[LTP] [PATCH] syscalls/ioctl03: add IFF_BACKPRESSURE flag

[LTP] [PATCH] syscalls/ioctl03: add IFF_BACKPRESSURE flag

[Avinesh Kumar via ltp]

From: Avinesh Kumar <avinesh.kumar@suse.com>

Kernel commit 485e38995cc3 ("tun/tap: add IFF_BACKPRESSURE flag")
introduced a new TUNSETIFF flag, and d00c7369ef24 ("tun/tap &
vhost-net: stop tail-drop when IFF_BACKPRESSURE is set") added it
to TUN_FEATURES. TUNGETFEATURES now reports bit 0x80 on kernels
that support it, which ioctl03 does not recognize and reports as:

  ioctl03.c:90: TFAIL: (UNKNOWN 0x80)

Add IFF_BACKPRESSURE to the known flags table.

Signed-off-by: Avinesh Kumar <avinesh.kumar@suse.com>
---
 testcases/kernel/syscalls/ioctl/ioctl03.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/testcases/kernel/syscalls/ioctl/ioctl03.c b/testcases/kernel/syscalls/ioctl/ioctl03.c
index 8a868a98e605..1f538016344c 100644
--- a/testcases/kernel/syscalls/ioctl/ioctl03.c
+++ b/testcases/kernel/syscalls/ioctl/ioctl03.c
@@ -44,6 +44,10 @@
 #define IFF_NO_CARRIER	0x0040
 #endif
 
+#ifndef IFF_BACKPRESSURE
+#define IFF_BACKPRESSURE	0x0080
+#endif
+
 static struct {
 	unsigned int flag;
 	const char *name;
@@ -56,7 +60,8 @@ static struct {
 	{IFF_MULTI_QUEUE, "MULTI_QUEUE"},
 	{IFF_NAPI, "IFF_NAPI"},
 	{IFF_NAPI_FRAGS, "IFF_NAPI_FRAGS"},
-	{IFF_NO_CARRIER, "IFF_NO_CARRIER"}
+	{IFF_NO_CARRIER, "IFF_NO_CARRIER"},
+	{IFF_BACKPRESSURE, "IFF_BACKPRESSURE"}
 };
 
 static void verify_features(void)
-- 
2.55.0


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Re: [LTP] syscalls/ioctl03: add IFF_BACKPRESSURE flag

[linuxtestproject.agent]

Hi Avinesh,

On Wed, Sep 2, 2026, Avinesh Kumar wrote:
> syscalls/ioctl03: add IFF_BACKPRESSURE flag

Verdict - Reviewed

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Note:

The agent can sometimes produce false positives although often its
findings are genuine. If you find issues with the review, please
comment this email or ignore the suggestions.

Regards,
LTP AI Reviewer

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Re: [LTP] [PATCH] syscalls/ioctl03: add IFF_BACKPRESSURE flag

[Andrea Cervesato via ltp]

Reviewed-by: Andrea Cervesato <andrea.cervesato@suse.com>

--
Andrea Cervesato
SUSE QE Automation Engineer Linux
andrea.cervesato@suse.com

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Re: [LTP] [PATCH] syscalls/ioctl03: add IFF_BACKPRESSURE flag

[Andrea Cervesato via ltp]

Merged, Thanks!

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Andrea Cervesato
SUSE QE Automation Engineer Linux
andrea.cervesato@suse.com

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