net/enic: do not flush descriptor cache when opening vNIC

The firmware on new hardware models flushes the global descriptor
cache by default. Use CMD_OPENF_IG_DESCCACHE to avoid cache
flushing. This flag has no effect on older models.

Suggested-by: Govindarajulu Varadarajan <gvaradar@cisco.com>
Signed-off-by: Hyong Youb Kim <hyonkim@cisco.com>
Reviewed-by: John Daley <johndale@cisco.com>

diff --git a/drivers/net/enic/base/vnic_devcmd.h b/drivers/net/enic/base/vnic_devcmd.h
index 6b95bc4..a636245 100644 (file)
--- a/drivers/net/enic/base/vnic_devcmd.h
+++ b/drivers/net/enic/base/vnic_devcmd.h
@@ -600,6 +600,7 @@ enum filter_cap_mode {
 
 /* flags for CMD_OPEN */
 #define CMD_OPENF_OPROM                0x1     /* open coming from option rom */
+#define CMD_OPENF_IG_DESCCACHE 0x2     /* Do not flush IG DESC cache */
 
 /* flags for CMD_INIT */
 #define CMD_INITF_DEFAULT_MAC  0x1     /* init with default mac addr */

diff --git a/drivers/net/enic/enic_main.c b/drivers/net/enic/enic_main.c
index 94e8e68..aaada88 100644 (file)
--- a/drivers/net/enic/enic_main.c
+++ b/drivers/net/enic/enic_main.c
@@ -982,9 +982,10 @@ static int enic_dev_wait(struct vnic_dev *vdev,
 static int enic_dev_open(struct enic *enic)
 {
        int err;
+       int flags = CMD_OPENF_IG_DESCCACHE;
 
        err = enic_dev_wait(enic->vdev, vnic_dev_open,
-               vnic_dev_open_done, 0);
+               vnic_dev_open_done, flags);
        if (err)
                dev_err(enic_get_dev(enic),
                        "vNIC device open failed, err %d\n", err);