netdev - Re: [PATCH bpf 2/3] devmap: Add missing bulk queue free

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Message-ID: <20190614135806.4bcb1a31@carbon>
Date:   Fri, 14 Jun 2019 13:58:06 +0200
From:   Jesper Dangaard Brouer <brouer@...hat.com>
To:     Toshiaki Makita <toshiaki.makita1@...il.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        netdev@...r.kernel.org, xdp-newbies@...r.kernel.org,
        bpf@...r.kernel.org, "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        David Ahern <dsahern@...il.com>, brouer@...hat.com
Subject: Re: [PATCH bpf 2/3] devmap: Add missing bulk queue free

On Fri, 14 Jun 2019 17:20:14 +0900
Toshiaki Makita <toshiaki.makita1@...il.com> wrote:

> dev_map_free() forgot to free bulk queue when freeing its entries.
> 
> Fixes: 5d053f9da431 ("bpf: devmap prepare xdp frames for bulking")
> Signed-off-by: Toshiaki Makita <toshiaki.makita1@...il.com>
> ---
>  kernel/bpf/devmap.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/kernel/bpf/devmap.c b/kernel/bpf/devmap.c
> index e001fb1..a126d95 100644
> --- a/kernel/bpf/devmap.c
> +++ b/kernel/bpf/devmap.c
> @@ -186,6 +186,7 @@ static void dev_map_free(struct bpf_map *map)
>  		if (!dev)
>  			continue;
>  
> +		free_percpu(dev->bulkq);
>  		dev_put(dev->dev);
>  		kfree(dev);
>  	}

Do we need to call need to call dev_map_flush_old() before
free_percpu(dev->bulkq) ?

Looking the code, I guess this is not needed as, above we are ensuring
all pending flush operations have completed.

Acked-by: Jesper Dangaard Brouer <brouer@...hat.com>

-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Principal Kernel Engineer at Red Hat
  LinkedIn: http://www.linkedin.com/in/brouer