netdev - Re: [patch net-next RFC v2 00/11] Add support for resource abstraction

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Message-ID: <fa2fabee-0961-f7da-580a-c69c24e1bfd6@cumulusnetworks.com>
Date:   Fri, 17 Nov 2017 12:58:40 -0700
From:   David Ahern <dsa@...ulusnetworks.com>
To:     Jiri Pirko <jiri@...nulli.us>, netdev@...r.kernel.org
Cc:     davem@...emloft.net, mlxsw@...lanox.com, andrew@...n.ch,
        vivien.didelot@...oirfairelinux.com, f.fainelli@...il.com,
        michael.chan@...adcom.com, ganeshgr@...lsio.com,
        saeedm@...lanox.com, matanb@...lanox.com, leonro@...lanox.com,
        idosch@...lanox.com, jakub.kicinski@...ronome.com, ast@...nel.org,
        daniel@...earbox.net, simon.horman@...ronome.com,
        pieter.jansenvanvuuren@...ronome.com, john.hurley@...ronome.com,
        alexander.h.duyck@...el.com, linville@...driver.com,
        gospo@...adcom.com, steven.lin1@...adcom.com, yuvalm@...lanox.com,
        ogerlitz@...lanox.com, roopa@...ulusnetworks.com
Subject: Re: [patch net-next RFC v2 00/11] Add support for resource
 abstraction

On 11/14/17 9:18 AM, Jiri Pirko wrote:
> From: Jiri Pirko <jiri@...lanox.com>
> 
> Arkadi says:
> 
> Many of the ASIC's internal resources are limited and are shared between
> several hardware procedures. For example, unified hash-based memory can
> be used for many lookup purposes, like FDB and LPM. In many cases the user
> can provide a partitioning scheme for such a resource in order to perform
> fine tuning for his application. In many cases after setting the
> partitioning of the resource driver reload is needed. This patchset add
> support for hot reset of the driver.
> 
> Such an abstraction can be coupled with devlink's dpipe interface, which
> models the ASIC's pipeline as an graph of match/action tables. By modeling
> the hardware resource object, and by coupling it to several dpipe tables,
> further visibility can be achieved in order to debug ASIC-wide issues.
> 
> The proposed interface will provide the user the ability to understand the
> limitations of the hardware, and receive notification regarding its occupancy.
> Furthermore, monitoring the resource occupancy can be done in real-time and
> can be useful in many cases.
> 
> Userspace part prototype can be found at https://github.com/arkadis/iproute2/
> at resource_dev branch.
> 

now that my firmware problem is fixed, I installed a build with this
patch set. Trying to run devlink to split a port hangs:

$ devlink port split swp1 count 4


[  615.373359] INFO: task devlink:804 blocked for more than 120 seconds.
[  615.379934]       Tainted: G        W       4.14.0+ #38
[  615.385238] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[  615.393111] devlink         D    0   804    771 0x00000080
[  615.393115] Call Trace:
[  615.393126]  __schedule+0x1de/0x690
[  615.393130]  schedule+0x36/0x80
[  615.393139]  schedule_preempt_disabled+0xe/0x10
[  615.393146]  __mutex_lock.isra.4+0x211/0x530
[  615.393152]  __mutex_lock_slowpath+0x13/0x20
[  615.393155]  ? __mutex_lock_slowpath+0x13/0x20
[  615.393158]  mutex_lock+0x2f/0x40
[  615.393164]  devlink_port_unregister+0x29/0x60 [devlink]
[  615.393169]  mlxsw_core_port_fini+0x25/0x50 [mlxsw_core]
[  615.393179]  mlxsw_sp_port_remove+0xf0/0x100 [mlxsw_spectrum]
[  615.393186]  mlxsw_sp_port_split+0xdc/0x260 [mlxsw_spectrum]
[  615.393193]  ? _cond_resched+0x19/0x30
[  615.393200]  mlxsw_devlink_port_split+0x36/0x50 [mlxsw_core]
[  615.393206]  devlink_nl_cmd_port_split_doit+0x42/0x50 [devlink]
[  615.393212]  genl_family_rcv_msg+0x1c9/0x390
[  615.393217]  genl_rcv_msg+0x4c/0xa0
[  615.393220]  ? _cond_resched+0x19/0x30
[  615.393228]  ? genl_family_rcv_msg+0x390/0x390
[  615.393232]  netlink_rcv_skb+0xec/0x120
[  615.393235]  genl_rcv+0x28/0x40
[  615.393239]  netlink_unicast+0x170/0x230
[  615.393244]  netlink_sendmsg+0x28e/0x370
[  615.393251]  SYSC_sendto+0x10e/0x1b0
[  615.393258]  ? __audit_syscall_entry+0xc1/0x110
[  615.393261]  ? syscall_trace_enter+0x1c6/0x2d0
[  615.393264]  ? __do_page_fault+0x231/0x4b0
[  615.393268]  SyS_sendto+0xe/0x10
[  615.393272]  do_syscall_64+0x60/0x1f0
[  615.393277]  entry_SYSCALL64_slow_path+0x25/0x25
[  615.393280] RIP: 0033:0x7f4ef43c16f3
[  615.393284] RSP: 002b:00007fffb907fbc8 EFLAGS: 00000246 ORIG_RAX:
000000000000002c
[  615.393287] RAX: ffffffffffffffda RBX: 00000000013660e0 RCX:
00007f4ef43c16f3
[  615.393290] RDX: 0000000000000040 RSI: 0000000001366110 RDI:
0000000000000003
[  615.393291] RBP: 0000000000000000 R08: 00007f4ef4686d80 R09:
000000000000000c
[  615.393292] R10: 0000000000000000 R11: 0000000000000246 R12:
0000000000000000
[  615.393296] R13: 0000000000000004 R14: 0000000000000000 R15:
0000000000000000