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From: Ferruh Yigit <ferruh.yigit@intel.com>
To: Ray Kinsella <mdr@ashroe.eu>, Neil Horman <nhorman@tuxdriver.com>
Cc: Ferruh Yigit <ferruh.yigit@intel.com>,
	dev@dpdk.org, Thomas Monjalon <thomas@monjalon.net>,
	Andrew Rybchenko <arybchenko@solarflare.com>,
	Konstantin Ananyev <konstantin.ananyev@intel.com>,
	Matan Azrad <matan@nvidia.com>,
	Olivier Matz <olivier.matz@6wind.com>,
	Jerin Jacob <jerinj@marvell.com>
Subject: [dpdk-dev] [RFC] doc: announce max Rx packet len field deprecation
Date: Tue, 20 Oct 2020 13:03:05 +0100	[thread overview]
Message-ID: <20201020120305.1516513-1-ferruh.yigit@intel.com> (raw)

Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>
Cc: Thomas Monjalon <thomas@monjalon.net>
Cc: Andrew Rybchenko <arybchenko@solarflare.com>
Cc: Konstantin Ananyev <konstantin.ananyev@intel.com>
Cc: Matan Azrad <matan@nvidia.com>
Cc: Olivier Matz <olivier.matz@6wind.com>
Cc: Jerin Jacob <jerinj@marvell.com>
 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
+  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
+  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

             reply	other threads:[~2020-10-20 12:03 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-20 12:03 Ferruh Yigit [this message]
2020-10-21 10:18 ` Ananyev, Konstantin
2020-10-21 15:10   ` Andrew Rybchenko
2020-10-21 16:28     ` Ferruh Yigit
2020-10-21 12:40 ` Kinsella, Ray
2020-11-24 17:36 ` [dpdk-dev] [RFC v2] " Ferruh Yigit
2020-11-24 17:47   ` Ajit Khaparde
2020-11-26 11:28   ` Andrew Rybchenko
2020-11-26 12:34     ` Ferruh Yigit
2020-11-27 18:38       ` Thomas Monjalon
2020-11-26 18:30   ` Matan Azrad
2020-11-27  9:37     ` [dpdk-dev] [RFC v2] doc: announce max Rx packet len fielddeprecation Morten Brørup

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