[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