docs: networking: reorganize driver documentation again

Organize driver documentation by device type. Most documents
have fairly verbose yet uninformative names, so let users
first select a well defined device type, and then search for
a particular driver.

While at it rename the section from Vendor drivers to
Hardware drivers. This seems more accurate, besides people
sometimes refer to out-of-tree drivers as vendor drivers.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Acked-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Acked-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 311 insertions, 0 deletions

diff --git a/Documentation/networking/device_drivers/ethernet/neterion/s2io.rst b/Documentation/networking/device_drivers/ethernet/neterion/s2io.rst
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+.. SPDX-License-Identifier: GPL-2.0
+
+=========================================================
+Neterion's (Formerly S2io) Xframe I/II PCI-X 10GbE driver
+=========================================================
+
+Release notes for Neterion's (Formerly S2io) Xframe I/II PCI-X 10GbE driver.
+
+.. Contents
+  - 1.  Introduction
+  - 2.  Identifying the adapter/interface
+  - 3.  Features supported
+  - 4.  Command line parameters
+  - 5.  Performance suggestions
+  - 6.  Available Downloads
+
+
+1. Introduction
+===============
+This Linux driver supports Neterion's Xframe I PCI-X 1.0 and
+Xframe II PCI-X 2.0 adapters. It supports several features
+such as jumbo frames, MSI/MSI-X, checksum offloads, TSO, UFO and so on.
+See below for complete list of features.
+
+All features are supported for both IPv4 and IPv6.
+
+2. Identifying the adapter/interface
+====================================
+
+a. Insert the adapter(s) in your system.
+b. Build and load driver::
+
+	# insmod s2io.ko
+
+c. View log messages::
+
+	# dmesg | tail -40
+
+You will see messages similar to::
+
+	eth3: Neterion Xframe I 10GbE adapter (rev 3), Version 2.0.9.1, Intr type INTA
+	eth4: Neterion Xframe II 10GbE adapter (rev 2), Version 2.0.9.1, Intr type INTA
+	eth4: Device is on 64 bit 133MHz PCIX(M1) bus
+
+The above messages identify the adapter type(Xframe I/II), adapter revision,
+driver version, interface name(eth3, eth4), Interrupt type(INTA, MSI, MSI-X).
+In case of Xframe II, the PCI/PCI-X bus width and frequency are displayed
+as well.
+
+To associate an interface with a physical adapter use "ethtool -p <ethX>".
+The corresponding adapter's LED will blink multiple times.
+
+3. Features supported
+=====================
+a. Jumbo frames. Xframe I/II supports MTU up to 9600 bytes,
+   modifiable using ip command.
+
+b. Offloads. Supports checksum offload(TCP/UDP/IP) on transmit
+   and receive, TSO.
+
+c. Multi-buffer receive mode. Scattering of packet across multiple
+   buffers. Currently driver supports 2-buffer mode which yields
+   significant performance improvement on certain platforms(SGI Altix,
+   IBM xSeries).
+
+d. MSI/MSI-X. Can be enabled on platforms which support this feature
+   (IA64, Xeon) resulting in noticeable performance improvement(up to 7%
+   on certain platforms).
+
+e. Statistics. Comprehensive MAC-level and software statistics displayed
+   using "ethtool -S" option.
+
+f. Multi-FIFO/Ring. Supports up to 8 transmit queues and receive rings,
+   with multiple steering options.
+
+4. Command line parameters
+==========================
+
+a. tx_fifo_num
+	Number of transmit queues
+
+Valid range: 1-8
+
+Default: 1
+
+b. rx_ring_num
+	Number of receive rings
+
+Valid range: 1-8
+
+Default: 1
+
+c. tx_fifo_len
+	Size of each transmit queue
+
+Valid range: Total length of all queues should not exceed 8192
+
+Default: 4096
+
+d. rx_ring_sz
+	Size of each receive ring(in 4K blocks)
+
+Valid range: Limited by memory on system
+
+Default: 30
+
+e. intr_type
+	Specifies interrupt type. Possible values 0(INTA), 2(MSI-X)
+
+Valid values: 0, 2
+
+Default: 2
+
+5. Performance suggestions
+==========================
+
+General:
+
+a. Set MTU to maximum(9000 for switch setup, 9600 in back-to-back configuration)
+b. Set TCP windows size to optimal value.
+
+For instance, for MTU=1500 a value of 210K has been observed to result in
+good performance::
+
+	# sysctl -w net.ipv4.tcp_rmem="210000 210000 210000"
+	# sysctl -w net.ipv4.tcp_wmem="210000 210000 210000"
+
+For MTU=9000, TCP window size of 10 MB is recommended::
+
+	# sysctl -w net.ipv4.tcp_rmem="10000000 10000000 10000000"
+	# sysctl -w net.ipv4.tcp_wmem="10000000 10000000 10000000"
+
+Transmit performance:
+
+a. By default, the driver respects BIOS settings for PCI bus parameters.
+   However, you may want to experiment with PCI bus parameters
+   max-split-transactions(MOST) and MMRBC (use setpci command).
+
+   A MOST value of 2 has been found optimal for Opterons and 3 for Itanium.
+
+   It could be different for your hardware.
+
+   Set MMRBC to 4K**.
+
+   For example you can set
+
+   For opteron::
+
+	#setpci -d 17d5:* 62=1d
+
+   For Itanium::
+
+	#setpci -d 17d5:* 62=3d
+
+   For detailed description of the PCI registers, please see Xframe User Guide.
+
+b. Ensure Transmit Checksum offload is enabled. Use ethtool to set/verify this
+   parameter.
+
+c. Turn on TSO(using "ethtool -K")::
+
+	# ethtool -K <ethX> tso on
+
+Receive performance:
+
+a. By default, the driver respects BIOS settings for PCI bus parameters.
+   However, you may want to set PCI latency timer to 248::
+
+	#setpci -d 17d5:* LATENCY_TIMER=f8
+
+   For detailed description of the PCI registers, please see Xframe User Guide.
+
+b. Use 2-buffer mode. This results in large performance boost on
+   certain platforms(eg. SGI Altix, IBM xSeries).
+
+c. Ensure Receive Checksum offload is enabled. Use "ethtool -K ethX" command to
+   set/verify this option.
+
+d. Enable NAPI feature(in kernel configuration Device Drivers ---> Network
+   device support --->  Ethernet (10000 Mbit) ---> S2IO 10Gbe Xframe NIC) to
+   bring down CPU utilization.
+
+.. note::
+
+   For AMD opteron platforms with 8131 chipset, MMRBC=1 and MOST=1 are
+   recommended as safe parameters.
+
+For more information, please review the AMD8131 errata at
+http://vip.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/
+26310_AMD-8131_HyperTransport_PCI-X_Tunnel_Revision_Guide_rev_3_18.pdf
+
+6. Support
+==========
+
+For further support please contact either your 10GbE Xframe NIC vendor (IBM,
+HP, SGI etc.)
diff --git a/Documentation/networking/device_drivers/ethernet/neterion/vxge.rst b/Documentation/networking/device_drivers/ethernet/neterion/vxge.rst
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@@ -0,0 +1,115 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+==============================================================================
+Neterion's (Formerly S2io) X3100 Series 10GbE PCIe Server Adapter Linux driver
+==============================================================================
+
+.. Contents
+
+  1) Introduction
+  2) Features supported
+  3) Configurable driver parameters
+  4) Troubleshooting
+
+1. Introduction
+===============
+
+This Linux driver supports all Neterion's X3100 series 10 GbE PCIe I/O
+Virtualized Server adapters.
+
+The X3100 series supports four modes of operation, configurable via
+firmware:
+
+	- Single function mode
+	- Multi function mode
+	- SRIOV mode
+	- MRIOV mode
+
+The functions share a 10GbE link and the pci-e bus, but hardly anything else
+inside the ASIC. Features like independent hw reset, statistics, bandwidth/
+priority allocation and guarantees, GRO, TSO, interrupt moderation etc are
+supported independently on each function.
+
+(See below for a complete list of features supported for both IPv4 and IPv6)
+
+2. Features supported
+=====================
+
+i)   Single function mode (up to 17 queues)
+
+ii)  Multi function mode (up to 17 functions)
+
+iii) PCI-SIG's I/O Virtualization
+
+       - Single Root mode: v1.0 (up to 17 functions)
+       - Multi-Root mode: v1.0 (up to 17 functions)
+
+iv)  Jumbo frames
+
+       X3100 Series supports MTU up to 9600 bytes, modifiable using
+       ip command.
+
+v)   Offloads supported: (Enabled by default)
+
+       - Checksum offload (TCP/UDP/IP) on transmit and receive paths
+       - TCP Segmentation Offload (TSO) on transmit path
+       - Generic Receive Offload (GRO) on receive path
+
+vi)  MSI-X: (Enabled by default)
+
+       Resulting in noticeable performance improvement (up to 7% on certain
+       platforms).
+
+vii) NAPI: (Enabled by default)
+
+       For better Rx interrupt moderation.
+
+viii)RTH (Receive Traffic Hash): (Enabled by default)
+
+       Receive side steering for better scaling.
+
+ix)  Statistics
+
+       Comprehensive MAC-level and software statistics displayed using
+       "ethtool -S" option.
+
+x)   Multiple hardware queues: (Enabled by default)
+
+       Up to 17 hardware based transmit and receive data channels, with
+       multiple steering options (transmit multiqueue enabled by default).
+
+3) Configurable driver parameters:
+----------------------------------
+
+i)  max_config_dev
+       Specifies maximum device functions to be enabled.
+
+       Valid range: 1-8
+
+ii) max_config_port
+       Specifies number of ports to be enabled.
+
+       Valid range: 1,2
+
+       Default: 1
+
+iii) max_config_vpath
+       Specifies maximum VPATH(s) configured for each device function.
+
+       Valid range: 1-17
+
+iv) vlan_tag_strip
+       Enables/disables vlan tag stripping from all received tagged frames that
+       are not replicated at the internal L2 switch.
+
+       Valid range: 0,1 (disabled, enabled respectively)
+
+       Default: 1
+
+v)  addr_learn_en
+       Enable learning the mac address of the guest OS interface in
+       virtualization environment.
+
+       Valid range: 0,1 (disabled, enabled respectively)
+
+       Default: 0