netdev - [PATCH net 0/2] Fix batched event generation for skbedit action

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Message-Id: <1565207849-11442-1-git-send-email-mrv@mojatatu.com>
Date:   Wed,  7 Aug 2019 15:57:27 -0400
From:   Roman Mashak <mrv@...atatu.com>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, kernel@...atatu.com, jhs@...atatu.com,
        xiyou.wangcong@...il.com, jiri@...nulli.us,
        Roman Mashak <mrv@...atatu.com>
Subject: [PATCH net 0/2] Fix batched event generation for skbedit action

When adding or deleting a batch of entries, the kernel sends up to
TCA_ACT_MAX_PRIO (defined to 32 in kernel) entries in an event to user
space. However it does not consider that the action sizes may vary and
require different skb sizes.

For example, consider the following script adding 32 entries with all
supported skbedit parameters and cookie (in order to maximize netlink
messages size):

% cat tc-batch.sh
TC="sudo /mnt/iproute2.git/tc/tc"

$TC actions flush action skbedit
for i in `seq 1 $1`;
do
   cmd="action skbedit queue_mapping 2 priority 10 mark 7/0xaabbccdd \
               ptype host inheritdsfield \
               index $i cookie aabbccddeeff112233445566778800a1 "
   args=$args$cmd
done
$TC actions add $args
%
% ./tc-batch.sh 32
Error: Failed to fill netlink attributes while adding TC action.
We have an error talking to the kernel
%

patch 1 adds callback in tc_action_ops of skbedit action, which calculates
the action size, and passes size to tcf_add_notify()/tcf_del_notify().

patch 2 updates the TDC test suite with relevant skbedit test cases.

Roman Mashak (2):
  net sched: update skbedit action for batched events operations
  tc-testing: updated skbedit action tests with batch create/delete

 net/sched/act_skbedit.c                            | 12 ++++++
 .../tc-testing/tc-tests/actions/skbedit.json       | 47 ++++++++++++++++++++++
 2 files changed, 59 insertions(+)

-- 
2.7.4