bnxt_en: Retrieve coredump and crashdump size via FW command

Recent firmware provides coredump and crashdump size info via
DBG_QCFG command. Read the dump sizes from firmware, instead of
computing in the driver. This patch reduces the time taken
to collect the dump via ethtool.
Signed-off-by: Vasundhara Volam <vasundhara-v.volam@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bnxt/bnxt.c

@@ -7480,6 +7480,8 @@ static int __bnxt_hwrm_func_qcaps(struct bnxt *bp)
 		bp->fw_cap |= BNXT_FW_CAP_ERR_RECOVER_RELOAD;
 	if (!(flags & FUNC_QCAPS_RESP_FLAGS_VLAN_ACCELERATION_TX_DISABLED))
 		bp->fw_cap |= BNXT_FW_CAP_VLAN_TX_INSERT;
+	if (flags & FUNC_QCAPS_RESP_FLAGS_DBG_QCAPS_CMD_SUPPORTED)
+		bp->fw_cap |= BNXT_FW_CAP_DBG_QCAPS;
 
 	flags_ext = le32_to_cpu(resp->flags_ext);
 	if (flags_ext & FUNC_QCAPS_RESP_FLAGS_EXT_EXT_HW_STATS_SUPPORTED)
@@ -7543,6 +7545,32 @@ static int __bnxt_hwrm_func_qcaps(struct bnxt *bp)
 	return rc;
 }
 
+static void bnxt_hwrm_dbg_qcaps(struct bnxt *bp)
+{
+	struct hwrm_dbg_qcaps_output *resp;
+	struct hwrm_dbg_qcaps_input *req;
+	int rc;
+
+	bp->fw_dbg_cap = 0;
+	if (!(bp->fw_cap & BNXT_FW_CAP_DBG_QCAPS))
+		return;
+
+	rc = hwrm_req_init(bp, req, HWRM_DBG_QCAPS);
+	if (rc)
+		return;
+
+	req->fid = cpu_to_le16(0xffff);
+	resp = hwrm_req_hold(bp, req);
+	rc = hwrm_req_send(bp, req);
+	if (rc)
+		goto hwrm_dbg_qcaps_exit;
+
+	bp->fw_dbg_cap = le32_to_cpu(resp->flags);
+
+hwrm_dbg_qcaps_exit:
+	hwrm_req_drop(bp, req);
+}
+
 static int bnxt_hwrm_queue_qportcfg(struct bnxt *bp);
 
 static int bnxt_hwrm_func_qcaps(struct bnxt *bp)
@@ -7552,6 +7580,9 @@ static int bnxt_hwrm_func_qcaps(struct bnxt *bp)
 	rc = __bnxt_hwrm_func_qcaps(bp);
 	if (rc)
 		return rc;
+
+	bnxt_hwrm_dbg_qcaps(bp);
+
 	rc = bnxt_hwrm_queue_qportcfg(bp);
 	if (rc) {
 		netdev_err(bp->dev, "hwrm query qportcfg failure rc: %d\n", rc);

drivers/net/ethernet/broadcom/bnxt/bnxt.h

@@ -1961,6 +1961,9 @@ struct bnxt {
 	#define BNXT_FW_CAP_PTP_PPS			0x10000000
 	#define BNXT_FW_CAP_HOT_RESET_IF		0x20000000
 	#define BNXT_FW_CAP_RING_MONITOR		0x40000000
+	#define BNXT_FW_CAP_DBG_QCAPS			0x80000000
+
+	u32			fw_dbg_cap;
 
 #define BNXT_NEW_RM(bp)		((bp)->fw_cap & BNXT_FW_CAP_NEW_RM)
 	u32			hwrm_spec_code;

drivers/net/ethernet/broadcom/bnxt/bnxt_coredump.c

@@ -361,13 +361,60 @@ int bnxt_get_coredump(struct bnxt *bp, u16 dump_type, void *buf, u32 *dump_len)
 	}
 }
 
+static int bnxt_hwrm_get_dump_len(struct bnxt *bp, u16 dump_type, u32 *dump_len)
+{
+	struct hwrm_dbg_qcfg_output *resp;
+	struct hwrm_dbg_qcfg_input *req;
+	int rc, hdr_len = 0;
+
+	if (!(bp->fw_cap & BNXT_FW_CAP_DBG_QCAPS))
+		return -EOPNOTSUPP;
+
+	if (dump_type == BNXT_DUMP_CRASH &&
+	    !(bp->fw_dbg_cap & DBG_QCAPS_RESP_FLAGS_CRASHDUMP_SOC_DDR))
+		return -EOPNOTSUPP;
+
+	rc = hwrm_req_init(bp, req, HWRM_DBG_QCFG);
+	if (rc)
+		return rc;
+
+	req->fid = cpu_to_le16(0xffff);
+	if (dump_type == BNXT_DUMP_CRASH)
+		req->flags = cpu_to_le16(DBG_QCFG_REQ_FLAGS_CRASHDUMP_SIZE_FOR_DEST_DEST_SOC_DDR);
+
+	resp = hwrm_req_hold(bp, req);
+	rc = hwrm_req_send(bp, req);
+	if (rc)
+		goto get_dump_len_exit;
+
+	if (dump_type == BNXT_DUMP_CRASH) {
+		*dump_len = le32_to_cpu(resp->crashdump_size);
+	} else {
+		/* Driver adds coredump header and "HWRM_VER_GET response"
+		 * segment additionally to coredump.
+		 */
+		hdr_len = sizeof(struct bnxt_coredump_segment_hdr) +
+		sizeof(struct hwrm_ver_get_output) +
+		sizeof(struct bnxt_coredump_record);
+		*dump_len = le32_to_cpu(resp->coredump_size) + hdr_len;
+	}
+	if (*dump_len <= hdr_len)
+		rc = -EINVAL;
+
+get_dump_len_exit:
+	hwrm_req_drop(bp, req);
+	return rc;
+}
+
 u32 bnxt_get_coredump_length(struct bnxt *bp, u16 dump_type)
 {
 	u32 len = 0;
 
+	if (bnxt_hwrm_get_dump_len(bp, dump_type, &len)) {
 		if (dump_type == BNXT_DUMP_CRASH)
 			len = BNXT_CRASH_DUMP_LEN;
 		else
 			__bnxt_get_coredump(bp, NULL, &len);
+	}
 	return len;
 }