[PATCH 0/8] fix multi-process VF hotplug

longli
2026-02-20T10:09:47Z

From: Long Li <longli@microsoft.com>

This series fixes multi-process support for DPDK drivers used on
Azure VMs with Accelerated Networking (AN). When AN is toggled, the
VF device is hot-removed and hot-added, which can crash secondary
processes due to stale fast-path pointers and race conditions.

Patches 1-3 fix the netvsc PMD:
- Prevent secondary from calling unsupported promiscuous ops
- Fix rwlock misuse and race conditions on VF add/remove events
- Add multi-process VF device removal support via IPC

Patches 4-5 fix resource leaks:
- MANA PD resource leak on device close
- netvsc devargs memory leak on hotplug

Patches 6-8 fix a common bug across MANA, MLX5, and MLX4 drivers
where the secondary process START_RXTX/STOP_RXTX IPC handlers
update dev->rx_pkt_burst/tx_pkt_burst but do not update the
process-local rte_eth_fp_ops[] array. Since rte_eth_rx_burst()
uses rte_eth_fp_ops (not dev->rx_pkt_burst), the secondary retains
stale queue data pointers after VF hot-add, causing a segfault.

Long Li (8):
net/netvsc: secondary ignore promiscuous enable/disable
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 | 6 +
drivers/net/mlx4/mlx4_mp.c | 4 +
drivers/net/mlx5/linux/mlx5_mp_os.c | 4 +
drivers/net/netvsc/hn_ethdev.c | 288 +++++++++++++++++++++++++++-
drivers/net/netvsc/hn_nvs.h | 5 +
drivers/net/netvsc/hn_rxtx.c | 40 ++--
drivers/net/netvsc/hn_var.h | 1 +
drivers/net/netvsc/hn_vf.c | 122 ++++++------
9 files changed, 397 insertions(+), 87 deletions(-)

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2.43.0