mirror of
https://github.com/torvalds/linux.git
synced 2024-12-11 13:41:55 +00:00
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>
121 lines
4.0 KiB
C
121 lines
4.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* Shared Memory Communications over RDMA (SMC-R) and RoCE
|
|
*
|
|
* Definitions for LLC (link layer control) message handling
|
|
*
|
|
* Copyright IBM Corp. 2016
|
|
*
|
|
* Author(s): Klaus Wacker <Klaus.Wacker@de.ibm.com>
|
|
* Ursula Braun <ubraun@linux.vnet.ibm.com>
|
|
*/
|
|
|
|
#ifndef SMC_LLC_H
|
|
#define SMC_LLC_H
|
|
|
|
#include "smc_wr.h"
|
|
|
|
#define SMC_LLC_FLAG_RESP 0x80
|
|
|
|
#define SMC_LLC_WAIT_FIRST_TIME (5 * HZ)
|
|
#define SMC_LLC_WAIT_TIME (2 * HZ)
|
|
#define SMC_LLC_TESTLINK_DEFAULT_TIME (30 * HZ)
|
|
|
|
enum smc_llc_reqresp {
|
|
SMC_LLC_REQ,
|
|
SMC_LLC_RESP
|
|
};
|
|
|
|
enum smc_llc_msg_type {
|
|
SMC_LLC_CONFIRM_LINK = 0x01,
|
|
SMC_LLC_ADD_LINK = 0x02,
|
|
SMC_LLC_ADD_LINK_CONT = 0x03,
|
|
SMC_LLC_DELETE_LINK = 0x04,
|
|
SMC_LLC_REQ_ADD_LINK = 0x05,
|
|
SMC_LLC_CONFIRM_RKEY = 0x06,
|
|
SMC_LLC_TEST_LINK = 0x07,
|
|
SMC_LLC_CONFIRM_RKEY_CONT = 0x08,
|
|
SMC_LLC_DELETE_RKEY = 0x09,
|
|
/* V2 types */
|
|
SMC_LLC_CONFIRM_LINK_V2 = 0x21,
|
|
SMC_LLC_ADD_LINK_V2 = 0x22,
|
|
SMC_LLC_DELETE_LINK_V2 = 0x24,
|
|
SMC_LLC_REQ_ADD_LINK_V2 = 0x25,
|
|
SMC_LLC_CONFIRM_RKEY_V2 = 0x26,
|
|
SMC_LLC_TEST_LINK_V2 = 0x27,
|
|
SMC_LLC_DELETE_RKEY_V2 = 0x29,
|
|
};
|
|
|
|
#define smc_link_downing(state) \
|
|
(cmpxchg(state, SMC_LNK_ACTIVE, SMC_LNK_INACTIVE) == SMC_LNK_ACTIVE)
|
|
|
|
/* LLC DELETE LINK Request Reason Codes */
|
|
#define SMC_LLC_DEL_LOST_PATH 0x00010000
|
|
#define SMC_LLC_DEL_OP_INIT_TERM 0x00020000
|
|
#define SMC_LLC_DEL_PROG_INIT_TERM 0x00030000
|
|
#define SMC_LLC_DEL_PROT_VIOL 0x00040000
|
|
#define SMC_LLC_DEL_NO_ASYM_NEEDED 0x00050000
|
|
/* LLC DELETE LINK Response Reason Codes */
|
|
#define SMC_LLC_DEL_NOLNK 0x00100000 /* Unknown Link ID (no link) */
|
|
#define SMC_LLC_DEL_NOLGR 0x00200000 /* Unknown Link Group */
|
|
|
|
/* returns a usable link of the link group, or NULL */
|
|
static inline struct smc_link *smc_llc_usable_link(struct smc_link_group *lgr)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++)
|
|
if (smc_link_usable(&lgr->lnk[i]))
|
|
return &lgr->lnk[i];
|
|
return NULL;
|
|
}
|
|
|
|
/* set the termination reason code for the link group */
|
|
static inline void smc_llc_set_termination_rsn(struct smc_link_group *lgr,
|
|
u32 rsn)
|
|
{
|
|
if (!lgr->llc_termination_rsn)
|
|
lgr->llc_termination_rsn = rsn;
|
|
}
|
|
|
|
/* transmit */
|
|
int smc_llc_send_confirm_link(struct smc_link *lnk,
|
|
enum smc_llc_reqresp reqresp);
|
|
int smc_llc_send_add_link(struct smc_link *link, u8 mac[], u8 gid[],
|
|
struct smc_link *link_new,
|
|
enum smc_llc_reqresp reqresp);
|
|
int smc_llc_send_delete_link(struct smc_link *link, u8 link_del_id,
|
|
enum smc_llc_reqresp reqresp, bool orderly,
|
|
u32 reason);
|
|
void smc_llc_srv_delete_link_local(struct smc_link *link, u8 del_link_id);
|
|
void smc_llc_lgr_init(struct smc_link_group *lgr, struct smc_sock *smc);
|
|
void smc_llc_lgr_clear(struct smc_link_group *lgr);
|
|
int smc_llc_link_init(struct smc_link *link);
|
|
void smc_llc_link_active(struct smc_link *link);
|
|
void smc_llc_link_clear(struct smc_link *link, bool log);
|
|
int smc_llc_do_confirm_rkey(struct smc_link *send_link,
|
|
struct smc_buf_desc *rmb_desc);
|
|
int smc_llc_do_delete_rkey(struct smc_link_group *lgr,
|
|
struct smc_buf_desc *rmb_desc);
|
|
int smc_llc_flow_initiate(struct smc_link_group *lgr,
|
|
enum smc_llc_flowtype type);
|
|
void smc_llc_flow_stop(struct smc_link_group *lgr, struct smc_llc_flow *flow);
|
|
int smc_llc_eval_conf_link(struct smc_llc_qentry *qentry,
|
|
enum smc_llc_reqresp type);
|
|
void smc_llc_link_set_uid(struct smc_link *link);
|
|
void smc_llc_save_peer_uid(struct smc_llc_qentry *qentry);
|
|
struct smc_llc_qentry *smc_llc_wait(struct smc_link_group *lgr,
|
|
struct smc_link *lnk,
|
|
int time_out, u8 exp_msg);
|
|
struct smc_llc_qentry *smc_llc_flow_qentry_clr(struct smc_llc_flow *flow);
|
|
void smc_llc_flow_qentry_del(struct smc_llc_flow *flow);
|
|
void smc_llc_send_link_delete_all(struct smc_link_group *lgr, bool ord,
|
|
u32 rsn);
|
|
int smc_llc_cli_add_link(struct smc_link *link, struct smc_llc_qentry *qentry);
|
|
int smc_llc_srv_add_link(struct smc_link *link,
|
|
struct smc_llc_qentry *req_qentry);
|
|
void smc_llc_add_link_local(struct smc_link *link);
|
|
int smc_llc_init(void) __init;
|
|
|
|
#endif /* SMC_LLC_H */
|