* Re: Recall: [PATCH] RDSRDMA: Fix cleanup of rds_iw_mr_pool
From: David Miller @ 2011-09-13 18:37 UTC (permalink / raw)
To: jonathan; +Cc: swise, netdev
In-Reply-To: <4E6F9831.8000203@opengridcomputing.com>
From: Jonathan Lallinger <jonathan@opengridcomputing.com>
Date: Tue, 13 Sep 2011 12:51:45 -0500
> I screwed up and submitted the wrong patch, if you could please remove
> this patch from the queue and I will resubmit the correct patch.
Ok, done.
In the future, please always CC: netdev when you are communicating
with me about networking patches.
^ permalink raw reply
* Re: [PATCH] per-cgroup tcp buffer limitation
From: Paul Menage @ 2011-09-13 18:46 UTC (permalink / raw)
To: Glauber Costa
Cc: Greg Thelen, linux-kernel, linux-mm, containers, netdev, xemul,
David S. Miller, Hiroyouki Kamezawa, Eric W. Biederman,
Suleiman Souhlal, Lennart Poettering
In-Reply-To: <4E6F9CC4.2000601@parallels.com>
On Tue, Sep 13, 2011 at 11:11 AM, Glauber Costa <glommer@parallels.com> wrote:
>
> What if they are all updated under the same lock ?
Right, that would be the kind of optimization that would remove the
need for worrying about whether or not to account it. It would
probably mean creating some memcg-specific structures like
res-counters that could handle multiple values, since you'd need to
update both the kernel charge and the total charge, in this cgroup
*and* its ancestors.
Paul
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^ permalink raw reply
* Re: [PATCHv2] ipv6: Create module parameter for use_tempaddr
From: Bjørn Mork @ 2011-09-13 18:39 UTC (permalink / raw)
To: Paul Stewart; +Cc: netdev
In-Reply-To: <20110912212011.7C65B2041D@glenhelen.mtv.corp.google.com>
Paul Stewart <pstew@chromium.org> writes:
> When ipv6 is used as a module, there is no good place to set
> the default value for use_tempaddr. Using sysctl.conf will
> set this parameter too early -- before the module is loaded.
> To solve this, create a module parameter that will set the
> default value of use_tempaddr for all devices.
How is use_tempaddr any different from the other /proc/sys/net/ipv6/*
variables? Do you want to add a module parameter for all of them?
Why can't you run sysctl with an ipv6-specific sysctl.conf at a time
fitting your boot sequence? Or load the ipv6 module before sysctl is
loads the default sysctl.conf if that is what you want? Or just set the
variables in your network configuration scripts, prior to bringing the
interfaces up?
Or do as most people do nowadays: Forget that ipv6 can be built as a
module, and just use it builtin. It's not like it can be unloaded
anyway, so building it as a module does not give you anything.
Bjørn
^ permalink raw reply
* Re: [PATCH] per-cgroup tcp buffer limitation
From: Glauber Costa @ 2011-09-13 19:08 UTC (permalink / raw)
To: Paul Menage
Cc: Greg Thelen, linux-kernel, linux-mm, containers, netdev, xemul,
David S. Miller, Hiroyouki Kamezawa, Eric W. Biederman,
Suleiman Souhlal, Lennart Poettering
In-Reply-To: <CALdu-PDGpBnVHW7E5NobAwtXop5c03NTmijkk8oB7u-a5LEXww@mail.gmail.com>
On 09/13/2011 03:46 PM, Paul Menage wrote:
> On Tue, Sep 13, 2011 at 11:11 AM, Glauber Costa<glommer@parallels.com> wrote:
>>
>> What if they are all updated under the same lock ?
>
> Right, that would be the kind of optimization that would remove the
> need for worrying about whether or not to account it. It would
> probably mean creating some memcg-specific structures like
> res-counters that could handle multiple values, since you'd need to
> update both the kernel charge and the total charge, in this cgroup
> *and* its ancestors.
>
> Paul
If we do that, we may have to commit to an intermediary user interface -
with controls to to determine if kernel memory is billed to kernel or
total, a enable/disable file, just to later render it pointless by a new
optimization - that we seem to agree that seems possible.
I think it is preferred to always assume kernel memory is accounted to
the kernel, and when we optimize it, no changes are made to what's
exposed to userspace.
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^ permalink raw reply
* Re: [PATCH] bridge: mask forwarding of IEEE 802 local multicast groups
From: Benjamin Poirier @ 2011-09-13 19:29 UTC (permalink / raw)
To: Stephen Hemminger
Cc: David Lamparter, Nick Carter, netdev, Michał Mirosław,
davem, Ed Swierk
In-Reply-To: <20110728084106.22166324@nehalam.ftrdhcpuser.net>
On 11-07-28 08:41, Stephen Hemminger wrote:
> On Wed, 27 Jul 2011 13:17:15 +0200
> David Lamparter <equinox@diac24.net> wrote:
>
> > On Fri, Jul 15, 2011 at 06:33:45PM +0200, David Lamparter wrote:
> > > On Fri, Jul 15, 2011 at 06:03:57PM +0200, David Lamparter wrote:
> > > > On Fri, Jul 15, 2011 at 04:44:50PM +0100, Nick Carter wrote:
> > > > > On 12 July 2011 12:36, David Lamparter <equinox@diac24.net> wrote:
> > > > > > On Mon, Jul 11, 2011 at 08:27:55AM -0700, Stephen Hemminger wrote:
> > > > > >> I am still undecided on this. Understand the need, but don't like idea
> > > > > >> of bridge behaving in non-conforming manner. Will see if IEEE 802 committee
> > > > > >> has any input.
> > > > > >
> > > > > > The patch doesn't make the bridge behave nonconformant. The default mask
> > > > > > is 0, which just keeps the old behaviour.
> > >
> > > P.S.: I'd like to once more stress this. In my opinion the patch should
> > > be merged because it provides desireable functionality at a small cost
> > > (one test, one knob) and __does not change any default behaviour__.
> >
> > Stephen, anything new on this?
>
> No.
> Don't like adding yet another hack user visible API which will have
> to be maintained for too long. But on the other hand I don't have
> a better solution at my finger tips. If better idea doesn't come
> along, then we can go with yours.
For virtualization-related problems, how about using macvtap? No need to
change the bridging code.
I had also previously submitted a patch to forward reserved group
addresses through the bridge. This was towards the goal of forwarding
EAPOL frames for virtual machines. I have since come to the realization
that one can use macvtap to achieve that instead. This forgoes the
bridge and offers better performance too.
I have tested macvtap + kvm to authenticate/authorize a virtual machine
connected to a 802.1X enabled switch. I used the instructions here for
macvtap:
http://virt.kernelnewbies.org/MacVTap
and tested with an HP switch and wpa_supplicant on the guest.
-Ben
> --
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^ permalink raw reply
* [PATCH] RDSRDMA: Fix cleanup of rds_iw_mr_pool
From: Jonathan Lallinger @ 2011-09-13 19:41 UTC (permalink / raw)
To: davem, venkat.x.venkatsubra; +Cc: netdev
In the rds_iw_mr_pool struct the free_pinned field keeps track of
memory pinned by free MRs. While this field is incremented properly
upon allocation, it is never decremented upon unmapping. This would
cause the rds_rdma module to crash the kernel upon unloading, by
triggering the BUG_ON in the rds_iw_destroy_mr_pool function.
This change keeps track of the MRs that become unpinned, so that
free_pinned can be decremented appropriately.
Signed-off-by: Jonathan Lallinger <jonathan@ogc.us>
Signed-off-by: Steve Wise <swise@ogc.us>
---
net/rds/iw_rdma.c | 13 +++++++++----
1 files changed, 9 insertions(+), 4 deletions(-)
diff --git a/net/rds/iw_rdma.c b/net/rds/iw_rdma.c
index 7c1c873..050256d 100644
--- a/net/rds/iw_rdma.c
+++ b/net/rds/iw_rdma.c
@@ -84,7 +84,8 @@ static int rds_iw_map_fastreg(struct rds_iw_mr_pool *pool,
static void rds_iw_free_fastreg(struct rds_iw_mr_pool *pool, struct rds_iw_mr *ibmr);
static unsigned int rds_iw_unmap_fastreg_list(struct rds_iw_mr_pool *pool,
struct list_head *unmap_list,
- struct list_head *kill_list);
+ struct list_head *kill_list,
+ int *unpinned);
static void rds_iw_destroy_fastreg(struct rds_iw_mr_pool *pool, struct rds_iw_mr *ibmr);
static int rds_iw_get_device(struct rds_sock *rs, struct rds_iw_device **rds_iwdev, struct rdma_cm_id **cm_id)
@@ -499,7 +500,7 @@ static int rds_iw_flush_mr_pool(struct rds_iw_mr_pool *pool, int free_all)
LIST_HEAD(unmap_list);
LIST_HEAD(kill_list);
unsigned long flags;
- unsigned int nfreed = 0, ncleaned = 0, free_goal;
+ unsigned int nfreed = 0, ncleaned = 0, unpinned = 0, free_goal;
int ret = 0;
rds_iw_stats_inc(s_iw_rdma_mr_pool_flush);
@@ -524,7 +525,8 @@ static int rds_iw_flush_mr_pool(struct rds_iw_mr_pool *pool, int free_all)
* will be destroyed by the unmap function.
*/
if (!list_empty(&unmap_list)) {
- ncleaned = rds_iw_unmap_fastreg_list(pool, &unmap_list, &kill_list);
+ ncleaned = rds_iw_unmap_fastreg_list(pool, &unmap_list,
+ &kill_list, &unpinned);
/* If we've been asked to destroy all MRs, move those
* that were simply cleaned to the kill list */
if (free_all)
@@ -548,6 +550,7 @@ static int rds_iw_flush_mr_pool(struct rds_iw_mr_pool *pool, int free_all)
spin_unlock_irqrestore(&pool->list_lock, flags);
}
+ atomic_sub(unpinned, &poll->free_pinned);
atomic_sub(ncleaned, &pool->dirty_count);
atomic_sub(nfreed, &pool->item_count);
@@ -828,7 +831,8 @@ static void rds_iw_free_fastreg(struct rds_iw_mr_pool *pool,
static unsigned int rds_iw_unmap_fastreg_list(struct rds_iw_mr_pool *pool,
struct list_head *unmap_list,
- struct list_head *kill_list)
+ struct list_head *kill_list,
+ int *unpinned)
{
struct rds_iw_mapping *mapping, *next;
unsigned int ncleaned = 0;
@@ -855,6 +859,7 @@ static unsigned int rds_iw_unmap_fastreg_list(struct rds_iw_mr_pool *pool,
spin_lock_irqsave(&pool->list_lock, flags);
list_for_each_entry_safe(mapping, next, unmap_list, m_list) {
+ *unpinned += mapping->m_sg.len;
list_move(&mapping->m_list, &laundered);
ncleaned++;
}
^ permalink raw reply related
* Re: [PATCHv2] ipv6: Create module parameter for use_tempaddr
From: Paul Stewart @ 2011-09-13 19:56 UTC (permalink / raw)
To: Bjørn Mork; +Cc: netdev
In-Reply-To: <87r53ks2w3.fsf@nemi.mork.no>
On Tue, Sep 13, 2011 at 11:39 AM, Bjørn Mork <bjorn@mork.no> wrote:
> Paul Stewart <pstew@chromium.org> writes:
>
>> When ipv6 is used as a module, there is no good place to set
>> the default value for use_tempaddr. Using sysctl.conf will
>> set this parameter too early -- before the module is loaded.
>> To solve this, create a module parameter that will set the
>> default value of use_tempaddr for all devices.
>
> How is use_tempaddr any different from the other /proc/sys/net/ipv6/*
> variables? Do you want to add a module parameter for all of them?
With use_tempaddr and ipv6 loaded as a module, there is a gap of time
between addrconf starting up and whatever configuration one would use
to set use_tempaddr (you can't use sysctl.conf since module-load time
might be much later). By the time boot scripts (or whatever you'd
use) are able to tweak use_tempaddr, it might be too late and the
global-trackable address (related to the MAC address) might end up in
use. This negates the entire point of use_tempaddr. If any of the
other flags suffer this badly at module-load time, I'd be happy to add
module parameters for them, but this is the only one that I've come to
be aware of.
> Why can't you run sysctl with an ipv6-specific sysctl.conf at a time
> fitting your boot sequence? Or load the ipv6 module before sysctl is
> loads the default sysctl.conf if that is what you want? Or just set the
> variables in your network configuration scripts, prior to bringing the
> interfaces up?
>
> Or do as most people do nowadays: Forget that ipv6 can be built as a
> module, and just use it builtin. It's not like it can be unloaded
> anyway, so building it as a module does not give you anything.
All helpful suggestions. However, I'm not yet willing to accept the
claim that ipv6 cannot be used as a module unless the rest of the
system is painstakingly crafted to close any races between addrconf,
sysctl and other IPv6-using processes. That strikes me as far too
brittle.
--
Paul
^ permalink raw reply
* Re: [PATCHv2] ipv6: Create module parameter for use_tempaddr
From: David Miller @ 2011-09-13 20:04 UTC (permalink / raw)
To: pstew; +Cc: bjorn, netdev
In-Reply-To: <CAMcMvshXgKCpwLFPzUWvmacTuqmSEjDfPgvZU2BHeC+WcXRH0A@mail.gmail.com>
From: Paul Stewart <pstew@chromium.org>
Date: Tue, 13 Sep 2011 12:56:28 -0700
> However, I'm not yet willing to accept the claim that ipv6 cannot be
> used as a module unless the rest of the system is painstakingly
> crafted to close any races between addrconf, sysctl and other
> IPv6-using processes. That strikes me as far too brittle.
Most distributions are moving to building ipv6 statically into the
kernel, largely because of the issues described here.
^ permalink raw reply
* Re: [PATCH net-next 2/2] qlcnic: Change CDRP function
From: Anirban Chakraborty @ 2011-09-13 20:28 UTC (permalink / raw)
To: Joe Perches; +Cc: David Miller, netdev, Dept_NX_Linux_NIC_Driver
In-Reply-To: <1315938171.25776.11.camel@Joe-Laptop>
On Sep 13, 2011, at 11:22 AM, Joe Perches wrote:
> On Tue, 2011-09-13 at 11:06 -0700, Anirban Chakraborty wrote:
>> Argument list to CDRP function has become unmanageably long. Fix it by properly
>> declaring a struct that encompasses all the input and output parameters.
>
> I don't think this is better.
>
> I think you've overloaded the issue_cmd function and should
> use separate issue_cmd_<type> functions instead.
I did not overload issue_cmd(), instead I changed the function signature.
-u32
-qlcnic_issue_cmd(struct qlcnic_adapter *adapter,
- u32 pci_fn, u32 version, u32 arg1, u32 arg2, u32 arg3, u32 cmd,
- u32 *rd_args[3])
+void
+qlcnic_issue_cmd(struct qlcnic_adapter *adapter, struct qlcnic_cmd_args *cmd)
Instead of having a long list of arguments, I put them into a struct and passed it around.
-Anirban
^ permalink raw reply
* bridge should flood non-IPv4-multicast ethernet frames
From: Chuck Anderson @ 2011-09-13 20:00 UTC (permalink / raw)
To: netdev
When the bridge code grew multicast snooping capability (currently
IPv4/IGMPv2-only as I understand it), it stopped flooding non-IPv4
multicast ethernet frames. This breaks the capability to bridge any
non-IPv4 protocols that also use multicast ethernet frames, such as
IPv6 and IS-IS, while the bridge snooping capability remains enabled
(it appears to be default enabled at least in the RHEL 6 vendor
kernel). I noticed this when IPv6 neighbor discovery (ND) and router
advertisement (RA) packets weren't making it to a KVM guest via br0 on
the host, breaking IPv6 connectivity to the guest. This type of thing
is a common bug with vendor's multicast snooping implementations, but
I was surprised to discover that Linux has this same bug. See RFC
4541, section 1, last paragraph, and section 2.1.2, paragraph 4:
http://tools.ietf.org/html/rfc4541.html
I believe the relevent code is in br_device.c:
if (is_broadcast_ether_addr(dest))
br_flood_deliver(br, skb);
else if (is_multicast_ether_addr(dest)) {
if (unlikely(netpoll_tx_running(dev))) {
br_flood_deliver(br, skb);
goto out;
}
if (br_multicast_rcv(br, NULL, skb)) {
kfree_skb(skb);
goto out;
}
mdst = br_mdb_get(br, skb);
if (mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb))
br_multicast_deliver(mdst, skb);
else
br_flood_deliver(br, skb);
} else if ((dst = __br_fdb_get(br, dest)) != NULL)
br_deliver(dst->dst, skb);
else
br_flood_deliver(br, skb);
is_multicast_ether_addr() only checks to see if the lowest bit is
1--i.e. any multicast ethernet address. That check alone isn't
sufficient. There also needs to be a check that the ethernet frame is
in one of the well-known formats for the particular protocol for which
snooping is supported, IPv4 being the only one supported by Linux
bridging so far.
I see a few ways to fix this:
1. IPv4 Multicast always uses multicast ethernet addresses in the
format 01:00:5E:xx:xx:xx. Insert a check that the dest address
matches 01:00:5E:xx:xx:xx, otherwise always flood the frame so we
don't break non-IPv4-multicast frames from being bridged. Something
like this pseudocode:
if (is_broadcast_ether_addr(dest))
br_flood_deliver(br, skb);
else if (is_ipv4_multicast_ether_addr(dest)) {
...
static inline int is_ipv4_multicast_ether_addr(const u8 *addr)
{
return (addr[0] == 0x01 && addr[1] == 0x00 && addr[2] == 0x5e);
}
2. Check that the Ethertype is 0x800 (IPv4), and if it is not, always
flood the frame so we don't break non-IPv6-multicast frames being
bridged.
3. Do both of the above, the key point being that IPv6 multicast
frames (33:33:xx:xx:xx:xx), along with any other ethernet multicast
frames that aren't supported by the current bridge snooping code,
should always be flooded unconditionally. IS-IS for example uses
01:80:C2:00:00:14 and 01:80:C2:00:00:15.
Thoughts?
^ permalink raw reply
* Re: [PATCH net-next 2/2] qlcnic: Change CDRP function
From: Joe Perches @ 2011-09-13 20:56 UTC (permalink / raw)
To: Anirban Chakraborty; +Cc: David Miller, netdev, Dept_NX_Linux_NIC_Driver
In-Reply-To: <33055D09-742C-4751-9A4B-1AF11ED34E31@qlogic.com>
On Tue, 2011-09-13 at 13:28 -0700, Anirban Chakraborty wrote:
> On Sep 13, 2011, at 11:22 AM, Joe Perches wrote:
> > On Tue, 2011-09-13 at 11:06 -0700, Anirban Chakraborty wrote:
> >> Argument list to CDRP function has become unmanageably long. Fix it by properly
> >> declaring a struct that encompasses all the input and output parameters.
> > I don't think this is better.
> > I think you've overloaded the issue_cmd function and should
> > use separate issue_cmd_<type> functions instead.
> I did not overload issue_cmd(), instead I changed the function signature.
> -u32
> -qlcnic_issue_cmd(struct qlcnic_adapter *adapter,
> - u32 pci_fn, u32 version, u32 arg1, u32 arg2, u32 arg3, u32 cmd,
> - u32 *rd_args[3])
> +void
> +qlcnic_issue_cmd(struct qlcnic_adapter *adapter, struct qlcnic_cmd_args *cmd)
> Instead of having a long list of arguments, I put them into a struct and passed it around.
Yes, I saw that.
I think that if restructuring is done, perhaps there are
better alternatives to bundling all the arguments into a
single struct.
I think it might be more sensible to have multiple
issue_cmd_<cmd>(adapter, [appropriate_args]) functions
instead so that the arguments and returns are appropriate
for the cmd performed.
or maybe use
issue_cmd(adapter, cmd, struct)
so you make cmd explicit and it's a bit easier to read
if you really must use some struct where cmd doesn't
use all the elements of struct.
^ permalink raw reply
* Re: bridge should flood non-IPv4-multicast ethernet frames
From: Stephen Hemminger @ 2011-09-13 21:14 UTC (permalink / raw)
To: Chuck Anderson; +Cc: netdev
In-Reply-To: <20110913200027.GQ28007@angus.ind.WPI.EDU>
On Tue, 13 Sep 2011 16:00:27 -0400
Chuck Anderson <cra@WPI.EDU> wrote:
> 2. Check that the Ethertype is 0x800 (IPv4), and if it is not, always
> flood the frame so we don't break non-IPv6-multicast frames being
> bridged.
Doing something based on Ether type is the correct solution.
It should handle ipv4 and ipv6 snooping and flood all other types.
^ permalink raw reply
* Re: [PATCH net-next 2/2] qlcnic: Change CDRP function
From: Anirban Chakraborty @ 2011-09-13 21:15 UTC (permalink / raw)
To: Joe Perches; +Cc: David Miller, netdev, Dept_NX_Linux_NIC_Driver
In-Reply-To: <1315947384.25776.30.camel@Joe-Laptop>
On Sep 13, 2011, at 1:56 PM, Joe Perches wrote:
> On Tue, 2011-09-13 at 13:28 -0700, Anirban Chakraborty wrote:
>> On Sep 13, 2011, at 11:22 AM, Joe Perches wrote:
>>> On Tue, 2011-09-13 at 11:06 -0700, Anirban Chakraborty wrote:
>>>> Argument list to CDRP function has become unmanageably long. Fix it by properly
>>>> declaring a struct that encompasses all the input and output parameters.
>>> I don't think this is better.
>>> I think you've overloaded the issue_cmd function and should
>>> use separate issue_cmd_<type> functions instead.
>> I did not overload issue_cmd(), instead I changed the function signature.
>> -u32
>> -qlcnic_issue_cmd(struct qlcnic_adapter *adapter,
>> - u32 pci_fn, u32 version, u32 arg1, u32 arg2, u32 arg3, u32 cmd,
>> - u32 *rd_args[3])
>> +void
>> +qlcnic_issue_cmd(struct qlcnic_adapter *adapter, struct qlcnic_cmd_args *cmd)
>> Instead of having a long list of arguments, I put them into a struct and passed it around.
>
> Yes, I saw that.
>
> I think that if restructuring is done, perhaps there are
> better alternatives to bundling all the arguments into a
> single struct.
>
> I think it might be more sensible to have multiple
> issue_cmd_<cmd>(adapter, [appropriate_args]) functions
> instead so that the arguments and returns are appropriate
> for the cmd performed.
>
> or maybe use
>
> issue_cmd(adapter, cmd, struct)
>
> so you make cmd explicit and it's a bit easier to read
> if you really must use some struct where cmd doesn't
> use all the elements of struct.
The usage of issue_cmd() here is to send a message to the FW. In some cases, the caller
of the function may want to read additional data right after the FW cmd is executed and in some
cases it doesn't. As you mentioned, one way to do is to use two different issue_cmd()s. However,
we find it easier to use a single issue_cmd(), where the caller indicates whether it needs additional
data by setting the parameters in the argument.
Thank you for your feedback.
-Anirban
^ permalink raw reply
* Your Mail Quota Has Exceeded
From: Mail Administrator @ 2011-09-13 21:27 UTC (permalink / raw)
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^ permalink raw reply
* (unknown),
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^ permalink raw reply
* Re: [PATCH] ixgbe: drop zero length frame segments during a packet split rx
From: Jeff Kirsher @ 2011-09-13 22:52 UTC (permalink / raw)
To: Neil Horman
Cc: netdev@vger.kernel.org, Thadeu Lima de Souza Cascardo,
Brandeburg, Jesse, Duyck, Alexander H, Fastabend, John R,
David S. Miller
In-Reply-To: <20110913105003.GA16222@hmsreliant.think-freely.org>
[-- Attachment #1: Type: text/plain, Size: 3769 bytes --]
On Tue, 2011-09-13 at 03:50 -0700, Neil Horman wrote:
> On Fri, Sep 02, 2011 at 10:03:17AM -0400, Neil Horman wrote:
> > This oops was reported recently no ppc64 hardware:
> > Unable to handle kernel paging request for data at address 0x00000000
> > Faulting instruction address: 0xc0000000004dda0c
> > Oops: Kernel access of bad area, sig: 11 [#1]
> > SMP NR_CPUS=1024 NUMA pSeries
> > Modules linked in: sunrpc ipt_REJECT nf_conntrack_ipv4 nf_defrag_ipv4
> > iptable_fi
> > lter ip_tables ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 xt_state
> > nf_conntrack ip6table_filter ip6_tables ipv6 jsm ses enclosure sg ixgbe
> > mdio e1000 ehea ext4 jbd2 mbcache sd_mod crc_t10dif ipr dm_mod
> > NIP: c0000000004dda0c LR: c0000000004e3e50 CTR: c0000000004e3e20
> > REGS: c0000001bffeb8d0 TRAP: 0300 Not tainted (3.1.0-rc2-10121-gab7e2db)
> > MSR: 8000000000009032 <EE,ME,IR,DR> CR: 28002042 XER: 20000000
> > CFAR: c000000000004d70
> > DAR: 0000000000000000, DSISR: 40000000
> > TASK = c000000000d548e0[0] 'swapper' THREAD: c000000000dfc000 CPU: 0
> > GPR04: c0000000010f4d80 c0000001bffebd80 0000000000000000 c0000001b18a8200
> > GPR08: 0000000000000280 c0000001bcc517a8 c0000001b18a7f80 0000000000000000
> > GPR12: d0000000047e5bb0 c000000001f10000 c0000001b19c8700 0000000000000000
> > GPR16: c0000001bffebd80 0000000000000083 c00000018f2447a0 0000000000000002
> > GPR20: 0000000000000000 c0000001ba860010 c0000001ba860000 d000000003d40000
> > GPR24: 0000000000000000 0000000000000083 d000000003d40000 0000000000000001
> > GPR28: c00000018f244780 c0000001b2b94310 c000000000da95f0 c0000001bcc51780
> > NIP [c0000000004dda0c] .skb_gro_reset_offset+0x5c/0xe0
> > LR [c0000000004e3e50] .napi_gro_receive+0x30/0x120
> > Call Trace:
> > [c0000001bffebb50] [c000000000da95f0] perf_callchain_user+0x0/0x10 (unreliable)
> > [c0000001bffebbf0] [d0000000047bd118] .ixgbe_clean_rx_irq+0x7a8/0x8a0 [ixgbe]
> > [c0000001bffebd10] [d0000000047bd414] .ixgbe_poll+0x64/0x160 [ixgbe]
> > [c0000001bffebdd0] [c0000000004e3358] .net_rx_action+0x108/0x2a0
> > [c0000001bffebea0] [c00000000009b220] .__do_softirq+0x110/0x2a0
> > [c0000001bffebf90] [c000000000023798] .call_do_softirq+0x14/0x24
> > [c000000000dff830] [c000000000011148] .do_softirq+0xf8/0x130
> > [c000000000dff8d0] [c00000000009aeb4] .irq_exit+0xb4/0xc0
> > [c000000000dff950] [c000000000011254] .do_IRQ+0xd4/0x300
> > [c000000000dffa10] [c000000000005024] hardware_interrupt_entry+0x18/0x74
> > --- Exception: 501 at .pseries_dedicated_idle_sleep+0xe4/0x210
> > LR = .pseries_dedicated_idle_sleep+0x8c/0x210
> > [c000000000dffd00] [c00000000005b194] .pseries_dedicated_idle_sleep+0x194/0x210
> > (unreliable)
> > [c000000000dffdc0] [c000000000018c84] .cpu_idle+0x164/0x210
> > [c000000000dffe70] [c00000000000b0d0] .rest_init+0x90/0xb0
> > [c000000000dffef0] [c000000000830bc0] .start_kernel+0x54c/0x56c
> > [c000000000dfff90] [c00000000000953c] .start_here_common+0x1c/0x60
> >
> > Its caused when skb_gro_reset_offset attempts to call PageHighMem on
> > skb_shinfo(skb)->frags[0].page, when the frags array was left uninitalized.
> > This can happen in the ixgbe driver if the hardware reports a zero length rx
> > descriptor ni the middle of a packet split receive transaction. I've consulted
> > with Jesse Brandeburg on this, who is attempting to root cause the issue at
> > Intel, but it seems prudent to add this check to the driver to discard frames of
> > that encounter this error to avoid the opps
> >
> Sorry, I need to rescind this patch. Looks like this is turning out to be an
> issue with an ideosyncracy in the dma hardware on this platform.
>
> Thanks
> Neil
>
Thanks for the update Neil. I have dropped the patch from my queue.
[-- Attachment #2: This is a digitally signed message part --]
[-- Type: application/pgp-signature, Size: 490 bytes --]
^ permalink raw reply
* Re: [PATCH 2/3] netdev/of/phy: Add MDIO bus multiplexer support.
From: Kumar Gala @ 2011-09-13 23:07 UTC (permalink / raw)
To: David Daney
Cc: linux-mips-6z/3iImG2C8G8FEW9MqTrA, netdev-u79uwXL29TY76Z2rM5mHXA,
devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ,
linux-kernel-u79uwXL29TY76Z2rM5mHXA, ralf-6z/3iImG2C8G8FEW9MqTrA,
David S. Miller
In-Reply-To: <1314820906-14004-3-git-send-email-david.daney-YGCgFSpz5w/QT0dZR+AlfA@public.gmane.org>
> diff --git a/Documentation/devicetree/bindings/net/mdio-mux.txt b/Documentation/devicetree/bindings/net/mdio-mux.txt
> new file mode 100644
> index 0000000..a908312
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/mdio-mux.txt
> @@ -0,0 +1,132 @@
> +Common MDIO bus multiplexer/switch properties.
> +
> +An MDIO bus multiplexer/switch will have several child busses that are
> +numbered uniquely in a device dependent manner. The nodes for an MDIO
> +bus multiplexer/switch will have one child node for each child bus.
> +
> +Required properties:
> +- parent-bus : phandle to the parent MDIO bus.
Should probably be mdio-parent-bus
> +
> +Optional properties:
> +- Other properties specific to the multiplexer/switch hardware.
> +
> +Required properties for child nodes:
> +- #address-cells = <1>;
> +- #size-cells = <0>;
> +- cell-index : The sub-bus number.
What does sub-bus number mean?
> +
> +
> +Example :
[snip]
> diff --git a/drivers/net/phy/mdio-mux.c b/drivers/net/phy/mdio-mux.c
> new file mode 100644
> index 0000000..f9c5826
> --- /dev/null
> +++ b/drivers/net/phy/mdio-mux.c
> @@ -0,0 +1,182 @@
> +/*
> + * This file is subject to the terms and conditions of the GNU General Public
> + * License. See the file "COPYING" in the main directory of this archive
> + * for more details.
> + *
> + * Copyright (C) 2011 Cavium Networks
> + */
> +
> +#include <linux/platform_device.h>
> +#include <linux/of_mdio.h>
> +#include <linux/module.h>
> +#include <linux/init.h>
> +#include <linux/gfp.h>
> +#include <linux/phy.h>
> +#include <linux/mdio-mux.h>
> +
> +#define DRV_VERSION "1.0"
> +#define DRV_DESCRIPTION "MDIO bus multiplexer driver"
> +
> +struct mdio_mux_parent_bus {
> + struct mii_bus *mii_bus;
> + int current_child;
> + int parent_id;
> + void *switch_data;
> + int (*switch_fn)(int current_child, int desired_child, void *data);
> +};
> +
> +struct mdio_mux_child_bus {
> + struct mii_bus *mii_bus;
> + struct mdio_mux_parent_bus *parent;
> + int bus_number;
> + int phy_irq[PHY_MAX_ADDR];
> +};
> +
> +/*
> + * The parent bus' lock is used to order access to the switch_fn.
> + */
> +static int mdio_mux_read(struct mii_bus *bus, int phy_id, int regnum)
> +{
> + struct mdio_mux_child_bus *cb = bus->priv;
> + struct mdio_mux_parent_bus *pb = cb->parent;
> + int r;
> +
> + mutex_lock(&pb->mii_bus->mdio_lock);
> + r = pb->switch_fn(pb->current_child, cb->bus_number, pb->switch_data);
> + if (r)
> + goto out;
> +
> + pb->current_child = cb->bus_number;
> +
> + r = pb->mii_bus->read(pb->mii_bus, phy_id, regnum);
> +out:
> + mutex_unlock(&pb->mii_bus->mdio_lock);
> +
> + return r;
> +}
> +
> +/*
> + * The parent bus' lock is used to order access to the switch_fn.
> + */
> +static int mdio_mux_write(struct mii_bus *bus, int phy_id,
> + int regnum, u16 val)
> +{
> + struct mdio_mux_child_bus *cb = bus->priv;
> + struct mdio_mux_parent_bus *pb = cb->parent;
> +
> + int r;
> +
> + mutex_lock(&pb->mii_bus->mdio_lock);
> + r = pb->switch_fn(pb->current_child, cb->bus_number, pb->switch_data);
> + if (r)
> + goto out;
> +
> + pb->current_child = cb->bus_number;
> +
> + r = pb->mii_bus->write(pb->mii_bus, phy_id, regnum, val);
> +out:
> + mutex_unlock(&pb->mii_bus->mdio_lock);
> +
> + return r;
> +}
> +
> +static int parent_count;
> +
> +int mdio_mux_probe(struct platform_device *pdev,
> + int (*switch_fn)(int cur, int desired, void *data),
> + void *data)
> +{
> + struct device_node *parent_bus_node;
> + struct device_node *child_bus_node;
> + int r, n, ret_val;
> + struct mii_bus *parent_bus;
> + struct mdio_mux_parent_bus *pb;
> + struct mdio_mux_child_bus *cb;
> +
> + if (!pdev->dev.of_node)
> + return -ENODEV;
> +
> + parent_bus_node = of_parse_phandle(pdev->dev.of_node, "parent-bus", 0);
> +
> + if (!parent_bus_node)
> + return -ENODEV;
> +
> + parent_bus = of_mdio_find_bus(parent_bus_node);
So what happens if the parent bus probe happens after the mux probe?
> +
> + pb = devm_kzalloc(&pdev->dev, sizeof(*pb), GFP_KERNEL);
> + if (pb == NULL) {
> + ret_val = -ENOMEM;
> + goto err_parent_bus;
> + }
> +
> + pb->switch_data = data;
> + pb->switch_fn = switch_fn;
> + pb->current_child = -1;
> + pb->parent_id = parent_count++;
> + pb->mii_bus = parent_bus;
> +
> + n = 0;
> + for_each_child_of_node(pdev->dev.of_node, child_bus_node) {
> + u32 v;
> +
> + r = of_property_read_u32(child_bus_node, "cell-index", &v);
> + if (r == 0) {
> + cb = devm_kzalloc(&pdev->dev, sizeof(*cb), GFP_KERNEL);
> + if (cb == NULL)
> + break;
> + cb->bus_number = v;
> + cb->parent = pb;
> + cb->mii_bus = mdiobus_alloc();
> + cb->mii_bus->priv = cb;
> +
> + cb->mii_bus->irq = cb->phy_irq;
> + cb->mii_bus->name = "mdio_mux";
> + snprintf(cb->mii_bus->id, MII_BUS_ID_SIZE, "%x.%x",
> + pb->parent_id, v);
> + cb->mii_bus->parent = &pdev->dev;
> + cb->mii_bus->read = mdio_mux_read;
> + cb->mii_bus->write = mdio_mux_write;
> + r = of_mdiobus_register(cb->mii_bus, child_bus_node);
> + if (r) {
> + of_node_put(child_bus_node);
> + devm_kfree(&pdev->dev, cb);
> + } else {
> + n++;
> + }
> +
> + } else {
> + of_node_put(child_bus_node);
> + }
> + }
> + if (n) {
> + dev_info(&pdev->dev, "Version " DRV_VERSION "\n");
> + return 0;
> + }
> + ret_val = -ENOMEM;
> + devm_kfree(&pdev->dev, pb);
> +err_parent_bus:
> + of_node_put(parent_bus_node);
> + return ret_val;
> +}
> +EXPORT_SYMBOL(mdio_mux_probe);
> +
> +static int __devexit mdio_mux_remove(struct platform_device *pdev)
> +{
> + return 0;
> +}
> +
> +static int __init mdio_mux_mod_init(void)
> +{
> + return 0;
> +}
> +module_init(mdio_mux_mod_init);
> +
> +static void __exit mdio_mux_mod_exit(void)
> +{
> +}
> +module_exit(mdio_mux_mod_exit);
> +
> +MODULE_DESCRIPTION(DRV_DESCRIPTION);
> +MODULE_VERSION(DRV_VERSION);
> +MODULE_AUTHOR("David Daney");
> +MODULE_LICENSE("GPL");
^ permalink raw reply
* Query on a lockdep issue in neigh_lookup
From: Murali raja Muniraju @ 2011-09-13 23:11 UTC (permalink / raw)
To: netdev
Hi,
I see a potential deadlock situation on the kernel 2.6.34. Has this
been fixed in the later version of the kernel.
I see that one after holding the neigh_lookup, one can acquire the
lock for rt_hash_locks
But there is a situation while freed skb's in dst_release while
holding the rt_hash_locks, neigh_lookup can be called which tries to
acquire its lock.
This seems to be a deadlock candidate.
Thanks,
Murali
Below if the scenario found by lockdep on a debug kernel during the
kernel bootup.
[ 92.245713] =======================================================
[ 92.246640] [ INFO: possible circular locking dependency detected ]
[ 92.246640] 2.6.34-dbg-2011082906 #1
[ 92.246640] -------------------------------------------------------
[ 92.246640] swapper/0 is trying to acquire lock:
[ 92.246640] (&tbl->lock){++--..}, at: [<ffffffff81553a22>]
neigh_lookup+0x42/0xd0
[ 92.246640]
[ 92.246640] but task is already holding lock:
[ 92.246640] (&(&rt_hash_locks[i])->rlock){+.-...}, at:
[<ffffffff815798e0>] rt_intern_hash+0xd0/0x880
[ 92.246640]
[ 92.246640] which lock already depends on the new lock.
[ 92.246640]
[ 92.246640]
[ 92.246640] the existing dependency chain (in reverse order) is:
[ 92.246640]
[ 92.246640] -> #2 (&(&rt_hash_locks[i])->rlock){+.-...}:
[ 92.246640] [<ffffffff810e7700>] __lock_acquire+0xe30/0x1190
[ 92.246640] [<ffffffff810e7af3>] lock_acquire+0x93/0x120
[ 92.246640] [<ffffffff815ed266>] _raw_spin_lock_bh+0x36/0x50
[ 92.246640] [<ffffffff81576a26>] rt_dst_release+0x66/0xc0
[ 92.246640] [<ffffffff8155194c>] dst_release+0x5c/0x90
[ 92.246640] [<ffffffff8153aef5>] skb_release_head_state+0x95/0xd0
[ 92.246640] [<ffffffff8153ad06>] __kfree_skb+0x16/0xa0
[ 92.246640] [<ffffffff8153ae12>] kfree_skb+0x42/0x90
[ 92.246640] [<ffffffff81552fae>] __neigh_event_send+0x11e/0x1d0
[ 92.246640] [<ffffffff81553193>] neigh_resolve_output+0x133/0x2f0
[ 92.246640] [<ffffffff81584742>] ip_output+0x2c2/0x3a0
[ 92.246640] [<ffffffff8158291d>] ip_local_out+0xad/0xc0
[ 92.246640] [<ffffffff81582cc0>] ip_send_reply+0x290/0x340
[ 92.246640] [<ffffffff815a3ba1>] tcp_v4_send_reset+0x1a1/0x310
[ 92.246640] [<ffffffff815a7b04>] tcp_v4_rcv+0x314/0x9b0
[ 92.246640] [<ffffffff8157e344>] ip_local_deliver_finish+0xf4/0x200
[ 92.246640] [<ffffffff8157e4e0>] ip_local_deliver+0x90/0xa0
[ 92.246640] [<ffffffff8157dbf1>] ip_rcv_finish+0x111/0x460
[ 92.246640] [<ffffffff8157e17d>] ip_rcv+0x23d/0x310
[ 92.246640] [<ffffffff81549144>] __netif_receive_skb+0x2d4/0x570
[ 92.246640] [<ffffffff81549620>] netif_receive_skb+0xb0/0xc0
[ 92.246640] [<ffffffff81549d28>] napi_gro_receive+0x148/0x180
[ 92.246640] [<ffffffffa0066aba>]
e1000_clean_rx_irq+0x2ba/0x470 [e1000e]
[ 92.246640] [<ffffffffa006567f>] e1000_clean+0x7f/0x280 [e1000e]
[ 92.246640] [<ffffffff8154b200>] net_rx_action+0x170/0x4f0
[ 92.246640] [<ffffffff810a8ec7>] __do_softirq+0x127/0x2b0
[ 92.246640] [<ffffffff8104514c>] call_softirq+0x1c/0x50
[ 92.246640] [<ffffffff810472dd>] do_softirq+0x7d/0xb0
[ 92.246640] [<ffffffff810a8cd5>] irq_exit+0xa5/0xb0
[ 92.246640] [<ffffffff815f5555>] do_IRQ+0x75/0xf0
[ 92.246640] [<ffffffff815edb13>] ret_from_intr+0x0/0xf
[ 92.510442] [<ffffffff815ed7d3>] _raw_spin_unlock+0x23/0x40
[ 92.510442] [<ffffffff811b1d03>] sys_close+0xc3/0x160
[ 92.510442] [<ffffffff8107d0e7>] sysenter_dispatch+0x7/0x2c
[ 92.510442]
[ 92.510442] -> #1 (&n->lock){++--..}:
[ 92.510442] [<ffffffff810e7700>] __lock_acquire+0xe30/0x1190
[ 92.510442] [<ffffffff810e7af3>] lock_acquire+0x93/0x120
[ 92.510442] [<ffffffff815ed3b1>] _raw_write_lock+0x31/0x40
[ 92.510442] [<ffffffff81556b90>] neigh_periodic_work+0xa0/0x4a0
[ 92.510442] [<ffffffff810c274c>] worker_thread+0x1cc/0x330
[ 92.510442] [<ffffffff810c7de6>] kthread+0x96/0xa0
[ 92.510442] [<ffffffff81045054>] kernel_thread_helper+0x4/0x10
[ 92.510442]
[ 92.510442] -> #0 (&tbl->lock){++--..}:
[ 92.510442] [<ffffffff810e7a5e>] __lock_acquire+0x118e/0x1190
[ 92.510442] [<ffffffff810e7af3>] lock_acquire+0x93/0x120
[ 92.510442] [<ffffffff815ed569>] _raw_read_lock_bh+0x39/0x50
[ 92.510442] [<ffffffff81553a22>] neigh_lookup+0x42/0xd0
[ 92.510442] [<ffffffff815b1ce9>] arp_bind_neighbour+0x79/0xb0
[ 92.510442] [<ffffffff815799a2>] rt_intern_hash+0x192/0x880
[ 92.510442] [<ffffffff8157bb3c>] ip_route_output_slow+0x47c/0xa50
[ 92.510442] [<ffffffff8157c53f>] __ip_route_output_key+0x5f/0x250
[ 92.510442] [<ffffffff8157c7c1>] ip_route_output_key+0x21/0x70
[ 92.510442] [<ffffffff815b3a28>] arp_process+0x7f8/0x970
[ 92.510442] [<ffffffff815b3cb1>] arp_rcv+0x111/0x140
[ 92.510442] [<ffffffff81549144>] __netif_receive_skb+0x2d4/0x570
[ 92.510442] [<ffffffff81549620>] netif_receive_skb+0xb0/0xc0
[ 92.510442] [<ffffffff81549d28>] napi_gro_receive+0x148/0x180
[ 92.510442] [<ffffffffa0066aba>]
e1000_clean_rx_irq+0x2ba/0x470 [e1000e]
[ 92.510442] [<ffffffffa006567f>] e1000_clean+0x7f/0x280 [e1000e]
[ 92.510442] [<ffffffff8154b200>] net_rx_action+0x170/0x4f0
[ 92.510442] [<ffffffff810a8ec7>] __do_softirq+0x127/0x2b0
[ 92.510442] [<ffffffff8104514c>] call_softirq+0x1c/0x50
[ 92.510442] [<ffffffff810472dd>] do_softirq+0x7d/0xb0
[ 92.510442] [<ffffffff810a8cd5>] irq_exit+0xa5/0xb0
[ 92.510442] [<ffffffff815f5555>] do_IRQ+0x75/0xf0
[ 92.510442] [<ffffffff815edb13>] ret_from_intr+0x0/0xf
[ 92.510442] [<ffffffff81043125>] cpu_idle+0x95/0x150
[ 92.510442] [<ffffffff81b924e1>] start_secondary+0x1d1/0x1d5
[ 92.510442]
[ 92.510442] other info that might help us debug this:
[ 92.510442]
[ 92.742983] 4 locks held by swapper/0:
[ 92.742983] #0: (rcu_read_lock){.+.+.+}, at:
[<ffffffff8154b17e>] net_rx_action+0xee/0x4f0
[ 92.742983] #1: (&(&napi->poll_lock)->rlock){+.-...}, at:
[<ffffffff8154b1d6>] net_rx_action+0x146/0x4f0
[ 92.742983] #2: (rcu_read_lock){.+.+.+}, at:
[<ffffffff81548ff0>] __netif_receive_skb+0x180/0x570
[ 92.742983] #3: (&(&rt_hash_locks[i])->rlock){+.-...}, at:
[<ffffffff815798e0>] rt_intern_hash+0xd0/0x880
[ 92.742983]
[ 92.742983] stack backtrace:
[ 92.742983] Pid: 0, comm: swapper Not tainted 2.6.34-dbg-2011082906 #1
[ 92.742983] Call Trace:
[ 92.742983] <IRQ> [<ffffffff810e40b9>] print_circular_bug+0xe9/0xf0
[ 92.742983] [<ffffffff810e7a5e>] __lock_acquire+0x118e/0x1190
[ 92.742983] [<ffffffff810e7af3>] lock_acquire+0x93/0x120
[ 92.742983] [<ffffffff81553a22>] ? neigh_lookup+0x42/0xd0
[ 92.742983] [<ffffffff815ed569>] _raw_read_lock_bh+0x39/0x50
[ 92.742983] [<ffffffff81553a22>] ? neigh_lookup+0x42/0xd0
[ 92.742983] [<ffffffff81553a22>] neigh_lookup+0x42/0xd0
[ 92.742983] [<ffffffff815b1ce9>] arp_bind_neighbour+0x79/0xb0
[ 92.742983] [<ffffffff815798e0>] ? rt_intern_hash+0xd0/0x880
[ 92.742983] [<ffffffff815799a2>] rt_intern_hash+0x192/0x880
[ 92.742983] [<ffffffff8157bb3c>] ip_route_output_slow+0x47c/0xa50
[ 92.742983] [<ffffffff8157b961>] ? ip_route_output_slow+0x2a1/0xa50
[ 92.742983] [<ffffffff8157c53f>] __ip_route_output_key+0x5f/0x250
[ 92.742983] [<ffffffff8157c560>] ? __ip_route_output_key+0x80/0x250
[ 92.742983] [<ffffffff8157c7c1>] ip_route_output_key+0x21/0x70
[ 92.742983] [<ffffffff815b3a28>] arp_process+0x7f8/0x970
[ 92.742983] [<ffffffff815b3230>] ? arp_process+0x0/0x970
[ 92.742983] [<ffffffff815b3cb1>] arp_rcv+0x111/0x140
[ 92.742983] [<ffffffff81549144>] __netif_receive_skb+0x2d4/0x570
[ 92.742983] [<ffffffff81548ff0>] ? __netif_receive_skb+0x180/0x570
[ 92.742983] [<ffffffff811ab25d>] ? __kmalloc_node_track_caller+0x7d/0x100
[ 92.742983] [<ffffffff811a88d0>] ? kmem_cache_alloc_node+0x0/0x280
[ 92.742983] [<ffffffff81549620>] netif_receive_skb+0xb0/0xc0
[ 92.742983] [<ffffffff81549570>] ? netif_receive_skb+0x0/0xc0
[ 92.742983] [<ffffffff8153981f>] ? __alloc_skb+0x8f/0x1a0
[ 92.742983] [<ffffffff81549d28>] napi_gro_receive+0x148/0x180
[ 92.742983] [<ffffffffa0066aba>] e1000_clean_rx_irq+0x2ba/0x470 [e1000e]
[ 92.742983] [<ffffffffa006567f>] e1000_clean+0x7f/0x280 [e1000e]
[ 92.742983] [<ffffffff8154b200>] net_rx_action+0x170/0x4f0
[ 92.742983] [<ffffffff8154b17e>] ? net_rx_action+0xee/0x4f0
[ 92.742983] [<ffffffff810a8e71>] ? __do_softirq+0xd1/0x2b0
[ 92.742983] [<ffffffff810a8ec7>] __do_softirq+0x127/0x2b0
[ 92.742983] [<ffffffff8104514c>] call_softirq+0x1c/0x50
[ 92.742983] [<ffffffff810472dd>] do_softirq+0x7d/0xb0
[ 92.742983] [<ffffffff810a8cd5>] irq_exit+0xa5/0xb0
[ 92.742983] [<ffffffff815f5555>] do_IRQ+0x75/0xf0
[ 93.005851] [<ffffffff815edb13>] ret_from_intr+0x0/0xf
[ 93.005851] <EOI> [<ffffffff8104d737>] ? mwait_idle+0x77/0xd0
[ 93.005851] [<ffffffff8104d72e>] ? mwait_idle+0x6e/0xd0
[ 93.005851] [<ffffffff81043125>] cpu_idle+0x95/0x150
[ 93.005851] [<ffffffff81b924e1>] start_secondary+0x1d1/0x1d5
--
__MURALI__
^ permalink raw reply
* Re: [PATCH 2/3] netdev/of/phy: Add MDIO bus multiplexer support.
From: David Daney @ 2011-09-13 23:23 UTC (permalink / raw)
To: Kumar Gala, grant.likely-s3s/WqlpOiPyB63q8FvJNQ
Cc: linux-mips-6z/3iImG2C8G8FEW9MqTrA, netdev-u79uwXL29TY76Z2rM5mHXA,
devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ,
linux-kernel-u79uwXL29TY76Z2rM5mHXA, ralf-6z/3iImG2C8G8FEW9MqTrA,
David S. Miller
In-Reply-To: <129FAAB3-C9AD-43F6-A8CB-96548A47C4DC-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>
On 09/13/2011 04:07 PM, Kumar Gala wrote:
>
>> diff --git a/Documentation/devicetree/bindings/net/mdio-mux.txt b/Documentation/devicetree/bindings/net/mdio-mux.txt
>> new file mode 100644
>> index 0000000..a908312
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/net/mdio-mux.txt
>> @@ -0,0 +1,132 @@
>> +Common MDIO bus multiplexer/switch properties.
>> +
>> +An MDIO bus multiplexer/switch will have several child busses that are
>> +numbered uniquely in a device dependent manner. The nodes for an MDIO
>> +bus multiplexer/switch will have one child node for each child bus.
>> +
>> +Required properties:
>> +- parent-bus : phandle to the parent MDIO bus.
>
> Should probably be mdio-parent-bus
Why? We know it is MDIO.
Serial bus multiplexing is not a concept limited to MDIO. We would want
to use "parent-bus" for some I2C multiplexers as well.
>
>> +
>> +Optional properties:
>> +- Other properties specific to the multiplexer/switch hardware.
>> +
>> +Required properties for child nodes:
>> +- #address-cells =<1>;
>> +- #size-cells =<0>;
>> +- cell-index : The sub-bus number.
>
> What does sub-bus number mean?
There are N child buses (or sub-buses) coming out of the multiplexer.
The cell-index is used as a handle or identifier for each of these.
The concrete example in Patch 3/3 is a multiplexer with four child
buses. The happen to have cell-indexes of 0, 1, 2 and 3.
In the GPIO case of patch 3/3, these directly correspond the the state
of the two GPIO pins controlling the multiplexer. The driver then uses
the cell-index property to determine the state of the GPIO to connect
any given child.
It is possible that the documentation part of the patch could be made
more clear about this.
>
>> +
>> +
>> +Example :
>
[...]
>> +
>> +int mdio_mux_probe(struct platform_device *pdev,
>> + int (*switch_fn)(int cur, int desired, void *data),
>> + void *data)
>> +{
>> + struct device_node *parent_bus_node;
>> + struct device_node *child_bus_node;
>> + int r, n, ret_val;
>> + struct mii_bus *parent_bus;
>> + struct mdio_mux_parent_bus *pb;
>> + struct mdio_mux_child_bus *cb;
>> +
>> + if (!pdev->dev.of_node)
>> + return -ENODEV;
>> +
>> + parent_bus_node = of_parse_phandle(pdev->dev.of_node, "parent-bus", 0);
>> +
>> + if (!parent_bus_node)
>> + return -ENODEV;
>> +
>> + parent_bus = of_mdio_find_bus(parent_bus_node);
>
>
> So what happens if the parent bus probe happens after the mux probe?
>
The whole house of cards collapses.
Grant Likely has a patch to deal with this by retrying the probing, but
as far as I know, it has not been merged yet.
^ permalink raw reply
* Re: Query on a lockdep issue in neigh_lookup
From: Eric Dumazet @ 2011-09-13 23:59 UTC (permalink / raw)
To: Murali raja Muniraju; +Cc: netdev
In-Reply-To: <CAByGWUHkt=6AjW_GFsGd1EnbMC=pjhtxRu8ez0sw6rZNvA_nxg@mail.gmail.com>
Le mardi 13 septembre 2011 à 16:11 -0700, Murali raja Muniraju a écrit :
> Hi,
> I see a potential deadlock situation on the kernel 2.6.34. Has this
> been fixed in the later version of the kernel.
>
> I see that one after holding the neigh_lookup, one can acquire the
> lock for rt_hash_locks
>
> But there is a situation while freed skb's in dst_release while
> holding the rt_hash_locks, neigh_lookup can be called which tries to
> acquire its lock.
>
> This seems to be a deadlock candidate.
>
> Thanks,
> Murali
>
> Below if the scenario found by lockdep on a debug kernel during the
> kernel bootup.
>
All this code changed in 2.6.37 with commit
d6bf781712a1d25cc8987036b3a48535b331eb91
(net neigh: RCU conversion of neigh hash table)
^ permalink raw reply
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^ permalink raw reply
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^ permalink raw reply
* linux-next: manual merge of the net tree with the s390 tree
From: Stephen Rothwell @ 2011-09-14 2:50 UTC (permalink / raw)
To: David Miller, netdev
Cc: linux-next, linux-kernel, Peter Oberparleiter, Martin Schwidefsky,
Heiko Carstens, Frank Blaschka, Einar Lueck, Jan Glauber
Hi all,
Today's linux-next merge of the net tree got a conflict in
drivers/s390/cio/qdio_main.c between commit 003184781fea ("[S390] s390:
fix mismatch in summation of I/O IRQ statistics") from the s390 tree and
commit 104ea556ee7f ("qdio: support asynchronous delivery of storage
blocks") from the net tree.
Just context changes. I fixed it up (see below) and can carry the fix as
necessary.
--
Cheers,
Stephen Rothwell sfr@canb.auug.org.au
diff --cc drivers/s390/cio/qdio_main.c
index a122c1c,9a12228..0000000
--- a/drivers/s390/cio/qdio_main.c
+++ b/drivers/s390/cio/qdio_main.c
@@@ -14,6 -14,8 +14,7 @@@
#include <linux/timer.h>
#include <linux/delay.h>
#include <linux/gfp.h>
+ #include <linux/io.h>
-#include <linux/kernel_stat.h>
#include <linux/atomic.h>
#include <asm/debug.h>
#include <asm/qdio.h>
^ permalink raw reply
* Re: [PATCH] net: change capability used by socket options IP{,V6}_TRANSPARENT
From: Maciej Żenczykowski @ 2011-09-14 6:45 UTC (permalink / raw)
To: David Miller; +Cc: netdev, Balazs Scheidler
In-Reply-To: <1315927629.5851.4.camel@bzorp>
>> From: Maciej Żenczykowski <maze@google.com>
>>
>> Up till now the IP{,V6}_TRANSPARENT socket options (which actually set
>> the same bit in the socket struct) have required CAP_NET_ADMIN
>> privileges to set or clear the option.
>>
>> - we make clearing the bit not require any privileges.
>> - we deprecate using CAP_NET_ADMIN for this purpose.
>> - we introduce a new capability CAP_NET_TRANSPARENT,
>> which is tailored to allow setting just this bit.
>> - we allow either one of CAP_NET_TRANSPARENT or CAP_NET_RAW
>> to set this bit, because raw sockets already effectively
>> allow you to emulate socket transparency, and make the
>> transition easier for apps not desiring to use a brand
>> new capability (because of header file or glibc support)
>> - we print a warning (but allow it) if you try to set
>> the socket option with CAP_NET_ADMIN privs, but without
>> either one of CAP_NET_TRANSPARENT or CAP_NET_RAW.
>>
>> The reason for introducing a new capability is that while
>> transparent sockets are potentially dangerous (and can let you
>> spoof your source IP on traffic), they don't normally give you
>> the full 'freedom' of eavesdropping and/or spoofing that raw sockets
>> give you.
>>
>> Signed-off-by: Maciej Żenczykowski <maze@google.com>
>> CC: Balazs Scheidler <bazsi@balabit.hu>
>
> This is ok for me, as long as the security maintainers allow the
> introduction of this new cap.
>
> Thanks for doing this and sorry for the late reply.
>
> Acked-by: Balazs Scheidler <bazsi@balabit.hu>
>
> --
> Bazsi
I'm not really sure who else to CC on this...
^ permalink raw reply
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^ permalink raw reply
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