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>

diff --git a/drivers/net/ixgbe/ixgbe_dcb_nl.c b/drivers/net/ixgbe/ixgbe_dcb_nl.c
index 5921795..dd940a8 100644 (file)
--- a/drivers/net/ixgbe/ixgbe_dcb_nl.c
+++ b/drivers/net/ixgbe/ixgbe_dcb_nl.c
@@ -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
 };
 

diff --git a/include/linux/dcbnl.h b/include/linux/dcbnl.h
index 1077fba..6cc4560 100644 (file)
--- a/include/linux/dcbnl.h
+++ b/include/linux/dcbnl.h
@@ -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,

diff --git a/include/net/dcbnl.h b/include/net/dcbnl.h
index f0a6528..c7d87ca 100644 (file)
--- a/include/net/dcbnl.h
+++ b/include/net/dcbnl.h
@@ -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__ */

diff --git a/net/dcb/dcbnl.c b/net/dcb/dcbnl.c
index 5ff7e3c..758419c 100644 (file)
--- a/net/dcb/dcbnl.c
+++ b/net/dcb/dcbnl.c
@@ -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 @@ err:
        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;
        }