Commit c452f375 authored by Shay Agroskin's avatar Shay Agroskin Committed by David S. Miller
Browse files

net: ena: update ena documentation 



The PCI vendor IDs in the documentation inaccurately describe the ENA
devices. For example, the 1d0f:ec20 can have LLQ support. The driver
loads in LLQ mode by default, and a message is printed to the kernel
ring if the mode isn't supported by the device, so the device table
isn't needed.

Also, LLQ can support various entry sizes, so the documentation is
updated to reflect that.

Interrupt moderation description is also updated to be more accurate.

Signed-off-by: default avatarShay Agroskin <shayagr@amazon.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f49ed500

Documentation/networking/device_drivers/ethernet/amazon/ena.rst

+2 −21
Original line number Diff line number Diff line
@@ -39,16 +39,6 @@ debug logs. 
Some of the ENA devices support a working mode called Low-latency

Queue (LLQ), which saves several more microseconds.



Supported PCI vendor ID/device IDs

==================================



=========   =======================

1d0f:0ec2   ENA PF

1d0f:1ec2   ENA PF with LLQ support

1d0f:ec20   ENA VF

1d0f:ec21   ENA VF with LLQ support

=========   =======================



ENA Source Code Directory Structure

===================================
@@ -212,20 +202,11 @@ In adaptive interrupt moderation mode the interrupt delay value is 
updated by the driver dynamically and adjusted every NAPI cycle

according to the traffic nature.



By default ENA driver applies adaptive coalescing on Rx traffic and

conventional coalescing on Tx traffic.



Adaptive coalescing can be switched on/off through ethtool(8)

adaptive_rx on|off parameter.



The driver chooses interrupt delay value according to the number of

bytes and packets received between interrupt unmasking and interrupt

posting. The driver uses interrupt delay table that subdivides the

range of received bytes/packets into 5 levels and assigns interrupt

delay value to each level.



The user can enable/disable adaptive moderation, modify the interrupt

delay table and restore its default values through sysfs.

More information about Adaptive Interrupt Moderation (DIM) can be found in

Documentation/networking/net_dim.rst



RX copybreak

============