Re: [Xen-devel] [PATCH net-next v3 1/3] xen-netback: Stop using xenvif_tx_pending_slots_available

[David Miller <davem@xxxxxxxxxxxxx>]

From: Zoltan Kiss <zoltan.kiss@xxxxxxxxxx>
Date: Mon, 24 Mar 2014 23:59:49 +0000

> Since the early days TX stops if there isn't enough free pending slots to
> consume a maximum sized (slot-wise) packet. Probably the reason for that is to
> avoid the case when we don't have enough free pending slot in the ring to 
> finish
> the packet. But if we make sure that the pending ring has the same size as the
> shared ring, that shouldn't really happen. The frontend can only post packets
> which fit the to the free space of the shared ring. If it doesn't, the 
> frontend
> has to stop, as it can only increase the req_prod when the whole packet fits
> onto the ring.
> This patch avoid using this checking, makes sure the 2 ring has the same size,
> and remove a checking from the callback. As now we don't stop the NAPI 
> instance
> on this condition, we don't have to wake it up if we free pending slots up.
> 
> Signed-off-by: Zoltan Kiss <zoltan.kiss@xxxxxxxxxx>

Applied.

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