* [PATCH net-next] xen-netfront: fix warn message as irq device name has '/'
@ 2018-08-09 6:03 Xiao Liang
2018-08-10 10:54 ` Juergen Gross
0 siblings, 1 reply; 2+ messages in thread
From: Xiao Liang @ 2018-08-09 6:03 UTC (permalink / raw)
To: netdev, xen-devel, davem, jgross, boris.ostrovsky
Cc: linux-kernel, Xiao Liang
There is a call trace generated after commit 2d408c0d4574b01b9ed45e02516888bf925e11a9(
xen-netfront: fix queue name setting). There is no 'device/vif/xx-q0-tx' file found
under /proc/irq/xx/.
This patch only picks up device type and id as its name.
With the patch, now /proc/interrupts looks like and the warning message gone:
70: 21 0 0 0 xen-dyn -event vif0-q0-tx
71: 15 0 0 0 xen-dyn -event vif0-q0-rx
72: 14 0 0 0 xen-dyn -event vif0-q1-tx
73: 33 0 0 0 xen-dyn -event vif0-q1-rx
74: 12 0 0 0 xen-dyn -event vif0-q2-tx
75: 24 0 0 0 xen-dyn -event vif0-q2-rx
76: 19 0 0 0 xen-dyn -event vif0-q3-tx
77: 21 0 0 0 xen-dyn -event vif0-q3-rx
Below is call trace information without this patch:
name 'device/vif/0-q0-tx'
WARNING: CPU: 2 PID: 37 at fs/proc/generic.c:174 __xlate_proc_name+0x85/0xa0
RIP: 0010:__xlate_proc_name+0x85/0xa0
RSP: 0018:ffffb85c40473c18 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000006 RCX: 0000000000000006
RDX: 0000000000000007 RSI: 0000000000000096 RDI: ffff984c7f516930
RBP: ffffb85c40473cb8 R08: 000000000000002c R09: 0000000000000229
R10: 0000000000000000 R11: 0000000000000001 R12: ffffb85c40473c98
R13: ffffb85c40473cb8 R14: ffffb85c40473c50 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff984c7f500000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f69b6899038 CR3: 000000001c20a006 CR4: 00000000001606e0
Call Trace:
__proc_create+0x45/0x230
? snprintf+0x49/0x60
proc_mkdir_data+0x35/0x90
register_handler_proc+0xef/0x110
? proc_register+0xfc/0x110
? proc_create_data+0x70/0xb0
__setup_irq+0x39b/0x660
? request_threaded_irq+0xad/0x160
request_threaded_irq+0xf5/0x160
? xennet_tx_buf_gc+0x1d0/0x1d0 [xen_netfront]
bind_evtchn_to_irqhandler+0x3d/0x70
? xenbus_alloc_evtchn+0x41/0xa0
netback_changed+0xa46/0xcda [xen_netfront]
? find_watch+0x40/0x40
xenwatch_thread+0xc5/0x160
? finish_wait+0x80/0x80
kthread+0x112/0x130
? kthread_create_worker_on_cpu+0x70/0x70
ret_from_fork+0x35/0x40
Code: 81 5c 00 48 85 c0 75 cc 5b 49 89 2e 31 c0 5d 4d 89 3c 24 41 5c 41 5d 41 5e 41 5f c3 4c 89 ee 48 c7 c7 40 4f 0e b4 e8 65 ea d8 ff <0f> 0b b8 fe ff ff ff 5b 5d 41 5c 41 5d 41 5e 41 5f c3 66 0f 1f
---[ end trace 650e5561b0caab3a ]---
Signed-off-by: Xiao Liang <xiliang@redhat.com>
---
drivers/net/xen-netfront.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index 799cba4624a5..6f40df4a452e 100644
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -1604,14 +1604,16 @@ static int xennet_init_queue(struct netfront_queue *queue)
{
unsigned short i;
int err = 0;
+ int devid = 0;
spin_lock_init(&queue->tx_lock);
spin_lock_init(&queue->rx_lock);
timer_setup(&queue->rx_refill_timer, rx_refill_timeout, 0);
- snprintf(queue->name, sizeof(queue->name), "%s-q%u",
- queue->info->xbdev->nodename, queue->id);
+ kstrtoint(strrchr(queue->info->xbdev->nodename,'/')+1, 10, &devid);
+ snprintf(queue->name, sizeof(queue->name), "vif%d-q%u",
+ devid, queue->id);
/* Initialise tx_skbs as a free chain containing every entry. */
queue->tx_skb_freelist = 0;
--
2.17.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH net-next] xen-netfront: fix warn message as irq device name has '/'
2018-08-09 6:03 [PATCH net-next] xen-netfront: fix warn message as irq device name has '/' Xiao Liang
@ 2018-08-10 10:54 ` Juergen Gross
0 siblings, 0 replies; 2+ messages in thread
From: Juergen Gross @ 2018-08-10 10:54 UTC (permalink / raw)
To: Xiao Liang, netdev, xen-devel, davem, boris.ostrovsky; +Cc: linux-kernel
On 09/08/18 08:03, Xiao Liang wrote:
> There is a call trace generated after commit 2d408c0d4574b01b9ed45e02516888bf925e11a9(
> xen-netfront: fix queue name setting). There is no 'device/vif/xx-q0-tx' file found
> under /proc/irq/xx/.
>
> This patch only picks up device type and id as its name.
>
> With the patch, now /proc/interrupts looks like and the warning message gone:
> 70: 21 0 0 0 xen-dyn -event vif0-q0-tx
> 71: 15 0 0 0 xen-dyn -event vif0-q0-rx
> 72: 14 0 0 0 xen-dyn -event vif0-q1-tx
> 73: 33 0 0 0 xen-dyn -event vif0-q1-rx
> 74: 12 0 0 0 xen-dyn -event vif0-q2-tx
> 75: 24 0 0 0 xen-dyn -event vif0-q2-rx
> 76: 19 0 0 0 xen-dyn -event vif0-q3-tx
> 77: 21 0 0 0 xen-dyn -event vif0-q3-rx
>
> Below is call trace information without this patch:
>
> name 'device/vif/0-q0-tx'
> WARNING: CPU: 2 PID: 37 at fs/proc/generic.c:174 __xlate_proc_name+0x85/0xa0
> RIP: 0010:__xlate_proc_name+0x85/0xa0
> RSP: 0018:ffffb85c40473c18 EFLAGS: 00010286
> RAX: 0000000000000000 RBX: 0000000000000006 RCX: 0000000000000006
> RDX: 0000000000000007 RSI: 0000000000000096 RDI: ffff984c7f516930
> RBP: ffffb85c40473cb8 R08: 000000000000002c R09: 0000000000000229
> R10: 0000000000000000 R11: 0000000000000001 R12: ffffb85c40473c98
> R13: ffffb85c40473cb8 R14: ffffb85c40473c50 R15: 0000000000000000
> FS: 0000000000000000(0000) GS:ffff984c7f500000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007f69b6899038 CR3: 000000001c20a006 CR4: 00000000001606e0
> Call Trace:
> __proc_create+0x45/0x230
> ? snprintf+0x49/0x60
> proc_mkdir_data+0x35/0x90
> register_handler_proc+0xef/0x110
> ? proc_register+0xfc/0x110
> ? proc_create_data+0x70/0xb0
> __setup_irq+0x39b/0x660
> ? request_threaded_irq+0xad/0x160
> request_threaded_irq+0xf5/0x160
> ? xennet_tx_buf_gc+0x1d0/0x1d0 [xen_netfront]
> bind_evtchn_to_irqhandler+0x3d/0x70
> ? xenbus_alloc_evtchn+0x41/0xa0
> netback_changed+0xa46/0xcda [xen_netfront]
> ? find_watch+0x40/0x40
> xenwatch_thread+0xc5/0x160
> ? finish_wait+0x80/0x80
> kthread+0x112/0x130
> ? kthread_create_worker_on_cpu+0x70/0x70
> ret_from_fork+0x35/0x40
> Code: 81 5c 00 48 85 c0 75 cc 5b 49 89 2e 31 c0 5d 4d 89 3c 24 41 5c 41 5d 41 5e 41 5f c3 4c 89 ee 48 c7 c7 40 4f 0e b4 e8 65 ea d8 ff <0f> 0b b8 fe ff ff ff 5b 5d 41 5c 41 5d 41 5e 41 5f c3 66 0f 1f
> ---[ end trace 650e5561b0caab3a ]---
>
> Signed-off-by: Xiao Liang <xiliang@redhat.com>
> ---
> drivers/net/xen-netfront.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
> index 799cba4624a5..6f40df4a452e 100644
> --- a/drivers/net/xen-netfront.c
> +++ b/drivers/net/xen-netfront.c
> @@ -1604,14 +1604,16 @@ static int xennet_init_queue(struct netfront_queue *queue)
> {
> unsigned short i;
> int err = 0;
> + int devid = 0;
>
> spin_lock_init(&queue->tx_lock);
> spin_lock_init(&queue->rx_lock);
>
> timer_setup(&queue->rx_refill_timer, rx_refill_timeout, 0);
>
> - snprintf(queue->name, sizeof(queue->name), "%s-q%u",
> - queue->info->xbdev->nodename, queue->id);
> + kstrtoint(strrchr(queue->info->xbdev->nodename,'/')+1, 10, &devid);
Please add blanks before '/' and around the +.
With that you can add my:
Reviewed-by: Juergen Gross <jgross@suse.com>
Juergen
^ permalink raw reply [flat|nested] 2+ messages in thread
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