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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2020, Intel Corporation. */
#include <linux/if_vlan.h>
#include <net/xdp_sock_drv.h>
#include "igc.h"
#include "igc_xdp.h"
int igc_xdp_set_prog(struct igc_adapter *adapter, struct bpf_prog *prog,
struct netlink_ext_ack *extack)
{
struct net_device *dev = adapter->netdev;
bool if_running = netif_running(dev);
struct bpf_prog *old_prog;
if (dev->mtu > ETH_DATA_LEN) {
/* For now, the driver doesn't support XDP functionality with
* jumbo frames so we return error.
*/
NL_SET_ERR_MSG_MOD(extack, "Jumbo frames not supported");
return -EOPNOTSUPP;
}
if (if_running)
igc_close(dev);
old_prog = xchg(&adapter->xdp_prog, prog);
if (old_prog)
bpf_prog_put(old_prog);
if (if_running)
igc_open(dev);
return 0;
}
static int igc_xdp_enable_pool(struct igc_adapter *adapter,
struct xsk_buff_pool *pool, u16 queue_id)
{
struct net_device *ndev = adapter->netdev;
struct device *dev = &adapter->pdev->dev;
struct igc_ring *rx_ring, *tx_ring;
struct napi_struct *napi;
bool needs_reset;
u32 frame_size;
int err;
if (queue_id >= adapter->num_rx_queues ||
queue_id >= adapter->num_tx_queues)
return -EINVAL;
frame_size = xsk_pool_get_rx_frame_size(pool);
if (frame_size < ETH_FRAME_LEN + VLAN_HLEN * 2) {
/* When XDP is enabled, the driver doesn't support frames that
* span over multiple buffers. To avoid that, we check if xsk
* frame size is big enough to fit the max ethernet frame size
* + vlan double tagging.
*/
return -EOPNOTSUPP;
}
err = xsk_pool_dma_map(pool, dev, IGC_RX_DMA_ATTR);
if (err) {
netdev_err(ndev, "Failed to map xsk pool\n");
return err;
}
needs_reset = netif_running(adapter->netdev) && igc_xdp_is_enabled(adapter);
rx_ring = adapter->rx_ring[queue_id];
tx_ring = adapter->tx_ring[queue_id];
/* Rx and Tx rings share the same napi context. */
napi = &rx_ring->q_vector->napi;
if (needs_reset) {
igc_disable_rx_ring(rx_ring);
igc_disable_tx_ring(tx_ring);
napi_disable(napi);
}
set_bit(IGC_RING_FLAG_AF_XDP_ZC, &rx_ring->flags);
set_bit(IGC_RING_FLAG_AF_XDP_ZC, &tx_ring->flags);
if (needs_reset) {
napi_enable(napi);
igc_enable_rx_ring(rx_ring);
igc_enable_tx_ring(tx_ring);
err = igc_xsk_wakeup(ndev, queue_id, XDP_WAKEUP_RX);
if (err) {
xsk_pool_dma_unmap(pool, IGC_RX_DMA_ATTR);
return err;
}
}
return 0;
}
static int igc_xdp_disable_pool(struct igc_adapter *adapter, u16 queue_id)
{
struct igc_ring *rx_ring, *tx_ring;
struct xsk_buff_pool *pool;
struct napi_struct *napi;
bool needs_reset;
if (queue_id >= adapter->num_rx_queues ||
queue_id >= adapter->num_tx_queues)
return -EINVAL;
pool = xsk_get_pool_from_qid(adapter->netdev, queue_id);
if (!pool)
return -EINVAL;
needs_reset = netif_running(adapter->netdev) && igc_xdp_is_enabled(adapter);
rx_ring = adapter->rx_ring[queue_id];
tx_ring = adapter->tx_ring[queue_id];
/* Rx and Tx rings share the same napi context. */
napi = &rx_ring->q_vector->napi;
if (needs_reset) {
igc_disable_rx_ring(rx_ring);
igc_disable_tx_ring(tx_ring);
napi_disable(napi);
}
xsk_pool_dma_unmap(pool, IGC_RX_DMA_ATTR);
clear_bit(IGC_RING_FLAG_AF_XDP_ZC, &rx_ring->flags);
clear_bit(IGC_RING_FLAG_AF_XDP_ZC, &tx_ring->flags);
if (needs_reset) {
napi_enable(napi);
igc_enable_rx_ring(rx_ring);
igc_enable_tx_ring(tx_ring);
}
return 0;
}
int igc_xdp_setup_pool(struct igc_adapter *adapter, struct xsk_buff_pool *pool,
u16 queue_id)
{
return pool ? igc_xdp_enable_pool(adapter, pool, queue_id) :
igc_xdp_disable_pool(adapter, queue_id);
}
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