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* [dpdk-dev] [PATCH] doc: inline data settings affect mlx5 Tx queue max size
@ 2019-08-08 11:47 Viacheslav Ovsiienko
  2019-08-08 14:25 ` Thomas Monjalon
  0 siblings, 1 reply; 2+ messages in thread
From: Viacheslav Ovsiienko @ 2019-08-08 11:47 UTC (permalink / raw)
  To: dev; +Cc: yskoh, shahafs

Introduces the possible limitations on maximal Tx queue
size in descriptors if Tx inline data are enabled.

Signed-off-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>
---
 doc/guides/nics/mlx5.rst | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/doc/guides/nics/mlx5.rst b/doc/guides/nics/mlx5.rst
index d6082ac..72de5e6 100644
--- a/doc/guides/nics/mlx5.rst
+++ b/doc/guides/nics/mlx5.rst
@@ -162,6 +162,12 @@ Limitations
   To receive IPv6 Multicast messages on VM, explicitly set the relevant
   MAC address using rte_eth_dev_mac_addr_add() API.
 
+- the amount of descriptors in Tx queue may be limited by data inline settings.
+  Inline data require the more descriptor building blocks and overall block
+  amount may exceed the hardware supported limits. The application should
+  reduce the requested Tx size or adjust data inline settings with
+  ``txq_inline_max`` and ``txq_inline_mpw`` devarg keys.
+
 - E-Switch decapsulation Flow:
 
   - can be applied to PF port only.
@@ -400,6 +406,10 @@ Run-time configuration
   option should be used with care, as it may lower performance when back
   pressure is not expected.
 
+  If inline data are enabled it may affect the maximal size of Tx queue in
+  descriptors because the inline data increase the descriptor size and
+  queue size limits supported by hardware may be exceeded.
+
 - ``txq_inline_min`` parameter [int]
 
   Minimal amount of data to be inlined into WQE during Tx operations. NICs
-- 
1.8.3.1


^ permalink raw reply	[flat|nested] 2+ messages in thread

* Re: [dpdk-dev] [PATCH] doc: inline data settings affect mlx5 Tx queue max size
  2019-08-08 11:47 [dpdk-dev] [PATCH] doc: inline data settings affect mlx5 Tx queue max size Viacheslav Ovsiienko
@ 2019-08-08 14:25 ` Thomas Monjalon
  0 siblings, 0 replies; 2+ messages in thread
From: Thomas Monjalon @ 2019-08-08 14:25 UTC (permalink / raw)
  To: Viacheslav Ovsiienko; +Cc: dev, yskoh, shahafs

08/08/2019 13:47, Viacheslav Ovsiienko:
> Introduces the possible limitations on maximal Tx queue
> size in descriptors if Tx inline data are enabled.
> 
> Signed-off-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>

Applied, thanks




^ permalink raw reply	[flat|nested] 2+ messages in thread

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2019-08-08 11:47 [dpdk-dev] [PATCH] doc: inline data settings affect mlx5 Tx queue max size Viacheslav Ovsiienko
2019-08-08 14:25 ` Thomas Monjalon

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