[dpdk-dev] [PATCH 6/8] net/mlx4: mitigate Tx send entry size calculations

[Adrien Mazarguil]

On Tue, Nov 28, 2017 at 12:19:28PM +0000, Matan Azrad wrote:
> The previuse code took a send queue entry size for stamping from the
> send queue entry pointed by completion queue entry; This 2 reads were
> done per packet in completion stage.
> 
> The completion burst packets number is managed by fixed size stored in
> Tx queue, so we can infer that each valid completion entry actually frees
> the next fixed number packets.
> 
> The descriptors ring holds the send queue entry, so we just can infer
> all the completion burst packet entries size by simple calculation and
> prevent calculations per packet.
> 
> Adjust completion functions to free full completion bursts packets
> by one time and prevent per packet work queue entry reads and
> calculations.
> 
> Save only start of completion burst or Tx burst send queue entry
> pointers in the appropriate descriptor element.
> 
> Signed-off-by: Matan Azrad <matan at mellanox.com>

Acked-by: Adrien Mazarguil <adrien.mazarguil at 6wind.com>

-- 
Adrien Mazarguil
6WIND