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--- /dev/null
+.. BSD LICENSE
+ Copyright(c) 2017 Intel Corporation. All rights reserved.
+ All rights reserved.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions
+ are met:
+
+ * Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in
+ the documentation and/or other materials provided with the
+ distribution.
+ * Neither the name of Intel Corporation nor the names of its
+ contributors may be used to endorse or promote products derived
+ from this software without specific prior written permission.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+Cryptodev Scheduler Poll Mode Driver Library
+============================================
+
+Scheduler PMD is a software crypto PMD, which has the capabilities of
+attaching hardware and/or software cryptodevs, and distributes ingress
+crypto ops among them in a certain manner.
+
+.. figure:: img/scheduler-overview.*
+
+ Cryptodev Scheduler Overview
+
+
+The Cryptodev Scheduler PMD library (**librte_pmd_crypto_scheduler**) acts as
+a software crypto PMD and shares the same API provided by librte_cryptodev.
+The PMD supports attaching multiple crypto PMDs, software or hardware, as
+slaves, and distributes the crypto workload to them with certain behavior.
+The behaviors are categorizes as different "modes". Basically, a scheduling
+mode defines certain actions for scheduling crypto ops to its slaves.
+
+The librte_pmd_crypto_scheduler library exports a C API which provides an API
+for attaching/detaching slaves, set/get scheduling modes, and enable/disable
+crypto ops reordering.
+
+Limitations
+-----------
+
+* Sessionless crypto operation is not supported
+* OOP crypto operation is not supported when the crypto op reordering feature
+ is enabled.
+
+
+Installation
+------------
+
+To build DPDK with CRYTPO_SCHEDULER_PMD the user is required to set
+CONFIG_RTE_LIBRTE_PMD_CRYPTO_SCHEDULER=y in config/common_base, and
+recompile DPDK
+
+
+Initialization
+--------------
+
+To use the PMD in an application, user must:
+
+* Call rte_eal_vdev_init("crpyto_scheduler") within the application.
+
+* Use --vdev="crpyto_scheduler" in the EAL options, which will call
+ rte_eal_vdev_init() internally.
+
+
+The following parameters (all optional) can be provided in the previous
+two calls:
+
+* socket_id: Specify the socket where the memory for the device is going
+ to be allocated (by default, socket_id will be the socket where the core
+ that is creating the PMD is running on).
+
+* max_nb_sessions: Specify the maximum number of sessions that can be
+ created. This value may be overwritten internally if there are too
+ many devices are attached.
+
+* slave: If a cryptodev has been initialized with specific name, it can be
+ attached to the scheduler using this parameter, simply filling the name
+ here. Multiple cryptodevs can be attached initially by presenting this
+ parameter multiple times.
+
+Example:
+
+.. code-block:: console
+
+ ... --vdev "crypto_aesni_mb_pmd,name=aesni_mb_1" --vdev "crypto_aesni_mb_pmd,name=aesni_mb_2" --vdev "crypto_scheduler_pmd,slave=aesni_mb_1,slave=aesni_mb_2" ...
+
+.. note::
+
+ * The scheduler cryptodev cannot be started unless the scheduling mode
+ is set and at least one slave is attached. Also, to configure the
+ scheduler in the run-time, like attach/detach slave(s), change
+ scheduling mode, or enable/disable crypto op ordering, one should stop
+ the scheduler first, otherwise an error will be returned.
+
+ * The crypto op reordering feature requires using the userdata field of
+ every mbuf to be processed to store temporary data. By the end of
+ processing, the field is set to pointing to NULL, any previously
+ stored value of this field will be lost.
+
+
+Cryptodev Scheduler Modes Overview
+----------------------------------
+
+Currently the Crypto Scheduler PMD library supports following modes of
+operation:
+
+* **CDEV_SCHED_MODE_ROUNDROBIN:**
+
+ Round-robin mode, which distributes the enqueued burst of crypto ops
+ among its slaves in a round-robin manner. This mode may help to fill
+ the throughput gap between the physical core and the existing cryptodevs
+ to increase the overall performance.
git.droids-corp.org / dpdk.git / commitdiff
