From mboxrd@z Thu Jan 1 00:00:00 1970 From: Maciej Fijalkowski Date: Tue, 1 Jun 2021 13:32:35 +0200 Subject: [Intel-wired-lan] [PATCH intel-next 1/2] ice: unify xdp_rings accesses In-Reply-To: <20210601113236.42651-1-maciej.fijalkowski@intel.com> References: <20210601113236.42651-1-maciej.fijalkowski@intel.com> Message-ID: <20210601113236.42651-2-maciej.fijalkowski@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: intel-wired-lan@osuosl.org List-ID: There has been a long lasting issue of improper xdp_rings indexing for XDP_TX and XDP_REDIRECT actions. Given that currently rx_ring->q_index is mixed with smp_processor_id(), there could be a situation where Tx descriptors are produced onto XDP Tx ring, but tail is never bumped - for example pin a particular queue id to non-matching IRQ line. Moreover, user can reduce the count of Rx queues which is the base for sizing xdp_rings array so smp_processor_id() could cause an out of bounds access. Address that problem by ignoring the user ring count setting and always initialize the xdp_rings array to be of num_possible_cpus() size. Then, always use the smp_processor_id() as an index to xdp_rings array. This provides serialization as at given time only a single softirq can run on a particular CPU. Signed-off-by: Maciej Fijalkowski --- drivers/net/ethernet/intel/ice/ice_lib.c | 2 +- drivers/net/ethernet/intel/ice/ice_main.c | 2 +- drivers/net/ethernet/intel/ice/ice_txrx_lib.c | 2 +- 3 files changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/net/ethernet/intel/ice/ice_lib.c b/drivers/net/ethernet/intel/ice/ice_lib.c index 2c33b0c56c94..3c8668d8b964 100644 --- a/drivers/net/ethernet/intel/ice/ice_lib.c +++ b/drivers/net/ethernet/intel/ice/ice_lib.c @@ -3099,7 +3099,7 @@ int ice_vsi_rebuild(struct ice_vsi *vsi, bool init_vsi) ice_vsi_map_rings_to_vectors(vsi); if (ice_is_xdp_ena_vsi(vsi)) { - vsi->num_xdp_txq = vsi->alloc_rxq; + vsi->num_xdp_txq = num_possible_cpus(); ret = ice_prepare_xdp_rings(vsi, vsi->xdp_prog); if (ret) goto err_vectors; diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c index 0eb2307325d3..1915b6a734e2 100644 --- a/drivers/net/ethernet/intel/ice/ice_main.c +++ b/drivers/net/ethernet/intel/ice/ice_main.c @@ -2534,7 +2534,7 @@ ice_xdp_setup_prog(struct ice_vsi *vsi, struct bpf_prog *prog, } if (!ice_is_xdp_ena_vsi(vsi) && prog) { - vsi->num_xdp_txq = vsi->alloc_rxq; + vsi->num_xdp_txq = num_possible_cpus(); xdp_ring_err = ice_prepare_xdp_rings(vsi, prog); if (xdp_ring_err) NL_SET_ERR_MSG_MOD(extack, "Setting up XDP Tx resources failed"); diff --git a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c index 207f6ee3a7f6..e1c05d69f017 100644 --- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c +++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c @@ -279,7 +279,7 @@ void ice_finalize_xdp_rx(struct ice_ring *rx_ring, unsigned int xdp_res) if (xdp_res & ICE_XDP_TX) { struct ice_ring *xdp_ring = - rx_ring->vsi->xdp_rings[rx_ring->q_index]; + rx_ring->vsi->xdp_rings[smp_processor_id()]; ice_xdp_ring_update_tail(xdp_ring); } -- 2.20.1