From 77eee32514314209961af5c2982e871ecb364445 Mon Sep 17 00:00:00 2001
From: Wen Gu <guwen@linux.alibaba.com>
Date: Tue, 20 Sep 2022 17:52:21 +0800
Subject: net/smc: Introduce a specific sysctl for TEST_LINK time
SMC-R tests the viability of link by sending out TEST_LINK LLC
messages over RoCE fabric when connections on link have been
idle for a time longer than keepalive interval (testlink time).
But using tcp_keepalive_time as testlink time maybe not quite
suitable because it is default no less than two hours[1], which
is too long for single link to find peer dead. The active host
will still use peer-dead link (QP) sending messages, and can't
find out until get IB_WC_RETRY_EXC_ERR error CQEs, which takes
more time than TEST_LINK timeout (SMC_LLC_WAIT_TIME) normally.
So this patch introduces a independent sysctl for SMC-R to set
link keepalive time, in order to detect link down in time. The
default value is 30 seconds.
[1] https://www.rfc-editor.org/rfc/rfc1122#page-101
Signed-off-by: Wen Gu <guwen@linux.alibaba.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
---
include/net/netns/smc.h | 1 +
1 file changed, 1 insertion(+)
(limited to 'include/net/netns')
diff --git a/include/net/netns/smc.h b/include/net/netns/smc.h
index 2adbe2b245df..d295e2c10dca 100644
--- a/include/net/netns/smc.h
+++ b/include/net/netns/smc.h
@@ -19,5 +19,6 @@ struct netns_smc {
#endif
unsigned int sysctl_autocorking_size;
unsigned int sysctl_smcr_buf_type;
+ int sysctl_smcr_testlink_time;
};
#endif
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