[PATCH 5.0 23/32] bnxt_en: Pass correct extended TX port statistics size to firmware.

Greg Kroah-Hartman
2019-05-04T10:26:19Z

From: Michael Chan <michael.chan@broadcom.com>

[ Upstream commit ad361adf0d08f1135f3845c6b3a36be7cc0bfda5 ]

If driver determines that extended TX port statistics are not supported
or allocation of the data structure fails, make sure to pass 0 TX stats
size to firmware to disable it. The firmware returned TX stats size should
also be set to 0 for consistency. This will prevent
bnxt_get_ethtool_stats() from accessing the NULL TX stats pointer in
case there is mismatch between firmware and driver.

Fixes: 36e53349b60b ("bnxt_en: Add additional extended port statistics.")
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/ethernet/broadcom/bnxt/bnxt.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)

--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -6745,6 +6745,7 @@ static int bnxt_hwrm_port_qstats_ext(str
struct hwrm_queue_pri2cos_qcfg_input req2 = {0};
struct hwrm_port_qstats_ext_input req = {0};
struct bnxt_pf_info *pf = &bp->pf;
+ u32 tx_stat_size;
int rc;

if (!(bp->flags & BNXT_FLAG_PORT_STATS_EXT))
@@ -6754,13 +6755,16 @@ static int bnxt_hwrm_port_qstats_ext(str
req.port_id = cpu_to_le16(pf->port_id);
req.rx_stat_size = cpu_to_le16(sizeof(struct rx_port_stats_ext));
req.rx_stat_host_addr = cpu_to_le64(bp->hw_rx_port_stats_ext_map);
- req.tx_stat_size = cpu_to_le16(sizeof(struct tx_port_stats_ext));
+ tx_stat_size = bp->hw_tx_port_stats_ext ?
+ sizeof(*bp->hw_tx_port_stats_ext) : 0;
+ req.tx_stat_size = cpu_to_le16(tx_stat_size);
req.tx_stat_host_addr = cpu_to_le64(bp->hw_tx_port_stats_ext_map);
mutex_lock(&bp->hwrm_cmd_lock);
rc = _hwrm_send_message(bp, &req, sizeof(req), HWRM_CMD_TIMEOUT);
if (!rc) {
bp->fw_rx_stats_ext_size = le16_to_cpu(resp->rx_stat_size) / 8;
- bp->fw_tx_stats_ext_size = le16_to_cpu(resp->tx_stat_size) / 8;
+ bp->fw_tx_stats_ext_size = tx_stat_size ?
+ le16_to_cpu(resp->tx_stat_size) / 8 : 0;
} else {
bp->fw_rx_stats_ext_size = 0;
bp->fw_tx_stats_ext_size = 0;