[PATCH v5 0/3] interrupt disconnect/error event handling

[David Marchand]

On Tue, 3 Mar 2026 at 19:58, Kevin Traynor <ktraynor at redhat.com> wrote:
>
> These patches are to fix some issues with epoll event handling for
> EPOLLERR/EPOLLRDHUP/EPOLLHUP.
>
> 1/3: handles these disconnect/error events for interrupts that are read
> in eal
>
> 2/3: provides an internal API for interrupt callbacks to get the interrupt
> events for the active interrupt
>
> 3/3: deal with the observed issue as reported in
> https://bugs.dpdk.org/show_bug.cgi?id=1873 where mlx5 devx interrupts
> cause a busy-loop and 100% CPU of dpdk-intr thread.
>
> v5:
> - 2/3 changed API to rte_intr_active_event_flags() and made internal.
>   used RTE_BIT32() for defines. Added Cc: stable. Kept Acks as no
>   functional changes.
>
> v4:
> Updated to allow for case where devx interrupt handler may handle
> multiple completions during one interrupt call, leading to no data being
> read in a subsequent call as flagged by Slava.
>
> - 1/3 No change
> - 2/3 New API rte_intr_active_events() to get interrupt events
> - 3/3 Use new API in mlx5 devx interrupt handler to detect if
>   disconnect/error events and if so unregister the callback
>
> v3:
> - 1/2 and 2/2 fix some coding nits (Stephen/AI/David)
> - 2/2 Make log level consistant (David)
>
> v2:
> - Only handle disconnect/error epoll events when the read is done in eal
>   interrupt code. This is to allow interrupt handlers like virtio deal
>   with disconnects in an appropriate
> - Detect if not data is read in the mlx dex interrupt and if so unregister
>   the callback
>
> Kevin Traynor (3):
>   eal/linux: handle interrupt epoll events
>   eal/interrupt: add interrupt event info
>   net/mlx5: check devx disconnect/error interrupt events
>
>  drivers/net/mlx5/linux/mlx5_ethdev_os.c |  20 +++++
>  lib/eal/freebsd/eal_interrupts.c        |   7 ++
>  lib/eal/include/rte_interrupts.h        |  21 +++++
>  lib/eal/linux/eal_interrupts.c          | 103 +++++++++++++++++-------
>  lib/eal/windows/eal_interrupts.c        |   7 ++
>  5 files changed, 131 insertions(+), 27 deletions(-)

Series applied, thanks Kevin.


-- 
David Marchand