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WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.12.1 MIME-Version: 1.0 In-Reply-To: <20201020120305.1516513-1-ferruh.yigit@intel.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-AuthUser: mdr@ashroe.eu Subject: Re: [dpdk-dev] [RFC] doc: announce max Rx packet len field deprecation X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" On 20/10/2020 13:03, Ferruh Yigit wrote: > Signed-off-by: Ferruh Yigit > --- > Cc: Thomas Monjalon > Cc: Andrew Rybchenko > Cc: Konstantin Ananyev > Cc: Matan Azrad > Cc: Olivier Matz > Cc: Jerin Jacob > --- > doc/guides/rel_notes/deprecation.rst | 25 +++++++++++++++++++++++++ > 1 file changed, 25 insertions(+) > > diff --git a/doc/guides/rel_notes/deprecation.rst b/doc/guides/rel_notes/deprecation.rst > index 8ceb385141..d4a31392d3 100644 > --- a/doc/guides/rel_notes/deprecation.rst > +++ b/doc/guides/rel_notes/deprecation.rst > @@ -149,6 +149,31 @@ Deprecation Notices > will be limited to maximum 256 queues. > Also compile time flag ``RTE_ETHDEV_QUEUE_STAT_CNTRS`` will be removed. > > +* ethdev: In ``struct rte_eth_rxmode``, ``uint32_t max_rx_pkt_len`` will be > + replaced by a new ``uint32_t mtu`` in v21.11. > + The new ``mtu`` field will be used to configure the initial device MTU via > + ``rte_eth_dev_configure()`` API. > + Later MTU can be changed by ``rte_eth_dev_set_mtu()`` API as done now. > + The existing ``(struct rte_eth_dev)->data->mtu`` variable will be used to store > + the configured ``mtu`` value, > + and this new ``(struct rte_eth_dev)->data->dev_conf.rxmode.mtu`` variable will > + be used to store the user configuration request. > + Unlike ``max_rx_pkt_len``, which was valid only when ``JUMBO_FRAME`` enabled, > + ``mtu`` field will be always valid. > + When ``mtu`` config is not provided by the application, default ``RTE_ETHER_MTU`` > + value will be used. > + Driver is responsible from updating ``(struct rte_eth_dev)->data->mtu`` after MTU > + set successfully, either by ``rte_eth_dev_configure()`` or ``rte_eth_dev_set_mtu()``. > + > + Application may need to configure device for a specific Rx packet size, like for An application ... > + cases ``DEV_RX_OFFLOAD_SCATTER`` is not supported and device received packet size > + can't be bigger than Rx buffer size. > + To cover these cases application needs to know the device packet overhead to be An application ... > + able to calculate the ``mtu`` corresponding to a Rx buffer size, for this > + ``(struct rte_eth_dev_info).max_rx_pktlen`` will be kept, > + the device packet overhead can be calculated as: > + ``(struct rte_eth_dev_info).max_rx_pktlen - (struct rte_eth_dev_info).max_mtu`` > + > * 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 >