IRQ assignment for queues

[Srivats P <pstavirs@xxxxxxxxx>]

Hi,

Not a XDP question, but more generic about IRQ assignment for queues.

For a NIC which has separate RX and TX queues (no COMBINED queues), I
see in /proc/interrupts that only 1 IRQ is assigned.

srivatsp@EXA8:~$ sudo ethtool -L enp5s0f1 rx 1 tx 1 combined 0
combined unmodified, ignoring
srivatsp@EXA8:~$ ethtool -l enp5s0f1
Channel parameters for enp5s0f1:
Pre-set maximums:
RX:             4
TX:             4
Other:          0
Combined:       0
Current hardware settings:
RX:             1
TX:             1
Other:          0
Combined:       0

srivatsp@EXA8:~$ cat /proc/interrupts | grep enp5s0f1
 73:          0          2          0          0   ITS-MSI 2623488
Edge      enp5s0f1-rxtx-0
 89:          0          0          0          0   ITS-MSI 2623504
Edge      enp5s0f1-rbdr-0
 92:          0          0          0          0   ITS-MSI 2623507
Edge      enp5s0f1-qset-err-0

Is the IRQ for the RX queue or TX queue or both? Does Tx need an IRQ?

Srivats