netdev - Re: [PATCH net-next 0/2] Fix batched event generation for mirred action

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Message-Id: <20190701.191818.2016313422296779356.davem@davemloft.net>
Date:   Mon, 01 Jul 2019 19:18:18 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     mrv@...atatu.com
Cc:     netdev@...r.kernel.org, kernel@...atatu.com, jhs@...atatu.com,
        xiyou.wangcong@...il.com, jiri@...nulli.us
Subject: Re: [PATCH net-next 0/2] Fix batched event generation for mirred
 action

From: Roman Mashak <mrv@...atatu.com>
Date: Fri, 28 Jun 2019 14:30:16 -0400

> When adding or deleting a batch of entries, the kernel sends upto
> TCA_ACT_MAX_PRIO 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 :
> 
> % cat tc-batch.sh
> TC="sudo /mnt/iproute2.git/tc/tc"
> 
> $TC actions flush action mirred
> for i in `seq 1 $1`;
> do
>    cmd="action mirred egress redirect dev lo index $i "
>    args=$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 mirred 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 test cases.

Series applied, thanks.