enic: Use a lighter reset operation for enic devices

The port profile information for a dynamic enic device is set by the upper
layers, that are oblivious to the device reset operation. We do not want a
reset operation erase the network state of a dynamic enic device as there
is no way to set up the port profile information again. Hence a lighter
reset operation called hang reset is used. Hang reset, unlike soft reset
does not reset the network state and resets the host side state only.

Signed-off-by: Scott Feldman <scofeldm@cisco.com>
Signed-off-by: Vasanthy Kolluri <vkolluri@cisco.com>
Signed-off-by: Roopa Prabhu <roprabhu@cisco.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 55 insertions, 8 deletions

diff --git a/drivers/net/enic/enic_main.c b/drivers/net/enic/enic_main.c
index 7f98af1eb1ea..d7434b7b4c52 100644
--- a/drivers/net/enic/enic_main.c
+++ b/drivers/net/enic/enic_main.c
@@ -812,9 +812,10 @@ static struct net_device_stats *enic_get_stats(struct net_device *netdev)
         return net_stats;
 }
 
-static void enic_reset_mcaddrs(struct enic *enic)
+static void enic_reset_multicast_list(struct enic *enic)
 {
         enic->mc_count = 0;
+        enic->flags = 0;
 }
 
 static int enic_set_mac_addr(struct net_device *netdev, char *addr)
@@ -1847,15 +1848,15 @@ static int enic_dev_open(struct enic *enic)
         return err;
 }
 
-static int enic_dev_soft_reset(struct enic *enic)
+static int enic_dev_hang_reset(struct enic *enic)
 {
         int err;
 
-        err = enic_dev_wait(enic->vdev, vnic_dev_soft_reset,
-                vnic_dev_soft_reset_done, 0);
+        err = enic_dev_wait(enic->vdev, vnic_dev_hang_reset,
+                vnic_dev_hang_reset_done, 0);
         if (err)
                 printk(KERN_ERR PFX
-                        "vNIC soft reset failed, err %d.\n", err);
+                        "vNIC hang reset failed, err %d.\n", err);
 
         return err;
 }
@@ -1906,9 +1907,8 @@ static void enic_reset(struct work_struct *work)
         spin_unlock(&enic->devcmd_lock);
 
         enic_stop(enic->netdev);
-        enic_dev_soft_reset(enic);
-        vnic_dev_init(enic->vdev, 0);
-        enic_reset_mcaddrs(enic);
+        enic_dev_hang_reset(enic);
+        enic_reset_multicast_list(enic);
         enic_init_vnic_resources(enic);
         enic_set_niccfg(enic);
         enic_dev_set_ig_vlan_rewrite_mode(enic);
diff --git a/drivers/net/enic/vnic_dev.c b/drivers/net/enic/vnic_dev.c
index e3742faa06fe..c93012f2faa9 100644
--- a/drivers/net/enic/vnic_dev.c
+++ b/drivers/net/enic/vnic_dev.c
@@ -486,6 +486,44 @@ int vnic_dev_soft_reset_done(struct vnic_dev *vdev, int *done)
         return 0;
 }
 
+int vnic_dev_hang_reset(struct vnic_dev *vdev, int arg)
+{
+        u64 a0 = (u32)arg, a1 = 0;
+        int wait = 1000;
+        int err;
+
+        err = vnic_dev_cmd(vdev, CMD_HANG_RESET, &a0, &a1, wait);
+        if (err == ERR_ECMDUNKNOWN) {
+                err = vnic_dev_soft_reset(vdev, arg);
+                if (err)
+                        return err;
+
+                return vnic_dev_init(vdev, 0);
+        }
+
+        return err;
+}
+
+int vnic_dev_hang_reset_done(struct vnic_dev *vdev, int *done)
+{
+        u64 a0 = 0, a1 = 0;
+        int wait = 1000;
+        int err;
+
+        *done = 0;
+
+        err = vnic_dev_cmd(vdev, CMD_HANG_RESET_STATUS, &a0, &a1, wait);
+        if (err) {
+                if (err == ERR_ECMDUNKNOWN)
+                        return vnic_dev_soft_reset_done(vdev, done);
+                return err;
+        }
+
+        *done = (a0 == 0);
+
+        return 0;
+}
+
 int vnic_dev_hang_notify(struct vnic_dev *vdev)
 {
         u64 a0, a1;
diff --git a/drivers/net/enic/vnic_dev.h b/drivers/net/enic/vnic_dev.h
index 780c3cd73292..4980615fcee2 100644
--- a/drivers/net/enic/vnic_dev.h
+++ b/drivers/net/enic/vnic_dev.h
@@ -129,6 +129,8 @@ int vnic_dev_init_prov(struct vnic_dev *vdev, u8 *buf, u32 len);
 int vnic_dev_deinit(struct vnic_dev *vdev);
 int vnic_dev_soft_reset(struct vnic_dev *vdev, int arg);
 int vnic_dev_soft_reset_done(struct vnic_dev *vdev, int *done);
+int vnic_dev_hang_reset(struct vnic_dev *vdev, int arg);
+int vnic_dev_hang_reset_done(struct vnic_dev *vdev, int *done);
 void vnic_dev_set_intr_mode(struct vnic_dev *vdev,
         enum vnic_dev_intr_mode intr_mode);
 enum vnic_dev_intr_mode vnic_dev_get_intr_mode(struct vnic_dev *vdev);
diff --git a/drivers/net/enic/vnic_devcmd.h b/drivers/net/enic/vnic_devcmd.h
index c5ff4ff2ed26..1c4fb35671fa 100644
--- a/drivers/net/enic/vnic_devcmd.h
+++ b/drivers/net/enic/vnic_devcmd.h
@@ -212,6 +212,13 @@ enum vnic_devcmd_cmd {
          */
         CMD_IAR                 = _CMDCNW(_CMD_DIR_WRITE, _CMD_VTYPE_ALL, 38),
 
+        /* initiate hangreset, like softreset after hang detected */
+        CMD_HANG_RESET          = _CMDC(_CMD_DIR_NONE, _CMD_VTYPE_ALL, 39),
+
+        /* hangreset status:
+         *    out: a0=0 reset complete, a0=1 reset in progress */
+        CMD_HANG_RESET_STATUS   = _CMDC(_CMD_DIR_READ, _CMD_VTYPE_ALL, 40),
+
         /*
          * Set hw ingress packet vlan rewrite mode:
          * in:  (u32)a0=new vlan rewrite mode