From 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Tue, 21 Feb 2023 18:24:12 -0800 Subject: Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next 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(). ... --- scripts/get_feat.pl | 641 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 641 insertions(+) create mode 100755 scripts/get_feat.pl (limited to 'scripts/get_feat.pl') 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() { + $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 [--debug] [--man] [--help] [--dir=] [--arch=] + [--feature=|--feat=] [] + +Where can be: + +=over 8 + +B - output table in ReST compatible ASCII format + with features for this machine's architecture + +B - 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 the contents of the files under + Documentation/features. + +B or B - 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 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 + +=head1 COPYRIGHT + +Copyright (c) 2019 by Mauro Carvalho Chehab . + +License GPLv2: GNU GPL version 2 . + +This is free software: you are free to change and redistribute it. +There is NO WARRANTY, to the extent permitted by law. + +=cut -- cgit v1.2.3