On 11/24/2020 11:43 AM, Ori Kam wrote:
Hi
-----Original Message-----
From: Ferruh Yigit <ferruh.yi...@intel.com>
Sent: Monday, November 23, 2020 5:51 PM
Subject: Re: [PATCH] doc: announce flow API matching pattern struct changes
On 11/23/2020 2:25 PM, Andrew Rybchenko wrote:
On 11/23/20 5:17 PM, Ferruh Yigit wrote:
On 11/23/2020 1:50 PM, Andrew Rybchenko wrote:
On 11/23/20 4:40 PM, Ferruh Yigit wrote:
Proposing to replace protocol header fields in the ``rte_flow_item_*``
structures with the protocol structs, like:
Current ``struct rte_flow_item_eth``,
struct rte_flow_item_eth {
struct rte_ether_addr dst;
struct rte_ether_addr src;
rte_be16_t type;
uint32_t has_vlan:1;
uint32_t reserved:31;
}
will become
struct rte_flow_item_eth {
struct rte_ether_hdr hdr;
uint32_t has_vlan:1;
uint32_t reserved:31;
}
This is both for documenting the intention and to be sure
``rte_flow_item_*`` always starts with complete protocol header.
Already many ``rte_flow_item_*`` structs implemented to have protocol
struct, target is convert all to this usage.
Signed-off-by: Ferruh Yigit <ferruh.yi...@intel.com>
Acked-by: Andrew Rybchenko <andrew.rybche...@oktetlabs.ru>
a minor note below
---
Cc: Thomas Monjalon <tho...@monjalon.net>
Cc: Andrew Rybchenko <andrew.rybche...@oktetlabs.ru>
Cc: Ori Kam <or...@nvidia.com>
---
doc/guides/rel_notes/deprecation.rst | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/doc/guides/rel_notes/deprecation.rst
b/doc/guides/rel_notes/deprecation.rst
index 96986fabd598..a2fa0c196472 100644
--- a/doc/guides/rel_notes/deprecation.rst
+++ b/doc/guides/rel_notes/deprecation.rst
@@ -88,6 +88,13 @@ Deprecation Notices
will be limited to maximum 256 queues.
Also compile time flag ``RTE_ETHDEV_QUEUE_STAT_CNTRS`` will be
removed.
+* ethdev: The flow API matching pattern structures, ``struct
rte_flow_item_*``,
+ should start with relevant protocol header.
+ Some matching pattern structures implements this by duplicating
protocol header
+ fields in the struct. To clarify the intention and to be sure
protocol header
+ is intact, will replace those fields with relevant protocol
header struct.
+ Target is v21.02 release and this should not change the ABI.
+
* sched: To allow more traffic classes, flexible mapping of pipe
queues to
traffic classes, and subport level configuration of pipes and
queues
changes will be made to macros, data structures and API
functions defined
Just want to highlight that even API could be kept using
unnamed union for hdr and unnamed structure for existing
protocol header fields.
Then we may never clean the protocol header fields out of it,
yes this will impact the user but I believe the impact is small and
trivial,
I prefer replacing fields with protocol struct.
The problem that API breakages are bad and, for example, OvS uses these
fields.
May be API breakage should be postponed to 21.11?
Agree but it is not as bad as ABI break, if user is already compiling their
code, it is not too bad to adjust the struct for changes, and the changes are
straightforward.
I'm not sure which is worse ABI or API, API is more straight forward but all
apps must be modified,
while ABI is hidden and happens only in rare cases.
In a addition it may result in large number of changes (simple but large number)
But if, somehow, application needs to support multiple version of the DPDK it
can be headache.
Agree,
We may go with your suggestion until 21.11, and do the cleanup on 21.11, will
it
work?
+1 also when considering my next line,
One more point to consider what happens to struct that are not according to
spec,
for example mpls, geneve where the struct is different than the item.
At least for mpls & geneve, the ABI still looks same so change is still
possible, but a few fields seems merged which means the change will require more
updates in the user application and the drivers. Anyway, agree to postpone
change to the 21.11.
I will send a v2.
