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Commit 0eb3aa9b authored by Alexander Duyck's avatar Alexander Duyck Committed by David S. Miller
Browse files

DCB: Add interface to query the state of PFC feature. 



Adds a netlink interface for Data Center Bridging (DCB) to get and set
the enable state of the Priority Flow Control (PFC) feature.
Primarily, this is a way to turn off PFC in the driver while DCB
remains enabled.

Signed-off-by: default avatarAlexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: default avatarPeter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 33dbabc4

drivers/net/ixgbe/ixgbe_dcb_nl.c

+15 −1
Original line number Diff line number Diff line
@@ -405,6 +405,18 @@ static u8 ixgbe_dcbnl_setnumtcs(struct net_device *netdev, int tcid, u8 num) 
	return -EINVAL;

}



static u8 ixgbe_dcbnl_getpfcstate(struct net_device *netdev)

{

	struct ixgbe_adapter *adapter = netdev_priv(netdev);



	return !!(adapter->flags & IXGBE_FLAG_DCB_ENABLED);

}



static void ixgbe_dcbnl_setpfcstate(struct net_device *netdev, u8 state)

{

	return;

}



struct dcbnl_rtnl_ops dcbnl_ops = {

	.getstate	= ixgbe_dcbnl_get_state,

	.setstate	= ixgbe_dcbnl_set_state,
@@ -422,6 +434,8 @@ struct dcbnl_rtnl_ops dcbnl_ops = { 
	.setall		= ixgbe_dcbnl_set_all,

	.getcap		= ixgbe_dcbnl_getcap,

	.getnumtcs	= ixgbe_dcbnl_getnumtcs,

	.setnumtcs	= ixgbe_dcbnl_setnumtcs

	.setnumtcs	= ixgbe_dcbnl_setnumtcs,

	.getpfcstate	= ixgbe_dcbnl_getpfcstate,

	.setpfcstate	= ixgbe_dcbnl_setpfcstate

};

include/linux/dcbnl.h

+2 −0
Original line number Diff line number Diff line
@@ -66,6 +66,8 @@ enum dcbnl_commands { 
	DCB_CMD_GCAP,

	DCB_CMD_GNUMTCS,

	DCB_CMD_SNUMTCS,

	DCB_CMD_PFC_GSTATE,

	DCB_CMD_PFC_SSTATE,



	__DCB_CMD_ENUM_MAX,

	DCB_CMD_MAX = __DCB_CMD_ENUM_MAX - 1,

include/net/dcbnl.h

+2 −0
Original line number Diff line number Diff line
@@ -42,6 +42,8 @@ struct dcbnl_rtnl_ops { 
	u8   (*getcap)(struct net_device *, int, u8 *);

	u8   (*getnumtcs)(struct net_device *, int, u8 *);

	u8   (*setnumtcs)(struct net_device *, int, u8);

	u8   (*getpfcstate)(struct net_device *);

	void (*setpfcstate)(struct net_device *, u8);

};



#endif /* __NET_DCBNL_H__ */

net/dcb/dcbnl.c

+43 −0
Original line number Diff line number Diff line
@@ -62,6 +62,7 @@ static struct nla_policy dcbnl_rtnl_policy[DCB_ATTR_MAX + 1] = { 
	[DCB_ATTR_SET_ALL]   = {.type = NLA_U8},

	[DCB_ATTR_PERM_HWADDR] = {.type = NLA_FLAG},

	[DCB_ATTR_CAP]       = {.type = NLA_NESTED},

	[DCB_ATTR_PFC_STATE] = {.type = NLA_U8},

};



/* DCB priority flow control to User Priority nested attributes */
@@ -471,6 +472,40 @@ static int dcbnl_setnumtcs(struct net_device *netdev, struct nlattr **tb, 
	return ret;

}



static int dcbnl_getpfcstate(struct net_device *netdev, struct nlattr **tb,

                             u32 pid, u32 seq, u16 flags)

{

	int ret = -EINVAL;



	if (!netdev->dcbnl_ops->getpfcstate)

		return ret;



	ret = dcbnl_reply(netdev->dcbnl_ops->getpfcstate(netdev), RTM_GETDCB,

	                  DCB_CMD_PFC_GSTATE, DCB_ATTR_PFC_STATE,

	                  pid, seq, flags);



	return ret;

}



static int dcbnl_setpfcstate(struct net_device *netdev, struct nlattr **tb,

                             u32 pid, u32 seq, u16 flags)

{

	int ret = -EINVAL;

	u8 value;



	if (!tb[DCB_ATTR_PFC_STATE] || !netdev->dcbnl_ops->setpfcstate)

		return ret;



	value = nla_get_u8(tb[DCB_ATTR_PFC_STATE]);



	netdev->dcbnl_ops->setpfcstate(netdev, value);



	ret = dcbnl_reply(0, RTM_SETDCB, DCB_CMD_PFC_SSTATE, DCB_ATTR_PFC_STATE,

	                  pid, seq, flags);



	return ret;

}



static int __dcbnl_pg_getcfg(struct net_device *netdev, struct nlattr **tb,

                             u32 pid, u32 seq, u16 flags, int dir)

{
@@ -889,6 +924,14 @@ static int dcb_doit(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 
		ret = dcbnl_setnumtcs(netdev, tb, pid, nlh->nlmsg_seq,

		                      nlh->nlmsg_flags);

		goto out;

	case DCB_CMD_PFC_GSTATE:

		ret = dcbnl_getpfcstate(netdev, tb, pid, nlh->nlmsg_seq,

		                        nlh->nlmsg_flags);

		goto out;

	case DCB_CMD_PFC_SSTATE:

		ret = dcbnl_setpfcstate(netdev, tb, pid, nlh->nlmsg_seq,

		                        nlh->nlmsg_flags);

		goto out;

	default:

		goto errout;

	}