2a4c57a9e7
SMC handles deferred work in tasklets. As tasklets cannot sleep this can result in rare EBUSY conditions, so defer this work in a work queue. The high level api functions do not defer work because they can sleep until the llc send is actually completed. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
54 lines
1.4 KiB
C
54 lines
1.4 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_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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/* transmit */
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int smc_llc_send_confirm_link(struct smc_link *lnk, u8 mac[], union ib_gid *gid,
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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[], union ib_gid *gid,
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enum smc_llc_reqresp reqresp);
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int smc_llc_send_delete_link(struct smc_link *link,
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enum smc_llc_reqresp reqresp);
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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, int testlink_time);
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void smc_llc_link_inactive(struct smc_link *link);
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void smc_llc_link_clear(struct smc_link *link);
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int smc_llc_do_confirm_rkey(struct smc_link *link,
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struct smc_buf_desc *rmb_desc);
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int smc_llc_init(void) __init;
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#endif /* SMC_LLC_H */
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