Re: [patch net 0/2] mlxsw: Couple of fixes

[Jiri Pirko]

Wed, Oct 05, 2016 at 02:29:27AM CEST, da...@davemloft.net wrote:
>From: Jiri Pirko <j...@resnulli.us>
>Date: Tue,  4 Oct 2016 09:46:03 +0200
>
>> Couple of fixes from Yotam.
>
>Series applied, thanks.
>
>Note that needed_headroom is a request, rather than a guarantee, so you
>may in some rare cases need to realloc your headroom if the kernel was
>not able to meet your request.

We already do that: 

        if (unlikely(skb_headroom(skb) < MLXSW_TXHDR_LEN)) {
                struct sk_buff *skb_orig = skb;

                skb = skb_realloc_headroom(skb, MLXSW_TXHDR_LEN);
                if (!skb) {
                        this_cpu_inc(mlxsw_sp_port->pcpu_stats->tx_dropped);
                        dev_kfree_skb_any(skb_orig);
                        return NETDEV_TX_OK;
                }
        }