DCB: Add support for DCB BCN
Adds an interface to configure the Backward Congestion Notification
(BCN) feature. In a BCN capabale network, congestion notifications
from congested points out in the network can cause the end station
limit the rate of a given traffic flow.
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/net/dcb/dcbnl.c b/net/dcb/dcbnl.c
index 758419c..b2bda3f 100644
--- a/net/dcb/dcbnl.c
+++ b/net/dcb/dcbnl.c
@@ -55,14 +55,15 @@
/* DCB netlink attributes policy */
static struct nla_policy dcbnl_rtnl_policy[DCB_ATTR_MAX + 1] = {
- [DCB_ATTR_IFNAME] = {.type = NLA_STRING, .len = IFNAMSIZ - 1},
- [DCB_ATTR_STATE] = {.type = NLA_U8},
- [DCB_ATTR_PFC_CFG] = {.type = NLA_NESTED},
- [DCB_ATTR_PG_CFG] = {.type = NLA_NESTED},
- [DCB_ATTR_SET_ALL] = {.type = NLA_U8},
+ [DCB_ATTR_IFNAME] = {.type = NLA_NUL_STRING, .len = IFNAMSIZ - 1},
+ [DCB_ATTR_STATE] = {.type = NLA_U8},
+ [DCB_ATTR_PFC_CFG] = {.type = NLA_NESTED},
+ [DCB_ATTR_PG_CFG] = {.type = NLA_NESTED},
+ [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_ATTR_CAP] = {.type = NLA_NESTED},
+ [DCB_ATTR_PFC_STATE] = {.type = NLA_U8},
+ [DCB_ATTR_BCN] = {.type = NLA_NESTED},
};
/* DCB priority flow control to User Priority nested attributes */
@@ -128,6 +129,33 @@
[DCB_NUMTCS_ATTR_PFC] = {.type = NLA_U8},
};
+/* DCB BCN nested attributes. */
+static struct nla_policy dcbnl_bcn_nest[DCB_BCN_ATTR_MAX + 1] = {
+ [DCB_BCN_ATTR_RP_0] = {.type = NLA_U8},
+ [DCB_BCN_ATTR_RP_1] = {.type = NLA_U8},
+ [DCB_BCN_ATTR_RP_2] = {.type = NLA_U8},
+ [DCB_BCN_ATTR_RP_3] = {.type = NLA_U8},
+ [DCB_BCN_ATTR_RP_4] = {.type = NLA_U8},
+ [DCB_BCN_ATTR_RP_5] = {.type = NLA_U8},
+ [DCB_BCN_ATTR_RP_6] = {.type = NLA_U8},
+ [DCB_BCN_ATTR_RP_7] = {.type = NLA_U8},
+ [DCB_BCN_ATTR_RP_ALL] = {.type = NLA_FLAG},
+ [DCB_BCN_ATTR_ALPHA] = {.type = NLA_U32},
+ [DCB_BCN_ATTR_BETA] = {.type = NLA_U32},
+ [DCB_BCN_ATTR_GD] = {.type = NLA_U32},
+ [DCB_BCN_ATTR_GI] = {.type = NLA_U32},
+ [DCB_BCN_ATTR_TMAX] = {.type = NLA_U32},
+ [DCB_BCN_ATTR_TD] = {.type = NLA_U32},
+ [DCB_BCN_ATTR_RMIN] = {.type = NLA_U32},
+ [DCB_BCN_ATTR_W] = {.type = NLA_U32},
+ [DCB_BCN_ATTR_RD] = {.type = NLA_U32},
+ [DCB_BCN_ATTR_RU] = {.type = NLA_U32},
+ [DCB_BCN_ATTR_WRTT] = {.type = NLA_U32},
+ [DCB_BCN_ATTR_RI] = {.type = NLA_U32},
+ [DCB_BCN_ATTR_C] = {.type = NLA_U32},
+ [DCB_BCN_ATTR_ALL] = {.type = NLA_FLAG},
+};
+
/* standard netlink reply call */
static int dcbnl_reply(u8 value, u8 event, u8 cmd, u8 attr, u32 pid,
u32 seq, u16 flags)
@@ -843,6 +871,130 @@
return __dcbnl_pg_setcfg(netdev, tb, pid, seq, flags, 1);
}
+static int dcbnl_bcn_getcfg(struct net_device *netdev, struct nlattr **tb,
+ u32 pid, u32 seq, u16 flags)
+{
+ struct sk_buff *dcbnl_skb;
+ struct nlmsghdr *nlh;
+ struct dcbmsg *dcb;
+ struct nlattr *bcn_nest;
+ struct nlattr *bcn_tb[DCB_BCN_ATTR_MAX + 1];
+ u8 value_byte;
+ u32 value_integer;
+ int ret = -EINVAL;
+ bool getall = false;
+ int i;
+
+ if (!tb[DCB_ATTR_BCN] || !netdev->dcbnl_ops->getbcnrp ||
+ !netdev->dcbnl_ops->getbcncfg)
+ return ret;
+
+ ret = nla_parse_nested(bcn_tb, DCB_BCN_ATTR_MAX,
+ tb[DCB_ATTR_BCN], dcbnl_bcn_nest);
+
+ if (ret)
+ goto err_out;
+
+ dcbnl_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+ if (!dcbnl_skb)
+ goto err_out;
+
+ nlh = NLMSG_NEW(dcbnl_skb, pid, seq, RTM_GETDCB, sizeof(*dcb), flags);
+
+ dcb = NLMSG_DATA(nlh);
+ dcb->dcb_family = AF_UNSPEC;
+ dcb->cmd = DCB_CMD_BCN_GCFG;
+
+ bcn_nest = nla_nest_start(dcbnl_skb, DCB_ATTR_BCN);
+ if (!bcn_nest)
+ goto err;
+
+ if (bcn_tb[DCB_BCN_ATTR_ALL])
+ getall = true;
+
+ for (i = DCB_BCN_ATTR_RP_0; i <= DCB_BCN_ATTR_RP_7; i++) {
+ if (!getall && !bcn_tb[i])
+ continue;
+
+ netdev->dcbnl_ops->getbcnrp(netdev, i - DCB_BCN_ATTR_RP_0,
+ &value_byte);
+ ret = nla_put_u8(dcbnl_skb, i, value_byte);
+ if (ret)
+ goto err_bcn;
+ }
+
+ for (i = DCB_BCN_ATTR_ALPHA; i <= DCB_BCN_ATTR_RI; i++) {
+ if (!getall && !bcn_tb[i])
+ continue;
+
+ netdev->dcbnl_ops->getbcncfg(netdev, i,
+ &value_integer);
+ ret = nla_put_u32(dcbnl_skb, i, value_integer);
+ if (ret)
+ goto err_bcn;
+ }
+
+ nla_nest_end(dcbnl_skb, bcn_nest);
+
+ nlmsg_end(dcbnl_skb, nlh);
+
+ ret = rtnl_unicast(dcbnl_skb, &init_net, pid);
+ if (ret)
+ goto err;
+
+ return 0;
+
+err_bcn:
+ nla_nest_cancel(dcbnl_skb, bcn_nest);
+nlmsg_failure:
+err:
+ kfree(dcbnl_skb);
+err_out:
+ ret = -EINVAL;
+ return ret;
+}
+
+static int dcbnl_bcn_setcfg(struct net_device *netdev, struct nlattr **tb,
+ u32 pid, u32 seq, u16 flags)
+{
+ struct nlattr *data[DCB_BCN_ATTR_MAX + 1];
+ int i;
+ int ret = -EINVAL;
+ u8 value_byte;
+ u32 value_int;
+
+ if (!tb[DCB_ATTR_BCN] || !netdev->dcbnl_ops->setbcncfg
+ || !netdev->dcbnl_ops->setbcnrp)
+ return ret;
+
+ ret = nla_parse_nested(data, DCB_BCN_ATTR_MAX,
+ tb[DCB_ATTR_BCN],
+ dcbnl_pfc_up_nest);
+ if (ret)
+ goto err;
+
+ for (i = DCB_BCN_ATTR_RP_0; i <= DCB_BCN_ATTR_RP_7; i++) {
+ if (data[i] == NULL)
+ continue;
+ value_byte = nla_get_u8(data[i]);
+ netdev->dcbnl_ops->setbcnrp(netdev,
+ data[i]->nla_type - DCB_BCN_ATTR_RP_0, value_byte);
+ }
+
+ for (i = DCB_BCN_ATTR_ALPHA; i <= DCB_BCN_ATTR_RI; i++) {
+ if (data[i] == NULL)
+ continue;
+ value_int = nla_get_u32(data[i]);
+ netdev->dcbnl_ops->setbcncfg(netdev,
+ i, value_int);
+ }
+
+ ret = dcbnl_reply(0, RTM_SETDCB, DCB_CMD_BCN_SCFG, DCB_ATTR_BCN,
+ pid, seq, flags);
+err:
+ return ret;
+}
+
static int dcb_doit(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
{
struct net *net = sock_net(skb->sk);
@@ -891,6 +1043,10 @@
ret = dcbnl_pgrx_getcfg(netdev, tb, pid, nlh->nlmsg_seq,
nlh->nlmsg_flags);
goto out;
+ case DCB_CMD_BCN_GCFG:
+ ret = dcbnl_bcn_getcfg(netdev, tb, pid, nlh->nlmsg_seq,
+ nlh->nlmsg_flags);
+ goto out;
case DCB_CMD_SSTATE:
ret = dcbnl_setstate(netdev, tb, pid, nlh->nlmsg_seq,
nlh->nlmsg_flags);
@@ -932,6 +1088,10 @@
ret = dcbnl_setpfcstate(netdev, tb, pid, nlh->nlmsg_seq,
nlh->nlmsg_flags);
goto out;
+ case DCB_CMD_BCN_SCFG:
+ ret = dcbnl_bcn_setcfg(netdev, tb, pid, nlh->nlmsg_seq,
+ nlh->nlmsg_flags);
+ goto out;
default:
goto errout;
}