diff options
Diffstat (limited to 'drivers/net/ethernet/intel/libeth/xdp.c')
| -rw-r--r-- | drivers/net/ethernet/intel/libeth/xdp.c | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/drivers/net/ethernet/intel/libeth/xdp.c b/drivers/net/ethernet/intel/libeth/xdp.c index 1607579d65bb..4eb0f3c6cdab 100644 --- a/drivers/net/ethernet/intel/libeth/xdp.c +++ b/drivers/net/ethernet/intel/libeth/xdp.c @@ -340,6 +340,75 @@ head: } EXPORT_SYMBOL_GPL(libeth_xdp_return_buff_bulk); +/* Misc */ + +/** + * libeth_xdp_queue_threshold - calculate XDP queue clean/refill threshold + * @count: number of descriptors in the queue + * + * The threshold is the limit at which RQs start to refill (when the number of + * empty buffers exceeds it) and SQs get cleaned up (when the number of free + * descriptors goes below it). To speed up hotpath processing, threshold is + * always pow-2, closest to 1/4 of the queue length. + * Don't call it on hotpath, calculate and cache the threshold during the + * queue initialization. + * + * Return: the calculated threshold. + */ +u32 libeth_xdp_queue_threshold(u32 count) +{ + u32 quarter, low, high; + + if (likely(is_power_of_2(count))) + return count >> 2; + + quarter = DIV_ROUND_CLOSEST(count, 4); + low = rounddown_pow_of_two(quarter); + high = roundup_pow_of_two(quarter); + + return high - quarter <= quarter - low ? high : low; +} +EXPORT_SYMBOL_GPL(libeth_xdp_queue_threshold); + +/** + * __libeth_xdp_set_features - set XDP features for netdev + * @dev: &net_device to configure + * @xmo: XDP metadata ops (Rx hints) + * + * Set all the features libeth_xdp supports. Only the first argument is + * necessary. + * Use the non-underscored versions in drivers instead. + */ +void __libeth_xdp_set_features(struct net_device *dev, + const struct xdp_metadata_ops *xmo) +{ + xdp_set_features_flag(dev, + NETDEV_XDP_ACT_BASIC | + NETDEV_XDP_ACT_REDIRECT | + NETDEV_XDP_ACT_NDO_XMIT | + NETDEV_XDP_ACT_RX_SG | + NETDEV_XDP_ACT_NDO_XMIT_SG); + dev->xdp_metadata_ops = xmo; +} +EXPORT_SYMBOL_GPL(__libeth_xdp_set_features); + +/** + * libeth_xdp_set_redirect - toggle the XDP redirect feature + * @dev: &net_device to configure + * @enable: whether XDP is enabled + * + * Use this when XDPSQs are not always available to dynamically enable + * and disable redirect feature. + */ +void libeth_xdp_set_redirect(struct net_device *dev, bool enable) +{ + if (enable) + xdp_features_set_redirect_target(dev, true); + else + xdp_features_clear_redirect_target(dev); +} +EXPORT_SYMBOL_GPL(libeth_xdp_set_redirect); + /* Module */ static const struct libeth_xdp_ops xdp_ops __initconst = { |