netdev - [PATCH net 1/3] tcp: move tp->scaling_ratio to tcp_sock_read

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Date: Thu,  8 Feb 2024 14:43:21 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org, Naman Gulati <namangulati@...gle.com>, 
	Coco Li <lixiaoyan@...gle.com>, Wei Wang <weiwan@...gle.com>, eric.dumazet@...il.com, 
	Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net 1/3] tcp: move tp->scaling_ratio to tcp_sock_read_txrx group

tp->scaling_ratio is a read mostly field, used in rx and tx fast paths.

Fixes: d5fed5addb2b ("tcp: reorganize tcp_sock fast path variables")
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: Coco Li <lixiaoyan@...gle.com>
Cc: Wei Wang <weiwan@...gle.com>
---
 Documentation/networking/net_cachelines/tcp_sock.rst | 2 +-
 include/linux/tcp.h                                  | 2 +-
 net/ipv4/tcp.c                                       | 3 ++-
 3 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/Documentation/networking/net_cachelines/tcp_sock.rst b/Documentation/networking/net_cachelines/tcp_sock.rst
index 97d7a5c8e01c02658c7f445ed92a2d1f7cc61d31..80391229147971005571f9a9a4fcdcf4e50089da 100644
--- a/Documentation/networking/net_cachelines/tcp_sock.rst
+++ b/Documentation/networking/net_cachelines/tcp_sock.rst
@@ -38,7 +38,7 @@ u32                           max_window              read_mostly         -
 u32                           mss_cache               read_mostly         read_mostly         tcp_rate_check_app_limited,tcp_current_mss,tcp_sync_mss,tcp_sndbuf_expand,tcp_tso_should_defer(tx);tcp_update_pacing_rate,tcp_clean_rtx_queue(rx)
 u32                           window_clamp            read_mostly         read_write          tcp_rcv_space_adjust,__tcp_select_window
 u32                           rcv_ssthresh            read_mostly         -                   __tcp_select_window
-u82                           scaling_ratio                                                   
+u8                            scaling_ratio           read_mostly         read_mostly         tcp_win_from_space
 struct                        tcp_rack                                                        
 u16                           advmss                  -                   read_mostly         tcp_rcv_space_adjust
 u8                            compressed_ack                                                  
diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index 89b290d8c8dc9f115df7a295bc8d2512698db169..168f5dca66096589e7a213ffd6742a51fe43b4a9 100644
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h
@@ -221,6 +221,7 @@ struct tcp_sock {
 	u32	lost_out;	/* Lost packets			*/
 	u32	sacked_out;	/* SACK'd packets			*/
 	u16	tcp_header_len;	/* Bytes of tcp header to send		*/
+	u8	scaling_ratio;	/* see tcp_win_from_space() */
 	u8	chrono_type : 2,	/* current chronograph type */
 		repair      : 1,
 		is_sack_reneg:1,    /* in recovery from loss with SACK reneg? */
@@ -352,7 +353,6 @@ struct tcp_sock {
 	u32	compressed_ack_rcv_nxt;
 	struct list_head tsq_node; /* anchor in tsq_tasklet.head list */
 
-	u8	scaling_ratio;	/* see tcp_win_from_space() */
 	/* Information of the most recently (s)acked skb */
 	struct tcp_rack {
 		u64 mstamp; /* (Re)sent time of the skb */
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 7e2481b9eae1b791e1ec65f39efa41837a9fcbd3..c82dc42f57c65df112f79080ff407cd98d11ce68 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -4615,7 +4615,8 @@ static void __init tcp_struct_check(void)
 	CACHELINE_ASSERT_GROUP_MEMBER(struct tcp_sock, tcp_sock_read_txrx, prr_out);
 	CACHELINE_ASSERT_GROUP_MEMBER(struct tcp_sock, tcp_sock_read_txrx, lost_out);
 	CACHELINE_ASSERT_GROUP_MEMBER(struct tcp_sock, tcp_sock_read_txrx, sacked_out);
-	CACHELINE_ASSERT_GROUP_SIZE(struct tcp_sock, tcp_sock_read_txrx, 31);
+	CACHELINE_ASSERT_GROUP_MEMBER(struct tcp_sock, tcp_sock_read_txrx, scaling_ratio);
+	CACHELINE_ASSERT_GROUP_SIZE(struct tcp_sock, tcp_sock_read_txrx, 32);
 
 	/* RX read-mostly hotpath cache lines */
 	CACHELINE_ASSERT_GROUP_MEMBER(struct tcp_sock, tcp_sock_read_rx, copied_seq);
-- 
2.43.0.594.gd9cf4e227d-goog