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macvlan/macvtap: support 'passthru' mode 

Add support for 'passthru' mode when creating a macvlan/macvtap device
which allows takeover of the underlying device and passing it to a KVM
guest using virtio with macvtap backend.

Only one macvlan device is allowed in passthru mode and it inherits
the mac address from the underlying device and sets it in promiscuous
mode to receive and forward all the packets.

Signed-off-by: Sridhar Samudrala <sri@us.ibm.com>
This commit is contained in:
Sridhar Samudrala 2011-03-16 17:01:58 -07:00 committed by Stephen Hemminger
parent fcae78992c
commit f0612d566b
2 changed files with 10 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
ip/iplink_macvlan.c
View File

@ -23,14 +23,14 @@
static void explain(void)
{
fprintf(stderr,
"Usage: ... macvlan mode { private | vepa | bridge }\n"
"Usage: ... macvlan mode { private | vepa | bridge | passthru }\n"
);
}
static int mode_arg(void)
{
fprintf(stderr, "Error: argument of \"mode\" must be \"private\", "
"\"vepa\" or \"bridge\"\n");
"\"vepa\", \"bridge\" or \"passthru\" \n");
return -1;
}
@ -48,6 +48,8 @@ static int macvlan_parse_opt(struct link_util *lu, int argc, char **argv,
mode = MACVLAN_MODE_VEPA;
else if (strcmp(*argv, "bridge") == 0)
mode = MACVLAN_MODE_BRIDGE;
else if (strcmp(*argv, "passthru") == 0)
mode = MACVLAN_MODE_PASSTHRU;
else
return mode_arg();
@ -82,6 +84,7 @@ static void macvlan_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[]
mode == MACVLAN_MODE_PRIVATE ? "private"
: mode == MACVLAN_MODE_VEPA ? "vepa"
: mode == MACVLAN_MODE_BRIDGE ? "bridge"
: mode == MACVLAN_MODE_PASSTHRU ? "passthru"
: "unknown");
}

7
ip/iplink_macvtap.c
View File

@ -20,14 +20,14 @@
static void explain(void)
{
fprintf(stderr,
"Usage: ... macvtap mode { private | vepa | bridge }\n"
"Usage: ... macvtap mode { private | vepa | bridge | passthru }\n"
);
}
static int mode_arg(void)
{
fprintf(stderr, "Error: argument of \"mode\" must be \"private\", "
"\"vepa\" or \"bridge\"\n");
"\"vepa\", \"bridge\" or \"passthru\" \n");
return -1;
}
@ -45,6 +45,8 @@ static int macvtap_parse_opt(struct link_util *lu, int argc, char **argv,
mode = MACVLAN_MODE_VEPA;
else if (strcmp(*argv, "bridge") == 0)
mode = MACVLAN_MODE_BRIDGE;
else if (strcmp(*argv, "passthru") == 0)
mode = MACVLAN_MODE_PASSTHRU;
else
return mode_arg();
@ -79,6 +81,7 @@ static void macvtap_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[]
mode == MACVLAN_MODE_PRIVATE ? "private"
: mode == MACVLAN_MODE_VEPA ? "vepa"
: mode == MACVLAN_MODE_BRIDGE ? "bridge"
: mode == MACVLAN_MODE_PASSTHRU ? "passthru"
: "unknown");
}