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cxgb4 : Handle dcb enable correctly 

Disabling DCBx in firmware automatically enables DCBx for control via host
lldp agents. Wait for an explicit setstate call from an lldp agents to enable
 DCBx instead.

Fixes: 76bcb31efc ("cxgb4 : Add DCBx support codebase and dcbnl_ops")

Signed-off-by: Anish Bhatt <anish@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Anish Bhatt 2014-10-23 14:37:31 -07:00 committed by David S. Miller
parent 2376c879b8
commit 3bb062613b
2 changed files with 11 additions and 2 deletions
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7
drivers/net/ethernet/chelsio/cxgb4/cxgb4_dcb.c
View File

@ -116,7 +116,6 @@ void cxgb4_dcb_state_fsm(struct net_device *dev,
/* we're going to use Host DCB */
dcb->state = CXGB4_DCB_STATE_HOST;
dcb->supported = CXGB4_DCBX_HOST_SUPPORT;
dcb->enabled = 1;
break;
}
@ -386,6 +385,12 @@ static u8 cxgb4_setstate(struct net_device *dev, u8 enabled)
{
struct port_info *pi = netdev2pinfo(dev);
/* If DCBx is host-managed, dcb is enabled by outside lldp agents */
if (pi->dcb.state == CXGB4_DCB_STATE_HOST) {
pi->dcb.enabled = enabled;
return 0;
}
/* Firmware doesn't provide any mechanism to control the DCB state.
*/
if (enabled != (pi->dcb.state == CXGB4_DCB_STATE_FW_ALLSYNCED))

6
drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
View File

@ -694,7 +694,11 @@ int cxgb4_dcb_enabled(const struct net_device *dev)
#ifdef CONFIG_CHELSIO_T4_DCB
struct port_info *pi = netdev_priv(dev);
return pi->dcb.state == CXGB4_DCB_STATE_FW_ALLSYNCED;
if (!pi->dcb.enabled)
return 0;
return ((pi->dcb.state == CXGB4_DCB_STATE_FW_ALLSYNCED) ||
(pi->dcb.state == CXGB4_DCB_STATE_HOST));
#else
return 0;
#endif