ixgbe: DCB, implement 802.1Qaz routines

Implements 802.1Qaz support for ixgbe driver. Additionally,
this adds IEEE_8021QAZ_TSA_{} defines to dcbnl.h this is to
avoid having to use cryptic numeric codes for the TSA type.

Signed-off-by: John Fastabend <john.r.fastabend@intel.com>
Tested-by: Ross Brattain <ross.b.brattain@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 103 insertions, 0 deletions

diff --git a/drivers/net/ixgbe/ixgbe_dcb.c b/drivers/net/ixgbe/ixgbe_dcb.c
index d9bb670ae258..13c962efbfc9 100644
--- a/drivers/net/ixgbe/ixgbe_dcb.c
+++ b/drivers/net/ixgbe/ixgbe_dcb.c
@@ -34,6 +34,42 @@
 #include "ixgbe_dcb_82599.h"
 
 /**
+ * ixgbe_ieee_credits - This calculates the ieee traffic class
+ * credits from the configured bandwidth percentages. Credits
+ * are the smallest unit programable into the underlying
+ * hardware. The IEEE 802.1Qaz specification do not use bandwidth
+ * groups so this is much simplified from the CEE case.
+ */
+s32 ixgbe_ieee_credits(__u8 *bw, __u16 *refill, __u16 *max, int max_frame)
+{
+        int min_percent = 100;
+        int min_credit, multiplier;
+        int i;
+
+        min_credit = ((max_frame / 2) + DCB_CREDIT_QUANTUM - 1) /
+                        DCB_CREDIT_QUANTUM;
+
+        for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
+                if (bw[i] < min_percent && bw[i])
+                        min_percent = bw[i];
+        }
+
+        multiplier = (min_credit / min_percent) + 1;
+
+        /* Find out the hw credits for each TC */
+        for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
+                int val = min(bw[i] * multiplier, MAX_CREDIT_REFILL);
+
+                if (val < min_credit)
+                        val = min_credit;
+                refill[i] = val;
+
+                max[i] = (bw[i] * MAX_CREDIT)/100;
+        }
+        return 0;
+}
+
+/**
  * ixgbe_dcb_calculate_tc_credits - Calculates traffic class credits
  * @ixgbe_dcb_config: Struct containing DCB settings.
  * @direction: Configuring either Tx or Rx.
@@ -236,3 +272,70 @@ s32 ixgbe_dcb_hw_config(struct ixgbe_hw *hw,
         return ret;
 }
 
+/* Helper routines to abstract HW specifics from DCB netlink ops */
+s32 ixgbe_dcb_hw_pfc_config(struct ixgbe_hw *hw, u8 pfc_en)
+{
+        int ret = -EINVAL;
+
+        switch (hw->mac.type) {
+        case ixgbe_mac_82598EB:
+                ret = ixgbe_dcb_config_pfc_82598(hw, pfc_en);
+                break;
+        case ixgbe_mac_82599EB:
+        case ixgbe_mac_X540:
+                ret = ixgbe_dcb_config_pfc_82599(hw, pfc_en);
+                break;
+        default:
+                break;
+        }
+        return ret;
+}
+
+s32 ixgbe_dcb_hw_ets_config(struct ixgbe_hw *hw,
+                            u16 *refill, u16 *max, u8 *bwg_id, u8 *tsa)
+{
+        int i;
+        u8 prio_type[IEEE_8021QAZ_MAX_TCS];
+
+        /* Map TSA onto CEE prio type */
+        for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) {
+                switch (tsa[i]) {
+                case IEEE_8021QAZ_TSA_STRICT:
+                        prio_type[i] = 2;
+                        break;
+                case IEEE_8021QAZ_TSA_ETS:
+                        prio_type[i] = 0;
+                        break;
+                default:
+                        /* Hardware only supports priority strict or
+                         * ETS transmission selection algorithms if
+                         * we receive some other value from dcbnl
+                         * throw an error
+                         */
+                        return -EINVAL;
+                }
+        }
+
+        switch (hw->mac.type) {
+        case ixgbe_mac_82598EB:
+                ixgbe_dcb_config_rx_arbiter_82598(hw, refill, max,
+                                                        prio_type);
+                ixgbe_dcb_config_tx_desc_arbiter_82598(hw, refill, max,
+                                                             bwg_id, prio_type);
+                ixgbe_dcb_config_tx_data_arbiter_82598(hw, refill, max,
+                                                             bwg_id, prio_type);
+                break;
+        case ixgbe_mac_82599EB:
+        case ixgbe_mac_X540:
+                ixgbe_dcb_config_rx_arbiter_82599(hw, refill, max,
+                                                  bwg_id, prio_type);
+                ixgbe_dcb_config_tx_desc_arbiter_82599(hw, refill, max,
+                                                       bwg_id, prio_type);
+                ixgbe_dcb_config_tx_data_arbiter_82599(hw, refill, max,
+                                                       bwg_id, prio_type);
+                break;
+        default:
+                break;
+        }
+        return 0;
+}