diff mbox series

[v6,net-next,10/13] net: loopback: enable BIG TCP packets

Message ID 20220510033219.2639364-11-eric.dumazet@gmail.com (mailing list archive)
State Superseded
Delegated to: Netdev Maintainers
Headers show
Series tcp: BIG TCP implementation | expand

Checks

Context Check Description
netdev/tree_selection success Clearly marked for net-next, async
netdev/fixes_present success Fixes tag not required for -next series
netdev/subject_prefix success Link
netdev/cover_letter success Series has a cover letter
netdev/patch_count success Link
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 2 this patch: 2
netdev/cc_maintainers success CCed 5 of 5 maintainers
netdev/build_clang success Errors and warnings before: 9 this patch: 9
netdev/module_param success Was 0 now: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 2 this patch: 2
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 8 lines checked
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Eric Dumazet May 10, 2022, 3:32 a.m. UTC 
From: Eric Dumazet <edumazet@google.com>

Set the driver limit to GSO_MAX_SIZE (512 KB).

This allows the admin/user to set a GSO limit up to this value.

Tested:

ip link set dev lo gso_max_size 200000
netperf -H ::1 -t TCP_RR -l 100 -- -r 80000,80000 &

tcpdump shows :

18:28:42.962116 IP6 ::1 > ::1: HBH 40051 > 63780: Flags [P.], seq 3626480001:3626560001, ack 3626560001, win 17743, options [nop,nop,TS val 3771179265 ecr 3771179265], length 80000
18:28:42.962138 IP6 ::1.63780 > ::1.40051: Flags [.], ack 3626560001, win 17743, options [nop,nop,TS val 3771179265 ecr 3771179265], length 0
18:28:42.962152 IP6 ::1 > ::1: HBH 63780 > 40051: Flags [P.], seq 3626560001:3626640001, ack 3626560001, win 17743, options [nop,nop,TS val 3771179265 ecr 3771179265], length 80000
18:28:42.962157 IP6 ::1.40051 > ::1.63780: Flags [.], ack 3626640001, win 17743, options [nop,nop,TS val 3771179265 ecr 3771179265], length 0
18:28:42.962180 IP6 ::1 > ::1: HBH 40051 > 63780: Flags [P.], seq 3626560001:3626640001, ack 3626640001, win 17743, options [nop,nop,TS val 3771179265 ecr 3771179265], length 80000
18:28:42.962214 IP6 ::1.63780 > ::1.40051: Flags [.], ack 3626640001, win 17743, options [nop,nop,TS val 3771179266 ecr 3771179265], length 0
18:28:42.962228 IP6 ::1 > ::1: HBH 63780 > 40051: Flags [P.], seq 3626640001:3626720001, ack 3626640001, win 17743, options [nop,nop,TS val 3771179266 ecr 3771179265], length 80000
18:28:42.962233 IP6 ::1.40051 > ::1.63780: Flags [.], ack 3626720001, win 17743, options [nop,nop,TS val 3771179266 ecr 3771179266], length 0

Signed-off-by: Eric Dumazet <edumazet@google.com>
---
 drivers/net/loopback.c | 2 ++
 1 file changed, 2 insertions(+)
diff mbox series

Patch

diff --git a/drivers/net/loopback.c b/drivers/net/loopback.c
index 720394c0639b20a2fd6262e4ee9d5813c02802f1..14e8d04cb4347cb7b9171d576156fb8e8ecebbe3 100644
--- a/drivers/net/loopback.c
+++ b/drivers/net/loopback.c
@@ -191,6 +191,8 @@  static void gen_lo_setup(struct net_device *dev,
 	dev->netdev_ops		= dev_ops;
 	dev->needs_free_netdev	= true;
 	dev->priv_destructor	= dev_destructor;
+
+	netif_set_tso_max_size(dev, GSO_MAX_SIZE);
 }
 
 /* The loopback device is special. There is only one instance