bnxt_en: add enable_remote_dev_reset devlink parameter

The reported parameter value should not take into account the state
of remote drivers. Firmware will reject remote resets as appropriate,
thus it is not strictly necessary to check HOT_RESET_ALLOWED before
attempting to initiate a reset. But we add the check so that we can
provide more intuitive messages when reset is not permitted.

This firmware setting needs to be restored from all functions after
a firmware reset.

Signed-off-by: Edwin Peer <edwin.peer@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 23 insertions, 0 deletions

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index cd5932c75997..80fff3d8b31f 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -7476,6 +7476,8 @@ static int __bnxt_hwrm_func_qcaps(struct bnxt *bp)
 		bp->fw_cap |= BNXT_FW_CAP_EXT_HW_STATS_SUPPORTED;
 	if (BNXT_PF(bp) && (flags_ext & FUNC_QCAPS_RESP_FLAGS_EXT_PTP_PPS_SUPPORTED))
 		bp->fw_cap |= BNXT_FW_CAP_PTP_PPS;
+	if (BNXT_PF(bp) && (flags_ext & FUNC_QCAPS_RESP_FLAGS_EXT_HOT_RESET_IF_SUPPORT))
+		bp->fw_cap |= BNXT_FW_CAP_HOT_RESET_IF;
 
 	bp->tx_push_thresh = 0;
 	if ((flags & FUNC_QCAPS_RESP_FLAGS_PUSH_MODE_SUPPORTED) &&
@@ -12010,6 +12012,27 @@ static void bnxt_fw_reset_writel(struct bnxt *bp, int reg_idx)
 	}
 }
 
+bool bnxt_hwrm_reset_permitted(struct bnxt *bp)
+{
+	struct hwrm_func_qcfg_output *resp;
+	struct hwrm_func_qcfg_input *req;
+	bool result = true; /* firmware will enforce if unknown */
+
+	if (~bp->fw_cap & BNXT_FW_CAP_HOT_RESET_IF)
+		return result;
+
+	if (hwrm_req_init(bp, req, HWRM_FUNC_QCFG))
+		return result;
+
+	req->fid = cpu_to_le16(0xffff);
+	resp = hwrm_req_hold(bp, req);
+	if (!hwrm_req_send(bp, req))
+		result = !!(le16_to_cpu(resp->flags) &
+			    FUNC_QCFG_RESP_FLAGS_HOT_RESET_ALLOWED);
+	hwrm_req_drop(bp, req);
+	return result;
+}
+
 static void bnxt_reset_all(struct bnxt *bp)
 {
 	struct bnxt_fw_health *fw_health = bp->fw_health;