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2011-10-06net: fix typos in Documentation/networking/scaling.txtBenjamin Poirier1-5/+5
The second hunk fixes rps_sock_flow_table but has to re-wrap the paragraph. Signed-off-by: Benjamin Poirier <benjamin.poirier@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-09-29net: Documentation: Fix type of variablesRoy.Li1-2/+2
Signed-off-by: Roy.Li <rongqing.li@windriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-09-27net: fix a typo in Documentation/networking/scaling.txtJason Wang1-1/+1
Signed-off-by: Jason Wang <jasowang@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-09-15Documentation: networking: dmfe.txt: Remove the maintainer of orphan ↵Marcos Paulo de Souza1-1/+2
networking driver The dmfe module is a orphan driver, and with this was removed the maintainer of the documentation. Signed-off-by: Marcos Paulo de Souza <marcos.mage@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-08-22net: Documentation: RFC 2553bis is now RFC 3493Geoffrey Thomas1-1/+1
Signed-off-by: Geoffrey Thomas <geofft@mit.edu> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-08-18net: netdev-features.txt update to Documentation/networking/00-INDEXWillem de Bruijn1-1/+1
Update netdev-features.txt entry in 00-INDEX to incorporate feedback by Michał Mirosław. v2: restored tabs that were inadvertently changed to spaces in v1. sorry for the error. Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-08-13net: minor update to Documentation/networking/scaling.txtWillem de Bruijn1-8/+15
Incorporate last comments about hyperthreading, interrupt coalescing and the definition of cache domains into the network scaling document scaling.txt Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-08-13net: add missing entries to Documentation/networking/00-INDEXWillem de Bruijn1-0/+116
A simple janitor duty patch that adds a one sentence overview to 00-INDEX for all files that lacked it. - does not add entries for subdirectories - does not modify existing entries. Signed-off-by: David S. Miller <davem@davemloft.net>
2011-08-10net: add Documentation/networking/scaling.txtWillem de Bruijn1-0/+371
Describes RSS, RPS, RFS, accelerated RFS, and XPS. This version incorporates comments by Randy Dunlap and Rick Jones. Besides text cleanup, it adds an explicit "Suggested Configuration" heading to each section. Signed-off-by: Willem de Bruijn <willemb@google.com> Acked-By: Rick Jones <rick.jones2@hp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-08-07bonding: document two undocumented options.Nicolas de Pesloüan1-0/+29
Commit 655f8919d549ad1872e24d826b6ce42530516d2e bonding: add min links parameter to 802.3ad and commit ebd8e4977a87cb81d93c62a9bff0102a9713722f bonding: add all_slaves_active parameter introduced new options to bonding, but didn't provide the documentation for those options. V2: add the default value for both options. V3: document the exact behavior of min_links default value. Signed-off-by: Nicolas de Pesloüan <nicolas.2p.debian@free.fr> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-08-01Documentation/bonding.txt: Update to 3.x version numbersJesper Juhl1-1/+1
Signed-off-by: Jesper Juhl <jj@chaosbits.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-07-21stmmac: improve and up-to-date the documentationGiuseppe CAVALLARO1-64/+136
This patch adds new information for the driver especially about its platform structure fields. Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-07-14Merge branch 'master' of ↵David S. Miller1-1/+1
master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 Conflicts: net/bluetooth/l2cap_core.c
2011-07-12net: Add documentation for netdev features handlingMichał Mirosław1-0/+154
v2: incorporated suggestions from Randy Dunlap Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-07-08net: Fix default in docs for tcp_orphan_retries.David S. Miller1-1/+1
Default should be listed at 8 instead of 7. Reported-by: Denys Fedoryshchenko <denys@visp.net.lb> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-07-08Merge branch 'master' of ↵John W. Linville1-0/+128
git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next-2.6 into for-davem
2011-07-07net: doc: fix compile warning of no format arguments in ifenslave.cShan Wei1-9/+9
Fix following warning in ifenslave.c with gcc version 4.5.2 (Ubuntu/Linaro 4.5.2-8ubuntu4). Documentation/networking/ifenslave.c:263:4: warning: format not a string literal and no format arguments Documentation/networking/ifenslave.c:271:3: warning: format not a string literal and no format arguments Documentation/networking/ifenslave.c:277:3: warning: format not a string literal and no format arguments Documentation/networking/ifenslave.c:285:3: warning: format not a string literal and no format arguments Documentation/networking/ifenslave.c:291:3: warning: format not a string literal and no format arguments Documentation/networking/ifenslave.c:292:3: warning: format not a string literal and no format arguments Documentation/networking/ifenslave.c:312:4: warning: format not a string literal and no format arguments Documentation/networking/ifenslave.c:323:3: warning: format not a string literal and no format arguments Documentation/networking/ifenslave.c:342:4: warning: format not a string literal and no format arguments Signed-off-by: Shan Wei <shanwei@cn.fujitsu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-07-05NFC: add Documentation/networking/nfc.txtAloisio Almeida Jr1-0/+128
Signed-off-by: Aloisio Almeida Jr <aloisio.almeida@openbossa.org> Signed-off-by: Lauro Ramos Venancio <lauro.venancio@openbossa.org> Signed-off-by: John W. Linville <linville@tuxdriver.com>
2011-07-04Update documented default values for various TCP/UDP tunablesMax Matveev1-4/+4
tcp_rmem and tcp_wmem use 1 page as default value for the minimum amount of memory to be used, same as udp_wmem_min and udp_rmem_min. Pages are different size on different architectures - use the right units when describing the defaults. Reviewed-by: Shan Wei <shanwei@cn.fujitsu.com> Acked-by: Neil Horman <nhorman@tuxdriver.com> Signed-off-by: Max Matveev <makc@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-07-04Update description of net.sctp.sctp_rmem and net.sctp.sctp_wmem tunablesMax Matveev1-2/+9
sctp does not use second and third ("default" and "max") values of sctp_rmem tunable. The format is the same as tcp_rmem but the meaning is different so make the documentation explicit to avoid confusion. sctp_wmem is not used at all. Acked-by: Neil Horman <nhorman@tuxdriver.com> Signed-off-by: Max Matveev <makc@redhat.com> Reviewed-by: Shan Wei <shanwei@cn.fujitsu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-06-08inetpeer: remove unused listEric Dumazet1-10/+0
Andi Kleen and Tim Chen reported huge contention on inetpeer unused_peers.lock, on memcached workload on a 40 core machine, with disabled route cache. It appears we constantly flip peers refcnt between 0 and 1 values, and we must insert/remove peers from unused_peers.list, holding a contended spinlock. Remove this list completely and perform a garbage collection on-the-fly, at lookup time, using the expired nodes we met during the tree traversal. This removes a lot of code, makes locking more standard, and obsoletes two sysctls (inet_peer_gc_mintime and inet_peer_gc_maxtime). This also removes two pointers in inet_peer structure. There is still a false sharing effect because refcnt is in first cache line of object [were the links and keys used by lookups are located], we might move it at the end of inet_peer structure to let this first cache line mostly read by cpus. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> CC: Andi Kleen <andi@firstfloor.org> CC: Tim Chen <tim.c.chen@linux.intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-05-27Merge branch 'docs-move' of ↵Linus Torvalds1-2/+2
git://git.kernel.org/pub/scm/linux/kernel/git/rdunlap/linux-docs * 'docs-move' of git://git.kernel.org/pub/scm/linux/kernel/git/rdunlap/linux-docs: Create Documentation/security/, move LSM-, credentials-, and keys-related files from Documentation/ to Documentation/security/, add Documentation/security/00-INDEX, and update all occurrences of Documentation/<moved_file> to Documentation/security/<moved_file>.
2011-05-25bonding: documentation and code cleanup for resend_igmpFlavio Leitner1-2/+11
Improves the documentation about how IGMP resend parameter works, fix two missing checks and coding style issues. Signed-off-by: Flavio Leitner <fbl@redhat.com> Acked-by: Rick Jones <rick.jones2@hp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-05-19Create Documentation/security/,Randy Dunlap1-2/+2
move LSM-, credentials-, and keys-related files from Documentation/ to Documentation/security/, add Documentation/security/00-INDEX, and update all occurrences of Documentation/<moved_file> to Documentation/security/<moved_file>.
2011-05-08Merge branch 'batman-adv/next' of git://git.open-mesh.org/ecsv/linux-mergeDavid S. Miller1-5/+6
2011-05-08batman-adv: rename everything from *hna* into *tt* (translation table)Antonio Quartulli1-5/+6
To be coherent, all the functions/variables/constants have been renamed to the TranslationTable style Signed-off-by: Antonio Quartulli <ordex@autistici.org> Signed-off-by: Sven Eckelmann <sven@narfation.org>
2011-04-29ipv4, ipv6, bonding: Restore control over number of peer notificationsBen Hutchings1-18/+16
For backward compatibility, we should retain the module parameters and sysfs attributes to control the number of peer notifications (gratuitous ARPs and unsolicited NAs) sent after bonding failover. Also, it is possible for failover to take place even though the new active slave does not have link up, and in that case the peer notification should be deferred until it does. Change ipv4 and ipv6 so they do not automatically send peer notifications on bonding failover. Change the bonding driver to send separate NETDEV_NOTIFY_PEERS notifications when the link is up, as many times as requested. Since it does not directly control which protocols send notifications, make num_grat_arp and num_unsol_na aliases for a single parameter. Bump the bonding version number and update its documentation. Signed-off-by: Ben Hutchings <bhutchings@solarflare.com> Signed-off-by: Jay Vosburgh <fubar@us.ibm.com> Acked-by: Brian Haley <brian.haley@hp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-04-13igb: Add anti-spoofing feature documentationGreg Rose1-0/+13
Add the documentation for the anti-spoofing feature in the HW. Signed-off-by: Greg Rose <gregory.v.rose@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
2011-04-07Merge branch 'for-linus2' of git://git.profusion.mobi/users/lucas/linux-2.6Linus Torvalds11-13/+13
* 'for-linus2' of git://git.profusion.mobi/users/lucas/linux-2.6: Fix common misspellings
2011-04-04Documentation: fix minor typos/spellingSylvestre Ledru1-1/+1
Fix some minor typos: * informations => information * there own => their own * these => this Signed-off-by: Sylvestre Ledru <sylvestre.ledru@scilab.org> Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-03-31Fix common misspellingsLucas De Marchi11-13/+13
Fixes generated by 'codespell' and manually reviewed. Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
2011-03-15Merge branch 'master' of ↵David S. Miller1-9/+17
master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
2011-03-14bonding: documentation update: mailing lists.Nicolas de Pesloüan1-9/+17
In commit a6c36ee677607b02d8ecc88e8a12785418b88107 ("bonding: change list contact to netdev@vger.kernel.org"), the mailing list for bonding developpement was changed from bonding-devel to netdev. Update the bonding documentation to reflect this change: - bonding-devel is used for usage discussions (despite the name). - netdev is used for developpement discussions. Also remove the reference to the sourceforge bonding page, which is deprecated. Signed-off-by: Nicolas de Pesloüan <nicolas.2p.debian@free.fr> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-03-09Phonet: kill the ST-Ericsson pipe controller KconfigRémi Denis-Courmont1-13/+0
This is now a run-time choice so that a single kernel can support both old and new generation ISI modems. Support for manually enabling the pipe flow is removed as it did not work properly, does not fit well with the socket API, and I am not aware of any use at the moment. Signed-off-by: Rémi Denis-Courmont <remi.denis-courmont@nokia.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-03-09Phonet: support active connection without pipe controller on modemRémi Denis-Courmont1-29/+24
This provides support for newer ISI modems with no need for the earlier experimental compile-time alternative choice. With this, we can now use the same kernel and userspace with both types of modems. This also avoids confusing two different and incompatible state machines, actively connected vs accepted sockets, and adds connection response error handling (processing "SYN/RST" of sorts). Signed-off-by: Rémi Denis-Courmont <remi.denis-courmont@nokia.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-03-09Phonet: provide pipe socket option to retrieve the pipe identifierRémi Denis-Courmont1-3/+4
User-space sometimes needs this information. In particular, the GPRS context or the AT commands pipe setups may use the pipe handle as a reference. This removes the settable pipe handle with CONFIG_PHONET_PIPECTRLR. It did not handle error cases correctly. Furthermore, the kernel *could* implement a smart scheme for allocating handles (if ever needed), but userspace really cannot. Signed-off-by: Rémi Denis-Courmont <remi.denis-courmont@nokia.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-03-03Merge branch 'master' of ↵David S. Miller2-7/+8
master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 Conflicts: drivers/net/bnx2x/bnx2x.h
2011-03-03Merge branch 'for-linus' of ↵Linus Torvalds1-1/+8
git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6: DNS: Fix a NULL pointer deref when trying to read an error key [CVE-2011-1076]
2011-03-04DNS: Fix a NULL pointer deref when trying to read an error key [CVE-2011-1076]David Howells1-1/+8
When a DNS resolver key is instantiated with an error indication, attempts to read that key will result in an oops because user_read() is expecting there to be a payload - and there isn't one [CVE-2011-1076]. Give the DNS resolver key its own read handler that returns the error cached in key->type_data.x[0] as an error rather than crashing. Also make the kenter() at the beginning of dns_resolver_instantiate() limit the amount of data it prints, since the data is not necessarily NUL-terminated. The buggy code was added in: commit 4a2d789267e00b5a1175ecd2ddefcc78b83fbf09 Author: Wang Lei <wang840925@gmail.com> Date: Wed Aug 11 09:37:58 2010 +0100 Subject: DNS: If the DNS server returns an error, allow that to be cached [ver #2] This can trivially be reproduced by any user with the following program compiled with -lkeyutils: #include <stdlib.h> #include <keyutils.h> #include <err.h> static char payload[] = "#dnserror=6"; int main() { key_serial_t key; key = add_key("dns_resolver", "a", payload, sizeof(payload), KEY_SPEC_SESSION_KEYRING); if (key == -1) err(1, "add_key"); if (keyctl_read(key, NULL, 0) == -1) err(1, "read_key"); return 0; } What should happen is that keyctl_read() reports error 6 (ENXIO) to the user: dns-break: read_key: No such device or address but instead the kernel oopses. This cannot be reproduced with the 'keyutils add' or 'keyutils padd' commands as both of those cut the data down below the NUL termination that must be included in the data. Without this dns_resolver_instantiate() will return -EINVAL and the key will not be instantiated such that it can be read. The oops looks like: BUG: unable to handle kernel NULL pointer dereference at 0000000000000010 IP: [<ffffffff811b99f7>] user_read+0x4f/0x8f PGD 3bdf8067 PUD 385b9067 PMD 0 Oops: 0000 [#1] SMP last sysfs file: /sys/devices/pci0000:00/0000:00:19.0/irq CPU 0 Modules linked in: Pid: 2150, comm: dns-break Not tainted 2.6.38-rc7-cachefs+ #468 /DG965RY RIP: 0010:[<ffffffff811b99f7>] [<ffffffff811b99f7>] user_read+0x4f/0x8f RSP: 0018:ffff88003bf47f08 EFLAGS: 00010246 RAX: 0000000000000001 RBX: ffff88003b5ea378 RCX: ffffffff81972368 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88003b5ea378 RBP: ffff88003bf47f28 R08: ffff88003be56620 R09: 0000000000000000 R10: 0000000000000395 R11: 0000000000000002 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: ffffffffffffffa1 FS: 00007feab5751700(0000) GS:ffff88003e000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000010 CR3: 000000003de40000 CR4: 00000000000006f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process dns-break (pid: 2150, threadinfo ffff88003bf46000, task ffff88003be56090) Stack: ffff88003b5ea378 ffff88003b5ea3a0 0000000000000000 0000000000000000 ffff88003bf47f68 ffffffff811b708e ffff88003c442bc8 0000000000000000 00000000004005a0 00007fffba368060 0000000000000000 0000000000000000 Call Trace: [<ffffffff811b708e>] keyctl_read_key+0xac/0xcf [<ffffffff811b7c07>] sys_keyctl+0x75/0xb6 [<ffffffff81001f7b>] system_call_fastpath+0x16/0x1b Code: 75 1f 48 83 7b 28 00 75 18 c6 05 58 2b fb 00 01 be bb 00 00 00 48 c7 c7 76 1c 75 81 e8 13 c2 e9 ff 4c 8b b3 e0 00 00 00 4d 85 ed <41> 0f b7 5e 10 74 2d 4d 85 e4 74 28 e8 98 79 ee ff 49 39 dd 48 RIP [<ffffffff811b99f7>] user_read+0x4f/0x8f RSP <ffff88003bf47f08> CR2: 0000000000000010 Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Jeff Layton <jlayton@redhat.com> cc: Wang Lei <wang840925@gmail.com> Signed-off-by: James Morris <jmorris@namei.org>
2011-02-28net: update Documentation/networking/00-INDEXRandy Dunlap1-6/+0
Clean up entries in 00-INDEX: drop files that have been removed. Reported-by: Rob Landley <rlandley@parallels.com> Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Acked-by: Rob Landley <rlandley@parallels.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-02-20tcp: document tcp_max_ssthresh (Limited Slow-Start)Ilpo Järvinen1-0/+11
Base on Ilpo's patch about documenting tcp_max_ssthresh. (see http://marc.info/?l=linux-netdev&m=117950581307310&w=2) According to errata of RFC3742, fix the number of segments increased during RTT time. Just to state the occasion to use this parameter, But about how to set parameter value, maybe some others can do it. Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi> Signed-off-by: Shan Wei <shanwei@cn.fujitsu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-02-19Merge branch 'master' of ↵David S. Miller1-0/+2
master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 Conflicts: Documentation/feature-removal-schedule.txt drivers/net/e1000e/netdev.c net/xfrm/xfrm_policy.c
2011-02-10net: fix ifenslave build flagsRandy Dunlap1-0/+2
-I (include path) should be specified for host builds. This one was overlooked somehow. Fixes https://bugzilla.kernel.org/show_bug.cgi?id=25902 Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Reported-by: Alexey Salmin <alexey.salmin@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-02-04Merge branch 'master' of ↵David S. Miller1-1/+1
master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
2011-02-02tcp_ecn is an integer not a booleanPeter Chubb1-1/+1
There was some confusion at LCA as to why the sysctl tcp_ecn took one of three values when it was documented as a Boolean. This patch fixes the documentation. Signed-off-by: Peter Chubb <peter.chubb@nicta.com.au> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-01-31Merge branch 'batman-adv/next' of git://git.open-mesh.org/ecsv/linux-mergeDavid S. Miller1-8/+8
2011-01-31batman-adv: Merge README of v2011.0.0 releaseSven Eckelmann1-8/+8
Signed-off-by: Sven Eckelmann <sven@narfation.org>
2011-01-25bonding: update documentation - alternate configuration.Nicolas de Pesloüan1-12/+71
The bonding documentation used to provide configuration details and examples for initscripts and sysconfig only. This patch describe the third possible configuration: /etc/network/interfaces. Signed-off-by: Nicolas de Pesloüan <nicolas.2p.debian@free.fr> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-01-13Merge branch 'for-next' of ↵Linus Torvalds4-6/+6
git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial * 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (43 commits) Documentation/trace/events.txt: Remove obsolete sched_signal_send. writeback: fix global_dirty_limits comment runtime -> real-time ppc: fix comment typo singal -> signal drivers: fix comment typo diable -> disable. m68k: fix comment typo diable -> disable. wireless: comment typo fix diable -> disable. media: comment typo fix diable -> disable. remove doc for obsolete dynamic-printk kernel-parameter remove extraneous 'is' from Documentation/iostats.txt Fix spelling milisec -> ms in snd_ps3 module parameter description Fix spelling mistakes in comments Revert conflicting V4L changes i7core_edac: fix typos in comments mm/rmap.c: fix comment sound, ca0106: Fix assignment to 'channel'. hrtimer: fix a typo in comment init/Kconfig: fix typo anon_inodes: fix wrong function name in comment fix comment typos concerning "consistent" poll: fix a typo in comment ... Fix up trivial conflicts in: - drivers/net/wireless/iwlwifi/iwl-core.c (moved to iwl-legacy.c) - fs/ext4/ext4.h Also fix missed 'diabled' typo in drivers/net/bnx2x/bnx2x.h while at it.
2011-01-07dccp: make upper bound for seq_window consistent on 32/64 bitGerrit Renker1-0/+1
The 'seq_window' sysctl sets the initial value for the DCCP Sequence Window, which may range from 32..2^46-1 (RFC 4340, 7.5.2). The patch sets the upper bound consistently to 2^32-1 on both 32 and 64 bit systems, which should be sufficient - with a RTT of 1sec and 1-byte packets, a seq_window of 2^32-1 corresponds to a link speed of 34 Gbps. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>

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