Commit cb9d43f6 authored by Ursula Braun's avatar Ursula Braun Committed by David S. Miller
Browse files

net/smc: determine vlan_id of stacked net_device 



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: default avatarUrsula Braun <ubraun@linux.ibm.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 9b67e26f

net/smc/smc_core.c

+23 −3
Original line number Diff line number Diff line
@@ -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);

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