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Date: Wed, 2 Aug 2023 12:42:51 -0700
From: "Nambiar, Amritha" <amritha.nambiar@...el.com>
To: Jakub Kicinski <kuba@...nel.org>, <ast@...nel.org>
CC: <netdev@...r.kernel.org>, <bpf@...r.kernel.org>, <hawk@...nel.org>,
<aleksander.lobakin@...el.com>, <mst@...hat.com>, <jasowang@...hat.com>,
<xuanzhuo@...ux.alibaba.com>, <daniel@...earbox.net>, <andrii@...nel.org>,
<martin.lau@...ux.dev>, <song@...nel.org>, <yonghong.song@...ux.dev>,
<john.fastabend@...il.com>, <kpsingh@...nel.org>, <sdf@...gle.com>,
<haoluo@...gle.com>, <jolsa@...nel.org>, <bjorn@...nel.org>,
<magnus.karlsson@...el.com>, <maciej.fijalkowski@...el.com>,
<jonathan.lemon@...il.com>, <gregkh@...uxfoundation.org>,
<wangyufen@...wei.com>, <virtualization@...ts.linux-foundation.org>
Subject: Re: [PATCH bpf-next 2/3] net: move struct netdev_rx_queue out of
netdevice.h
On 8/1/2023 5:32 PM, Jakub Kicinski wrote:
> struct netdev_rx_queue is touched in only a few places
> and having it defined in netdevice.h brings in the dependency
> on xdp.h, because struct xdp_rxq_info gets embedded in
> struct netdev_rx_queue.
>
> In prep for removal of xdp.h from netdevice.h move all
> the netdev_rx_queue stuff to a new header.
>
> We could technically break the new header up to avoid
> the sysfs.h include but it's so rarely included it
> doesn't seem to be worth it at this point.
>
> Signed-off-by: Jakub Kicinski <kuba@...nel.org>
> ---
> CC: mst@...hat.com
> CC: jasowang@...hat.com
> CC: xuanzhuo@...ux.alibaba.com
> CC: ast@...nel.org
> CC: daniel@...earbox.net
> CC: andrii@...nel.org
> CC: martin.lau@...ux.dev
> CC: song@...nel.org
> CC: yonghong.song@...ux.dev
> CC: john.fastabend@...il.com
> CC: kpsingh@...nel.org
> CC: sdf@...gle.com
> CC: haoluo@...gle.com
> CC: jolsa@...nel.org
> CC: bjorn@...nel.org
> CC: magnus.karlsson@...el.com
> CC: maciej.fijalkowski@...el.com
> CC: jonathan.lemon@...il.com
> CC: hawk@...nel.org
> CC: gregkh@...uxfoundation.org
> CC: wangyufen@...wei.com
> CC: virtualization@...ts.linux-foundation.org
> CC: bpf@...r.kernel.org
> ---
> drivers/net/virtio_net.c | 1 +
> include/linux/netdevice.h | 44 -----------------------------
> include/net/netdev_rx_queue.h | 53 +++++++++++++++++++++++++++++++++++
> net/bpf/test_run.c | 1 +
> net/core/dev.c | 1 +
> net/core/net-sysfs.c | 1 +
> net/xdp/xsk.c | 1 +
> 7 files changed, 58 insertions(+), 44 deletions(-)
> create mode 100644 include/net/netdev_rx_queue.h
>
Reviewed-by: Amritha Nambiar <amritha.nambiar@...el.com>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 0db14f6b87d3..5bcfd69333ea 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -22,6 +22,7 @@
> #include <net/route.h>
> #include <net/xdp.h>
> #include <net/net_failover.h>
> +#include <net/netdev_rx_queue.h>
>
> static int napi_weight = NAPI_POLL_WEIGHT;
> module_param(napi_weight, int, 0444);
> diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> index 3800d0479698..5563c8a210b5 100644
> --- a/include/linux/netdevice.h
> +++ b/include/linux/netdevice.h
> @@ -782,32 +782,6 @@ bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index, u32 flow_id,
> #endif
> #endif /* CONFIG_RPS */
>
> -/* This structure contains an instance of an RX queue. */
> -struct netdev_rx_queue {
> - struct xdp_rxq_info xdp_rxq;
> -#ifdef CONFIG_RPS
> - struct rps_map __rcu *rps_map;
> - struct rps_dev_flow_table __rcu *rps_flow_table;
> -#endif
> - struct kobject kobj;
> - struct net_device *dev;
> - netdevice_tracker dev_tracker;
> -
> -#ifdef CONFIG_XDP_SOCKETS
> - struct xsk_buff_pool *pool;
> -#endif
> -} ____cacheline_aligned_in_smp;
> -
> -/*
> - * RX queue sysfs structures and functions.
> - */
> -struct rx_queue_attribute {
> - struct attribute attr;
> - ssize_t (*show)(struct netdev_rx_queue *queue, char *buf);
> - ssize_t (*store)(struct netdev_rx_queue *queue,
> - const char *buf, size_t len);
> -};
> -
> /* XPS map type and offset of the xps map within net_device->xps_maps[]. */
> enum xps_map_type {
> XPS_CPUS = 0,
> @@ -3828,24 +3802,6 @@ static inline int netif_set_real_num_rx_queues(struct net_device *dev,
> int netif_set_real_num_queues(struct net_device *dev,
> unsigned int txq, unsigned int rxq);
>
> -static inline struct netdev_rx_queue *
> -__netif_get_rx_queue(struct net_device *dev, unsigned int rxq)
> -{
> - return dev->_rx + rxq;
> -}
> -
> -#ifdef CONFIG_SYSFS
> -static inline unsigned int get_netdev_rx_queue_index(
> - struct netdev_rx_queue *queue)
> -{
> - struct net_device *dev = queue->dev;
> - int index = queue - dev->_rx;
> -
> - BUG_ON(index >= dev->num_rx_queues);
> - return index;
> -}
> -#endif
> -
> int netif_get_num_default_rss_queues(void);
>
> void dev_kfree_skb_irq_reason(struct sk_buff *skb, enum skb_drop_reason reason);
> diff --git a/include/net/netdev_rx_queue.h b/include/net/netdev_rx_queue.h
> new file mode 100644
> index 000000000000..cdcafb30d437
> --- /dev/null
> +++ b/include/net/netdev_rx_queue.h
> @@ -0,0 +1,53 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef _LINUX_NETDEV_RX_QUEUE_H
> +#define _LINUX_NETDEV_RX_QUEUE_H
> +
> +#include <linux/kobject.h>
> +#include <linux/netdevice.h>
> +#include <linux/sysfs.h>
> +#include <net/xdp.h>
> +
> +/* This structure contains an instance of an RX queue. */
> +struct netdev_rx_queue {
> + struct xdp_rxq_info xdp_rxq;
> +#ifdef CONFIG_RPS
> + struct rps_map __rcu *rps_map;
> + struct rps_dev_flow_table __rcu *rps_flow_table;
> +#endif
> + struct kobject kobj;
> + struct net_device *dev;
> + netdevice_tracker dev_tracker;
> +
> +#ifdef CONFIG_XDP_SOCKETS
> + struct xsk_buff_pool *pool;
> +#endif
> +} ____cacheline_aligned_in_smp;
> +
> +/*
> + * RX queue sysfs structures and functions.
> + */
> +struct rx_queue_attribute {
> + struct attribute attr;
> + ssize_t (*show)(struct netdev_rx_queue *queue, char *buf);
> + ssize_t (*store)(struct netdev_rx_queue *queue,
> + const char *buf, size_t len);
> +};
> +
> +static inline struct netdev_rx_queue *
> +__netif_get_rx_queue(struct net_device *dev, unsigned int rxq)
> +{
> + return dev->_rx + rxq;
> +}
> +
> +#ifdef CONFIG_SYSFS
> +static inline unsigned int
> +get_netdev_rx_queue_index(struct netdev_rx_queue *queue)
> +{
> + struct net_device *dev = queue->dev;
> + int index = queue - dev->_rx;
> +
> + BUG_ON(index >= dev->num_rx_queues);
> + return index;
> +}
> +#endif
> +#endif
> diff --git a/net/bpf/test_run.c b/net/bpf/test_run.c
> index 7d47f53f20c1..4ed68141d9a3 100644
> --- a/net/bpf/test_run.c
> +++ b/net/bpf/test_run.c
> @@ -21,6 +21,7 @@
> #include <linux/sock_diag.h>
> #include <linux/netfilter.h>
> #include <net/xdp.h>
> +#include <net/netdev_rx_queue.h>
> #include <net/netfilter/nf_bpf_link.h>
>
> #define CREATE_TRACE_POINTS
> diff --git a/net/core/dev.c b/net/core/dev.c
> index 8e7d0cb540cd..1fee2372b633 100644
> --- a/net/core/dev.c
> +++ b/net/core/dev.c
> @@ -151,6 +151,7 @@
> #include <linux/pm_runtime.h>
> #include <linux/prandom.h>
> #include <linux/once_lite.h>
> +#include <net/netdev_rx_queue.h>
>
> #include "dev.h"
> #include "net-sysfs.h"
> diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
> index 15e3f4606b5f..fccaa5bac0ed 100644
> --- a/net/core/net-sysfs.c
> +++ b/net/core/net-sysfs.c
> @@ -23,6 +23,7 @@
> #include <linux/of.h>
> #include <linux/of_net.h>
> #include <linux/cpu.h>
> +#include <net/netdev_rx_queue.h>
>
> #include "dev.h"
> #include "net-sysfs.h"
> diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c
> index 4f1e0599146e..82aaec1b079f 100644
> --- a/net/xdp/xsk.c
> +++ b/net/xdp/xsk.c
> @@ -25,6 +25,7 @@
> #include <linux/vmalloc.h>
> #include <net/xdp_sock_drv.h>
> #include <net/busy_poll.h>
> +#include <net/netdev_rx_queue.h>
> #include <net/xdp.h>
>
> #include "xsk_queue.h"
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