bnxt_en: Add ethtool -S priority counters.

Display the CoS counters as additional priority counters by looking up
the priority to CoS queue mapping.  If the TX extended port statistics
block size returned by firmware is big enough to cover the CoS counters,
then we will display the new priority counters.  We call firmware to get
the up-to-date pri2cos mapping to convert the CoS counters to
priority counters.
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

@@ -6511,6 +6511,7 @@ static int bnxt_hwrm_port_qstats(struct bnxt *bp)
 static int bnxt_hwrm_port_qstats_ext(struct bnxt *bp)
 {
 	struct hwrm_port_qstats_ext_output *resp = bp->hwrm_cmd_resp_addr;
+	struct hwrm_queue_pri2cos_qcfg_input req2 = {0};
 	struct hwrm_port_qstats_ext_input req = {0};
 	struct bnxt_pf_info *pf = &bp->pf;
 	int rc;
@@ -6533,6 +6534,34 @@ static int bnxt_hwrm_port_qstats_ext(struct bnxt *bp)
 		bp->fw_rx_stats_ext_size = 0;
 		bp->fw_tx_stats_ext_size = 0;
 	}
+	if (bp->fw_tx_stats_ext_size <=
+	    offsetof(struct tx_port_stats_ext, pfc_pri0_tx_duration_us) / 8) {
+		mutex_unlock(&bp->hwrm_cmd_lock);
+		bp->pri2cos_valid = 0;
+		return rc;
+	}
+
+	bnxt_hwrm_cmd_hdr_init(bp, &req2, HWRM_QUEUE_PRI2COS_QCFG, -1, -1);
+	req2.flags = cpu_to_le32(QUEUE_PRI2COS_QCFG_REQ_FLAGS_IVLAN);
+
+	rc = _hwrm_send_message(bp, &req2, sizeof(req2), HWRM_CMD_TIMEOUT);
+	if (!rc) {
+		struct hwrm_queue_pri2cos_qcfg_output *resp2;
+		u8 *pri2cos;
+		int i, j;
+
+		resp2 = bp->hwrm_cmd_resp_addr;
+		pri2cos = &resp2->pri0_cos_queue_id;
+		for (i = 0; i < 8; i++) {
+			u8 queue_id = pri2cos[i];
+
+			for (j = 0; j < bp->max_q; j++) {
+				if (bp->q_ids[j] == queue_id)
+					bp->pri2cos[i] = j;
+			}
+		}
+		bp->pri2cos_valid = 1;
+	}
 	mutex_unlock(&bp->hwrm_cmd_lock);
 	return rc;
 }

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

@@ -1483,6 +1483,8 @@ struct bnxt {
 	int			hw_port_stats_size;
 	u16			fw_rx_stats_ext_size;
 	u16			fw_tx_stats_ext_size;
+	u8			pri2cos[8];
+	u8			pri2cos_valid;
 
 	u16			hwrm_max_req_len;
 	u16			hwrm_max_ext_req_len;

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

@@ -207,6 +207,34 @@ static int bnxt_set_coalesce(struct net_device *dev,
 	BNXT_TX_STATS_EXT_COS_ENTRY(6),				\
 	BNXT_TX_STATS_EXT_COS_ENTRY(7)				\
 
+#define BNXT_RX_STATS_PRI_ENTRY(counter, n)		\
+	{ BNXT_RX_STATS_EXT_OFFSET(counter##_cos0),	\
+	  __stringify(counter##_pri##n) }
+
+#define BNXT_TX_STATS_PRI_ENTRY(counter, n)		\
+	{ BNXT_TX_STATS_EXT_OFFSET(counter##_cos0),	\
+	  __stringify(counter##_pri##n) }
+
+#define BNXT_RX_STATS_PRI_ENTRIES(counter)		\
+	BNXT_RX_STATS_PRI_ENTRY(counter, 0),		\
+	BNXT_RX_STATS_PRI_ENTRY(counter, 1),		\
+	BNXT_RX_STATS_PRI_ENTRY(counter, 2),		\
+	BNXT_RX_STATS_PRI_ENTRY(counter, 3),		\
+	BNXT_RX_STATS_PRI_ENTRY(counter, 4),		\
+	BNXT_RX_STATS_PRI_ENTRY(counter, 5),		\
+	BNXT_RX_STATS_PRI_ENTRY(counter, 6),		\
+	BNXT_RX_STATS_PRI_ENTRY(counter, 7)
+
+#define BNXT_TX_STATS_PRI_ENTRIES(counter)		\
+	BNXT_TX_STATS_PRI_ENTRY(counter, 0),		\
+	BNXT_TX_STATS_PRI_ENTRY(counter, 1),		\
+	BNXT_TX_STATS_PRI_ENTRY(counter, 2),		\
+	BNXT_TX_STATS_PRI_ENTRY(counter, 3),		\
+	BNXT_TX_STATS_PRI_ENTRY(counter, 4),		\
+	BNXT_TX_STATS_PRI_ENTRY(counter, 5),		\
+	BNXT_TX_STATS_PRI_ENTRY(counter, 6),		\
+	BNXT_TX_STATS_PRI_ENTRY(counter, 7)
+
 enum {
 	RX_TOTAL_DISCARDS,
 	TX_TOTAL_DISCARDS,
@@ -327,8 +355,41 @@ static const struct {
 	BNXT_TX_STATS_EXT_PFC_ENTRIES,
 };
 
+static const struct {
+	long base_off;
+	char string[ETH_GSTRING_LEN];
+} bnxt_rx_bytes_pri_arr[] = {
+	BNXT_RX_STATS_PRI_ENTRIES(rx_bytes),
+};
+
+static const struct {
+	long base_off;
+	char string[ETH_GSTRING_LEN];
+} bnxt_rx_pkts_pri_arr[] = {
+	BNXT_RX_STATS_PRI_ENTRIES(rx_packets),
+};
+
+static const struct {
+	long base_off;
+	char string[ETH_GSTRING_LEN];
+} bnxt_tx_bytes_pri_arr[] = {
+	BNXT_TX_STATS_PRI_ENTRIES(tx_bytes),
+};
+
+static const struct {
+	long base_off;
+	char string[ETH_GSTRING_LEN];
+} bnxt_tx_pkts_pri_arr[] = {
+	BNXT_TX_STATS_PRI_ENTRIES(tx_packets),
+};
+
 #define BNXT_NUM_SW_FUNC_STATS	ARRAY_SIZE(bnxt_sw_func_stats)
 #define BNXT_NUM_PORT_STATS ARRAY_SIZE(bnxt_port_stats_arr)
+#define BNXT_NUM_STATS_PRI			\
+	(ARRAY_SIZE(bnxt_rx_bytes_pri_arr) +	\
+	 ARRAY_SIZE(bnxt_rx_pkts_pri_arr) +	\
+	 ARRAY_SIZE(bnxt_tx_bytes_pri_arr) +	\
+	 ARRAY_SIZE(bnxt_tx_pkts_pri_arr))
 
 static int bnxt_get_num_stats(struct bnxt *bp)
 {
@@ -339,9 +400,12 @@ static int bnxt_get_num_stats(struct bnxt *bp)
 	if (bp->flags & BNXT_FLAG_PORT_STATS)
 		num_stats += BNXT_NUM_PORT_STATS;
 
-	if (bp->flags & BNXT_FLAG_PORT_STATS_EXT)
+	if (bp->flags & BNXT_FLAG_PORT_STATS_EXT) {
 		num_stats += bp->fw_rx_stats_ext_size +
 			     bp->fw_tx_stats_ext_size;
+		if (bp->pri2cos_valid)
+			num_stats += BNXT_NUM_STATS_PRI;
+	}
 
 	return num_stats;
 }
@@ -415,6 +479,32 @@ static void bnxt_get_ethtool_stats(struct net_device *dev,
 			buf[j] = le64_to_cpu(*(tx_port_stats_ext +
 					bnxt_tx_port_stats_ext_arr[i].offset));
 		}
+		if (bp->pri2cos_valid) {
+			for (i = 0; i < 8; i++, j++) {
+				long n = bnxt_rx_bytes_pri_arr[i].base_off +
+					 bp->pri2cos[i];
+
+				buf[j] = le64_to_cpu(*(rx_port_stats_ext + n));
+			}
+			for (i = 0; i < 8; i++, j++) {
+				long n = bnxt_rx_pkts_pri_arr[i].base_off +
+					 bp->pri2cos[i];
+
+				buf[j] = le64_to_cpu(*(rx_port_stats_ext + n));
+			}
+			for (i = 0; i < 8; i++, j++) {
+				long n = bnxt_tx_bytes_pri_arr[i].base_off +
+					 bp->pri2cos[i];
+
+				buf[j] = le64_to_cpu(*(tx_port_stats_ext + n));
+			}
+			for (i = 0; i < 8; i++, j++) {
+				long n = bnxt_tx_pkts_pri_arr[i].base_off +
+					 bp->pri2cos[i];
+
+				buf[j] = le64_to_cpu(*(tx_port_stats_ext + n));
+			}
+		}
 	}
 }
 
@@ -493,6 +583,28 @@ static void bnxt_get_strings(struct net_device *dev, u32 stringset, u8 *buf)
 				       bnxt_tx_port_stats_ext_arr[i].string);
 				buf += ETH_GSTRING_LEN;
 			}
+			if (bp->pri2cos_valid) {
+				for (i = 0; i < 8; i++) {
+					strcpy(buf,
+					       bnxt_rx_bytes_pri_arr[i].string);
+					buf += ETH_GSTRING_LEN;
+				}
+				for (i = 0; i < 8; i++) {
+					strcpy(buf,
+					       bnxt_rx_pkts_pri_arr[i].string);
+					buf += ETH_GSTRING_LEN;
+				}
+				for (i = 0; i < 8; i++) {
+					strcpy(buf,
+					       bnxt_tx_bytes_pri_arr[i].string);
+					buf += ETH_GSTRING_LEN;
+				}
+				for (i = 0; i < 8; i++) {
+					strcpy(buf,
+					       bnxt_tx_pkts_pri_arr[i].string);
+					buf += ETH_GSTRING_LEN;
+				}
+			}
 		}
 		break;
 	case ETH_SS_TEST: