[dpdk-stable] patch 'net/i40e: workaround performance degradation' has been queued to LTS release 16.11.8

[luca.boccassi at gmail.com]

Hi,

FYI, your patch has been queued to LTS release 16.11.8

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 07/26/18. So please
shout if anyone has objections.

Thanks.

Luca Boccassi

---
>From 2d5a7c1f330815a74a86cf64257631e1b2b3be53 Mon Sep 17 00:00:00 2001
From: Haiyue Wang <haiyue.wang at intel.com>
Date: Wed, 13 Jun 2018 13:52:41 +0800
Subject: [PATCH] net/i40e: workaround performance degradation

[ upstream commit 3320d4a240daab15559d3e671bd44573a89cf017 ]

The GL_SWR_PM_UP_THR value is not impacted from the link speed, its
value is set according to the total number of ports for a better
pipe-monitor configuration.

All bellowing relevant device IDs are considered (NICs, LOMs, Mezz
and Backplane):

Device-ID  Value        Comments
0x1572     0x03030303   10G SFI
0x1581     0x03030303   10G Backplane
0x1586     0x03030303   10G BaseT
0x1589     0x03030303   10G BaseT (FortPond)
0x1580     0x06060606   40G Backplane
0x1583     0x06060606   2x40G QSFP
0x1584     0x06060606   1x40G QSFP
0x1587     0x06060606   20G Backplane (HP)
0x1588     0x06060606   20G KR2 (HP)
0x158A     0x06060606   25G Backplane
0x158B     0x06060606   25G SFP28

Fixes: c9223a2bf53c ("i40e: workaround for XL710 performance")
Fixes: 75d133dd3296 ("net/i40e: enable 25G device")

Signed-off-by: Haiyue Wang <haiyue.wang at intel.com>
Acked-by: Qi Zhang <qi.z.zhang at intel.com>
---
 drivers/net/i40e/i40e_ethdev.c | 71 ++++++++++++++++++++++++++++++----
 1 file changed, 64 insertions(+), 7 deletions(-)

diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
index d9fff5c4d..2eeb472d0 100644
--- a/drivers/net/i40e/i40e_ethdev.c
+++ b/drivers/net/i40e/i40e_ethdev.c
@@ -8669,6 +8669,60 @@ i40e_pctype_to_flowtype(enum i40e_filter_pctype pctype)
 #define I40E_GL_SWR_PM_UP_THR_SF_VALUE   0x06060606
 #define I40E_GL_SWR_PM_UP_THR            0x269FBC
 
+/*
+ * GL_SWR_PM_UP_THR:
+ * The value is not impacted from the link speed, its value is set according
+ * to the total number of ports for a better pipe-monitor configuration.
+ */
+static bool
+i40e_get_swr_pm_cfg(struct i40e_hw *hw, uint32_t *value)
+{
+#define I40E_GL_SWR_PM_EF_DEVICE(dev) \
+		.device_id = (dev),   \
+		.val = I40E_GL_SWR_PM_UP_THR_EF_VALUE
+
+#define I40E_GL_SWR_PM_SF_DEVICE(dev) \
+		.device_id = (dev),   \
+		.val = I40E_GL_SWR_PM_UP_THR_SF_VALUE
+
+	static const struct {
+		uint16_t device_id;
+		uint32_t val;
+	} swr_pm_table[] = {
+		{ I40E_GL_SWR_PM_EF_DEVICE(I40E_DEV_ID_SFP_XL710) },
+		{ I40E_GL_SWR_PM_EF_DEVICE(I40E_DEV_ID_KX_C) },
+		{ I40E_GL_SWR_PM_EF_DEVICE(I40E_DEV_ID_10G_BASE_T) },
+		{ I40E_GL_SWR_PM_EF_DEVICE(I40E_DEV_ID_10G_BASE_T4) },
+
+		{ I40E_GL_SWR_PM_SF_DEVICE(I40E_DEV_ID_KX_B) },
+		{ I40E_GL_SWR_PM_SF_DEVICE(I40E_DEV_ID_QSFP_A) },
+		{ I40E_GL_SWR_PM_SF_DEVICE(I40E_DEV_ID_QSFP_B) },
+		{ I40E_GL_SWR_PM_SF_DEVICE(I40E_DEV_ID_20G_KR2) },
+		{ I40E_GL_SWR_PM_SF_DEVICE(I40E_DEV_ID_20G_KR2_A) },
+		{ I40E_GL_SWR_PM_SF_DEVICE(I40E_DEV_ID_25G_B) },
+		{ I40E_GL_SWR_PM_SF_DEVICE(I40E_DEV_ID_25G_SFP28) },
+	};
+	uint32_t i;
+
+	if (value == NULL) {
+		PMD_DRV_LOG(ERR, "value is NULL");
+		return false;
+	}
+
+	for (i = 0; i < RTE_DIM(swr_pm_table); i++) {
+		if (hw->device_id == swr_pm_table[i].device_id) {
+			*value = swr_pm_table[i].val;
+
+			PMD_DRV_LOG(DEBUG, "Device 0x%x with GL_SWR_PM_UP_THR "
+				    "value - 0x%08x",
+				    hw->device_id, *value);
+			return true;
+		}
+	}
+
+	return false;
+}
+
 static int
 i40e_dev_sync_phy_type(struct i40e_hw *hw)
 {
@@ -8724,13 +8778,16 @@ i40e_configure_registers(struct i40e_hw *hw)
 		}
 
 		if (reg_table[i].addr == I40E_GL_SWR_PM_UP_THR) {
-			if (I40E_PHY_TYPE_SUPPORT_40G(hw->phy.phy_types) || /* For XL710 */
-			    I40E_PHY_TYPE_SUPPORT_25G(hw->phy.phy_types)) /* For XXV710 */
-				reg_table[i].val =
-					I40E_GL_SWR_PM_UP_THR_SF_VALUE;
-			else /* For X710 */
-				reg_table[i].val =
-					I40E_GL_SWR_PM_UP_THR_EF_VALUE;
+			uint32_t cfg_val;
+
+			if (!i40e_get_swr_pm_cfg(hw, &cfg_val)) {
+				PMD_DRV_LOG(DEBUG, "Device 0x%x skips "
+					    "GL_SWR_PM_UP_THR value fixup",
+					    hw->device_id);
+				continue;
+			}
+
+			reg_table[i].val = cfg_val;
 		}
 
 		ret = i40e_aq_debug_read_register(hw, reg_table[i].addr,
-- 
2.18.0