3 files changed, 26 insertions, 0 deletions
diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
index a59bb231bea2..e76cf035100b 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
@@ -3397,6 +3397,25 @@ out:
 }
 EXPORT_SYMBOL(cxgb4_sync_txq_pidx);
 
+void cxgb4_disable_db_coalescing(struct net_device *dev)
+{
+	struct adapter *adap;
+
+	adap = netdev2adap(dev);
+	t4_set_reg_field(adap, A_SGE_DOORBELL_CONTROL, F_NOCOALESCE,
+			 F_NOCOALESCE);
+}
+EXPORT_SYMBOL(cxgb4_disable_db_coalescing);
+
+void cxgb4_enable_db_coalescing(struct net_device *dev)
+{
+	struct adapter *adap;
+
+	adap = netdev2adap(dev);
+	t4_set_reg_field(adap, A_SGE_DOORBELL_CONTROL, F_NOCOALESCE, 0);
+}
+EXPORT_SYMBOL(cxgb4_enable_db_coalescing);
+
 static struct pci_driver cxgb4_driver;
 
 static void check_neigh_update(struct neighbour *neigh)
diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_uld.h b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_uld.h
index e2bbc7f3e2de..4faf4d067ee7 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_uld.h
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_uld.h
@@ -269,4 +269,7 @@ struct sk_buff *cxgb4_pktgl_to_skb(const struct pkt_gl *gl,
 				   unsigned int skb_len, unsigned int pull_len);
 int cxgb4_sync_txq_pidx(struct net_device *dev, u16 qid, u16 pidx, u16 size);
 int cxgb4_flush_eq_cache(struct net_device *dev);
+void cxgb4_disable_db_coalescing(struct net_device *dev);
+void cxgb4_enable_db_coalescing(struct net_device *dev);
+
 #endif  /* !__CXGB4_OFLD_H */
diff --git a/drivers/net/ethernet/chelsio/cxgb4/t4_regs.h b/drivers/net/ethernet/chelsio/cxgb4/t4_regs.h
index 22cbcb36d81d..ef146c0ba481 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/t4_regs.h
+++ b/drivers/net/ethernet/chelsio/cxgb4/t4_regs.h
@@ -241,6 +241,10 @@
 #define SGE_DOORBELL_CONTROL 0x10a8
 #define  ENABLE_DROP        (1 << 13)
 
+#define S_NOCOALESCE    26
+#define V_NOCOALESCE(x) ((x) << S_NOCOALESCE)
+#define F_NOCOALESCE    V_NOCOALESCE(1U)
+
 #define SGE_TIMER_VALUE_0_AND_1 0x10b8
 #define  TIMERVALUE0_MASK   0xffff0000U
 #define  TIMERVALUE0_SHIFT  16