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syzbot reported a scheduling while atomic issue at netns
destruction time:
BUG: sleeping function called from invalid context at net/core/sock.c:2769
in_atomic(): 1, irqs_disabled(): 0, pid: 85, name: kworker/u4:3
5 locks held by kworker/u4:3/85:
#0: ((wq_completion)"%s""netns"){+.+.}, at: [<00000000c9792deb>]
process_one_work+0xaaf/0x1af0 kernel/workqueue.c:2084
#1: (net_cleanup_work){+.+.}, at: [<00000000adc12e2a>]
process_one_work+0xb01/0x1af0 kernel/workqueue.c:2088
#2: (net_sem){++++}, at: [<000000009ccb5669>] cleanup_net+0x23f/0xd20
net/core/net_namespace.c:494
#3: (net_mutex){+.+.}, at: [<00000000a92767d9>] cleanup_net+0xa7d/0xd20
net/core/net_namespace.c:496
#4: (&(&srv->idr_lock)->rlock){+...}, at: [<000000001343e568>]
spin_lock_bh include/linux/spinlock.h:315 [inline]
#4: (&(&srv->idr_lock)->rlock){+...}, at: [<000000001343e568>]
tipc_topsrv_stop+0x231/0x610 net/tipc/topsrv.c:685
CPU: 0 PID: 85 Comm: kworker/u4:3 Not tainted 4.16.0-rc1+ #230
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Workqueue: netns cleanup_net
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x194/0x257 lib/dump_stack.c:53
___might_sleep+0x2b2/0x470 kernel/sched/core.c:6128
__might_sleep+0x95/0x190 kernel/sched/core.c:6081
lock_sock_nested+0x37/0x110 net/core/sock.c:2769
lock_sock include/net/sock.h:1463 [inline]
tipc_release+0x103/0xff0 net/tipc/socket.c:572
sock_release+0x8d/0x1e0 net/socket.c:594
tipc_topsrv_stop+0x3c0/0x610 net/tipc/topsrv.c:696
tipc_exit_net+0x15/0x40 net/tipc/core.c:96
ops_exit_list.isra.6+0xae/0x150 net/core/net_namespace.c:148
cleanup_net+0x6ba/0xd20 net/core/net_namespace.c:529
process_one_work+0xbbf/0x1af0 kernel/workqueue.c:2113
worker_thread+0x223/0x1990 kernel/workqueue.c:2247
kthread+0x33c/0x400 kernel/kthread.c:238
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:429
This is caused by tipc_topsrv_stop() releasing the listener socket
with the idr lock held. This changeset addresses the issue moving
the release operation outside such lock.
Reported-and-tested-by: syzbot+749d9d87c294c00ca856@syzkaller.appspotmail.com
Fixes: 0ef897be12b8 ("tipc: separate topology server listener socket from subcsriber sockets")
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Acked-by: ///jon
Signed-off-by: David S. Miller <davem@davemloft.net>
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In commit cc1ea9ffadf7 ("tipc: eliminate struct tipc_subscriber") we
re-introduced an old bug on the error path in the function
tipc_topsrv_kern_subscr(). We now re-introduce the correction too.
Reported-by: syzbot+f62e0f2a0ef578703946@syzkaller.appspotmail.com
Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Kirill Tkhai says:
====================
Converting pernet_operations (part #2)
This patchset continues to review and to convert pernet_operations
to async. There are mostly ipv6, also some regular used netfilter
pernet_operations are involved. One more converted is cfg80211_pernet_ops.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
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These pernet_operations register and unregister
net::ipv4.iptable_filter table. Since there are
no packets in-flight at the time of exit method
is working, iptables rules should not be touched.
Also, pernet_operations should not send ipv4
packets each other. So, it's safe to mark them
async.
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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ip_tables_net_ops and udplite6_net_ops create and destroy /proc entries.
xt_net_ops does nothing.
So, we are able to mark them async.
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Exit methods calls inet_frags_exit_net() with global ip6_frags
as argument. So, after we make the pernet_operations async,
a pair of exit methods may be called to iterate this hash table.
Since there is inet_frag_worker(), which already may work
in parallel with inet_frags_exit_net(), and it can make the same
cleanup, that inet_frags_exit_net() does, it's safe. So we may
mark these pernet_operations as async.
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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These pernet_operations register and unregister tables
and lists for packets forwarding. All of the entities
are per-net. Init methods makes simple initializations,
and since net is not visible for foreigners at the time
it is working, it can't race with anything. Exit method
is executed when there are only local devices, and there
mustn't be packets in-flight. Also, it looks like no one
pernet_operations want to send ipv6 packets to foreign
net. The same reasons are for ipv6_addr_label_ops and
ip6_segments_ops. So, we are able to mark all them as
async.
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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These pernet_operations create sysctl tables and
initialize net::xfrm.xfrm6_dst_ops used for routing.
It doesn't look like another pernet_operations send
ipv6 packets to foreign net namespaces, so it should
be safe to mark the pernet_operations as async.
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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These pernet_operations create and destroy /proc entries.
ip6_fl_purge() makes almost the same actions as timer
ip6_fl_gc_timer does, and as it can be executed in parallel
with ip6_fl_purge(), two parallel ip6_fl_purge() may be
executed. So, we can mark it async.
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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These pernet_operations only register and unregister /proc
entries, so it's possible to mark them async.
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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These pernet_operations create and destroy sysctl tables.
They are not touched by another net pernet_operations.
So, it's possible to execute them in parallel with others.
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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These pernet_operations create and destroy net::ipv6.tcp_sk
socket, which is used in tcp_v6_send_response() only. It looks
like foreign pernet_operations don't want to set ipv6 connection
inside destroyed net, so this socket may be created in destroyed
in parallel with anything else. inet_twsk_purge() is also safe
for that, as described in patch for tcp_sk_ops. So, it's possible
to mark them as async.
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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These pernet_operations register and unregister
net::ipv6.fib6_rules_ops, which are used for
routing. It looks like there are no pernet_operations,
which send ipv6 packages to another net, so we
are able to mark them as async.
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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net->ipv6.peers is dereferenced in three places via inet_getpeer_v6(),
and it's used to handle skb. All the users of inet_getpeer_v6() do not
look like be able to be called from foreign net pernet_operations, so
we may mark them as async.
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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and ip6_route_net_late_ops
These pernet_operations create and destroy /proc entries
and safely may be converted and safely may be mark as async.
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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These pernet_operations create and destroy net::ipv6.icmp_sk
socket, used to send ICMP or error reply.
Nobody can dereference the socket to handle a packet before
net is initialized, as there is no routing; nobody can do
that in parallel with exit, as all of devices are moved
to init_net or destroyed and there are no packets it-flight.
So, it's possible to mark these pernet_operations as async.
The same for ndisc_net_ops and for igmp6_net_ops. The last
one also creates and destroys /proc entries.
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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These pernet_operations create and destroy /proc entries,
populate and depopulate net::rules_ops and multiroute table.
All the structures are pernet, and they are not touched
by foreign net pernet_operations. So, it's possible to mark
them async.
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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This patch finishes converting pernet_operations
registered in net/wireless directory.
These pernet_operations have only exit method,
which moves devices to init_net. This action
is not pernet_operations-specific, and function
cfg80211_switch_netns() may be called all time
during the system life. All necessary protection
against concurrent cfg80211_pernet_exit() is made
by rtnl_lock(). So, cfg80211_pernet_ops is able
to be marked as async.
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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init method initializes sysctl defaults, allocates
percpu arrays and creates /proc entries.
exit method reverts the above.
There are no pernet_operations, which are interested
in the above entities of foreign net namespace, so
inet6_net_ops are able to be marked as async.
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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The ADVERTISED_Asym_Pause bit was being improperly set when both
rx and tx pause were enabled. When rx and tx are both enabled, only
the ADVERTISED_Pause bit is supposed to be set.
Signed-off-by: Jake Moroni <mail@jakemoroni.com>
Acked-by: Madalin Bucur <madalin.bucur@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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The *while* loop in this function can be turned into a normal *for* loop.
And getting rid of the single return point saves us a few more LoCs...
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Martin Blumenstingl says:
====================
dwmac-meson8b: small cleanup
This is a follow-up to my previous series "dwmac-meson8b: clock fixes for
Meson8b" from [0].
during the review of that series it was found that the clock registration
could be simplified. now that the previous series has landed we can start
cleaning up the clock registration.
the goal of this series is to simplify the code in the dwmac-meson8b
driver. no functional changes are intended.
I have tested this on my Khadas VIM2 (GXM SoC, with RGMII PHY) and my
Endless Mini (EC-100, Meson8b SoC with RMII PHY, .dts support is not part
of mainline yet). no problems were found.
[0] http://lists.infradead.org/pipermail/linux-amlogic/2018-January/006143.html
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
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The common clock framework needs access to the "clock configuration"
structs during runtime.
However, only the common clock framework should access these. Ensure
this by moving the configuration structs out of struct meson8b_dwmac,
so only meson8b_init_rgmii_tx_clk() and the common clock framework know
about these configurations.
Suggested-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Acked-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Nothing in the dwmac-meson8b driver (except .probe itself) requires the
platform_device anymore after .probe has finished. Replace it with a
pointer to struct device since this is what the functions inside the
driver are actually accessing.
No functional changes.
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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To goal of this patch is to simplify the registration of the RGMII TX
clock (and it's parent clocks). This is achieved by:
- introducing the meson8b_dwmac_register_clk helper-function to remove
code duplication when registering a single clock (this saves a few
lines since we have 4 clocks internally)
- using devm_add_action_or_reset to disable the RGMII TX clock
automatically when needed. This also allows us to re-use the standard
stmmac_pltfr_remove function.
- devm_kasprintf() and devm_kstrdup() are not used anymore to generate
the clock name (these are replaced by a variable on the stack) because
the common clock framework already uses kstrdup() internally.
No functional changes intended.
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Reviewed-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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_port_ is already known to be a valid index in the callers [1]. So
these checks are unnecessary.
[1] https://lkml.org/lkml/2018/2/16/469
Addresses-Coverity-ID: 1465287
Addresses-Coverity-ID: 1465291
Suggested-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Because READ_ONCE() now implies smp_read_barrier_depends(), the
smp_read_barrier_depends() in __ptr_ring_consume() is redundant;
this commit removes it and updates the comments.
Signed-off-by: Andrea Parri <parri.andrea@gmail.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Jason Wang <jasowang@redhat.com>
Cc: John Fastabend <john.fastabend@gmail.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: <linux-kernel@vger.kernel.org>
Cc: <netdev@vger.kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Reviewed-by: Stefano Brivio <sbrivio@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Only allow ifindex from IP_PKTINFO to override SO_BINDTODEVICE settings
if the index is actually set in the message.
Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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The shifting of timehi by 16 bits to the left will be promoted to
a 32 bit signed int and then sign-extended to an u64. If the top bit
of timehi is set then all then all the upper bits of ns end up as also
being set because of the sign-extension. Fix this by making timehi and
timelo u64. Also move the declaration of ns.
Detected by CoverityScan, CID#1465288 ("Unintended sign extension")
Fixes: c6fe0ad2c349 ("net: dsa: mv88e6xxx: add rx/tx timestamping support")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Allow for changing the MTU within the limit of the maximum size of a
descriptor (2048 bytes). Add the callback to change MTU from user-space
and take the configurable MTU into account when configuring the
hardware.
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Jakub Kicinski says:
====================
nfp: whitespace sync and flower TCP flags
Whitespace cleanup from Michael and flower offload support for matching
on TCP flags from Pieter.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
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Implement tcp flag match offloading. Current tcp flag match support include
FIN, SYN, RST, PSH and URG flags, other flags are unsupported. The PSH and
URG flags are only set in the hardware fast path when used in combination
with the SYN, RST and PSH flags.
Signed-off-by: Pieter Jansen van Vuuren <pieter.jansenvanvuuren@netronome.com>
Reviewed-by: John Hurley <john.hurley@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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The nfp_net_ctrl.h file used spaces for indentation in the past but
tabs have crept in. Host driver files use tabs for indentation by
default, so let's convert to tabs for consistency across the file
and our drivers.
Signed-off-by: Michael Rapson <michael.rapson@netronome.com>
Acked-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Alexander Aring says:
====================
net: sched: act: add extack support
this patch series adds extack support for the TC action subsystem.
As example I for the extack support in a TC action I choosed mirred
action.
- Alex
Cc: David Ahern <dsahern@gmail.com>
changes since v3:
- adapt recommended changes from Davide Caratti, please check if
I catch everything. Thanks.
changes since v2:
- remove newline in extack of generic walker handling
Thanks to Davide Caratti
- add kernel@mojatatu.com in cc
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
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This patch adds extack support for TC mirred action.
Cc: David Ahern <dsahern@gmail.com>
Signed-off-by: Alexander Aring <aring@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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This patch adds extack handling for a common used TC act function
"tcf_generic_walker()" to add an extack message on failures.
The tcf_generic_walker() function can fail if get a invalid command
different than DEL and GET. The naming "action" here is wrong, the
correct naming would be command.
Cc: David Ahern <dsahern@gmail.com>
Signed-off-by: Alexander Aring <aring@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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This patch adds extack support for act walker callback api. This
prepares to handle extack support inside each specific act
implementation.
Cc: David Ahern <dsahern@gmail.com>
Signed-off-by: Alexander Aring <aring@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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This patch adds extack support for act lookup callback api. This
prepares to handle extack support inside each specific act
implementation.
Cc: David Ahern <dsahern@gmail.com>
Signed-off-by: Alexander Aring <aring@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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This patch adds extack support for act init callback api. This
prepares to handle extack support inside each specific act
implementation.
Based on work by David Ahern <dsahern@gmail.com>
Cc: David Ahern <dsahern@gmail.com>
Signed-off-by: Alexander Aring <aring@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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This patch adds extack support for generic act handling. The extack
will be set deeper to each called function which is not part of netdev
core api.
Based on work by David Ahern <dsahern@gmail.com>
Cc: David Ahern <dsahern@gmail.com>
Signed-off-by: Alexander Aring <aring@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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This patch adds extack to tcf_action_init and tcf_action_init_1
functions. These are necessary to make individual extack handling in
each act implementation.
Based on work by David Ahern <dsahern@gmail.com>
Cc: David Ahern <dsahern@gmail.com>
Signed-off-by: Alexander Aring <aring@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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This patch is used by subsequent patches. It fixes code style issues
caught by checkpatch.
Signed-off-by: Alexander Aring <aring@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Sowmini Varadhan says:
====================
RDS: zerocopy support
This is version 3 of the series, following up on review comments for
http://patchwork.ozlabs.org/project/netdev/list/?series=28530
Review comments addressed
Patch 4
- fix fragile use of skb->cb[], do not set ee_code incorrectly.
Patch 5:
- remove needless bzero of skb->cb[], consolidate err cleanup
A brief overview of this feature follows.
This patch series provides support for MSG_ZERCOCOPY
on a PF_RDS socket based on the APIs and infrastructure added
by Commit f214f915e7db ("tcp: enable MSG_ZEROCOPY")
For single threaded rds-stress testing using rds-tcp with the
ixgbe driver using 1M message sizes (-a 1M -q 1M) preliminary
results show that there is a significant reduction in latency: about
90 usec with zerocopy, compared with 200 usec without zerocopy.
This patchset modifies the above for zerocopy in the following manner.
- if the MSG_ZEROCOPY flag is specified with rds_sendmsg(), and,
- if the SO_ZEROCOPY socket option has been set on the PF_RDS socket,
application pages sent down with rds_sendmsg are pinned. The pinning
uses the accounting infrastructure added by a91dbff551a6 ("sock: ulimit
on MSG_ZEROCOPY pages"). The message is unpinned when all references
to the message go down to 0, and the message is freed by rds_message_purge.
A multithreaded application using this infrastructure must send down
a unique 32 bit cookie as ancillary data with each sendmsg invocation.
The format of this ancillary data is described in Patch 5 of the series.
The cookie is passed up to the application on the sk_error_queue when
the message is unpinned, indicating to the application that it is now
safe to free/reuse the message buffer. The details of the completion
notification are provided in Patch 4 of this series.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
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Send a cookie with sendmsg() on PF_RDS sockets, and process the
returned batched cookies in do_recv_completion()
Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Add support for basic PF_RDS client-server testing in msg_zerocopy
Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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If the MSG_ZEROCOPY flag is specified with rds_sendmsg(), and,
if the SO_ZEROCOPY socket option has been set on the PF_RDS socket,
application pages sent down with rds_sendmsg() are pinned.
The pinning uses the accounting infrastructure added by
Commit a91dbff551a6 ("sock: ulimit on MSG_ZEROCOPY pages")
The payload bytes in the message may not be modified for the
duration that the message has been pinned. A multi-threaded
application using this infrastructure may thus need to be notified
about send-completion so that it can free/reuse the buffers
passed to rds_sendmsg(). Notification of send-completion will
identify each message-buffer by a cookie that the application
must specify as ancillary data to rds_sendmsg().
The ancillary data in this case has cmsg_level == SOL_RDS
and cmsg_type == RDS_CMSG_ZCOPY_COOKIE.
Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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RDS removes a datagram (rds_message) from the retransmit queue when
an ACK is received. The ACK indicates that the receiver has queued
the RDS datagram, so that the sender can safely forget the datagram.
When all references to the rds_message are quiesced, rds_message_purge
is called to release resources used by the rds_message
If the datagram to be removed had pinned pages set up, add
an entry to the rs->rs_znotify_queue so that the notifcation
will be sent up via rds_rm_zerocopy_callback() when the
rds_message is eventually freed by rds_message_purge.
rds_rm_zerocopy_callback() attempts to batch the number of cookies
sent with each notification to a max of SO_EE_ORIGIN_MAX_ZCOOKIES.
This is achieved by checking the tail skb in the sk_error_queue:
if this has room for one more cookie, the cookie from the
current notification is added; else a new skb is added to the
sk_error_queue. Every invocation of rds_rm_zerocopy_callback() will
trigger a ->sk_error_report to notify the application.
Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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allow the application to set SO_ZEROCOPY on the underlying sk
of a PF_RDS socket
Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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The existing model holds a reference from the rds_sock to the
rds_message, but the rds_message does not itself hold a sock_put()
on the rds_sock. Instead the m_rs field in the rds_message is
assigned when the message is queued on the sock, and nulled when
the message is dequeued from the sock.
We want to be able to notify userspace when the rds_message
is actually freed (from rds_message_purge(), after the refcounts
to the rds_message go to 0). At the time that rds_message_purge()
is called, the message is no longer on the rds_sock retransmit
queue. Thus the explicit reference for the m_rs is needed to
send a notification that will signal to userspace that
it is now safe to free/reuse any pages that may have
been pinned down for zerocopy.
This patch manages the m_rs assignment in the rds_message with
the necessary refcount book-keeping.
Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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