On Thu, Feb 02, 2023 at 07:00:40PM +0800, Xuan Zhuo
wrote:> Move some structure definitions and inline functions into the
> virtio_net.h file.
>
> Signed-off-by: Xuan Zhuo <xuanzhuo at linux.alibaba.com>
> ---
> drivers/net/virtio/main.c | 247 +----------------------------
> drivers/net/virtio/virtio_net.h | 265 ++++++++++++++++++++++++++++++++
> 2 files changed, 267 insertions(+), 245 deletions(-)
> create mode 100644 drivers/net/virtio/virtio_net.h
>
> diff --git a/drivers/net/virtio/main.c b/drivers/net/virtio/main.c
> index eb7f00194b5c..5683cb576474 100644
> --- a/drivers/net/virtio/main.c
> +++ b/drivers/net/virtio/main.c
> @@ -4,24 +4,8 @@
> * Copyright 2007 Rusty Russell <rusty at rustcorp.com.au> IBM
Corporation
> */
> //#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 <net/route.h>
> -#include <net/xdp.h>
> -#include <net/net_failover.h>
> +
> +#include "virtio_net.h"
>
> static int napi_weight = NAPI_POLL_WEIGHT;
> module_param(napi_weight, int, 0444);
You should only move the headers that are actually needed not
everything.
> @@ -44,15 +28,6 @@ module_param(napi_tx, bool, 0644);
> #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[] = {
> @@ -72,36 +47,6 @@ static const unsigned long guest_offloads[] = {
> (1ULL << VIRTIO_NET_F_GUEST_USO4) | \
> (1ULL << VIRTIO_NET_F_GUEST_USO6))
>
> -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;
> - u64 tx_timeouts;
> -};
> -
> -struct virtnet_rq_stats {
> - struct u64_stats_sync syncp;
> - u64 packets;
> - u64 bytes;
> - u64 drops;
> - u64 xdp_packets;
> - u64 xdp_tx;
> - u64 xdp_redirects;
> - u64 xdp_drops;
> - u64 kicks;
> -};
> -
> -#define VIRTNET_SQ_STAT(m) offsetof(struct virtnet_sq_stats, m)
> -#define VIRTNET_RQ_STAT(m) offsetof(struct virtnet_rq_stats, m)
> -
> static const struct virtnet_stat_desc virtnet_sq_stats_desc[] = {
> { "packets", VIRTNET_SQ_STAT(packets) },
> { "bytes", VIRTNET_SQ_STAT(bytes) },
> @@ -125,57 +70,6 @@ static const struct virtnet_stat_desc
virtnet_rq_stats_desc[] = {
> #define VIRTNET_SQ_STATS_LEN ARRAY_SIZE(virtnet_sq_stats_desc)
> #define VIRTNET_RQ_STATS_LEN ARRAY_SIZE(virtnet_rq_stats_desc)
>
> -/* Internal representation of a send virtqueue */
> -struct send_queue {
> - /* Virtqueue associated with this send _queue */
> - struct virtqueue *vq;
> -
> - /* TX: fragments + linear part + virtio header */
> - struct scatterlist sg[MAX_SKB_FRAGS + 2];
> -
> - /* Name of the send queue: output.$index */
> - char name[16];
> -
> - struct virtnet_sq_stats stats;
> -
> - struct napi_struct napi;
> -
> - /* Record whether sq is in reset state. */
> - bool reset;
> -};
> -
> -/* Internal representation of a receive virtqueue */
> -struct receive_queue {
> - /* Virtqueue associated with this receive_queue */
> - struct virtqueue *vq;
> -
> - struct napi_struct napi;
> -
> - struct bpf_prog __rcu *xdp_prog;
> -
> - struct virtnet_rq_stats stats;
> -
> - /* Chain pages by the private ptr. */
> - struct page *pages;
> -
> - /* Average packet length for mergeable receive buffers. */
> - struct ewma_pkt_len mrg_avg_pkt_len;
> -
> - /* Page frag for packet buffer allocation. */
> - struct page_frag alloc_frag;
> -
> - /* RX: fragments + linear part + virtio header */
> - struct scatterlist sg[MAX_SKB_FRAGS + 2];
> -
> - /* Min single buffer size for mergeable buffers case. */
> - unsigned int min_buf_len;
> -
> - /* Name of this receive queue: input.$index */
> - char name[16];
> -
> - struct xdp_rxq_info xdp_rxq;
> -};
> -
> /* This structure can contain rss message with maximum settings for
indirection table and keysize
> * Note, that default structure that describes RSS configuration
virtio_net_rss_config
> * contains same info but can't handle table values.
> @@ -206,90 +100,6 @@ struct control_buf {
> struct virtio_net_ctrl_rss rss;
> };
>
> -struct virtnet_info {
> - struct virtio_device *vdev;
> - struct virtqueue *cvq;
> - struct net_device *dev;
> - struct send_queue *sq;
> - struct receive_queue *rq;
> - unsigned int status;
> -
> - /* Max # of queue pairs supported by the device */
> - u16 max_queue_pairs;
> -
> - /* # of queue pairs currently used by the driver */
> - u16 curr_queue_pairs;
> -
> - /* # of XDP queue pairs currently used by the driver */
> - u16 xdp_queue_pairs;
> -
> - /* xdp_queue_pairs may be 0, when xdp is already loaded. So add this. */
> - bool xdp_enabled;
> -
> - /* I like... big packets and I cannot lie! */
> - bool big_packets;
> -
> - /* number of sg entries allocated for big packets */
> - unsigned int big_packets_num_skbfrags;
> -
> - /* Host will merge rx buffers for big packets (shake it! shake it!) */
> - bool mergeable_rx_bufs;
> -
> - /* Host supports rss and/or hash report */
> - bool has_rss;
> - bool has_rss_hash_report;
> - u8 rss_key_size;
> - u16 rss_indir_table_size;
> - u32 rss_hash_types_supported;
> - u32 rss_hash_types_saved;
> -
> - /* Has control virtqueue */
> - bool has_cvq;
> -
> - /* Host can handle any s/g split between our header and packet data */
> - bool any_header_sg;
> -
> - /* Packet virtio header size */
> - u8 hdr_len;
> -
> - /* Work struct for delayed refilling if we run low on memory. */
> - struct delayed_work refill;
> -
> - /* Is delayed refill enabled? */
> - bool refill_enabled;
> -
> - /* The lock to synchronize the access to refill_enabled */
> - spinlock_t refill_lock;
> -
> - /* Work struct for config space updates */
> - struct work_struct config_work;
> -
> - /* Does the affinity hint is set for virtqueues? */
> - bool affinity_hint_set;
> -
> - /* CPU hotplug instances for online & dead */
> - struct hlist_node node;
> - struct hlist_node node_dead;
> -
> - struct control_buf *ctrl;
> -
> - /* Ethtool settings */
> - u8 duplex;
> - u32 speed;
> -
> - /* Interrupt coalescing settings */
> - u32 tx_usecs;
> - u32 rx_usecs;
> - u32 tx_max_packets;
> - u32 rx_max_packets;
> -
> - unsigned long guest_offloads;
> - unsigned long guest_offloads_capable;
> -
> - /* failover when STANDBY feature enabled */
> - struct failover *failover;
> -};
> -
> struct padded_vnet_hdr {
> struct virtio_net_hdr_v1_hash hdr;
> /*
> @@ -303,45 +113,11 @@ struct padded_vnet_hdr {
> static void virtnet_rq_free_unused_buf(struct virtqueue *vq, void *buf);
> static void virtnet_sq_free_unused_buf(struct virtqueue *vq, void *buf);
>
> -static bool is_xdp_frame(void *ptr)
> -{
> - return (unsigned long)ptr & VIRTIO_XDP_FLAG;
> -}
> -
> static void *xdp_to_ptr(struct xdp_frame *ptr)
> {
> return (void *)((unsigned long)ptr | VIRTIO_XDP_FLAG);
> }
>
> -static struct xdp_frame *ptr_to_xdp(void *ptr)
> -{
> - return (struct xdp_frame *)((unsigned long)ptr & ~VIRTIO_XDP_FLAG);
> -}
> -
> -static void __free_old_xmit(struct send_queue *sq, bool in_napi,
> - struct virtnet_sq_stats *stats)
> -{
> - unsigned int len;
> - void *ptr;
> -
> - while ((ptr = virtqueue_get_buf(sq->vq, &len)) != NULL) {
> - if (!is_xdp_frame(ptr)) {
> - struct sk_buff *skb = ptr;
> -
> - pr_debug("Sent skb %p\n", skb);
> -
> - stats->bytes += skb->len;
> - napi_consume_skb(skb, in_napi);
> - } else {
> - struct xdp_frame *frame = ptr_to_xdp(ptr);
> -
> - stats->bytes += xdp_get_frame_len(frame);
> - xdp_return_frame(frame);
> - }
> - stats->packets++;
> - }
> -}
> -
> /* Converting between virtqueue no. and kernel tx/rx queue no.
> * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq
> */
> @@ -411,15 +187,6 @@ static void disable_delayed_refill(struct virtnet_info
*vi)
> spin_unlock_bh(&vi->refill_lock);
> }
>
> -static void virtqueue_napi_schedule(struct napi_struct *napi,
> - struct virtqueue *vq)
> -{
> - if (napi_schedule_prep(napi)) {
> - virtqueue_disable_cb(vq);
> - __napi_schedule(napi);
> - }
> -}
> -
> static void virtqueue_napi_complete(struct napi_struct *napi,
> struct virtqueue *vq, int processed)
> {
> @@ -1740,16 +1507,6 @@ static void free_old_xmit(struct send_queue *sq,
bool in_napi)
> u64_stats_update_end(&sq->stats.syncp);
> }
>
> -static bool is_xdp_raw_buffer_queue(struct virtnet_info *vi, int q)
> -{
> - if (q < (vi->curr_queue_pairs - vi->xdp_queue_pairs))
> - return false;
> - else if (q < vi->curr_queue_pairs)
> - return true;
> - else
> - return false;
> -}
> -
> static void virtnet_poll_cleantx(struct receive_queue *rq)
> {
> struct virtnet_info *vi = rq->vq->vdev->priv;
> diff --git a/drivers/net/virtio/virtio_net.h
b/drivers/net/virtio/virtio_net.h
> new file mode 100644
> index 000000000000..8bf31429ae28
> --- /dev/null
> +++ b/drivers/net/virtio/virtio_net.h
> @@ -0,0 +1,265 @@
> +/* SPDX-License-Identifier: GPL-2.0-or-later */
> +
> +#ifndef __VIRTIO_NET_H__
> +#define __VIRTIO_NET_H__
> +#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 <net/route.h>
> +#include <net/xdp.h>
> +#include <net/net_failover.h>
> +#include <net/xdp_sock_drv.h>
> +
> +#define VIRTIO_XDP_FLAG BIT(0)
> +
> +struct virtnet_info {
> + struct virtio_device *vdev;
> + struct virtqueue *cvq;
> + struct net_device *dev;
> + struct send_queue *sq;
> + struct receive_queue *rq;
> + unsigned int status;
> +
> + /* Max # of queue pairs supported by the device */
> + u16 max_queue_pairs;
> +
> + /* # of queue pairs currently used by the driver */
> + u16 curr_queue_pairs;
> +
> + /* # of XDP queue pairs currently used by the driver */
> + u16 xdp_queue_pairs;
> +
> + /* xdp_queue_pairs may be 0, when xdp is already loaded. So add this. */
> + bool xdp_enabled;
> +
> + /* I like... big packets and I cannot lie! */
> + bool big_packets;
> +
> + /* number of sg entries allocated for big packets */
> + unsigned int big_packets_num_skbfrags;
> +
> + /* Host will merge rx buffers for big packets (shake it! shake it!) */
> + bool mergeable_rx_bufs;
> +
> + /* Host supports rss and/or hash report */
> + bool has_rss;
> + bool has_rss_hash_report;
> + u8 rss_key_size;
> + u16 rss_indir_table_size;
> + u32 rss_hash_types_supported;
> + u32 rss_hash_types_saved;
> +
> + /* Has control virtqueue */
> + bool has_cvq;
> +
> + /* Host can handle any s/g split between our header and packet data */
> + bool any_header_sg;
> +
> + /* Packet virtio header size */
> + u8 hdr_len;
> +
> + /* Work struct for delayed refilling if we run low on memory. */
> + struct delayed_work refill;
> +
> + /* Is delayed refill enabled? */
> + bool refill_enabled;
> +
> + /* The lock to synchronize the access to refill_enabled */
> + spinlock_t refill_lock;
> +
> + /* Work struct for config space updates */
> + struct work_struct config_work;
> +
> + /* Does the affinity hint is set for virtqueues? */
> + bool affinity_hint_set;
> +
> + /* CPU hotplug instances for online & dead */
> + struct hlist_node node;
> + struct hlist_node node_dead;
> +
> + struct control_buf *ctrl;
> +
> + /* Ethtool settings */
> + u8 duplex;
> + u32 speed;
> +
> + /* Interrupt coalescing settings */
> + u32 tx_usecs;
> + u32 rx_usecs;
> + u32 tx_max_packets;
> + u32 rx_max_packets;
> +
> + unsigned long guest_offloads;
> + unsigned long guest_offloads_capable;
> +
> + /* failover when STANDBY feature enabled */
> + struct failover *failover;
> +};
> +
> +/* 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)
> +
> +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;
> + u64 tx_timeouts;
> +};
> +
> +struct virtnet_rq_stats {
> + struct u64_stats_sync syncp;
> + u64 packets;
> + u64 bytes;
> + u64 drops;
> + u64 xdp_packets;
> + u64 xdp_tx;
> + u64 xdp_redirects;
> + u64 xdp_drops;
> + u64 kicks;
> +};
> +
> +#define VIRTNET_SQ_STAT(m) offsetof(struct virtnet_sq_stats, m)
> +#define VIRTNET_RQ_STAT(m) offsetof(struct virtnet_rq_stats, m)
> +
> +/* Internal representation of a send virtqueue */
> +struct send_queue {
> + /* Virtqueue associated with this send _queue */
> + struct virtqueue *vq;
> +
> + /* TX: fragments + linear part + virtio header */
> + struct scatterlist sg[MAX_SKB_FRAGS + 2];
> +
> + /* Name of the send queue: output.$index */
> + char name[16];
> +
> + struct virtnet_sq_stats stats;
> +
> + struct napi_struct napi;
> +
> + /* Record whether sq is in reset state. */
> + bool reset;
> +};
> +
> +/* Internal representation of a receive virtqueue */
> +struct receive_queue {
> + /* Virtqueue associated with this receive_queue */
> + struct virtqueue *vq;
> +
> + struct napi_struct napi;
> +
> + struct bpf_prog __rcu *xdp_prog;
> +
> + struct virtnet_rq_stats stats;
> +
> + /* Chain pages by the private ptr. */
> + struct page *pages;
> +
> + /* Average packet length for mergeable receive buffers. */
> + struct ewma_pkt_len mrg_avg_pkt_len;
> +
> + /* Page frag for packet buffer allocation. */
> + struct page_frag alloc_frag;
> +
> + /* RX: fragments + linear part + virtio header */
> + struct scatterlist sg[MAX_SKB_FRAGS + 2];
> +
> + /* Min single buffer size for mergeable buffers case. */
> + unsigned int min_buf_len;
> +
> + /* Name of this receive queue: input.$index */
> + char name[16];
> +
> + struct xdp_rxq_info xdp_rxq;
> +};
> +
> +static inline bool is_xdp_raw_buffer_queue(struct virtnet_info *vi, int q)
> +{
> + if (q < (vi->curr_queue_pairs - vi->xdp_queue_pairs))
> + return false;
> + else if (q < vi->curr_queue_pairs)
> + return true;
> + else
> + return false;
> +}
> +
> +static inline void virtnet_return_xdp_frame(struct send_queue *sq,
> + struct xdp_frame *frame)
> +{
> + struct virtnet_info *vi = sq->vq->vdev->priv;
> + dma_addr_t *p_addr, addr;
> +
> + p_addr = frame->data - sizeof(*p_addr);
> + addr = *p_addr;
> +
> + virtio_dma_unmap(&vi->vdev->dev, addr, frame->len,
DMA_TO_DEVICE);
> +
> + xdp_return_frame(frame);
> +}
> +
> +static inline void virtqueue_napi_schedule(struct napi_struct *napi,
> + struct virtqueue *vq)
> +{
> + if (napi_schedule_prep(napi)) {
> + virtqueue_disable_cb(vq);
> + __napi_schedule(napi);
> + }
> +}
> +
> +static inline bool is_xdp_frame(void *ptr)
> +{
> + return (unsigned long)ptr & VIRTIO_XDP_FLAG;
> +}
> +
> +static struct xdp_frame *ptr_to_xdp(void *ptr)
> +{
> + return (struct xdp_frame *)((unsigned long)ptr & ~VIRTIO_XDP_FLAG);
> +}
> +
> +static void __free_old_xmit(struct send_queue *sq, bool in_napi,
> + struct virtnet_sq_stats *stats)
> +{
> + unsigned int len;
> + void *ptr;
> +
> + while ((ptr = virtqueue_get_buf(sq->vq, &len)) != NULL) {
> + if (!is_xdp_frame(ptr)) {
> + struct sk_buff *skb = ptr;
> +
> + pr_debug("Sent skb %p\n", skb);
> +
> + stats->bytes += skb->len;
> + napi_consume_skb(skb, in_napi);
> + } else {
> + struct xdp_frame *frame = ptr_to_xdp(ptr);
> +
> + stats->bytes += xdp_get_frame_len(frame);
> + xdp_return_frame(frame);
> + }
> + stats->packets++;
> + }
> +}
> +#endif
All these APIs not prefixed with virtnet were ok as internal
static functions. No longer ok in a header.
> --
> 2.32.0.3.g01195cf9f