This section describes hardware features and capabilities. Please refer to the relevant driver
and/or firmware release notes for feature availability.
Features and Benefits
Feature
Description
PCI Express (PCIe)
Uses PCIe Gen 3.0 (8GT/s) through an x8 or x16 edge connector. Gen
1.1 and 2.0 compatible.
Up to 25 Gigabit Ethernet Mellanox adapters comply with the following IEEE 802.3 standards:
•
100GbE/ 50GbE / 40GbE / 25GbE / 10GbE / 1GbE
•
IEEE 802.3bj, 802.3bm 100 Gigabit Ethernet
•
IEEE 802.3by, Ethernet Consortium25, 50 Gigabit Ethernet,
supporting all FEC modes
•
IEEE 802.3ba 40 Gigabit Ethernet
•
IEEE 802.3by 25 Gigabit Ethernet
•
IEEE 802.3ae 10 Gigabit Ethernet
•
IEEE 802.3ap based auto-negotiation and KR startup
•
Proprietary Ethernet protocols (20/40GBASE-R2, 50GBASE-R4)
•
IEEE 802.3ad, 802.1AX Link Aggregation
•
IEEE 802.1Q, 802.1P VLAN tags and priority
•
IEEE 802.1Qau (QCN)
•
Congestion Notification
•
IEEE 802.1Qaz (ETS)
•
IEEE 802.1Qbb (PFC)
•
IEEE 802.1Qbg
•
IEEE 1588v2
•
Jumbo frame support (9.6KB)
Memory
•
PCI Express - stores and accesses Ethernet fabric
connection information and packet data.
•
SPI Quad - includes 128Mbit SPI Quad Flash device
(W25Q128FVSIG device by ST Microelectronics).
•
FRU EEPROM - Stores the parameters and personality of the
card. The EEPROM capacity is 128Kbit. FRU I2C address is
(0x50) and is accessible through the PCIe SMBus. (Available
in QSFP28 OPNs)
Overlay Networks
In order to better scale their networks, data center operators often
create overlay networks that carry traffic from individual virtual
machines over logical tunnels in encapsulated formats such as
NVGRE and VXLAN. While this solves network scalability issues, it
hides the TCP packet from the hardware offloading engines, placing
higher loads on the host CPU. ConnectX-5 effectively addresses this
by providing advanced NVGRE and VXLAN hardware offloading
engines that encapsulate and de-capsulate the overlay protocol.
RDMA and RDMA over Converged
Ethernet (RoCE)
ConnectX-5, utilizing IBTA RDMA (Remote Data Memory Access) and
RoCE (RDMA over Converged Ethernet) technology, delivers low-
latency and high-performance over Band and Ethernet networks.
Leveraging data center bridging (DCB) capabilities as well as
ConnectX-5 advanced congestion control hardware mechanisms,
RoCE provides efficient low-latency RDMA services over Layer 2 and
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