On 11/2/2020 1:18 PM, Andrew Rybchenko wrote:
On 11/2/20 11:52 AM, SteveX Yang wrote:
Annouce to replace 'RTE_ETHER_MAX_LEN' with 'RTE_ETHER_MTU' as type
condition of jumbo frame. Involved scopes:
- rte_ethdev;
- app, e.g.: test-pmd, test-eventdev;
- examples, e.g.: ipsec-secgw, l3fwd, vhost;
- net PMDs which support VLAN tag(s) within overhead, e.g.: i40e, ixgbe;
Signed-off-by: SteveX Yang <stevex.y...@intel.com>
---
doc/guides/rel_notes/deprecation.rst | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/doc/guides/rel_notes/deprecation.rst
b/doc/guides/rel_notes/deprecation.rst
index 2e082499b..fae139f01 100644
--- a/doc/guides/rel_notes/deprecation.rst
+++ b/doc/guides/rel_notes/deprecation.rst
@@ -138,6 +138,18 @@ Deprecation Notices
will be limited to maximum 256 queues.
Also compile time flag ``RTE_ETHDEV_QUEUE_STAT_CNTRS`` will be removed.
+* ethdev: Offload flag ``DEV_RX_OFFLOAD_JUMBO_FRAME`` will be set according to
+ ``RTE_ETHER_MTU`` in next release. Currently, the jumbo frame uses the
+ ``RTE_ETHER_MAX_LEN`` as boundary condition. When the MTU (1500) set, the
+ frame type of rx packet will be different if used different overhead, it will
+ cause the consistency issue. Hence, using fixed value ``RTE_ETHER_MTU`` can
+ avoid this issue.
+ Following scopes will be changed:
+ - ``rte_ethdev``
+ - ``app``, e.g.: ``test-pmd``, ``test-eventdev``;
+ - ``examples``, e.g.: ``ipsec-secgw``, ``l3fwd``, ``vhost``;
+ - net PMDs which support VLAN tag(s) within overhead, e.g.: ``i40e``;
+
* cryptodev: support for using IV with all sizes is added, J0 still can
be used but only when IV length in following structs
``rte_crypto_auth_xform``,
``rte_crypto_aead_xform`` is set to zero. When IV length is greater or equal
If so, what's the point to have the offload? May be just deprecate and
later remove it?
Above just changes the condition of what is called jumbo frame, nothing more.
ethdev assumes max frame size (without jumbo frame support) can be
'RTE_ETHER_MAX_LEN' (1518)
But a PMD can support double VLAN, and it can have RTE_ETHER_MAX_LEN + 8 bytes
frame size and still may not support jumbo frame.
In that case ethdev overwrites the frame size as RTE_ETHER_MAX_LEN, and this
will reduce the supported MTU to 1492 (instead of expected 1500).
Above deprecation notice is to fix this.
