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: Alexander Duyck <alexander.h.duyck@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -405,6 +405,18 @@ static u8 ixgbe_dcbnl_setnumtcs(struct net_device *netdev, int tcid, u8 num)
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return -EINVAL;
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}
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static u8 ixgbe_dcbnl_getpfcstate(struct net_device *netdev)
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{
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struct ixgbe_adapter *adapter = netdev_priv(netdev);
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return !!(adapter->flags & IXGBE_FLAG_DCB_ENABLED);
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}
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static void ixgbe_dcbnl_setpfcstate(struct net_device *netdev, u8 state)
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{
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return;
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}
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struct dcbnl_rtnl_ops dcbnl_ops = {
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.getstate = ixgbe_dcbnl_get_state,
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.setstate = ixgbe_dcbnl_set_state,
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@ -422,6 +434,8 @@ struct dcbnl_rtnl_ops dcbnl_ops = {
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.setall = ixgbe_dcbnl_set_all,
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.getcap = ixgbe_dcbnl_getcap,
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.getnumtcs = ixgbe_dcbnl_getnumtcs,
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.setnumtcs = ixgbe_dcbnl_setnumtcs
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.setnumtcs = ixgbe_dcbnl_setnumtcs,
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.getpfcstate = ixgbe_dcbnl_getpfcstate,
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.setpfcstate = ixgbe_dcbnl_setpfcstate
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};
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@ -66,6 +66,8 @@ enum dcbnl_commands {
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DCB_CMD_GCAP,
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DCB_CMD_GNUMTCS,
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DCB_CMD_SNUMTCS,
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DCB_CMD_PFC_GSTATE,
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DCB_CMD_PFC_SSTATE,
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__DCB_CMD_ENUM_MAX,
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DCB_CMD_MAX = __DCB_CMD_ENUM_MAX - 1,
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@ -42,6 +42,8 @@ struct dcbnl_rtnl_ops {
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u8 (*getcap)(struct net_device *, int, u8 *);
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u8 (*getnumtcs)(struct net_device *, int, u8 *);
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u8 (*setnumtcs)(struct net_device *, int, u8);
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u8 (*getpfcstate)(struct net_device *);
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void (*setpfcstate)(struct net_device *, u8);
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};
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#endif /* __NET_DCBNL_H__ */
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@ -62,6 +62,7 @@ static struct nla_policy dcbnl_rtnl_policy[DCB_ATTR_MAX + 1] = {
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[DCB_ATTR_SET_ALL] = {.type = NLA_U8},
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[DCB_ATTR_PERM_HWADDR] = {.type = NLA_FLAG},
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[DCB_ATTR_CAP] = {.type = NLA_NESTED},
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[DCB_ATTR_PFC_STATE] = {.type = NLA_U8},
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};
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/* DCB priority flow control to User Priority nested attributes */
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@ -471,6 +472,40 @@ err:
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return ret;
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}
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static int dcbnl_getpfcstate(struct net_device *netdev, struct nlattr **tb,
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u32 pid, u32 seq, u16 flags)
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{
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int ret = -EINVAL;
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if (!netdev->dcbnl_ops->getpfcstate)
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return ret;
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ret = dcbnl_reply(netdev->dcbnl_ops->getpfcstate(netdev), RTM_GETDCB,
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DCB_CMD_PFC_GSTATE, DCB_ATTR_PFC_STATE,
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pid, seq, flags);
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return ret;
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}
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static int dcbnl_setpfcstate(struct net_device *netdev, struct nlattr **tb,
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u32 pid, u32 seq, u16 flags)
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{
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int ret = -EINVAL;
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u8 value;
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if (!tb[DCB_ATTR_PFC_STATE] || !netdev->dcbnl_ops->setpfcstate)
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return ret;
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value = nla_get_u8(tb[DCB_ATTR_PFC_STATE]);
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netdev->dcbnl_ops->setpfcstate(netdev, value);
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ret = dcbnl_reply(0, RTM_SETDCB, DCB_CMD_PFC_SSTATE, DCB_ATTR_PFC_STATE,
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pid, seq, flags);
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return ret;
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}
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static int __dcbnl_pg_getcfg(struct net_device *netdev, struct nlattr **tb,
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u32 pid, u32 seq, u16 flags, int dir)
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{
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@ -889,6 +924,14 @@ static int dcb_doit(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
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ret = dcbnl_setnumtcs(netdev, tb, pid, nlh->nlmsg_seq,
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nlh->nlmsg_flags);
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goto out;
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case DCB_CMD_PFC_GSTATE:
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ret = dcbnl_getpfcstate(netdev, tb, pid, nlh->nlmsg_seq,
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nlh->nlmsg_flags);
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goto out;
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case DCB_CMD_PFC_SSTATE:
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ret = dcbnl_setpfcstate(netdev, tb, pid, nlh->nlmsg_seq,
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nlh->nlmsg_flags);
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goto out;
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default:
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goto errout;
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}
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