netdev - [PATCH net-next 3/7] bnxt_en: don't fake firmware response success when PCI is disabled

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Message-Id: <1616396925-16596-4-git-send-email-michael.chan@broadcom.com>
Date:   Mon, 22 Mar 2021 03:08:41 -0400
From:   Michael Chan <michael.chan@...adcom.com>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, kuba@...nel.org, gospo@...adcom.com
Subject: [PATCH net-next 3/7] bnxt_en: don't fake firmware response success when PCI is disabled

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

The original intent here is to allow commands during reset to succeed
without error when the device is disabled, to ensure that cleanup
completes normally during NIC close, where firmware is not necessarily
expected to respond.

The problem with faking success during reset's PCI disablement is that
unrelated ULP commands will also see inadvertent success during reset
when failure would otherwise be appropriate. It is better to return
a different error result such that reset related code can detect
this unique condition and ignore as appropriate.

Note, the pci_disable_device() when firmware is fatally wounded in
bnxt_fw_reset_close() does not need to be addressed, as subsequent
commands are already expected to fail due to the BNXT_NO_FW_ACCESS()
check in bnxt_hwrm_do_send_msg().

Reviewed-by: Scott Branden <scott.branden@...adcom.com>
Signed-off-by: Edwin Peer <edwin.peer@...adcom.com>
Signed-off-by: Michael Chan <michael.chan@...adcom.com>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index deba552465f6..3624e79667b6 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -4470,7 +4470,7 @@ static int bnxt_hwrm_do_send_msg(struct bnxt *bp, void *msg, u32 msg_len,
 	writel(1, bp->bar0 + doorbell_offset);

 	if (!pci_is_enabled(bp->pdev))
-		return 0;
+		return -ENODEV;

 	if (!timeout)
 		timeout = DFLT_HWRM_CMD_TIMEOUT;
@@ -11680,7 +11680,7 @@ static void bnxt_reset_all(struct bnxt *bp)
 		req.selfrst_status = FW_RESET_REQ_SELFRST_STATUS_SELFRSTASAP;
 		req.flags = FW_RESET_REQ_FLAGS_RESET_GRACEFUL;
 		rc = hwrm_send_message(bp, &req, sizeof(req), HWRM_CMD_TIMEOUT);
-		if (rc)
+		if (rc != -ENODEV)
 			netdev_warn(bp->dev, "Unable to reset FW rc=%d\n", rc);
 	}
 	bp->fw_reset_timestamp = jiffies;
-- 
2.18.1