[v6,net-next,4/5] net-device: reorganize net_device fast path variables

Message ID	20231030052550.3157719-5-lixiaoyan@google.com (mailing list archive)
State	Deferred
Delegated to:	Netdev Maintainers
Headers	show Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5BD531C36 for <netdev@vger.kernel.org>; Mon, 30 Oct 2023 05:26:05 +0000 (UTC) Date: Mon, 30 Oct 2023 05:25:49 +0000 In-Reply-To: <20231030052550.3157719-1-lixiaoyan@google.com> Precedence: bulk Mime-Version: 1.0 References: <20231030052550.3157719-1-lixiaoyan@google.com> Message-ID: <20231030052550.3157719-5-lixiaoyan@google.com> Subject: [PATCH v6 net-next 4/5] net-device: reorganize net_device fast path variables From: Coco Li <lixiaoyan@google.com> To: Jakub Kicinski <kuba@kernel.org>, Eric Dumazet <edumazet@google.com>, Neal Cardwell <ncardwell@google.com>, Mubashir Adnan Qureshi <mubashirq@google.com>, Paolo Abeni <pabeni@redhat.com>, Andrew Lunn <andrew@lunn.ch>, Jonathan Corbet <corbet@lwn.net>, David Ahern <dsahern@kernel.org>, Daniel Borkmann <daniel@iogearbox.net> Cc: netdev@vger.kernel.org, Chao Wu <wwchao@google.com>, Wei Wang <weiwan@google.com>, Pradeep Nemavat <pnemavat@google.com>, Coco Li <lixiaoyan@google.com> Content-Type: text/plain; charset="UTF-8"
Series	Analyze and Reorganize core Networking Structs to optimize cacheline consumption \| expand [v6,net-next,0/5] Analyze and Reorganize core Networking Structs to optimize cacheline consumption [v6,net-next,1/5] Documentations: Analyze heavily used Networking related structs [v6,net-next,2/5] cache: enforce cache groups [v6,net-next,3/5] netns-ipv4: reorganize netns_ipv4 fast path variables [v6,net-next,4/5] net-device: reorganize net_device fast path variables [v6,net-next,5/5] tcp: reorganize tcp_sock fast path variables

Context	Check	Description
netdev/series_format	success	Posting correctly formatted
netdev/tree_selection	success	Clearly marked for net-next, async
netdev/fixes_present	success	Fixes tag not required for -next series
netdev/header_inline	success	No static functions without inline keyword in header files
netdev/build_32bit	success	Errors and warnings before: 5499 this patch: 5499
netdev/cc_maintainers	warning	2 maintainers not CCed: bpf@vger.kernel.org davem@davemloft.net
netdev/build_clang	success	Errors and warnings before: 1648 this patch: 1648
netdev/verify_signedoff	success	Signed-off-by tag matches author and committer
netdev/deprecated_api	success	None detected
netdev/check_selftest	success	No net selftest shell script
netdev/verify_fixes	success	No Fixes tag
netdev/build_allmodconfig_warn	success	Errors and warnings before: 5838 this patch: 5838
netdev/checkpatch	warning	WARNING: Missing a blank line after declarations WARNING: line length of 81 exceeds 80 columns WARNING: line length of 82 exceeds 80 columns WARNING: line length of 85 exceeds 80 columns WARNING: line length of 86 exceeds 80 columns WARNING: line length of 87 exceeds 80 columns WARNING: line length of 88 exceeds 80 columns WARNING: line length of 89 exceeds 80 columns WARNING: line length of 90 exceeds 80 columns WARNING: line length of 91 exceeds 80 columns WARNING: line length of 93 exceeds 80 columns WARNING: line length of 94 exceeds 80 columns WARNING: line length of 96 exceeds 80 columns WARNING: line length of 97 exceeds 80 columns WARNING: line length of 99 exceeds 80 columns
netdev/build_clang_rust	success	No Rust files in patch. Skipping build
netdev/kdoc	fail	Errors and warnings before: 0 this patch: 6
netdev/source_inline	success	Was 0 now: 0

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index a16c9cc063fe0..90e2d1ad4f29c 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -2080,6 +2080,70 @@ enum netdev_ml_priv_type { */ struct net_device { + /* Cacheline organization can be found documented in + * Documentation/networking/net_cachelines/net_device.rst. + * Please update the document when adding new fields. + */ + + /* TX read-mostly hotpath */ + __cacheline_group_begin(net_device_read_tx); + unsigned long long priv_flags; + const struct net_device_ops *netdev_ops; + const struct header_ops *header_ops; + struct netdev_queue *_tx; + unsigned int real_num_tx_queues; + unsigned int gso_max_size; + unsigned int gso_ipv4_max_size; + u16 gso_max_segs; + s16 num_tc; + /* Note : dev->mtu is often read without holding a lock. + * Writers usually hold RTNL. + * It is recommended to use READ_ONCE() to annotate the reads, + * and to use WRITE_ONCE() to annotate the writes. + */ + unsigned int mtu; + unsigned short needed_headroom; + struct netdev_tc_txq tc_to_txq[TC_MAX_QUEUE]; +#ifdef CONFIG_XPS + struct xps_dev_maps __rcu *xps_maps[XPS_MAPS_MAX]; +#endif +#ifdef CONFIG_NETFILTER_EGRESS + struct nf_hook_entries __rcu *nf_hooks_egress; +#endif +#ifdef CONFIG_NET_XGRESS + struct bpf_mprog_entry __rcu *tcx_egress; +#endif + __cacheline_group_end(net_device_read_tx); + + /* TXRX read-mostly hotpath */ + __cacheline_group_begin(net_device_read_txrx); + unsigned int flags; + unsigned short hard_header_len; + netdev_features_t features; + struct inet6_dev __rcu *ip6_ptr; + __cacheline_group_end(net_device_read_txrx); + + /* RX read-mostly hotpath */ + __cacheline_group_begin(net_device_read_rx); + struct list_head ptype_specific; + int ifindex; + unsigned int real_num_rx_queues; + struct netdev_rx_queue *_rx; + unsigned long gro_flush_timeout; + int napi_defer_hard_irqs; + unsigned int gro_max_size; + unsigned int gro_ipv4_max_size; + rx_handler_func_t __rcu *rx_handler; + void __rcu *rx_handler_data; + possible_net_t nd_net; +#ifdef CONFIG_NETPOLL + struct netpoll_info __rcu *npinfo; +#endif +#ifdef CONFIG_NET_XGRESS + struct bpf_mprog_entry __rcu *tcx_ingress; +#endif + __cacheline_group_end(net_device_read_rx); + char name[IFNAMSIZ]; struct netdev_name_node *name_node; struct dev_ifalias __rcu *ifalias; @@ -2104,7 +2168,6 @@ struct net_device { struct list_head unreg_list; struct list_head close_list; struct list_head ptype_all; - struct list_head ptype_specific; struct { struct list_head upper; @@ -2112,25 +2175,12 @@ struct net_device { } adj_list; /* Read-mostly cache-line for fast-path access */ - unsigned int flags; xdp_features_t xdp_features; - unsigned long long priv_flags; - const struct net_device_ops *netdev_ops; const struct xdp_metadata_ops *xdp_metadata_ops; - int ifindex; unsigned short gflags; - unsigned short hard_header_len; - /* Note : dev->mtu is often read without holding a lock. - * Writers usually hold RTNL. - * It is recommended to use READ_ONCE() to annotate the reads, - * and to use WRITE_ONCE() to annotate the writes. - */ - unsigned int mtu; - unsigned short needed_headroom; unsigned short needed_tailroom; - netdev_features_t features; netdev_features_t hw_features; netdev_features_t wanted_features; netdev_features_t vlan_features; @@ -2174,8 +2224,6 @@ struct net_device { const struct tlsdev_ops *tlsdev_ops; #endif - const struct header_ops *header_ops; - unsigned char operstate; unsigned char link_mode; @@ -2216,9 +2264,7 @@ struct net_device { /* Protocol-specific pointers */ - struct in_device __rcu *ip_ptr; - struct inet6_dev __rcu *ip6_ptr; #if IS_ENABLED(CONFIG_VLAN_8021Q) struct vlan_info __rcu *vlan_info; #endif @@ -2253,26 +2299,14 @@ struct net_device { /* Interface address info used in eth_type_trans() */ const unsigned char *dev_addr; - struct netdev_rx_queue *_rx; unsigned int num_rx_queues; - unsigned int real_num_rx_queues; - struct bpf_prog __rcu *xdp_prog; - unsigned long gro_flush_timeout; - int napi_defer_hard_irqs; #define GRO_LEGACY_MAX_SIZE 65536u /* TCP minimal MSS is 8 (TCP_MIN_GSO_SIZE), * and shinfo->gso_segs is a 16bit field. */ #define GRO_MAX_SIZE (8 * 65535u) - unsigned int gro_max_size; - unsigned int gro_ipv4_max_size; unsigned int xdp_zc_max_segs; - rx_handler_func_t __rcu *rx_handler; - void __rcu *rx_handler_data; -#ifdef CONFIG_NET_XGRESS - struct bpf_mprog_entry __rcu *tcx_ingress; -#endif struct netdev_queue __rcu *ingress_queue; #ifdef CONFIG_NETFILTER_INGRESS struct nf_hook_entries __rcu *nf_hooks_ingress; @@ -2287,25 +2321,13 @@ struct net_device { /* * Cache lines mostly used on transmit path */ - struct netdev_queue *_tx ____cacheline_aligned_in_smp; unsigned int num_tx_queues; - unsigned int real_num_tx_queues; struct Qdisc __rcu *qdisc; unsigned int tx_queue_len; spinlock_t tx_global_lock; struct xdp_dev_bulk_queue __percpu *xdp_bulkq; -#ifdef CONFIG_XPS - struct xps_dev_maps __rcu *xps_maps[XPS_MAPS_MAX]; -#endif -#ifdef CONFIG_NET_XGRESS - struct bpf_mprog_entry __rcu *tcx_egress; -#endif -#ifdef CONFIG_NETFILTER_EGRESS - struct nf_hook_entries __rcu *nf_hooks_egress; -#endif - #ifdef CONFIG_NET_SCHED DECLARE_HASHTABLE (qdisc_hash, 4); #endif @@ -2344,12 +2366,6 @@ struct net_device { bool needs_free_netdev; void (*priv_destructor)(struct net_device *dev); -#ifdef CONFIG_NETPOLL - struct netpoll_info __rcu *npinfo; -#endif - - possible_net_t nd_net; - /* mid-layer private */ void *ml_priv; enum netdev_ml_priv_type ml_priv_type; @@ -2383,20 +2399,15 @@ struct net_device { */ #define GSO_MAX_SIZE (8 * GSO_MAX_SEGS) - unsigned int gso_max_size; #define TSO_LEGACY_MAX_SIZE 65536 #define TSO_MAX_SIZE UINT_MAX unsigned int tso_max_size; - u16 gso_max_segs; #define TSO_MAX_SEGS U16_MAX u16 tso_max_segs; - unsigned int gso_ipv4_max_size; #ifdef CONFIG_DCB const struct dcbnl_rtnl_ops *dcbnl_ops; #endif - s16 num_tc; - struct netdev_tc_txq tc_to_txq[TC_MAX_QUEUE]; u8 prio_tc_map[TC_BITMASK + 1]; #if IS_ENABLED(CONFIG_FCOE) diff --git a/net/core/dev.c b/net/core/dev.c index 0d548431f3fad..62b8024f07060 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -11513,6 +11513,60 @@ static struct pernet_operations __net_initdata default_device_ops = { .exit_batch = default_device_exit_batch, }; +static void __init net_dev_struct_check(void) +{ + /* TX read-mostly hotpath */ + CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, priv_flags); + CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, netdev_ops); + CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, header_ops); + CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, _tx); + CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, real_num_tx_queues); + CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, gso_max_size); + CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, gso_ipv4_max_size); + CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, gso_max_segs); + CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, num_tc); + CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, mtu); + CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, needed_headroom); + CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, tc_to_txq); +#ifdef CONFIG_XPS + CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, xps_maps); +#endif +#ifdef CONFIG_NETFILTER_EGRESS + CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, nf_hooks_egress); +#endif +#ifdef CONFIG_NET_XGRESS + CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_tx, tcx_egress); +#endif + CACHELINE_ASSERT_GROUP_SIZE(struct net_device, net_device_read_tx, 152); + + /* TXRX read-mostly hotpath */ + CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_txrx, flags); + CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_txrx, hard_header_len); + CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_txrx, features); + CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_txrx, ip6_ptr); + CACHELINE_ASSERT_GROUP_SIZE(struct net_device, net_device_read_txrx, 24); + + /* RX read-mostly hotpath */ + CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, ptype_specific); + CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, ifindex); + CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, real_num_rx_queues); + CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, _rx); + CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, gro_flush_timeout); + CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, napi_defer_hard_irqs); + CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, gro_max_size); + CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, gro_ipv4_max_size); + CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, rx_handler); + CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, rx_handler_data); + CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, nd_net); +#ifdef CONFIG_NETPOLL + CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, npinfo); +#endif +#ifdef CONFIG_NET_XGRESS + CACHELINE_ASSERT_GROUP_MEMBER(struct net_device, net_device_read_rx, tcx_ingress); +#endif + CACHELINE_ASSERT_GROUP_SIZE(struct net_device, net_device_read_rx, 96); +} + /* * Initialize the DEV module. At boot time this walks the device list and * unhooks any devices that fail to initialise (normally hardware not @@ -11530,6 +11584,8 @@ static int __init net_dev_init(void) BUG_ON(!dev_boot_phase); + net_dev_struct_check(); + if (dev_proc_init()) goto out;

[v6,net-next,4/5] net-device: reorganize net_device fast path variables

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