06 Sep, 2019
1 commit
-
commit 5f3e2bf008c2221478101ee72f5cb4654b9fc363 upstream.
Some TCP peers announce a very small MSS option in their SYN and/or
SYN/ACK messages.This forces the stack to send packets with a very high network/cpu
overhead.Linux has enforced a minimal value of 48. Since this value includes
the size of TCP options, and that the options can consume up to 40
bytes, this means that each segment can include only 8 bytes of payload.In some cases, it can be useful to increase the minimal value
to a saner value.We still let the default to 48 (TCP_MIN_SND_MSS), for compatibility
reasons.Note that TCP_MAXSEG socket option enforces a minimal value
of (TCP_MIN_MSS). David Miller increased this minimal value
in commit c39508d6f118 ("tcp: Make TCP_MAXSEG minimum more correct.")
from 64 to 88.We might in the future merge TCP_MIN_SND_MSS and TCP_MIN_MSS.
CVE-2019-11479 -- tcp mss hardcoded to 48
Signed-off-by: Eric Dumazet
Suggested-by: Jonathan Looney
Acked-by: Neal Cardwell
Cc: Yuchung Cheng
Cc: Tyler Hicks
Cc: Bruce Curtis
Cc: Jonathan Lemon
Signed-off-by: David S. Miller
Signed-off-by: Greg Kroah-Hartman
(cherry picked from commit 7f9f8a37e563c67b24ccd57da1d541a95538e8d9)
27 Sep, 2018
1 commit
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(fix documentation and sysctl access to treat it as such)
Tested:
# zcat /proc/config.gz | egrep ^CONFIG_HZ
CONFIG_HZ_1000=y
CONFIG_HZ=1000
# echo $[(1<<
Signed-off-by: David S. Miller
24 Aug, 2018
1 commit
-
Pull ARM SoC driver updates from Olof Johansson:
"Some of the larger changes this merge window:- Removal of drivers for Exynos5440, a Samsung SoC that never saw
widespread use.- Uniphier support for USB3 and SPI reset handling
- Syste control and SRAM drivers and bindings for Allwinner platforms
- Qualcomm AOSS (Always-on subsystem) reset controller drivers
- Raspberry Pi hwmon driver for voltage
- Mediatek pwrap (pmic) support for MT6797 SoC"
* tag 'armsoc-drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (52 commits)
drivers/firmware: psci_checker: stash and use topology_core_cpumask for hotplug tests
soc: fsl: cleanup Kconfig menu
soc: fsl: dpio: Convert DPIO documentation to .rst
staging: fsl-mc: Remove remaining files
staging: fsl-mc: Move DPIO from staging to drivers/soc/fsl
staging: fsl-dpaa2: eth: move generic FD defines to DPIO
soc: fsl: qe: gpio: Add qe_gpio_set_multiple
usb: host: exynos: Remove support for Exynos5440
clk: samsung: Remove support for Exynos5440
soc: sunxi: Add the A13, A23 and H3 system control compatibles
reset: uniphier: add reset control support for SPI
cpufreq: exynos: Remove support for Exynos5440
ata: ahci-platform: Remove support for Exynos5440
soc: imx6qp: Use GENPD_FLAG_ALWAYS_ON for PU errata
soc: mediatek: pwrap: add mt6351 driver for mt6797 SoCs
soc: mediatek: pwrap: add pwrap driver for mt6797 SoCs
soc: mediatek: pwrap: fix cipher init setting error
dt-bindings: pwrap: mediatek: add pwrap support for MT6797
reset: uniphier: add USB3 core reset control
dt-bindings: reset: uniphier: add USB3 core reset support
...
19 Aug, 2018
1 commit
-
Pablo Neira Ayuso says:
====================
Netfilter/IPVS fixes for netThe following patchset contains Netfilter/IPVS fixes for your net tree:
1) Infinite loop in IPVS when net namespace is released, from
Tan Hu.2) Do not show negative timeouts in ip_vs_conn by using the new
jiffies_delta_to_msecs(), patches from Matteo Croce.3) Set F_IFACE flag for linklocal addresses in ip6t_rpfilter,
from Florian Westphal.4) Fix overflow in set size allocation, from Taehee Yoo.
5) Use netlink_dump_start() from ctnetlink to fix memleak from
the error path, again from Florian.6) Register nfnetlink_subsys in last place, otherwise netns
init path may lose race and see net->nft uninitialized data.
This also reverts previous attempt to fix this by increase
netns refcount, patches from Florian.7) Remove conntrack entries on layer 4 protocol tracker module
removal, from Florian.8) Use GFP_KERNEL_ACCOUNT for xtables blob allocation, from
Michal Hocko.9) Get tproxy documentation in sync with existing codebase,
from Mate Eckl.10) Honor preset layer 3 protocol via ctx->family in the new nft_ct
timeout infrastructure, from Harsha Sharma.11) Let uapi nfnetlink_osf.h compile standalone with no errors,
from Dmitry V. Levin.12) Missing braces compilation warning in nft_tproxy, patch from
Mate Eclk.13) Disregard bogus check to bail out on non-anonymous sets from
the dynamic set update extension.
====================Signed-off-by: David S. Miller
17 Aug, 2018
2 commits
-
If set cbs parameters calculated for 1000Mb, but use on 100Mb port
w/o h/w offload (for cpsw offload it doesn't matter), it works
incorrectly. According to the example and testing board, second port
is 100Mb interface. Correct them on recalculated for 100Mb interface.
It allows to use the same command for CBS software implementation for
board in example.Signed-off-by: Ivan Khoronzhuk
Signed-off-by: David S. Miller -
Recently, transparent proxy support has been added to nf_tables so that
this document should be updated with the new information.- Nft commands are added as alternatives to iptables ones.
- The link for a patched iptables is removed as it is already part of
the mainline iptables implementation (and the link is dead).
- tcprdr is added as an example implementation of a transparent proxyCc: "David S. Miller"
Cc: Jonathan Corbet
Cc: Florian Westphal
Cc: KOVACS Krisztian
Cc: Pablo Neira Ayuso
Cc: linux-doc@vger.kernel.org
Signed-off-by: Máté Eckl
Signed-off-by: Pablo Neira Ayuso
13 Aug, 2018
1 commit
-
Preventing the kernel from responding to ICMP Echo Requests messages
can be useful in several ways. The sysctl parameter
'icmp_echo_ignore_all' can be used to prevent the kernel from
responding to IPv4 ICMP echo requests. For IPv6 pings, such
a sysctl kernel parameter did not exist.Add the ability to prevent the kernel from responding to IPv6
ICMP echo requests through the use of the following sysctl
parameter : /proc/sys/net/ipv6/icmp/echo_ignore_all.
Update the documentation to reflect this change.Signed-off-by: Virgile Jarry
Signed-off-by: David S. Miller
03 Aug, 2018
1 commit
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The BTF conflicts were simple overlapping changes.
The virtio_net conflict was an overlap of a fix of statistics counter,
happening alongisde a move over to a bonafide statistics structure
rather than counting value on the stack.Signed-off-by: David S. Miller
02 Aug, 2018
2 commits
-
After IPv4 packets are forwarded, the priority of the corresponding SKB
is updated according to the TOS field of IPv4 header. This overrides any
prioritization done earlier by e.g. an skbedit action or ingress-qos-map
defined at a vlan device.Such overriding may not always be desirable. Even if the packet ends up
being routed, which implies this is an L3 network node, an administrator
may wish to preserve whatever prioritization was done earlier on in the
pipeline.Therefore introduce a sysctl that controls this behavior. Keep the
default value at 1 to maintain backward-compatible behavior.Signed-off-by: Petr Machata
Reviewed-by: Ido Schimmel
Signed-off-by: David S. Miller -
Add overline heading adornment to document title in order to comply
with kernel doc requirements.Fixes: 60b9131 staging: fsl-mc: Convert documentation to rst format
Signed-off-by: Ioana Ciornei
Signed-off-by: David S. Miller
27 Jul, 2018
2 commits
-
The UCAN driver supports the microcontroller-based USB/CAN
adapters from Theobroma Systems. There are two form-factors
that run essentially the same firmware:* Seal: standalone USB stick ( https://www.theobroma-systems.com/seal )
* Mule: integrated on the PCB of various System-on-Modules from
Theobroma Systems like the A31-µQ7 and the RK3399-Q7
( https://www.theobroma-systems.com/rk3399-q7 )The USB wire protocol has been designed to be as generic and
hardware-indendent as possible in the hope of being useful for
implementation on other microcontrollers.Signed-off-by: Martin Elshuber
Signed-off-by: Jakob Unterwurzacher
Signed-off-by: Philipp Tomsich
Acked-by: Wolfgang Grandegger
Signed-off-by: Marc Kleine-Budde -
Preferred kernel docs format is now restructured text. Convert
netdev-FAQ.txt to restructured text.- Add SPDX license identifier.
- Change file heading 'Information you need to know about netdev' to
'netdev FAQ' to better suit displayed index (in HTML).- Change question/answer layout to suit rst. Copy format in
Documentation/bpf/bpf_devel_QA.rst- Fix indentation of code snippets
- If multiple consecutive URLs appear put them in a list (to maintain
whitespace).- Use uniform spelling of 'bug fix' throughout document (not bugfix or
bug-fix).- Add double back ticks to 'net' and 'net-next' when referring to the
trees.- Use rst references for Documentation/ links.
- Add rst label 'netdev-FAQ' for referencing by other docs files.
- Remove stale entry from Documentation/networking/00-INDEX
Signed-off-by: Tobin C. Harding
Signed-off-by: David S. Miller
26 Jul, 2018
1 commit
-
…o/linux into next/drivers
Various updates to soc/fsl for 4.19
Moves DPAA2 DPIO driver from staging to fsl/soc
Adds multiple-pin support to QE gpio driver* tag 'soc-fsl-for-4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/leo/linux:
soc: fsl: cleanup Kconfig menu
soc: fsl: dpio: Convert DPIO documentation to .rst
staging: fsl-mc: Remove remaining files
staging: fsl-mc: Move DPIO from staging to drivers/soc/fsl
staging: fsl-dpaa2: eth: move generic FD defines to DPIO
soc: fsl: qe: gpio: Add qe_gpio_set_multipleSigned-off-by: Olof Johansson <olof@lixom.net>
25 Jul, 2018
1 commit
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Convert the Datapath I/O documentation to .rst format
and move to the Documation/networking/dpaa2 directorySigned-off-by: Roy Pledge
Reviewed-by: Horia Geantă
Reviewed-by: Ioana Radulescu
Signed-off-by: Li Yang
24 Jul, 2018
1 commit
-
This document describes MQPRIO and CBS Qdisc offload configuration
for cpsw driver based on examples. It potentially can be used in
audio video bridging (AVB) and time sensitive networking (TSN).Reviewed-by: Ilias Apalodimas
Reviewed-by: Grygorii Strashko
Signed-off-by: Ivan Khoronzhuk
Signed-off-by: David S. Miller
21 Jul, 2018
1 commit
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All conflicts were trivial overlapping changes, so reasonably
easy to resolve.Signed-off-by: David S. Miller
19 Jul, 2018
2 commits
-
The kernel documentation is now restructured text. Convert the Ethernet
Bridge documentation and include it in the toplevel kernel
documentation.- Fix heading adornments.
- Add license identifier.Signed-off-by: Tobin C. Harding
Signed-off-by: David S. Miller -
The kernel documentation is now restructured text. Convert the IP
aliasing documentation and include it in the toplevel kernel
documentation.- Fix heading adornments.
- Correctly indent code snippets.
- Limit line length to 72 characters inline with kernel documentation
standards.
- Add license identifier.Signed-off-by: Tobin C. Harding
Signed-off-by: David S. Miller
17 Jul, 2018
3 commits
-
This patch fixes a spelling typo in bonding.txt
Signed-off-by: Masanari Iida
Signed-off-by: David S. Miller -
Currently building the net_failover docs causes a bunch of warnings to
be emitted. These warnings are all related to indentation and correctly
highlight missing '::' (for code sections). It looks, from other rst
files in Documentation, that the first column should be indented 2
spaces.Add '::' before code snippets and indent all snippets uniformly starting
with 2 spaces.Cc: Jonathan Corbet
Signed-off-by: Tobin C. Harding
Signed-off-by: David S. Miller -
Currently we have rst format docs for the failover and net_failover
modules however these docs are not linked to within the index.Add `failover` and `net_failover` to the networking documentation index.
Signed-off-by: Tobin C. Harding
Signed-off-by: David S. Miller
12 Jul, 2018
3 commits
-
Documentation/networking/e1000.rst:83: ERROR: Unexpected indentation.
Documentation/networking/e1000.rst:84: WARNING: Block quote ends without a blank line; unexpected unindent.
Documentation/networking/e1000.rst:173: WARNING: Definition list ends without a blank line; unexpected unindent.
Documentation/networking/e1000.rst:236: WARNING: Definition list ends without a blank line; unexpected unindent.While here, fix highlights and mark a table as such.
Signed-off-by: Mauro Carvalho Chehab
Signed-off-by: Jeff Kirsher -
Documentation/networking/e100.rst:57: WARNING: Literal block expected; none found.
Documentation/networking/e100.rst:68: WARNING: Literal block expected; none found.
Documentation/networking/e100.rst:75: WARNING: Literal block expected; none found.
Documentation/networking/e100.rst:84: WARNING: Literal block expected; none found.
Documentation/networking/e100.rst:93: WARNING: Inline emphasis start-string without end-string.While here, fix some highlights.
Signed-off-by: Mauro Carvalho Chehab
Signed-off-by: Jeff Kirsher -
addr_gen_mode was introduced in without documentation, add it now.
Fixes: d35a00b8e33d ("net/ipv6: allow sysctl to change link-local address generation mode")
Signed-off-by: Sabrina Dubroca
Reviewed-by: David Ahern
Signed-off-by: David S. Miller
02 Jul, 2018
1 commit
-
Signed-off-by: Amritha Nambiar
Signed-off-by: David S. Miller
28 Jun, 2018
1 commit
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The sock reference is lost when scrubbing the packet and that breaks
TSQ (TCP Small Queues) and XPS (Transmit Packet Steering) causing
performance impacts of about 50% in a single TCP stream when crossing
network namespaces.XPS breaks because the queue mapping stored in the socket is not
available, so another random queue might be selected when the stack
needs to transmit something like a TCP ACK, or TCP Retransmissions.
That causes packet re-ordering and/or performance issues.TSQ breaks because it orphans the packet while it is still in the
host, so packets are queued contributing to the buffer bloat problem.Preserving the sock reference fixes both issues. The socket is
orphaned anyways in the receiving path before any relevant action
and on TX side the netfilter checks if the reference is local before
use it.Signed-off-by: Flavio Leitner
Signed-off-by: David S. Miller
24 Jun, 2018
1 commit
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Replaced strp_pause() with strp_unpause() to correct a seemingly copy
paste documentation mistake.Signed-off-by: Vakul Garg
Signed-off-by: David S. Miller
23 Jun, 2018
4 commits
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Recent patch updated e1000 docs to rst format. Docs build (`make
htmldocs`) is currently failing due to this file with error:(SEVERE/4) Unexpected section title.
This is because a section of the file is indented 2 spaces. Build error
can be cleared by aligning the text with column 0. While we are changing
these lines we can make sure line length does not exceed 72, that
newlines following headings are uniform, and that full stops are
followed by two spaces.Align text with column 0, limit line length to 72, ensure two spaces
follow all full stops, ensure uniform use of newlines after heading.Fixes commit (228046e76189 Documentation: e1000: Update kernel documentation)
CC: Jeff Kirsher
Signed-off-by: Tobin C. Harding
Acked-by: Jeff Kirsher
Signed-off-by: David S. Miller -
Recent patch updated e100 docs to rst format. Docs build (`make
htmldocs`) is currently failing due to this file with error:(SEVERE/4) Unexpected section title.
This is because a section of the file is indented 2 spaces. Build error
can be cleared by aligning the text with column 0. While we are changing
these lines we can make sure line length does not exceed 72, that
newlines following headings are uniform, and that full stops are
followed by two spaces.Align text with column 0, limit line length to 72, ensure two spaces
follow all full stops, ensure uniform use of newlines after heading.Fixes commit (85d63445f411 Documentation: e100: Update the Intel 10/100 driver doc)
CC: Jeff Kirsher
Signed-off-by: Tobin C. Harding
Acked-by: Jeff Kirsher
Signed-off-by: David S. Miller -
Recently documentation file was converted to rst. The document title
has the incorrect heading adornment. From kernel docs:* Please stick to this order of heading adornments:
1. ``=`` with overline for document title::
==============
Document title
==============Add overline heading adornment to document title.
Fixes commit (228046e76189 Documentation: e1000: Update kernel documentation)
CC: Jeff Kirsher
Signed-off-by: Tobin C. Harding
Acked-by: Jeff Kirsher
Signed-off-by: David S. Miller -
Recently documentation file was converted to rst. The document title
has the incorrect heading adornment. From kernel docs:* Please stick to this order of heading adornments:
1. ``=`` with overline for document title::
==============
Document title
==============Add overline heading adornment to document title.
Fixes commit (85d63445f411 Documentation: e100: Update the Intel 10/100 driver doc)
CC: Jeff Kirsher
Signed-off-by: Tobin C. Harding
Acked-by: Jeff Kirsher
Signed-off-by: David S. Miller
15 Jun, 2018
1 commit
-
As stated at:
http://www.sphinx-doc.org/en/master/usage/restructuredtext/basics.html#footnotesA footnote should contain either a number, a reference or
an auto number, e. g.:
[1], [#f1] or [#].While using [*] accidentaly works for html, it fails for other
document outputs. In particular, it causes an error with LaTeX
output, causing all books after networking to not be built.So, replace it by a valid syntax.
Acked-by: Oliver Hartkopp
Signed-off-by: Mauro Carvalho Chehab
Acked-by: Jonathan Corbet
06 Jun, 2018
2 commits
-
Per discussion with David at netconf 2018, let's clarify
DaveM's position of handling stable backports in netdev-FAQ.This is important for people relying on upstream -stable
releases.Cc: Greg Kroah-Hartman
Signed-off-by: Cong Wang
Signed-off-by: David S. Miller -
Daniel Borkmann says:
====================
pull-request: bpf-next 2018-06-05The following pull-request contains BPF updates for your *net-next* tree.
The main changes are:
1) Add a new BPF hook for sendmsg similar to existing hooks for bind and
connect: "This allows to override source IP (including the case when it's
set via cmsg(3)) and destination IP:port for unconnected UDP (slow path).
TCP and connected UDP (fast path) are not affected. This makes UDP support
complete, that is, connected UDP is handled by connect hooks, unconnected
by sendmsg ones.", from Andrey.2) Rework of the AF_XDP API to allow extending it in future for type writer
model if necessary. In this mode a memory window is passed to hardware
and multiple frames might be filled into that window instead of just one
that is the case in the current fixed frame-size model. With the new
changes made this can be supported without having to add a new descriptor
format. Also, core bits for the zero-copy support for AF_XDP have been
merged as agreed upon, where i40e bits will be routed via Jeff later on.
Various improvements to documentation and sample programs included as
well, all from Björn and Magnus.3) Given BPF's flexibility, a new program type has been added to implement
infrared decoders. Quote: "The kernel IR decoders support the most
widely used IR protocols, but there are many protocols which are not
supported. [...] There is a 'long tail' of unsupported IR protocols,
for which lircd is need to decode the IR. IR encoding is done in such
a way that some simple circuit can decode it; therefore, BPF is ideal.
[...] user-space can define a decoder in BPF, attach it to the rc
device through the lirc chardev.", from Sean.4) Several improvements and fixes to BPF core, among others, dumping map
and prog IDs into fdinfo which is a straight forward way to correlate
BPF objects used by applications, removing an indirect call and therefore
retpoline in all map lookup/update/delete calls by invoking the callback
directly for 64 bit archs, adding a new bpf_skb_cgroup_id() BPF helper
for tc BPF programs to have an efficient way of looking up cgroup v2 id
for policy or other use cases. Fixes to make sure we zero tunnel/xfrm
state that hasn't been filled, to allow context access wrt pt_regs in
32 bit archs for tracing, and last but not least various test cases
for fixes that landed in bpf earlier, from Daniel.5) Get rid of the ndo_xdp_flush API and extend the ndo_xdp_xmit with
a XDP_XMIT_FLUSH flag instead which allows to avoid one indirect
call as flushing is now merged directly into ndo_xdp_xmit(), from Jesper.6) Add a new bpf_get_current_cgroup_id() helper that can be used in
tracing to retrieve the cgroup id from the current process in order
to allow for e.g. aggregation of container-level events, from Yonghong.7) Two follow-up fixes for BTF to reject invalid input values and
related to that also two test cases for BPF kselftests, from Martin.8) Various API improvements to the bpf_fib_lookup() helper, that is,
dropping MPLS bits which are not fully hashed out yet, rejecting
invalid helper flags, returning error for unsupported address
families as well as renaming flowlabel to flowinfo, from David.9) Various fixes and improvements to sockmap BPF kselftests in particular
in proper error detection and data verification, from Prashant.10) Two arm32 BPF JIT improvements. One is to fix imm range check with
regards to whether immediate fits into 24 bits, and a naming cleanup
to get functions related to rsh handling consistent to those handling
lsh, from Wang.11) Two compile warning fixes in BPF, one for BTF and a false positive
to silent gcc in stack_map_get_build_id_offset(), from Arnd.12) Add missing seg6.h header into tools include infrastructure in order
to fix compilation of BPF kselftests, from Mathieu.13) Several formatting cleanups in the BPF UAPI helper description that
also fix an error during rst2man compilation, from Quentin.14) Hide an unused variable in sk_msg_convert_ctx_access() when IPv6 is
not built into the kernel, from Yue.15) Remove a useless double assignment in dev_map_enqueue(), from Colin.
====================Signed-off-by: David S. Miller
05 Jun, 2018
5 commits
-
Jeff Kirsher says:
====================
Intel Wired LAN Driver Updates 2018-06-04This series contains a smorgasbord of updates to documentation, e1000e,
igb, ixgbe, ixgbevf and i40e.Benjamin Poirier fixes a potential kernel crash due to NULL pointer
dereference in e1000e.Jeff updates the kernel documentation for e100 and e1000 to correct
default values and URLs which were incorrect in the documentation. Also
took the time to update these to the new reStructured text format for
kernel documentation.Joanna Yurdal fixes a missing PTP transmit timestamp by ensuring that
TSICR gets cleared when ICR is cleared.Sergey updates igb to reset all the transmit queues at one time so that
we only have to wait once for all the queues to be reset.Alex fixes ixgbevf so that malicious driver detection (MDD) can co-exist
with XDP.Emil and Tony extend the RTNL lock to ensure we get the most up-to-date
values for the bits and avoid a possible race condition when going down.YueHaibing from Huawei introduces a helper function in ixgbe for
operation reads to simplify the code a bit more.Daniel Borkmann adds support for XDP meta data when using build SKB
for i40e.Shannon Nelson provides twp fixes for the IPSec code in ixgbe, first is
to make sure we do not try to offload the decryption of any incoming
packet that is destined for the management engine. The other fix is to
resolve a cast problem introduced by a sparse cleanup patch.
====================Signed-off-by: David S. Miller
-
This patch fixes some typos/misspelling errors in the
Documentation/networking files.Signed-off-by: Olivier Gayot
Signed-off-by: David S. Miller -
This changes the /proc/sys/net/ipv4/tcp_tw_reuse from a boolean
to an integer.It now takes the values 0, 1 and 2, where 0 and 1 behave as before,
while 2 enables timewait socket reuse only for sockets that we can
prove are loopback connections:
ie. bound to 'lo' interface or where one of source or destination
IPs is 127.0.0.0/8, ::ffff:127.0.0.0/104 or ::1.This enables quicker reuse of ephemeral ports for loopback connections
- where tcp_tw_reuse is 100% safe from a protocol perspective
(this assumes no artificially induced packet loss on 'lo').This also makes estblishing many loopback connections *much* faster
(allocating ports out of the first half of the ephemeral port range
is significantly faster, then allocating from the second half)Without this change in a 32K ephemeral port space my sample program
(it just establishes and closes [::1]:ephemeral -> [::1]:server_port
connections in a tight loop) fails after 32765 connections in 24 seconds.
With it enabled 50000 connections only take 4.7 seconds.This is particularly problematic for IPv6 where we only have one local
address and cannot play tricks with varying source IP from 127.0.0.0/8
pool.Signed-off-by: Maciej Żenczykowski
Cc: Neal Cardwell
Cc: Yuchung Cheng
Cc: Wei Wang
Change-Id: I0377961749979d0301b7b62871a32a4b34b654e1
Signed-off-by: Eric Dumazet
Signed-off-by: David S. Miller -
Updated the e1000.txt kernel documentation with the latest information.
Also convert the text file to reStructuredText (RST) format, since the
Linux kernel documentation now uses this format for documentation.Signed-off-by: Jeff Kirsher
Tested-by: Aaron Brown -
Over the years, several of the links have changed or are no longer valid
so update them. In addition, the default values were incorrect for a
couple of parameters.Converted the text file to the reStructuredText (RST) format, since the
Linux kernel documentation now uses this format for documentation.Signed-off-by: Jeff Kirsher
Tested-by: Aaron Brown
04 Jun, 2018
1 commit
-
Currently, AF_XDP only supports a fixed frame-size memory scheme where
each frame is referenced via an index (idx). A user passes the frame
index to the kernel, and the kernel acts upon the data. Some NICs,
however, do not have a fixed frame-size model, instead they have a
model where a memory window is passed to the hardware and multiple
frames are filled into that window (referred to as the "type-writer"
model).By changing the descriptor format from the current frame index
addressing scheme, AF_XDP can in the future be extended to support
these kinds of NICs.In the index-based model, an idx refers to a frame of size
frame_size. Addressing a frame in the UMEM is done by offseting the
UMEM starting address by a global offset, idx * frame_size + offset.
Communicating via the fill- and completion-rings are done by means of
idx.In this commit, the idx is removed in favor of an address (addr),
which is a relative address ranging over the UMEM. To convert an
idx-based address to the new addr is simply: addr = idx * frame_size +
offset.We also stop referring to the UMEM "frame" as a frame. Instead it is
simply called a chunk.To transfer ownership of a chunk to the kernel, the addr of the chunk
is passed in the fill-ring. Note, that the kernel will mask addr to
make it chunk aligned, so there is no need for userspace to do
that. E.g., for a chunk size of 2k, passing an addr of 2048, 2050 or
3000 to the fill-ring will refer to the same chunk.On the completion-ring, the addr will match that of the Tx descriptor,
passed to the kernel.Changing the descriptor format to use chunks/addr will allow for
future changes to move to a type-writer based model, where multiple
frames can reside in one chunk. In this model passing one single chunk
into the fill-ring, would potentially result in multiple Rx
descriptors.This commit changes the uapi of AF_XDP sockets, and updates the
documentation.Signed-off-by: Björn Töpel
Signed-off-by: Daniel Borkmann
