enic: workaround A0 erratum

A0 revision ASIC has an erratum on the RQ desc cache on chip where the
cache can become corrupted causing pkt buf writes to wrong locations.  The s/w
workaround is to post a dummy RQ desc in the ring every 32 descs, causing a
flush of the cache.  A0 parts are not production, but there are enough of
these parts in the wild in test setups to warrant including workaround.  A1
revision ASIC parts fix erratum.

Signed-off-by: Scott Feldman <scofeldm@cisco.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/net/enic/vnic_dev.h b/drivers/net/enic/vnic_dev.h
index d960edb8cdf5..db1d63e0b97c 100644
--- a/drivers/net/enic/vnic_dev.h
+++ b/drivers/net/enic/vnic_dev.h
@@ -41,6 +41,12 @@ static inline void writeq(u64 val, void __iomem *reg)
 }
 #endif
 
+enum vnic_dev_hw_version {
+        VNIC_DEV_HW_VER_UNKNOWN,
+        VNIC_DEV_HW_VER_A1,
+        VNIC_DEV_HW_VER_A2,
+};
+
 enum vnic_dev_intr_mode {
         VNIC_DEV_INTR_MODE_UNKNOWN,
         VNIC_DEV_INTR_MODE_INTX,
@@ -88,6 +94,8 @@ int vnic_dev_cmd(struct vnic_dev *vdev, enum vnic_devcmd_cmd cmd,
         u64 *a0, u64 *a1, int wait);
 int vnic_dev_fw_info(struct vnic_dev *vdev,
         struct vnic_devcmd_fw_info **fw_info);
+int vnic_dev_hw_version(struct vnic_dev *vdev,
+        enum vnic_dev_hw_version *hw_ver);
 int vnic_dev_spec(struct vnic_dev *vdev, unsigned int offset, unsigned int size,
         void *value);
 int vnic_dev_stats_clear(struct vnic_dev *vdev);