Re: [PATCH v1 1/3] cryptodev: add min headroom and tailroom requirement
From: De Lara Guarch, Pablo <hidden>
Date: 2018-07-10 10:26:46
Hi Anoob,
quoted hunk ↗ jump to hunk
-----Original Message----- From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Anoob Joseph Sent: Wednesday, July 4, 2018 2:56 PM To: Doherty, Declan <redacted>; De Lara Guarch, Pablo [off-list ref] Cc: Anoob Joseph <redacted>; Akhil Goyal [off-list ref]; Ankur Dwivedi [off-list ref]; Jerin Jacob [off-list ref]; Narayana Prasad [off-list ref]; dev@dpdk.org Subject: [dpdk-dev] [PATCH v1 1/3] cryptodev: add min headroom and tailroom requirement Enabling crypto devs to specify the minimum headroom and tailroom it expects in the mbuf. For net PMDs, standard headroom has to be honoured by applications, which is not strictly followed for crypto devs. This prevents crypto devs from using free space in mbuf (available as head/tailroom) for internal requirements in crypto operations. Addition of head/tailroom requirement will help PMDs to communicate such requirements to the application. The availability and use of head/tailroom is an optimization if the hardware supports use of head/tailroom for crypto-op info. For devices that do not support using the head/tailroom, they can continue to operate without any performance-drop. Signed-off-by: Anoob Joseph <redacted> --- v1: * Removed deprecation notice * Updated release note * Renamed new fields to have 'mbuf' in the name * Changed the type of new fields to uint16_t (instead of uint32_t) doc/guides/rel_notes/release_18_08.rst | 6 ++++++ lib/librte_cryptodev/rte_cryptodev.h | 6 ++++++ 2 files changed, 12 insertions(+)diff --git a/doc/guides/rel_notes/release_18_08.rstb/doc/guides/rel_notes/release_18_08.rst index 5bc23c5..fae0d26 100644--- a/doc/guides/rel_notes/release_18_08.rst +++ b/doc/guides/rel_notes/release_18_08.rst@@ -70,6 +70,12 @@ ABI Changes Also, make sure to start the actual text at the margin. ========================================================= +* cryptodev: Additional fields in rte_cryptodev_info. + + Two new fields of type ``uint16_t`` added in ``rte_cryptodev_info`` + structure: ``min_mbuf_headroom_req`` and ``min_mbuf_tailroom_req``. + These parameters specify the recommended headroom and tailroom for + mbufs to be processed by the PMD.
I think the "cryptodev scheduler PMD" needs changes to take these new parameters into consideration. Scheduler_pmd_info_get should return the maximum number of these two fields on all the slaves (like what's done with max number of sessions). We need to close the subtree today, with all API changes done. Will you have time to make this change today? Thanks! Pablo