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net/smc: Add global configure for handshake limitation by netlink

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Although we can control SMC handshake limitation through socket options,
which means that applications who need it must modify their code. It's
quite troublesome for many existing applications. This patch modifies
the global default value of SMC handshake limitation through netlink,
providing a way to put constraint on handshake without modifies any code
for applications.

Suggested-by: Tony Lu <tonylu@linux.alibaba.com>
Signed-off-by: D. Wythe <alibuda@linux.alibaba.com>
Reviewed-by: Tony Lu <tonylu@linux.alibaba.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
D. Wythe 2022-02-10 17:11:38 +08:00 • committed by David S. Miller
parent a6a6fe27ba
commit f9496b7c1b
6 changed files with 79 additions and 0 deletions
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11
include/uapi/linux/smc.h
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@ -59,6 +59,9 @@ enum {
SMC_NETLINK_DUMP_SEID,
SMC_NETLINK_ENABLE_SEID,
SMC_NETLINK_DISABLE_SEID,
SMC_NETLINK_DUMP_HS_LIMITATION,
SMC_NETLINK_ENABLE_HS_LIMITATION,
SMC_NETLINK_DISABLE_HS_LIMITATION,
};
/* SMC_GENL_FAMILY top level attributes */
@ -285,6 +288,14 @@ enum {
SMC_NLA_SEID_TABLE_MAX = __SMC_NLA_SEID_TABLE_MAX - 1
};
/* SMC_NETLINK_HS_LIMITATION attributes */
enum {
SMC_NLA_HS_LIMITATION_UNSPEC,
SMC_NLA_HS_LIMITATION_ENABLED, /* u8 */
__SMC_NLA_HS_LIMITATION_MAX,
SMC_NLA_HS_LIMITATION_MAX = __SMC_NLA_HS_LIMITATION_MAX - 1
};
/* SMC socket options */
#define SMC_LIMIT_HS 1 /* constraint on smc handshake */