doc: announce ethdev port id range increase

This is an API/ABI change notice for DPDK 17.11 announcing the redefinition
of port_id. port_id is currently defined as uint8_t, which is limited to
the range 0 to 255. A larger range is required for vdev scalability.

It is necessary for a redefinition of port_id to extend it from 1 bytes to
2 bytes. All ethdev APIs and usages related to port_id will be changed at
the same time.

Signed-off-by: Zhiyong Yang <zhiyong.yang@intel.com>
Acked-by: Jianfeng Tan <jianfeng.tan@intel.com>
Acked-by: Yuanhan Liu <yliu@fridaylinux.org>
Acked-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>
Acked-by: Remy Horton <remy.horton@intel.com>
Acked-by: Shahaf Shuler <shahafs@mellanox.com>

diff --git a/doc/guides/rel_notes/deprecation.rst b/doc/guides/rel_notes/deprecation.rst
index 74e4ce4..9a5f6b8 100644 (file)
--- a/doc/guides/rel_notes/deprecation.rst
+++ b/doc/guides/rel_notes/deprecation.rst
@@ -76,6 +76,12 @@ Deprecation Notices
   done by the EAL and not by the ``ethdev`` layer anymore. Users relying on this
   flag being present only have to remove their checks to follow the change.
 
+* ABI/API changes are planned for 17.11 in all structures which include port_id
+  definition such as "rte_eth_dev_data", "rte_port_ethdev_reader_params",
+  "rte_port_ethdev_writer_params", and so on. The definition of port_id will be
+  changed from 8 bits to 16 bits in order to support more than 256 ports in
+  DPDK. All APIs which have port_id parameter will be changed at the same time.
+
 * librte_table: The ``key_mask`` parameter will be added to all the hash tables
   that currently do not have it, as well as to the hash compute function prototype.
   The non-"do-sig" versions of the hash tables will be removed