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net/smc: stop links when their GID is removed 

With SMC-Rv2 the GID is an IP address that can be deleted from the
device. When an IB_EVENT_GID_CHANGE event is provided then iterate over
all active links and check if their GID is still defined. Otherwise
stop the affected link.

Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Karsten Graul 2021-10-16 11:37:52 +02:00 committed by David S. Miller
parent b0539f5edd
commit 29397e34c7
1 changed files with 53 additions and 0 deletions
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53
net/smc/smc_ib.c
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@ -295,6 +295,58 @@ int smc_ib_determine_gid(struct smc_ib_device *smcibdev, u8 ibport,
return -ENODEV;
}
/* check if gid is still defined on smcibdev */
static bool smc_ib_check_link_gid(u8 gid[SMC_GID_SIZE], bool smcrv2,
struct smc_ib_device *smcibdev, u8 ibport)
{
const struct ib_gid_attr *attr;
bool rc = false;
int i;
for (i = 0; !rc && i < smcibdev->pattr[ibport - 1].gid_tbl_len; i++) {
attr = rdma_get_gid_attr(smcibdev->ibdev, ibport, i);
if (IS_ERR(attr))
continue;
rcu_read_lock();
if ((!smcrv2 && attr->gid_type == IB_GID_TYPE_ROCE) ||
(smcrv2 && attr->gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP &&
!(ipv6_addr_type((const struct in6_addr *)&attr->gid)
& IPV6_ADDR_LINKLOCAL)))
if (!memcmp(gid, &attr->gid, SMC_GID_SIZE))
rc = true;
rcu_read_unlock();
rdma_put_gid_attr(attr);
}
return rc;
}
/* check all links if the gid is still defined on smcibdev */
static void smc_ib_gid_check(struct smc_ib_device *smcibdev, u8 ibport)
{
struct smc_link_group *lgr;
int i;
spin_lock_bh(&smc_lgr_list.lock);
list_for_each_entry(lgr, &smc_lgr_list.list, list) {
if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id,
SMC_MAX_PNETID_LEN))
continue; /* lgr is not affected */
if (list_empty(&lgr->list))
continue;
for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
if (lgr->lnk[i].state == SMC_LNK_UNUSED ||
lgr->lnk[i].smcibdev != smcibdev)
continue;
if (!smc_ib_check_link_gid(lgr->lnk[i].gid,
lgr->smc_version == SMC_V2,
smcibdev, ibport))
smcr_port_err(smcibdev, ibport);
}
}
spin_unlock_bh(&smc_lgr_list.lock);
}
static int smc_ib_remember_port_attr(struct smc_ib_device *smcibdev, u8 ibport)
{
int rc;
@ -333,6 +385,7 @@ static void smc_ib_port_event_work(struct work_struct *work)
} else {
clear_bit(port_idx, smcibdev->ports_going_away);
smcr_port_add(smcibdev, port_idx + 1);
smc_ib_gid_check(smcibdev, port_idx + 1);
}
}
}