136 lines
3.2 KiB
C
136 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2021, Intel Corporation. */
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#include <net/xdp_sock_drv.h>
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#include "stmmac.h"
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#include "stmmac_xdp.h"
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static int stmmac_xdp_enable_pool(struct stmmac_priv *priv,
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struct xsk_buff_pool *pool, u16 queue)
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{
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struct stmmac_channel *ch = &priv->channel[queue];
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bool need_update;
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u32 frame_size;
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int err;
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if (queue >= priv->plat->rx_queues_to_use ||
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queue >= priv->plat->tx_queues_to_use)
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return -EINVAL;
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frame_size = xsk_pool_get_rx_frame_size(pool);
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/* XDP ZC does not span multiple frame, make sure XSK pool buffer
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* size can at least store Q-in-Q frame.
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*/
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if (frame_size < ETH_FRAME_LEN + VLAN_HLEN * 2)
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return -EOPNOTSUPP;
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err = xsk_pool_dma_map(pool, priv->device, STMMAC_RX_DMA_ATTR);
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if (err) {
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netdev_err(priv->dev, "Failed to map xsk pool\n");
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return err;
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}
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need_update = netif_running(priv->dev) && stmmac_xdp_is_enabled(priv);
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if (need_update) {
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napi_disable(&ch->rx_napi);
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napi_disable(&ch->tx_napi);
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stmmac_disable_rx_queue(priv, queue);
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stmmac_disable_tx_queue(priv, queue);
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}
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set_bit(queue, priv->af_xdp_zc_qps);
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if (need_update) {
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stmmac_enable_rx_queue(priv, queue);
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stmmac_enable_tx_queue(priv, queue);
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napi_enable(&ch->rxtx_napi);
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err = stmmac_xsk_wakeup(priv->dev, queue, XDP_WAKEUP_RX);
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if (err)
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return err;
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}
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return 0;
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}
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static int stmmac_xdp_disable_pool(struct stmmac_priv *priv, u16 queue)
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{
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struct stmmac_channel *ch = &priv->channel[queue];
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struct xsk_buff_pool *pool;
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bool need_update;
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if (queue >= priv->plat->rx_queues_to_use ||
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queue >= priv->plat->tx_queues_to_use)
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return -EINVAL;
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pool = xsk_get_pool_from_qid(priv->dev, queue);
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if (!pool)
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return -EINVAL;
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need_update = netif_running(priv->dev) && stmmac_xdp_is_enabled(priv);
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if (need_update) {
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napi_disable(&ch->rxtx_napi);
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stmmac_disable_rx_queue(priv, queue);
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stmmac_disable_tx_queue(priv, queue);
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synchronize_rcu();
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}
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xsk_pool_dma_unmap(pool, STMMAC_RX_DMA_ATTR);
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clear_bit(queue, priv->af_xdp_zc_qps);
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if (need_update) {
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stmmac_enable_rx_queue(priv, queue);
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stmmac_enable_tx_queue(priv, queue);
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napi_enable(&ch->rx_napi);
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napi_enable(&ch->tx_napi);
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}
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return 0;
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}
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int stmmac_xdp_setup_pool(struct stmmac_priv *priv, struct xsk_buff_pool *pool,
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u16 queue)
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{
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return pool ? stmmac_xdp_enable_pool(priv, pool, queue) :
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stmmac_xdp_disable_pool(priv, queue);
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}
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int stmmac_xdp_set_prog(struct stmmac_priv *priv, struct bpf_prog *prog,
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struct netlink_ext_ack *extack)
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{
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struct net_device *dev = priv->dev;
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struct bpf_prog *old_prog;
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bool need_update;
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bool if_running;
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if_running = netif_running(dev);
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if (prog && dev->mtu > ETH_DATA_LEN) {
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/* For now, the driver doesn't support XDP functionality with
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* jumbo frames so we return error.
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*/
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NL_SET_ERR_MSG_MOD(extack, "Jumbo frames not supported");
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return -EOPNOTSUPP;
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}
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need_update = !!priv->xdp_prog != !!prog;
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if (if_running && need_update)
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stmmac_xdp_release(dev);
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old_prog = xchg(&priv->xdp_prog, prog);
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if (old_prog)
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bpf_prog_put(old_prog);
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/* Disable RX SPH for XDP operation */
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priv->sph = priv->sph_cap && !stmmac_xdp_is_enabled(priv);
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if (if_running && need_update)
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stmmac_xdp_open(dev);
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return 0;
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}
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