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ice: synchronize_rcu() when terminating rings

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Unfortunately, the ice driver doesn't respect the RCU critical section that
XSK wakeup is surrounded with. To fix this, add synchronize_rcu() calls to
paths that destroy resources that might be in use.

This was addressed in other AF_XDP ZC enabled drivers, for reference see
for example commit b3873a5be7 ("net/i40e: Fix concurrency issues
between config flow and XSK")

Fixes: efc2214b60 ("ice: Add support for XDP")
Fixes: 2d4238f556 ("ice: Add support for AF_XDP")
Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Tested-by: Shwetha Nagaraju <shwetha.nagaraju@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
This commit is contained in:
Maciej Fijalkowski
2022-03-17 19:36:27 +01:00
committed by Tony Nguyen
parent 1158f79f82
commit f9124c68f0
3 changed files with 7 additions and 3 deletions
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4
drivers/net/ethernet/intel/ice/ice_main.c
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@@ -2758,8 +2758,10 @@ free_qmap:
ice_for_each_xdp_txq(vsi, i)
if (vsi->xdp_rings[i]) {
if (vsi->xdp_rings[i]->desc)
if (vsi->xdp_rings[i]->desc) {
synchronize_rcu();
ice_free_tx_ring(vsi->xdp_rings[i]);
}
kfree_rcu(vsi->xdp_rings[i], rcu);
vsi->xdp_rings[i] = NULL;
}