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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
Download patch file Download diff file Expand all files Collapse all files

2
drivers/net/ethernet/intel/ice/ice.h
View file

@ -671,7 +671,7 @@ static inline struct ice_pf *ice_netdev_to_pf(struct net_device *netdev)
static inline bool ice_is_xdp_ena_vsi(struct ice_vsi *vsi)
{
return !!vsi->xdp_prog;
return !!READ_ONCE(vsi->xdp_prog);
}
static inline void ice_set_ring_xdp(struct ice_tx_ring *ring)

4
drivers/net/ethernet/intel/ice/ice_main.c
View file

@ -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;
}

4
drivers/net/ethernet/intel/ice/ice_xsk.c
View file

@ -41,8 +41,10 @@ static void ice_qp_reset_stats(struct ice_vsi *vsi, u16 q_idx)
static void ice_qp_clean_rings(struct ice_vsi *vsi, u16 q_idx)
{
ice_clean_tx_ring(vsi->tx_rings[q_idx]);
if (ice_is_xdp_ena_vsi(vsi))
if (ice_is_xdp_ena_vsi(vsi)) {
synchronize_rcu();
ice_clean_tx_ring(vsi->xdp_rings[q_idx]);
}
ice_clean_rx_ring(vsi->rx_rings[q_idx]);
}