netdev - [PATCH net-next 01/10] rtnetlink: Add RTM_F_OFFLOAD

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Date:   Sun,  7 Feb 2021 10:22:49 +0200
From:   Ido Schimmel <idosch@...sch.org>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, dsahern@...il.com,
        jiri@...dia.com, yoshfuji@...ux-ipv6.org, amcohen@...dia.com,
        roopa@...dia.com, bpoirier@...dia.com, sharpd@...dia.com,
        mlxsw@...dia.com, Ido Schimmel <idosch@...dia.com>
Subject: [PATCH net-next 01/10] rtnetlink: Add RTM_F_OFFLOAD_FAILED flag

From: Amit Cohen <amcohen@...dia.com>

The flag indicates to user space that route offload failed.

Previous patch set added the ability to emit RTM_NEWROUTE notifications
whenever RTM_F_OFFLOAD/RTM_F_TRAP flags are changed, but if the offload
fails there is no indication to user-space.

The flag will be used in subsequent patches by netdevsim and mlxsw to
indicate to user space that route offload failed, so that users will
have better visibility into the offload process.

Signed-off-by: Amit Cohen <amcohen@...dia.com>
Signed-off-by: Ido Schimmel <idosch@...dia.com>
---
 include/uapi/linux/rtnetlink.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/uapi/linux/rtnetlink.h b/include/uapi/linux/rtnetlink.h
index b841caa4657e..91e4ca064d61 100644
--- a/include/uapi/linux/rtnetlink.h
+++ b/include/uapi/linux/rtnetlink.h
@@ -319,6 +319,11 @@ enum rt_scope_t {
 #define RTM_F_FIB_MATCH	        0x2000	/* return full fib lookup match */
 #define RTM_F_OFFLOAD		0x4000	/* route is offloaded */
 #define RTM_F_TRAP		0x8000	/* route is trapping packets */
+#define RTM_F_OFFLOAD_FAILED	0x20000000 /* route offload failed, this value
+					    * is chosen to avoid conflicts with
+					    * other flags defined in
+					    * include/uapi/linux/ipv6_route.h
+					    */
 
 /* Reserved table identifiers */
 
-- 
2.29.2