diff --git a/drivers/net/ethernet/freescale/enetc/enetc.c b/drivers/net/ethernet/freescale/enetc/enetc.c index e18a6c834eb43dd16a362b81040cedc44043a165..1c0aeaa13cdeedd26acd43f1710f2b70d744d4df 100644 --- a/drivers/net/ethernet/freescale/enetc/enetc.c +++ b/drivers/net/ethernet/freescale/enetc/enetc.c @@ -2626,6 +2626,7 @@ int enetc_setup_tc_mqprio(struct net_device *ndev, void *type_data) if (!num_tc) { netdev_reset_tc(ndev); netif_set_real_num_tx_queues(ndev, num_stack_tx_queues); + priv->min_num_stack_tx_queues = num_possible_cpus(); /* Reset all ring priorities to 0 */ for (i = 0; i < priv->num_tx_rings; i++) { @@ -2656,6 +2657,7 @@ int enetc_setup_tc_mqprio(struct net_device *ndev, void *type_data) /* Reset the number of netdev queues based on the TC count */ netif_set_real_num_tx_queues(ndev, num_tc); + priv->min_num_stack_tx_queues = num_tc; netdev_set_num_tc(ndev, num_tc); @@ -2702,9 +2704,20 @@ static int enetc_reconfigure_xdp_cb(struct enetc_ndev_priv *priv, void *ctx) static int enetc_setup_xdp_prog(struct net_device *ndev, struct bpf_prog *prog, struct netlink_ext_ack *extack) { + int num_xdp_tx_queues = prog ? num_possible_cpus() : 0; struct enetc_ndev_priv *priv = netdev_priv(ndev); bool extended; + if (priv->min_num_stack_tx_queues + num_xdp_tx_queues > + priv->num_tx_rings) { + NL_SET_ERR_MSG_FMT_MOD(extack, + "Reserving %d XDP TXQs does not leave a minimum of %d TXQs for network stack (total %d available)", + num_xdp_tx_queues, + priv->min_num_stack_tx_queues, + priv->num_tx_rings); + return -EBUSY; + } + extended = !!(priv->active_offloads & ENETC_F_RX_TSTAMP); /* The buffer layout is changing, so we need to drain the old @@ -2989,6 +3002,7 @@ int enetc_alloc_msix(struct enetc_ndev_priv *priv) if (err) goto fail; + priv->min_num_stack_tx_queues = num_possible_cpus(); first_xdp_tx_ring = priv->num_tx_rings - num_possible_cpus(); priv->xdp_tx_ring = &priv->tx_ring[first_xdp_tx_ring]; diff --git a/drivers/net/ethernet/freescale/enetc/enetc.h b/drivers/net/ethernet/freescale/enetc/enetc.h index 1fe8dfd6b6d4c0da84a4f540b4a406b8bf96e8b4..e21d096c5a9098424a4df07d2d6d4efcbc99180a 100644 --- a/drivers/net/ethernet/freescale/enetc/enetc.h +++ b/drivers/net/ethernet/freescale/enetc/enetc.h @@ -369,6 +369,9 @@ struct enetc_ndev_priv { struct psfp_cap psfp_cap; + /* Minimum number of TX queues required by the network stack */ + unsigned int min_num_stack_tx_queues; + struct phylink *phylink; int ic_mode; u32 tx_ictt;