bnxt_en: Support CQE coalescing mode in ethtool

Support showing and setting the CQE mode in ethtool.
Reviewed-by: Edwin Peer <edwin.peer@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c

@@ -68,6 +68,9 @@ static int bnxt_get_coalesce(struct net_device *dev,
 	coal->rx_max_coalesced_frames = hw_coal->coal_bufs / mult;
 	coal->rx_coalesce_usecs_irq = hw_coal->coal_ticks_irq;
 	coal->rx_max_coalesced_frames_irq = hw_coal->coal_bufs_irq / mult;
+	if (hw_coal->flags &
+	    RING_CMPL_RING_CFG_AGGINT_PARAMS_REQ_FLAGS_TIMER_RESET)
+		kernel_coal->use_cqe_mode_rx = true;
 
 	hw_coal = &bp->tx_coal;
 	mult = hw_coal->bufs_per_record;
@@ -75,6 +78,9 @@ static int bnxt_get_coalesce(struct net_device *dev,
 	coal->tx_max_coalesced_frames = hw_coal->coal_bufs / mult;
 	coal->tx_coalesce_usecs_irq = hw_coal->coal_ticks_irq;
 	coal->tx_max_coalesced_frames_irq = hw_coal->coal_bufs_irq / mult;
+	if (hw_coal->flags &
+	    RING_CMPL_RING_CFG_AGGINT_PARAMS_REQ_FLAGS_TIMER_RESET)
+		kernel_coal->use_cqe_mode_tx = true;
 
 	coal->stats_block_coalesce_usecs = bp->stats_coal_ticks;
 
@@ -101,12 +107,22 @@ static int bnxt_set_coalesce(struct net_device *dev,
 		}
 	}
 
+	if ((kernel_coal->use_cqe_mode_rx || kernel_coal->use_cqe_mode_tx) &&
+	    !(bp->coal_cap.cmpl_params &
+	      RING_AGGINT_QCAPS_RESP_CMPL_PARAMS_TIMER_RESET))
+		return -EOPNOTSUPP;
+
 	hw_coal = &bp->rx_coal;
 	mult = hw_coal->bufs_per_record;
 	hw_coal->coal_ticks = coal->rx_coalesce_usecs;
 	hw_coal->coal_bufs = coal->rx_max_coalesced_frames * mult;
 	hw_coal->coal_ticks_irq = coal->rx_coalesce_usecs_irq;
 	hw_coal->coal_bufs_irq = coal->rx_max_coalesced_frames_irq * mult;
+	hw_coal->flags &=
+		~RING_CMPL_RING_CFG_AGGINT_PARAMS_REQ_FLAGS_TIMER_RESET;
+	if (kernel_coal->use_cqe_mode_rx)
+		hw_coal->flags |=
+			RING_CMPL_RING_CFG_AGGINT_PARAMS_REQ_FLAGS_TIMER_RESET;
 
 	hw_coal = &bp->tx_coal;
 	mult = hw_coal->bufs_per_record;
@@ -114,6 +130,11 @@ static int bnxt_set_coalesce(struct net_device *dev,
 	hw_coal->coal_bufs = coal->tx_max_coalesced_frames * mult;
 	hw_coal->coal_ticks_irq = coal->tx_coalesce_usecs_irq;
 	hw_coal->coal_bufs_irq = coal->tx_max_coalesced_frames_irq * mult;
+	hw_coal->flags &=
+		~RING_CMPL_RING_CFG_AGGINT_PARAMS_REQ_FLAGS_TIMER_RESET;
+	if (kernel_coal->use_cqe_mode_tx)
+		hw_coal->flags |=
+			RING_CMPL_RING_CFG_AGGINT_PARAMS_REQ_FLAGS_TIMER_RESET;
 
 	if (bp->stats_coal_ticks != coal->stats_block_coalesce_usecs) {
 		u32 stats_ticks = coal->stats_block_coalesce_usecs;
@@ -3921,7 +3942,8 @@ const struct ethtool_ops bnxt_ethtool_ops = {
 				     ETHTOOL_COALESCE_USECS_IRQ |
 				     ETHTOOL_COALESCE_MAX_FRAMES_IRQ |
 				     ETHTOOL_COALESCE_STATS_BLOCK_USECS |
-				     ETHTOOL_COALESCE_USE_ADAPTIVE_RX,
+				     ETHTOOL_COALESCE_USE_ADAPTIVE_RX |
+				     ETHTOOL_COALESCE_USE_CQE,
 	.get_link_ksettings	= bnxt_get_link_ksettings,
 	.set_link_ksettings	= bnxt_set_link_ksettings,
 	.get_fec_stats		= bnxt_get_fec_stats,