dcbnl: adding DCBX engine capability

Adding an optional DCBX capability and a pair for get-set routines for
setting the device DCBX mode. The DCBX capability is a bit field of
supported attributes. The user is expected to set the DCBX mode with a
subset of the advertised attributes.

This patch is dependent on the following patches:
[net-next-2.6 PATCH 1/3] dcbnl: add support for ieee8021Qaz attributes
[net-next-2.6 PATCH 2/3] dcbnl: add appliction tlv handlers
[net-next-2.6 PATCH 3/3] net_dcb: add application notifiers

Signed-off-by: Shmulik Ravid <shmulikr@broadcom.com>
Acked-by: John Fastabend <john.r.fastabend@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 43 insertions, 0 deletions

diff --git a/net/dcb/dcbnl.c b/net/dcb/dcbnl.c
index 69144125fc4f..8f83ad859d9b 100644
--- a/net/dcb/dcbnl.c
+++ b/net/dcb/dcbnl.c
@@ -68,6 +68,7 @@ static const struct nla_policy dcbnl_rtnl_policy[DCB_ATTR_MAX + 1] = {
         [DCB_ATTR_BCN]         = {.type = NLA_NESTED},
         [DCB_ATTR_APP]         = {.type = NLA_NESTED},
         [DCB_ATTR_IEEE]        = {.type = NLA_NESTED},
+        [DCB_ATTR_DCBX]        = {.type = NLA_U8},
 };
 
 /* DCB priority flow control to User Priority nested attributes */
@@ -124,6 +125,7 @@ static const struct nla_policy dcbnl_cap_nest[DCB_CAP_ATTR_MAX + 1] = {
         [DCB_CAP_ATTR_PFC_TCS] = {.type = NLA_U8},
         [DCB_CAP_ATTR_GSP]     = {.type = NLA_U8},
         [DCB_CAP_ATTR_BCN]     = {.type = NLA_U8},
+        [DCB_CAP_ATTR_DCBX]    = {.type = NLA_U8},
 };
 
 /* DCB capabilities nested attributes. */
@@ -1271,6 +1273,39 @@ nlmsg_failure:
         return -1;
 }
 
+/* DCBX configuration */
+static int dcbnl_getdcbx(struct net_device *netdev, struct nlattr **tb,
+                         u32 pid, u32 seq, u16 flags)
+{
+        int ret = -EINVAL;
+
+        if (!netdev->dcbnl_ops->getdcbx)
+                return ret;
+
+        ret = dcbnl_reply(netdev->dcbnl_ops->getdcbx(netdev), RTM_GETDCB,
+                          DCB_CMD_GDCBX, DCB_ATTR_DCBX, pid, seq, flags);
+
+        return ret;
+}
+
+static int dcbnl_setdcbx(struct net_device *netdev, struct nlattr **tb,
+                         u32 pid, u32 seq, u16 flags)
+{
+        int ret = -EINVAL;
+        u8 value;
+
+        if (!tb[DCB_ATTR_DCBX] || !netdev->dcbnl_ops->setdcbx)
+                return ret;
+
+        value = nla_get_u8(tb[DCB_ATTR_DCBX]);
+
+        ret = dcbnl_reply(netdev->dcbnl_ops->setdcbx(netdev, value),
+                          RTM_SETDCB, DCB_CMD_SDCBX, DCB_ATTR_DCBX,
+                          pid, seq, flags);
+
+        return ret;
+}
+
 static int dcb_doit(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 {
         struct net *net = sock_net(skb->sk);
@@ -1384,6 +1419,14 @@ static int dcb_doit(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
                 ret = dcbnl_ieee_get(netdev, tb, pid, nlh->nlmsg_seq,
                                  nlh->nlmsg_flags);
                 goto out;
+        case DCB_CMD_GDCBX:
+                ret = dcbnl_getdcbx(netdev, tb, pid, nlh->nlmsg_seq,
+                                    nlh->nlmsg_flags);
+                goto out;
+        case DCB_CMD_SDCBX:
+                ret = dcbnl_setdcbx(netdev, tb, pid, nlh->nlmsg_seq,
+                                    nlh->nlmsg_flags);
+                goto out;
         default:
                 goto errout;
         }