[PATCH] IRQ: parse msi_irqs directory if /proc/interrupts does not contain device name

[Jan Tluka]

For some NICs, e.g. Mellanox ones, the /proc/interrupts file does not contain
device name that we use to identify NIC IRQs. Based on Mellanox script
get_irq_list I added parsing of msi_irqs under /sys/class/net directory if the
former method returned empty list.

Signed-off-by: Jan Tluka <jtluka(a)redhat.com&gt;
---
 lnst/RecipeCommon/IRQ.py | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/lnst/RecipeCommon/IRQ.py b/lnst/RecipeCommon/IRQ.py
index 825a2b3..88d673b 100644
--- a/lnst/RecipeCommon/IRQ.py
+++ b/lnst/RecipeCommon/IRQ.py
@@ -24,6 +24,15 @@ def pin_dev_irqs(machine, device, cpu):
                     % device.get_devname())
     res = pi.get_result()
     intrs = res["res_data"]["stdout"]
+    split = intrs.split('\n')
+    if len(split) == 1 and split[0] == '':
+        # try to get interrupts from msi_irqs directory
+        pi = machine.run("dev_irqs=/sys/class/net/%s/device/msi_irqs; "
+                         "[ -d $dev_irqs ] && ls -1 $dev_irqs"
+                        % device.get_devname())
+        res = pi.get_result()
+        intrs = res["res_data"]["stdout"]
+
     for intr in intrs.split('\n'):
         try:
             int(intr)
-- 
2.9.5

[Ondrej Lichtner]

On Fri, Aug 25, 2017 at 04:08:23PM +0200, Jan Tluka wrote:
>  For some NICs, e.g. Mellanox ones, the /proc/interrupts file does not
> contain
>  device name that we use to identify NIC IRQs. Based on Mellanox script
>  get_irq_list I added parsing of msi_irqs under /sys/class/net directory if the
>  former method returned empty list.
>  
>  Signed-off-by: Jan Tluka <jtluka(a)redhat.com&gt;
>  ---
>   lnst/RecipeCommon/IRQ.py | 9 +++++++++
>   1 file changed, 9 insertions(+)
>  
>  diff --git a/lnst/RecipeCommon/IRQ.py b/lnst/RecipeCommon/IRQ.py
>  index 825a2b3..88d673b 100644
>  --- a/lnst/RecipeCommon/IRQ.py
>  +++ b/lnst/RecipeCommon/IRQ.py
>  @@ -24,6 +24,15 @@ def pin_dev_irqs(machine, device, cpu):
>                       % device.get_devname())
>       res = pi.get_result()
>       intrs = res["res_data"]["stdout"]
>  +    split = intrs.split('\n')
>  +    if len(split) == 1 and split[0] == '':
>  +        # try to get interrupts from msi_irqs directory
>  +        pi = machine.run("dev_irqs=/sys/class/net/%s/device/msi_irqs; "
>  +                         "[ -d $dev_irqs ] && ls -1 $dev_irqs"
>  +                        % device.get_devname())
>  +        res = pi.get_result()
>  +        intrs = res["res_data"]["stdout"]
>  +
>       for intr in intrs.split('\n'):
>           try:
>               int(intr)
>  -- 
>  2.9.5
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pushed, thanks
-Ondrej