net: ethernet: neterion: s2io: remove unused driver

The s2io driver supports Exar (formerly Neterion and S2io) PCI-X 10
Gigabit Ethernet cards. Hardware supporting PCI-X has not been
manufactured in years. On x86, it was quickly replaced by PCIe. While
it stuck around longer on POWER hardware, the last POWER hardware to
support it was POWER7, which is not supported by ppc64le Linux
distributions. The last supported mainstream ppc64 Linux distribution
was RHEL 7; while it is still supported under ELS, ELS is only
available for x86 and IBM Z. It is possible to use many PCI-X cards in
standard PCI slots (which are still available on new motherboards), but
it does not make sense to do so for 10 Gigabit Ethernet because the
maximum bandwidth of standard PCI is only 1067 Mbps. It is therefore
highly unlikely that this driver is still being used. Remove the
driver, and move the former maintainer to the CREDITS file (restoring
credit for the vxge driver, which was removed in commit f05643a0f60b
("eth: remove neterion/vxge").

Signed-off-by: Ethan Nelson-Moore <enelsonmoore@gmail.com>
Link: https://patch.msgid.link/20260126031352.22997-1-enelsonmoore@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

4 files changed, 0 insertions, 199 deletions

diff --git a/Documentation/.renames.txt b/Documentation/.renames.txt
index c0bd5d3dc8b9..a37d68471d50 100644
--- a/Documentation/.renames.txt
+++ b/Documentation/.renames.txt
@@ -819,7 +819,6 @@ networking/device_drivers/intel/ixgbe networking/device_drivers/ethernet/intel/i
 networking/device_drivers/intel/ixgbevf networking/device_drivers/ethernet/intel/ixgbevf
 networking/device_drivers/marvell/octeontx2 networking/device_drivers/ethernet/marvell/octeontx2
 networking/device_drivers/microsoft/netvsc networking/device_drivers/ethernet/microsoft/netvsc
-networking/device_drivers/neterion/s2io networking/device_drivers/ethernet/neterion/s2io
 networking/device_drivers/netronome/nfp networking/device_drivers/ethernet/netronome/nfp
 networking/device_drivers/pensando/ionic networking/device_drivers/ethernet/pensando/ionic
 networking/device_drivers/qualcomm/rmnet networking/device_drivers/cellular/qualcomm/rmnet
diff --git a/Documentation/PCI/pci-error-recovery.rst b/Documentation/PCI/pci-error-recovery.rst
index 43bc4e3665b4..43838723fde9 100644
--- a/Documentation/PCI/pci-error-recovery.rst
+++ b/Documentation/PCI/pci-error-recovery.rst
@@ -460,7 +460,6 @@ That is, the recovery API only requires that:
    - drivers/net/e1000e
    - drivers/net/ixgbe
    - drivers/net/cxgb3
-   - drivers/net/s2io.c
 
    The cor_error_detected() callback is invoked in handle_error_source() when
    the error severity is "correctable". The callback is optional and allows
diff --git a/Documentation/networking/device_drivers/ethernet/index.rst b/Documentation/networking/device_drivers/ethernet/index.rst
index bcc02355f828..5e8fc3d6d741 100644
--- a/Documentation/networking/device_drivers/ethernet/index.rst
+++ b/Documentation/networking/device_drivers/ethernet/index.rst
@@ -48,7 +48,6 @@ Contents:
    meta/fbnic
    microsoft/netvsc
    mucse/rnpgbe
-   neterion/s2io
    netronome/nfp
    pensando/ionic
    pensando/ionic_rdma
diff --git a/Documentation/networking/device_drivers/ethernet/neterion/s2io.rst b/Documentation/networking/device_drivers/ethernet/neterion/s2io.rst
deleted file mode 100644
index d731b5a98561..000000000000
--- a/Documentation/networking/device_drivers/ethernet/neterion/s2io.rst
+++ /dev/null
@@ -1,196 +0,0 @@
-.. 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
-   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.)