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net/smc: mutex to protect the lgr against parallel reconfigurations

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Introduce llc_conf_mutex in the link group which is used to protect the
buffers and lgr states against parallel link reconfiguration.
This ensures that new connections do not start to register buffers with
the links of a link group when link creation or termination is running.

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
2020-05-01 12:48:05 +02:00
committed by David S. Miller
parent fbed3b37c8
commit d550066776
4 changed files with 34 additions and 12 deletions
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9
net/smc/af_smc.c
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@@ -344,6 +344,13 @@ static int smcr_lgr_reg_rmbs(struct smc_link *link,
struct smc_link_group *lgr = link->lgr;
int i, rc = 0;
rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY);
if (rc)
return rc;
/* protect against parallel smc_llc_cli_rkey_exchange() and
* parallel smcr_link_reg_rmb()
*/
mutex_lock(&lgr->llc_conf_mutex);
for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
if (lgr->lnk[i].state != SMC_LNK_ACTIVE)
continue;
@@ -360,6 +367,8 @@ static int smcr_lgr_reg_rmbs(struct smc_link *link,
}
rmb_desc->is_conf_rkey = true;
out:
mutex_unlock(&lgr->llc_conf_mutex);
smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl);
return rc;
}