bnxt_en: Discover firmware error recovery capabilities.

Call the new firmware API HWRM_ERROR_RECOVERY_QCFG if it is supported
to discover the firmware health and recovery capabilities and settings.
This feature allows the driver to reset the chip if firmware crashes and
becomes unresponsive.

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

1 files changed, 77 insertions, 0 deletions

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 303933b8c44e..825a7f945e51 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -6847,6 +6847,8 @@ static int __bnxt_hwrm_func_qcaps(struct bnxt *bp)
 		bp->fw_cap |= BNXT_FW_CAP_PCIE_STATS_SUPPORTED;
 	if (flags & FUNC_QCAPS_RESP_FLAGS_EXT_STATS_SUPPORTED)
 		bp->fw_cap |= BNXT_FW_CAP_EXT_STATS_SUPPORTED;
+	if (flags &  FUNC_QCAPS_RESP_FLAGS_ERROR_RECOVERY_CAPABLE)
+		bp->fw_cap |= BNXT_FW_CAP_ERROR_RECOVERY;
 
 	bp->tx_push_thresh = 0;
 	if (flags & FUNC_QCAPS_RESP_FLAGS_PUSH_MODE_SUPPORTED)
@@ -6948,6 +6950,74 @@ hwrm_cfa_adv_qcaps_exit:
 	return rc;
 }
 
+static int bnxt_hwrm_error_recovery_qcfg(struct bnxt *bp)
+{
+	struct hwrm_error_recovery_qcfg_output *resp = bp->hwrm_cmd_resp_addr;
+	struct bnxt_fw_health *fw_health = bp->fw_health;
+	struct hwrm_error_recovery_qcfg_input req = {0};
+	int rc, i;
+
+	if (!(bp->fw_cap & BNXT_FW_CAP_ERROR_RECOVERY))
+		return 0;
+
+	bnxt_hwrm_cmd_hdr_init(bp, &req, HWRM_ERROR_RECOVERY_QCFG, -1, -1);
+	mutex_lock(&bp->hwrm_cmd_lock);
+	rc = _hwrm_send_message(bp, &req, sizeof(req), HWRM_CMD_TIMEOUT);
+	if (rc)
+		goto err_recovery_out;
+	if (!fw_health) {
+		fw_health = kzalloc(sizeof(*fw_health), GFP_KERNEL);
+		bp->fw_health = fw_health;
+		if (!fw_health) {
+			rc = -ENOMEM;
+			goto err_recovery_out;
+		}
+	}
+	fw_health->flags = le32_to_cpu(resp->flags);
+	if ((fw_health->flags & ERROR_RECOVERY_QCFG_RESP_FLAGS_CO_CPU) &&
+	    !(bp->fw_cap & BNXT_FW_CAP_KONG_MB_CHNL)) {
+		rc = -EINVAL;
+		goto err_recovery_out;
+	}
+	fw_health->polling_dsecs = le32_to_cpu(resp->driver_polling_freq);
+	fw_health->master_func_wait_dsecs =
+		le32_to_cpu(resp->master_func_wait_period);
+	fw_health->normal_func_wait_dsecs =
+		le32_to_cpu(resp->normal_func_wait_period);
+	fw_health->post_reset_wait_dsecs =
+		le32_to_cpu(resp->master_func_wait_period_after_reset);
+	fw_health->post_reset_max_wait_dsecs =
+		le32_to_cpu(resp->max_bailout_time_after_reset);
+	fw_health->regs[BNXT_FW_HEALTH_REG] =
+		le32_to_cpu(resp->fw_health_status_reg);
+	fw_health->regs[BNXT_FW_HEARTBEAT_REG] =
+		le32_to_cpu(resp->fw_heartbeat_reg);
+	fw_health->regs[BNXT_FW_RESET_CNT_REG] =
+		le32_to_cpu(resp->fw_reset_cnt_reg);
+	fw_health->regs[BNXT_FW_RESET_INPROG_REG] =
+		le32_to_cpu(resp->reset_inprogress_reg);
+	fw_health->fw_reset_inprog_reg_mask =
+		le32_to_cpu(resp->reset_inprogress_reg_mask);
+	fw_health->fw_reset_seq_cnt = resp->reg_array_cnt;
+	if (fw_health->fw_reset_seq_cnt >= 16) {
+		rc = -EINVAL;
+		goto err_recovery_out;
+	}
+	for (i = 0; i < fw_health->fw_reset_seq_cnt; i++) {
+		fw_health->fw_reset_seq_regs[i] =
+			le32_to_cpu(resp->reset_reg[i]);
+		fw_health->fw_reset_seq_vals[i] =
+			le32_to_cpu(resp->reset_reg_val[i]);
+		fw_health->fw_reset_seq_delay_msec[i] =
+			resp->delay_after_reset[i];
+	}
+err_recovery_out:
+	mutex_unlock(&bp->hwrm_cmd_lock);
+	if (rc)
+		bp->fw_cap &= ~BNXT_FW_CAP_ERROR_RECOVERY;
+	return rc;
+}
+
 static int bnxt_hwrm_func_reset(struct bnxt *bp)
 {
 	struct hwrm_func_reset_input req = {0};
@@ -10058,6 +10128,11 @@ static int bnxt_fw_init_one_p2(struct bnxt *bp)
 		netdev_warn(bp->dev, "hwrm query adv flow mgnt failure rc: %d\n",
 			    rc);
 
+	rc = bnxt_hwrm_error_recovery_qcfg(bp);
+	if (rc)
+		netdev_warn(bp->dev, "hwrm query error recovery failure rc: %d\n",
+			    rc);
+
 	rc = bnxt_hwrm_func_drv_rgtr(bp);
 	if (rc)
 		return -ENODEV;
@@ -11238,6 +11313,8 @@ init_err_pci_clean:
 	bnxt_free_ctx_mem(bp);
 	kfree(bp->ctx);
 	bp->ctx = NULL;
+	kfree(bp->fw_health);
+	bp->fw_health = NULL;
 	bnxt_cleanup_pci(bp);
 
 init_err_free: