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// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2022 Gerhard Engleder <gerhard@engleder-embedded.com> */
#include <linux/if_vlan.h>
#include <net/xdp_sock_drv.h>
#include "tsnep.h"
int tsnep_xdp_setup_prog(struct tsnep_adapter *adapter, struct bpf_prog *prog,
struct netlink_ext_ack *extack)
{
struct bpf_prog *old_prog;
old_prog = xchg(&adapter->xdp_prog, prog);
if (old_prog)
bpf_prog_put(old_prog);
return 0;
}
static int tsnep_xdp_enable_pool(struct tsnep_adapter *adapter,
struct xsk_buff_pool *pool, u16 queue_id)
{
struct tsnep_queue *queue;
int retval;
if (queue_id >= adapter->num_rx_queues ||
queue_id >= adapter->num_tx_queues)
return -EINVAL;
queue = &adapter->queue[queue_id];
if (queue->rx->queue_index != queue_id ||
queue->tx->queue_index != queue_id) {
netdev_err(adapter->netdev,
"XSK support only for TX/RX queue pairs\n");
return -EOPNOTSUPP;
}
retval = xsk_pool_dma_map(pool, adapter->dmadev,
DMA_ATTR_SKIP_CPU_SYNC);
if (retval) {
netdev_err(adapter->netdev, "failed to map XSK pool\n");
return retval;
}
retval = tsnep_enable_xsk(queue, pool);
if (retval) {
xsk_pool_dma_unmap(pool, DMA_ATTR_SKIP_CPU_SYNC);
return retval;
}
return 0;
}
static int tsnep_xdp_disable_pool(struct tsnep_adapter *adapter, u16 queue_id)
{
struct xsk_buff_pool *pool;
struct tsnep_queue *queue;
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;
queue = &adapter->queue[queue_id];
tsnep_disable_xsk(queue);
xsk_pool_dma_unmap(pool, DMA_ATTR_SKIP_CPU_SYNC);
return 0;
}
int tsnep_xdp_setup_pool(struct tsnep_adapter *adapter,
struct xsk_buff_pool *pool, u16 queue_id)
{
return pool ? tsnep_xdp_enable_pool(adapter, pool, queue_id) :
tsnep_xdp_disable_pool(adapter, queue_id);
}
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