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77eee32514
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>
25 lines
604 B
C
25 lines
604 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __NETNS_SMC_H__
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#define __NETNS_SMC_H__
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#include <linux/mutex.h>
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#include <linux/percpu.h>
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struct smc_stats_rsn;
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struct smc_stats;
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struct netns_smc {
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/* per cpu counters for SMC */
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struct smc_stats __percpu *smc_stats;
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/* protect fback_rsn */
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struct mutex mutex_fback_rsn;
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struct smc_stats_rsn *fback_rsn;
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bool limit_smc_hs; /* constraint on handshake */
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#ifdef CONFIG_SYSCTL
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struct ctl_table_header *smc_hdr;
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#endif
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unsigned int sysctl_autocorking_size;
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unsigned int sysctl_smcr_buf_type;
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int sysctl_smcr_testlink_time;
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};
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#endif
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