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| author | Wen Gu <guwen@linux.alibaba.com> | 2022-09-20 17:52:21 +0800 |
|---|---|---|
| committer | Paolo Abeni <pabeni@redhat.com> | 2022-09-22 12:58:21 +0200 |
| commit | 77eee32514314209961af5c2982e871ecb364445 (patch) | |
| tree | 36a7bf8259b6498405019cf715c2894265b6737f /Documentation/networking | |
| parent | 9b17dbd97de78796997583340b540bdb571694e6 (diff) | |
| download | linux-rpi-77eee32514314209961af5c2982e871ecb364445.tar.gz linux-rpi-77eee32514314209961af5c2982e871ecb364445.tar.bz2 linux-rpi-77eee32514314209961af5c2982e871ecb364445.zip | |
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>
Diffstat (limited to 'Documentation/networking')
| -rw-r--r-- | Documentation/networking/smc-sysctl.rst | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/networking/smc-sysctl.rst b/Documentation/networking/smc-sysctl.rst index 742e90e6d822..45ba1522e189 100644 --- a/Documentation/networking/smc-sysctl.rst +++ b/Documentation/networking/smc-sysctl.rst @@ -34,3 +34,10 @@ smcr_buf_type - INTEGER - 1 - Use virtually contiguous buffers - 2 - Mixed use of the two types. Try physically contiguous buffers first. If not available, use virtually contiguous buffers then. + +smcr_testlink_time - INTEGER + How frequently SMC-R link sends out TEST_LINK LLC messages to confirm + viability, after the last activity of connections on it. Value 0 means + disabling TEST_LINK. + + Default: 30 seconds. |