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SubjectRE: [PATCH net-next 08/10] hv_netvsc: Don't ask for additional head room in the skb
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> -----Original Message-----
> From: Vitaly Kuznetsov [mailto:vkuznets@redhat.com]
> Sent: Tuesday, November 24, 2015 12:56 AM
> To: KY Srinivasan <kys@microsoft.com>
> Cc: davem@davemloft.net; netdev@vger.kernel.org; linux-
> kernel@vger.kernel.org; devel@linuxdriverproject.org; olaf@aepfle.de;
> apw@canonical.com; jasowang@redhat.com
> Subject: Re: [PATCH net-next 08/10] hv_netvsc: Don't ask for additional head
> room in the skb
>
> "K. Y. Srinivasan" <kys@microsoft.com> writes:
>
> > The rndis header is 116 bytes big and can be placed in the default
> > head room that will be available in the skb.
>
> We have the following in include/linux/netdevice.h:
>
> #if defined(CONFIG_WLAN) || IS_ENABLED(CONFIG_AX25)
> # if defined(CONFIG_MAC80211_MESH)
> # define LL_MAX_HEADER 128
> # else
> # define LL_MAX_HEADER 96
> # endif
> #else
> # define LL_MAX_HEADER 32
> #endif
>
> In case someone disables MAC80211_MESH in his kernel config we're in
> troubles again. I suggest we add additional patch here making sure it is
> 128 bytes for Hyper-V:
>
> #if defined(CONFIG_HYPERV_NET)
> # define LL_MAX_HEADER 128
> #elseif defined(CONFIG_WLAN) || IS_ENABLED(CONFIG_AX25)
> ...

Thanks Vitaly; will do.

K. Y


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