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net/smc: add termination reason and handle LLC protocol violation

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Allow to set the reason code for the link group termination, and set
meaningful values before termination processing is triggered. This
reason code is sent to the peer in the final delete link message.
When the LLC request or response layer receives a message type that was
not handled, drop a warning and terminate the link group.

Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Reviewed-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Karsten Graul
2020-05-04 14:18:45 +02:00
committed by David S. Miller
parent ad6c111b8a
commit 3e0c40afce
4 changed files with 30 additions and 2 deletions
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14
net/smc/smc_llc.c
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@@ -1420,6 +1420,14 @@ static void smc_llc_rmt_delete_rkey(struct smc_link_group *lgr)
smc_llc_flow_qentry_del(&lgr->llc_flow_rmt);
}
static void smc_llc_protocol_violation(struct smc_link_group *lgr, u8 type)
{
pr_warn_ratelimited("smc: SMC-R lg %*phN LLC protocol violation: "
"llc_type %d\n", SMC_LGR_ID_SIZE, &lgr->id, type);
smc_llc_set_termination_rsn(lgr, SMC_LLC_DEL_PROT_VIOL);
smc_lgr_terminate_sched(lgr);
}
/* flush the llc event queue */
static void smc_llc_event_flush(struct smc_link_group *lgr)
{
@@ -1520,6 +1528,9 @@ static void smc_llc_event_handler(struct smc_llc_qentry *qentry)
smc_llc_flow_stop(lgr, &lgr->llc_flow_rmt);
}
return;
default:
smc_llc_protocol_violation(lgr, llc->raw.hdr.common.type);
break;
}
out:
kfree(qentry);
@@ -1579,6 +1590,9 @@ static void smc_llc_rx_response(struct smc_link *link,
case SMC_LLC_CONFIRM_RKEY_CONT:
/* not used because max links is 3 */
break;
default:
smc_llc_protocol_violation(link->lgr, llc_type);
break;
}
kfree(qentry);
}