ixgbe: dcb: BIT_APP_UPCHG not set by ixgbe_copy_dcb_cfg()

After this commit:

commit aacc1bea190d731755a65cb8ec31dd756f4e263e
Author: Multanen, Eric W <eric.w.multanen@intel.com>
Date:   Wed Mar 28 07:49:09 2012 +0000

    ixgbe: driver fix for link flap

The BIT_APP_UPCHG bit is no longer set when ixgbe_dcbnl_set_all() is
called. This results in the FCoE app user priority never getting set
and the driver will not configure the tx_rings correctly for FCoE
packets which use the SAN MTU and FCoE offloads.

We resolve this regression by fixing ixgbe_copy_dcb_cfg() to also
check for FCoE application changes. Additionally, we can drop the
IEEE variants of get_dcb_app() because this path is never called
with the IEEE mode enabled.

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>

3 files changed, 22 insertions, 28 deletions

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe.h b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
index 74e192107f9a..81b155589532 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
@@ -574,9 +574,6 @@ extern struct ixgbe_info ixgbe_82599_info;
 extern struct ixgbe_info ixgbe_X540_info;
 #ifdef CONFIG_IXGBE_DCB
 extern const struct dcbnl_rtnl_ops dcbnl_ops;
-extern int ixgbe_copy_dcb_cfg(struct ixgbe_dcb_config *src_dcb_cfg,
-                              struct ixgbe_dcb_config *dst_dcb_cfg,
-                              int tc_max);
 #endif
 
 extern char ixgbe_driver_name[];
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_dcb_nl.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_dcb_nl.c
index 652e4b09546d..32e5c02ff6d0 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_dcb_nl.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_dcb_nl.c
@@ -44,18 +44,26 @@
 #define DCB_NO_HW_CHG   1  /* DCB configuration did not change */
 #define DCB_HW_CHG      2  /* DCB configuration changed, no reset */
 
-int ixgbe_copy_dcb_cfg(struct ixgbe_dcb_config *scfg,
-                       struct ixgbe_dcb_config *dcfg, int tc_max)
+static int ixgbe_copy_dcb_cfg(struct ixgbe_adapter *adapter, int tc_max)
 {
+        struct ixgbe_dcb_config *scfg = &adapter->temp_dcb_cfg;
+        struct ixgbe_dcb_config *dcfg = &adapter->dcb_cfg;
         struct tc_configuration *src = NULL;
         struct tc_configuration *dst = NULL;
         int i, j;
         int tx = DCB_TX_CONFIG;
         int rx = DCB_RX_CONFIG;
         int changes = 0;
+#ifdef IXGBE_FCOE
+        struct dcb_app app = {
+                              .selector = DCB_APP_IDTYPE_ETHTYPE,
+                              .protocol = ETH_P_FCOE,
+                             };
+        u8 up = dcb_getapp(adapter->netdev, &app);
 
-        if (!scfg || !dcfg)
-                return changes;
+        if (up && !(up & (1 << adapter->fcoe.up)))
+                changes |= BIT_APP_UPCHG;
+#endif
 
         for (i = DCB_PG_ATTR_TC_0; i < tc_max + DCB_PG_ATTR_TC_0; i++) {
                 src = &scfg->tc_config[i - DCB_PG_ATTR_TC_0];
@@ -332,28 +340,12 @@ static u8 ixgbe_dcbnl_set_all(struct net_device *netdev)
         struct ixgbe_adapter *adapter = netdev_priv(netdev);
         int ret = DCB_NO_HW_CHG;
         int i;
-#ifdef IXGBE_FCOE
-        struct dcb_app app = {
-                              .selector = DCB_APP_IDTYPE_ETHTYPE,
-                              .protocol = ETH_P_FCOE,
-                             };
-        u8 up;
-
-        /* In IEEE mode, use the IEEE Ethertype selector value */
-        if (adapter->dcbx_cap & DCB_CAP_DCBX_VER_IEEE) {
-                app.selector = IEEE_8021QAZ_APP_SEL_ETHERTYPE;
-                up = dcb_ieee_getapp_mask(netdev, &app);
-        } else {
-                up = dcb_getapp(netdev, &app);
-        }
-#endif
 
         /* Fail command if not in CEE mode */
         if (!(adapter->dcbx_cap & DCB_CAP_DCBX_VER_CEE))
                 return ret;
 
-        adapter->dcb_set_bitmap |= ixgbe_copy_dcb_cfg(&adapter->temp_dcb_cfg,
-                                                      &adapter->dcb_cfg,
+        adapter->dcb_set_bitmap |= ixgbe_copy_dcb_cfg(adapter,
                                                       MAX_TRAFFIC_CLASS);
         if (!adapter->dcb_set_bitmap)
                 return ret;
@@ -440,8 +432,13 @@ static u8 ixgbe_dcbnl_set_all(struct net_device *netdev)
          * FCoE is using changes. This happens if the APP info
          * changes or the up2tc mapping is updated.
          */
-        if ((up && !(up & (1 << adapter->fcoe.up))) ||
-            (adapter->dcb_set_bitmap & BIT_APP_UPCHG)) {
+        if (adapter->dcb_set_bitmap & BIT_APP_UPCHG) {
+                struct dcb_app app = {
+                                      .selector = DCB_APP_IDTYPE_ETHTYPE,
+                                      .protocol = ETH_P_FCOE,
+                                     };
+                u8 up = dcb_getapp(netdev, &app);
+
                 adapter->fcoe.up = ffs(up) - 1;
                 ixgbe_dcbnl_devreset(netdev);
                 ret = DCB_HW_CHG_RST;
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index d9dbf871abb8..50f0700d250d 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -4418,8 +4418,8 @@ static int __devinit ixgbe_sw_init(struct ixgbe_adapter *adapter)
         adapter->dcb_cfg.pfc_mode_enable = false;
         adapter->dcb_set_bitmap = 0x00;
         adapter->dcbx_cap = DCB_CAP_DCBX_HOST | DCB_CAP_DCBX_VER_CEE;
-        ixgbe_copy_dcb_cfg(&adapter->dcb_cfg, &adapter->temp_dcb_cfg,
-                           MAX_TRAFFIC_CLASS);
+        memcpy(&adapter->temp_dcb_cfg, &adapter->dcb_cfg,
+               sizeof(adapter->temp_dcb_cfg));
 
 #endif