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Subject[PATCH 4/6] DCB: Add interface to query the state of PFC feature.
Date
From: Alexander Duyck <alexander.h.duyck@intel.com>

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>
---
drivers/net/ixgbe/ixgbe_dcb_nl.c | 16 +++++++++++++-
include/linux/dcbnl.h | 2 ++
include/net/dcbnl.h | 2 ++
net/dcb/dcbnl.c | 43 ++++++++++++++++++++++++++++++++++++++
4 files changed, 62 insertions(+), 1 deletions(-)
diff --git a/drivers/net/ixgbe/ixgbe_dcb_nl.c b/drivers/net/ixgbe/ixgbe_dcb_nl.c
index 61e7527..b750323 100644
--- a/drivers/net/ixgbe/ixgbe_dcb_nl.c
+++ b/drivers/net/ixgbe/ixgbe_dcb_nl.c
@@ -401,6 +401,18 @@ 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,
@@ -418,6 +430,8 @@ 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
--- 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
--- 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 9d592b4..8c21a00 100644
--- 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 */
@@ -475,6 +476,40 @@ 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_STATE]);
+
+ netdev->dcbnl_ops->setstate(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)
{
@@ -893,6 +928,14 @@ 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;
}


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