* [dpdk-dev] DPDK compress API - questions
@ 2021-01-06 15:57 Matan Azrad
2021-01-06 16:05 ` Trahe, Fiona
0 siblings, 1 reply; 2+ messages in thread
From: Matan Azrad @ 2021-01-06 15:57 UTC (permalink / raw)
To: Trahe, Fiona, ashish.gupta; +Cc: dev, NBU-Contact-Thomas Monjalon
Hi Fiona, Ashish
I'm going to add new HW offload compress PMD for mlx5 devices in 21.02.
I have some questions on the API:
#define RTE_COMP_FF_NONCOMPRESSED_BLOCKS (1ULL << 11)
/**< Creation of non-compressed blocks using RTE_COMP_LEVEL_NONE is supported */
1. What does it mean non-compressed block ? DMA?
2. Does Using RTE_COMP_LEVEL_NONE or RTE_COMP_ALGO_NULL the same?
Probably I will add more question later...
Thanks
Matan
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [dpdk-dev] DPDK compress API - questions
2021-01-06 15:57 [dpdk-dev] DPDK compress API - questions Matan Azrad
@ 2021-01-06 16:05 ` Trahe, Fiona
0 siblings, 0 replies; 2+ messages in thread
From: Trahe, Fiona @ 2021-01-06 16:05 UTC (permalink / raw)
To: Matan Azrad, ashish.gupta; +Cc: dev, NBU-Contact-Thomas Monjalon, Trahe, Fiona
From: Matan Azrad <matan@nvidia.com>
Sent: Wednesday, January 6, 2021 3:57 PM
To: Trahe, Fiona <fiona.trahe@intel.com>; ashish.gupta@marvell.com
Cc: dev@dpdk.org; NBU-Contact-Thomas Monjalon <thomas@monjalon.net>
Subject: DPDK compress API - questions
Hi Fiona, Ashish
I'm going to add new HW offload compress PMD for mlx5 devices in 21.02.
I have some questions on the API:
#define RTE_COMP_FF_NONCOMPRESSED_BLOCKS (1ULL << 11)
/**< Creation of non-compressed blocks using RTE_COMP_LEVEL_NONE is supported */
1. What does it mean non-compressed block ? DMA?
[Fiona] Not exactly. E.g. for Deflate, if the output is non-compressed blocks, it still has the deflate headers.
So is not a direct DMA of the input data. As this may not be supported by all PMDs it is exposed in a feature flag.
2. Does Using RTE_COMP_LEVEL_NONE or RTE_COMP_ALGO_NULL the same?
[Fiona] No. ALGO_NULL would be DMA.
/**< No compression.
* Pass-through, data is copied unchanged from source buffer to
* destination buffer.
*/
LEVEL_NONE should output the data in the correct format for the specified algorithm.
Probably I will add more question later.
Thanks
Matan
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