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

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Date:   Sat, 29 Jun 2019 13:45:06 -0400
From:   Jamal Hadi Salim <jhs@...atatu.com>
To:     Roman Mashak <mrv@...atatu.com>, davem@...emloft.net
Cc:     netdev@...r.kernel.org, kernel@...atatu.com,
        xiyou.wangcong@...il.com, jiri@...nulli.us
Subject: Re: [PATCH net-next 0/2] Fix batched event generation for mirred
 action

On 2019-06-28 2:30 p.m., Roman Mashak wrote:
> 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.
> 

Acked-by: Jamal Hadi Salim <jhs@...atatu.com>

cheers,
jamal