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  1. 10 Aug, 2015 12 commits
    • David S. Miller's avatar
      Merge branch 'bnx2x-fixes' · 875a74b6
      David S. Miller authored 
      Yuval Mintz says:

====================
bnx2x: small fixes

This adds 2 small fixes, one to error flows during memory release
and the other to flash writes via ethtool API.
====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      875a74b6
    • Yuval Mintz's avatar
      bnx2x: Free NVRAM lock at end of each page · 0ea853df
      Yuval Mintz authored 
      Writing each 4Kb page into flash might take up-to ~100 miliseconds,
during which time management firmware cannot acces the nvram for its
own uses.

Firmware upgrade utility use the ethtool API to burn new flash images
for the device via the ethtool API, doing so by writing several page-worth
of data on each command. Such action might create problems for the
management firmware, as the nvram might not be accessible for a long time.

This patch changes the write implementation, releasing the nvram lock on
the completion of each page, allowing the management firmware time to
claim it and perform its own required actions.
Signed-off-by: default avatarYuval Mintz <Yuval.Mintz@qlogic.com>
Signed-off-by: default avatarAriel Elior <Ariel.Elior@qlogic.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      0ea853df
    • Yuval Mintz's avatar
      bnx2x: Prevent null pointer dereference on SKB release · e1615903
      Yuval Mintz authored 
      On error flows its possible to free an SKB even if it was not allocated.
Signed-off-by: default avatarYuval Mintz <Yuval.Mintz@qlogic.com>
Signed-off-by: default avatarAriel Elior <Ariel.Elior@qlogic.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      e1615903
    • Dan Carpenter's avatar
      cxgb4: missing curly braces in t4_setup_debugfs() · 21a44763
      Dan Carpenter authored 
      There were missing curly braces so it means we call add_debugfs_mem()
unintentionally.

Fixes: 3ccc6cf7 ('cxgb4: Adds support for T6 adapter')
Signed-off-by: default avatarDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      21a44763
    • Benjamin Poirier's avatar
      net-timestamp: Update skb_complete_tx_timestamp comment · 7a76a021
      Benjamin Poirier authored 
      After "62bccb8c net-timestamp: Make the clone operation stand-alone from phy
timestamping" the hwtstamps parameter of skb_complete_tx_timestamp() may no
longer be NULL.
Signed-off-by: default avatarBenjamin Poirier <bpoirier@suse.com>
Cc: Alexander Duyck <alexander.h.duyck@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      7a76a021
    • Florian Westphal's avatar
      ipv6: don't reject link-local nexthop on other interface · 330567b7
      Florian Westphal authored 
      48ed7b26 ("ipv6: reject locally assigned nexthop addresses") is too
strict; it rejects following corner-case:

ip -6 route add default via fe80::1:2:3 dev eth1

[ where fe80::1:2:3 is assigned to a local interface, but not eth1 ]

Fix this by restricting search to given device if nh is linklocal.

Joint work with Hannes Frederic Sowa.

Fixes: 48ed7b26 ("ipv6: reject locally assigned nexthop addresses")
Signed-off-by: default avatarHannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: default avatarFlorian Westphal <fw@strlen.de>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      330567b7
    • Daniel Borkmann's avatar
      netlink: make sure -EBUSY won't escape from netlink_insert · 4e7c1330
      Daniel Borkmann authored 
      Linus reports the following deadlock on rtnl_mutex; triggered only
once so far (extract):

[12236.694209] NetworkManager  D 0000000000013b80     0  1047      1 0x00000000
[12236.694218]  ffff88003f902640 0000000000000000 ffffffff815d15a9 0000000000000018
[12236.694224]  ffff880119538000 ffff88003f902640 ffffffff81a8ff84 00000000ffffffff
[12236.694230]  ffffffff81a8ff88 ffff880119c47f00 ffffffff815d133a ffffffff81a8ff80
[12236.694235] Call Trace:
[12236.694250]  [<ffffffff815d15a9>] ? schedule_preempt_disabled+0x9/0x10
[12236.694257]  [<ffffffff815d133a>] ? schedule+0x2a/0x70
[12236.694263]  [<ffffffff815d15a9>] ? schedule_preempt_disabled+0x9/0x10
[12236.694271]  [<ffffffff815d2c3f>] ? __mutex_lock_slowpath+0x7f/0xf0
[12236.694280]  [<ffffffff815d2cc6>] ? mutex_lock+0x16/0x30
[12236.694291]  [<ffffffff814f1f90>] ? rtnetlink_rcv+0x10/0x30
[12236.694299]  [<ffffffff8150ce3b>] ? netlink_unicast+0xfb/0x180
[12236.694309]  [<ffffffff814f5ad3>] ? rtnl_getlink+0x113/0x190
[12236.694319]  [<ffffffff814f202a>] ? rtnetlink_rcv_msg+0x7a/0x210
[12236.694331]  [<ffffffff8124565c>] ? sock_has_perm+0x5c/0x70
[12236.694339]  [<ffffffff814f1fb0>] ? rtnetlink_rcv+0x30/0x30
[12236.694346]  [<ffffffff8150d62c>] ? netlink_rcv_skb+0x9c/0xc0
[12236.694354]  [<ffffffff814f1f9f>] ? rtnetlink_rcv+0x1f/0x30
[12236.694360]  [<ffffffff8150ce3b>] ? netlink_unicast+0xfb/0x180
[12236.694367]  [<ffffffff8150d344>] ? netlink_sendmsg+0x484/0x5d0
[12236.694376]  [<ffffffff810a236f>] ? __wake_up+0x2f/0x50
[12236.694387]  [<ffffffff814cad23>] ? sock_sendmsg+0x33/0x40
[12236.694396]  [<ffffffff814cb05e>] ? ___sys_sendmsg+0x22e/0x240
[12236.694405]  [<ffffffff814cab75>] ? ___sys_recvmsg+0x135/0x1a0
[12236.694415]  [<ffffffff811a9d12>] ? eventfd_write+0x82/0x210
[12236.694423]  [<ffffffff811a0f9e>] ? fsnotify+0x32e/0x4c0
[12236.694429]  [<ffffffff8108cb70>] ? wake_up_q+0x60/0x60
[12236.694434]  [<ffffffff814cba09>] ? __sys_sendmsg+0x39/0x70
[12236.694440]  [<ffffffff815d4797>] ? entry_SYSCALL_64_fastpath+0x12/0x6a

It seems so far plausible that the recursive call into rtnetlink_rcv()
looks suspicious. One way, where this could trigger is that the senders
NETLINK_CB(skb).portid was wrongly 0 (which is rtnetlink socket), so
the rtnl_getlink() request's answer would be sent to the kernel instead
to the actual user process, thus grabbing rtnl_mutex() twice.

One theory would be that netlink_autobind() triggered via netlink_sendmsg()
internally overwrites the -EBUSY error to 0, but where it is wrongly
originating from __netlink_insert() instead. That would reset the
socket's portid to 0, which is then filled into NETLINK_CB(skb).portid
later on. As commit d470e3b4 ("[NETLINK]: Fix two socket hashing bugs.")
also puts it, -EBUSY should not be propagated from netlink_insert().

It looks like it's very unlikely to reproduce. We need to trigger the
rhashtable_insert_rehash() handler under a situation where rehashing
currently occurs (one /rare/ way would be to hit ht->elasticity limits
while not filled enough to expand the hashtable, but that would rather
require a specifically crafted bind() sequence with knowledge about
destination slots, seems unlikely). It probably makes sense to guard
__netlink_insert() in any case and remap that error. It was suggested
that EOVERFLOW might be better than an already overloaded ENOMEM.

Reference: http://thread.gmane.org/gmane.linux.network/372676Reported-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Acked-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
Acked-by: default avatarThomas Graf <tgraf@suug.ch>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      4e7c1330
    • Ivan Vecera's avatar
      bna: fix interrupts storm caused by erroneous packets · ade4dc3e
      Ivan Vecera authored 
      The commit "e29aa339 bna: Enable Multi Buffer RX" moved packets counter
increment from the beginning of the NAPI processing loop after the check
for erroneous packets so they are never accounted. This counter is used
to inform firmware about number of processed completions (packets).
As these packets are never acked the firmware fires IRQs for them again
and again.

Fixes: e29aa339 ("bna: Enable Multi Buffer RX")
Signed-off-by: default avatarIvan Vecera <ivecera@redhat.com>
Acked-by: default avatarRasesh Mody <rasesh.mody@qlogic.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      ade4dc3e
    • David S. Miller's avatar
      Merge branch 'mvpp2-fixes' · ea708584
      David S. Miller authored 
      Marcin Wojtas says:

====================
Fixes for the network driver of Marvell Armada 375 SoC

This is a set of three patches that fix long-lasting problems implemented in
the initial support for the Armada 375 network controller.

Due to an inappropriate concept of handling the per-CPU sent packets'
processing on TX path the driver numerous problems occured, such as RCU
stalls. Those have been fixed, of which details you can find in the commit
logs. The patches were intensively tested on top of v4.2-rc5.

I'm looking forward to any comments or remarks.
====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      ea708584
    • Marcin Wojtas's avatar
      net: mvpp2: replace TX coalescing interrupts with hrtimer · edc660fa
      Marcin Wojtas authored 
      The PP2 controller is capable of per-CPU TX processing, which means there are
per-CPU banked register sets and queues. Current version of the driver supports
TX packet coalescing - once on given CPU sent packets amount reaches a threshold
value, an IRQ occurs. However, there is a single interrupt line responsible for
CPU0/1 TX and RX events (the latter is not per-CPU, the hardware does not
support RSS).

When the top-half executes the interrupt cause is not known. This is why in
NAPI poll function, along with RX processing, IRQ cause register on both
CPU's is accessed in order to determine on which of them the TX coalescing
threshold might have been reached. Thus the egress processing and releasing the
buffers is able to take place on the corresponding CPU. Hitherto approach lead
to an illegal usage of on_each_cpu function in softirq context.

The problem is solved by resigning from TX coalescing interrupts and separating
egress finalization from NAPI processing. For that purpose a method of using
hrtimer is introduced. In main transmit function (mvpp2_tx) buffers are released
once a software coalescing threshold is reached. In case not all the data is
processed a timer is set on this CPU - in its interrupt context a tasklet is
scheduled in which all queues are processed. At once only one timer per-CPU can
be running, which is controlled by a dedicated flag.

This commit removes TX processing from NAPI polling function, disables hardware
coalescing and enables hrtimer with tasklet, using new per-CPU port structure
(mvpp2_port_pcpu).
Signed-off-by: default avatarMarcin Wojtas <mw@semihalf.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      edc660fa
    • Marcin Wojtas's avatar
      net: mvpp2: enable proper per-CPU TX buffers unmapping · 71ce391d
      Marcin Wojtas authored 
      mvpp2 driver allows usage of per-CPU TX processing. Once the packets are
prepared independetly on each CPU, the hardware enqueues the descriptors in
common TX queue. After they are sent, the buffers and associated sk_buffs
should be released on the corresponding CPU.

This is why a special index is maintained in order to point to the right data to
be released after transmission takes place. Each per-CPU TX queue comprise an
array of sent sk_buffs, freed in mvpp2_txq_bufs_free function. However, the
index was used there also for obtaining a descriptor (and therefore a buffer to
be DMA-unmapped) from common TX queue, which was wrong, because it was not
referring to the current CPU.

This commit enables proper unmapping of sent data buffers by indexing them in
per-CPU queues using a dedicated array for keeping their physical addresses.
Signed-off-by: default avatarMarcin Wojtas <mw@semihalf.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      71ce391d
    • Marcin Wojtas's avatar
      net: mvpp2: remove excessive spinlocks from driver initialization · d53793c5
      Marcin Wojtas authored 
      Using spinlocks protection during one-time driver initialization is not
necessary. Moreover it resulted in invalid GFP_KERNEL allocation under the lock.

This commit removes redundant spinlocks from buffer manager part of mvpp2
initialization.
Signed-off-by: default avatarMarcin Wojtas <mw@semihalf.com>
Reported-by: default avatarAlexandre Fournier <alexandre.fournier@wisp-e.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      d53793c5
  3. 07 Aug, 2015 18 commits
  5. 04 Aug, 2015 6 commits
  7. 03 Aug, 2015 4 commits
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