[PATCH net-next v2 2/4] bnxt_en: Report the ethtool coredump length after copying the coredump

[Michael Chan <michael.chan@broadcom.com>]

From: Shruti Parab <shruti.parab@broadcom.com>

ethtool first calls .get_dump_flags() to get the dump length.  For
coredump, the driver calls the FW to get the coredump length (L1).  The
min. of L1 and the user specified length is then passed to
.get_dump_data() (L2) to get the coredump.  The actual coredump length
retrieved by the FW (L3) during .get_dump_data() may be smaller than L1.
This length discrepancy will trigger a WARN_ON() in
ethtool_get_dump_data().

ethtool has already vzalloc'ed a buffer with size L1.  Just report
the coredump length as L2 even though the actual coredump length L3
may be smaller.  The extra zero padding does not matter.  This will
prevent the warning that may alarm the user.

For correctness, only do the final length update if there is no error.

Reviewed-by: Andy Gospodarek <andrew.gospodarek@broadcom.com>
Reviewed-by: Damodharam Ammepalli <damodharam.ammepalli@broadcom.com>
Signed-off-by: Shruti Parab <shruti.parab@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt_coredump.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_coredump.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_coredump.c
index 5576e7cf8463..9b6489e417fc 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_coredump.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_coredump.c
@@ -496,9 +496,16 @@ static int __bnxt_get_coredump(struct bnxt *bp, u16 dump_type, void *buf,
 					  start_utc, coredump.total_segs + 1,
 					  rc);
 	kfree(coredump.data);
-	*dump_len += sizeof(struct bnxt_coredump_record);
-	if (rc == -ENOBUFS)
+	if (!rc) {
+		*dump_len += sizeof(struct bnxt_coredump_record);
+		/* The actual coredump length can be smaller than the FW
+		 * reported length earlier.  Use the ethtool provided length.
+		 */
+		if (buf_len)
+			*dump_len = buf_len;
+	} else if (rc == -ENOBUFS) {
 		netdev_err(bp->dev, "Firmware returned large coredump buffer\n");
+	}
 	return rc;
 }
 
-- 
2.30.1