ixgbe: this patch adds support for DCB to the kernel and ixgbe driver

This adds support for Data Center Bridging (DCB) features in the ixgbe
driver and adds an rtnetlink interface for configuring DCB to the
kernel.  The DCB feature support included are Priority Grouping (PG) -
which allows bandwidth guarantees to be allocated to groups to traffic
based on the 802.1q priority, and Priority Based Flow Control (PFC) -
which introduces a new MAC control PAUSE frame which works at
granularity of the 802.1p priority instead of the link (IEEE 802.3x).

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>

1 files changed, 356 insertions, 0 deletions

diff --git a/drivers/net/ixgbe/ixgbe_dcb_nl.c b/drivers/net/ixgbe/ixgbe_dcb_nl.c
new file mode 100644
index 000000000000..50bff2af6b04
--- /dev/null
+++ b/drivers/net/ixgbe/ixgbe_dcb_nl.c
@@ -0,0 +1,356 @@
+/*******************************************************************************
+
+  Intel 10 Gigabit PCI Express Linux driver
+  Copyright(c) 1999 - 2008 Intel Corporation.
+
+  This program is free software; you can redistribute it and/or modify it
+  under the terms and conditions of the GNU General Public License,
+  version 2, as published by the Free Software Foundation.
+
+  This program is distributed in the hope it will be useful, but WITHOUT
+  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+  more details.
+
+  You should have received a copy of the GNU General Public License along with
+  this program; if not, write to the Free Software Foundation, Inc.,
+  51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+
+  The full GNU General Public License is included in this distribution in
+  the file called "COPYING".
+
+  Contact Information:
+  Linux NICS <linux.nics@intel.com>
+  e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
+  Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
+
+*******************************************************************************/
+
+#include "ixgbe.h"
+#include <linux/dcbnl.h>
+
+/* Callbacks for DCB netlink in the kernel */
+#define BIT_DCB_MODE    0x01
+#define BIT_PFC         0x02
+#define BIT_PG_RX       0x04
+#define BIT_PG_TX       0x08
+
+int ixgbe_copy_dcb_cfg(struct ixgbe_dcb_config *src_dcb_cfg,
+                       struct ixgbe_dcb_config *dst_dcb_cfg, int tc_max)
+{
+        struct tc_configuration *src_tc_cfg = NULL;
+        struct tc_configuration *dst_tc_cfg = NULL;
+        int i;
+
+        if (!src_dcb_cfg || !dst_dcb_cfg)
+                return -EINVAL;
+
+        for (i = DCB_PG_ATTR_TC_0; i < tc_max + DCB_PG_ATTR_TC_0; i++) {
+                src_tc_cfg = &src_dcb_cfg->tc_config[i - DCB_PG_ATTR_TC_0];
+                dst_tc_cfg = &dst_dcb_cfg->tc_config[i - DCB_PG_ATTR_TC_0];
+
+                dst_tc_cfg->path[DCB_TX_CONFIG].prio_type =
+                                src_tc_cfg->path[DCB_TX_CONFIG].prio_type;
+
+                dst_tc_cfg->path[DCB_TX_CONFIG].bwg_id =
+                                src_tc_cfg->path[DCB_TX_CONFIG].bwg_id;
+
+                dst_tc_cfg->path[DCB_TX_CONFIG].bwg_percent =
+                                src_tc_cfg->path[DCB_TX_CONFIG].bwg_percent;
+
+                dst_tc_cfg->path[DCB_TX_CONFIG].up_to_tc_bitmap =
+                                src_tc_cfg->path[DCB_TX_CONFIG].up_to_tc_bitmap;
+
+                dst_tc_cfg->path[DCB_RX_CONFIG].prio_type =
+                                src_tc_cfg->path[DCB_RX_CONFIG].prio_type;
+
+                dst_tc_cfg->path[DCB_RX_CONFIG].bwg_id =
+                                src_tc_cfg->path[DCB_RX_CONFIG].bwg_id;
+
+                dst_tc_cfg->path[DCB_RX_CONFIG].bwg_percent =
+                                src_tc_cfg->path[DCB_RX_CONFIG].bwg_percent;
+
+                dst_tc_cfg->path[DCB_RX_CONFIG].up_to_tc_bitmap =
+                                src_tc_cfg->path[DCB_RX_CONFIG].up_to_tc_bitmap;
+        }
+
+        for (i = DCB_PG_ATTR_BW_ID_0; i < DCB_PG_ATTR_BW_ID_MAX; i++) {
+                dst_dcb_cfg->bw_percentage[DCB_TX_CONFIG]
+                        [i-DCB_PG_ATTR_BW_ID_0] = src_dcb_cfg->bw_percentage
+                                [DCB_TX_CONFIG][i-DCB_PG_ATTR_BW_ID_0];
+                dst_dcb_cfg->bw_percentage[DCB_RX_CONFIG]
+                        [i-DCB_PG_ATTR_BW_ID_0] = src_dcb_cfg->bw_percentage
+                                [DCB_RX_CONFIG][i-DCB_PG_ATTR_BW_ID_0];
+        }
+
+        for (i = DCB_PFC_UP_ATTR_0; i < DCB_PFC_UP_ATTR_MAX; i++) {
+                dst_dcb_cfg->tc_config[i - DCB_PFC_UP_ATTR_0].dcb_pfc =
+                        src_dcb_cfg->tc_config[i - DCB_PFC_UP_ATTR_0].dcb_pfc;
+        }
+
+        return 0;
+}
+
+static u8 ixgbe_dcbnl_get_state(struct net_device *netdev)
+{
+        struct ixgbe_adapter *adapter = netdev_priv(netdev);
+
+        DPRINTK(DRV, INFO, "Get DCB Admin Mode.\n");
+
+        return !!(adapter->flags & IXGBE_FLAG_DCB_ENABLED);
+}
+
+static u16 ixgbe_dcb_select_queue(struct net_device *dev, struct sk_buff *skb)
+{
+        /* All traffic should default to class 0 */
+        return 0;
+}
+
+static void ixgbe_dcbnl_set_state(struct net_device *netdev, u8 state)
+{
+        struct ixgbe_adapter *adapter = netdev_priv(netdev);
+
+        DPRINTK(DRV, INFO, "Set DCB Admin Mode.\n");
+
+        if (state > 0) {
+                /* Turn on DCB */
+                if (adapter->flags & IXGBE_FLAG_DCB_ENABLED) {
+                        return;
+                } else {
+                        if (netif_running(netdev))
+                                netdev->stop(netdev);
+                        ixgbe_reset_interrupt_capability(adapter);
+                        ixgbe_napi_del_all(adapter);
+                        kfree(adapter->tx_ring);
+                        kfree(adapter->rx_ring);
+                        adapter->tx_ring = NULL;
+                        adapter->rx_ring = NULL;
+                        netdev->select_queue = &ixgbe_dcb_select_queue;
+
+                        adapter->flags &= ~IXGBE_FLAG_RSS_ENABLED;
+                        adapter->flags |= IXGBE_FLAG_DCB_ENABLED;
+                        ixgbe_init_interrupt_scheme(adapter);
+                        ixgbe_napi_add_all(adapter);
+                        if (netif_running(netdev))
+                                netdev->open(netdev);
+                }
+        } else {
+                /* Turn off DCB */
+                if (adapter->flags & IXGBE_FLAG_DCB_ENABLED) {
+                        if (netif_running(netdev))
+                                netdev->stop(netdev);
+                        ixgbe_reset_interrupt_capability(adapter);
+                        ixgbe_napi_del_all(adapter);
+                        kfree(adapter->tx_ring);
+                        kfree(adapter->rx_ring);
+                        adapter->tx_ring = NULL;
+                        adapter->rx_ring = NULL;
+                        netdev->select_queue = NULL;
+
+                        adapter->flags &= ~IXGBE_FLAG_DCB_ENABLED;
+                        adapter->flags |= IXGBE_FLAG_RSS_ENABLED;
+                        ixgbe_init_interrupt_scheme(adapter);
+                        ixgbe_napi_add_all(adapter);
+                        if (netif_running(netdev))
+                                netdev->open(netdev);
+                } else {
+                        return;
+                }
+        }
+}
+
+static void ixgbe_dcbnl_get_perm_hw_addr(struct net_device *netdev,
+                                         u8 *perm_addr)
+{
+        struct ixgbe_adapter *adapter = netdev_priv(netdev);
+        int i;
+
+        for (i = 0; i < netdev->addr_len; i++)
+                perm_addr[i] = adapter->hw.mac.perm_addr[i];
+}
+
+static void ixgbe_dcbnl_set_pg_tc_cfg_tx(struct net_device *netdev, int tc,
+                                         u8 prio, u8 bwg_id, u8 bw_pct,
+                                         u8 up_map)
+{
+        struct ixgbe_adapter *adapter = netdev_priv(netdev);
+
+        if (prio != DCB_ATTR_VALUE_UNDEFINED)
+                adapter->temp_dcb_cfg.tc_config[tc].path[0].prio_type = prio;
+        if (bwg_id != DCB_ATTR_VALUE_UNDEFINED)
+                adapter->temp_dcb_cfg.tc_config[tc].path[0].bwg_id = bwg_id;
+        if (bw_pct != DCB_ATTR_VALUE_UNDEFINED)
+                adapter->temp_dcb_cfg.tc_config[tc].path[0].bwg_percent =
+                        bw_pct;
+        if (up_map != DCB_ATTR_VALUE_UNDEFINED)
+                adapter->temp_dcb_cfg.tc_config[tc].path[0].up_to_tc_bitmap =
+                        up_map;
+
+        if ((adapter->temp_dcb_cfg.tc_config[tc].path[0].prio_type !=
+             adapter->dcb_cfg.tc_config[tc].path[0].prio_type) ||
+            (adapter->temp_dcb_cfg.tc_config[tc].path[0].bwg_id !=
+             adapter->dcb_cfg.tc_config[tc].path[0].bwg_id) ||
+            (adapter->temp_dcb_cfg.tc_config[tc].path[0].bwg_percent !=
+             adapter->dcb_cfg.tc_config[tc].path[0].bwg_percent) ||
+            (adapter->temp_dcb_cfg.tc_config[tc].path[0].up_to_tc_bitmap !=
+             adapter->dcb_cfg.tc_config[tc].path[0].up_to_tc_bitmap))
+                adapter->dcb_set_bitmap |= BIT_PG_TX;
+}
+
+static void ixgbe_dcbnl_set_pg_bwg_cfg_tx(struct net_device *netdev, int bwg_id,
+                                          u8 bw_pct)
+{
+        struct ixgbe_adapter *adapter = netdev_priv(netdev);
+
+        adapter->temp_dcb_cfg.bw_percentage[0][bwg_id] = bw_pct;
+
+        if (adapter->temp_dcb_cfg.bw_percentage[0][bwg_id] !=
+            adapter->dcb_cfg.bw_percentage[0][bwg_id])
+                adapter->dcb_set_bitmap |= BIT_PG_RX;
+}
+
+static void ixgbe_dcbnl_set_pg_tc_cfg_rx(struct net_device *netdev, int tc,
+                                         u8 prio, u8 bwg_id, u8 bw_pct,
+                                         u8 up_map)
+{
+        struct ixgbe_adapter *adapter = netdev_priv(netdev);
+
+        if (prio != DCB_ATTR_VALUE_UNDEFINED)
+                adapter->temp_dcb_cfg.tc_config[tc].path[1].prio_type = prio;
+        if (bwg_id != DCB_ATTR_VALUE_UNDEFINED)
+                adapter->temp_dcb_cfg.tc_config[tc].path[1].bwg_id = bwg_id;
+        if (bw_pct != DCB_ATTR_VALUE_UNDEFINED)
+                adapter->temp_dcb_cfg.tc_config[tc].path[1].bwg_percent =
+                        bw_pct;
+        if (up_map != DCB_ATTR_VALUE_UNDEFINED)
+                adapter->temp_dcb_cfg.tc_config[tc].path[1].up_to_tc_bitmap =
+                        up_map;
+
+        if ((adapter->temp_dcb_cfg.tc_config[tc].path[1].prio_type !=
+             adapter->dcb_cfg.tc_config[tc].path[1].prio_type) ||
+            (adapter->temp_dcb_cfg.tc_config[tc].path[1].bwg_id !=
+             adapter->dcb_cfg.tc_config[tc].path[1].bwg_id) ||
+            (adapter->temp_dcb_cfg.tc_config[tc].path[1].bwg_percent !=
+             adapter->dcb_cfg.tc_config[tc].path[1].bwg_percent) ||
+            (adapter->temp_dcb_cfg.tc_config[tc].path[1].up_to_tc_bitmap !=
+             adapter->dcb_cfg.tc_config[tc].path[1].up_to_tc_bitmap))
+                adapter->dcb_set_bitmap |= BIT_PG_RX;
+}
+
+static void ixgbe_dcbnl_set_pg_bwg_cfg_rx(struct net_device *netdev, int bwg_id,
+                                          u8 bw_pct)
+{
+        struct ixgbe_adapter *adapter = netdev_priv(netdev);
+
+        adapter->temp_dcb_cfg.bw_percentage[1][bwg_id] = bw_pct;
+
+        if (adapter->temp_dcb_cfg.bw_percentage[1][bwg_id] !=
+            adapter->dcb_cfg.bw_percentage[1][bwg_id])
+                adapter->dcb_set_bitmap |= BIT_PG_RX;
+}
+
+static void ixgbe_dcbnl_get_pg_tc_cfg_tx(struct net_device *netdev, int tc,
+                                         u8 *prio, u8 *bwg_id, u8 *bw_pct,
+                                         u8 *up_map)
+{
+        struct ixgbe_adapter *adapter = netdev_priv(netdev);
+
+        *prio = adapter->dcb_cfg.tc_config[tc].path[0].prio_type;
+        *bwg_id = adapter->dcb_cfg.tc_config[tc].path[0].bwg_id;
+        *bw_pct = adapter->dcb_cfg.tc_config[tc].path[0].bwg_percent;
+        *up_map = adapter->dcb_cfg.tc_config[tc].path[0].up_to_tc_bitmap;
+}
+
+static void ixgbe_dcbnl_get_pg_bwg_cfg_tx(struct net_device *netdev, int bwg_id,
+                                          u8 *bw_pct)
+{
+        struct ixgbe_adapter *adapter = netdev_priv(netdev);
+
+        *bw_pct = adapter->dcb_cfg.bw_percentage[0][bwg_id];
+}
+
+static void ixgbe_dcbnl_get_pg_tc_cfg_rx(struct net_device *netdev, int tc,
+                                         u8 *prio, u8 *bwg_id, u8 *bw_pct,
+                                         u8 *up_map)
+{
+        struct ixgbe_adapter *adapter = netdev_priv(netdev);
+
+        *prio = adapter->dcb_cfg.tc_config[tc].path[1].prio_type;
+        *bwg_id = adapter->dcb_cfg.tc_config[tc].path[1].bwg_id;
+        *bw_pct = adapter->dcb_cfg.tc_config[tc].path[1].bwg_percent;
+        *up_map = adapter->dcb_cfg.tc_config[tc].path[1].up_to_tc_bitmap;
+}
+
+static void ixgbe_dcbnl_get_pg_bwg_cfg_rx(struct net_device *netdev, int bwg_id,
+                                          u8 *bw_pct)
+{
+        struct ixgbe_adapter *adapter = netdev_priv(netdev);
+
+        *bw_pct = adapter->dcb_cfg.bw_percentage[1][bwg_id];
+}
+
+static void ixgbe_dcbnl_set_pfc_cfg(struct net_device *netdev, int priority,
+                                    u8 setting)
+{
+        struct ixgbe_adapter *adapter = netdev_priv(netdev);
+
+        adapter->temp_dcb_cfg.tc_config[priority].dcb_pfc = setting;
+        if (adapter->temp_dcb_cfg.tc_config[priority].dcb_pfc !=
+            adapter->dcb_cfg.tc_config[priority].dcb_pfc)
+                adapter->dcb_set_bitmap |= BIT_PFC;
+}
+
+static void ixgbe_dcbnl_get_pfc_cfg(struct net_device *netdev, int priority,
+                                    u8 *setting)
+{
+        struct ixgbe_adapter *adapter = netdev_priv(netdev);
+
+        *setting = adapter->dcb_cfg.tc_config[priority].dcb_pfc;
+}
+
+static u8 ixgbe_dcbnl_set_all(struct net_device *netdev)
+{
+        struct ixgbe_adapter *adapter = netdev_priv(netdev);
+        int ret;
+
+        if (!adapter->dcb_set_bitmap)
+                return 1;
+
+        while (test_and_set_bit(__IXGBE_RESETTING, &adapter->state))
+                msleep(1);
+
+        if (netif_running(netdev))
+                ixgbe_down(adapter);
+
+        ret = ixgbe_copy_dcb_cfg(&adapter->temp_dcb_cfg, &adapter->dcb_cfg,
+                                 adapter->ring_feature[RING_F_DCB].indices);
+        if (ret) {
+                clear_bit(__IXGBE_RESETTING, &adapter->state);
+                return ret;
+        }
+
+        if (netif_running(netdev))
+                ixgbe_up(adapter);
+
+        adapter->dcb_set_bitmap = 0x00;
+        clear_bit(__IXGBE_RESETTING, &adapter->state);
+        return ret;
+}
+
+struct dcbnl_rtnl_ops dcbnl_ops = {
+        .getstate       = ixgbe_dcbnl_get_state,
+        .setstate       = ixgbe_dcbnl_set_state,
+        .getpermhwaddr  = ixgbe_dcbnl_get_perm_hw_addr,
+        .setpgtccfgtx   = ixgbe_dcbnl_set_pg_tc_cfg_tx,
+        .setpgbwgcfgtx  = ixgbe_dcbnl_set_pg_bwg_cfg_tx,
+        .setpgtccfgrx   = ixgbe_dcbnl_set_pg_tc_cfg_rx,
+        .setpgbwgcfgrx  = ixgbe_dcbnl_set_pg_bwg_cfg_rx,
+        .getpgtccfgtx   = ixgbe_dcbnl_get_pg_tc_cfg_tx,
+        .getpgbwgcfgtx  = ixgbe_dcbnl_get_pg_bwg_cfg_tx,
+        .getpgtccfgrx   = ixgbe_dcbnl_get_pg_tc_cfg_rx,
+        .getpgbwgcfgrx  = ixgbe_dcbnl_get_pg_bwg_cfg_rx,
+        .setpfccfg      = ixgbe_dcbnl_set_pfc_cfg,
+        .getpfccfg      = ixgbe_dcbnl_get_pfc_cfg,
+        .setall         = ixgbe_dcbnl_set_all
+};
+