netdev - [RFC 4/5] i40e/ethtool: support coalesce getting by queue

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Date:	Thu, 17 Dec 2015 06:51:20 +0000
From:	kan.liang@...el.com
To:	netdev@...r.kernel.org, davem@...emloft.net, bwh@...nel.org
Cc:	jesse.brandeburg@...el.com, andi@...stfloor.org,
	f.fainelli@...il.com, alexander.duyck@...il.com,
	jeffrey.t.kirsher@...el.com, shannon.nelson@...el.com,
	carolyn.wyborny@...el.com, donald.c.skidmore@...el.com,
	mitch.a.williams@...el.com, ogerlitz@...lanox.com,
	edumazet@...gle.com, jiri@...lanox.com, sfeldma@...il.com,
	gospo@...ulusnetworks.com, sasha.levin@...cle.com,
	dsahern@...il.com, tj@...nel.org, cascardo@...hat.com,
	corbet@....net, ben@...adent.org.uk,
	Kan Liang <kan.liang@...el.com>
Subject: [RFC 4/5] i40e/ethtool: support coalesce getting by queue

From: Kan Liang <kan.liang@...el.com>

This patch implements get_per_queue_coalesce for i40e driver.
For i40e driver, only rx and tx usecs has per queue value. So only these
two parameters are read from specific registers. For other interrupt
coalescing parameters, they are shared among queues. The values which
are stored in vsi will be return.

Signed-off-by: Kan Liang <kan.liang@...el.com>
---
 drivers/net/ethernet/intel/i40e/i40e_ethtool.c | 34 ++++++++++++++++++++++++--
 1 file changed, 32 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
index 3f385ff..b41f0be 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
@@ -1843,11 +1843,16 @@ static int i40e_set_phys_id(struct net_device *netdev,
  * 125us (8000 interrupts per second) == ITR(62)
  */
 
-static int i40e_get_coalesce(struct net_device *netdev,
-			     struct ethtool_coalesce *ec)
+static int __i40e_get_coalesce(struct net_device *netdev,
+			       struct ethtool_coalesce *ec,
+			       int queue)
 {
 	struct i40e_netdev_priv *np = netdev_priv(netdev);
 	struct i40e_vsi *vsi = np->vsi;
+	struct i40e_pf *pf = vsi->back;
+	struct i40e_hw *hw = &pf->hw;
+	struct i40e_q_vector *q_vector;
+	u16 vector;
 
 	ec->tx_max_coalesced_frames_irq = vsi->work_limit;
 	ec->rx_max_coalesced_frames_irq = vsi->work_limit;
@@ -1869,9 +1874,33 @@ static int i40e_get_coalesce(struct net_device *netdev,
 	ec->rx_coalesce_usecs_high = vsi->int_rate_limit;
 	ec->tx_coalesce_usecs_high = vsi->int_rate_limit;
 
+	if (queue > 0) {
+		if (queue >= vsi->num_q_vectors) {
+			netif_info(pf, drv, netdev, "Invalid queue number\n");
+			return -EINVAL;
+		}
+
+		q_vector = vsi->q_vectors[queue];
+		vector = vsi->base_vector + queue;
+
+		ec->rx_coalesce_usecs = ITR_REG_TO_USEC(rd32(hw, I40E_PFINT_ITRN(0, vector - 1)));
+		ec->tx_coalesce_usecs = ITR_REG_TO_USEC(rd32(hw, I40E_PFINT_ITRN(1, vector - 1)));
+	}
 	return 0;
 }
 
+static int i40e_get_coalesce(struct net_device *netdev,
+			     struct ethtool_coalesce *ec)
+{
+	return __i40e_get_coalesce(netdev, ec, -1);
+}
+
+static int i40e_get_per_queue_coalesce(struct net_device *netdev, int queue,
+				       struct ethtool_coalesce *ec)
+{
+	return __i40e_get_coalesce(netdev, ec, queue);
+}
+
 static int i40e_set_coalesce(struct net_device *netdev,
 			     struct ethtool_coalesce *ec)
 {
@@ -2788,6 +2817,7 @@ static const struct ethtool_ops i40e_ethtool_ops = {
 	.get_ts_info		= i40e_get_ts_info,
 	.get_priv_flags		= i40e_get_priv_flags,
 	.set_priv_flags		= i40e_set_priv_flags,
+	.get_per_queue_coalesce	= i40e_get_per_queue_coalesce,
 };
 
 void i40e_set_ethtool_ops(struct net_device *netdev)
-- 
1.7.11.7

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