Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted

Pull networking updates from Jakub Kicinski:
 "Core:

   - Add dedicated kmem_cache for typical/small skb->head, avoid having
     to access struct page at kfree time, and improve memory use.

   - Introduce sysctl to set default RPS configuration for new netdevs.

   - Define Netlink protocol specification format which can be used to
     describe messages used by each family and auto-generate parsers.
     Add tools for generating kernel data structures and uAPI headers.

   - Expose all net/core sysctls inside netns.

   - Remove 4s sleep in netpoll if carrier is instantly detected on
     boot.

   - Add configurable limit of MDB entries per port, and port-vlan.

   - Continue populating drop reasons throughout the stack.

   - Retire a handful of legacy Qdiscs and classifiers.

  Protocols:

   - Support IPv4 big TCP (TSO frames larger than 64kB).

   - Add IP_LOCAL_PORT_RANGE socket option, to control local port range
     on socket by socket basis.

   - Track and report in procfs number of MPTCP sockets used.

   - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path
     manager.

   - IPv6: don't check net.ipv6.route.max_size and rely on garbage
     collection to free memory (similarly to IPv4).

   - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986).

   - ICMP: add per-rate limit counters.

   - Add support for user scanning requests in ieee802154.

   - Remove static WEP support.

   - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate
     reporting.

   - WiFi 7 EHT channel puncturing support (client & AP).

  BPF:

   - Add a rbtree data structure following the "next-gen data structure"
     precedent set by recently added linked list, that is, by using
     kfunc + kptr instead of adding a new BPF map type.

   - Expose XDP hints via kfuncs with initial support for RX hash and
     timestamp metadata.

   - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to
     better support decap on GRE tunnel devices not operating in collect
     metadata.

   - Improve x86 JIT's codegen for PROBE_MEM runtime error checks.

   - Remove the need for trace_printk_lock for bpf_trace_printk and
     bpf_trace_vprintk helpers.

   - Extend libbpf's bpf_tracing.h support for tracing arguments of
     kprobes/uprobes and syscall as a special case.

   - Significantly reduce the search time for module symbols by
     livepatch and BPF.

   - Enable cpumasks to be used as kptrs, which is useful for tracing
     programs tracking which tasks end up running on which CPUs in
     different time intervals.

   - Add support for BPF trampoline on s390x and riscv64.

   - Add capability to export the XDP features supported by the NIC.

   - Add __bpf_kfunc tag for marking kernel functions as kfuncs.

   - Add cgroup.memory=nobpf kernel parameter option to disable BPF
     memory accounting for container environments.

  Netfilter:

   - Remove the CLUSTERIP target. It has been marked as obsolete for
     years, and we still have WARN splats wrt races of the out-of-band
     /proc interface installed by this target.

   - Add 'destroy' commands to nf_tables. They are identical to the
     existing 'delete' commands, but do not return an error if the
     referenced object (set, chain, rule...) did not exist.

  Driver API:

   - Improve cpumask_local_spread() locality to help NICs set the right
     IRQ affinity on AMD platforms.

   - Separate C22 and C45 MDIO bus transactions more clearly.

   - Introduce new DCB table to control DSCP rewrite on egress.

   - Support configuration of Physical Layer Collision Avoidance (PLCA)
     Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of
     shared medium Ethernet.

   - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing
     preemption of low priority frames by high priority frames.

   - Add support for controlling MACSec offload using netlink SET.

   - Rework devlink instance refcounts to allow registration and
     de-registration under the instance lock. Split the code into
     multiple files, drop some of the unnecessarily granular locks and
     factor out common parts of netlink operation handling.

   - Add TX frame aggregation parameters (for USB drivers).

   - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning
     messages with notifications for debug.

   - Allow offloading of UDP NEW connections via act_ct.

   - Add support for per action HW stats in TC.

   - Support hardware miss to TC action (continue processing in SW from
     a specific point in the action chain).

   - Warn if old Wireless Extension user space interface is used with
     modern cfg80211/mac80211 drivers. Do not support Wireless
     Extensions for Wi-Fi 7 devices at all. Everyone should switch to
     using nl80211 interface instead.

   - Improve the CAN bit timing configuration. Use extack to return
     error messages directly to user space, update the SJW handling,
     including the definition of a new default value that will benefit
     CAN-FD controllers, by increasing their oscillator tolerance.

  New hardware / drivers:

   - Ethernet:
      - nVidia BlueField-3 support (control traffic driver)
      - Ethernet support for imx93 SoCs
      - Motorcomm yt8531 gigabit Ethernet PHY
      - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA)
      - Microchip LAN8841 PHY (incl. cable diagnostics and PTP)
      - Amlogic gxl MDIO mux

   - WiFi:
      - RealTek RTL8188EU (rtl8xxxu)
      - Qualcomm Wi-Fi 7 devices (ath12k)

   - CAN:
      - Renesas R-Car V4H

  Drivers:

   - Bluetooth:
      - Set Per Platform Antenna Gain (PPAG) for Intel controllers.

   - Ethernet NICs:
      - Intel (1G, igc):
         - support TSN / Qbv / packet scheduling features of i226 model
      - Intel (100G, ice):
         - use GNSS subsystem instead of TTY
         - multi-buffer XDP support
         - extend support for GPIO pins to E823 devices
      - nVidia/Mellanox:
         - update the shared buffer configuration on PFC commands
         - implement PTP adjphase function for HW offset control
         - TC support for Geneve and GRE with VF tunnel offload
         - more efficient crypto key management method
         - multi-port eswitch support
      - Netronome/Corigine:
         - add DCB IEEE support
         - support IPsec offloading for NFP3800
      - Freescale/NXP (enetc):
         - support XDP_REDIRECT for XDP non-linear buffers
         - improve reconfig, avoid link flap and waiting for idle
         - support MAC Merge layer
      - Other NICs:
         - sfc/ef100: add basic devlink support for ef100
         - ionic: rx_push mode operation (writing descriptors via MMIO)
         - bnxt: use the auxiliary bus abstraction for RDMA
         - r8169: disable ASPM and reset bus in case of tx timeout
         - cpsw: support QSGMII mode for J721e CPSW9G
         - cpts: support pulse-per-second output
         - ngbe: add an mdio bus driver
         - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing
         - r8152: handle devices with FW with NCM support
         - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation
         - virtio-net: support multi buffer XDP
         - virtio/vsock: replace virtio_vsock_pkt with sk_buff
         - tsnep: XDP support

   - Ethernet high-speed switches:
      - nVidia/Mellanox (mlxsw):
         - add support for latency TLV (in FW control messages)
      - Microchip (sparx5):
         - separate explicit and implicit traffic forwarding rules, make
           the implicit rules always active
         - add support for egress DSCP rewrite
         - IS0 VCAP support (Ingress Classification)
         - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS
           etc.)
         - ES2 VCAP support (Egress Access Control)
         - support for Per-Stream Filtering and Policing (802.1Q,
           8.6.5.1)

   - Ethernet embedded switches:
      - Marvell (mv88e6xxx):
         - add MAB (port auth) offload support
         - enable PTP receive for mv88e6390
      - NXP (ocelot):
         - support MAC Merge layer
         - support for the the vsc7512 internal copper phys
      - Microchip:
         - lan9303: convert to PHYLINK
         - lan966x: support TC flower filter statistics
         - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x
         - lan937x: support Credit Based Shaper configuration
         - ksz9477: support Energy Efficient Ethernet
      - other:
         - qca8k: convert to regmap read/write API, use bulk operations
         - rswitch: Improve TX timestamp accuracy

   - Intel WiFi (iwlwifi):
      - EHT (Wi-Fi 7) rate reporting
      - STEP equalizer support: transfer some STEP (connection to radio
        on platforms with integrated wifi) related parameters from the
        BIOS to the firmware.

   - Qualcomm 802.11ax WiFi (ath11k):
      - IPQ5018 support
      - Fine Timing Measurement (FTM) responder role support
      - channel 177 support

   - MediaTek WiFi (mt76):
      - per-PHY LED support
      - mt7996: EHT (Wi-Fi 7) support
      - Wireless Ethernet Dispatch (WED) reset support
      - switch to using page pool allocator

   - RealTek WiFi (rtw89):
      - support new version of Bluetooth co-existance

   - Mobile:
      - rmnet: support TX aggregation"

* tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits)
  page_pool: add a comment explaining the fragment counter usage
  net: ethtool: fix __ethtool_dev_mm_supported() implementation
  ethtool: pse-pd: Fix double word in comments
  xsk: add linux/vmalloc.h to xsk.c
  sefltests: netdevsim: wait for devlink instance after netns removal
  selftest: fib_tests: Always cleanup before exit
  net/mlx5e: Align IPsec ASO result memory to be as required by hardware
  net/mlx5e: TC, Set CT miss to the specific ct action instance
  net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG
  net/mlx5: Refactor tc miss handling to a single function
  net/mlx5: Kconfig: Make tc offload depend on tc skb extension
  net/sched: flower: Support hardware miss to tc action
  net/sched: flower: Move filter handle initialization earlier
  net/sched: cls_api: Support hardware miss to tc action
  net/sched: Rename user cookie and act cookie
  sfc: fix builds without CONFIG_RTC_LIB
  sfc: clean up some inconsistent indentings
  net/mlx4_en: Introduce flexible array to silence overflow warning
  net: lan966x: Fix possible deadlock inside PTP
  net/ulp: Remove redundant ->clone() test in inet_clone_ulp().
  ...

1 files changed, 641 insertions, 0 deletions

diff --git a/scripts/get_feat.pl b/scripts/get_feat.pl
new file mode 100755
index 000000000..5c5397eeb
--- /dev/null
+++ b/scripts/get_feat.pl
@@ -0,0 +1,641 @@
+#!/usr/bin/env perl
+# SPDX-License-Identifier: GPL-2.0
+
+use strict;
+use Pod::Usage;
+use Getopt::Long;
+use File::Find;
+use Fcntl ':mode';
+use Cwd 'abs_path';
+
+my $help;
+my $man;
+my $debug;
+my $arch;
+my $feat;
+my $enable_fname;
+
+my $basename = abs_path($0);
+$basename =~ s,/[^/]+$,/,;
+
+my $prefix=$basename . "../Documentation/features";
+
+# Used only at for full features output. The script will auto-adjust
+# such values for the minimal possible values
+my $status_size = 1;
+my $description_size = 1;
+
+GetOptions(
+	"debug|d+" => \$debug,
+	"dir=s" => \$prefix,
+	'help|?' => \$help,
+	'arch=s' => \$arch,
+	'feat=s' => \$feat,
+	'feature=s' => \$feat,
+	"enable-fname" => \$enable_fname,
+	man => \$man
+) or pod2usage(2);
+
+pod2usage(1) if $help;
+pod2usage(-exitstatus => 0, -verbose => 2) if $man;
+
+pod2usage(1) if (scalar @ARGV < 1 || @ARGV > 2);
+
+my ($cmd, $arg) = @ARGV;
+
+pod2usage(2) if ($cmd ne "current" && $cmd ne "rest" && $cmd ne "validate"
+		&& $cmd ne "ls" && $cmd ne "list");
+
+require Data::Dumper if ($debug);
+
+my %data;
+my %archs;
+
+#
+# Displays an error message, printing file name and line
+#
+sub parse_error($$$$) {
+	my ($file, $ln, $msg, $data) = @_;
+
+	$data =~ s/\s+$/\n/;
+
+	print STDERR "Warning: file $file#$ln:\n\t$msg";
+
+	if ($data ne "") {
+		print STDERR ". Line\n\t\t$data";
+	} else {
+	    print STDERR "\n";
+	}
+}
+
+#
+# Parse a features file, storing its contents at %data
+#
+
+my $h_name = "Feature";
+my $h_kconfig = "Kconfig";
+my $h_description = "Description";
+my $h_subsys = "Subsystem";
+my $h_status = "Status";
+my $h_arch = "Architecture";
+
+my $max_size_name = length($h_name);
+my $max_size_kconfig = length($h_kconfig);
+my $max_size_description = length($h_description);
+my $max_size_subsys = length($h_subsys);
+my $max_size_status = length($h_status);
+
+my $max_size_arch = 0;
+my $max_size_arch_with_header;
+my $max_description_word = 0;
+
+sub parse_feat {
+	my $file = $File::Find::name;
+
+	my $mode = (stat($file))[2];
+	return if ($mode & S_IFDIR);
+	return if ($file =~ m,($prefix)/arch-support.txt,);
+	return if (!($file =~ m,arch-support.txt$,));
+
+	if ($enable_fname) {
+		printf ".. FILE %s\n", abs_path($file);
+	}
+
+	my $subsys = "";
+	$subsys = $2 if ( m,.*($prefix)/([^/]+).*,);
+
+	if (length($subsys) > $max_size_subsys) {
+		$max_size_subsys = length($subsys);
+	}
+
+	my $name;
+	my $kconfig;
+	my $description;
+	my $comments = "";
+	my $last_status;
+	my $ln;
+	my %arch_table;
+
+	print STDERR "Opening $file\n" if ($debug > 1);
+	open IN, $file;
+
+	while(<IN>) {
+		$ln++;
+
+		if (m/^\#\s+Feature\s+name:\s*(.*\S)/) {
+			$name = $1;
+			if (length($name) > $max_size_name) {
+				$max_size_name = length($name);
+			}
+			next;
+		}
+		if (m/^\#\s+Kconfig:\s*(.*\S)/) {
+			$kconfig = $1;
+			if (length($kconfig) > $max_size_kconfig) {
+				$max_size_kconfig = length($kconfig);
+			}
+			next;
+		}
+		if (m/^\#\s+description:\s*(.*\S)/) {
+			$description = $1;
+			if (length($description) > $max_size_description) {
+				$max_size_description = length($description);
+			}
+
+			foreach my $word (split /\s+/, $description) {
+				if (length($word) > $max_description_word) {
+					$max_description_word = length($word);
+				}
+			}
+
+			next;
+		}
+		next if (m/^\\s*$/);
+		next if (m/^\s*\-+\s*$/);
+		next if (m/^\s*\|\s*arch\s*\|\s*status\s*\|\s*$/);
+
+		if (m/^\#\s*(.*)/) {
+			$comments .= "$1\n";
+			next;
+		}
+		if (m/^\s*\|\s*(\S+):\s*\|\s*(\S+)\s*\|\s*$/) {
+			my $a = $1;
+			my $status = $2;
+
+			if (length($status) > $max_size_status) {
+				$max_size_status = length($status);
+			}
+			if (length($a) > $max_size_arch) {
+				$max_size_arch = length($a);
+			}
+
+			$status = "---" if ($status =~ m/^\.\.$/);
+
+			$archs{$a} = 1;
+			$arch_table{$a} = $status;
+			next;
+		}
+
+		#Everything else is an error
+		parse_error($file, $ln, "line is invalid", $_);
+	}
+	close IN;
+
+	if (!$name) {
+		parse_error($file, $ln, "Feature name not found", "");
+		return;
+	}
+
+	parse_error($file, $ln, "Subsystem not found", "") if (!$subsys);
+	parse_error($file, $ln, "Kconfig not found", "") if (!$kconfig);
+	parse_error($file, $ln, "Description not found", "") if (!$description);
+
+	if (!%arch_table) {
+		parse_error($file, $ln, "Architecture table not found", "");
+		return;
+	}
+
+	$data{$name}->{where} = $file;
+	$data{$name}->{subsys} = $subsys;
+	$data{$name}->{kconfig} = $kconfig;
+	$data{$name}->{description} = $description;
+	$data{$name}->{comments} = $comments;
+	$data{$name}->{table} = \%arch_table;
+
+	$max_size_arch_with_header = $max_size_arch + length($h_arch);
+}
+
+#
+# Output feature(s) for a given architecture
+#
+sub output_arch_table {
+	my $title = "Feature status on $arch architecture";
+
+	print "=" x length($title) . "\n";
+	print "$title\n";
+	print "=" x length($title) . "\n\n";
+
+	print "=" x $max_size_subsys;
+	print "  ";
+	print "=" x $max_size_name;
+	print "  ";
+	print "=" x $max_size_kconfig;
+	print "  ";
+	print "=" x $max_size_status;
+	print "  ";
+	print "=" x $max_size_description;
+	print "\n";
+	printf "%-${max_size_subsys}s  ", $h_subsys;
+	printf "%-${max_size_name}s  ", $h_name;
+	printf "%-${max_size_kconfig}s  ", $h_kconfig;
+	printf "%-${max_size_status}s  ", $h_status;
+	printf "%-${max_size_description}s\n", $h_description;
+	print "=" x $max_size_subsys;
+	print "  ";
+	print "=" x $max_size_name;
+	print "  ";
+	print "=" x $max_size_kconfig;
+	print "  ";
+	print "=" x $max_size_status;
+	print "  ";
+	print "=" x $max_size_description;
+	print "\n";
+
+	foreach my $name (sort {
+				($data{$a}->{subsys} cmp $data{$b}->{subsys}) ||
+				("\L$a" cmp "\L$b")
+			       } keys %data) {
+		next if ($feat && $name ne $feat);
+
+		my %arch_table = %{$data{$name}->{table}};
+		printf "%-${max_size_subsys}s  ", $data{$name}->{subsys};
+		printf "%-${max_size_name}s  ", $name;
+		printf "%-${max_size_kconfig}s  ", $data{$name}->{kconfig};
+		printf "%-${max_size_status}s  ", $arch_table{$arch};
+		printf "%-s\n", $data{$name}->{description};
+	}
+
+	print "=" x $max_size_subsys;
+	print "  ";
+	print "=" x $max_size_name;
+	print "  ";
+	print "=" x $max_size_kconfig;
+	print "  ";
+	print "=" x $max_size_status;
+	print "  ";
+	print "=" x $max_size_description;
+	print "\n";
+}
+
+#
+# list feature(s) for a given architecture
+#
+sub list_arch_features {
+	print "#\n# Kernel feature support matrix of the '$arch' architecture:\n#\n";
+
+	foreach my $name (sort {
+				($data{$a}->{subsys} cmp $data{$b}->{subsys}) ||
+				("\L$a" cmp "\L$b")
+			       } keys %data) {
+		next if ($feat && $name ne $feat);
+
+		my %arch_table = %{$data{$name}->{table}};
+
+		my $status = $arch_table{$arch};
+		$status = " " x ((4 - length($status)) / 2) . $status;
+
+		printf " %${max_size_subsys}s/ ", $data{$name}->{subsys};
+		printf "%-${max_size_name}s: ", $name;
+		printf "%-5s|   ", $status;
+		printf "%${max_size_kconfig}s # ", $data{$name}->{kconfig};
+		printf " %s\n", $data{$name}->{description};
+	}
+}
+
+#
+# Output a feature on all architectures
+#
+sub output_feature {
+	my $title = "Feature $feat";
+
+	print "=" x length($title) . "\n";
+	print "$title\n";
+	print "=" x length($title) . "\n\n";
+
+	print ":Subsystem: $data{$feat}->{subsys} \n" if ($data{$feat}->{subsys});
+	print ":Kconfig: $data{$feat}->{kconfig} \n" if ($data{$feat}->{kconfig});
+
+	my $desc = $data{$feat}->{description};
+	$desc =~ s/^([a-z])/\U$1/;
+	$desc =~ s/\.?\s*//;
+	print "\n$desc.\n\n";
+
+	my $com = $data{$feat}->{comments};
+	$com =~ s/^\s+//;
+	$com =~ s/\s+$//;
+	if ($com) {
+		print "Comments\n";
+		print "--------\n\n";
+		print "$com\n\n";
+	}
+
+	print "=" x $max_size_arch_with_header;
+	print "  ";
+	print "=" x $max_size_status;
+	print "\n";
+
+	printf "%-${max_size_arch}s  ", $h_arch;
+	printf "%-${max_size_status}s", $h_status . "\n";
+
+	print "=" x $max_size_arch_with_header;
+	print "  ";
+	print "=" x $max_size_status;
+	print "\n";
+
+	my %arch_table = %{$data{$feat}->{table}};
+	foreach my $arch (sort keys %arch_table) {
+		printf "%-${max_size_arch}s  ", $arch;
+		printf "%-${max_size_status}s\n", $arch_table{$arch};
+	}
+
+	print "=" x $max_size_arch_with_header;
+	print "  ";
+	print "=" x $max_size_status;
+	print "\n";
+}
+
+#
+# Output all features for all architectures
+#
+
+sub matrix_lines($$$) {
+	my $desc_size = shift;
+	my $status_size = shift;
+	my $header = shift;
+	my $fill;
+	my $ln_marker;
+
+	if ($header) {
+		$ln_marker = "=";
+	} else {
+		$ln_marker = "-";
+	}
+
+	$fill = $ln_marker;
+
+	print "+";
+	print $fill x $max_size_name;
+	print "+";
+	print $fill x $desc_size;
+	print "+";
+	print $ln_marker x $status_size;
+	print "+\n";
+}
+
+sub output_matrix {
+	my $title = "Feature status on all architectures";
+	my $notcompat = "Not compatible";
+
+	print "=" x length($title) . "\n";
+	print "$title\n";
+	print "=" x length($title) . "\n\n";
+
+	my $desc_title = "$h_kconfig / $h_description";
+
+	my $desc_size = $max_size_kconfig + 4;
+	if (!$description_size) {
+		$desc_size = $max_size_description if ($max_size_description > $desc_size);
+	} else {
+		$desc_size = $description_size if ($description_size > $desc_size);
+	}
+	$desc_size = $max_description_word if ($max_description_word > $desc_size);
+
+	$desc_size = length($desc_title) if (length($desc_title) > $desc_size);
+
+	$max_size_status = length($notcompat) if (length($notcompat) > $max_size_status);
+
+	# Ensure that the status will fit
+	my $min_status_size = $max_size_status + $max_size_arch + 6;
+	$status_size = $min_status_size if ($status_size < $min_status_size);
+
+
+	my $cur_subsys = "";
+	foreach my $name (sort {
+				($data{$a}->{subsys} cmp $data{$b}->{subsys}) or
+				("\L$a" cmp "\L$b")
+			       } keys %data) {
+
+		if ($cur_subsys ne $data{$name}->{subsys}) {
+			if ($cur_subsys ne "") {
+				printf "\n";
+			}
+
+			$cur_subsys = $data{$name}->{subsys};
+
+			my $title = "Subsystem: $cur_subsys";
+			print "$title\n";
+			print "=" x length($title) . "\n\n";
+
+
+			matrix_lines($desc_size, $status_size, 0);
+
+			printf "|%-${max_size_name}s", $h_name;
+			printf "|%-${desc_size}s", $desc_title;
+
+			printf "|%-${status_size}s|\n", "Status per architecture";
+			matrix_lines($desc_size, $status_size, 1);
+		}
+
+		my %arch_table = %{$data{$name}->{table}};
+		my $cur_status = "";
+
+		my (@lines, @descs);
+		my $line = "";
+		foreach my $arch (sort {
+					($arch_table{$b} cmp $arch_table{$a}) or
+					("\L$a" cmp "\L$b")
+				       } keys %arch_table) {
+
+			my $status = $arch_table{$arch};
+
+			if ($status eq "---") {
+				$status = $notcompat;
+			}
+
+			if ($status ne $cur_status) {
+				if ($line ne "") {
+					push @lines, $line;
+					$line = "";
+				}
+				$line = "- **" . $status . "**: " . $arch;
+			} elsif (length($line) + length ($arch) + 2 < $status_size) {
+				$line .= ", " . $arch;
+			} else {
+				push @lines, $line;
+				$line = "  " . $arch;
+			}
+			$cur_status = $status;
+		}
+		push @lines, $line if ($line ne "");
+
+		my $description = $data{$name}->{description};
+		while (length($description) > $desc_size) {
+			my $d = substr $description, 0, $desc_size;
+
+			# Ensure that it will end on a space
+			# if it can't, it means that the size is too small
+			# Instead of aborting it, let's print what we have
+			if (!($d =~ s/^(.*)\s+.*/$1/)) {
+				$d = substr $d, 0, -1;
+				push @descs, "$d\\";
+				$description =~ s/^\Q$d\E//;
+			} else {
+				push @descs, $d;
+				$description =~ s/^\Q$d\E\s+//;
+			}
+		}
+		push @descs, $description;
+
+		# Ensure that the full description will be printed
+		push @lines, "" while (scalar(@lines) < 2 + scalar(@descs));
+
+		my $ln = 0;
+		for my $line(@lines) {
+			if (!$ln) {
+				printf "|%-${max_size_name}s", $name;
+				printf "|%-${desc_size}s", "``" . $data{$name}->{kconfig} . "``";
+			} elsif ($ln >= 2 && scalar(@descs)) {
+				printf "|%-${max_size_name}s", "";
+				printf "|%-${desc_size}s", shift @descs;
+			} else {
+				printf "|%-${max_size_name}s", "";
+				printf "|%-${desc_size}s", "";
+			}
+
+			printf "|%-${status_size}s|\n", $line;
+
+			$ln++;
+		}
+		matrix_lines($desc_size, $status_size, 0);
+	}
+}
+
+
+#
+# Parses all feature files located at $prefix dir
+#
+find({wanted =>\&parse_feat, no_chdir => 1}, $prefix);
+
+print STDERR Data::Dumper->Dump([\%data], [qw(*data)]) if ($debug);
+
+#
+# Handles the command
+#
+if ($cmd eq "current") {
+	$arch = qx(uname -m | sed 's/x86_64/x86/' | sed 's/i386/x86/');
+	$arch =~s/\s+$//;
+}
+
+if ($cmd eq "ls" or $cmd eq "list") {
+	if (!$arch) {
+		$arch = qx(uname -m | sed 's/x86_64/x86/' | sed 's/i386/x86/');
+		$arch =~s/\s+$//;
+	}
+
+	list_arch_features;
+
+	exit;
+}
+
+if ($cmd ne "validate") {
+	if ($arch) {
+		output_arch_table;
+	} elsif ($feat) {
+		output_feature;
+	} else {
+		output_matrix;
+	}
+}
+
+__END__
+
+=head1 NAME
+
+get_feat.pl - parse the Linux Feature files and produce a ReST book.
+
+=head1 SYNOPSIS
+
+B<get_feat.pl> [--debug] [--man] [--help] [--dir=<dir>] [--arch=<arch>]
+	       [--feature=<feature>|--feat=<feature>] <COMAND> [<ARGUMENT>]
+
+Where <COMMAND> can be:
+
+=over 8
+
+B<current>               - output table in ReST compatible ASCII format
+			   with features for this machine's architecture
+
+B<rest>                  - output table(s)  in ReST compatible ASCII format
+			   with features in ReST markup language. The output
+			   is affected by --arch or --feat/--feature flags.
+
+B<validate>              - validate the contents of the files under
+			   Documentation/features.
+
+B<ls> or B<list>         - list features for this machine's architecture,
+			   using an easier to parse format.
+			   The output is affected by --arch flag.
+
+=back
+
+=head1 OPTIONS
+
+=over 8
+
+=item B<--arch>
+
+Output features for an specific architecture, optionally filtering for
+a single specific feature.
+
+=item B<--feat> or B<--feature>
+
+Output features for a single specific feature.
+
+=item B<--dir>
+
+Changes the location of the Feature files. By default, it uses
+the Documentation/features directory.
+
+=item B<--enable-fname>
+
+Prints the file name of the feature files. This can be used in order to
+track dependencies during documentation build.
+
+=item B<--debug>
+
+Put the script in verbose mode, useful for debugging. Can be called multiple
+times, to increase verbosity.
+
+=item B<--help>
+
+Prints a brief help message and exits.
+
+=item B<--man>
+
+Prints the manual page and exits.
+
+=back
+
+=head1 DESCRIPTION
+
+Parse the Linux feature files from Documentation/features (by default),
+optionally producing results at ReST format.
+
+It supports output data per architecture, per feature or a
+feature x arch matrix.
+
+When used with B<rest> command, it will use either one of the tree formats:
+
+If neither B<--arch> or B<--feature> arguments are used, it will output a
+matrix with features per architecture.
+
+If B<--arch> argument is used, it will output the features availability for
+a given architecture.
+
+If B<--feat> argument is used, it will output the content of the feature
+file using ReStructured Text markup.
+
+=head1 BUGS
+
+Report bugs to Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
+
+=head1 COPYRIGHT
+
+Copyright (c) 2019 by Mauro Carvalho Chehab <mchehab+samsung@kernel.org>.
+
+License GPLv2: GNU GPL version 2 <http://gnu.org/licenses/gpl.html>.
+
+This is free software: you are free to change and redistribute it.
+There is NO WARRANTY, to the extent permitted by law.
+
+=cut