Merge 4.7-rc6 into tty-next

We want the tty/serial fixes in here as well.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Merge 4.7-rc6 into staging-next

We want the staging fixes in here as well.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Merge branch 'irq/for-block' into irq/core

Pull the irq affinity managing code which is in a seperate branch for block
developers to pull.

Merge branch 'rds-multipath-datastructures'

Sowmini Varadhan says:

====================
RDS:TCP data structure changes for multipath support

The second installment of changes to enable multipath s

Merge branch 'rds-multipath-datastructures'

Sowmini Varadhan says:

====================
RDS:TCP data structure changes for multipath support

The second installment of changes to enable multipath support in
RDS-TCP. This series implements the changes in rds-tcp so that the
rds_conn_path has a pointer to the rds_tcp_connection in cp_transport_data.
Struct rds_tcp_connection keeps track of the inet_sk per path in
t_sock. The ->sk_user_data in turn is a pointer to the rds_conn_path.
With this set of changes, rds_tcp has the needed plumbing to handle
multiple paths(socket) per rds_connection.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

show more ...

RDS: TCP: make receive path use the rds_conn_path

The ->sk_user_data contains a pointer to the rds_conn_path
for the socket. Use this consistently in the rds_tcp_data_ready
callbacks to get the rds_

RDS: TCP: make receive path use the rds_conn_path

The ->sk_user_data contains a pointer to the rds_conn_path
for the socket. Use this consistently in the rds_tcp_data_ready
callbacks to get the rds_conn_path for rds_recv_incoming.

Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

show more ...

RDS: TCP: make ->sk_user_data point to a rds_conn_path

The socket callbacks should all operate on a struct rds_conn_path,
in preparation for a MP capable RDS-TCP.

Acked-by: Santosh Shilimkar <santo

RDS: TCP: make ->sk_user_data point to a rds_conn_path

The socket callbacks should all operate on a struct rds_conn_path,
in preparation for a MP capable RDS-TCP.

Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

show more ...

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net

Several cases of overlapping changes, except the packet scheduler
conflicts which deal with the addition of the free list parameter
to q

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net

Several cases of overlapping changes, except the packet scheduler
conflicts which deal with the addition of the free list parameter
to qdisc_enqueue().

Signed-off-by: David S. Miller <davem@davemloft.net>

show more ...

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net

Pull networking fixes from David Miller:
"I've been traveling so this accumulates more than week or so of bug
fixing. It perhaps loo

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net

Pull networking fixes from David Miller:
"I've been traveling so this accumulates more than week or so of bug
fixing. It perhaps looks a little worse than it really is.

1) Fix deadlock in ath10k driver, from Ben Greear.

2) Increase scan timeout in iwlwifi, from Luca Coelho.

3) Unbreak STP by properly reinjecting STP packets back into the
stack. Regression fix from Ido Schimmel.

4) Mediatek driver fixes (missing malloc failure checks, leaking of
scratch memory, wrong indexing when mapping TX buffers, etc.) from
John Crispin.

5) Fix endianness bug in icmpv6_err() handler, from Hannes Frederic
Sowa.

6) Fix hashing of flows in UDP in the ruseport case, from Xuemin Su.

7) Fix netlink notifications in ovs for tunnels, delete link messages
are never emitted because of how the device registry state is
handled. From Nicolas Dichtel.

8) Conntrack module leaks kmemcache on unload, from Florian Westphal.

9) Prevent endless jump loops in nft rules, from Liping Zhang and
Pablo Neira Ayuso.

10) Not early enough spinlock initialization in mlx4, from Eric
Dumazet.

11) Bind refcount leak in act_ipt, from Cong WANG.

12) Missing RCU locking in HTB scheduler, from Florian Westphal.

13) Several small MACSEC bug fixes from Sabrina Dubroca (missing RCU
barrier, using heap for SG and IV, and erroneous use of async flag
when allocating AEAD conext.)

14) RCU handling fix in TIPC, from Ying Xue.

15) Pass correct protocol down into ipv4_{update_pmtu,redirect}() in
SIT driver, from Simon Horman.

16) Socket timer deadlock fix in TIPC from Jon Paul Maloy.

17) Fix potential deadlock in team enslave, from Ido Schimmel.

18) Memory leak in KCM procfs handling, from Jiri Slaby.

19) ESN generation fix in ipv4 ESP, from Herbert Xu.

20) Fix GFP_KERNEL allocations with locks held in act_ife, from Cong
WANG.

21) Use after free in netem, from Eric Dumazet.

22) Uninitialized last assert time in multicast router code, from Tom
Goff.

23) Skip raw sockets in sock_diag destruction broadcast, from Willem
de Bruijn.

24) Fix link status reporting in thunderx, from Sunil Goutham.

25) Limit resegmentation of retransmit queue so that we do not
retransmit too large GSO frames. From Eric Dumazet.

26) Delay bpf program release after grace period, from Daniel
Borkmann"

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (141 commits)
openvswitch: fix conntrack netlink event delivery
qed: Protect the doorbell BAR with the write barriers.
neigh: Explicitly declare RCU-bh read side critical section in neigh_xmit()
e1000e: keep VLAN interfaces functional after rxvlan off
cfg80211: fix proto in ieee80211_data_to_8023 for frames without LLC header
qlcnic: use the correct ring in qlcnic_83xx_process_rcv_ring_diag()
bpf, perf: delay release of BPF prog after grace period
net: bridge: fix vlan stats continue counter
tcp: do not send too big packets at retransmit time
ibmvnic: fix to use list_for_each_safe() when delete items
net: thunderx: Fix TL4 configuration for secondary Qsets
net: thunderx: Fix link status reporting
net/mlx5e: Reorganize ethtool statistics
net/mlx5e: Fix number of PFC counters reported to ethtool
net/mlx5e: Prevent adding the same vxlan port
net/mlx5e: Check for BlueFlame capability before allocating SQ uar
net/mlx5e: Change enum to better reflect usage
net/mlx5: Add ConnectX-5 PCIe 4.0 to list of supported devices
net/mlx5: Update command strings
net: marvell: Add separate config ANEG function for Marvell 88E1111
...

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net: rds: fix coding style issues

Fix coding style issues in the following files:

ib_cm.c: add space
loop.c: convert spaces to tabs
sysctl.c: add space
tcp.h: convert spaces t

net: rds: fix coding style issues

Fix coding style issues in the following files:

ib_cm.c: add space
loop.c: convert spaces to tabs
sysctl.c: add space
tcp.h: convert spaces to tabs
tcp_connect.c:remove extra indentation in switch statement
tcp_recv.c: convert spaces to tabs
tcp_send.c: convert spaces to tabs
transport.c: move brace up one line on for statement

Signed-off-by: Joshua Houghton <josh@awful.name>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

show more ...

Merge branches 'pm-opp' and 'pm-cpufreq-fixes'

* pm-opp:
PM / OPP: Add 'UNKNOWN' status for shared_opp in struct opp_table

* pm-cpufreq-fixes:
cpufreq: intel_pstate: Adjust _PSS[0] freqeuency i

Merge branches 'pm-opp' and 'pm-cpufreq-fixes'

* pm-opp:
PM / OPP: Add 'UNKNOWN' status for shared_opp in struct opp_table

* pm-cpufreq-fixes:
cpufreq: intel_pstate: Adjust _PSS[0] freqeuency if needed

show more ...

Merge branch 'rds-mprds-foundations'

Sowmini Varadhan says:

====================
RDS: multiple connection paths for scaling

Today RDS-over-TCP is implemented by demux-ing multiple PF_RDS sockets
b

Merge branch 'rds-mprds-foundations'

Sowmini Varadhan says:

====================
RDS: multiple connection paths for scaling

Today RDS-over-TCP is implemented by demux-ing multiple PF_RDS sockets
between any 2 endpoints (where endpoint == [IP address, port]) over a
single TCP socket between the 2 IP addresses involved. This has the
limitation that it ends up funneling multiple RDS flows over a single
TCP flow, thus the rds/tcp connection is
(a) upper-bounded to the single-flow bandwidth,
(b) suffers from head-of-line blocking for the RDS sockets.

Better throughput (for a fixed small packet size, MTU) can be achieved
by having multiple TCP/IP flows per rds/tcp connection, i.e., multipathed
RDS (mprds). Each such TCP/IP flow constitutes a path for the rds/tcp
connection. RDS sockets will be attached to a path based on some hash
(e.g., of local address and RDS port number) and packets for that RDS
socket will be sent over the attached path using TCP to segment/reassemble
RDS datagrams on that path.

The table below, generated using a prototype that implements mprds,
shows that this is significant for scaling to 40G. Packet sizes
used were: 8K byte req, 256 byte resp. MTU: 1500. The parameters for
RDS-concurrency used below are described in the rds-stress(1) man page-
the number listed is proportional to the number of threads at which max
throughput was attained.

-------------------------------------------------------------------
RDS-concurrency Num of tx+rx K/s (iops) throughput
(-t N -d N) TCP paths
-------------------------------------------------------------------
16 1 600K - 700K 4 Gbps
28 8 5000K - 6000K 32 Gbps
-------------------------------------------------------------------

FAQ: what is the relation between mprds and mptcp?
mprds is orthogonal to mptcp. Whereas mptcp creates
sub-flows for a single TCP connection, mprds parallelizes tx/rx
at the RDS layer. MPRDS with N paths will allow N datagrams to
be sent in parallel; each path will continue to send one
datagram at a time, with sender and receiver keeping track of
the retransmit and dgram-assembly state based on the RDS header.
If desired, mptcp can additionally be used to speed up each TCP
path. That acceleration is orthogonal to the parallelization benefits
of mprds.

This patch series lays down the foundational data-structures to support
mprds in the kernel. It implements the changes to split up the
rds_connection structure into a common (to all paths) part,
and a per-path rds_conn_path. All I/O workqs are driven from
the rds_conn_path.

Note that this patchset does not (yet) actually enable multipathing
for any of the transports; all transports will continue to use a
single path with the refactored data-structures. A subsequent patchset
will add the changes to the rds-tcp module to actually use mprds
in rds-tcp.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

show more ...

RDS: split out connection specific state from rds_connection to rds_conn_path

In preparation for multipath RDS, split the rds_connection
structure into a base structure, and a per-path struct rds_co

RDS: split out connection specific state from rds_connection to rds_conn_path

In preparation for multipath RDS, split the rds_connection
structure into a base structure, and a per-path struct rds_conn_path.
The base structure tracks information and locks common to all
paths. The workqs for send/recv/shutdown etc are tracked per
rds_conn_path. Thus the workq callbacks now work with rds_conn_path.

This commit allows for one rds_conn_path per rds_connection, and will
be extended into multiple conn_paths in subsequent commits.

Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Merge branch 'x86/urgent' into x86/cpu, to pick up dependency

Signed-off-by: Ingo Molnar <mingo@kernel.org>

Merge branch 'linus' into perf/core, to refresh the branch

Signed-off-by: Ingo Molnar <mingo@kernel.org>

Merge tag 'v4.7-rc2' into v4l_for_linus

Linux 4.7-rc2

* tag 'v4.7-rc2': (10914 commits)
Linux 4.7-rc2
devpts: Make each mount of devpts an independent filesystem.
parisc: Move die_if_kernel()

Merge tag 'v4.7-rc2' into v4l_for_linus

Linux 4.7-rc2

* tag 'v4.7-rc2': (10914 commits)
Linux 4.7-rc2
devpts: Make each mount of devpts an independent filesystem.
parisc: Move die_if_kernel() prototype into traps.h header
parisc: Fix pagefault crash in unaligned __get_user() call
parisc: Fix printk time during boot
parisc: Fix backtrace on PA-RISC
mm, page_alloc: recalculate the preferred zoneref if the context can ignore memory policies
mm, page_alloc: reset zonelist iterator after resetting fair zone allocation policy
mm, oom_reaper: do not use siglock in try_oom_reaper()
mm, page_alloc: prevent infinite loop in buffered_rmqueue()
checkpatch: reduce git commit description style false positives
mm/z3fold.c: avoid modifying HEADLESS page and minor cleanup
memcg: add RCU locking around css_for_each_descendant_pre() in memcg_offline_kmem()
mm: check the return value of lookup_page_ext for all call sites
kdump: fix dmesg gdbmacro to work with record based printk
mm: fix overflow in vm_map_ram()
Btrfs: deal with duplciates during extent_map insertion in btrfs_get_extent
arm64: fix alignment when RANDOMIZE_TEXT_OFFSET is enabled
arm64: move {PAGE,CONT}_SHIFT into Kconfig
arm64: mm: dump: log span level
...

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Merge branches 'acpica-fixes', 'acpi-video' and 'acpi-processor'

* acpica-fixes:
ACPICA / Hardware: Fix old register check in acpi_hw_get_access_bit_width()

* acpi-video:
ACPI / Thermal / video

Merge branches 'acpica-fixes', 'acpi-video' and 'acpi-processor'

* acpica-fixes:
ACPICA / Hardware: Fix old register check in acpi_hw_get_access_bit_width()

* acpi-video:
ACPI / Thermal / video: fix max_level incorrect value

* acpi-processor:
ACPI / processor: Avoid reserving IO regions too early

show more ...

Merge tag 'irqchip-4.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms into irq/urgent

Merge irqchip updates from Marc Zyngier:

- A number of embarassing buglets (GICv3, PIC

Merge tag 'irqchip-4.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms into irq/urgent

Merge irqchip updates from Marc Zyngier:

- A number of embarassing buglets (GICv3, PIC32)
- A more substential errata workaround for Cavium's GICv3 ITS
(kept for post-rc1 due to its dependency on NUMA)

show more ...

Merge remote-tracking branch 'airlied/drm-next' into drm-intel-next-queued

Git got absolutely destroyed with all our cherry-picking from
drm-intel-next-queued to various branches. It ended up insert

Merge remote-tracking branch 'airlied/drm-next' into drm-intel-next-queued

Git got absolutely destroyed with all our cherry-picking from
drm-intel-next-queued to various branches. It ended up inserting
intel_crtc_page_flip 2x even in intel_display.c.

Backmerge to get back to sanity.

Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>

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Merge tag 'v4.7-rc1' into patchwork

Linux 4.7-rc1

* tag 'v4.7-rc1': (10534 commits)
Linux 4.7-rc1
hash_string: Fix zero-length case for !DCACHE_WORD_ACCESS
Rename other copy of hash_string to

Merge tag 'v4.7-rc1' into patchwork

Linux 4.7-rc1

* tag 'v4.7-rc1': (10534 commits)
Linux 4.7-rc1
hash_string: Fix zero-length case for !DCACHE_WORD_ACCESS
Rename other copy of hash_string to hashlen_string
hpfs: implement the show_options method
affs: fix remount failure when there are no options changed
hpfs: fix remount failure when there are no options changed
fs: fix binfmt_aout.c build error
h8300: Add <asm/hash.h>
microblaze: Add <asm/hash.h>
m68k: Add <asm/hash.h>
<linux/hash.h>: Add support for architecture-specific functions
fs/namei.c: Improve dcache hash function
Eliminate bad hash multipliers from hash_32() and hash_64()
Change hash_64() return value to 32 bits
<linux/sunrpc/svcauth.h>: Define hash_str() in terms of hashlen_string()
fs/namei.c: Add hashlen_string() function
Pull out string hash to <linux/stringhash.h>
Revert "platform/chrome: chromeos_laptop: Add Leon Touch"
i2c: dev: use after free in detach
MIPS: Add missing FROZEN hotplug notifier transitions
...

show more ...

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net

Pull networking fixes and more updates from David Miller:

1) Tunneling fixes from Tom Herbert and Alexander Duyck.

2) AF_UNIX update

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net

Pull networking fixes and more updates from David Miller:

1) Tunneling fixes from Tom Herbert and Alexander Duyck.

2) AF_UNIX updates some struct sock bit fields with the socket lock,
whereas setsockopt() sets overlapping ones with locking. Seperate
out the synchronized vs. the AF_UNIX unsynchronized ones to avoid
corruption. From Andrey Ryabinin.

3) Mount BPF filesystem with mount_nodev rather than mount_ns, from
Eric Biederman.

4) A couple kmemdup conversions, from Muhammad Falak R Wani.

5) BPF verifier fixes from Alexei Starovoitov.

6) Don't let tunneled UDP packets get stuck in socket queues, if
something goes wrong during the encapsulation just drop the packet
rather than signalling an error up the call stack. From Hannes
Frederic Sowa.

7) SKB ref after free in batman-adv, from Florian Westphal.

8) TCP iSCSI, ocfs2, rds, and tipc have to disable BH in it's TCP
callbacks since the TCP stack runs pre-emptibly now. From Eric
Dumazet.

9) Fix crash in fixed_phy_add, from Rabin Vincent.

10) Fix length checks in xen-netback, from Paul Durrant.

11) Fix mixup in KEY vs KEYID macsec attributes, from Sabrina Dubroca.

12) RDS connection spamming bug fixes from Sowmini Varadhan

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (152 commits)
net: suppress warnings on dev_alloc_skb
uapi glibc compat: fix compilation when !__USE_MISC in glibc
udp: prevent skbs lingering in tunnel socket queues
bpf: teach verifier to recognize imm += ptr pattern
bpf: support decreasing order in direct packet access
net: usb: ch9200: use kmemdup
ps3_gelic: use kmemdup
net:liquidio: use kmemdup
bpf: Use mount_nodev not mount_ns to mount the bpf filesystem
net: cdc_ncm: update datagram size after changing mtu
tuntap: correctly wake up process during uninit
intel: Add support for IPv6 IP-in-IP offload
ip6_gre: Do not allow segmentation offloads GRE_CSUM is enabled with FOU/GUE
RDS: TCP: Avoid rds connection churn from rogue SYNs
RDS: TCP: rds_tcp_accept_worker() must exit gracefully when terminating rds-tcp
net: sock: move ->sk_shutdown out of bitfields.
ipv6: Don't reset inner headers in ip6_tnl_xmit
ip4ip6: Support for GSO/GRO
ip6ip6: Support for GSO/GRO
ipv6: Set features for IPv6 tunnels
...

show more ...

Merge branch 'tcp_bh_fixes'

Eric Dumazet says:

====================
net: block BH in TCP callbacks

Four layers using TCP stack were assuming sk_callback_lock could
be locked using read_lock() in t

Merge branch 'tcp_bh_fixes'

Eric Dumazet says:

====================
net: block BH in TCP callbacks

Four layers using TCP stack were assuming sk_callback_lock could
be locked using read_lock() in their handlers because TCP stack
was running with BH disabled.

This is no longer the case. Since presumably the rest could
also depend on BH being disabled, just use read_lock_bh().

Then each layer might consider switching to RCU protection
and no longer depend on BH.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

show more ...

rds: tcp: block BH in TCP callbacks

TCP stack can now run from process context.

Use read_lock_bh(&sk->sk_callback_lock) variant to restore previous
assumption.

Fixes: 5413d1babe8f ("net: do not bl

rds: tcp: block BH in TCP callbacks

TCP stack can now run from process context.

Use read_lock_bh(&sk->sk_callback_lock) variant to restore previous
assumption.

Fixes: 5413d1babe8f ("net: do not block BH while processing socket backlog")
Fixes: d41a69f1d390 ("tcp: make tcp_sendmsg() aware of socket backlog")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

show more ...

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next

Pull networking updates from David Miller:
"Highlights:

1) Support SPI based w5100 devices, from Akinobu Mita.

2) Partial

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next

Pull networking updates from David Miller:
"Highlights:

1) Support SPI based w5100 devices, from Akinobu Mita.

2) Partial Segmentation Offload, from Alexander Duyck.

3) Add GMAC4 support to stmmac driver, from Alexandre TORGUE.

4) Allow cls_flower stats offload, from Amir Vadai.

5) Implement bpf blinding, from Daniel Borkmann.

6) Optimize _ASYNC_ bit twiddling on sockets, unless the socket is
actually using FASYNC these atomics are superfluous. From Eric
Dumazet.

7) Run TCP more preemptibly, also from Eric Dumazet.

8) Support LED blinking, EEPROM dumps, and rxvlan offloading in mlx5e
driver, from Gal Pressman.

9) Allow creating ppp devices via rtnetlink, from Guillaume Nault.

10) Improve BPF usage documentation, from Jesper Dangaard Brouer.

11) Support tunneling offloads in qed, from Manish Chopra.

12) aRFS offloading in mlx5e, from Maor Gottlieb.

13) Add RFS and RPS support to SCTP protocol, from Marcelo Ricardo
Leitner.

14) Add MSG_EOR support to TCP, this allows controlling packet
coalescing on application record boundaries for more accurate
socket timestamp sampling. From Martin KaFai Lau.

15) Fix alignment of 64-bit netlink attributes across the board, from
Nicolas Dichtel.

16) Per-vlan stats in bridging, from Nikolay Aleksandrov.

17) Several conversions of drivers to ethtool ksettings, from Philippe
Reynes.

18) Checksum neutral ILA in ipv6, from Tom Herbert.

19) Factorize all of the various marvell dsa drivers into one, from
Vivien Didelot

20) Add VF support to qed driver, from Yuval Mintz"

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (1649 commits)
Revert "phy dp83867: Fix compilation with CONFIG_OF_MDIO=m"
Revert "phy dp83867: Make rgmii parameters optional"
r8169: default to 64-bit DMA on recent PCIe chips
phy dp83867: Make rgmii parameters optional
phy dp83867: Fix compilation with CONFIG_OF_MDIO=m
bpf: arm64: remove callee-save registers use for tmp registers
asix: Fix offset calculation in asix_rx_fixup() causing slow transmissions
switchdev: pass pointer to fib_info instead of copy
net_sched: close another race condition in tcf_mirred_release()
tipc: fix nametable publication field in nl compat
drivers: net: Don't print unpopulated net_device name
qed: add support for dcbx.
ravb: Add missing free_irq() calls to ravb_close()
qed: Remove a stray tab
net: ethernet: fec-mpc52xx: use phy_ethtool_{get|set}_link_ksettings
net: ethernet: fec-mpc52xx: use phydev from struct net_device
bpf, doc: fix typo on bpf_asm descriptions
stmmac: hardware TX COE doesn't work when force_thresh_dma_mode is set
net: ethernet: fs-enet: use phy_ethtool_{get|set}_link_ksettings
net: ethernet: fs-enet: use phydev from struct net_device
...

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Merge branch 'pskb_extract'

Sowmini Varadhan says:

====================
pskb_extract() helper function.

This patchset follows up on the discussion in
https://www.mail-archive.com/netdev@vger.kern

Merge branch 'pskb_extract'

Sowmini Varadhan says:

====================
pskb_extract() helper function.

This patchset follows up on the discussion in
https://www.mail-archive.com/netdev@vger.kernel.org/msg105090.html

For RDS-TCP, we have to deal with the full gamut of
nonlinear sk_buffs, including all the frag_list variants.
Also, the parent skb has to remain unchanged, while the clone
is queued for Rx on the PF_RDS socket.

Patch 1 of this patchset adds a pskb_extract() function that
does all this without the redundant memcpy's in pskb_expand_head()
and __pskb_pull_tail().

v2: Marcelo Leitner review comments
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

show more ...

RDS: TCP: Call pskb_extract() helper function

rds-stress experiments with request size 256 bytes, 8K acks,
using 16 threads show a 40% improvment when pskb_extract()
replaces the {skb_clone(..); psk

RDS: TCP: Call pskb_extract() helper function

rds-stress experiments with request size 256 bytes, 8K acks,
using 16 threads show a 40% improvment when pskb_extract()
replaces the {skb_clone(..); pskb_pull(..); pskb_trim(..);}
pattern in the Rx path, so we leverage the perf gain with
this commit.

Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

show more ...