linux/drivers/net/ethernet/sfc/siena/rx.c

// SPDX-License-Identifier: GPL-2.0-only
/****************************************************************************
 * Driver for Solarflare network controllers and boards
 * Copyright 2005-2006 Fen Systems Ltd.
 * Copyright 2005-2013 Solarflare Communications Inc.
 */

#include <linux/socket.h>
#include <linux/in.h>
#include <linux/slab.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/tcp.h>
#include <linux/udp.h>
#include <linux/prefetch.h>
#include <linux/moduleparam.h>
#include <linux/iommu.h>
#include <net/ip.h>
#include <net/checksum.h>
#include <net/xdp.h>
#include <linux/bpf_trace.h>
#include "net_driver.h"
#include "efx.h"
#include "rx_common.h"
#include "filter.h"
#include "nic.h"
#include "selftest.h"
#include "workarounds.h"

/* Preferred number of descriptors to fill at once */
#define EFX_RX_PREFERRED_BATCH …

/* Maximum rx prefix used by any architecture. */
#define EFX_MAX_RX_PREFIX_SIZE …

/* Size of buffer allocated for skb header area. */
#define EFX_SKB_HEADERS …

/* Each packet can consume up to ceil(max_frame_len / buffer_size) buffers */
#define EFX_RX_MAX_FRAGS …

static void efx_rx_packet__check_len(struct efx_rx_queue *rx_queue,
				     struct efx_rx_buffer *rx_buf,
				     int len)
{ … }

/* Allocate and construct an SKB around page fragments */
static struct sk_buff *efx_rx_mk_skb(struct efx_channel *channel,
				     struct efx_rx_buffer *rx_buf,
				     unsigned int n_frags,
				     u8 *eh, int hdr_len)
{ … }

void efx_siena_rx_packet(struct efx_rx_queue *rx_queue, unsigned int index,
			 unsigned int n_frags, unsigned int len, u16 flags)
{ … }

static void efx_rx_deliver(struct efx_channel *channel, u8 *eh,
			   struct efx_rx_buffer *rx_buf,
			   unsigned int n_frags)
{ … }

/** efx_do_xdp: perform XDP processing on a received packet
 *
 * Returns true if packet should still be delivered.
 */
static bool efx_do_xdp(struct efx_nic *efx, struct efx_channel *channel,
		       struct efx_rx_buffer *rx_buf, u8 **ehp)
{ … }

/* Handle a received packet.  Second half: Touches packet payload. */
void __efx_siena_rx_packet(struct efx_channel *channel)
{ … }