net/i40e: Fix concurrency issues between config flow and XSK

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Use synchronize_rcu to wait until the XSK wakeup function finishes
before destroying the resources it uses:

1. i40e_down already calls synchronize_rcu. On i40e_down either
__I40E_VSI_DOWN or __I40E_CONFIG_BUSY is set. Check the latter in
i40e_xsk_wakeup (the former is already checked there).

2. After switching the XDP program, call synchronize_rcu to let
i40e_xsk_wakeup exit before the XDP program is freed.

3. Changing the number of channels brings the interface down (see
i40e_prep_for_reset and i40e_pf_quiesce_all_vsi).

4. Disabling UMEM sets __I40E_CONFIG_BUSY, too.

Signed-off-by: Maxim Mikityanskiy <maximmi@mellanox.com>
Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20191217162023.16011-4-maximmi@mellanox.com

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Maxim Mikityanskiy 2019-12-17 16:20:45 +00:00 • committed by Daniel Borkmann

parent 9cf88808ad

commit b3873a5be7

3 changed files with 12 additions and 4 deletions

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2

drivers/net/ethernet/intel/i40e/i40e.h

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10

drivers/net/ethernet/intel/i40e/i40e_main.c

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4

drivers/net/ethernet/intel/i40e/i40e_xsk.c

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