- Multi arch support: x86_64, POWER8, ARMv8, i686.
- Multiple TX and RX queues.
+- Shared Rx queue.
+- Rx queue delay drop.
- Support for scattered TX frames.
- Advanced support for scattered Rx frames with tunable buffer attributes.
- IPv4, IPv6, TCPv4, TCPv6, UDPv4 and UDPv6 RSS on any number of queues.
- Flow integrity offload API.
- Connection tracking.
- Sub-Function representors.
+- Sub-Function.
+
Limitations
-----------
process. If the external memory is registered by primary process but has
different virtual address in secondary process, unexpected error may happen.
+- Shared Rx queue:
+
+ - Counters of received packets and bytes number of devices in same share group are same.
+ - Counters of received packets and bytes number of queues in same group and queue ID are same.
+
- When using Verbs flow engine (``dv_flow_en`` = 0), flow pattern without any
specific VLAN will match for VLAN packets as well:
Last reserved 8-bits matching is only supported When using DV flow
engine (``dv_flow_en`` = 1).
+ For ConnectX-5, the UDP destination port must be the standard one (4789).
Group zero's behavior may differ which depends on FW.
Matching value equals 0 (value & mask) is not supported.
extension header type = 0x85).
- Match on GTP extension header is not supported in group 0.
+- Flex item:
+
+ - Hardware support: BlueField 2.
+ - Flex item is supported on PF only.
+ - Hardware limits ``header_length_mask_width`` up to 6 bits.
+ - Firmware supports 8 global sample fields.
+ Each flex item allocates non-shared sample fields from that pool.
+ - Supported flex item can have 1 input link - ``eth`` or ``udp``
+ and up to 2 output links - ``ipv4`` or ``ipv6``.
+ - Flex item fields (``next_header``, ``next_protocol``, ``samples``)
+ do not participate in RSS hash functions.
+ - In flex item configuration, ``next_header.field_base`` value
+ must be byte aligned (multiple of 8).
+
- No Tx metadata go to the E-Switch steering domain for the Flow group 0.
The flows within group 0 and set metadata action are rejected by hardware.
no MPRQ feature or vectorized code can be engaged.
- When Multi-Packet Rx queue is configured (``mprq_en``), a Rx packet can be
- externally attached to a user-provided mbuf with having EXT_ATTACHED_MBUF in
+ externally attached to a user-provided mbuf with having RTE_MBUF_F_EXTERNAL in
ol_flags. As the mempool for the external buffer is managed by PMD, all the
Rx mbufs must be freed before the device is closed. Otherwise, the mempool of
the external buffers will be freed by PMD and the application which still
- If Multi-Packet Rx queue is configured (``mprq_en``) and Rx CQE compression is
enabled (``rxq_cqe_comp_en``) at the same time, RSS hash result is not fully
- supported. Some Rx packets may not have PKT_RX_RSS_HASH.
+ supported. Some Rx packets may not have RTE_MBUF_F_RX_RSS_HASH.
- IPv6 Multicast messages are not supported on VM, while promiscuous mode
and allmulticast mode are both set to off.
- CRC:
- - ``DEV_RX_OFFLOAD_KEEP_CRC`` cannot be supported with decapsulation
+ - ``RTE_ETH_RX_OFFLOAD_KEEP_CRC`` cannot be supported with decapsulation
for some NICs (such as ConnectX-6 Dx, ConnectX-6 Lx, and BlueField-2).
The capability bit ``scatter_fcs_w_decap_disable`` shows NIC support.
- Meter:
- All the meter colors with drop action will be counted only by the global drop statistics.
- - Green color is not supported with drop action.
- - Yellow detection is not supported.
+ - Yellow detection is only supported with ASO metering.
- Red color must be with drop action.
- Meter statistics are supported only for drop case.
- - Meter yellow color detection is not supported.
- A meter action created with pre-defined policy must be the last action in the flow except single case where the policy actions are:
- green: NULL or END.
- yellow: NULL or END.
- RED: DROP / END.
- The only supported meter policy actions:
- - green: QUEUE, RSS, PORT_ID, JUMP, MARK and SET_TAG.
- - yellow: must be empty.
+ - green: QUEUE, RSS, PORT_ID, REPRESENTED_PORT, JUMP, DROP, MARK and SET_TAG.
+ - yellow: QUEUE, RSS, PORT_ID, REPRESENTED_PORT, JUMP, DROP, MARK and SET_TAG.
- RED: must be DROP.
+ - Policy actions of RSS for green and yellow should have the same configuration except queues.
+ - Policy with RSS/queue action is not supported when ``dv_xmeta_en`` enabled.
- meter profile packet mode is supported.
+ - meter profiles of RFC2697, RFC2698 and RFC4115 are supported.
- Integrity:
- In order to achieve best insertion rate, application should manage the flows per lcore.
- Better to disable memory reclaim by setting ``reclaim_mem_mode`` to 0 to accelerate the flow object allocation and release with cache.
+- HW hashed bonding
+
+ - TXQ affinity subjects to HW hash once enabled.
+
+- Bonding under socket direct mode
+
+ - Needs OFED 5.4+.
+
+- Timestamps:
+
+ - CQE timestamp field width is limited by hardware to 63 bits, MSB is zero.
+ - In the free-running mode the timestamp counter is reset on power on
+ and 63-bit value provides over 1800 years of uptime till overflow.
+ - In the real-time mode
+ (configurable with ``REAL_TIME_CLOCK_ENABLE`` firmware settings),
+ the timestamp presents the nanoseconds elapsed since 01-Jan-1970,
+ hardware timestamp overflow will happen on 19-Jan-2038
+ (0x80000000 seconds since 01-Jan-1970).
+ - The send scheduling is based on timestamps
+ from the reference "Clock Queue" completions,
+ the scheduled send timestamps should not be specified with non-zero MSB.
+
Statistics
----------
- POWER8 and ARMv8 with ConnectX-4 Lx, ConnectX-5, ConnectX-6, ConnectX-6 Dx,
ConnectX-6 Lx, BlueField and BlueField-2.
+- ``delay_drop`` parameter [int]
+
+ Bitmask value for the Rx queue delay drop attribute. Bit 0 is used for the
+ standard Rx queue and bit 1 is used for the hairpin Rx queue. By default, the
+ delay drop is disabled for all Rx queues. It will be ignored if the port does
+ not support the attribute even if it is enabled explicitly.
+
+ The packets being received will not be dropped immediately when the WQEs are
+ exhausted in a Rx queue with delay drop enabled.
+
+ A timeout value is set in the driver to control the waiting time before
+ dropping a packet. Once the timer is expired, the delay drop will be
+ deactivated for all the Rx queues with this feature enable. To re-activeate
+ it, a rearming is needed and it is part of the kernel driver starting from
+ OFED 5.5.
+
+ To enable / disable the delay drop rearming, the private flag ``dropless_rq``
+ can be set and queried via ethtool:
+
+ - ethtool --set-priv-flags <netdev> dropless_rq on (/ off)
+ - ethtool --show-priv-flags <netdev>
+
+ The configuration flag is global per PF and can only be set on the PF, once
+ it is on, all the VFs', SFs' and representors' Rx queues will share the timer
+ and rearming.
+
- ``mprq_en`` parameter [int]
A nonzero value enables configuring Multi-Packet Rx queues. Rx queue is
and each stride receives one packet. MPRQ can improve throughput for
small-packet traffic.
- When MPRQ is enabled, max_rx_pkt_len can be larger than the size of
- user-provided mbuf even if DEV_RX_OFFLOAD_SCATTER isn't enabled. PMD will
- configure large stride size enough to accommodate max_rx_pkt_len as long as
+ When MPRQ is enabled, MTU can be larger than the size of
+ user-provided mbuf even if RTE_ETH_RX_OFFLOAD_SCATTER isn't enabled. PMD will
+ configure large stride size enough to accommodate MTU as long as
device allows. Note that this can waste system memory compared to enabling Rx
scatter and multi-segment packet.
the mbuf by external buffer attachment - ``rte_pktmbuf_attach_extbuf()``.
A mempool for external buffers will be allocated and managed by PMD. If Rx
packet is externally attached, ol_flags field of the mbuf will have
- EXT_ATTACHED_MBUF and this flag must be preserved. ``RTE_MBUF_HAS_EXTBUF()``
+ RTE_MBUF_F_EXTERNAL and this flag must be preserved. ``RTE_MBUF_HAS_EXTBUF()``
checks the flag. The default value is 128, valid only if ``mprq_en`` is set.
- ``rxqs_min_mprq`` parameter [int]
Enabled by default.
+- ``mr_mempool_reg_en`` parameter [int]
+
+ A nonzero value enables implicit registration of DMA memory of all mempools
+ except those having ``RTE_MEMPOOL_F_NON_IO``. This flag is set automatically
+ for mempools populated with non-contiguous objects or those without IOVA.
+ The effect is that when a packet from a mempool is transmitted,
+ its memory is already registered for DMA in the PMD and no registration
+ will happen on the data path. The tradeoff is extra work on the creation
+ of each mempool and increased HW resource use if some mempools
+ are not used with MLX5 devices.
+
+ Enabled by default.
+
- ``representor`` parameter [list]
This parameter can be used to instantiate DPDK Ethernet devices from
FLEX_PARSER_PROFILE_ENABLE=4
PROG_PARSE_GRAPH=1
+- enable dynamic flex parser for flex item::
+
+ FLEX_PARSER_PROFILE_ENABLE=4
+ PROG_PARSE_GRAPH=1
+
+- enable realtime timestamp format::
+
+ REAL_TIME_CLOCK_ENABLE=1
+
Linux Prerequisites
-------------------
echo -n "<device pci address" > /sys/bus/pci/drivers/mlx5_core/unbind
-5. Enbale switchdev mode::
+5. Enable switchdev mode::
echo switchdev > /sys/class/net/<net device>/compat/devlink/mode
-Sub-Function representor
-------------------------
+Sub-Function support
+--------------------
Sub-Function is a portion of the PCI device, a SF netdev has its own
-dedicated queues(txq, rxq). A SF netdev supports E-Switch representation
-offload similar to existing PF and VF representors. A SF shares PCI
-level resources with other SFs and/or with its parent PCI function.
+dedicated queues (txq, rxq).
+A SF shares PCI level resources with other SFs and/or with its parent PCI function.
+
+0. Requirement::
+
+ OFED version >= 5.4-0.3.3.0
1. Configure SF feature::
- mlxconfig -d <mst device> set PF_BAR2_SIZE=<0/1/2/3> PF_BAR2_ENABLE=1
+ # Run mlxconfig on both PFs on host and ECPFs on BlueField.
+ mlxconfig -d <mst device> set PER_PF_NUM_SF=1 PF_TOTAL_SF=252 PF_SF_BAR_SIZE=12
- Value of PF_BAR2_SIZE:
+2. Enable switchdev mode::
- 0: 8 SFs
- 1: 16 SFs
- 2: 32 SFs
- 3: 64 SFs
+ mlxdevm dev eswitch set pci/<DBDF> mode switchdev
-2. Reset the FW::
+3. Add SF port::
- mlxfwreset -d <mst device> reset
+ mlxdevm port add pci/<DBDF> flavour pcisf pfnum 0 sfnum <sfnum>
-3. Enable switchdev mode::
+ Get SFID from output: pci/<DBDF>/<SFID>
- echo switchdev > /sys/class/net/<net device>/compat/devlink/mode
+4. Modify MAC address::
+
+ mlxdevm port function set pci/<DBDF>/<SFID> hw_addr <MAC>
+
+5. Activate SF port::
+
+ mlxdevm port function set pci/<DBDF>/<ID> state active
-4. Create SF::
+6. Devargs to probe SF device::
- mlnx-sf -d <PCI_BDF> -a create
+ auxiliary:mlx5_core.sf.<num>,dv_flow_en=1
-5. Probe SF representor::
+Sub-Function representor support
+--------------------------------
- testpmd> port attach <PCI_BDF>,representor=sf0,dv_flow_en=1
+A SF netdev supports E-Switch representation offload
+similar to PF and VF representors.
+Use <sfnum> to probe SF representor::
+
+ testpmd> port attach <PCI_BDF>,representor=sf<sfnum>,dv_flow_en=1
Performance tuning
------------------
| | | rdma-core 26 | | rdma-core 26 |
| | | ConnectX-5 | | ConnectX-5 |
+-----------------------+-----------------+-----------------+
+ | ASO Metering | | DPDK 21.05 | | DPDK 21.05 |
+ | | | OFED 5.3 | | OFED 5.3 |
+ | | | rdma-core 33 | | rdma-core 33 |
+ | | | ConnectX-6 Dx| | ConnectX-6 Dx |
+ +-----------------------+-----------------+-----------------+
+ | Metering Hierarchy | | DPDK 21.08 | | DPDK 21.08 |
+ | | | OFED 5.3 | | OFED 5.3 |
+ | | | N/A | | N/A |
+ | | | ConnectX-6 Dx| | ConnectX-6 Dx |
+ +-----------------------+-----------------+-----------------+
| Sampling | | DPDK 20.11 | | DPDK 20.11 |
| | | OFED 5.1-2 | | OFED 5.1-2 |
| | | rdma-core 32 | | N/A |
git.droids-corp.org / dpdk.git / blobdiff