netdev - Re: [PATCH net-next 0/7] openvswitch: add drop reasons

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Date: Mon, 24 Jul 2023 10:34:37 -0400
From: Aaron Conole <aconole@...hat.com>
To: Adrian Moreno <amorenoz@...hat.com>
Cc: netdev@...r.kernel.org,  dev@...nvswitch.org,  i.maximets@....org,
  eric@...ver.life, "David S. Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
 <pabeni@...hat.com>
Subject: Re: [PATCH net-next 0/7] openvswitch: add drop reasons

Adrian Moreno <amorenoz@...hat.com> writes:

> There is currently a gap in drop visibility in the openvswitch module.
> This series tries to improve this by adding a new drop reason subsystem
> for OVS.
>
> Apart from adding a new drop reasson subsystem and some common drop
> reasons, this series takes Eric's preliminary work [1] on adding an
> explicit drop action and integrates it into the same subsystem.
>
> This series also adds some selftests and so it requires [2] to be
> applied first.
>
> A limitation of this series is that it does not report upcall errors.
> The reason is that there could be many sources of upcall drops and the
> most common one, which is the netlink buffer overflow, cannot be
> reported via kfree_skb() because the skb is freed in the netlink layer
> (see [3]). Therefore, using a reason for the rare events and not the
> common one would be even more misleading. I'd propose we add (in a
> follow up patch) a tracepoint to better report upcall errors.

I guess you meant to add RFC tag to this, since it depends on other
series that aren't accepted yet.

If it's okay, I will pull in your patch 5/7 when I re-post my flow
additions series, since it will need to be added there at some point
anyway.

> [1] https://lore.kernel.org/netdev/202306300609.tdRdZscy-lkp@intel.com/T/
> [2] https://lore.kernel.org/all/9375ccbc-dd40-9998-dde5-c94e4e28f4f1@redhat.com/T/ 
> [3] commit 1100248a5c5c ("openvswitch: Fix double reporting of drops in dropwatch")
>
> Adrian Moreno (6):
>   net: openvswitch: add datapath flow drop reason
>   net: openvswitch: add meter drop reason
>   net: openvswitch: add misc error drop reasons
>   selftests: openvswitch: support key masks
>   selftests: openvswitch: add drop reason testcase
>   selftests: openvswitch: add explicit drop testcase
>
> Eric Garver (1):
>   net: openvswitch: add explicit drop action
>
>  include/net/dropreason.h                      |   6 +
>  include/uapi/linux/openvswitch.h              |   2 +
>  net/openvswitch/actions.c                     |  40 ++++--
>  net/openvswitch/conntrack.c                   |   3 +-
>  net/openvswitch/datapath.c                    |  16 +++
>  net/openvswitch/drop.h                        |  33 +++++
>  net/openvswitch/flow_netlink.c                |   8 +-
>  .../selftests/net/openvswitch/openvswitch.sh  |  92 +++++++++++++-
>  .../selftests/net/openvswitch/ovs-dpctl.py    | 115 ++++++++++++------
>  9 files changed, 267 insertions(+), 48 deletions(-)
>  create mode 100644 net/openvswitch/drop.h