[PATCH v5 0/7] multi-process and VF hotplug fixes

Long Li
2026-02-27T01:59:37Z

Fix several issues with VF hotplug and multi-process support in
netvsc, mana, mlx5, and mlx4 drivers:

- Fix race conditions between VSP notifications and DPDK device events
during VF add/remove, with proper locking of VF-related fields
- Add multi-process communication infrastructure for coordinating VF
removal across primary and secondary processes
- Fix Protection Domain resource leak on device close in mana
- Fix devargs memory leak during VF hotplug in netvsc
- Fix fast-path ops (rte_eth_fp_ops) setup in secondary processes for
mana, mlx5, and mlx4, ensuring burst function pointers are restored
after STOP->START cycles

v5:
- Patches 5,6,7: Also restore rte_eth_fp_ops burst function pointers
(rx_pkt_burst, tx_pkt_burst) in START_RXTX handler, not just queue
data pointers. Without this, after a STOP->START cycle the secondary
process burst pointers remain set to dummy functions.

v4:
- Patch 1: Check hn_vf_add() return value in netvsc_hotplug_retry
- Patch 1: Track fresh_attach to avoid tearing down original VF
attachment when configure/start fails on an -EEXIST path
- Patch 2: Move counter decrement and netvsc_uninit_once() after device
cleanup in eth_hn_remove() to prevent use-after-free of shared data
- Patch 2: Clear netvsc_shared_data on init failure paths to prevent
dangling pointer

v3:
- Fix review comments from v2

v2:
- Initial rework of VF add/remove locking

Long Li (7):
net/netvsc: fix race conditions on VF add/remove events
net/netvsc: add multi-process VF device removal support
net/mana: fix PD resource leak on device close
net/netvsc: fix devargs memory leak on hotplug
net/mana: fix fast-path ops setup in secondary process
net/mlx5: fix fast-path ops setup in secondary process
net/mlx4: fix fast-path ops setup in secondary process

drivers/net/mana/mana.c | 14 ++
drivers/net/mana/mp.c | 8 +
drivers/net/mlx4/mlx4_mp.c | 6 +
drivers/net/mlx5/linux/mlx5_mp_os.c | 6 +
drivers/net/netvsc/hn_ethdev.c | 300 +++++++++++++++++++++++++++-
drivers/net/netvsc/hn_nvs.h | 6 +
drivers/net/netvsc/hn_rxtx.c | 40 ++--
drivers/net/netvsc/hn_var.h | 1 +
drivers/net/netvsc/hn_vf.c | 148 ++++++++------
9 files changed, 437 insertions(+), 92 deletions(-)

--
2.43.0