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freebsd-skq/sys/dev/ixgb/README
Gleb Smirnoff 4092996774 Big polling(4) cleanup. 
o Axe poll in trap.

o Axe IFF_POLLING flag from if_flags.

o Rework revision 1.21 (Giant removal), in such a way that
  poll_mtx is not dropped during call to polling handler.
  This fixes problem with idle polling.

o Make registration and deregistration from polling in a
  functional way, insted of next tick/interrupt.

o Obsolete kern.polling.enable. Polling is turned on/off
  with ifconfig.

Detailed kern_poll.c changes:
  - Remove polling handler flags, introduced in 1.21. The are not
    needed now.
  - Forget and do not check if_flags, if_capenable and if_drv_flags.
  - Call all registered polling handlers unconditionally.
  - Do not drop poll_mtx, when entering polling handlers.
  - In ether_poll() NET_LOCK_GIANT prior to locking poll_mtx.
  - In netisr_poll() axe the block, where polling code asks drivers
    to unregister.
  - In netisr_poll() and ether_poll() do polling always, if any
    handlers are present.
  - In ether_poll_[de]register() remove a lot of error hiding code. Assert
    that arguments are correct, instead.
  - In ether_poll_[de]register() use standard return values in case of
    error or success.
  - Introduce poll_switch() that is a sysctl handler for kern.polling.enable.
    poll_switch() goes through interface list and enabled/disables polling.
    A message that kern.polling.enable is deprecated is printed.

Detailed driver changes:
  - On attach driver announces IFCAP_POLLING in if_capabilities, but
    not in if_capenable.
  - On detach driver calls ether_poll_deregister() if polling is enabled.
  - In polling handler driver obtains its lock and checks IFF_DRV_RUNNING
    flag. If there is no, then unlocks and returns.
  - In ioctl handler driver checks for IFCAP_POLLING flag requested to
    be set or cleared. Driver first calls ether_poll_[de]register(), then
    obtains driver lock and [dis/en]ables interrupts.
  - In interrupt handler driver checks IFCAP_POLLING flag in if_capenable.
    If present, then returns.This is important to protect from spurious
    interrupts.

Reviewed by:	ru, sam, jhb
2005-10-01 18:56:19 +00:00

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/*$FreeBSD$*/
FreeBSD Driver for Intel(R) PRO/10GbE Server Adapters
=====================================================
March 10, 2004
Contents
========
- Overview
- Supported Adapters
- Building and Installation
- Additional Configurations
Overview
========
This file describes the FreeBSD* driver, version 1.0.x, for the Intel(R)
PRO/10GbE Family of Adapters. This driver has been developed for use with
FreeBSD, version 4.8 and later.
For questions related to hardware requirements, refer to the documentation
supplied with your Intel PRO/10GbE adapter. All hardware requirements listed
apply to use with FreeBSD.
Supported Adapters
==================
The following Intel network adapters are compatible with the drivers in this
release:
Controller Adapter Name Physical Layer
---------- ------------ --------------
82597EX PRO/10GbE LR/SR Server Adapter 10G Base -LR and -SR
850 and 1310 nm optical fiber
Building and Installation
=========================
NOTE: You must have kernel sources installed in order to compile the driver
module.
In the instructions below, x.x.x is the driver version as indicated in
the name of the driver tar.
1. Move the base driver tar file to the directory of your choice. For
example, use /home/username/ixgb or /usr/local/src/ixgb.
2. Untar/unzip the archive:
tar xfz ixgb-x.x.x.tar.gz
3. To install man page:
cd ixgb-x.x.x
gzip -c ixgb.4 > /usr/share/man/man4/ixgb.4.gz
4. To load the driver onto a running system:
cd ixgb-x.x.x/src
make load
5. To assign an IP address to the interface, enter the following:
ifconfig ixgb<interface_num> <IP_address>
6. Verify that the interface works. Enter the following, where <IP_address>
is the IP address for another machine on the same subnet as the interface
that is being tested:
ping <IP_address>
7. If you want the driver to load automatically when the system is booted:
cd ixgb-x.x.x/src
make load
cp if_ixgb.ko /modules
Edit /boot/loader.conf, and add the following line:
if_ixgb_load="YES"
OR
compile the driver into the kernel (see item 7).
Edit /etc/rc.conf, and create the appropriate ifconfig_ixgb<interface_num>
entry:
ifconfig_ixgb<interface_num>="<ifconfig_settings>"
Example usage:
ifconfig_ixgb0="inet 192.168.10.1 netmask 255.255.255.0"
NOTE: For assistance, see the ifconfig man page.
8. If you want to compile the driver into the kernel, enter:
cd ixgb-x.x.x/src
mkdir /usr/src/sys/dev/ixgb
cp if_ixgb* /usr/src/sys/dev/ixgb
cp ixgb* /usr/src/sys/dev/ixgb
cp Makefile.kernel /usr/src/sys/modules/ixgb/Makefile
If you have an i386 platform, you will need to edit the files.i386 file.
This is usually in /usr/src/sys/conf/; actual locations wil vary depending
on platform. Add the following lines:
dev/ixgb/ixgb_hw.c optional ixgb
dev/ixgb/ixgb_ee.c optional ixgb
dev/ixgb/if_ixgb.c optional ixgb
Remove the following lines from the files.i386 file, if they exist:
/dev/ixgb/if_ixgb_fx_hw.c optional ixgb
/dev/ixgb/if_ixgb_phy.c optional ixgb
Edit the kernel configuration file (i.e., GENERIC or MYKERNEL) in
/usr/src/sys/i386/conf, and ensure the following line is present:
device ixgb
Compile and install the kernel. The system must be reboot for the kernel
updates to take affect. For additional information on compiling the kernel,
consult the FreeBSD operating system documentation.
Additional Configurations
=========================
The driver supports Transmit/Receive Checksum Offload and Jumbo Frames on
all PRO/10GbE adapters.
Jumbo Frames
------------
To enable Jumbo Frames, use the ifconfig utility to increase the MTU
beyond 1500 bytes.
NOTES:
- Only enable Jumbo Frames if your network infrastructure supports
them.
- The Jumbo Frames setting on the switch must be set to at least
22 bytes larger than that of the adapter.
- There are known performance issues with this driver when running
UDP traffic with Jumbo Frames.
The Jumbo Frames MTU range for Intel Adapters is 1500 to 16114. The default
MTU range is 1500. To modify the setting, enter the following:
ifconfig ixgb<interface_num> <hostname or IP address> mtu 9000
To confirm an interface's MTU value, use the ifconfig command. To confirm
the MTU used between two specific devices, use:
route get <destination_IP_address>
VLANs
-----
To create a new VLAN pseudo-interface:
ifconfig <vlan_name> create
To associate the VLAN pseudo-interface with a physical interface and
assign a VLAN ID, IP address, and netmask:
ifconfig <vlan_name> <ip_address> netmask <subnet_mask> vlan
<vlan_id> vlandev <physical_interface>
Example:
ifconfig vlan10 10.0.0.1 netmask 255.255.255.0 vlan10 vlandev ixgb0
In this example, all packets will be marked on egress with 802.1Q VLAN
tags, specifying a VLAN ID of 10.
To remove a VLAN pseudo-interface:
ifconfig <vlan_name> destroy
Polling
-------
To enable polling in the driver, add the following options to the kernel
configuration, and then recompile the kernel:
options DEVICE_POLLING
options HZ=1000
At runtime, use the following command to turn on polling mode.
ifconfig ixgb0 polling
Similarly, turn off polling mode by removing IFCAP_POLLING flag from
interface:
ifconfig ixgb0 -polling
The driver has to be built into the kernel for DEVICE POLLING to be
enabled in the driver.
Support
=======
For general information and support, go to the Intel support website at:
http://support.intel.com
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 freebsdnic@mailbox.intel.com.
License
=======
This software program is released under the terms of a license agreement
between you ('Licensee') and Intel. Do not use or load this software or any
associated materials (collectively, the 'Software') until you have carefully
read the full terms and conditions of the LICENSE located in this software
package. By loading or using the Software, you agree to the terms of this
Agreement. If you do not agree with the terms of this Agreement, do not
install or use the Software.
* Other names and brands may be claimed as the property of others.
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