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>

1 files changed, 38 insertions, 0 deletions

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;