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net/smc: determine vlan_id of stacked net_device

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An SMC link group is bound to a specific vlan_id. Its link uses
the RoCE-GIDs established for the specific vlan_id. This patch makes
sure the appropriate vlan_id is determined for stacked scenarios like
for instance a master bonding device with vlan devices enslaved.

Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ursula Braun 2018-05-02 16:56:47 +02:00 committed by David S. Miller
parent 9b67e26f93
commit cb9d43f677
1 changed files with 23 additions and 3 deletions
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26
net/smc/smc_core.c
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@ -360,7 +360,8 @@ void smc_lgr_terminate(struct smc_link_group *lgr)
static int smc_vlan_by_tcpsk(struct socket *clcsock, unsigned short *vlan_id)
{
struct dst_entry *dst = sk_dst_get(clcsock->sk);
int rc = 0;
struct net_device *ndev;
int i, nest_lvl, rc = 0;
*vlan_id = 0;
if (!dst) {
@ -372,8 +373,27 @@ static int smc_vlan_by_tcpsk(struct socket *clcsock, unsigned short *vlan_id)
goto out_rel;
}
if (is_vlan_dev(dst->dev))
*vlan_id = vlan_dev_vlan_id(dst->dev);
ndev = dst->dev;
if (is_vlan_dev(ndev)) {
*vlan_id = vlan_dev_vlan_id(ndev);
goto out_rel;
}
rtnl_lock();
nest_lvl = dev_get_nest_level(ndev);
for (i = 0; i < nest_lvl; i++) {
struct list_head *lower = &ndev->adj_list.lower;
if (list_empty(lower))
break;
lower = lower->next;
ndev = (struct net_device *)netdev_lower_get_next(ndev, &lower);
if (is_vlan_dev(ndev)) {
*vlan_id = vlan_dev_vlan_id(ndev);
break;
}
}
rtnl_unlock();
out_rel:
dst_release(dst);