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RE: [PATCH v2] net/colo: check vnet_hdr_support flag when using virtio-n
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From: |
Zhang, Chen |
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Subject: |
RE: [PATCH v2] net/colo: check vnet_hdr_support flag when using virtio-net |
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Date: |
Thu, 9 Sep 2021 13:43:34 +0000 |
> -----Original Message-----
> From: Lukas Straub <lukasstraub2@web.de>
> Sent: Sunday, September 5, 2021 7:48 PM
> To: Zhang, Chen <chen.zhang@intel.com>
> Cc: Xu, Tao3 <tao3.xu@intel.com>; lizhijian@cn.fujitsu.com;
> jasowang@redhat.com; qemu-devel@nongnu.org
> Subject: Re: [PATCH v2] net/colo: check vnet_hdr_support flag when using
> virtio-net
>
> On Thu, 26 Aug 2021 05:49:23 +0000
> "Zhang, Chen" <chen.zhang@intel.com> wrote:
>
> > > -----Original Message-----
> > > From: Lukas Straub <lukasstraub2@web.de>
> > > Sent: Sunday, August 22, 2021 12:25 AM
> > > To: Xu, Tao3 <tao3.xu@intel.com>
> > > Cc: Zhang, Chen <chen.zhang@intel.com>; lizhijian@cn.fujitsu.com;
> > > jasowang@redhat.com; qemu-devel@nongnu.org
> > > Subject: Re: [PATCH v2] net/colo: check vnet_hdr_support flag when
> > > using virtio-net
> > >
> > > On Thu, 19 Aug 2021 09:27:17 +0800
> > > Tao Xu <tao3.xu@intel.com> wrote:
> > >
> > > > When COLO use only one vnet_hdr_support parameter between COLO
> > > network
> > > > filter(filter-mirror, filter-redirector or filter-rewriter and
> > > > colo-compare, packet will not be parsed correctly. Acquire network
> > > > driver related to COLO, if it is nirtio-net, check
> > > > vnet_hdr_support flag of COLO network filter and colo-compare.
> > > >
> > > > Signed-off-by: Tao Xu <tao3.xu@intel.com>
> > > > Signed-off-by: Zhang Chen <chen.zhang@intel.com>
> > > > ---
> > > >
> > > > Changelog:
> > > > v2:
> > > > Detect virtio-net driver and apply vnet_hdr_support
> > > > automatically. (Jason)
> > > > ---
> > > > net/colo-compare.c | 57
> > > +++++++++++++++++++++++++++++++++++++++++++
> > > > net/colo.c | 20 +++++++++++++++
> > > > net/colo.h | 4 +++
> > > > net/filter-mirror.c | 21 ++++++++++++++++
> > > > net/filter-rewriter.c | 10 ++++++++
> > > > qapi/qom.json | 6 +++++
> > > > qemu-options.hx | 6 +++--
> > > > 7 files changed, 122 insertions(+), 2 deletions(-)
> > > >
> > > > diff --git a/net/colo-compare.c b/net/colo-compare.c index
> > > > b100e7b51f..870bd05a41 100644
> > > > --- a/net/colo-compare.c
> > > > +++ b/net/colo-compare.c
> > > > @@ -110,6 +110,7 @@ struct CompareState {
> > > > char *sec_indev;
> > > > char *outdev;
> > > > char *notify_dev;
> > > > + char *netdev;
> > > > CharBackend chr_pri_in;
> > > > CharBackend chr_sec_in;
> > > > CharBackend chr_out;
> > > > @@ -838,6 +839,28 @@ static int compare_chr_can_read(void *opaque)
> > > > return COMPARE_READ_LEN_MAX;
> > > > }
> > > >
> > > > +static int colo_set_default_netdev(void *opaque, QemuOpts *opts,
> > > > +Error **errp) {
> > > > + const char *colo_obj_type, *netdev_from_filter;
> > > > + char **netdev = (char **)opaque;
> > > > +
> > > > + colo_obj_type = qemu_opt_get(opts, "qom-type");
> > > > +
> > > > + if (colo_obj_type &&
> > > > + (strcmp(colo_obj_type, "filter-mirror") == 0 ||
> > > > + strcmp(colo_obj_type, "filter-redirector") == 0 ||
> > > > + strcmp(colo_obj_type, "filter-rewriter") == 0)) {
> > > > + netdev_from_filter = qemu_opt_get(opts, "netdev");
> > > > + if (*netdev == NULL) {
> > > > + *netdev = g_strdup(netdev_from_filter);
> > > > + } else if (strcmp(*netdev, netdev_from_filter) != 0) {
> > > > + warn_report("%s is using a different netdev from other
> > > > COLO "
> > > > + "component", colo_obj_type);
> > > > + }
> > > > + }
> > > > + return 0;
> > > > +}
> > > > +
> > >
> > > Hi,
> > > This doesn't properly handle the case where there are multiple
> > > network devices and one is virtio-net and the other isn't. This
> > > would be a regression as this worked fine before.
> >
> > No, If have multiple network device this patch just report a warning for it.
> > You can still use virtio-net and others at the same time.
>
> As you see it sets netdev to the first filter's netdev. So if the first
> netdev is
> virtio-net and the 2nd is e1000 (for example) it'll see virtio-net first and
> set
> *netdev to it for _both_ devices. Then it sees the e1000 and prints the
> warning, but *netdev is still set to virtio-net. So it'll enable vnet_hdr for
> e1000 too and segfault when processing a packet because e1000 doesn't
> support vnet_hdr.
Hi Lukas,
Thanks your review~ This patch just focus on colo-compare and net-filter's
vnet_hdr flag, not related to real netdev's flag (like e1000 vnet_hdr).
So, we can't setup the vnet_hdr to e1000 at any time.
Back to this question, If the first filter's netdev is virtio-net, we will
set the "*netdev" in colo-compare module,
As we know, The colo-compare module won't really attach to any netdev, the
"*netdev" just a flag to show we have a related filter used virtio-net.
We'd better to enable other filter's flag to make all colo-proxy works. And the
filter module with e1000, we haven't enough information to repair.
Thanks
Chen
>
> > >
> > > > /*
> > > > * Called from the main thread on the primary for packets
> > > > * arriving over the socket from the primary.
> > > > @@ -1050,6 +1073,21 @@ static void compare_set_vnet_hdr(Object
> *obj,
> > > > s->vnet_hdr = value;
> > > > }
> > > >
> > > > +static char *compare_get_netdev(Object *obj, Error **errp) {
> > > > + CompareState *s = COLO_COMPARE(obj);
> > > > +
> > > > + return g_strdup(s->netdev);
> > > > +}
> > > > +
> > > > +static void compare_set_netdev(Object *obj, const char *value,
> > > > +Error
> > > > +**errp) {
> > > > + CompareState *s = COLO_COMPARE(obj);
> > > > +
> > > > + g_free(s->netdev);
> > > > + s->netdev = g_strdup(value);
> > > > +}
> > > > +
> > > > static char *compare_get_notify_dev(Object *obj, Error **errp) {
> > > > CompareState *s = COLO_COMPARE(obj); @@ -1274,6 +1312,12 @@
> > > > static void colo_compare_complete(UserCreatable *uc, Error **errp)
> > > > max_queue_size = MAX_QUEUE_SIZE;
> > > > }
> > > >
> > > > + if (!s->netdev) {
> > > > + /* Set default netdev as the first colo netfilter found */
> > > > + qemu_opts_foreach(qemu_find_opts("object"),
> > > > + colo_set_default_netdev, &s->netdev, NULL);
> > > > + }
> > > > +
> > > > if (find_and_check_chardev(&chr, s->pri_indev, errp) ||
> > > > !qemu_chr_fe_init(&s->chr_pri_in, chr, errp)) {
> > > > return;
> > > > @@ -1289,6 +1333,16 @@ static void
> > > colo_compare_complete(UserCreatable *uc, Error **errp)
> > > > return;
> > > > }
> > > >
> > > > + if (!s->vnet_hdr &&
> > > > + qemu_opts_foreach(qemu_find_opts("device"),
> > > > + vnet_driver_check, s->netdev, NULL)) {
> > > > + /*
> > > > + * colo compare needs 'vnet_hdr_support' when it works on
> virtio-net,
> > > > + * add 'vnet_hdr_support' automatically
> > > > + */
> > > > + s->vnet_hdr = true;
> > > > + }
> > > > +
> > >
> > > There is no way to disable vnet_hdr_support with virtio-net now.
> >
> > Yes, It looks no reason to do this.
> > Please show me some details?
> >
> > Thanks
> > Chen
> >
> > >
> > > > net_socket_rs_init(&s->pri_rs, compare_pri_rs_finalize, s-
> >vnet_hdr);
> > > > net_socket_rs_init(&s->sec_rs, compare_sec_rs_finalize,
> > > > s->vnet_hdr);
> > > >
> > > > @@ -1400,6 +1454,9 @@ static void colo_compare_init(Object *obj)
> > > > s->vnet_hdr = false;
> > > > object_property_add_bool(obj, "vnet_hdr_support",
> > > compare_get_vnet_hdr,
> > > > compare_set_vnet_hdr);
> > > > + /* colo compare can't varify that netdev is correct */
> > > > + object_property_add_str(obj, "netdev", compare_get_netdev,
> > > > + compare_set_netdev);
> > > > }
> > > >
> > > > void colo_compare_cleanup(void)
> > > > diff --git a/net/colo.c b/net/colo.c index 3a3e6e89a0..4a03780f45
> > > > 100644
> > > > --- a/net/colo.c
> > > > +++ b/net/colo.c
> > > > @@ -243,3 +243,23 @@ bool connection_has_tracked(GHashTable
> > > > *connection_track_table,
> > > >
> > > > return conn ? true : false;
> > > > }
> > > > +
> > > > +/* check the network driver related to COLO, return 1 if it is
> > > > +virtio-net */ int vnet_driver_check(void *opaque, QemuOpts *opts,
> > > > +Error **errp) {
> > > > + const char *driver_type, *netdev_from_driver;
> > > > + char *netdev_from_filter = (char *)opaque;
> > > > +
> > > > + driver_type = qemu_opt_get(opts, "driver");
> > > > + netdev_from_driver = qemu_opt_get(opts, "netdev");
> > > > +
> > > > + if (!driver_type || !netdev_from_driver || !netdev_from_filter) {
> > > > + return 0;
> > > > + }
> > > > +
> > > > + if (g_str_has_prefix(driver_type, "virtio-net") &&
> > > > + strcmp(netdev_from_driver, netdev_from_filter) == 0) {
> > > > + return 1;
> > > > + }
> > > > + return 0;
> > > > +}
> > > > diff --git a/net/colo.h b/net/colo.h index d91cd245c4..d401fc76b6
> > > > 100644
> > > > --- a/net/colo.h
> > > > +++ b/net/colo.h
> > > > @@ -18,6 +18,9 @@
> > > > #include "qemu/jhash.h"
> > > > #include "qemu/timer.h"
> > > > #include "net/eth.h"
> > > > +#include "qemu/option.h"
> > > > +#include "qemu/option_int.h"
> > > > +#include "qemu/config-file.h"
> > > >
> > > > #define HASHTABLE_MAX_SIZE 16384
> > > >
> > > > @@ -104,5 +107,6 @@ Packet *packet_new(const void *data, int size,
> > > > int vnet_hdr_len); Packet *packet_new_nocopy(void *data, int
> > > > size, int vnet_hdr_len); void packet_destroy(void *opaque, void
> > > > *user_data); void packet_destroy_partial(void *opaque, void
> > > > *user_data);
> > > > +int vnet_driver_check(void *opaque, QemuOpts *opts, Error
> > > > +**errp);
> > > >
> > > > #endif /* NET_COLO_H */
> > > > diff --git a/net/filter-mirror.c b/net/filter-mirror.c index
> > > > f20240cc9f..69ca9c9839 100644
> > > > --- a/net/filter-mirror.c
> > > > +++ b/net/filter-mirror.c
> > > > @@ -12,6 +12,7 @@
> > > > #include "qemu/osdep.h"
> > > > #include "net/filter.h"
> > > > #include "net/net.h"
> > > > +#include "net/colo.h"
> > > > #include "qapi/error.h"
> > > > #include "qom/object.h"
> > > > #include "qemu/main-loop.h"
> > > > @@ -224,6 +225,16 @@ static void
> > > > filter_mirror_setup(NetFilterState *nf,
> > > Error **errp)
> > > > return;
> > > > }
> > > >
> > > > + if (!s->vnet_hdr &&
> > > > + qemu_opts_foreach(qemu_find_opts("device"),
> > > > + vnet_driver_check, nf->netdev_id, NULL)) {
> > > > + /*
> > > > + * filter mirror needs 'vnet_hdr_support' when colo filter
> > > > modules
> > > > + * work on virtio-net, add 'vnet_hdr_support' automatically
> > > > + */
> > > > + s->vnet_hdr = true;
> > > > + }
> > > > +
> > > > qemu_chr_fe_init(&s->chr_out, chr, errp); }
> > > >
> > > > @@ -252,6 +263,16 @@ static void
> > > > filter_redirector_setup(NetFilterState
> > > *nf, Error **errp)
> > > > }
> > > > }
> > > >
> > > > + if (!s->vnet_hdr &&
> > > > + qemu_opts_foreach(qemu_find_opts("device"),
> > > > + vnet_driver_check, nf->netdev_id, NULL)) {
> > > > + /*
> > > > + * filter redirector needs 'vnet_hdr_support' when colo filter
> modules
> > > > + * work on virtio-net, add 'vnet_hdr_support' automatically
> > > > + */
> > > > + s->vnet_hdr = true;
> > > > + }
> > > > +
> > > > net_socket_rs_init(&s->rs, redirector_rs_finalize,
> > > > s->vnet_hdr);
> > > >
> > > > if (s->indev) {
> > > > diff --git a/net/filter-rewriter.c b/net/filter-rewriter.c index
> > > > cb3a96cde1..637ef4ce71 100644
> > > > --- a/net/filter-rewriter.c
> > > > +++ b/net/filter-rewriter.c
> > > > @@ -388,6 +388,16 @@ static void
> > > > colo_rewriter_setup(NetFilterState
> > > > *nf, Error **errp) {
> > > > RewriterState *s = FILTER_REWRITER(nf);
> > > >
> > > > + if (!s->vnet_hdr &&
> > > > + qemu_opts_foreach(qemu_find_opts("device"),
> > > > + vnet_driver_check, nf->netdev_id, NULL)) {
> > > > + /*
> > > > + * filter rewriter needs 'vnet_hdr_support' when colo filter
> modules
> > > > + * work on virtio-net, add 'vnet_hdr_support' automatically
> > > > + */
> > > > + s->vnet_hdr = true;
> > > > + }
> > > > +
> > > > s->connection_track_table =
> > > g_hash_table_new_full(connection_key_hash,
> > > >
> > > > connection_key_equal,
> > > > g_free,
> > > > diff --git a/qapi/qom.json b/qapi/qom.json index
> > > > 6d5f4a88e6..442a963ba4
> > > > 100644
> > > > --- a/qapi/qom.json
> > > > +++ b/qapi/qom.json
> > > > @@ -241,6 +241,11 @@
> > > > # @notify_dev: name of the character device backend to be used to
> > > communicate
> > > > # with the remote colo-frame (only for Xen COLO)
> > > > #
> > > > +# @netdev: id of the network device backend to colo-compare,
> although
> > > > +# colo-compare doesn't depend on network device directly, this
> > > > +# parameter help colo-compare know what network driver it is
> > > > +# working on
> > > > +#
> > > > # @compare_timeout: the maximum time to hold a packet from
> > > @primary_in for
> > > > # comparison with an incoming packet on
> > > > @secondary_in in
> > > > # milliseconds (default: 3000)
> > > > @@ -264,6 +269,7 @@
> > > > 'outdev': 'str',
> > > > 'iothread': 'str',
> > > > '*notify_dev': 'str',
> > > > + '*netdev': 'str',
> > > > '*compare_timeout': 'uint64',
> > > > '*expired_scan_cycle': 'uint32',
> > > > '*max_queue_size': 'uint32', diff --git
> > > > a/qemu-options.hx b/qemu-options.hx index 83aa59a920..b31ce3c87d
> > > > 100644
> > > > --- a/qemu-options.hx
> > > > +++ b/qemu-options.hx
> > > > @@ -4957,12 +4957,14 @@ SRST
> > > > stored. The file format is libpcap, so it can be analyzed with
> > > > tools such as tcpdump or Wireshark.
> > > >
> > > > - ``-object colo-
> > >
> compare,id=id,primary_in=chardevid,secondary_in=chardevid,outdev=cha
> > > rd
> > > evid,iothread=id[,vnet_hdr_support][,notify_dev=id][,compare_timeout
> > > =@
> > >
> var{ms}][,expired_scan_cycle=@var{ms}][,max_queue_size=@var{size}]``
> > > > + ``-object
> > > > + colo-
> > > compare,id=id,primary_in=chardevid,secondary_in=chardevid,outde
> > > > + v=chardevid,iothread=id[,netdev=netdevid][,vnet_hdr_support][,no
> > > > + tify
> > > > +
> > >
> _dev=id][,compare_timeout=@var{ms}][,expired_scan_cycle=@var{ms}][,
> > > m
> > > > + ax_queue_size=@var{size}]``
> > > > Colo-compare gets packet from primary\_in chardevid and
> > > > secondary\_in, then compare whether the payload of primary
> packet
> > > > and secondary packet are the same. If same, it will output
> > > > primary packet to out\_dev, else it will notify COLO-framework
> > > > to
> do
> > > > - checkpoint and send primary packet to out\_dev. In order to
> > > > + checkpoint and send primary packet to out\_dev. Although
> > > > + colo-
> > > compare
> > > > + does not depend on network device directly, netdevid help
> > > > + colo-compare know what network driver it is working on.
> > > > + In order to
> > > > improve efficiency, we need to put the task of comparison in
> > > > another iothread. If it has the vnet\_hdr\_support flag,
> > > > colo compare will send/recv packet with vnet\_hdr\_len.
> > >
> > >
> > >
> > > --
> >
>
>
>
> --