[dpdk-stable] patch 'net/ixgbe: fix flow control mode setting' has been queued to LTS release 18.11.7

[Kevin Traynor]

Hi,

FYI, your patch has been queued to LTS release 18.11.7

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 03/02/20. So please
shout if anyone has objections.

Also note that after the patch there's a diff of the upstream commit vs the
patch applied to the branch. This will indicate if there was any rebasing
needed to apply to the stable branch. If there were code changes for rebasing
(ie: not only metadata diffs), please double check that the rebase was
correctly done.

Queued patches are on a temporary branch at:
https://github.com/kevintraynor/dpdk-stable-queue

This queued commit can be viewed at:
https://github.com/kevintraynor/dpdk-stable-queue/commit/1fa4864cd8691ca86e04a68fbec6536caa8e304e

Thanks.

Kevin.

---
>From 1fa4864cd8691ca86e04a68fbec6536caa8e304e Mon Sep 17 00:00:00 2001
From: Guinan Sun <guinanx.sun at intel.com>
Date: Tue, 18 Feb 2020 03:39:31 +0000
Subject: [PATCH] net/ixgbe: fix flow control mode setting

[ upstream commit a524f550da6e6c7a308ce7c2f4b6c3be60b5cbfa ]

When the port restarts, the flow ctrl register will be reset,
we need to make sure it can be configured the same as previous setting,
otherwise a register read error would occur. This patch fixes this
issue.

Fixes: af75078fece3 ("first public release")

Signed-off-by: Guinan Sun <guinanx.sun at intel.com>
Tested-by: Tomasz Konieczny <tomaszx.konieczny at intel.com>
Reviewed-by: Xiaolong Ye <xiaolong.ye at intel.com>
---
 drivers/net/ixgbe/ixgbe_ethdev.c | 76 +++++++++++++++++++++-----------
 drivers/net/ixgbe/ixgbe_ethdev.h |  1 +
 2 files changed, 51 insertions(+), 26 deletions(-)

diff --git a/drivers/net/ixgbe/ixgbe_ethdev.c b/drivers/net/ixgbe/ixgbe_ethdev.c
index e06cc433c7..2d49ea011b 100644
--- a/drivers/net/ixgbe/ixgbe_ethdev.c
+++ b/drivers/net/ixgbe/ixgbe_ethdev.c
@@ -1155,6 +1155,6 @@ eth_ixgbe_dev_init(struct rte_eth_dev *eth_dev, void *init_params __rte_unused)
 	ixgbe_dcb_init(hw, dcb_config);
 	/* Get Hardware Flow Control setting */
-	hw->fc.requested_mode = ixgbe_fc_full;
-	hw->fc.current_mode = ixgbe_fc_full;
+	hw->fc.requested_mode = ixgbe_fc_none;
+	hw->fc.current_mode = ixgbe_fc_none;
 	hw->fc.pause_time = IXGBE_FC_PAUSE;
 	for (i = 0; i < IXGBE_DCB_MAX_TRAFFIC_CLASS; i++) {
@@ -2574,4 +2574,37 @@ ixgbe_set_vf_rate_limit(struct rte_eth_dev *dev, uint16_t vf,
 }
 
+static int
+ixgbe_flow_ctrl_enable(struct rte_eth_dev *dev, struct ixgbe_hw *hw)
+{
+	struct ixgbe_adapter *adapter = dev->data->dev_private;
+	int err;
+	uint32_t mflcn;
+
+	err = ixgbe_fc_enable(hw);
+
+	/* Not negotiated is not an error case */
+	if (err == IXGBE_SUCCESS || err == IXGBE_ERR_FC_NOT_NEGOTIATED) {
+		/*
+		 *check if we want to forward MAC frames - driver doesn't
+		 *have native capability to do that,
+		 *so we'll write the registers ourselves
+		 */
+
+		mflcn = IXGBE_READ_REG(hw, IXGBE_MFLCN);
+
+		/* set or clear MFLCN.PMCF bit depending on configuration */
+		if (adapter->mac_ctrl_frame_fwd != 0)
+			mflcn |= IXGBE_MFLCN_PMCF;
+		else
+			mflcn &= ~IXGBE_MFLCN_PMCF;
+
+		IXGBE_WRITE_REG(hw, IXGBE_MFLCN, mflcn);
+		IXGBE_WRITE_FLUSH(hw);
+
+		return 0;
+	}
+	return err;
+}
+
 /*
  * Configure device link speed and setup link.
@@ -2710,4 +2743,10 @@ ixgbe_dev_start(struct rte_eth_dev *dev)
 	ixgbe_restore_statistics_mapping(dev);
 
+	err = ixgbe_flow_ctrl_enable(dev, hw);
+	if (err < 0) {
+		PMD_INIT_LOG(ERR, "enable flow ctrl err");
+		goto error;
+	}
+
 	err = ixgbe_dev_rxtx_start(dev);
 	if (err < 0) {
@@ -2926,4 +2965,6 @@ ixgbe_dev_stop(struct rte_eth_dev *dev)
 
 	adapter->rss_reta_updated = 0;
+
+	adapter->mac_ctrl_frame_fwd = 0;
 }
 
@@ -4639,8 +4680,8 @@ ixgbe_flow_ctrl_set(struct rte_eth_dev *dev, struct rte_eth_fc_conf *fc_conf)
 {
 	struct ixgbe_hw *hw;
+	struct ixgbe_adapter *adapter = dev->data->dev_private;
 	int err;
 	uint32_t rx_buf_size;
 	uint32_t max_high_water;
-	uint32_t mflcn;
 	enum ixgbe_fc_mode rte_fcmode_2_ixgbe_fcmode[] = {
 		ixgbe_fc_none,
@@ -4674,29 +4715,12 @@ ixgbe_flow_ctrl_set(struct rte_eth_dev *dev, struct rte_eth_fc_conf *fc_conf)
 	hw->fc.send_xon       = fc_conf->send_xon;
 	hw->fc.disable_fc_autoneg = !fc_conf->autoneg;
+	adapter->mac_ctrl_frame_fwd = fc_conf->mac_ctrl_frame_fwd;
 
-	err = ixgbe_fc_enable(hw);
-
-	/* Not negotiated is not an error case */
-	if ((err == IXGBE_SUCCESS) || (err == IXGBE_ERR_FC_NOT_NEGOTIATED)) {
-
-		/* check if we want to forward MAC frames - driver doesn't have native
-		 * capability to do that, so we'll write the registers ourselves */
-
-		mflcn = IXGBE_READ_REG(hw, IXGBE_MFLCN);
-
-		/* set or clear MFLCN.PMCF bit depending on configuration */
-		if (fc_conf->mac_ctrl_frame_fwd != 0)
-			mflcn |= IXGBE_MFLCN_PMCF;
-		else
-			mflcn &= ~IXGBE_MFLCN_PMCF;
-
-		IXGBE_WRITE_REG(hw, IXGBE_MFLCN, mflcn);
-		IXGBE_WRITE_FLUSH(hw);
-
-		return 0;
+	err = ixgbe_flow_ctrl_enable(dev, hw);
+	if (err < 0) {
+		PMD_INIT_LOG(ERR, "ixgbe_flow_ctrl_enable = 0x%x", err);
+		return -EIO;
 	}
-
-	PMD_INIT_LOG(ERR, "ixgbe_fc_enable = 0x%x", err);
-	return -EIO;
+	return err;
 }
 
diff --git a/drivers/net/ixgbe/ixgbe_ethdev.h b/drivers/net/ixgbe/ixgbe_ethdev.h
index 752d7981e4..2177d37060 100644
--- a/drivers/net/ixgbe/ixgbe_ethdev.h
+++ b/drivers/net/ixgbe/ixgbe_ethdev.h
@@ -506,4 +506,5 @@ struct ixgbe_adapter {
 	 */
 	uint8_t pflink_fullchk;
+	uint8_t mac_ctrl_frame_fwd;
 };
 
-- 
2.21.1

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2020-02-27 17:26:24.085609083 +0000
+++ 0007-net-ixgbe-fix-flow-control-mode-setting.patch	2020-02-27 17:26:23.641831285 +0000
@@ -1 +1 @@
-From a524f550da6e6c7a308ce7c2f4b6c3be60b5cbfa Mon Sep 17 00:00:00 2001
+From 1fa4864cd8691ca86e04a68fbec6536caa8e304e Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit a524f550da6e6c7a308ce7c2f4b6c3be60b5cbfa ]
+
@@ -12 +13,0 @@
-Cc: stable at dpdk.org
@@ -23 +24 @@
-index 0ef84a2861..23b3f5b0cd 100644
+index e06cc433c7..2d49ea011b 100644
@@ -26 +27 @@
-@@ -1177,6 +1177,6 @@ eth_ixgbe_dev_init(struct rte_eth_dev *eth_dev, void *init_params __rte_unused)
+@@ -1155,6 +1155,6 @@ eth_ixgbe_dev_init(struct rte_eth_dev *eth_dev, void *init_params __rte_unused)
@@ -35 +36 @@
-@@ -2539,4 +2539,37 @@ ixgbe_set_vf_rate_limit(struct rte_eth_dev *dev, uint16_t vf,
+@@ -2574,4 +2574,37 @@ ixgbe_set_vf_rate_limit(struct rte_eth_dev *dev, uint16_t vf,
@@ -73 +74 @@
-@@ -2665,4 +2698,10 @@ ixgbe_dev_start(struct rte_eth_dev *dev)
+@@ -2710,4 +2743,10 @@ ixgbe_dev_start(struct rte_eth_dev *dev)
@@ -84,2 +85 @@
-@@ -2901,4 +2940,6 @@ ixgbe_dev_stop(struct rte_eth_dev *dev)
- 	adapter->rss_reta_updated = 0;
+@@ -2926,4 +2965,6 @@ ixgbe_dev_stop(struct rte_eth_dev *dev)
@@ -87 +87 @@
-+	adapter->mac_ctrl_frame_fwd = 0;
+ 	adapter->rss_reta_updated = 0;
@@ -89 +89 @@
- 	hw->adapter_stopped = true;
++	adapter->mac_ctrl_frame_fwd = 0;
@@ -91 +91,2 @@
-@@ -4719,8 +4760,8 @@ ixgbe_flow_ctrl_set(struct rte_eth_dev *dev, struct rte_eth_fc_conf *fc_conf)
+ 
+@@ -4639,8 +4680,8 @@ ixgbe_flow_ctrl_set(struct rte_eth_dev *dev, struct rte_eth_fc_conf *fc_conf)
@@ -101 +102 @@
-@@ -4755,29 +4796,12 @@ ixgbe_flow_ctrl_set(struct rte_eth_dev *dev, struct rte_eth_fc_conf *fc_conf)
+@@ -4674,29 +4715,12 @@ ixgbe_flow_ctrl_set(struct rte_eth_dev *dev, struct rte_eth_fc_conf *fc_conf)
@@ -138 +139 @@
-index 5089347a7e..b8df756575 100644
+index 752d7981e4..2177d37060 100644
@@ -141 +142 @@
-@@ -512,4 +512,5 @@ struct ixgbe_adapter {
+@@ -506,4 +506,5 @@ struct ixgbe_adapter {
@@ -145,2 +146,2 @@
- 	rte_atomic32_t link_thread_running;
- 	pthread_t link_thread_tid;
+ };
+