

SocketReadState rs;

} MirrorState;

-static int filter_send(CharBackend *chr_out,

+static int filter_send(MirrorState *s,

const struct iovec *iov,

int iovcnt)

{

@@ -XXX,XX +XXX,XX @@ static int filter_send(CharBackend *chr_out,

len = htonl(size);

- ret = qemu_chr_fe_write_all(chr_out, (uint8_t *)&len, sizeof(len));

+ ret = qemu_chr_fe_write_all(&s->chr_out, (uint8_t *)&len, sizeof(len));

if (ret != sizeof(len)) {

goto err;

buf = g_malloc(size);

iov_to_buf(iov, iovcnt, 0, buf, size);

- ret = qemu_chr_fe_write_all(chr_out, (uint8_t *)buf, size);

+ ret = qemu_chr_fe_write_all(&s->chr_out, (uint8_t *)buf, size);

g_free(buf);

if (ret != size) {

goto err;

@@ -XXX,XX +XXX,XX @@ static ssize_t filter_mirror_receive_iov(NetFilterState *nf,

MirrorState *s = FILTER_MIRROR(nf);

int ret;

- ret = filter_send(&s->chr_out, iov, iovcnt);

+ ret = filter_send(s, iov, iovcnt);

if (ret) {

error_report("filter mirror send failed(%s)", strerror(-ret));

}

@@ -XXX,XX +XXX,XX @@ static ssize_t filter_redirector_receive_iov(NetFilterState *nf,

int ret;

if (qemu_chr_fe_backend_connected(&s->chr_out)) {

- ret = filter_send(&s->chr_out, iov, iovcnt);

+ ret = filter_send(s, iov, iovcnt);

if (ret) {

error_report("filter redirector send failed(%s)", strerror(-ret));

}

Spec said offloads should be le64, so use virtio_ldq_p() to guarantee

valid endian.

Fixes: 644c98587d4c ("virtio-net: dynamic network offloads configuration")

Cc: qemu-stable@nongnu.org

Cc: Dmitry Fleytman <dfleytma@redhat.com>

hw/net/virtio-net.c | 2 ++

1 file changed, 2 insertions(+)

diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c

--- a/hw/net/virtio-net.c

+++ b/hw/net/virtio-net.c

@@ -XXX,XX +XXX,XX @@ static int virtio_net_handle_offloads(VirtIONet *n, uint8_t cmd,

if (cmd == VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET) {

uint64_t supported_offloads;

+ offloads = virtio_ldq_p(vdev, &offloads);

+

if (!n->has_vnet_hdr) {

return VIRTIO_NET_ERR;

From: Zhang Chen <zhangchen.fnst@cn.fujitsu.com>

We can use this property flush and send packet with vnet_hdr_len.

Signed-off-by: Zhang Chen <zhangchen.fnst@cn.fujitsu.com>

net/colo-compare.c | 8 ++++++--

net/colo.c | 3 ++-

net/colo.h | 4 +++-

net/filter-rewriter.c | 2 +-

4 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/net/colo-compare.c b/net/colo-compare.c

--- a/net/colo-compare.c

+++ b/net/colo-compare.c

@@ -XXX,XX +XXX,XX @@ static int packet_enqueue(CompareState *s, int mode)

Connection *conn;

if (mode == PRIMARY_IN) {

- pkt = packet_new(s->pri_rs.buf, s->pri_rs.packet_len);

+ pkt = packet_new(s->pri_rs.buf,

+ s->pri_rs.packet_len,

+ s->pri_rs.vnet_hdr_len);

} else {

- pkt = packet_new(s->sec_rs.buf, s->sec_rs.packet_len);

+ pkt = packet_new(s->sec_rs.buf,

+ s->sec_rs.packet_len,

+ s->sec_rs.vnet_hdr_len);

}

if (parse_packet_early(pkt)) {

diff --git a/net/colo.c b/net/colo.c

index XXXXXXX..XXXXXXX 100644

--- a/net/colo.c

+++ b/net/colo.c

@@ -XXX,XX +XXX,XX @@ void connection_destroy(void *opaque)

g_slice_free(Connection, conn);

-Packet *packet_new(const void *data, int size)

+Packet *packet_new(const void *data, int size, int vnet_hdr_len)

{

Packet *pkt = g_slice_new(Packet);

pkt->data = g_memdup(data, size);

pkt->size = size;

pkt->creation_ms = qemu_clock_get_ms(QEMU_CLOCK_HOST);

+ pkt->vnet_hdr_len = vnet_hdr_len;

return pkt;

}

diff --git a/net/colo.h b/net/colo.h

index XXXXXXX..XXXXXXX 100644

--- a/net/colo.h

+++ b/net/colo.h

@@ -XXX,XX +XXX,XX @@ typedef struct Packet {

int size;

/* Time of packet creation, in wall clock ms */

int64_t creation_ms;

+ /* Get vnet_hdr_len from filter */

+ uint32_t vnet_hdr_len;

} Packet;

typedef struct ConnectionKey {

@@ -XXX,XX +XXX,XX @@ Connection *connection_get(GHashTable *connection_track_table,

ConnectionKey *key,

GQueue *conn_list);

void connection_hashtable_reset(GHashTable *connection_track_table);

-Packet *packet_new(const void *data, int size);

+Packet *packet_new(const void *data, int size, int vnet_hdr_len);

void packet_destroy(void *opaque, void *user_data);

#endif /* QEMU_COLO_PROXY_H */

diff --git a/net/filter-rewriter.c b/net/filter-rewriter.c

index XXXXXXX..XXXXXXX 100644

--- a/net/filter-rewriter.c

+++ b/net/filter-rewriter.c

@@ -XXX,XX +XXX,XX @@ static ssize_t colo_rewriter_receive_iov(NetFilterState *nf,

char *buf = g_malloc0(size);

iov_to_buf(iov, iovcnt, 0, buf, size);

- pkt = packet_new(buf, size);

+ pkt = packet_new(buf, size, 0);

g_free(buf);

/*

From: Michal Privoznik <mprivozn@redhat.com>

We have a function that checks if given number is power of two.

We should prefer it instead of expanding the check on our own.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>

hw/net/virtio-net.c | 2 +-

1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c

--- a/hw/net/virtio-net.c

+++ b/hw/net/virtio-net.c

@@ -XXX,XX +XXX,XX @@ static void virtio_net_device_realize(DeviceState *dev, Error **errp)

*/

if (n->net_conf.rx_queue_size < VIRTIO_NET_RX_QUEUE_MIN_SIZE ||

n->net_conf.rx_queue_size > VIRTQUEUE_MAX_SIZE ||

- (n->net_conf.rx_queue_size & (n->net_conf.rx_queue_size - 1))) {

+ !is_power_of_2(n->net_conf.rx_queue_size)) {

error_setg(errp, "Invalid rx_queue_size (= %" PRIu16 "), "

"must be a power of 2 between %d and %d.",

n->net_conf.rx_queue_size, VIRTIO_NET_RX_QUEUE_MIN_SIZE,

From: Zhang Chen <zhangchen.fnst@cn.fujitsu.com>

We add a flag to decide whether net_fill_rstate() need read

the vnet_hdr_len or not.

Signed-off-by: Zhang Chen <zhangchen.fnst@cn.fujitsu.com>

Suggested-by: Jason Wang <jasowang@redhat.com>

include/net/net.h | 9 +++++++--

net/colo-compare.c | 4 ++--

net/filter-mirror.c | 2 +-

net/net.c | 36 ++++++++++++++++++++++++++++++++----

net/socket.c | 8 ++++----

5 files changed, 46 insertions(+), 13 deletions(-)

@@ -XXX,XX +XXX,XX @@ typedef struct NICState {

} NICState;

struct SocketReadState {

- int state; /* 0 = getting length, 1 = getting data */

+ /* 0 = getting length, 1 = getting vnet header length, 2 = getting data */

+ int state;

+ /* This flag decide whether to read the vnet_hdr_len field */

+ bool vnet_hdr;

uint32_t index;

uint32_t packet_len;

+ uint32_t vnet_hdr_len;

uint8_t buf[NET_BUFSIZE];

SocketReadStateFinalize *finalize;

};

@@ -XXX,XX +XXX,XX @@ ssize_t qemu_deliver_packet_iov(NetClientState *sender,

void print_net_client(Monitor *mon, NetClientState *nc);

void hmp_info_network(Monitor *mon, const QDict *qdict);

void net_socket_rs_init(SocketReadState *rs,

- SocketReadStateFinalize *finalize);

+ SocketReadStateFinalize *finalize,

+ bool vnet_hdr);

/* NIC info */

diff --git a/net/colo-compare.c b/net/colo-compare.c

index XXXXXXX..XXXXXXX 100644

--- a/net/colo-compare.c

+++ b/net/colo-compare.c

@@ -XXX,XX +XXX,XX @@ static void colo_compare_complete(UserCreatable *uc, Error **errp)

return;

}

- net_socket_rs_init(&s->pri_rs, compare_pri_rs_finalize);

- net_socket_rs_init(&s->sec_rs, compare_sec_rs_finalize);

+ net_socket_rs_init(&s->pri_rs, compare_pri_rs_finalize, false);

+ net_socket_rs_init(&s->sec_rs, compare_sec_rs_finalize, false);

g_queue_init(&s->conn_list);

diff --git a/net/filter-mirror.c b/net/filter-mirror.c

index XXXXXXX..XXXXXXX 100644

--- a/net/filter-mirror.c

+++ b/net/filter-mirror.c

@@ -XXX,XX +XXX,XX @@ static void filter_redirector_setup(NetFilterState *nf, Error **errp)

}

}

- net_socket_rs_init(&s->rs, redirector_rs_finalize);

+ net_socket_rs_init(&s->rs, redirector_rs_finalize, false);

if (s->indev) {

chr = qemu_chr_find(s->indev);

diff --git a/net/net.c b/net/net.c

index XXXXXXX..XXXXXXX 100644

--- a/net/net.c

+++ b/net/net.c

@@ -XXX,XX +XXX,XX @@ QemuOptsList qemu_net_opts = {

};

void net_socket_rs_init(SocketReadState *rs,

- SocketReadStateFinalize *finalize)

+ SocketReadStateFinalize *finalize,

+ bool vnet_hdr)

{

rs->state = 0;

+ rs->vnet_hdr = vnet_hdr;

rs->index = 0;

rs->packet_len = 0;

+ rs->vnet_hdr_len = 0;

memset(rs->buf, 0, sizeof(rs->buf));

rs->finalize = finalize;

}

@@ -XXX,XX +XXX,XX @@ int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size)

unsigned int l;

while (size > 0) {

- /* reassemble a packet from the network */

- switch (rs->state) { /* 0 = getting length, 1 = getting data */

+ /* Reassemble a packet from the network.

+ * 0 = getting length.

+ * 1 = getting vnet header length.

+ * 2 = getting data.

+ */

+ switch (rs->state) {

case 0:

l = 4 - rs->index;

if (l > size) {

@@ -XXX,XX +XXX,XX @@ int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size)

/* got length */

rs->packet_len = ntohl(*(uint32_t *)rs->buf);

rs->index = 0;

- rs->state = 1;

+ if (rs->vnet_hdr) {

+ rs->state = 1;

+ } else {

+ rs->state = 2;

+ rs->vnet_hdr_len = 0;

+ }

}

break;

case 1:

+ l = 4 - rs->index;

+ if (l > size) {

+ l = size;

+ }

+ memcpy(rs->buf + rs->index, buf, l);

+ buf += l;

+ size -= l;

+ rs->index += l;

+ if (rs->index == 4) {

+ /* got vnet header length */

+ rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf);

+ rs->index = 0;

+ rs->state = 2;

+ }

+ break;

+ case 2:

l = rs->packet_len - rs->index;

if (l > size) {

l = size;

diff --git a/net/socket.c b/net/socket.c

index XXXXXXX..XXXXXXX 100644

--- a/net/socket.c

+++ b/net/socket.c

@@ -XXX,XX +XXX,XX @@ static void net_socket_send(void *opaque)

closesocket(s->fd);

s->fd = -1;

- net_socket_rs_init(&s->rs, net_socket_rs_finalize);

+ net_socket_rs_init(&s->rs, net_socket_rs_finalize, false);

s->nc.link_down = true;

memset(s->nc.info_str, 0, sizeof(s->nc.info_str));

@@ -XXX,XX +XXX,XX @@ static NetSocketState *net_socket_fd_init_dgram(NetClientState *peer,

s->fd = fd;

s->listen_fd = -1;

s->send_fn = net_socket_send_dgram;

- net_socket_rs_init(&s->rs, net_socket_rs_finalize);

+ net_socket_rs_init(&s->rs, net_socket_rs_finalize, false);

net_socket_read_poll(s, true);

/* mcast: save bound address as dst */

@@ -XXX,XX +XXX,XX @@ static NetSocketState *net_socket_fd_init_stream(NetClientState *peer,

s->fd = fd;

s->listen_fd = -1;

- net_socket_rs_init(&s->rs, net_socket_rs_finalize);

+ net_socket_rs_init(&s->rs, net_socket_rs_finalize, false);

/* Disable Nagle algorithm on TCP sockets to reduce latency */

socket_set_nodelay(fd);

@@ -XXX,XX +XXX,XX @@ static int net_socket_listen_init(NetClientState *peer,

s->fd = -1;

s->listen_fd = fd;

s->nc.link_down = true;

- net_socket_rs_init(&s->rs, net_socket_rs_finalize);

+ net_socket_rs_init(&s->rs, net_socket_rs_finalize, false);

qemu_set_fd_handler(s->listen_fd, net_socket_accept, NULL, s);

return 0;

From: Zhang Chen <zhangchen.fnst@cn.fujitsu.com>

Signed-off-by: Zhang Chen <zhangchen.fnst@cn.fujitsu.com>

docs/colo-proxy.txt | 26 ++++++++++++++++++++++++++

1 file changed, 26 insertions(+)

diff --git a/docs/colo-proxy.txt b/docs/colo-proxy.txt

--- a/docs/colo-proxy.txt

+++ b/docs/colo-proxy.txt

@@ -XXX,XX +XXX,XX @@ Secondary(ip:3.3.3.8):

-chardev socket,id=red1,host=3.3.3.3,port=9004

-object filter-redirector,id=f1,netdev=hn0,queue=tx,indev=red0

-object filter-redirector,id=f2,netdev=hn0,queue=rx,outdev=red1

+-object filter-rewriter,id=f3,netdev=hn0,queue=all

+If you want to use virtio-net-pci or other driver with vnet_header:

+

+Primary(ip:3.3.3.3):

+-netdev tap,id=hn0,vhost=off,script=/etc/qemu-ifup,downscript=/etc/qemu-ifdown

+-device e1000,id=e0,netdev=hn0,mac=52:a4:00:12:78:66

+-chardev socket,id=mirror0,host=3.3.3.3,port=9003,server,nowait

+-chardev socket,id=compare1,host=3.3.3.3,port=9004,server,nowait

+-chardev socket,id=compare0,host=3.3.3.3,port=9001,server,nowait

+-chardev socket,id=compare0-0,host=3.3.3.3,port=9001

+-chardev socket,id=compare_out,host=3.3.3.3,port=9005,server,nowait

+-chardev socket,id=compare_out0,host=3.3.3.3,port=9005

+-object filter-mirror,id=m0,netdev=hn0,queue=tx,outdev=mirror0,vnet_hdr_support

+-object filter-redirector,netdev=hn0,id=redire0,queue=rx,indev=compare_out,vnet_hdr_support

+-object filter-redirector,netdev=hn0,id=redire1,queue=rx,outdev=compare0,vnet_hdr_support

+-object colo-compare,id=comp0,primary_in=compare0-0,secondary_in=compare1,outdev=compare_out0,vnet_hdr_support

+

+Secondary(ip:3.3.3.8):

+-netdev tap,id=hn0,vhost=off,script=/etc/qemu-ifup,down script=/etc/qemu-ifdown

+-device e1000,netdev=hn0,mac=52:a4:00:12:78:66

+-chardev socket,id=red0,host=3.3.3.3,port=9003

+-chardev socket,id=red1,host=3.3.3.3,port=9004

+-object filter-redirector,id=f1,netdev=hn0,queue=tx,indev=red0,vnet_hdr_support

+-object filter-redirector,id=f2,netdev=hn0,queue=rx,outdev=red1,vnet_hdr_support

+-object filter-rewriter,id=f3,netdev=hn0,queue=all,vnet_hdr_support

Note:

a.COLO-proxy must work with COLO-frame and Block-replication.

From: Zhang Chen <zhangchen.fnst@cn.fujitsu.com>

We add the vnet_hdr_support option for colo-compare, default is disabled.

If you use virtio-net-pci or other driver needs vnet_hdr, please enable it.

You can use it for example:

-object colo-compare,id=comp0,primary_in=compare0-0,secondary_in=compare1,outdev=compare_out0,vnet_hdr_support

COLO-compare can get vnet header length from filter,

Add vnet_hdr_len to struct packet and output packet with

the vnet_hdr_len.

Signed-off-by: Zhang Chen <zhangchen.fnst@cn.fujitsu.com>