ixgbe: Allow Priority Flow Control settings to survive a device reset

When changing DCB parameters, ixgbe needs to have the MAC reset.  The way
the flow control code is setup today, PFC will be disabled on a reset.
This patch adds a new flow control type for PFC, and then has the netlink
layer take care of toggling which type of flow control to enable.

Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ixgbe/ixgbe_common.c b/drivers/net/ixgbe/ixgbe_common.c
index 245db0e..8cfd3fd 100644 (file)
--- a/drivers/net/ixgbe/ixgbe_common.c
+++ b/drivers/net/ixgbe/ixgbe_common.c
@@ -1654,9 +1654,10 @@ s32 ixgbe_fc_enable(struct ixgbe_hw *hw, s32 packetbuf_num)
         * 0: Flow control is completely disabled
         * 1: Rx flow control is enabled (we can receive pause frames,
         *    but not send pause frames).
-        * 2:  Tx flow control is enabled (we can send pause frames but
-        *     we do not support receiving pause frames).
+        * 2: Tx flow control is enabled (we can send pause frames but
+        *    we do not support receiving pause frames).
         * 3: Both Rx and Tx flow control (symmetric) are enabled.
+        * 4: Priority Flow Control is enabled.
         * other: Invalid.
         */
        switch (hw->fc.current_mode) {
@@ -1686,6 +1687,11 @@ s32 ixgbe_fc_enable(struct ixgbe_hw *hw, s32 packetbuf_num)
                mflcn_reg |= IXGBE_MFLCN_RFCE;
                fccfg_reg |= IXGBE_FCCFG_TFCE_802_3X;
                break;
+#ifdef CONFIG_DCB
+       case ixgbe_fc_pfc:
+               goto out;
+               break;
+#endif
        default:
                hw_dbg(hw, "Flow control param set incorrectly\n");
                ret_val = -IXGBE_ERR_CONFIG;
@@ -1746,6 +1752,7 @@ s32 ixgbe_fc_autoneg(struct ixgbe_hw *hw)
         * 2:  Tx flow control is enabled (we can send pause frames but
         *     we do not support receiving pause frames).
         * 3:  Both Rx and Tx flow control (symmetric) are enabled.
+        * 4:  Priority Flow Control is enabled.
         * other: Invalid.
         */
        switch (hw->fc.current_mode) {
@@ -1776,6 +1783,11 @@ s32 ixgbe_fc_autoneg(struct ixgbe_hw *hw)
                /* Flow control (both Rx and Tx) is enabled by SW override. */
                reg |= (IXGBE_PCS1GANA_SYM_PAUSE | IXGBE_PCS1GANA_ASM_PAUSE);
                break;
+#ifdef CONFIG_DCB
+       case ixgbe_fc_pfc:
+               goto out;
+               break;
+#endif
        default:
                hw_dbg(hw, "Flow control param set incorrectly\n");
                ret_val = -IXGBE_ERR_CONFIG;
@@ -1874,6 +1886,13 @@ s32 ixgbe_setup_fc_generic(struct ixgbe_hw *hw, s32 packetbuf_num)
        ixgbe_link_speed speed;
        bool link_up;
 
+#ifdef CONFIG_DCB
+       if (hw->fc.requested_mode == ixgbe_fc_pfc) {
+               hw->fc.current_mode = hw->fc.requested_mode;
+               goto out;
+       }
+
+#endif
        /* Validate the packetbuf configuration */
        if (packetbuf_num < 0 || packetbuf_num > 7) {
                hw_dbg(hw, "Invalid packet buffer number [%d], expected range "

diff --git a/drivers/net/ixgbe/ixgbe_dcb_82598.c b/drivers/net/ixgbe/ixgbe_dcb_82598.c
index df35955..6220627 100644 (file)
--- a/drivers/net/ixgbe/ixgbe_dcb_82598.c
+++ b/drivers/net/ixgbe/ixgbe_dcb_82598.c
@@ -298,7 +298,6 @@ s32 ixgbe_dcb_config_pfc_82598(struct ixgbe_hw *hw,
        reg = IXGBE_READ_REG(hw, IXGBE_RMCS);
        reg &= ~IXGBE_RMCS_TFCE_802_3X;
        /* correct the reporting of our flow control status */
-       hw->fc.current_mode = ixgbe_fc_none;
        reg |= IXGBE_RMCS_TFCE_PRIORITY;
        IXGBE_WRITE_REG(hw, IXGBE_RMCS, reg);
 

diff --git a/drivers/net/ixgbe/ixgbe_dcb_82599.c b/drivers/net/ixgbe/ixgbe_dcb_82599.c
index adcbac4..470b676 100644 (file)
--- a/drivers/net/ixgbe/ixgbe_dcb_82599.c
+++ b/drivers/net/ixgbe/ixgbe_dcb_82599.c
@@ -299,9 +299,6 @@ s32 ixgbe_dcb_config_pfc_82599(struct ixgbe_hw *hw,
                goto out;
        }
 
-       /* PFC is mutually exclusive with link flow control */
-       hw->fc.current_mode = ixgbe_fc_none;
-
        /* Configure PFC Tx thresholds per TC */
        for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
                /* Config and remember Tx */

diff --git a/drivers/net/ixgbe/ixgbe_dcb_nl.c b/drivers/net/ixgbe/ixgbe_dcb_nl.c
index 8a9939e..0a8731f 100644 (file)
--- a/drivers/net/ixgbe/ixgbe_dcb_nl.c
+++ b/drivers/net/ixgbe/ixgbe_dcb_nl.c
@@ -130,6 +130,7 @@ static u8 ixgbe_dcbnl_set_state(struct net_device *netdev, u8 state)
                adapter->tx_ring = NULL;
                adapter->rx_ring = NULL;
 
+               adapter->hw.fc.requested_mode = ixgbe_fc_pfc;
                adapter->flags &= ~IXGBE_FLAG_RSS_ENABLED;
                adapter->flags |= IXGBE_FLAG_DCB_ENABLED;
                ixgbe_init_interrupt_scheme(adapter);
@@ -138,6 +139,7 @@ static u8 ixgbe_dcbnl_set_state(struct net_device *netdev, u8 state)
        } else {
                /* Turn off DCB */
                if (adapter->flags & IXGBE_FLAG_DCB_ENABLED) {
+                       adapter->hw.fc.requested_mode = ixgbe_fc_default;
                        if (netif_running(netdev))
                                netdev->netdev_ops->ndo_stop(netdev);
                        ixgbe_reset_interrupt_capability(adapter);

diff --git a/drivers/net/ixgbe/ixgbe_type.h b/drivers/net/ixgbe/ixgbe_type.h
index 95fc36c..2b2ecba 100644 (file)
--- a/drivers/net/ixgbe/ixgbe_type.h
+++ b/drivers/net/ixgbe/ixgbe_type.h
@@ -1939,6 +1939,9 @@ enum ixgbe_fc_mode {
        ixgbe_fc_rx_pause,
        ixgbe_fc_tx_pause,
        ixgbe_fc_full,
+#ifdef CONFIG_DCB
+       ixgbe_fc_pfc,
+#endif
        ixgbe_fc_default
 };