191 lines
6.6 KiB
Plaintext
191 lines
6.6 KiB
Plaintext
Linux Base Driver for the Intel(R) Ethernet Controller XL710 Family
|
|
===================================================================
|
|
|
|
Intel i40e Linux driver.
|
|
Copyright(c) 2013 Intel Corporation.
|
|
|
|
Contents
|
|
========
|
|
|
|
- Identifying Your Adapter
|
|
- Additional Configurations
|
|
- Performance Tuning
|
|
- Known Issues
|
|
- Support
|
|
|
|
|
|
Identifying Your Adapter
|
|
========================
|
|
|
|
The driver in this release is compatible with the Intel Ethernet
|
|
Controller XL710 Family.
|
|
|
|
For more information on how to identify your adapter, go to the Adapter &
|
|
Driver ID Guide at:
|
|
|
|
http://support.intel.com/support/network/sb/CS-012904.htm
|
|
|
|
|
|
Enabling the driver
|
|
===================
|
|
|
|
The driver is enabled via the standard kernel configuration system,
|
|
using the make command:
|
|
|
|
Make oldconfig/silentoldconfig/menuconfig/etc.
|
|
|
|
The driver is located in the menu structure at:
|
|
|
|
-> Device Drivers
|
|
-> Network device support (NETDEVICES [=y])
|
|
-> Ethernet driver support
|
|
-> Intel devices
|
|
-> Intel(R) Ethernet Controller XL710 Family
|
|
|
|
Additional Configurations
|
|
=========================
|
|
|
|
Generic Receive Offload (GRO)
|
|
-----------------------------
|
|
The driver supports the in-kernel software implementation of GRO. GRO has
|
|
shown that by coalescing Rx traffic into larger chunks of data, CPU
|
|
utilization can be significantly reduced when under large Rx load. GRO is
|
|
an evolution of the previously-used LRO interface. GRO is able to coalesce
|
|
other protocols besides TCP. It's also safe to use with configurations that
|
|
are problematic for LRO, namely bridging and iSCSI.
|
|
|
|
Ethtool
|
|
-------
|
|
The driver utilizes the ethtool interface for driver configuration and
|
|
diagnostics, as well as displaying statistical information. The latest
|
|
ethtool version is required for this functionality.
|
|
|
|
The latest release of ethtool can be found from
|
|
https://www.kernel.org/pub/software/network/ethtool
|
|
|
|
|
|
Flow Director n-ntuple traffic filters (FDir)
|
|
---------------------------------------------
|
|
The driver utilizes the ethtool interface for configuring ntuple filters,
|
|
via "ethtool -N <device> <filter>".
|
|
|
|
The sctp4, ip4, udp4, and tcp4 flow types are supported with the standard
|
|
fields including src-ip, dst-ip, src-port and dst-port. The driver only
|
|
supports fully enabling or fully masking the fields, so use of the mask
|
|
fields for partial matches is not supported.
|
|
|
|
Additionally, the driver supports using the action to specify filters for a
|
|
Virtual Function. You can specify the action as a 64bit value, where the
|
|
lower 32 bits represents the queue number, while the next 8 bits represent
|
|
which VF. Note that 0 is the PF, so the VF identifier is offset by 1. For
|
|
example:
|
|
|
|
... action 0x800000002 ...
|
|
|
|
Would indicate to direct traffic for Virtual Function 7 (8 minus 1) on queue
|
|
2 of that VF.
|
|
|
|
The driver also supports using the user-defined field to specify 2 bytes of
|
|
arbitrary data to match within the packet payload in addition to the regular
|
|
fields. The data is specified in the lower 32bits of the user-def field in
|
|
the following way:
|
|
|
|
+----------------------------+---------------------------+
|
|
| 31 28 24 20 16 | 15 12 8 4 0|
|
|
+----------------------------+---------------------------+
|
|
| offset into packet payload | 2 bytes of flexible data |
|
|
+----------------------------+---------------------------+
|
|
|
|
As an example,
|
|
|
|
... user-def 0x4FFFF ....
|
|
|
|
means to match the value 0xFFFF 4 bytes into the packet payload. Note that
|
|
the offset is based on the beginning of the payload, and not the beginning
|
|
of the packet. Thus
|
|
|
|
flow-type tcp4 ... user-def 0x8BEAF ....
|
|
|
|
would match TCP/IPv4 packets which have the value 0xBEAF 8bytes into the
|
|
TCP/IPv4 payload.
|
|
|
|
For ICMP, the hardware parses the ICMP header as 4 bytes of header and 4
|
|
bytes of payload, so if you want to match an ICMP frames payload you may need
|
|
to add 4 to the offset in order to match the data.
|
|
|
|
Furthermore, the offset can only be up to a value of 64, as the hardware
|
|
will only read up to 64 bytes of data from the payload. It must also be even
|
|
as the flexible data is 2 bytes long and must be aligned to byte 0 of the
|
|
packet payload.
|
|
|
|
When programming filters, the hardware is limited to using a single input
|
|
set for each flow type. This means that it is an error to program two
|
|
different filters with the same type that don't match on the same fields.
|
|
Thus the second of the following two commands will fail:
|
|
|
|
ethtool -N <device> flow-type tcp4 src-ip 192.168.0.7 action 5
|
|
ethtool -N <device> flow-type tcp4 dst-ip 192.168.15.18 action 1
|
|
|
|
This is because the first filter will be accepted and reprogram the input
|
|
set for TCPv4 filters, but the second filter will be unable to reprogram the
|
|
input set until all the conflicting TCPv4 filters are first removed.
|
|
|
|
Note that the user-defined flexible offset is also considered part of the
|
|
input set and cannot be programmed separately for multiple filters of the
|
|
same type. However, the flexible data is not part of the input set and
|
|
multiple filters may use the same offset but match against different data.
|
|
|
|
Data Center Bridging (DCB)
|
|
--------------------------
|
|
DCB configuration is not currently supported.
|
|
|
|
FCoE
|
|
----
|
|
The driver supports Fiber Channel over Ethernet (FCoE) and Data Center
|
|
Bridging (DCB) functionality. Configuring DCB and FCoE is outside the scope
|
|
of this driver doc. Refer to http://www.open-fcoe.org/ for FCoE project
|
|
information and http://www.open-lldp.org/ or email list
|
|
e1000-eedc@lists.sourceforge.net for DCB information.
|
|
|
|
MAC and VLAN anti-spoofing feature
|
|
----------------------------------
|
|
When a malicious driver attempts to send a spoofed packet, it is dropped by
|
|
the hardware and not transmitted. An interrupt is sent to the PF driver
|
|
notifying it of the spoof attempt.
|
|
|
|
When a spoofed packet is detected the PF driver will send the following
|
|
message to the system log (displayed by the "dmesg" command):
|
|
|
|
Spoof event(s) detected on VF (n)
|
|
|
|
Where n=the VF that attempted to do the spoofing.
|
|
|
|
|
|
Performance Tuning
|
|
==================
|
|
|
|
An excellent article on performance tuning can be found at:
|
|
|
|
http://www.redhat.com/promo/summit/2008/downloads/pdf/Thursday/Mark_Wagner.pdf
|
|
|
|
|
|
Known Issues
|
|
============
|
|
|
|
|
|
Support
|
|
=======
|
|
|
|
For general information, go to the Intel support website at:
|
|
|
|
http://support.intel.com
|
|
|
|
or the Intel Wired Networking project hosted by Sourceforge at:
|
|
|
|
http://e1000.sourceforge.net
|
|
|
|
If an issue is identified with the released source code on the supported
|
|
kernel with a supported adapter, email the specific information related
|
|
to the issue to e1000-devel@lists.sourceforge.net and copy
|
|
netdev@vger.kernel.org.
|