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b=abQNmtBQDthF4OapESc9+/ERCg/5k7s41KnCfX5dsPqBnDS2d+ob1eQLE3XnUTe3A fnJxHJazlS4e0duz3almFawbqVtl5NImu+Bo00cjJNeej0QweiKQVo+HwWHfQT6lDb V+PN+2ZihoBMoR68xJhmip41ZcdbwolfRPdfHCM8= X-UI-Sender-Class: c548c8c5-30a9-4db5-a2e7-cb6cb037b8f9 Received: from gecko.fritz.box ([94.134.180.255]) by smtp.web.de (mrweb105 [213.165.67.124]) with ESMTPSA (Nemesis) id 1MVJRl-1mVOyJ2thn-00SEp0; Sun, 05 Sep 2021 13:48:20 +0200 Date: Sun, 5 Sep 2021 11:48:10 +0000 From: Lukas Straub To: "Zhang, Chen" Subject: Re: [PATCH v2] net/colo: check vnet_hdr_support flag when using virtio-net Message-ID: <20210905114810.0cbb688e@gecko.fritz.box> In-Reply-To: References: <20210819012717.318050-1-tao3.xu@intel.com> <20210821162524.3b112708@gecko.fritz.box> MIME-Version: 1.0 Content-Type: multipart/signed; boundary="Sig_/QVZH6X+GSrq9uV=DM7x8Wfi"; protocol="application/pgp-signature"; micalg=pgp-sha256 X-Provags-ID: V03:K1:vEiaqHuOnfq5aEXDzLTYyS5xovFvhKxL6im12UgSDKu2Iu7D9io QUr/RReNM+uBL0IZ7SM10dbH0XrBjZ6lr0wunaqKwrtFqZrjhxfMIRJidPRG3k1plvTHFQp 1/TCaNcTIYiQpw1aDOk1668OT+1m2iK6QHUgkUWiWfhBxWf9uHtk6ru6Cpq30M2WlrGOm+m mWDHidQdn6xnczjxlc6Vw== X-UI-Out-Filterresults: notjunk:1;V03:K0:Uk9dZkuofyA=:IFFu5aGRXg21/GfGkP6u1E GrA5AbMz0MD3gXhfmXIH62oOFTVt9Xn3ZszIamvBDaZQV2bWTGSJaN5aI9xoKXOa2oBaMACoT mlK9IRZjrSnEBbKcBMEOuKhAdPiiM8z+ctro1ysiluX/uuOxPT0pb0sl736PsssrHYeshKQTH 8qLzrKDZSNaK0R7RE8ojBD/N8+9HbxxiCxp6a2VUzFeCas4gQTaGNTyScEN4HkWw8JHZGbs1T tdB6lJiJ27pbWnQD12qO88LbDzXnHF9Sz/2/boHLRFnfCy6+oAUNTMnaj5PIQSjs3yrv8+Okw HVpA8AaMOxqz3ol/kYdYyIN6Lt+ix8cOi7U+6gpgrUJI8OgkphUQRq3NfvEQQaJHODZ3FewYQ noUE2WhQa1u8b75VtqyzBOgz5Pk4PPqIVAA1CFT+5zG3MwtAcWBTRoMS15LTmf/fCfJcUK6Q9 QLH6miOMZqe2qbRE2F1MRB1jl4yS4goDNmufR27lyOjc3wile4/aXO+UOO7XxYWG9oCYigMW6 ybipgzJo0xpl1qQpEY3rgIEXX3Zgme4fNG+eoer6g4tNxlhq0s+ijgiNXY8HmKrUb/UPHno7X U03V11PvdgyIWS512nyYmKVZcs/V2kDGMy+d/wMNTEnUHXl08WYta8ajMz1ZVDLhLbF1nrok7 FvDPRMV4mW2eJpIJQF7IQcoaWW/xjJNhdeVkWEUhwjlFOszil1PanEpoWjNiDYusDOZe00215 n+HNLt6C+xYbzFI5B2T8pDak0i4XN3cCSL/JmKBCy9oKNLoR+0lP2Jj295/x30ylSlNZVguxE 0fSLsCjBoyGHq7Y6ZD42mO1Yi+DD9BYdTUG7m7GK4sDYSlXH2i6Z0aShDMilcCK5iJaNq8jyU C/FZ6K9GvoFVM1axCG57g+oPRP/460iCfPJ+YbaBOEJUM7Uc1OUEj5ZScYvPt7dM3oPgKzQIB 6n5+uiCHDYT4D/wNghK1jDyiDIuwq7VAAElciHsuJqFsxiqtJWf8av49ZKrDgF1hIt3oZqx0j p9vj638cNwoP4nLwWEOwBTEYSCylx2lX8Ds0alfA8ui4HY3RYJnxxrUPc6mEDRC3tUUwEoAPw S7xUOUosfruQY2UNWc74Vau0SNt6H7dObCz8DQAyt5ogOINbJKmoyqAXw== Received-SPF: pass client-ip=212.227.17.12; envelope-from=lukasstraub2@web.de; helo=mout.web.de X-Spam_score_int: -17 X-Spam_score: -1.8 X-Spam_bar: - X-Spam_report: (-1.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_ENVFROM_END_DIGIT=0.25, FREEMAIL_FROM=0.001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Xu, Tao3" , "jasowang@redhat.com" , "lizhijian@cn.fujitsu.com" , "qemu-devel@nongnu.org" Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" --Sig_/QVZH6X+GSrq9uV=DM7x8Wfi Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable On Thu, 26 Aug 2021 05:49:23 +0000 "Zhang, Chen" wrote: > > -----Original Message----- > > From: Lukas Straub > > Sent: Sunday, August 22, 2021 12:25 AM > > To: Xu, Tao3 > > Cc: Zhang, Chen ; 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 > >=20 > > On Thu, 19 Aug 2021 09:27:17 +0800 > > Tao Xu wrote: > > =20 > > > When COLO use only one vnet_hdr_support parameter between COLO =20 > > network =20 > > > 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 > > > Signed-off-by: Zhang Chen > > > --- > > > > > > Changelog: > > > v2: > > > Detect virtio-net driver and apply vnet_hdr_support > > > automatically. (Jason) > > > --- > > > net/colo-compare.c | 57 =20 > > +++++++++++++++++++++++++++++++++++++++++++ =20 > > > 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 =3D (char **)opaque; > > > + > > > + colo_obj_type =3D qemu_opt_get(opts, "qom-type"); > > > + > > > + if (colo_obj_type && > > > + (strcmp(colo_obj_type, "filter-mirror") =3D=3D 0 || > > > + strcmp(colo_obj_type, "filter-redirector") =3D=3D 0 || > > > + strcmp(colo_obj_type, "filter-rewriter") =3D=3D 0)) { > > > + netdev_from_filter =3D qemu_opt_get(opts, "netdev"); > > > + if (*netdev =3D=3D NULL) { > > > + *netdev =3D g_strdup(netdev_from_filter); > > > + } else if (strcmp(*netdev, netdev_from_filter) !=3D 0) { > > > + warn_report("%s is using a different netdev from other C= OLO " > > > + "component", colo_obj_type); > > > + } > > > + } > > > + return 0; > > > +} > > > + =20 > >=20 > > 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 regr= ession as > > this worked fine before. =20 >=20 > 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. > > =20 > > > /* > > > * 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 =3D value; > > > } > > > > > > +static char *compare_get_netdev(Object *obj, Error **errp) { > > > + CompareState *s =3D COLO_COMPARE(obj); > > > + > > > + return g_strdup(s->netdev); > > > +} > > > + > > > +static void compare_set_netdev(Object *obj, const char *value, Error > > > +**errp) { > > > + CompareState *s =3D COLO_COMPARE(obj); > > > + > > > + g_free(s->netdev); > > > + s->netdev =3D g_strdup(value); > > > +} > > > + > > > static char *compare_get_notify_dev(Object *obj, Error **errp) { > > > CompareState *s =3D COLO_COMPARE(obj); @@ -1274,6 +1312,12 @@ > > > static void colo_compare_complete(UserCreatable *uc, Error **errp) > > > max_queue_size =3D 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 =20 > > colo_compare_complete(UserCreatable *uc, Error **errp) =20 > > > 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 vi= rtio-net, > > > + * add 'vnet_hdr_support' automatically > > > + */ > > > + s->vnet_hdr =3D true; > > > + } > > > + =20 > >=20 > > There is no way to disable vnet_hdr_support with virtio-net now. =20 >=20 > Yes, It looks no reason to do this. > Please show me some details? >=20 > Thanks > Chen >=20 > > =20 > > > 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 =3D false; > > > object_property_add_bool(obj, "vnet_hdr_support", =20 > > compare_get_vnet_hdr, =20 > > > 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 =3D (char *)opaque; > > > + > > > + driver_type =3D qemu_opt_get(opts, "driver"); > > > + netdev_from_driver =3D 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) =3D=3D 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, =20 > > Error **errp) =20 > > > 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 m= odules > > > + * work on virtio-net, add 'vnet_hdr_support' automatically > > > + */ > > > + s->vnet_hdr =3D true; > > > + } > > > + > > > qemu_chr_fe_init(&s->chr_out, chr, errp); } > > > > > > @@ -252,6 +263,16 @@ static void filter_redirector_setup(NetFilterSta= te =20 > > *nf, Error **errp) =20 > > > } > > > } > > > > > > + 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 filt= er modules > > > + * work on virtio-net, add 'vnet_hdr_support' automatically > > > + */ > > > + s->vnet_hdr =3D 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 =3D 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 =3D true; > > > + } > > > + > > > s->connection_track_table =3D =20 > > g_hash_table_new_full(connection_key_hash, =20 > > > 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 =20 > > communicate =20 > > > # 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, t= his > > > +# parameter help colo-compare know what network driver it is > > > +# working on > > > +# > > > # @compare_timeout: the maximum time to hold a packet from =20 > > @primary_in for =20 > > > # 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 wi= th > > > tools such as tcpdump or Wireshark. > > > > > > - ``-object colo- =20 > > compare,id=3Did,primary_in=3Dchardevid,secondary_in=3Dchardevid,outdev= =3Dchard > > evid,iothread=3Did[,vnet_hdr_support][,notify_dev=3Did][,compare_timeou= t=3D@ > > var{ms}][,expired_scan_cycle=3D@var{ms}][,max_queue_size=3D@var{size}]`= ` =20 > > > + ``-object > > > + colo- =20 > > compare,id=3Did,primary_in=3Dchardevid,secondary_in=3Dchardevid,outde = =20 > > > + v=3Dchardevid,iothread=3Did[,netdev=3Dnetdevid][,vnet_hdr_support][= ,notify > > > + =20 > > _dev=3Did][,compare_timeout=3D@var{ms}][,expired_scan_cycle=3D@var{ms}]= [, > > m =20 > > > + ax_queue_size=3D@var{size}]`` > > > Colo-compare gets packet from primary\_in chardevid and > > > secondary\_in, then compare whether the payload of primary p= acket > > > and secondary packet are the same. If same, it will output > > > primary packet to out\_dev, else it will notify COLO-framewo= rk to do > > > - checkpoint and send primary packet to out\_dev. In order to > > > + checkpoint and send primary packet to out\_dev. Although col= o- =20 > > compare =20 > > > + 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. =20 > >=20 > >=20 > >=20 > > -- =20 >=20 --=20 --Sig_/QVZH6X+GSrq9uV=DM7x8Wfi Content-Type: application/pgp-signature Content-Description: OpenPGP digital signature -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEEg/qxWKDZuPtyYo+kNasLKJxdslgFAmE0rnoACgkQNasLKJxd sligiw//RUMknPtVStEkn9PfB6KubAGWPpgA+SRLJ/9qIdDzXm1PSi/+CNijlaMr CG8Ar19K9x6VGXsalpDgGct+F6+VcV8znI/rFM2Sk9Yc241W1wPr1MN52bpTzyAt W5ZX/pqtDOvef21u8Quh2NtgA0dK7tMOcLpe+C9OKtOHyxijQ0q+8pjyXV2TTazf m3l3KiikK5cxK0JSLR2ttiwqIitVgBHN962DLNA758qDxlccqIB1Gqqv7TbSPW2f CpwAx7o9iK1hA7i85Ys9ZbukL9rUoCGIP6KHlebbjTuHyv8vtrZ6B60CKmlesqGy iY3oBfM+u5e/wvz2RGI7sCWRVOZr/NtxXB4tlvMSh/vkY+UCleqJKQwu9dGBe1Id GCMBAaepks2ze3ccnuQBOqtZXejs5fBeGJx+67F/uaO1flqrU+QEfJwQD6bQW2k3 tVn1coAXJezY5gk/JUaUEbd8MXd51nUS7mYmOqLLXJYcLW1RTK9JQCRymsnnRW8I Hkj3Xtv/6Fua1fJ2+2TTrQQeY0BgyGMB5Y7ciAZwnup3ZGAveMn+9BGvIPIixTY/ hrhOx+LEOX2hHZD1/hcd2dM6KlU49trFZs2zCvWsKhsFTxwqJhyfXKx+OfoPa3H2 ifY2IF686/+i9F7J0h9oikQXJFWLJyOMrw+kMTHllVKZc/cuAeg= =utUz -----END PGP SIGNATURE----- --Sig_/QVZH6X+GSrq9uV=DM7x8Wfi--