[libvirt] [PATCH] Add support for 'passthru' mode for direct network interfaces
Eric Blake
eblake at redhat.com
Wed May 18 02:19:17 UTC 2011
On 05/17/2011 05:26 AM, D. Herrendoerfer wrote:
> This patch includes the documentation part.
>
> The error returned by libvirt when a using an older kernel
> is imho sufficient to point to the macvtap setup. Apart from that
> I doubt that someone will use this feature by chance. But still - I
> believe the error returned is detailed enough for now.
Fair enough for me.
Your patch came through rather mangled by your mailer; sometimes, it is
worth sending a patch to yourself as a trial run to see if others would
have a hard time running 'git am' on the resulting email, then figure
out how to tune 'git send-email' to do what you wanted for sending the
patch. The git mailing list or IRC channel is a good resource for
figuring out configuration emails that make patch submission easier.
>
> Signed-off-by: Dirk Herrendoerfer <d.herrendoerfer at herrendoerfer.name>
>
> diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
> index 989dcf6..3f6bec8 100644
> --- a/docs/formatdomain.html.in
> +++ b/docs/formatdomain.html.in
> @@ -1429,6 +1429,12 @@
> external router or gateway and that device sends them back to the
> host. This procedure is followed if either the source or destination
> device is in <code>private</code> mode.</dd>
> + <dt><code>passthru</code></dt>
> + <dd>This feature allows to attach a virtual function of a SRIOV
> capable
s/allows to attach/attaches/
> + NIC directly to a VM without loosing the migration capability.
s/loosing/losing/
> + All packets are sent to the VF/IF of the configured network device.
> + Depending on the capabilities of the device additional
> prerequisites or
> + limitations may apply. <span class="since">(Since Linux
> 2.6.38.)</span></dd>
Here's where part of the patch botching showed up. Also, when possible,
we like to keep lines within 80 columns.
The <span class="since"> annotations are for when a feature was added to
libvirt (0.9.2 in this case), not when it was added elsewhere.
> </dl>
>
> <pre>
> diff --git a/docs/schemas/domain.rng b/docs/schemas/domain.rng
> index 7163c6e..e2a66ae 100644
> --- a/docs/schemas/domain.rng
> +++ b/docs/schemas/domain.rng
> @@ -2351,7 +2351,7 @@
> </define>
> <define name="bridgeMode">
> <data type="string">
> - <param name="pattern">(vepa|bridge|private)</param>
> + <param name="pattern">(vepa|bridge|private|passthru)</param>
We already have other cases of "passthrough" in our XML schema; let's be
consistent and avoid abbreviations in the public interface.
> </data>
> </define>
> <define name="addrMAC">
> diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
> index d3efec6..4c4bfad 100644
> --- a/src/conf/domain_conf.c
> +++ b/src/conf/domain_conf.c
> @@ -383,7 +383,8 @@ VIR_ENUM_IMPL(virDomainSeclabel,
> VIR_DOMAIN_SECLABEL_LAST,
> VIR_ENUM_IMPL(virDomainNetdevMacvtap, VIR_DOMAIN_NETDEV_MACVTAP_MODE_LAST,
> "vepa",
> "private",
> - "bridge")
> + "bridge",
> + "passthru" )
Odd spacing, and same spelling issue.
>
> VIR_ENUM_IMPL(virVirtualPort, VIR_VIRTUALPORT_TYPE_LAST,
> "none",
> diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
> index a0f820c..70943f9 100644
> --- a/src/conf/domain_conf.h
> +++ b/src/conf/domain_conf.h
> @@ -335,6 +335,7 @@ enum virDomainNetdevMacvtapType {
> VIR_DOMAIN_NETDEV_MACVTAP_MODE_VEPA,
> VIR_DOMAIN_NETDEV_MACVTAP_MODE_PRIVATE,
> VIR_DOMAIN_NETDEV_MACVTAP_MODE_BRIDGE,
> + VIR_DOMAIN_NETDEV_MACVTAP_MODE_PASSTHRU,
But here, the abbreviation is fine (it's internal to the code).
>
> VIR_DOMAIN_NETDEV_MACVTAP_MODE_LAST,
> };
> diff --git a/src/util/macvtap.c b/src/util/macvtap.c
> index a7af0cb..1b274cc 100644
> --- a/src/util/macvtap.c
> +++ b/src/util/macvtap.c
> @@ -473,6 +473,9 @@ macvtapModeFromInt(enum virDomainNetdevMacvtapType
> mode)
> case VIR_DOMAIN_NETDEV_MACVTAP_MODE_BRIDGE:
> return MACVLAN_MODE_BRIDGE;
>
> + case VIR_DOMAIN_NETDEV_MACVTAP_MODE_PASSTHRU:
> + return MACVLAN_MODE_PASSTHRU;
This fails to compile for me on kernel-2.6.35.13-91.fc14.x86_64, but I
see on rawhide that this is 8, so we need a #define fallback value.
Shoot, in rawhide, it's an enum rather than a #define, so we need a
configure check rather than a simpler preprocessor check.
This is what I'll probably push.
From f977a09221757826ee91dd966e8d726b0bc22501 Mon Sep 17 00:00:00 2001
From: Dirk Herrendorefer <d.herrendoerfer at herrendoerfer.name>
Date: Tue, 17 May 2011 13:26:09 +0200
Subject: [PATCH] Add support for 'passthru' mode for direct network
interfaces
starting with kernel 2.6.38 macvtap supports a 'passthru' mode for
attaching virtual functions of a SRIOV capable network card directly to
a VM.
This patch adds the capability to configure such a device.
Signed-off-by: Dirk Herrendoerfer <d.herrendoerfer at herrendoerfer.name>
---
AUTHORS | 1 +
configure.ac | 7 +++++++
docs/formatdomain.html.in | 7 +++++++
docs/schemas/domain.rng | 2 +-
src/conf/domain_conf.c | 3 ++-
src/conf/domain_conf.h | 1 +
src/util/macvtap.c | 12 ++++++++++--
src/util/macvtap.h | 1 +
8 files changed, 30 insertions(+), 4 deletions(-)
diff --git a/AUTHORS b/AUTHORS
index 1bb1f0f..a1e93db 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -170,6 +170,7 @@ Patches have also been contributed by:
index 233e4af..8db3226 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2240,6 +2240,13 @@ if test "$with_macvtap" != "no" ; then
fi
AM_CONDITIONAL([WITH_MACVTAP], [test "$with_macvtap" = "yes"])
AC_MSG_RESULT([$with_macvtap])
+if test "$with_macvtap" = yes; then
+ AC_CHECK_DECLS([MACVLAN_MODE_PASSTHRU], [], [], [[
+ #include <sys/socket.h>
+ #include <linux/if_link.h>
+ ]])
+fi
+
AC_ARG_WITH([virtualport],
AC_HELP_STRING([--with-virtualport],[enable virtual port support
@<:@default=check@:>@]),
diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index 989dcf6..70a120b 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -1429,6 +1429,13 @@
external router or gateway and that device sends them back to the
host. This procedure is followed if either the source or destination
device is in <code>private</code> mode.</dd>
+ <dt><code>passthru</code></dt>
+ <dd>This feature attaches a virtual function of a SRIOV capable
+ NIC directly to a VM without losing the migration capability.
+ All packets are sent to the VF/IF of the configured network device.
+ Depending on the capabilities of the device additional
prerequisites or
+ limitations may apply; for example, on Linux this requires
+ kernel 2.6.38 or newer. <span class="since">Since 0.9.2</span></dd>
</dl>
<pre>
diff --git a/docs/schemas/domain.rng b/docs/schemas/domain.rng
index 7163c6e..b252547 100644
--- a/docs/schemas/domain.rng
+++ b/docs/schemas/domain.rng
@@ -2351,7 +2351,7 @@
</define>
<define name="bridgeMode">
<data type="string">
- <param name="pattern">(vepa|bridge|private)</param>
+ <param name="pattern">(vepa|bridge|private|passthrough)</param>
</data>
</define>
<define name="addrMAC">
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 498438a..3298c80 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -433,7 +433,8 @@ VIR_ENUM_IMPL(virDomainSeclabel,
VIR_DOMAIN_SECLABEL_LAST,
VIR_ENUM_IMPL(virDomainNetdevMacvtap, VIR_DOMAIN_NETDEV_MACVTAP_MODE_LAST,
"vepa",
"private",
- "bridge")
+ "bridge",
+ "passthrough")
VIR_ENUM_IMPL(virVirtualPort, VIR_VIRTUALPORT_TYPE_LAST,
"none",
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index fe42f21..5fe31d4 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -335,6 +335,7 @@ enum virDomainNetdevMacvtapType {
VIR_DOMAIN_NETDEV_MACVTAP_MODE_VEPA,
VIR_DOMAIN_NETDEV_MACVTAP_MODE_PRIVATE,
VIR_DOMAIN_NETDEV_MACVTAP_MODE_BRIDGE,
+ VIR_DOMAIN_NETDEV_MACVTAP_MODE_PASSTHRU,
VIR_DOMAIN_NETDEV_MACVTAP_MODE_LAST,
};
diff --git a/src/util/macvtap.c b/src/util/macvtap.c
index a7af0cb..068638e 100644
--- a/src/util/macvtap.c
+++ b/src/util/macvtap.c
@@ -1,5 +1,5 @@
/*
- * Copyright (C) 2010 Red Hat, Inc.
+ * Copyright (C) 2010-2011 Red Hat, Inc.
* Copyright (C) 2010 IBM Corporation
*
* This library is free software; you can redistribute it and/or
@@ -45,6 +45,11 @@
# include <netlink/msg.h>
+/* Older kernels lacked this enum value. */
+# if !HAVE_DECL_MACVLAN_MODE_PASSTHRU
+# define MACVLAN_MODE_PASSTHRU 8
+# endif
+
#endif /* WITH_MACVTAP || WITH_VIRTUALPORT */
#include "util.h"
@@ -473,6 +478,9 @@ macvtapModeFromInt(enum virDomainNetdevMacvtapType mode)
case VIR_DOMAIN_NETDEV_MACVTAP_MODE_BRIDGE:
return MACVLAN_MODE_BRIDGE;
+ case VIR_DOMAIN_NETDEV_MACVTAP_MODE_PASSTHRU:
+ return MACVLAN_MODE_PASSTHRU;
+
case VIR_DOMAIN_NETDEV_MACVTAP_MODE_VEPA:
default:
return MACVLAN_MODE_VEPA;
@@ -546,7 +554,7 @@ configMacvtapTap(int tapfd, int vnet_hdr)
* be NULL if this function is supposed to choose a name
* @macaddress: The MAC address for the macvtap device
* @linkdev: The interface name of the NIC to connect to the external
bridge
- * @mode: int describing the mode for 'bridge', 'vepa' or 'private'.
+ * @mode: int describing the mode for 'bridge', 'vepa', 'private' or
'passthru'.
* @vnet_hdr: 1 to enable IFF_VNET_HDR, 0 to disable it
* @vmuuid: The UUID of the VM the macvtap belongs to
* @virtPortProfile: pointer to object holding the virtual port profile
data
diff --git a/src/util/macvtap.h b/src/util/macvtap.h
index 54205c7..c45dd13 100644
--- a/src/util/macvtap.h
+++ b/src/util/macvtap.h
@@ -92,6 +92,7 @@ void delMacvtap(const char *ifname,
# define MACVTAP_MODE_PRIVATE_STR "private"
# define MACVTAP_MODE_VEPA_STR "vepa"
# define MACVTAP_MODE_BRIDGE_STR "bridge"
+# define MACVTAP_MODE_PASSTHRU_STR "passthru"
int vpAssociatePortProfileId(const char *macvtap_ifname,
const unsigned char *macvtap_macaddr,
--
1.7.4.4
--
Eric Blake eblake at redhat.com +1-801-349-2682
Libvirt virtualization library http://libvirt.org
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