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From: beilei.xing@intel.com
To: dev@dpdk.org
Cc: jia.guo@intel.com, Beilei Xing <beilei.xing@intel.com>, stable@dpdk.org
Subject: [dpdk-stable] [PATCH] net/i40e: fix conflict with multi-driver
Date: Thu, 19 Nov 2020 14:16:16 +0800
Message-ID: <20201119061616.37482-1-beilei.xing@intel.com> (raw)

From: Beilei Xing <beilei.xing@intel.com>

PMD configures the global register I40E_GLINT_CTL during
device initialization to work around the Rx write back
issue. But when a device is bound from DPDK to kernel,
the global register is not recovered to the original
state, it will cause kernel driver performance drop issue.
This patch fixes this issue.

Fixes: be6c228d4da3 ("i40e: support Rx interrupt")
Cc: stable@dpdk.org

Signed-off-by: Beilei Xing <beilei.xing@intel.com>
---
 drivers/net/i40e/i40e_ethdev.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
index f54769c29d..2cb18ecc03 100644
--- a/drivers/net/i40e/i40e_ethdev.c
+++ b/drivers/net/i40e/i40e_ethdev.c
@@ -763,6 +763,21 @@ static inline void i40e_config_automask(struct i40e_pf *pf)
 	I40E_WRITE_REG(hw, I40E_GLINT_CTL, val);
 }
 
+static inline void i40e_clear_automask(struct i40e_pf *pf)
+{
+	struct i40e_hw *hw = I40E_PF_TO_HW(pf);
+	uint32_t val;
+
+	val = I40E_READ_REG(hw, I40E_GLINT_CTL);
+	val &= ~(I40E_GLINT_CTL_DIS_AUTOMASK_PF0_MASK |
+		 I40E_GLINT_CTL_DIS_AUTOMASK_VF0_MASK);
+
+	if (!pf->support_multi_driver)
+		val &= ~I40E_GLINT_CTL_DIS_AUTOMASK_N_MASK;
+
+	I40E_WRITE_REG(hw, I40E_GLINT_CTL, val);
+}
+
 #define I40E_FLOW_CONTROL_ETHERTYPE  0x8808
 
 /*
@@ -2741,6 +2756,8 @@ i40e_dev_close(struct rte_eth_dev *dev)
 	/* Remove all Traffic Manager configuration */
 	i40e_tm_conf_uninit(dev);
 
+	i40e_clear_automask(pf);
+
 	hw->adapter_closed = 1;
 	return ret;
 }
-- 
2.26.2


             reply	other threads:[~2020-11-18  6:23 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-19  6:16 beilei.xing [this message]
2020-11-19  6:24 ` Guo, Jia
2020-11-20  8:49 ` [dpdk-stable] [PATCH v2] net/i40e: fix global register recovery beilei.xing
2020-11-24  5:56   ` Guo, Jia
2020-12-11  2:23     ` Zhang, Qi Z
  -- strict thread matches above, loose matches on Subject: below --
2019-09-20 10:57 [dpdk-stable] [PATCH] net/i40e: fix conflict with multi-driver alvinx.zhang
2019-09-25  9:16 ` Xing, Beilei

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