2019-05-19 13:08:20 +01:00
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2005-04-16 15:20:36 -07:00
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2007-12-30 23:18:29 -08:00
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2005-04-16 15:20:36 -07:00
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2010-01-26 11:40:00 +00:00
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2005-04-16 15:20:36 -07:00
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2010-01-26 11:40:04 +00:00
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include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 17:04:11 +09:00
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2005-04-16 15:20:36 -07:00
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2006-01-11 12:17:47 -08:00
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2005-04-16 15:20:36 -07:00
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2010-01-26 11:40:04 +00:00
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2005-04-16 15:20:36 -07:00
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2010-01-26 11:40:04 +00:00
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2005-04-16 15:20:36 -07:00
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2010-01-26 11:40:04 +00:00
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2005-04-16 15:20:36 -07:00
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2007-12-30 23:17:53 -08:00
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2008-06-17 16:20:06 -07:00
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2007-12-30 23:18:29 -08:00
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2011-08-17 08:37:52 +02:00
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2008-06-17 16:20:06 -07:00
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2005-04-16 15:20:36 -07:00
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2007-12-30 23:18:29 -08:00
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2005-04-16 15:20:36 -07:00
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2007-12-30 23:18:29 -08:00
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2005-04-16 15:20:36 -07:00
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2007-12-30 23:18:29 -08:00
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2010-01-26 11:40:04 +00:00
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2009-09-02 23:26:39 -07:00
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2012-11-27 23:28:36 +00:00
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2012-11-28 00:46:45 +00:00
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2005-04-16 15:20:36 -07:00
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2012-04-15 05:58:06 +00:00
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atm: br2684: Fix excessive queue bloat
There's really no excuse for an additional wmem_default of buffering
between the netdev queue and the ATM device. Two packets (one in-flight,
and one ready to send) ought to be fine. It's not as if it should take
long to get another from the netdev queue when we need it.
If necessary we can make the queue space configurable later, but I don't
think it's likely to be necessary.
cf. commit 9d02daf754238adac48fa075ee79e7edd3d79ed3 (pppoatm: Fix
excessive queue bloat) which did something very similar for PPPoATM.
Note that there is a tremendously unlikely race condition which may
result in qspace temporarily going negative. If a CPU running the
br2684_pop() function goes off into the weeds for a long period of time
after incrementing qspace to 1, but before calling netdev_wake_queue()...
and another CPU ends up calling br2684_start_xmit() and *stopping* the
queue again before the first CPU comes back, the netdev queue could
end up being woken when qspace has already reached zero.
An alternative approach to coping with this race would be to check in
br2684_start_xmit() for qspace==0 and return NETDEV_TX_BUSY, but just
using '> 0' and '< 1' for comparison instead of '== 0' and '!= 0' is
simpler. It just warranted a mention of *why* we do it that way...
Move the call to atmvcc->send() to happen *after* the accounting and
potentially stopping the netdev queue, in br2684_xmit_vcc(). This matters
if the ->send() call suffers an immediate failure, because it'll call
br2684_pop() with the offending skb before returning. We want that to
happen *after* we've done the initial accounting for the packet in
question. Also make it return an appropriate success/failure indication
while we're at it.
Tested by running 'ping -l 1000 bottomless.aaisp.net.uk' from within my
network, with only a single PPPoE-over-BR2684 link running. And after
setting txqueuelen on the nas0 interface to something low (5, in fact).
Before the patch, we'd see about 15 packets being queued and a resulting
latency of ~56ms being reached. After the patch, we see only about 8,
which is fairly much what we expect. And a max latency of ~36ms. On this
OpenWRT box, wmem_default is 163840.
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Reviewed-by: Krzysztof Mazur <krzysiek@podlesie.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-11-25 12:06:52 +00:00
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2005-04-16 15:20:36 -07:00
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2007-12-30 23:18:29 -08:00
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2005-04-16 15:20:36 -07:00
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2007-12-30 23:17:53 -08:00
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2005-04-16 15:20:36 -07:00
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2021-06-06 23:33:07 -07:00
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2005-04-16 15:20:36 -07:00
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2010-11-15 11:12:33 +00:00
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2005-04-16 15:20:36 -07:00
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2007-12-30 23:18:29 -08:00
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2005-04-16 15:20:36 -07:00
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2010-07-08 20:55:31 +00:00
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2009-09-02 23:26:39 -07:00
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atm: br2684: Fix excessive queue bloat
There's really no excuse for an additional wmem_default of buffering
between the netdev queue and the ATM device. Two packets (one in-flight,
and one ready to send) ought to be fine. It's not as if it should take
long to get another from the netdev queue when we need it.
If necessary we can make the queue space configurable later, but I don't
think it's likely to be necessary.
cf. commit 9d02daf754238adac48fa075ee79e7edd3d79ed3 (pppoatm: Fix
excessive queue bloat) which did something very similar for PPPoATM.
Note that there is a tremendously unlikely race condition which may
result in qspace temporarily going negative. If a CPU running the
br2684_pop() function goes off into the weeds for a long period of time
after incrementing qspace to 1, but before calling netdev_wake_queue()...
and another CPU ends up calling br2684_start_xmit() and *stopping* the
queue again before the first CPU comes back, the netdev queue could
end up being woken when qspace has already reached zero.
An alternative approach to coping with this race would be to check in
br2684_start_xmit() for qspace==0 and return NETDEV_TX_BUSY, but just
using '> 0' and '< 1' for comparison instead of '== 0' and '!= 0' is
simpler. It just warranted a mention of *why* we do it that way...
Move the call to atmvcc->send() to happen *after* the accounting and
potentially stopping the netdev queue, in br2684_xmit_vcc(). This matters
if the ->send() call suffers an immediate failure, because it'll call
br2684_pop() with the offending skb before returning. We want that to
happen *after* we've done the initial accounting for the packet in
question. Also make it return an appropriate success/failure indication
while we're at it.
Tested by running 'ping -l 1000 bottomless.aaisp.net.uk' from within my
network, with only a single PPPoE-over-BR2684 link running. And after
setting txqueuelen on the nas0 interface to something low (5, in fact).
Before the patch, we'd see about 15 packets being queued and a resulting
latency of ~56ms being reached. After the patch, we see only about 8,
which is fairly much what we expect. And a max latency of ~36ms. On this
OpenWRT box, wmem_default is 163840.
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Reviewed-by: Krzysztof Mazur <krzysiek@podlesie.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-11-25 12:06:52 +00:00
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2009-09-02 23:26:39 -07:00
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atm: br2684: Fix excessive queue bloat
There's really no excuse for an additional wmem_default of buffering
between the netdev queue and the ATM device. Two packets (one in-flight,
and one ready to send) ought to be fine. It's not as if it should take
long to get another from the netdev queue when we need it.
If necessary we can make the queue space configurable later, but I don't
think it's likely to be necessary.
cf. commit 9d02daf754238adac48fa075ee79e7edd3d79ed3 (pppoatm: Fix
excessive queue bloat) which did something very similar for PPPoATM.
Note that there is a tremendously unlikely race condition which may
result in qspace temporarily going negative. If a CPU running the
br2684_pop() function goes off into the weeds for a long period of time
after incrementing qspace to 1, but before calling netdev_wake_queue()...
and another CPU ends up calling br2684_start_xmit() and *stopping* the
queue again before the first CPU comes back, the netdev queue could
end up being woken when qspace has already reached zero.
An alternative approach to coping with this race would be to check in
br2684_start_xmit() for qspace==0 and return NETDEV_TX_BUSY, but just
using '> 0' and '< 1' for comparison instead of '== 0' and '!= 0' is
simpler. It just warranted a mention of *why* we do it that way...
Move the call to atmvcc->send() to happen *after* the accounting and
potentially stopping the netdev queue, in br2684_xmit_vcc(). This matters
if the ->send() call suffers an immediate failure, because it'll call
br2684_pop() with the offending skb before returning. We want that to
happen *after* we've done the initial accounting for the packet in
question. Also make it return an appropriate success/failure indication
while we're at it.
Tested by running 'ping -l 1000 bottomless.aaisp.net.uk' from within my
network, with only a single PPPoE-over-BR2684 link running. And after
setting txqueuelen on the nas0 interface to something low (5, in fact).
Before the patch, we'd see about 15 packets being queued and a resulting
latency of ~56ms being reached. After the patch, we see only about 8,
which is fairly much what we expect. And a max latency of ~36ms. On this
OpenWRT box, wmem_default is 163840.
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Reviewed-by: Krzysztof Mazur <krzysiek@podlesie.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-11-25 12:06:52 +00:00
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2009-09-02 23:26:39 -07:00
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atm: br2684: Fix excessive queue bloat
There's really no excuse for an additional wmem_default of buffering
between the netdev queue and the ATM device. Two packets (one in-flight,
and one ready to send) ought to be fine. It's not as if it should take
long to get another from the netdev queue when we need it.
If necessary we can make the queue space configurable later, but I don't
think it's likely to be necessary.
cf. commit 9d02daf754238adac48fa075ee79e7edd3d79ed3 (pppoatm: Fix
excessive queue bloat) which did something very similar for PPPoATM.
Note that there is a tremendously unlikely race condition which may
result in qspace temporarily going negative. If a CPU running the
br2684_pop() function goes off into the weeds for a long period of time
after incrementing qspace to 1, but before calling netdev_wake_queue()...
and another CPU ends up calling br2684_start_xmit() and *stopping* the
queue again before the first CPU comes back, the netdev queue could
end up being woken when qspace has already reached zero.
An alternative approach to coping with this race would be to check in
br2684_start_xmit() for qspace==0 and return NETDEV_TX_BUSY, but just
using '> 0' and '< 1' for comparison instead of '== 0' and '!= 0' is
simpler. It just warranted a mention of *why* we do it that way...
Move the call to atmvcc->send() to happen *after* the accounting and
potentially stopping the netdev queue, in br2684_xmit_vcc(). This matters
if the ->send() call suffers an immediate failure, because it'll call
br2684_pop() with the offending skb before returning. We want that to
happen *after* we've done the initial accounting for the packet in
question. Also make it return an appropriate success/failure indication
while we're at it.
Tested by running 'ping -l 1000 bottomless.aaisp.net.uk' from within my
network, with only a single PPPoE-over-BR2684 link running. And after
setting txqueuelen on the nas0 interface to something low (5, in fact).
Before the patch, we'd see about 15 packets being queued and a resulting
latency of ~56ms being reached. After the patch, we see only about 8,
which is fairly much what we expect. And a max latency of ~36ms. On this
OpenWRT box, wmem_default is 163840.
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Reviewed-by: Krzysztof Mazur <krzysiek@podlesie.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-11-25 12:06:52 +00:00
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2005-04-16 15:20:36 -07:00
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2009-01-09 13:00:58 +00:00
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2007-12-30 23:18:29 -08:00
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2005-04-16 15:20:36 -07:00
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2009-01-09 13:00:58 +00:00
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2005-04-16 15:20:36 -07:00
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2011-08-17 08:37:18 +02:00
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2007-12-30 23:17:53 -08:00
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2005-04-16 15:20:36 -07:00
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2007-12-30 23:17:53 -08:00
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2007-12-30 23:18:29 -08:00
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2007-12-30 23:17:53 -08:00
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2007-12-30 23:18:29 -08:00
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2007-12-30 23:17:53 -08:00
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2008-06-16 17:18:18 -07:00
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2007-12-30 23:17:53 -08:00
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2008-06-16 17:18:18 -07:00
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2007-12-30 23:17:53 -08:00
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2005-04-16 15:20:36 -07:00
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2007-08-28 15:22:09 -07:00
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atm: Preserve value of skb->truesize when accounting to vcc
ATM accounts for in-flight TX packets in sk_wmem_alloc of the VCC on
which they are to be sent. But it doesn't take ownership of those
packets from the sock (if any) which originally owned them. They should
remain owned by their actual sender until they've left the box.
There's a hack in pskb_expand_head() to avoid adjusting skb->truesize
for certain skbs, precisely to avoid messing up sk_wmem_alloc
accounting. Ideally that hack would cover the ATM use case too, but it
doesn't — skbs which aren't owned by any sock, for example PPP control
frames, still get their truesize adjusted when the low-level ATM driver
adds headroom.
This has always been an issue, it seems. The truesize of a packet
increases, and sk_wmem_alloc on the VCC goes negative. But this wasn't
for normal traffic, only for control frames. So I think we just got away
with it, and we probably needed to send 2GiB of LCP echo frames before
the misaccounting would ever have caused a problem and caused
atm_may_send() to start refusing packets.
Commit 14afee4b609 ("net: convert sock.sk_wmem_alloc from atomic_t to
refcount_t") did exactly what it was intended to do, and turned this
mostly-theoretical problem into a real one, causing PPPoATM to fail
immediately as sk_wmem_alloc underflows and atm_may_send() *immediately*
starts refusing to allow new packets.
The least intrusive solution to this problem is to stash the value of
skb->truesize that was accounted to the VCC, in a new member of the
ATM_SKB(skb) structure. Then in atm_pop_raw() subtract precisely that
value instead of the then-current value of skb->truesize.
Fixes: 158f323b9868 ("net: adjust skb->truesize in pskb_expand_head()")
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Tested-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
2018-06-16 11:55:44 +01:00
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2009-01-09 13:00:58 +00:00
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2009-09-02 23:26:39 -07:00
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atm: br2684: Fix excessive queue bloat
There's really no excuse for an additional wmem_default of buffering
between the netdev queue and the ATM device. Two packets (one in-flight,
and one ready to send) ought to be fine. It's not as if it should take
long to get another from the netdev queue when we need it.
If necessary we can make the queue space configurable later, but I don't
think it's likely to be necessary.
cf. commit 9d02daf754238adac48fa075ee79e7edd3d79ed3 (pppoatm: Fix
excessive queue bloat) which did something very similar for PPPoATM.
Note that there is a tremendously unlikely race condition which may
result in qspace temporarily going negative. If a CPU running the
br2684_pop() function goes off into the weeds for a long period of time
after incrementing qspace to 1, but before calling netdev_wake_queue()...
and another CPU ends up calling br2684_start_xmit() and *stopping* the
queue again before the first CPU comes back, the netdev queue could
end up being woken when qspace has already reached zero.
An alternative approach to coping with this race would be to check in
br2684_start_xmit() for qspace==0 and return NETDEV_TX_BUSY, but just
using '> 0' and '< 1' for comparison instead of '== 0' and '!= 0' is
simpler. It just warranted a mention of *why* we do it that way...
Move the call to atmvcc->send() to happen *after* the accounting and
potentially stopping the netdev queue, in br2684_xmit_vcc(). This matters
if the ->send() call suffers an immediate failure, because it'll call
br2684_pop() with the offending skb before returning. We want that to
happen *after* we've done the initial accounting for the packet in
question. Also make it return an appropriate success/failure indication
while we're at it.
Tested by running 'ping -l 1000 bottomless.aaisp.net.uk' from within my
network, with only a single PPPoE-over-BR2684 link running. And after
setting txqueuelen on the nas0 interface to something low (5, in fact).
Before the patch, we'd see about 15 packets being queued and a resulting
latency of ~56ms being reached. After the patch, we see only about 8,
which is fairly much what we expect. And a max latency of ~36ms. On this
OpenWRT box, wmem_default is 163840.
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Reviewed-by: Krzysztof Mazur <krzysiek@podlesie.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-11-25 12:06:52 +00:00
|
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|
2009-09-02 23:26:39 -07:00
|
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|
|
atm: br2684: Fix excessive queue bloat
There's really no excuse for an additional wmem_default of buffering
between the netdev queue and the ATM device. Two packets (one in-flight,
and one ready to send) ought to be fine. It's not as if it should take
long to get another from the netdev queue when we need it.
If necessary we can make the queue space configurable later, but I don't
think it's likely to be necessary.
cf. commit 9d02daf754238adac48fa075ee79e7edd3d79ed3 (pppoatm: Fix
excessive queue bloat) which did something very similar for PPPoATM.
Note that there is a tremendously unlikely race condition which may
result in qspace temporarily going negative. If a CPU running the
br2684_pop() function goes off into the weeds for a long period of time
after incrementing qspace to 1, but before calling netdev_wake_queue()...
and another CPU ends up calling br2684_start_xmit() and *stopping* the
queue again before the first CPU comes back, the netdev queue could
end up being woken when qspace has already reached zero.
An alternative approach to coping with this race would be to check in
br2684_start_xmit() for qspace==0 and return NETDEV_TX_BUSY, but just
using '> 0' and '< 1' for comparison instead of '== 0' and '!= 0' is
simpler. It just warranted a mention of *why* we do it that way...
Move the call to atmvcc->send() to happen *after* the accounting and
potentially stopping the netdev queue, in br2684_xmit_vcc(). This matters
if the ->send() call suffers an immediate failure, because it'll call
br2684_pop() with the offending skb before returning. We want that to
happen *after* we've done the initial accounting for the packet in
question. Also make it return an appropriate success/failure indication
while we're at it.
Tested by running 'ping -l 1000 bottomless.aaisp.net.uk' from within my
network, with only a single PPPoE-over-BR2684 link running. And after
setting txqueuelen on the nas0 interface to something low (5, in fact).
Before the patch, we'd see about 15 packets being queued and a resulting
latency of ~56ms being reached. After the patch, we see only about 8,
which is fairly much what we expect. And a max latency of ~36ms. On this
OpenWRT box, wmem_default is 163840.
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Reviewed-by: Krzysztof Mazur <krzysiek@podlesie.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-11-25 12:06:52 +00:00
|
|
|
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|
|
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|
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|
|
|
2009-09-02 23:26:39 -07:00
|
|
|
|
|
|
|
|
|
atm: br2684: Fix excessive queue bloat
There's really no excuse for an additional wmem_default of buffering
between the netdev queue and the ATM device. Two packets (one in-flight,
and one ready to send) ought to be fine. It's not as if it should take
long to get another from the netdev queue when we need it.
If necessary we can make the queue space configurable later, but I don't
think it's likely to be necessary.
cf. commit 9d02daf754238adac48fa075ee79e7edd3d79ed3 (pppoatm: Fix
excessive queue bloat) which did something very similar for PPPoATM.
Note that there is a tremendously unlikely race condition which may
result in qspace temporarily going negative. If a CPU running the
br2684_pop() function goes off into the weeds for a long period of time
after incrementing qspace to 1, but before calling netdev_wake_queue()...
and another CPU ends up calling br2684_start_xmit() and *stopping* the
queue again before the first CPU comes back, the netdev queue could
end up being woken when qspace has already reached zero.
An alternative approach to coping with this race would be to check in
br2684_start_xmit() for qspace==0 and return NETDEV_TX_BUSY, but just
using '> 0' and '< 1' for comparison instead of '== 0' and '!= 0' is
simpler. It just warranted a mention of *why* we do it that way...
Move the call to atmvcc->send() to happen *after* the accounting and
potentially stopping the netdev queue, in br2684_xmit_vcc(). This matters
if the ->send() call suffers an immediate failure, because it'll call
br2684_pop() with the offending skb before returning. We want that to
happen *after* we've done the initial accounting for the packet in
question. Also make it return an appropriate success/failure indication
while we're at it.
Tested by running 'ping -l 1000 bottomless.aaisp.net.uk' from within my
network, with only a single PPPoE-over-BR2684 link running. And after
setting txqueuelen on the nas0 interface to something low (5, in fact).
Before the patch, we'd see about 15 packets being queued and a resulting
latency of ~56ms being reached. After the patch, we see only about 8,
which is fairly much what we expect. And a max latency of ~36ms. On this
OpenWRT box, wmem_default is 163840.
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Reviewed-by: Krzysztof Mazur <krzysiek@podlesie.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-11-25 12:06:52 +00:00
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2005-04-16 15:20:36 -07:00
|
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|
2012-11-27 23:28:36 +00:00
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2008-06-17 16:20:06 -07:00
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2005-04-16 15:20:36 -07:00
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2007-12-30 23:18:29 -08:00
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2005-04-16 15:20:36 -07:00
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2009-08-31 19:50:42 +00:00
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2005-04-16 15:20:36 -07:00
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2012-11-27 23:28:36 +00:00
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2005-04-16 15:20:36 -07:00
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2010-01-26 11:40:00 +00:00
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2005-04-16 15:20:36 -07:00
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2007-08-28 15:22:09 -07:00
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2009-01-09 13:00:58 +00:00
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2005-04-16 15:20:36 -07:00
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2012-11-27 23:28:36 +00:00
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2005-04-16 15:20:36 -07:00
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2012-11-27 23:28:36 +00:00
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2026-06-15 12:44:12 -07:00
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2012-11-27 23:28:36 +00:00
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2009-01-09 13:00:58 +00:00
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2005-04-16 15:20:36 -07:00
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2007-12-30 23:18:29 -08:00
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2005-04-16 15:20:36 -07:00
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2009-01-09 13:00:58 +00:00
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2005-04-16 15:20:36 -07:00
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2012-11-27 23:28:36 +00:00
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2005-04-16 15:20:36 -07:00
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2012-11-27 23:28:36 +00:00
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2005-04-16 15:20:36 -07:00
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2009-01-09 13:00:59 +00:00
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2005-04-16 15:20:36 -07:00
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2007-12-30 23:18:29 -08:00
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2005-04-16 15:20:36 -07:00
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2007-12-30 23:18:29 -08:00
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2005-04-16 15:20:36 -07:00
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2010-01-26 11:40:04 +00:00
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2005-04-16 15:20:36 -07:00
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2006-11-14 21:11:29 -08:00
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2005-04-16 15:20:36 -07:00
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2007-12-30 23:18:29 -08:00
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2007-03-25 20:12:32 -07:00
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2007-12-30 23:18:29 -08:00
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2005-04-16 15:20:36 -07:00
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2007-03-25 20:12:32 -07:00
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2005-04-16 15:20:36 -07:00
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2007-12-30 23:18:29 -08:00
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2005-04-16 15:20:36 -07:00
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2007-08-28 15:22:09 -07:00
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2005-04-16 15:20:36 -07:00
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2012-11-27 23:28:36 +00:00
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2005-04-16 15:20:36 -07:00
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2012-11-28 00:46:45 +00:00
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2005-04-16 15:20:36 -07:00
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2010-01-26 11:40:00 +00:00
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2005-04-16 15:20:36 -07:00
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2008-05-04 18:00:36 -07:00
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2005-04-16 15:20:36 -07:00
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2008-05-04 18:00:36 -07:00
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2005-04-16 15:20:36 -07:00
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2008-05-06 00:00:16 -07:00
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2005-04-16 15:20:36 -07:00
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2007-08-28 15:22:09 -07:00
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2005-04-16 15:20:36 -07:00
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2007-12-30 23:17:53 -08:00
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2010-01-26 11:40:04 +00:00
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2008-09-20 22:20:49 -07:00
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2010-01-26 11:40:04 +00:00
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2008-09-20 22:20:49 -07:00
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2008-06-16 17:18:18 -07:00
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2007-12-30 23:17:53 -08:00
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2010-01-26 11:40:04 +00:00
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2007-12-30 23:17:53 -08:00
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2007-12-30 23:18:29 -08:00
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2007-12-30 23:17:53 -08:00
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2008-06-16 17:18:18 -07:00
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2005-04-16 15:20:36 -07:00
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2008-06-16 17:18:18 -07:00
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2008-09-20 22:20:49 -07:00
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2008-06-16 17:18:18 -07:00
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2008-09-20 22:20:49 -07:00
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2008-06-16 17:18:18 -07:00
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2011-08-17 08:37:52 +02:00
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2008-06-16 17:18:18 -07:00
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2005-04-16 15:20:36 -07:00
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2008-06-16 17:18:18 -07:00
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2005-04-16 15:20:36 -07:00
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2007-08-28 15:22:09 -07:00
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2005-04-16 15:20:36 -07:00
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2008-06-16 17:18:18 -07:00
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2009-01-09 13:00:58 +00:00
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2005-04-16 15:20:36 -07:00
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2008-06-16 17:18:18 -07:00
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2009-01-09 13:00:58 +00:00
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2008-06-16 17:18:18 -07:00
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2009-01-09 13:00:58 +00:00
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2008-06-16 17:18:18 -07:00
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2005-04-16 15:20:36 -07:00
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2007-12-30 23:18:29 -08:00
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2005-04-16 15:20:36 -07:00
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2011-11-21 10:25:57 +00:00
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2005-04-16 15:20:36 -07:00
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2026-02-21 16:37:42 -08:00
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2005-04-16 15:20:36 -07:00
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atm: br2684: Fix excessive queue bloat
There's really no excuse for an additional wmem_default of buffering
between the netdev queue and the ATM device. Two packets (one in-flight,
and one ready to send) ought to be fine. It's not as if it should take
long to get another from the netdev queue when we need it.
If necessary we can make the queue space configurable later, but I don't
think it's likely to be necessary.
cf. commit 9d02daf754238adac48fa075ee79e7edd3d79ed3 (pppoatm: Fix
excessive queue bloat) which did something very similar for PPPoATM.
Note that there is a tremendously unlikely race condition which may
result in qspace temporarily going negative. If a CPU running the
br2684_pop() function goes off into the weeds for a long period of time
after incrementing qspace to 1, but before calling netdev_wake_queue()...
and another CPU ends up calling br2684_start_xmit() and *stopping* the
queue again before the first CPU comes back, the netdev queue could
end up being woken when qspace has already reached zero.
An alternative approach to coping with this race would be to check in
br2684_start_xmit() for qspace==0 and return NETDEV_TX_BUSY, but just
using '> 0' and '< 1' for comparison instead of '== 0' and '!= 0' is
simpler. It just warranted a mention of *why* we do it that way...
Move the call to atmvcc->send() to happen *after* the accounting and
potentially stopping the netdev queue, in br2684_xmit_vcc(). This matters
if the ->send() call suffers an immediate failure, because it'll call
br2684_pop() with the offending skb before returning. We want that to
happen *after* we've done the initial accounting for the packet in
question. Also make it return an appropriate success/failure indication
while we're at it.
Tested by running 'ping -l 1000 bottomless.aaisp.net.uk' from within my
network, with only a single PPPoE-over-BR2684 link running. And after
setting txqueuelen on the nas0 interface to something low (5, in fact).
Before the patch, we'd see about 15 packets being queued and a resulting
latency of ~56ms being reached. After the patch, we see only about 8,
which is fairly much what we expect. And a max latency of ~36ms. On this
OpenWRT box, wmem_default is 163840.
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Reviewed-by: Krzysztof Mazur <krzysiek@podlesie.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-11-25 12:06:52 +00:00
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2005-04-16 15:20:36 -07:00
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2011-03-30 22:57:33 -03:00
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2005-04-16 15:20:36 -07:00
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2010-01-26 11:40:04 +00:00
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2005-04-16 15:20:36 -07:00
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2010-01-26 11:40:00 +00:00
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2005-04-16 15:20:36 -07:00
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2021-10-22 16:21:03 -07:00
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2005-04-16 15:20:36 -07:00
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2021-10-08 10:53:39 -07:00
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2005-04-16 15:20:36 -07:00
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2021-10-22 16:21:03 -07:00
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2005-04-16 15:20:36 -07:00
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2007-12-30 23:18:29 -08:00
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2005-04-16 15:20:36 -07:00
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2009-09-02 23:26:39 -07:00
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2012-11-27 23:28:36 +00:00
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2012-11-28 00:46:45 +00:00
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2005-04-16 15:20:36 -07:00
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2009-09-02 23:26:39 -07:00
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2012-11-27 23:28:36 +00:00
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2012-11-28 00:46:45 +00:00
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2006-11-30 21:05:23 -08:00
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2010-07-08 20:55:31 +00:00
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2005-04-16 15:20:36 -07:00
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2011-11-21 10:25:57 +00:00
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2005-04-16 15:20:36 -07:00
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2010-01-26 11:40:04 +00:00
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2005-04-16 15:20:36 -07:00
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2009-01-09 13:00:59 +00:00
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2009-12-04 11:06:32 +00:00
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2005-04-16 15:20:36 -07:00
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2011-08-17 08:37:18 +02:00
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2009-05-02 13:49:36 -07:00
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2005-04-16 15:20:36 -07:00
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2009-01-09 13:00:59 +00:00
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2005-04-16 15:20:36 -07:00
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2007-12-30 23:17:53 -08:00
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2009-12-04 11:06:32 +00:00
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2007-12-30 23:17:53 -08:00
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2011-08-17 08:37:18 +02:00
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2009-12-04 11:06:32 +00:00
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2007-12-30 23:17:53 -08:00
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2016-10-20 23:25:27 -04:00
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2007-12-30 23:17:53 -08:00
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2010-01-26 11:40:04 +00:00
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2005-04-16 15:20:36 -07:00
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2007-12-30 23:17:53 -08:00
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2005-04-16 15:20:36 -07:00
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2010-01-26 11:40:00 +00:00
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2005-04-16 15:20:36 -07:00
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2010-01-26 11:40:04 +00:00
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2005-04-16 15:20:36 -07:00
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2007-12-30 23:17:53 -08:00
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2007-12-30 23:18:29 -08:00
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2007-12-30 23:17:53 -08:00
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2010-01-26 11:40:04 +00:00
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2005-04-16 15:20:36 -07:00
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net: set name_assign_type in alloc_netdev()
Extend alloc_netdev{,_mq{,s}}() to take name_assign_type as argument, and convert
all users to pass NET_NAME_UNKNOWN.
Coccinelle patch:
@@
expression sizeof_priv, name, setup, txqs, rxqs, count;
@@
(
-alloc_netdev_mqs(sizeof_priv, name, setup, txqs, rxqs)
+alloc_netdev_mqs(sizeof_priv, name, NET_NAME_UNKNOWN, setup, txqs, rxqs)
|
-alloc_netdev_mq(sizeof_priv, name, setup, count)
+alloc_netdev_mq(sizeof_priv, name, NET_NAME_UNKNOWN, setup, count)
|
-alloc_netdev(sizeof_priv, name, setup)
+alloc_netdev(sizeof_priv, name, NET_NAME_UNKNOWN, setup)
)
v9: move comments here from the wrong commit
Signed-off-by: Tom Gundersen <teg@jklm.no>
Reviewed-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-14 16:37:24 +02:00
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2005-04-16 15:20:36 -07:00
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2007-08-28 15:22:09 -07:00
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2005-04-16 15:20:36 -07:00
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2010-01-26 11:40:00 +00:00
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2005-04-16 15:20:36 -07:00
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2010-07-08 20:55:31 +00:00
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2007-12-30 23:17:53 -08:00
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2010-07-08 20:55:31 +00:00
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2005-04-16 15:20:36 -07:00
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2007-12-30 23:18:29 -08:00
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2005-04-16 15:20:36 -07:00
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2007-12-30 23:18:29 -08:00
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2005-04-16 15:20:36 -07:00
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2007-12-30 23:18:29 -08:00
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2005-04-16 15:20:36 -07:00
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2007-12-30 23:18:29 -08:00
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2005-04-16 15:20:36 -07:00
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2012-11-28 09:08:04 +01:00
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2005-04-16 15:20:36 -07:00
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2012-11-28 09:08:04 +01:00
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2005-04-16 15:20:36 -07:00
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2012-11-28 09:08:04 +01:00
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2005-04-16 15:20:36 -07:00
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2007-12-30 23:18:29 -08:00
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2007-12-30 23:18:29 -08:00
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2005-04-16 15:20:36 -07:00
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2007-12-30 23:18:29 -08:00
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2008-01-15 03:29:50 -08:00
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2005-04-16 15:20:36 -07:00
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2007-07-09 13:12:24 -07:00
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2005-04-16 15:20:36 -07:00
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2007-12-30 23:18:29 -08:00
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2007-07-09 13:12:24 -07:00
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2008-01-15 03:29:50 -08:00
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2008-10-27 15:59:26 -07:00
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2007-12-30 23:18:29 -08:00
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2015-07-30 23:54:28 -07:00
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2018-04-13 19:44:18 +02:00
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2008-02-28 13:55:45 -08:00
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2005-04-16 15:20:36 -07:00
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2010-09-23 01:50:54 +00:00
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2010-07-08 20:55:31 +00:00
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2010-09-23 01:50:54 +00:00
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2010-07-08 20:55:31 +00:00
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2005-04-16 15:20:36 -07:00
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2008-05-06 00:00:16 -07:00
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2005-04-16 15:20:36 -07:00
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