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[RFC,net-next,16/20] net/smc: add inet proto defination for SMC

Message ID 1708412505-34470-17-git-send-email-alibuda@linux.alibaba.com (mailing list archive)
State Superseded
Headers show
Series Introduce IPPROTO_SMC | expand

Commit Message

D. Wythe Feb. 20, 2024, 7:01 a.m. UTC 
From: "D. Wythe" <alibuda@linux.alibaba.com>

To implement SMC based on INET sock, we need to be able to identify
its real sock type, So we need to apply for a unique IPPROTO_XXX
definition.

But unlike IPPROTO_TCP or other similar definitions, which values need
to be filled into IP message and transmitted in the network. In fact,
we just need make sure it is unique in the code. That is, IPPROTO_SMC
dose not exist in network, and it is only used to distinguish
actual inet sock type in code, and it's still IPPROTO_TCP that is
transmitted in the network.

In theory, we just need to define IPPROTO_SMC as value greater than 255
and unique in the code. In this patch, we pick 263, following
IPPROTO_MPTCP.

Signed-off-by: D. Wythe <alibuda@linux.alibaba.com>
---
 include/uapi/linux/in.h       | 2 ++
 tools/include/uapi/linux/in.h | 2 ++
 2 files changed, 4 insertions(+)
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Patch

diff --git a/include/uapi/linux/in.h b/include/uapi/linux/in.h
index e682ab6..7f4b449 100644
--- a/include/uapi/linux/in.h
+++ b/include/uapi/linux/in.h
@@ -83,6 +83,8 @@  enum {
 #define IPPROTO_RAW		IPPROTO_RAW
   IPPROTO_MPTCP = 262,		/* Multipath TCP connection		*/
 #define IPPROTO_MPTCP		IPPROTO_MPTCP
+	IPPROTO_SMC = 263,		/* Shared Memory Communications */
+#define IPPROTO_SMC		IPPROTO_SMC
   IPPROTO_MAX
 };
 #endif
diff --git a/tools/include/uapi/linux/in.h b/tools/include/uapi/linux/in.h
index e682ab6..7f4b449 100644
--- a/tools/include/uapi/linux/in.h
+++ b/tools/include/uapi/linux/in.h
@@ -83,6 +83,8 @@  enum {
 #define IPPROTO_RAW		IPPROTO_RAW
   IPPROTO_MPTCP = 262,		/* Multipath TCP connection		*/
 #define IPPROTO_MPTCP		IPPROTO_MPTCP
+	IPPROTO_SMC = 263,		/* Shared Memory Communications */
+#define IPPROTO_SMC		IPPROTO_SMC
   IPPROTO_MAX
 };
 #endif