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net: move sysctl_max_skb_frags to net_hotdata

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sysctl_max_skb_frags is used in TCP and MPTCP fast paths,
move it to net_hodata for better cache locality.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://lore.kernel.org/r/20240429134025.1233626-2-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2024-04-29 13:40:21 +00:00 committed by Jakub Kicinski
parent 05d6d49209
commit a86a0661b8
7 changed files with 8 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/linux/skbuff.h
View File

@ -353,8 +353,6 @@ struct sk_buff;
#define MAX_SKB_FRAGS CONFIG_MAX_SKB_FRAGS
extern int sysctl_max_skb_frags;
/* Set skb_shinfo(skb)->gso_size to this in case you want skb_segment to
* segment using its current segmentation instead.
*/

1
include/net/hotdata.h
View File

@ -38,6 +38,7 @@ struct net_hotdata {
int max_backlog;
int dev_tx_weight;
int dev_rx_weight;
int sysctl_max_skb_frags;
};
#define inet_ehash_secret net_hotdata.tcp_protocol.secret

1
net/core/hotdata.c
View File

@ -18,5 +18,6 @@ struct net_hotdata net_hotdata __cacheline_aligned = {
.max_backlog = 1000,
.dev_tx_weight = 64,
.dev_rx_weight = 64,
.sysctl_max_skb_frags = MAX_SKB_FRAGS,
};
EXPORT_SYMBOL(net_hotdata);

5
net/core/skbuff.c
View File

@ -109,9 +109,6 @@ static struct kmem_cache *skbuff_ext_cache __ro_after_init;
#define SKB_SMALL_HEAD_HEADROOM \
SKB_WITH_OVERHEAD(SKB_SMALL_HEAD_CACHE_SIZE)
int sysctl_max_skb_frags __read_mostly = MAX_SKB_FRAGS;
EXPORT_SYMBOL(sysctl_max_skb_frags);
/* kcm_write_msgs() relies on casting paged frags to bio_vec to use
* iov_iter_bvec(). These static asserts ensure the cast is valid is long as the
* netmem is a page.
@ -7040,7 +7037,7 @@ static void skb_splice_csum_page(struct sk_buff *skb, struct page *page,
ssize_t skb_splice_from_iter(struct sk_buff *skb, struct iov_iter *iter,
ssize_t maxsize, gfp_t gfp)
{
size_t frag_limit = READ_ONCE(sysctl_max_skb_frags);
size_t frag_limit = READ_ONCE(net_hotdata.sysctl_max_skb_frags);
struct page *pages[8], **ppages = pages;
ssize_t spliced = 0, ret = 0;
unsigned int i;

2
net/core/sysctl_net_core.c
View File

@ -595,7 +595,7 @@ static struct ctl_table net_core_table[] = {
},
{
.procname = "max_skb_frags",
.data = &sysctl_max_skb_frags,
.data = &net_hotdata.sysctl_max_skb_frags,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,

3
net/ipv4/tcp.c
View File

@ -280,6 +280,7 @@
#include <linux/uaccess.h>
#include <asm/ioctls.h>
#include <net/busy_poll.h>
#include <net/hotdata.h>
#include <net/rps.h>
/* Track pending CMSGs. */
@ -1188,7 +1189,7 @@ new_segment:
if (!skb_can_coalesce(skb, i, pfrag->page,
pfrag->offset)) {
if (i >= READ_ONCE(sysctl_max_skb_frags)) {
if (i >= READ_ONCE(net_hotdata.sysctl_max_skb_frags)) {
tcp_mark_push(tp, skb);
goto new_segment;
}

3
net/mptcp/protocol.c
View File

@ -20,6 +20,7 @@
#include <net/transp_v6.h>
#endif
#include <net/mptcp.h>
#include <net/hotdata.h>
#include <net/xfrm.h>
#include <asm/ioctls.h>
#include "protocol.h"
@ -1272,7 +1273,7 @@ static int mptcp_sendmsg_frag(struct sock *sk, struct sock *ssk,
i = skb_shinfo(skb)->nr_frags;
can_coalesce = skb_can_coalesce(skb, i, dfrag->page, offset);
if (!can_coalesce && i >= READ_ONCE(sysctl_max_skb_frags)) {
if (!can_coalesce && i >= READ_ONCE(net_hotdata.sysctl_max_skb_frags)) {
tcp_mark_push(tcp_sk(ssk), skb);
goto alloc_skb;
}