From: Maciej Fijalkowski maciej.fijalkowski@intel.com
[ Upstream commit f9124c68f05ffdb87a47e3ea6d5fae9dad7cb6eb ]
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 b3873a5be757 ("net/i40e: Fix concurrency issues between config flow and XSK")
Fixes: efc2214b6047 ("ice: Add support for XDP") Fixes: 2d4238f55697 ("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 Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/intel/ice/ice.h | 2 +- drivers/net/ethernet/intel/ice/ice_main.c | 4 +++- drivers/net/ethernet/intel/ice/ice_xsk.c | 4 +++- 3 files changed, 7 insertions(+), 3 deletions(-)
diff --git a/drivers/net/ethernet/intel/ice/ice.h b/drivers/net/ethernet/intel/ice/ice.h index 6a57b41ddb54..7794703c1359 100644 --- a/drivers/net/ethernet/intel/ice/ice.h +++ b/drivers/net/ethernet/intel/ice/ice.h @@ -498,7 +498,7 @@ 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_ring *ring) diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c index 20c9d55f3adc..eb0625b52e45 100644 --- a/drivers/net/ethernet/intel/ice/ice_main.c +++ b/drivers/net/ethernet/intel/ice/ice_main.c @@ -2475,8 +2475,10 @@ int ice_destroy_xdp_rings(struct ice_vsi *vsi)
for (i = 0; i < vsi->num_xdp_txq; 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; } diff --git a/drivers/net/ethernet/intel/ice/ice_xsk.c b/drivers/net/ethernet/intel/ice/ice_xsk.c index 9f36f8d7a985..5733526fa245 100644 --- a/drivers/net/ethernet/intel/ice/ice_xsk.c +++ b/drivers/net/ethernet/intel/ice/ice_xsk.c @@ -36,8 +36,10 @@ 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]); }