[dpdk-stable] patch 'net/hns3: fix data overwriting during register dump' has been queued to stable release 20.11.1

[luca.boccassi@gmail.com]

Hi,

FYI, your patch has been queued to stable release 20.11.1

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 02/07/21. 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/bluca/dpdk-stable

This queued commit can be viewed at:
https://github.com/bluca/dpdk-stable/commit/febf166092ad6a786641951356f3b594a4a39716

Thanks.

Luca Boccassi

---
From febf166092ad6a786641951356f3b594a4a39716 Mon Sep 17 00:00:00 2001
From: Chengchang Tang <tangchengchang@huawei.com>
Date: Thu, 14 Jan 2021 21:33:35 +0800
Subject: [PATCH] net/hns3: fix data overwriting during register dump

[ upstream commit 6da903befad6a7da52ee6b80554f63bf74bb9ad1 ]

The data pointer has not moved after BAR register dumped. This causes
the later register to overwrite the previous data.

This patch fix the overwriting by move the pointer after every dump
function. And the missing separator between 32-bit register and the
64-bit register is also added to avoid a parsing error.

Fixes: 936eda25e8da ("net/hns3: support dump register")

Signed-off-by: Chengchang Tang <tangchengchang@huawei.com>
Signed-off-by: Lijun Ou <oulijun@huawei.com>
---
 drivers/net/hns3/hns3_regs.c | 70 ++++++++++++++++++++----------------
 1 file changed, 40 insertions(+), 30 deletions(-)

diff --git a/drivers/net/hns3/hns3_regs.c b/drivers/net/hns3/hns3_regs.c
index 32597fe21c..775e0965f7 100644
--- a/drivers/net/hns3/hns3_regs.c
+++ b/drivers/net/hns3/hns3_regs.c
@@ -252,63 +252,68 @@ hns3_get_64_bit_regs(struct hns3_hw *hw, uint32_t regs_num, void *data)
 	return 0;
 }
 
-static void
+static int
+hns3_insert_reg_separator(int reg_num, uint32_t *data)
+{
+	int separator_num;
+	int i;
+
+	separator_num = MAX_SEPARATE_NUM - reg_num % REG_NUM_PER_LINE;
+	for (i = 0; i < separator_num; i++)
+		*data++ = SEPARATOR_VALUE;
+	return separator_num;
+}
+
+static int
 hns3_direct_access_regs(struct hns3_hw *hw, uint32_t *data)
 {
 	struct hns3_adapter *hns = HNS3_DEV_HW_TO_ADAPTER(hw);
+	uint32_t *origin_data_ptr = data;
 	uint32_t reg_offset;
-	int separator_num;
-	int reg_um;
+	int reg_num;
 	int i, j;
 
 	/* fetching per-PF registers values from PF PCIe register space */
-	reg_um = sizeof(cmdq_reg_addrs) / sizeof(uint32_t);
-	separator_num = MAX_SEPARATE_NUM - reg_um % REG_NUM_PER_LINE;
-	for (i = 0; i < reg_um; i++)
+	reg_num = sizeof(cmdq_reg_addrs) / sizeof(uint32_t);
+	for (i = 0; i < reg_num; i++)
 		*data++ = hns3_read_dev(hw, cmdq_reg_addrs[i]);
-	for (i = 0; i < separator_num; i++)
-		*data++ = SEPARATOR_VALUE;
+	data += hns3_insert_reg_separator(reg_num, data);
 
 	if (hns->is_vf)
-		reg_um = sizeof(common_vf_reg_addrs) / sizeof(uint32_t);
+		reg_num = sizeof(common_vf_reg_addrs) / sizeof(uint32_t);
 	else
-		reg_um = sizeof(common_reg_addrs) / sizeof(uint32_t);
-	separator_num = MAX_SEPARATE_NUM - reg_um % REG_NUM_PER_LINE;
-	for (i = 0; i < reg_um; i++)
+		reg_num = sizeof(common_reg_addrs) / sizeof(uint32_t);
+	for (i = 0; i < reg_num; i++)
 		if (hns->is_vf)
 			*data++ = hns3_read_dev(hw, common_vf_reg_addrs[i]);
 		else
 			*data++ = hns3_read_dev(hw, common_reg_addrs[i]);
-	for (i = 0; i < separator_num; i++)
-		*data++ = SEPARATOR_VALUE;
+	data += hns3_insert_reg_separator(reg_num, data);
 
-	reg_um = sizeof(ring_reg_addrs) / sizeof(uint32_t);
-	separator_num = MAX_SEPARATE_NUM - reg_um % REG_NUM_PER_LINE;
+	reg_num = sizeof(ring_reg_addrs) / sizeof(uint32_t);
 	for (j = 0; j < hw->tqps_num; j++) {
 		reg_offset = hns3_get_tqp_reg_offset(j);
-		for (i = 0; i < reg_um; i++)
+		for (i = 0; i < reg_num; i++)
 			*data++ = hns3_read_dev(hw,
 						ring_reg_addrs[i] + reg_offset);
-		for (i = 0; i < separator_num; i++)
-			*data++ = SEPARATOR_VALUE;
+		data += hns3_insert_reg_separator(reg_num, data);
 	}
 
-	reg_um = sizeof(tqp_intr_reg_addrs) / sizeof(uint32_t);
-	separator_num = MAX_SEPARATE_NUM - reg_um % REG_NUM_PER_LINE;
+	reg_num = sizeof(tqp_intr_reg_addrs) / sizeof(uint32_t);
 	for (j = 0; j < hw->num_msi; j++) {
 		reg_offset = HNS3_TQP_INTR_REG_SIZE * j;
-		for (i = 0; i < reg_um; i++)
-			*data++ = hns3_read_dev(hw,
-						tqp_intr_reg_addrs[i] +
+		for (i = 0; i < reg_num; i++)
+			*data++ = hns3_read_dev(hw, tqp_intr_reg_addrs[i] +
 						reg_offset);
-		for (i = 0; i < separator_num; i++)
-			*data++ = SEPARATOR_VALUE;
+		data += hns3_insert_reg_separator(reg_num, data);
 	}
+	return data - origin_data_ptr;
 }
 
 int
 hns3_get_regs(struct rte_eth_dev *eth_dev, struct rte_dev_reg_info *regs)
 {
+#define HNS3_64_BIT_REG_SIZE (sizeof(uint64_t) / sizeof(uint32_t))
 	struct hns3_adapter *hns = eth_dev->data->dev_private;
 	struct hns3_hw *hw = &hns->hw;
 	uint32_t regs_num_32_bit;
@@ -338,7 +343,7 @@ hns3_get_regs(struct rte_eth_dev *eth_dev, struct rte_dev_reg_info *regs)
 		return -ENOTSUP;
 
 	/* fetching per-PF registers values from PF PCIe register space */
-	hns3_direct_access_regs(hw, data);
+	data += hns3_direct_access_regs(hw, data);
 
 	if (hns->is_vf)
 		return 0;
@@ -355,11 +360,16 @@ hns3_get_regs(struct rte_eth_dev *eth_dev, struct rte_dev_reg_info *regs)
 		hns3_err(hw, "Get 32 bit register failed, ret = %d", ret);
 		return ret;
 	}
-
 	data += regs_num_32_bit;
+	data += hns3_insert_reg_separator(regs_num_32_bit, data);
+
 	ret = hns3_get_64_bit_regs(hw, regs_num_64_bit, data);
-	if (ret)
+	if (ret) {
 		hns3_err(hw, "Get 64 bit register failed, ret = %d", ret);
-
+		return ret;
+	}
+	data += regs_num_64_bit * HNS3_64_BIT_REG_SIZE;
+	data += hns3_insert_reg_separator(regs_num_64_bit *
+					  HNS3_64_BIT_REG_SIZE, data);
 	return ret;
 }
-- 
2.29.2

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2021-02-05 11:18:36.951437534 +0000
+++ 0172-net-hns3-fix-data-overwriting-during-register-dump.patch	2021-02-05 11:18:29.130697280 +0000
@@ -1 +1 @@
-From 6da903befad6a7da52ee6b80554f63bf74bb9ad1 Mon Sep 17 00:00:00 2001
+From febf166092ad6a786641951356f3b594a4a39716 Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit 6da903befad6a7da52ee6b80554f63bf74bb9ad1 ]
+
@@ -14 +15,0 @@
-Cc: stable@dpdk.org