| // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB |
| /* Copyright (c) 2019-2020, Mellanox Technologies inc. All rights reserved. */ |
| |
| #include <net/xdp_sock_drv.h> |
| #include "pool.h" |
| #include "setup.h" |
| #include "en/params.h" |
| |
| static int mlx5e_xsk_map_pool(struct mlx5e_priv *priv, |
| struct xsk_buff_pool *pool) |
| { |
| struct device *dev = mlx5_core_dma_dev(priv->mdev); |
| |
| return xsk_pool_dma_map(pool, dev, DMA_ATTR_SKIP_CPU_SYNC); |
| } |
| |
| static void mlx5e_xsk_unmap_pool(struct mlx5e_priv *priv, |
| struct xsk_buff_pool *pool) |
| { |
| return xsk_pool_dma_unmap(pool, DMA_ATTR_SKIP_CPU_SYNC); |
| } |
| |
| static int mlx5e_xsk_get_pools(struct mlx5e_xsk *xsk) |
| { |
| if (!xsk->pools) { |
| xsk->pools = kcalloc(MLX5E_MAX_NUM_CHANNELS, |
| sizeof(*xsk->pools), GFP_KERNEL); |
| if (unlikely(!xsk->pools)) |
| return -ENOMEM; |
| } |
| |
| xsk->refcnt++; |
| xsk->ever_used = true; |
| |
| return 0; |
| } |
| |
| static void mlx5e_xsk_put_pools(struct mlx5e_xsk *xsk) |
| { |
| if (!--xsk->refcnt) { |
| kfree(xsk->pools); |
| xsk->pools = NULL; |
| } |
| } |
| |
| static int mlx5e_xsk_add_pool(struct mlx5e_xsk *xsk, struct xsk_buff_pool *pool, u16 ix) |
| { |
| int err; |
| |
| err = mlx5e_xsk_get_pools(xsk); |
| if (unlikely(err)) |
| return err; |
| |
| xsk->pools[ix] = pool; |
| return 0; |
| } |
| |
| static void mlx5e_xsk_remove_pool(struct mlx5e_xsk *xsk, u16 ix) |
| { |
| xsk->pools[ix] = NULL; |
| |
| mlx5e_xsk_put_pools(xsk); |
| } |
| |
| static bool mlx5e_xsk_is_pool_sane(struct xsk_buff_pool *pool) |
| { |
| return xsk_pool_get_headroom(pool) <= 0xffff && |
| xsk_pool_get_chunk_size(pool) <= 0xffff; |
| } |
| |
| void mlx5e_build_xsk_param(struct xsk_buff_pool *pool, struct mlx5e_xsk_param *xsk) |
| { |
| xsk->headroom = xsk_pool_get_headroom(pool); |
| xsk->chunk_size = xsk_pool_get_chunk_size(pool); |
| } |
| |
| static int mlx5e_xsk_enable_locked(struct mlx5e_priv *priv, |
| struct xsk_buff_pool *pool, u16 ix) |
| { |
| struct mlx5e_params *params = &priv->channels.params; |
| struct mlx5e_xsk_param xsk; |
| struct mlx5e_channel *c; |
| int err; |
| |
| if (unlikely(mlx5e_xsk_get_pool(&priv->channels.params, &priv->xsk, ix))) |
| return -EBUSY; |
| |
| if (unlikely(!mlx5e_xsk_is_pool_sane(pool))) |
| return -EINVAL; |
| |
| err = mlx5e_xsk_map_pool(priv, pool); |
| if (unlikely(err)) |
| return err; |
| |
| err = mlx5e_xsk_add_pool(&priv->xsk, pool, ix); |
| if (unlikely(err)) |
| goto err_unmap_pool; |
| |
| mlx5e_build_xsk_param(pool, &xsk); |
| |
| if (!test_bit(MLX5E_STATE_OPENED, &priv->state)) { |
| /* XSK objects will be created on open. */ |
| goto validate_closed; |
| } |
| |
| if (!params->xdp_prog) { |
| /* XSK objects will be created when an XDP program is set, |
| * and the channels are reopened. |
| */ |
| goto validate_closed; |
| } |
| |
| c = priv->channels.c[ix]; |
| |
| err = mlx5e_open_xsk(priv, params, &xsk, pool, c); |
| if (unlikely(err)) |
| goto err_remove_pool; |
| |
| mlx5e_activate_xsk(c); |
| |
| /* Don't wait for WQEs, because the newer xdpsock sample doesn't provide |
| * any Fill Ring entries at the setup stage. |
| */ |
| |
| err = mlx5e_rx_res_xsk_activate(priv->rx_res, &priv->channels, ix); |
| if (unlikely(err)) |
| goto err_deactivate; |
| |
| return 0; |
| |
| err_deactivate: |
| mlx5e_deactivate_xsk(c); |
| mlx5e_close_xsk(c); |
| |
| err_remove_pool: |
| mlx5e_xsk_remove_pool(&priv->xsk, ix); |
| |
| err_unmap_pool: |
| mlx5e_xsk_unmap_pool(priv, pool); |
| |
| return err; |
| |
| validate_closed: |
| /* Check the configuration in advance, rather than fail at a later stage |
| * (in mlx5e_xdp_set or on open) and end up with no channels. |
| */ |
| if (!mlx5e_validate_xsk_param(params, &xsk, priv->mdev)) { |
| err = -EINVAL; |
| goto err_remove_pool; |
| } |
| |
| return 0; |
| } |
| |
| static int mlx5e_xsk_disable_locked(struct mlx5e_priv *priv, u16 ix) |
| { |
| struct xsk_buff_pool *pool = mlx5e_xsk_get_pool(&priv->channels.params, |
| &priv->xsk, ix); |
| struct mlx5e_channel *c; |
| |
| if (unlikely(!pool)) |
| return -EINVAL; |
| |
| if (!test_bit(MLX5E_STATE_OPENED, &priv->state)) |
| goto remove_pool; |
| |
| /* XSK RQ and SQ are only created if XDP program is set. */ |
| if (!priv->channels.params.xdp_prog) |
| goto remove_pool; |
| |
| c = priv->channels.c[ix]; |
| mlx5e_rx_res_xsk_deactivate(priv->rx_res, ix); |
| mlx5e_deactivate_xsk(c); |
| mlx5e_close_xsk(c); |
| |
| remove_pool: |
| mlx5e_xsk_remove_pool(&priv->xsk, ix); |
| mlx5e_xsk_unmap_pool(priv, pool); |
| |
| return 0; |
| } |
| |
| static int mlx5e_xsk_enable_pool(struct mlx5e_priv *priv, struct xsk_buff_pool *pool, |
| u16 ix) |
| { |
| int err; |
| |
| mutex_lock(&priv->state_lock); |
| err = mlx5e_xsk_enable_locked(priv, pool, ix); |
| mutex_unlock(&priv->state_lock); |
| |
| return err; |
| } |
| |
| static int mlx5e_xsk_disable_pool(struct mlx5e_priv *priv, u16 ix) |
| { |
| int err; |
| |
| mutex_lock(&priv->state_lock); |
| err = mlx5e_xsk_disable_locked(priv, ix); |
| mutex_unlock(&priv->state_lock); |
| |
| return err; |
| } |
| |
| int mlx5e_xsk_setup_pool(struct net_device *dev, struct xsk_buff_pool *pool, u16 qid) |
| { |
| struct mlx5e_priv *priv = netdev_priv(dev); |
| struct mlx5e_params *params = &priv->channels.params; |
| u16 ix; |
| |
| if (unlikely(!mlx5e_qid_get_ch_if_in_group(params, qid, MLX5E_RQ_GROUP_XSK, &ix))) |
| return -EINVAL; |
| |
| return pool ? mlx5e_xsk_enable_pool(priv, pool, ix) : |
| mlx5e_xsk_disable_pool(priv, ix); |
| } |