netdev - [PATCH net-next v2 0/1] support more VFs in RTM

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Date:   Tue, 26 Jan 2021 09:40:23 -0800
From:   Edwin Peer <edwin.peer@...adcom.com>
To:     netdev@...r.kernel.org
Cc:     Edwin Peer <edwin.peer@...adcom.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Andrew Gospodarek <andrew.gospodarek@...adcom.com>,
        Michael Chan <michael.chan@...adcom.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Michal Kubecek <mkubecek@...e.cz>,
        David Ahern <dsahern@...il.com>
Subject: [PATCH net-next v2 0/1] support more VFs in RTM_GETLINK 

RTM_GETLINK for greater than about 220 VFs truncates IFLA_VFINFO_LIST
due to the maximum reach of nlattr's nla_len being exceeded. There is
not a lot of enthusiasm for extensive fixes to the deprecated netlink
ABI for VF config, but there appears to be even less appetite for the
kinds of work arounds that would be necessitated in order to truly
keep it frozen [1].

Any kind of fix for this at the RTM_GETLINK VF API layer is also a no
go [2]. For now, lets fix the bits that are uncontroversial so that a
naked 'ip link show' (without stats) works.

v2: Drop the pieces that require further discussion.

[1] https://lore.kernel.org/netdev/20210115225950.18762-1-edwin.peer@broadcom.com/
[2] https://marc.info/?l=linux-netdev&m=161163943811663 (missing on lore)

Edwin Peer (1):
  rtnetlink: extend RTEXT_FILTER_SKIP_STATS to IFLA_VF_INFO

 net/core/rtnetlink.c | 96 +++++++++++++++++++++++---------------------
 1 file changed, 51 insertions(+), 45 deletions(-)

-- 
2.30.0

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