docs: networking: device drivers: convert sb1000.txt to ReST

- add SPDX header;
- add a document title;
- adjust titles and chapters, adding proper markups;
- mark code blocks and literals as such;
- mark lists as such;
- adjust identation, whitespaces and blank lines where needed;
- add to networking/index.rst.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 224 insertions, 208 deletions

diff --git a/Documentation/networking/device_drivers/index.rst b/Documentation/networking/device_drivers/index.rst
index 66ed884548cc..77270d59943b 100644
--- a/Documentation/networking/device_drivers/index.rst
+++ b/Documentation/networking/device_drivers/index.rst
@@ -45,6 +45,7 @@ Contents:
    neterion/s2io
    neterion/vxge
    qualcomm/rmnet
+   sb1000
 
 .. only::  subproject and html
 
diff --git a/Documentation/networking/device_drivers/sb1000.rst b/Documentation/networking/device_drivers/sb1000.rst
new file mode 100644
index 000000000000..c8582ca4034d
--- /dev/null
+++ b/Documentation/networking/device_drivers/sb1000.rst
@@ -0,0 +1,222 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+===================
+SB100 device driver
+===================
+
+sb1000 is a module network device driver for the General Instrument (also known
+as NextLevel) SURFboard1000 internal cable modem board.  This is an ISA card
+which is used by a number of cable TV companies to provide cable modem access.
+It's a one-way downstream-only cable modem, meaning that your upstream net link
+is provided by your regular phone modem.
+
+This driver was written by Franco Venturi <fventuri@mediaone.net>.  He deserves
+a great deal of thanks for this wonderful piece of code!
+
+Needed tools
+============
+
+Support for this device is now a part of the standard Linux kernel.  The
+driver source code file is drivers/net/sb1000.c.  In addition to this
+you will need:
+
+1. The "cmconfig" program.  This is a utility which supplements "ifconfig"
+   to configure the cable modem and network interface (usually called "cm0");
+
+2. Several PPP scripts which live in /etc/ppp to make connecting via your
+   cable modem easy.
+
+   These utilities can be obtained from:
+
+      http://www.jacksonville.net/~fventuri/
+
+   in Franco's original source code distribution .tar.gz file.  Support for
+   the sb1000 driver can be found at:
+
+      - http://web.archive.org/web/%2E/http://home.adelphia.net/~siglercm/sb1000.html
+      - http://web.archive.org/web/%2E/http://linuxpower.cx/~cable/
+
+   along with these utilities.
+
+3. The standard isapnp tools.  These are necessary to configure your SB1000
+   card at boot time (or afterwards by hand) since it's a PnP card.
+
+   If you don't have these installed as a standard part of your Linux
+   distribution, you can find them at:
+
+      http://www.roestock.demon.co.uk/isapnptools/
+
+   or check your Linux distribution binary CD or their web site.  For help with
+   isapnp, pnpdump, or /etc/isapnp.conf, go to:
+
+      http://www.roestock.demon.co.uk/isapnptools/isapnpfaq.html
+
+Using the driver
+================
+
+To make the SB1000 card work, follow these steps:
+
+1. Run ``make config``, or ``make menuconfig``, or ``make xconfig``, whichever
+   you prefer, in the top kernel tree directory to set up your kernel
+   configuration.  Make sure to say "Y" to "Prompt for development drivers"
+   and to say "M" to the sb1000 driver.  Also say "Y" or "M" to all the standard
+   networking questions to get TCP/IP and PPP networking support.
+
+2. **BEFORE** you build the kernel, edit drivers/net/sb1000.c.  Make sure
+   to redefine the value of READ_DATA_PORT to match the I/O address used
+   by isapnp to access your PnP cards.  This is the value of READPORT in
+   /etc/isapnp.conf or given by the output of pnpdump.
+
+3. Build and install the kernel and modules as usual.
+
+4. Boot your new kernel following the usual procedures.
+
+5. Set up to configure the new SB1000 PnP card by capturing the output
+   of "pnpdump" to a file and editing this file to set the correct I/O ports,
+   IRQ, and DMA settings for all your PnP cards.  Make sure none of the settings
+   conflict with one another.  Then test this configuration by running the
+   "isapnp" command with your new config file as the input.  Check for
+   errors and fix as necessary.  (As an aside, I use I/O ports 0x110 and
+   0x310 and IRQ 11 for my SB1000 card and these work well for me.  YMMV.)
+   Then save the finished config file as /etc/isapnp.conf for proper
+   configuration on subsequent reboots.
+
+6. Download the original file sb1000-1.1.2.tar.gz from Franco's site or one of
+   the others referenced above.  As root, unpack it into a temporary directory
+   and do a ``make cmconfig`` and then ``install -c cmconfig /usr/local/sbin``.
+   Don't do ``make install`` because it expects to find all the utilities built
+   and ready for installation, not just cmconfig.
+
+7. As root, copy all the files under the ppp/ subdirectory in Franco's
+   tar file into /etc/ppp, being careful not to overwrite any files that are
+   already in there.  Then modify ppp@gi-on to set the correct login name,
+   phone number, and frequency for the cable modem.  Also edit pap-secrets
+   to specify your login name and password and any site-specific information
+   you need.
+
+8. Be sure to modify /etc/ppp/firewall to use ipchains instead of
+   the older ipfwadm commands from the 2.0.x kernels.  There's a neat utility to
+   convert ipfwadm commands to ipchains commands:
+
+	http://users.dhp.com/~whisper/ipfwadm2ipchains/
+
+   You may also wish to modify the firewall script to implement a different
+   firewalling scheme.
+
+9. Start the PPP connection via the script /etc/ppp/ppp@gi-on.  You must be
+   root to do this.  It's better to use a utility like sudo to execute
+   frequently used commands like this with root permissions if possible.  If you
+   connect successfully the cable modem interface will come up and you'll see a
+   driver message like this at the console::
+
+	 cm0: sb1000 at (0x110,0x310), csn 1, S/N 0x2a0d16d8, IRQ 11.
+	 sb1000.c:v1.1.2 6/01/98 (fventuri@mediaone.net)
+
+   The "ifconfig" command should show two new interfaces, ppp0 and cm0.
+
+   The command "cmconfig cm0" will give you information about the cable modem
+   interface.
+
+10. Try pinging a site via ``ping -c 5 www.yahoo.com``, for example.  You should
+    see packets received.
+
+11. If you can't get site names (like www.yahoo.com) to resolve into
+    IP addresses (like 204.71.200.67), be sure your /etc/resolv.conf file
+    has no syntax errors and has the right nameserver IP addresses in it.
+    If this doesn't help, try something like ``ping -c 5 204.71.200.67`` to
+    see if the networking is running but the DNS resolution is where the
+    problem lies.
+
+12. If you still have problems, go to the support web sites mentioned above
+    and read the information and documentation there.
+
+Common problems
+===============
+
+1. Packets go out on the ppp0 interface but don't come back on the cm0
+   interface.  It looks like I'm connected but I can't even ping any
+   numerical IP addresses.  (This happens predominantly on Debian systems due
+   to a default boot-time configuration script.)
+
+Solution
+   As root ``echo 0 > /proc/sys/net/ipv4/conf/cm0/rp_filter`` so it
+   can share the same IP address as the ppp0 interface.  Note that this
+   command should probably be added to the /etc/ppp/cablemodem script
+   *right*between* the "/sbin/ifconfig" and "/sbin/cmconfig" commands.
+   You may need to do this to /proc/sys/net/ipv4/conf/ppp0/rp_filter as well.
+   If you do this to /proc/sys/net/ipv4/conf/default/rp_filter on each reboot
+   (in rc.local or some such) then any interfaces can share the same IP
+   addresses.
+
+2. I get "unresolved symbol" error messages on executing ``insmod sb1000.o``.
+
+Solution
+   You probably have a non-matching kernel source tree and
+   /usr/include/linux and /usr/include/asm header files.  Make sure you
+   install the correct versions of the header files in these two directories.
+   Then rebuild and reinstall the kernel.
+
+3. When isapnp runs it reports an error, and my SB1000 card isn't working.
+
+Solution
+   There's a problem with later versions of isapnp using the "(CHECK)"
+   option in the lines that allocate the two I/O addresses for the SB1000 card.
+   This first popped up on RH 6.0.  Delete "(CHECK)" for the SB1000 I/O addresses.
+   Make sure they don't conflict with any other pieces of hardware first!  Then
+   rerun isapnp and go from there.
+
+4. I can't execute the /etc/ppp/ppp@gi-on file.
+
+Solution
+   As root do ``chmod ug+x /etc/ppp/ppp@gi-on``.
+
+5. The firewall script isn't working (with 2.2.x and higher kernels).
+
+Solution
+   Use the ipfwadm2ipchains script referenced above to convert the
+   /etc/ppp/firewall script from the deprecated ipfwadm commands to ipchains.
+
+6. I'm getting *tons* of firewall deny messages in the /var/kern.log,
+   /var/messages, and/or /var/syslog files, and they're filling up my /var
+   partition!!!
+
+Solution
+   First, tell your ISP that you're receiving DoS (Denial of Service)
+   and/or portscanning (UDP connection attempts) attacks!  Look over the deny
+   messages to figure out what the attack is and where it's coming from.  Next,
+   edit /etc/ppp/cablemodem and make sure the ",nobroadcast" option is turned on
+   to the "cmconfig" command (uncomment that line).  If you're not receiving these
+   denied packets on your broadcast interface (IP address xxx.yyy.zzz.255
+   typically), then someone is attacking your machine in particular.  Be careful
+   out there....
+
+7. Everything seems to work fine but my computer locks up after a while
+   (and typically during a lengthy download through the cable modem)!
+
+Solution
+   You may need to add a short delay in the driver to 'slow down' the
+   SURFboard because your PC might not be able to keep up with the transfer rate
+   of the SB1000. To do this, it's probably best to download Franco's
+   sb1000-1.1.2.tar.gz archive and build and install sb1000.o manually.  You'll
+   want to edit the 'Makefile' and look for the 'SB1000_DELAY'
+   define.  Uncomment those 'CFLAGS' lines (and comment out the default ones)
+   and try setting the delay to something like 60 microseconds with:
+   '-DSB1000_DELAY=60'.  Then do ``make`` and as root ``make install`` and try
+   it out.  If it still doesn't work or you like playing with the driver, you may
+   try other numbers.  Remember though that the higher the delay, the slower the
+   driver (which slows down the rest of the PC too when it is actively
+   used). Thanks to Ed Daiga for this tip!
+
+Credits
+=======
+
+This README came from Franco Venturi's original README file which is
+still supplied with his driver .tar.gz archive.  I and all other sb1000 users
+owe Franco a tremendous "Thank you!"  Additional thanks goes to Carl Patten
+and Ralph Bonnell who are now managing the Linux SB1000 web site, and to
+the SB1000 users who reported and helped debug the common problems listed
+above.
+
+
+					Clemmitt Sigler
+					csigler@vt.edu
diff --git a/Documentation/networking/device_drivers/sb1000.txt b/Documentation/networking/device_drivers/sb1000.txt
deleted file mode 100644
index f92c2aac56a9..000000000000
--- a/Documentation/networking/device_drivers/sb1000.txt
+++ /dev/null
@@ -1,207 +0,0 @@
-sb1000 is a module network device driver for the General Instrument (also known
-as NextLevel) SURFboard1000 internal cable modem board.  This is an ISA card
-which is used by a number of cable TV companies to provide cable modem access.
-It's a one-way downstream-only cable modem, meaning that your upstream net link
-is provided by your regular phone modem.
-
-This driver was written by Franco Venturi <fventuri@mediaone.net>.  He deserves
-a great deal of thanks for this wonderful piece of code!
-
------------------------------------------------------------------------------
-
-Support for this device is now a part of the standard Linux kernel.  The
-driver source code file is drivers/net/sb1000.c.  In addition to this
-you will need:
-
-1.) The "cmconfig" program.  This is a utility which supplements "ifconfig"
-to configure the cable modem and network interface (usually called "cm0");
-and
-
-2.) Several PPP scripts which live in /etc/ppp to make connecting via your
-cable modem easy.
-
-   These utilities can be obtained from:
-
-      http://www.jacksonville.net/~fventuri/
-
-   in Franco's original source code distribution .tar.gz file.  Support for
-   the sb1000 driver can be found at:
-
-      http://web.archive.org/web/*/http://home.adelphia.net/~siglercm/sb1000.html
-      http://web.archive.org/web/*/http://linuxpower.cx/~cable/
-
-   along with these utilities.
-
-3.) The standard isapnp tools.  These are necessary to configure your SB1000
-card at boot time (or afterwards by hand) since it's a PnP card.
-
-   If you don't have these installed as a standard part of your Linux
-   distribution, you can find them at:
-
-      http://www.roestock.demon.co.uk/isapnptools/
-
-   or check your Linux distribution binary CD or their web site.  For help with
-   isapnp, pnpdump, or /etc/isapnp.conf, go to:
-
-      http://www.roestock.demon.co.uk/isapnptools/isapnpfaq.html
-
------------------------------------------------------------------------------
-
-To make the SB1000 card work, follow these steps:
-
-1.) Run `make config', or `make menuconfig', or `make xconfig', whichever
-you prefer, in the top kernel tree directory to set up your kernel
-configuration.  Make sure to say "Y" to "Prompt for development drivers"
-and to say "M" to the sb1000 driver.  Also say "Y" or "M" to all the standard
-networking questions to get TCP/IP and PPP networking support.
-
-2.) *BEFORE* you build the kernel, edit drivers/net/sb1000.c.  Make sure
-to redefine the value of READ_DATA_PORT to match the I/O address used
-by isapnp to access your PnP cards.  This is the value of READPORT in
-/etc/isapnp.conf or given by the output of pnpdump.
-
-3.) Build and install the kernel and modules as usual.
-
-4.) Boot your new kernel following the usual procedures.
-
-5.) Set up to configure the new SB1000 PnP card by capturing the output
-of "pnpdump" to a file and editing this file to set the correct I/O ports,
-IRQ, and DMA settings for all your PnP cards.  Make sure none of the settings
-conflict with one another.  Then test this configuration by running the
-"isapnp" command with your new config file as the input.  Check for
-errors and fix as necessary.  (As an aside, I use I/O ports 0x110 and
-0x310 and IRQ 11 for my SB1000 card and these work well for me.  YMMV.)
-Then save the finished config file as /etc/isapnp.conf for proper configuration
-on subsequent reboots.
-
-6.) Download the original file sb1000-1.1.2.tar.gz from Franco's site or one of
-the others referenced above.  As root, unpack it into a temporary directory and
-do a `make cmconfig' and then `install -c cmconfig /usr/local/sbin'.  Don't do
-`make install' because it expects to find all the utilities built and ready for
-installation, not just cmconfig.
-
-7.) As root, copy all the files under the ppp/ subdirectory in Franco's
-tar file into /etc/ppp, being careful not to overwrite any files that are
-already in there.  Then modify ppp@gi-on to set the correct login name,
-phone number, and frequency for the cable modem.  Also edit pap-secrets
-to specify your login name and password and any site-specific information
-you need.
-
-8.) Be sure to modify /etc/ppp/firewall to use ipchains instead of
-the older ipfwadm commands from the 2.0.x kernels.  There's a neat utility to
-convert ipfwadm commands to ipchains commands:
-
-   http://users.dhp.com/~whisper/ipfwadm2ipchains/
-
-You may also wish to modify the firewall script to implement a different
-firewalling scheme.
-
-9.) Start the PPP connection via the script /etc/ppp/ppp@gi-on.  You must be
-root to do this.  It's better to use a utility like sudo to execute
-frequently used commands like this with root permissions if possible.  If you
-connect successfully the cable modem interface will come up and you'll see a
-driver message like this at the console:
-
-         cm0: sb1000 at (0x110,0x310), csn 1, S/N 0x2a0d16d8, IRQ 11.
-         sb1000.c:v1.1.2 6/01/98 (fventuri@mediaone.net)
-
-The "ifconfig" command should show two new interfaces, ppp0 and cm0.
-The command "cmconfig cm0" will give you information about the cable modem
-interface.
-
-10.) Try pinging a site via `ping -c 5 www.yahoo.com', for example.  You should
-see packets received.
-
-11.) If you can't get site names (like www.yahoo.com) to resolve into
-IP addresses (like 204.71.200.67), be sure your /etc/resolv.conf file
-has no syntax errors and has the right nameserver IP addresses in it.
-If this doesn't help, try something like `ping -c 5 204.71.200.67' to
-see if the networking is running but the DNS resolution is where the
-problem lies.
-
-12.) If you still have problems, go to the support web sites mentioned above
-and read the information and documentation there.
-
------------------------------------------------------------------------------
-
-Common problems:
-
-1.) Packets go out on the ppp0 interface but don't come back on the cm0
-interface.  It looks like I'm connected but I can't even ping any
-numerical IP addresses.  (This happens predominantly on Debian systems due
-to a default boot-time configuration script.)
-
-Solution -- As root `echo 0 > /proc/sys/net/ipv4/conf/cm0/rp_filter' so it
-can share the same IP address as the ppp0 interface.  Note that this
-command should probably be added to the /etc/ppp/cablemodem script
-*right*between* the "/sbin/ifconfig" and "/sbin/cmconfig" commands.
-You may need to do this to /proc/sys/net/ipv4/conf/ppp0/rp_filter as well.
-If you do this to /proc/sys/net/ipv4/conf/default/rp_filter on each reboot
-(in rc.local or some such) then any interfaces can share the same IP
-addresses.
-
-2.) I get "unresolved symbol" error messages on executing `insmod sb1000.o'.
-
-Solution -- You probably have a non-matching kernel source tree and
-/usr/include/linux and /usr/include/asm header files.  Make sure you
-install the correct versions of the header files in these two directories.
-Then rebuild and reinstall the kernel.
-
-3.) When isapnp runs it reports an error, and my SB1000 card isn't working.
-
-Solution -- There's a problem with later versions of isapnp using the "(CHECK)"
-option in the lines that allocate the two I/O addresses for the SB1000 card.
-This first popped up on RH 6.0.  Delete "(CHECK)" for the SB1000 I/O addresses.
-Make sure they don't conflict with any other pieces of hardware first!  Then
-rerun isapnp and go from there.
-
-4.) I can't execute the /etc/ppp/ppp@gi-on file.
-
-Solution -- As root do `chmod ug+x /etc/ppp/ppp@gi-on'.
-
-5.) The firewall script isn't working (with 2.2.x and higher kernels).
-
-Solution -- Use the ipfwadm2ipchains script referenced above to convert the
-/etc/ppp/firewall script from the deprecated ipfwadm commands to ipchains.
-
-6.) I'm getting *tons* of firewall deny messages in the /var/kern.log,
-/var/messages, and/or /var/syslog files, and they're filling up my /var
-partition!!!
-
-Solution -- First, tell your ISP that you're receiving DoS (Denial of Service)
-and/or portscanning (UDP connection attempts) attacks!  Look over the deny
-messages to figure out what the attack is and where it's coming from.  Next,
-edit /etc/ppp/cablemodem and make sure the ",nobroadcast" option is turned on
-to the "cmconfig" command (uncomment that line).  If you're not receiving these
-denied packets on your broadcast interface (IP address xxx.yyy.zzz.255
-typically), then someone is attacking your machine in particular.  Be careful
-out there....
-
-7.) Everything seems to work fine but my computer locks up after a while
-(and typically during a lengthy download through the cable modem)!
-
-Solution -- You may need to add a short delay in the driver to 'slow down' the
-SURFboard because your PC might not be able to keep up with the transfer rate
-of the SB1000. To do this, it's probably best to download Franco's
-sb1000-1.1.2.tar.gz archive and build and install sb1000.o manually.  You'll
-want to edit the 'Makefile' and look for the 'SB1000_DELAY'
-define.  Uncomment those 'CFLAGS' lines (and comment out the default ones)
-and try setting the delay to something like 60 microseconds with:
-'-DSB1000_DELAY=60'.  Then do `make' and as root `make install' and try
-it out.  If it still doesn't work or you like playing with the driver, you may
-try other numbers.  Remember though that the higher the delay, the slower the
-driver (which slows down the rest of the PC too when it is actively
-used). Thanks to Ed Daiga for this tip!
-
------------------------------------------------------------------------------
-
-Credits:  This README came from Franco Venturi's original README file which is
-still supplied with his driver .tar.gz archive.  I and all other sb1000 users
-owe Franco a tremendous "Thank you!"  Additional thanks goes to Carl Patten
-and Ralph Bonnell who are now managing the Linux SB1000 web site, and to
-the SB1000 users who reported and helped debug the common problems listed
-above.
-
-
-					Clemmitt Sigler
-					csigler@vt.edu
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index 3f2c98a7906c..c7d310ef1c83 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -460,7 +460,7 @@ config NET_SB1000
 
 	  At present this driver only compiles as a module, so say M here if
 	  you have this card. The module will be called sb1000. Then read
-	  <file:Documentation/networking/device_drivers/sb1000.txt> for
+	  <file:Documentation/networking/device_drivers/sb1000.rst> for
 	  information on how to use this module, as it needs special ppp
 	  scripts for establishing a connection. Further documentation
 	  and the necessary scripts can be found at: