netdev - [PATCH rdma-next 9/9] RDMA/bnxt_re: Add support for changing the snap dump level

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Message-Id: <1740076496-14227-10-git-send-email-selvin.xavier@broadcom.com>
Date: Thu, 20 Feb 2025 10:34:56 -0800
From: Selvin Xavier <selvin.xavier@...adcom.com>
To: leon@...nel.org,
	jgg@...pe.ca
Cc: linux-rdma@...r.kernel.org,
	andrew.gospodarek@...adcom.com,
	kalesh-anakkur.purayil@...adcom.com,
	netdev@...r.kernel.org,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	abeni@...hat.com,
	horms@...nel.org,
	michael.chan@...adcom.com,
	Selvin Xavier <selvin.xavier@...adcom.com>
Subject: [PATCH rdma-next 9/9] RDMA/bnxt_re: Add support for changing the snap dump level

Add support for changing the default debug dump level.

Reviewed-by: Saravanan Vajravel <saravanan.vajravel@...adcom.com>
Signed-off-by: Selvin Xavier <selvin.xavier@...adcom.com>
---
 drivers/infiniband/hw/bnxt_re/bnxt_re.h |  2 ++
 drivers/infiniband/hw/bnxt_re/debugfs.c | 49 +++++++++++++++++++++++++++++++++
 2 files changed, 51 insertions(+)

diff --git a/drivers/infiniband/hw/bnxt_re/bnxt_re.h b/drivers/infiniband/hw/bnxt_re/bnxt_re.h
index 45601635..45d62f6 100644
--- a/drivers/infiniband/hw/bnxt_re/bnxt_re.h
+++ b/drivers/infiniband/hw/bnxt_re/bnxt_re.h
@@ -304,6 +304,8 @@ struct bnxt_re_dev {
 	struct workqueue_struct		*dcb_wq;
 	/* Head to track all QP dump */
 	struct bnxt_re_qdump_head qdump_head;
+	struct dentry                   *tunables;
+	struct dentry                   *snapdump_dbg;
 	u8 snapdump_dbg_lvl;
 	struct dentry                   *cc_config;
 	struct bnxt_re_dbg_cc_config_params *cc_config_params;
diff --git a/drivers/infiniband/hw/bnxt_re/debugfs.c b/drivers/infiniband/hw/bnxt_re/debugfs.c
index af91d16..e3fba53 100644
--- a/drivers/infiniband/hw/bnxt_re/debugfs.c
+++ b/drivers/infiniband/hw/bnxt_re/debugfs.c
@@ -306,6 +306,52 @@ static const struct file_operations bnxt_re_cc_config_ops = {
 	.write = bnxt_re_cc_config_set,
 };
 
+static ssize_t bnxt_re_snapdump_dbg_lvl_set(struct file *filp, const char __user *buffer,
+					    size_t count, loff_t *ppos)
+{
+	struct bnxt_re_dev *rdev = filp->private_data;
+	char buf[16];
+	u32 val;
+
+	if (count >= sizeof(buf))
+		return -EINVAL;
+
+	if (copy_from_user(buf, buffer, count))
+		return -EFAULT;
+
+	buf[count] = '\0';
+	if (kstrtou32(buf, 0, &val))
+		return -EINVAL;
+
+	if (val > BNXT_RE_SNAPDUMP_ALL)
+		return -EINVAL;
+
+	rdev->snapdump_dbg_lvl = val;
+
+	return count;
+}
+
+static ssize_t bnxt_re_snapdump_dbg_lvl_get(struct file *filp, char __user *buffer,
+					    size_t usr_buf_len, loff_t *ppos)
+{
+	struct bnxt_re_dev *rdev = filp->private_data;
+	char buf[16];
+	int rc;
+
+	rc = snprintf(buf, sizeof(buf), "%d\n", rdev->snapdump_dbg_lvl);
+	if (rc < 0)
+		return rc;
+
+	return simple_read_from_buffer(buffer, usr_buf_len, ppos, (u8 *)(buf), rc);
+}
+
+static const struct file_operations bnxt_re_snapdump_dbg_lvl = {
+	.owner = THIS_MODULE,
+	.open = simple_open,
+	.read = bnxt_re_snapdump_dbg_lvl_get,
+	.write = bnxt_re_snapdump_dbg_lvl_set,
+};
+
 void bnxt_re_debugfs_add_pdev(struct bnxt_re_dev *rdev)
 {
 	struct pci_dev *pdev = rdev->en_dev->pdev;
@@ -329,6 +375,9 @@ void bnxt_re_debugfs_add_pdev(struct bnxt_re_dev *rdev)
 							 rdev->cc_config, tmp_params,
 							 &bnxt_re_cc_config_ops);
 	}
+	rdev->tunables = debugfs_create_dir("tunables", rdev->dbg_root);
+	rdev->snapdump_dbg = debugfs_create_file("snapdump_dbg_lvl", 0400,  rdev->tunables, rdev,
+						 &bnxt_re_snapdump_dbg_lvl);
 }
 
 void bnxt_re_debugfs_rem_pdev(struct bnxt_re_dev *rdev)
-- 
2.5.5