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net: introduce a config option to tweak MAX_SKB_FRAGS

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Currently, MAX_SKB_FRAGS value is 17.

For standard tcp sendmsg() traffic, no big deal because tcp_sendmsg()
attempts order-3 allocations, stuffing 32768 bytes per frag.

But with zero copy, we use order-0 pages.

For BIG TCP to show its full potential, we add a config option
to be able to fit up to 45 segments per skb.

This is also needed for BIG TCP rx zerocopy, as zerocopy currently
does not support skbs with frag list.

We have used MAX_SKB_FRAGS=45 value for years at Google before
we deployed 4K MTU, with no adverse effect, other than
a recent issue in mlx4, fixed in commit 26782aad00
("net/mlx4: MLX4_TX_BOUNCE_BUFFER_SIZE depends on MAX_SKB_FRAGS")

Back then, goal was to be able to receive full size (64KB) GRO
packets without the frag_list overhead.

Note that /proc/sys/net/core/max_skb_frags can also be used to limit
the number of fragments TCP can use in tx packets.

By default we keep the old/legacy value of 17 until we get
more coverage for the updated values.

Sizes of struct skb_shared_info on 64bit arches

MAX_SKB_FRAGS | sizeof(struct skb_shared_info):
==============================================
         17     320
         21     320+64  = 384
         25     320+128 = 448
         29     320+192 = 512
         33     320+256 = 576
         37     320+320 = 640
         41     320+384 = 704
         45     320+448 = 768

This inflation might cause problems for drivers assuming they could pack
both the incoming packet (for MTU=1500) and skb_shared_info in half a page,
using build_skb().

v3: fix build error when CONFIG_NET=n
v2: fix two build errors assuming MAX_SKB_FRAGS was "unsigned long"

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Nikolay Aleksandrov <razor@blackwall.org>
Reviewed-by: Jason Xing <kerneljasonxing@gmail.com>
Link: https://lore.kernel.org/r/20230323162842.1935061-1-eric.dumazet@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2023-03-23 09:28:42 -07:00 committed by Jakub Kicinski
parent e5b42483cc
commit 3948b05950
4 changed files with 21 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/scsi/cxgbi/libcxgbi.c
View File

@ -2314,9 +2314,9 @@ static int cxgbi_sock_tx_queue_up(struct cxgbi_sock *csk, struct sk_buff *skb)
frags++;
if (frags >= SKB_WR_LIST_SIZE) {
pr_err("csk 0x%p, frags %u, %u,%u >%lu.\n",
pr_err("csk 0x%p, frags %u, %u,%u >%u.\n",
csk, skb_shinfo(skb)->nr_frags, skb->len,
skb->data_len, SKB_WR_LIST_SIZE);
skb->data_len, (unsigned int)SKB_WR_LIST_SIZE);
return -EINVAL;
}

16
include/linux/skbuff.h
View File

@ -345,18 +345,12 @@ struct sk_buff_head {
struct sk_buff;
/* To allow 64K frame to be packed as single skb without frag_list we
* require 64K/PAGE_SIZE pages plus 1 additional page to allow for
* buffers which do not start on a page boundary.
*
* Since GRO uses frags we allocate at least 16 regardless of page
* size.
*/
#if (65536/PAGE_SIZE + 1) < 16
#define MAX_SKB_FRAGS 16UL
#else
#define MAX_SKB_FRAGS (65536/PAGE_SIZE + 1)
#ifndef CONFIG_MAX_SKB_FRAGS
# define CONFIG_MAX_SKB_FRAGS 17
#endif
#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

12
net/Kconfig
View File

@ -251,6 +251,18 @@ config PCPU_DEV_REFCNT
network device refcount are using per cpu variables if this option is set.
This can be forced to N to detect underflows (with a performance drop).
config MAX_SKB_FRAGS
int "Maximum number of fragments per skb_shared_info"
range 17 45
default 17
help
Having more fragments per skb_shared_info can help GRO efficiency.
This helps BIG TCP workloads, but might expose bugs in some
legacy drivers.
This also increases memory overhead of small packets,
and in drivers using build_skb().
If unsure, say 17.
config RPS
bool
depends on SMP && SYSFS

4
net/packet/af_packet.c
View File

@ -2622,8 +2622,8 @@ static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
nr_frags = skb_shinfo(skb)->nr_frags;
if (unlikely(nr_frags >= MAX_SKB_FRAGS)) {
pr_err("Packet exceed the number of skb frags(%lu)\n",
MAX_SKB_FRAGS);
pr_err("Packet exceed the number of skb frags(%u)\n",
(unsigned int)MAX_SKB_FRAGS);
return -EFAULT;
}