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Date:   Mon, 31 Dec 2018 16:32:06 +0200
From:   Eran Ben Elisha <eranbe@...lanox.com>
To:     netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        Jiri Pirko <jiri@...lanox.com>
Cc:     Moshe Shemesh <moshe@...lanox.com>, Aya Levin <ayal@...lanox.com>,
        Eran Ben Elisha <eranbe@...lanox.com>,
        Tal Alon <talal@...lanox.com>,
        Ariel Almog <ariela@...lanox.com>
Subject: [PATCH RFC net-next 12/19] net/mlx5: Refactor print health info

From: Moshe Shemesh <moshe@...lanox.com>

Refactor print health info code, split to two functions:
 1. mlx5_get_health_info() - writes the health info into a buffer.
 2. mlx5_print_health_info() - prints the health info to kernel log.
This refactoring is done to enable using the health info data by devlink
health reporter diagnose() in the downstream patch.

Signed-off-by: Moshe Shemesh <moshe@...lanox.com>
---
 .../net/ethernet/mellanox/mlx5/core/health.c  | 44 +++++++++++++------
 .../ethernet/mellanox/mlx5/core/mlx5_core.h   |  7 +++
 include/linux/mlx5/device.h                   |  1 +
 include/linux/mlx5/mlx5_ifc.h                 |  4 +-
 4 files changed, 42 insertions(+), 14 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/health.c b/drivers/net/ethernet/mellanox/mlx5/core/health.c
index 196c07383082..2fa78edde1fe 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/health.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/health.c
@@ -215,7 +215,8 @@ static const char *hsynd_str(u8 synd)
 	}
 }
 
-static void print_health_info(struct mlx5_core_dev *dev)
+void mlx5_get_health_info(struct mlx5_core_dev *dev, u8 *synd,
+			  char (*lines_buf)[HEALTH_INFO_MAX_LINE])
 {
 	struct mlx5_core_health *health = &dev->priv.health;
 	struct health_buffer __iomem *h = health->health;
@@ -223,23 +224,40 @@ static void print_health_info(struct mlx5_core_dev *dev)
 	u32 fw;
 	int i;
 
+	*synd = ioread8(&h->synd);
 	/* If the syndrome is 0, the device is OK and no need to print buffer */
-	if (!ioread8(&h->synd))
+	if (!synd)
 		return;
 
 	for (i = 0; i < ARRAY_SIZE(h->assert_var); i++)
-		dev_err(&dev->pdev->dev, "assert_var[%d] 0x%08x\n", i, ioread32be(h->assert_var + i));
+		sprintf(lines_buf[i], "assert_var[%d] 0x%08x\n", i, ioread32be(h->assert_var + i));
 
-	dev_err(&dev->pdev->dev, "assert_exit_ptr 0x%08x\n", ioread32be(&h->assert_exit_ptr));
-	dev_err(&dev->pdev->dev, "assert_callra 0x%08x\n", ioread32be(&h->assert_callra));
+	sprintf(lines_buf[i++], "assert_exit_ptr 0x%08x\n", ioread32be(&h->assert_exit_ptr));
+	sprintf(lines_buf[i++], "assert_callra 0x%08x\n", ioread32be(&h->assert_callra));
 	sprintf(fw_str, "%d.%d.%d", fw_rev_maj(dev), fw_rev_min(dev), fw_rev_sub(dev));
-	dev_err(&dev->pdev->dev, "fw_ver %s\n", fw_str);
-	dev_err(&dev->pdev->dev, "hw_id 0x%08x\n", ioread32be(&h->hw_id));
-	dev_err(&dev->pdev->dev, "irisc_index %d\n", ioread8(&h->irisc_index));
-	dev_err(&dev->pdev->dev, "synd 0x%x: %s\n", ioread8(&h->synd), hsynd_str(ioread8(&h->synd)));
-	dev_err(&dev->pdev->dev, "ext_synd 0x%04x\n", ioread16be(&h->ext_synd));
+	sprintf(lines_buf[i++], "fw_ver %s\n", fw_str);
+	sprintf(lines_buf[i++], "hw_id 0x%08x\n", ioread32be(&h->hw_id));
+	sprintf(lines_buf[i++], "irisc_index %d\n", ioread8(&h->irisc_index));
+	sprintf(lines_buf[i++], "synd 0x%x: %s\n", ioread8(&h->synd), hsynd_str(ioread8(&h->synd)));
+	sprintf(lines_buf[i++], "ext_synd 0x%04x\n", ioread16be(&h->ext_synd));
 	fw = ioread32be(&h->fw_ver);
-	dev_err(&dev->pdev->dev, "raw fw_ver 0x%08x\n", fw);
+	sprintf(lines_buf[i], "raw fw_ver 0x%08x\n", fw);
+}
+
+static void mlx5_print_health_info(struct mlx5_core_dev *dev)
+{
+	char lines_buf[HEALTH_INFO_LINES][HEALTH_INFO_MAX_LINE] = {};
+	u8 synd;
+	int i;
+
+	mlx5_get_health_info(dev, &synd, lines_buf);
+
+	if (!synd)
+		return;
+
+	for (i = 0; i < HEALTH_INFO_LINES; i++)
+		dev_err(&dev->pdev->dev, lines_buf[i]);
+
 }
 
 static unsigned long get_next_poll_jiffies(void)
@@ -285,12 +303,12 @@ static void poll_health(struct timer_list *t)
 	health->prev = count;
 	if (health->miss_counter == MAX_MISSES) {
 		dev_err(&dev->pdev->dev, "device's health compromised - reached miss count\n");
-		print_health_info(dev);
+		mlx5_print_health_info(dev);
 	}
 
 	if (in_fatal(dev) && !health->sick) {
 		health->sick = true;
-		print_health_info(dev);
+		mlx5_print_health_info(dev);
 		mlx5_trigger_health_work(dev);
 	}
 
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h b/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h
index c68dcea5985b..ea53195c89a6 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h
@@ -199,4 +199,11 @@ enum {
 
 u8 mlx5_get_nic_state(struct mlx5_core_dev *dev);
 void mlx5_set_nic_state(struct mlx5_core_dev *dev, u8 state);
+
+#define HEALTH_INFO_MAX_LINE 80
+#define HEALTH_INFO_LINES (MLX5_FLD_SZ_DW(health_buffer, assert_var) + 8)
+#define HEALTH_INFO_MAX_BUFF (HEALTH_INFO_MAX_LINE * HEALTH_INFO_LINES)
+void mlx5_get_health_info(struct mlx5_core_dev *dev, u8 *synd,
+			  char (*lines_buf)[HEALTH_INFO_MAX_LINE]);
+
 #endif /* __MLX5_CORE_H__ */
diff --git a/include/linux/mlx5/device.h b/include/linux/mlx5/device.h
index 8c4a820bd4c1..bb68ab6dffe0 100644
--- a/include/linux/mlx5/device.h
+++ b/include/linux/mlx5/device.h
@@ -61,6 +61,7 @@
 #define __mlx5_st_sz_bits(typ) sizeof(struct mlx5_ifc_##typ##_bits)
 
 #define MLX5_FLD_SZ_BYTES(typ, fld) (__mlx5_bit_sz(typ, fld) / 8)
+#define MLX5_FLD_SZ_DW(typ, fld) (__mlx5_bit_sz(typ, fld) / 32)
 #define MLX5_ST_SZ_BYTES(typ) (sizeof(struct mlx5_ifc_##typ##_bits) / 8)
 #define MLX5_ST_SZ_DW(typ) (sizeof(struct mlx5_ifc_##typ##_bits) / 32)
 #define MLX5_ST_SZ_QW(typ) (sizeof(struct mlx5_ifc_##typ##_bits) / 64)
diff --git a/include/linux/mlx5/mlx5_ifc.h b/include/linux/mlx5/mlx5_ifc.h
index 821b751485fb..505a5f6cecdf 100644
--- a/include/linux/mlx5/mlx5_ifc.h
+++ b/include/linux/mlx5/mlx5_ifc.h
@@ -3360,7 +3360,9 @@ union mlx5_ifc_event_auto_bits {
 };
 
 struct mlx5_ifc_health_buffer_bits {
-	u8         reserved_at_0[0x100];
+	u8         assert_var[0xa0];
+
+	u8         reserved_at_a0[0x60];
 
 	u8         assert_existptr[0x20];
 
-- 
2.17.1

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