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doc: add flex item specifications in mlx5 guide

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Describe firmware configuration requirements.
List mlx5 hardware and PMD limitations.

Signed-off-by: Gregory Etelson <getelson@nvidia.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>
This commit is contained in:
Gregory Etelson 2021-11-16 17:45:14 +02:00 committed by Raslan Darawsheh
parent 08ac03580e
commit 16508bfd08
1 changed files with 19 additions and 0 deletions
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19
doc/guides/nics/mlx5.rst
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@ -248,6 +248,20 @@ Limitations
extension header type = 0x85).
- Match on GTP extension header is not supported in group 0.
- Flex item:
- Hardware support: BlueField 2.
- Flex item is supported on PF only.
- Hardware limits ``header_length_mask_width`` up to 6 bits.
- Firmware supports 8 global sample fields.
Each flex item allocates non-shared sample fields from that pool.
- Supported flex item can have 1 input link - ``eth`` or ``udp``
and up to 2 output links - ``ipv4`` or ``ipv6``.
- Flex item fields (``next_header``, ``next_protocol``, ``samples``)
do not participate in RSS hash functions.
- In flex item configuration, ``next_header.field_base`` value
must be byte aligned (multiple of 8).
- No Tx metadata go to the E-Switch steering domain for the Flow group 0.
The flows within group 0 and set metadata action are rejected by hardware.
@ -1256,6 +1270,11 @@ Below are some firmware configurations listed.
FLEX_PARSER_PROFILE_ENABLE=4
PROG_PARSE_GRAPH=1
- enable dynamic flex parser for flex item::
FLEX_PARSER_PROFILE_ENABLE=4
PROG_PARSE_GRAPH=1
- enable realtime timestamp format::
REAL_TIME_CLOCK_ENABLE=1