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/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
/*
* Copyright 2015-2021 Amazon.com, Inc. or its affiliates. All rights reserved.
*/
#ifndef ENA_XDP_H
#define ENA_XDP_H
#include "ena_netdev.h"
#include <linux/bpf_trace.h>
/* The max MTU size is configured to be the ethernet frame size without
* the overhead of the ethernet header, which can have a VLAN header, and
* a frame check sequence (FCS).
* The buffer size we share with the device is defined to be ENA_PAGE_SIZE
*/
#define ENA_XDP_MAX_MTU (ENA_PAGE_SIZE - ETH_HLEN - ETH_FCS_LEN - \
VLAN_HLEN - XDP_PACKET_HEADROOM - \
SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
#define ENA_IS_XDP_INDEX(adapter, index) (((index) >= (adapter)->xdp_first_ring) && \
((index) < (adapter)->xdp_first_ring + (adapter)->xdp_num_queues))
enum ENA_XDP_ACTIONS {
ENA_XDP_PASS = 0,
ENA_XDP_TX = BIT(0),
ENA_XDP_REDIRECT = BIT(1),
ENA_XDP_DROP = BIT(2)
};
#define ENA_XDP_FORWARDED (ENA_XDP_TX | ENA_XDP_REDIRECT)
int ena_setup_and_create_all_xdp_queues(struct ena_adapter *adapter);
void ena_xdp_exchange_program_rx_in_range(struct ena_adapter *adapter,
struct bpf_prog *prog,
int first, int count);
int ena_xdp_io_poll(struct napi_struct *napi, int budget);
int ena_xdp_xmit_frame(struct ena_ring *tx_ring,
struct ena_adapter *adapter,
struct xdp_frame *xdpf,
int flags);
int ena_xdp_xmit(struct net_device *dev, int n,
struct xdp_frame **frames, u32 flags);
int ena_xdp(struct net_device *netdev, struct netdev_bpf *bpf);
enum ena_xdp_errors_t {
ENA_XDP_ALLOWED = 0,
ENA_XDP_CURRENT_MTU_TOO_LARGE,
ENA_XDP_NO_ENOUGH_QUEUES,
};
static inline bool ena_xdp_present(struct ena_adapter *adapter)
{
return !!adapter->xdp_bpf_prog;
}
static inline bool ena_xdp_present_ring(struct ena_ring *ring)
{
return !!ring->xdp_bpf_prog;
}
static inline bool ena_xdp_legal_queue_count(struct ena_adapter *adapter,
u32 queues)
{
return 2 * queues <= adapter->max_num_io_queues;
}
static inline enum ena_xdp_errors_t ena_xdp_allowed(struct ena_adapter *adapter)
{
enum ena_xdp_errors_t rc = ENA_XDP_ALLOWED;
if (adapter->netdev->mtu > ENA_XDP_MAX_MTU)
rc = ENA_XDP_CURRENT_MTU_TOO_LARGE;
else if (!ena_xdp_legal_queue_count(adapter, adapter->num_io_queues))
rc = ENA_XDP_NO_ENOUGH_QUEUES;
return rc;
}
static inline int ena_xdp_execute(struct ena_ring *rx_ring, struct xdp_buff *xdp)
{
u32 verdict = ENA_XDP_PASS;
struct bpf_prog *xdp_prog;
struct ena_ring *xdp_ring;
struct xdp_frame *xdpf;
u64 *xdp_stat;
xdp_prog = READ_ONCE(rx_ring->xdp_bpf_prog);
verdict = bpf_prog_run_xdp(xdp_prog, xdp);
switch (verdict) {
case XDP_TX:
xdpf = xdp_convert_buff_to_frame(xdp);
if (unlikely(!xdpf)) {
trace_xdp_exception(rx_ring->netdev, xdp_prog, verdict);
xdp_stat = &rx_ring->rx_stats.xdp_aborted;
verdict = ENA_XDP_DROP;
break;
}
/* Find xmit queue */
xdp_ring = rx_ring->xdp_ring;
/* The XDP queues are shared between XDP_TX and XDP_REDIRECT */
spin_lock(&xdp_ring->xdp_tx_lock);
if (ena_xdp_xmit_frame(xdp_ring, rx_ring->adapter, xdpf,
XDP_XMIT_FLUSH))
xdp_return_frame(xdpf);
spin_unlock(&xdp_ring->xdp_tx_lock);
xdp_stat = &rx_ring->rx_stats.xdp_tx;
verdict = ENA_XDP_TX;
break;
case XDP_REDIRECT:
if (likely(!xdp_do_redirect(rx_ring->netdev, xdp, xdp_prog))) {
xdp_stat = &rx_ring->rx_stats.xdp_redirect;
verdict = ENA_XDP_REDIRECT;
break;
}
trace_xdp_exception(rx_ring->netdev, xdp_prog, verdict);
xdp_stat = &rx_ring->rx_stats.xdp_aborted;
verdict = ENA_XDP_DROP;
break;
case XDP_ABORTED:
trace_xdp_exception(rx_ring->netdev, xdp_prog, verdict);
xdp_stat = &rx_ring->rx_stats.xdp_aborted;
verdict = ENA_XDP_DROP;
break;
case XDP_DROP:
xdp_stat = &rx_ring->rx_stats.xdp_drop;
verdict = ENA_XDP_DROP;
break;
case XDP_PASS:
xdp_stat = &rx_ring->rx_stats.xdp_pass;
verdict = ENA_XDP_PASS;
break;
default:
bpf_warn_invalid_xdp_action(rx_ring->netdev, xdp_prog, verdict);
xdp_stat = &rx_ring->rx_stats.xdp_invalid;
verdict = ENA_XDP_DROP;
}
ena_increase_stat(xdp_stat, 1, &rx_ring->syncp);
return verdict;
}
#endif /* ENA_XDP_H */
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