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doc: announce ethdev ABI change for MTU limits info

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Maximum and minimum MTU values vary between hardware devices. In
hardware agnostic DPDK applications access to such information would
allow a more accurate way of validating and setting supported MTU values on
a per device basis rather than using a defined default for all devices.

The following solution was proposed:

http://mails.dpdk.org/archives/dev/2018-September/110959.html

This patch adds a depreciation notice for ``rte_eth_dev_info`` as new
members will be added to represent min and max MTU values. These can be
added to fit a hole in the existing structure for amd64 but not for 32 bit,
as such ABI change will occur as size of the structure will be impacted.

Signed-off-by: Ian Stokes <ian.stokes@intel.com>
Acked-by: Ferruh Yigit <ferruh.yigit@intel.com>
Acked-by: Thomas Monjalon <thomas@monjalon.net>
Acked-by: Andrew Rybchenko <arybchenko@solarflare.com>
This commit is contained in:
Ian Stokes 2018-11-22 12:09:09 +00:00 committed by Thomas Monjalon
parent a560a564bc
commit 799e4d9fa8
1 changed files with 12 additions and 0 deletions
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doc/guides/rel_notes/deprecation.rst
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@ -63,6 +63,18 @@ Deprecation Notices
Target release for removal of the legacy API will be defined once most
PMDs have switched to rte_flow.
* ethdev: Maximum and minimum MTU values vary between hardware devices. In
hardware agnostic DPDK applications access to such information would allow
a more accurate way of validating and setting supported MTU values on a per
device basis rather than using a defined default for all devices. To
resolve this, the following members will be added to ``rte_eth_dev_info``.
Note: these can be added to fit a hole in the existing structure for amd64
but not for 32-bit, as such ABI change will occur as size of the structure
will increase.
- Member ``uint16_t min_mtu`` the minimum MTU allowed.
- Member ``uint16_t max_mtu`` the maximum MTU allowed.
* pdump: As we changed to use generic IPC, some changes in APIs and structure
are expected in subsequent release.