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Force MTU 9216 on lcpng TAP interfaces

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The TAP interface does copy forward the host MTU based on the VPP
interface's L3 MTU, but it should also ensure that the VPP tap
interface has an MTU that is greater-or-equal to those.  Considering
users can set the interfaces at runtime (set interface mtu packet ...)
ensure that the tap MTU is large enough.

Ideally, a callback updates the MTU to the same value as the L3 MTU of
the VPP interface, or the L3 MTU of the host interface, if either of
those change. For now, it's a safe bet to take jumbo 9216.
This commit is contained in:
Pim van Pelt
2021-08-08 21:35:13 +02:00
parent 2f51a196fc
commit 8111d1e9a8
1 changed files with 9 additions and 0 deletions
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9
lcpng_interface.c
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@ -775,6 +775,15 @@ lcp_itf_pair_create (u32 phy_sw_if_index, u8 *host_if_name,
return args.rv; return args.rv;
} }
/*
* The TAP interface does copy forward the host MTU based on the VPP
* interface's L3 MTU, but it should also ensure that the VPP tap
* interface has an MTU that is greater-or-equal to those. Considering
* users can set the interfaces at runtime (set interface mtu packet ...)
* ensure that the tap MTU is large enough.
*/
vnet_sw_interface_set_mtu (vnm, args.sw_if_index, 9216);
/* /*
* get the hw and ethernet of the tap * get the hw and ethernet of the tap
*/ */