linux-imx

/* A network driver using virtio.

 *

 * Copyright 2007 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, see <http://www.gnu.org/licenses/>.

 */

//#define DEBUG

#include <linux/netdevice.h>

#include <linux/etherdevice.h>

#include <linux/ethtool.h>

#include <linux/module.h>

#include <linux/virtio.h>

#include <linux/virtio_net.h>

#include <linux/bpf.h>

#include <linux/bpf_trace.h>

#include <linux/scatterlist.h>

#include <linux/if_vlan.h>

#include <linux/slab.h>

#include <linux/cpu.h>

#include <linux/average.h>

#include <linux/filter.h>

#include <linux/kernel.h>

#include <linux/pci.h>

#include <net/route.h>

#include <net/xdp.h>

#include <net/net_failover.h>

​

static int napi_weight = NAPI_POLL_WEIGHT;

module_param(napi_weight, int, 0444);

​

static bool csum = true, gso = true, napi_tx;

module_param(csum, bool, 0444);

module_param(gso, bool, 0444);

module_param(napi_tx, bool, 0644);

​

/* FIXME: MTU in config. */

#define GOOD_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN)

#define GOOD_COPY_LEN   128

​

#define VIRTNET_RX_PAD (NET_IP_ALIGN + NET_SKB_PAD)

​

/* Amount of XDP headroom to prepend to packets for use by xdp_adjust_head */

#define VIRTIO_XDP_HEADROOM 256

​

/* Separating two types of XDP xmit */

#define VIRTIO_XDP_TX       BIT(0)

#define VIRTIO_XDP_REDIR    BIT(1)

​

#define VIRTIO_XDP_FLAG BIT(0)

​

/* RX packet size EWMA. The average packet size is used to determine the packet

 * buffer size when refilling RX rings. As the entire RX ring may be refilled

 * at once, the weight is chosen so that the EWMA will be insensitive to short-

 * term, transient changes in packet size.

 */

DECLARE_EWMA(pkt_len, 0, 64)

​

#define VIRTNET_DRIVER_VERSION "1.0.0"

​

static const unsigned long guest_offloads[] = {

    VIRTIO_NET_F_GUEST_TSO4,

    VIRTIO_NET_F_GUEST_TSO6,

    VIRTIO_NET_F_GUEST_ECN,

    VIRTIO_NET_F_GUEST_UFO,

    VIRTIO_NET_F_GUEST_CSUM

};

​

struct virtnet_stat_desc {

    char desc[ETH_GSTRING_LEN];

    size_t offset;

};

​

struct virtnet_sq_stats {

    struct u64_stats_sync syncp;

    u64 packets;

    u64 bytes;

    u64 xdp_tx;

    u64 xdp_tx_drops;

    u64 kicks;

};

​