1 .. SPDX-License-Identifier: BSD-3-Clause
2 Copyright 2018 The DPDK contributors
4 ABI and API Deprecation
5 =======================
7 See the :doc:`guidelines document for details of the ABI policy </contributing/versioning>`.
8 API and ABI deprecation notices are to be posted here.
14 * meson: The minimum supported version of meson for configuring and building
15 DPDK will be increased to v0.47.1 (from 0.41) from DPDK 19.05 onwards. For
16 those users with a version earlier than 0.47.1, an updated copy of meson
17 can be got using the ``pip``, or ``pip3``, tool for downloading python
20 * kvargs: The function ``rte_kvargs_process`` will get a new parameter
21 for returning key match count. It will ease handling of no-match case.
23 * eal: The function ``rte_eal_remote_launch`` will return new error codes
24 after read or write error on the pipe, instead of calling ``rte_panic``.
26 * eal: The ``lcore_config`` struct and global symbol will be made private to
27 remove it from the externally visible ABI and allow it to be updated in the
30 * eal: both declaring and identifying devices will be streamlined in v18.11.
31 New functions will appear to query a specific port from buses, classes of
32 device and device drivers. Device declaration will be made coherent with the
33 new scheme of device identification.
34 As such, ``rte_devargs`` device representation will change.
36 - The enum ``rte_devtype`` was used to identify a bus and will disappear.
37 - Functions previously deprecated will change or disappear:
39 + ``rte_eal_devargs_type_count``
41 * eal: The ``rte_cpu_check_supported`` function has been deprecated since
42 v17.08 and will be removed.
44 * eal: The ``rte_malloc_virt2phy`` function has been deprecated and replaced
45 by ``rte_malloc_virt2iova`` since v17.11 and will be removed.
47 * vfio: removal of ``rte_vfio_dma_map`` and ``rte_vfio_dma_unmap`` APIs which
48 have been replaced with ``rte_dev_dma_map`` and ``rte_dev_dma_unmap``
49 functions. The due date for the removal targets DPDK 20.02.
51 * pci: Several exposed functions are misnamed.
52 The following functions are deprecated starting from v17.11 and are replaced:
54 - ``eal_parse_pci_BDF`` replaced by ``rte_pci_addr_parse``
55 - ``eal_parse_pci_DomBDF`` replaced by ``rte_pci_addr_parse``
56 - ``rte_eal_compare_pci_addr`` replaced by ``rte_pci_addr_cmp``
58 * dpaa2: removal of ``rte_dpaa2_memsegs`` structure which has been replaced
59 by a pa-va search library. This structure was earlier being used for holding
60 memory segments used by dpaa2 driver for faster pa->va translation. This
61 structure would be made internal (or removed if all dependencies are cleared)
64 * net: The Ethernet address and header definitions will change
65 attributes. The Ethernet address struct will no longer be marked as
66 packed since the packed attribute is meaningless on a byte
67 array. The Ethernet header will be marked as aligned on a 2-byte
68 boundary and will no longer have the packed attribute. This allows
69 for efficient access on CPU architectures where unaligned access is
70 expensive. These changes should not impact normal usage because drivers
71 naturally align the Ethernet header on receive and all known
72 encapsulations preserve the alignment of the header.
74 * ethdev: The function ``rte_eth_dev_count`` will be removed in DPDK 20.02.
75 It is replaced by the function ``rte_eth_dev_count_avail``.
76 If the intent is to iterate over ports, ``RTE_ETH_FOREACH_*`` macros
77 are better port iterators.
79 * ethdev: the legacy filter API, including
80 ``rte_eth_dev_filter_supported()``, ``rte_eth_dev_filter_ctrl()`` as well
81 as filter types MACVLAN, ETHERTYPE, FLEXIBLE, SYN, NTUPLE, TUNNEL, FDIR,
82 HASH and L2_TUNNEL, is superseded by the generic flow API (rte_flow) in
83 PMDs that implement the latter.
84 Target release for removal of the legacy API will be defined once most
85 PMDs have switched to rte_flow.
87 * ethdev: Update API functions returning ``void`` to return ``int`` with
88 negative errno values to indicate various error conditions (e.g.
89 invalid port ID, unsupported operation, failed operation):
91 - ``rte_eth_dev_stop``
92 - ``rte_eth_dev_close``
94 * ethdev: New offload flags ``DEV_RX_OFFLOAD_RSS_HASH`` and
95 ``DEV_RX_OFFLOAD_FLOW_MARK`` will be added in 19.11.
96 This will allow application to enable or disable PMDs from updating
97 ``rte_mbuf::hash::rss`` and ``rte_mbuf::hash::fdir`` respectively.
98 This scheme will allow PMDs to avoid writes to ``rte_mbuf`` fields on Rx and
99 thereby improve Rx performance if application wishes do so.
100 In 19.11 PMDs will still update the fields even when the offloads are not
103 * ethdev: New function ``rte_eth_dev_set_supported_ptypes`` will be added in
105 This will allow application to request PMD to set specific ptypes defined
106 through ``rte_eth_dev_set_supported_ptypes`` in ``rte_mbuf::packet_type``.
107 If application doesn't want any ptype information it can call
108 ``rte_eth_dev_set_supported_ptypes(ethdev_id, RTE_PTYPE_UNKNOWN)`` and PMD
109 will set ``rte_mbuf::packet_type`` to ``0``.
110 If application doesn't call ``rte_eth_dev_set_supported_ptypes`` PMD can
111 return ``rte_mbuf::packet_type`` with ``rte_eth_dev_get_supported_ptypes``.
112 If application is interested only in L2/L3 layer, it can inform the PMD
113 to update ``rte_mbuf::packet_type`` with L2/L3 ptype by calling
114 ``rte_eth_dev_set_supported_ptypes(ethdev_id, RTE_PTYPE_L2_MASK | RTE_PTYPE_L3_MASK)``.
115 This scheme will allow PMDs to avoid lookup to internal ptype table on Rx and
116 thereby improve Rx performance if application wishes do so.
118 * ethdev: New 32-bit fields may be added for maximum LRO session size, in
119 struct ``rte_eth_dev_info`` for the port capability and in struct
120 ``rte_eth_rxmode`` for the port configuration.
122 * cryptodev: support for using IV with all sizes is added, J0 still can
123 be used but only when IV length in following structs ``rte_crypto_auth_xform``,
124 ``rte_crypto_aead_xform`` is set to zero. When IV length is greater or equal
125 to one it means it represents IV, when is set to zero it means J0 is used
126 directly, in this case 16 bytes of J0 need to be passed.
128 * sched: To allow more traffic classes, flexible mapping of pipe queues to
129 traffic classes, and subport level configuration of pipes and queues
130 changes will be made to macros, data structures and API functions defined
131 in "rte_sched.h". These changes are aligned to improvements suggested in the
132 RFC https://mails.dpdk.org/archives/dev/2018-November/120035.html.
134 * metrics: The function ``rte_metrics_init`` will have a non-void return
135 in order to notify errors instead of calling ``rte_exit``.
137 * power: ``rte_power_set_env`` function will no longer return 0 on attempt
138 to set new power environment if power environment was already initialized.
139 In this case the function will return -1 unless the environment is unset first
140 (using ``rte_power_unset_env``). Other function usage scenarios will not change.