netdev - [PATCH net-next 10/19] bnxt_en: Refactor coredump functions

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Date:   Sat, 23 Oct 2021 15:31:57 -0400
From:   Michael Chan <michael.chan@...adcom.com>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, kuba@...nel.org, edwin.peer@...adcom.com,
        gospo@...adcom.com, jiri@...dia.com
Subject: [PATCH net-next 10/19] bnxt_en: Refactor coredump functions

From: Edwin Peer <edwin.peer@...adcom.com>

The coredump functionality will be used by devlink health. Refactor
these functions that get coredump and coredump length. There is no
functional change, but the following checkpatch warnings were
addressed:

  - strscpy is preferred over strlcpy.
  - sscanf results should be checked, with an additional warning.

Signed-off-by: Edwin Peer <edwin.peer@...adcom.com>
Signed-off-by: Michael Chan <michael.chan@...adcom.com>
---
 .../net/ethernet/broadcom/bnxt/bnxt_ethtool.c | 48 ++++++++++++-------
 1 file changed, 31 insertions(+), 17 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
index 15c518024965..fe832f97f905 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
@@ -3808,7 +3808,7 @@ bnxt_fill_coredump_record(struct bnxt *bp, struct bnxt_coredump_record *record,
 	record->low_version = 0;
 	record->high_version = 1;
 	record->asic_state = 0;
-	strlcpy(record->system_name, utsname()->nodename,
+	strscpy(record->system_name, utsname()->nodename,
 		sizeof(record->system_name));
 	record->year = cpu_to_le16(tm.tm_year + 1900);
 	record->month = cpu_to_le16(tm.tm_mon + 1);
@@ -3820,11 +3820,12 @@ bnxt_fill_coredump_record(struct bnxt *bp, struct bnxt_coredump_record *record,
 	strcpy(record->commandline, "ethtool -w");
 	record->total_segments = cpu_to_le32(total_segs);
 
-	sscanf(utsname()->release, "%u.%u", &os_ver_major, &os_ver_minor);
+	if (sscanf(utsname()->release, "%u.%u", &os_ver_major, &os_ver_minor) != 2)
+		netdev_warn(bp->dev, "Unknown OS release in coredump\n");
 	record->os_ver_major = cpu_to_le32(os_ver_major);
 	record->os_ver_minor = cpu_to_le32(os_ver_minor);
 
-	strlcpy(record->os_name, utsname()->sysname, 32);
+	strscpy(record->os_name, utsname()->sysname, sizeof(record->os_name));
 	time64_to_tm(end, 0, &tm);
 	record->end_year = cpu_to_le16(tm.tm_year + 1900);
 	record->end_month = cpu_to_le16(tm.tm_mon + 1);
@@ -3842,7 +3843,7 @@ bnxt_fill_coredump_record(struct bnxt *bp, struct bnxt_coredump_record *record,
 	record->ioctl_high_version = 0;
 }
 
-static int bnxt_get_coredump(struct bnxt *bp, void *buf, u32 *dump_len)
+static int __bnxt_get_coredump(struct bnxt *bp, void *buf, u32 *dump_len)
 {
 	u32 ver_get_resp_len = sizeof(struct hwrm_ver_get_output);
 	u32 offset = 0, seg_hdr_len, seg_record_len, buf_len = 0;
@@ -3945,6 +3946,30 @@ static int bnxt_get_coredump(struct bnxt *bp, void *buf, u32 *dump_len)
 	return rc;
 }
 
+static int bnxt_get_coredump(struct bnxt *bp, u16 dump_type, void *buf, u32 *dump_len)
+{
+	if (dump_type == BNXT_DUMP_CRASH) {
+#ifdef CONFIG_TEE_BNXT_FW
+		return tee_bnxt_copy_coredump(buf, 0, *dump_len);
+#else
+		return -EOPNOTSUPP;
+#endif
+	} else {
+		return __bnxt_get_coredump(bp, buf, dump_len);
+	}
+}
+
+static u32 bnxt_get_coredump_length(struct bnxt *bp, u16 dump_type)
+{
+	u32 len = 0;
+
+	if (dump_type == BNXT_DUMP_CRASH)
+		len = BNXT_CRASH_DUMP_LEN;
+	else
+		__bnxt_get_coredump(bp, NULL, &len);
+	return len;
+}
+
 static int bnxt_set_dump(struct net_device *dev, struct ethtool_dump *dump)
 {
 	struct bnxt *bp = netdev_priv(dev);
@@ -3976,10 +4001,7 @@ static int bnxt_get_dump_flag(struct net_device *dev, struct ethtool_dump *dump)
 			bp->ver_resp.hwrm_fw_rsvd_8b;
 
 	dump->flag = bp->dump_flag;
-	if (bp->dump_flag == BNXT_DUMP_CRASH)
-		dump->len = BNXT_CRASH_DUMP_LEN;
-	else
-		bnxt_get_coredump(bp, NULL, &dump->len);
+	dump->len = bnxt_get_coredump_length(bp, bp->dump_flag);
 	return 0;
 }
 
@@ -3994,15 +4016,7 @@ static int bnxt_get_dump_data(struct net_device *dev, struct ethtool_dump *dump,
 	memset(buf, 0, dump->len);
 
 	dump->flag = bp->dump_flag;
-	if (dump->flag == BNXT_DUMP_CRASH) {
-#ifdef CONFIG_TEE_BNXT_FW
-		return tee_bnxt_copy_coredump(buf, 0, dump->len);
-#endif
-	} else {
-		return bnxt_get_coredump(bp, buf, &dump->len);
-	}
-
-	return 0;
+	return bnxt_get_coredump(bp, dump->flag, buf, &dump->len);
 }
 
 static int bnxt_get_ts_info(struct net_device *dev,
-- 
2.18.1


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