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.Dd December 1, 2018 .Dt ENA 4 .Os .Sh NAME .Nm ena .Nd NetBSD kernel driver for Elastic Network Adapter (ENA) family .Sh SYNOPSIS .Cd "ena* at pci? dev ? function ?" .Sh DESCRIPTION The ENA is a networking interface designed to make good use of modern CPU features and system architectures.
p The ENA device exposes a lightweight management interface with a minimal set of memory mapped registers and extendable command set through an Admin Queue.
p The driver supports a range of ENA devices, is link-speed independent (i.e., the same driver is used for 10GbE, 25GbE, 40GbE, etc.), and has a negotiated and extendable feature set.
p Some ENA devices support SR-IOV. This driver is used for both the SR-IOV Physical Function (PF) and Virtual Function (VF) devices.
p The ENA devices enable high speed and low overhead network traffic processing by providing multiple Tx/Rx queue pairs (the maximum number is advertised by the device via the Admin Queue), a dedicated MSI-X interrupt vector per Tx/Rx queue pair, and CPU cacheline optimized data placement.
p The .Nm driver supports industry standard TCP/IP offload features such as checksum offload and TCP transmit segmentation offload (TSO). Receive-side scaling (RSS) is supported for multi-core scaling.
p The .Nm driver and its corresponding devices implement health monitoring mechanisms such as watchdog, enabling the device and driver to recover in a manner transparent to the application, as well as debug logs.
p Some of the ENA devices support a working mode called Low-latency Queue (LLQ), which saves several more microseconds. This feature might be implemented for the driver in future releases. .Sh HARDWARE Supported PCI vendor ID/device IDs:
p l -bullet -compact t 1d0f:0ec2 - ENA PF t 1d0f:1ec2 - ENA PF with LLQ support t 1d0f:ec20 - ENA VF t 1d0f:ec21 - ENA VF with LLQ support .El .Sh SEE ALSO .Xr arp 4 , .Xr ifmedia 4 , .Xr netintro 4 , .Xr pci 4 , .Xr ifconfig 8 .Sh AUTHORS .An -nosplit The .Nm driver was originally written by .An Semihalf for .Fx . The driver was ported to .Nx by .An Jared D. McNeill Aq Mt jmcneill (at] NetBSD.org .
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