qed: Add support for coalescing config read/update.

This patch adds support for configuring the device tx/rx coalescing
timeout values in the order of micro seconds. It also adds APIs for
upper layer drivers for reading/updating the coalescing values.

Signed-off-by: Sudarsana Reddy Kalluru <sudarsana.kalluru@qlogic.com>
Signed-off-by: Yuval Mintz <Yuval.Mintz@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/qed/qed_if.h b/include/linux/qed/qed_if.h
index e1d5122..b1e3c57 100644
--- a/include/linux/qed/qed_if.h
+++ b/include/linux/qed/qed_if.h
@@ -489,6 +489,30 @@
 				      struct qed_chain *p_chain);
 
 /**
+ * @brief get_coalesce - Get coalesce parameters in usec
+ *
+ * @param cdev
+ * @param rx_coal - Rx coalesce value in usec
+ * @param tx_coal - Tx coalesce value in usec
+ *
+ */
+	void (*get_coalesce)(struct qed_dev *cdev, u16 *rx_coal, u16 *tx_coal);
+
+/**
+ * @brief set_coalesce - Configure Rx coalesce value in usec
+ *
+ * @param cdev
+ * @param rx_coal - Rx coalesce value in usec
+ * @param tx_coal - Tx coalesce value in usec
+ * @param qid - Queue index
+ * @param sb_id - Status Block Id
+ *
+ * @return 0 on success, error otherwise.
+ */
+	int (*set_coalesce)(struct qed_dev *cdev, u16 rx_coal, u16 tx_coal,
+			    u8 qid, u16 sb_id);
+
+/**
  * @brief set_led - Configure LED mode
  *
  * @param cdev