[dpdk-dev] [PATCH 0/2] Enabling default mbuf segments support

Sunil Kumar Kori skori at marvell.com
Mon May 27 10:35:27 CEST 2019

rte_eth_dev_info structure exposes, nb_seg_max & nb_mtu_seg_max to provide
maximum number of segments supported by the platform but API does not provide
any default value as well as no show case of above mentioned fields while
creating mbuf pool.

Also in absence of this, there may be a gap bewteen application configuration
and PMD capabilities.

Consider below mentioned points:
Point 1:
- PMD may support N or infinte segments. So no defined value is assigned to
  represent infinite value.

Point 2:
- PMD supports n segments at max and exposed the same to application.
- But application didn't created mbuf pool accoding to maximum supported segments
  so it may be that to support larger packet, application needs more segments than
  PMD's capability. So packet transmission operation may be discarded by the PMD.

Patch set implenments default value and their usage in testpmd to provide a show
case. It will help application to create mbuf pool with correct buffer size so
that application can cater all sized packets properly.

Sunil Kumar Kori (2):
  lib/librte_ethdev: add in default value of rte_eth_dev_info
  app/testpmd: creating mbuf pool based on maximum supported segments

 app/test-pmd/testpmd.c         | 21 +++++++++++++++++++++
 lib/librte_ethdev/rte_ethdev.c |  2 ++
 lib/librte_ethdev/rte_ethdev.h |  2 ++
 3 files changed, 25 insertions(+)


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