forked from Minki/linux
c48254fa48
When a new ib device is up smc will send an add link invitation to the
peer if needed. This is currently done with rudimentary flow control.
Under high workload these add link invitations can disturb other llc
flows because they arrive unexpected. Fix this by integrating the
invitations into the normal llc event flow and handle them as a flow.
While at it, check for already assigned requests in the flow before
the new add link request is assigned.
Reviewed-by: Ursula Braun <ubraun@linux.ibm.com>
Fixes: 1f90a05d9f ("net/smc: add smcr_port_add() and smcr_link_up() processing")
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
110 lines
3.6 KiB
C
110 lines
3.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Shared Memory Communications over RDMA (SMC-R) and RoCE
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*
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* Definitions for LLC (link layer control) message handling
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*
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* Copyright IBM Corp. 2016
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*
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* Author(s): Klaus Wacker <Klaus.Wacker@de.ibm.com>
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* Ursula Braun <ubraun@linux.vnet.ibm.com>
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*/
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#ifndef SMC_LLC_H
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#define SMC_LLC_H
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#include "smc_wr.h"
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#define SMC_LLC_FLAG_RESP 0x80
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#define SMC_LLC_WAIT_FIRST_TIME (5 * HZ)
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#define SMC_LLC_WAIT_TIME (2 * HZ)
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enum smc_llc_reqresp {
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SMC_LLC_REQ,
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SMC_LLC_RESP
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};
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enum smc_llc_msg_type {
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SMC_LLC_CONFIRM_LINK = 0x01,
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SMC_LLC_ADD_LINK = 0x02,
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SMC_LLC_ADD_LINK_CONT = 0x03,
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SMC_LLC_DELETE_LINK = 0x04,
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SMC_LLC_CONFIRM_RKEY = 0x06,
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SMC_LLC_TEST_LINK = 0x07,
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SMC_LLC_CONFIRM_RKEY_CONT = 0x08,
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SMC_LLC_DELETE_RKEY = 0x09,
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};
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#define smc_link_downing(state) \
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(cmpxchg(state, SMC_LNK_ACTIVE, SMC_LNK_INACTIVE) == SMC_LNK_ACTIVE)
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/* LLC DELETE LINK Request Reason Codes */
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#define SMC_LLC_DEL_LOST_PATH 0x00010000
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#define SMC_LLC_DEL_OP_INIT_TERM 0x00020000
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#define SMC_LLC_DEL_PROG_INIT_TERM 0x00030000
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#define SMC_LLC_DEL_PROT_VIOL 0x00040000
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#define SMC_LLC_DEL_NO_ASYM_NEEDED 0x00050000
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/* LLC DELETE LINK Response Reason Codes */
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#define SMC_LLC_DEL_NOLNK 0x00100000 /* Unknown Link ID (no link) */
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#define SMC_LLC_DEL_NOLGR 0x00200000 /* Unknown Link Group */
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/* returns a usable link of the link group, or NULL */
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static inline struct smc_link *smc_llc_usable_link(struct smc_link_group *lgr)
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{
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int i;
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for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++)
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if (smc_link_usable(&lgr->lnk[i]))
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return &lgr->lnk[i];
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return NULL;
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}
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/* set the termination reason code for the link group */
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static inline void smc_llc_set_termination_rsn(struct smc_link_group *lgr,
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u32 rsn)
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{
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if (!lgr->llc_termination_rsn)
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lgr->llc_termination_rsn = rsn;
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}
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/* transmit */
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int smc_llc_send_confirm_link(struct smc_link *lnk,
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enum smc_llc_reqresp reqresp);
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int smc_llc_send_add_link(struct smc_link *link, u8 mac[], u8 gid[],
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struct smc_link *link_new,
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enum smc_llc_reqresp reqresp);
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int smc_llc_send_delete_link(struct smc_link *link, u8 link_del_id,
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enum smc_llc_reqresp reqresp, bool orderly,
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u32 reason);
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void smc_llc_srv_delete_link_local(struct smc_link *link, u8 del_link_id);
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void smc_llc_lgr_init(struct smc_link_group *lgr, struct smc_sock *smc);
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void smc_llc_lgr_clear(struct smc_link_group *lgr);
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int smc_llc_link_init(struct smc_link *link);
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void smc_llc_link_active(struct smc_link *link);
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void smc_llc_link_clear(struct smc_link *link, bool log);
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int smc_llc_do_confirm_rkey(struct smc_link *send_link,
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struct smc_buf_desc *rmb_desc);
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int smc_llc_do_delete_rkey(struct smc_link_group *lgr,
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struct smc_buf_desc *rmb_desc);
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int smc_llc_flow_initiate(struct smc_link_group *lgr,
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enum smc_llc_flowtype type);
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void smc_llc_flow_stop(struct smc_link_group *lgr, struct smc_llc_flow *flow);
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int smc_llc_eval_conf_link(struct smc_llc_qentry *qentry,
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enum smc_llc_reqresp type);
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void smc_llc_link_set_uid(struct smc_link *link);
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void smc_llc_save_peer_uid(struct smc_llc_qentry *qentry);
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struct smc_llc_qentry *smc_llc_wait(struct smc_link_group *lgr,
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struct smc_link *lnk,
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int time_out, u8 exp_msg);
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struct smc_llc_qentry *smc_llc_flow_qentry_clr(struct smc_llc_flow *flow);
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void smc_llc_flow_qentry_del(struct smc_llc_flow *flow);
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void smc_llc_send_link_delete_all(struct smc_link_group *lgr, bool ord,
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u32 rsn);
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int smc_llc_cli_add_link(struct smc_link *link, struct smc_llc_qentry *qentry);
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int smc_llc_srv_add_link(struct smc_link *link);
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void smc_llc_add_link_local(struct smc_link *link);
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int smc_llc_init(void) __init;
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#endif /* SMC_LLC_H */
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