Merge branch 'ionic-cleanups'

Shannon Nelson says:

====================
ionic: code cleanup for heartbeat, dma error counts, sizeof, stats

These patches are a few more bits of code cleanup found in
testing and review: count all our dma error instances, make
better use of sizeof, fix a race in our device heartbeat check,
and clean up code formatting in the ethtool stats collection.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/pensando/ionic/ionic_dev.c

@@ -24,6 +24,9 @@ static void ionic_watchdog_cb(struct timer_list *t)
 		return;
 
 	hb = ionic_heartbeat_check(ionic);
+	dev_dbg(ionic->dev, "%s: hb %d running %d UP %d\n",
+		__func__, hb, netif_running(lif->netdev),
+		test_bit(IONIC_LIF_F_UP, lif->state));
 
 	if (hb >= 0 &&
 	    !test_bit(IONIC_LIF_F_FW_RESET, lif->state))
@@ -91,9 +94,17 @@ int ionic_dev_setup(struct ionic *ionic)
 		return -EFAULT;
 	}
 
-	idev->last_fw_status = 0xff;
 	timer_setup(&ionic->watchdog_timer, ionic_watchdog_cb, 0);
 	ionic->watchdog_period = IONIC_WATCHDOG_SECS * HZ;
+
+	/* set times to ensure the first check will proceed */
+	atomic_long_set(&idev->last_check_time, jiffies - 2 * HZ);
+	idev->last_hb_time = jiffies - 2 * ionic->watchdog_period;
+	/* init as ready, so no transition if the first check succeeds */
+	idev->last_fw_hb = 0;
+	idev->fw_hb_ready = true;
+	idev->fw_status_ready = true;
+
 	mod_timer(&ionic->watchdog_timer,
 		  round_jiffies(jiffies + ionic->watchdog_period));
 
@@ -107,29 +118,38 @@ int ionic_dev_setup(struct ionic *ionic)
 int ionic_heartbeat_check(struct ionic *ionic)
 {
 	struct ionic_dev *idev = &ionic->idev;
-	unsigned long hb_time;
+	unsigned long check_time, last_check_time;
+	bool fw_status_ready, fw_hb_ready;
 	u8 fw_status;
-	u32 hb;
+	u32 fw_hb;
 
-	/* wait a little more than one second before testing again */
-	hb_time = jiffies;
-	if (time_before(hb_time, (idev->last_hb_time + ionic->watchdog_period)))
+	/* wait a least one second before testing again */
+	check_time = jiffies;
+	last_check_time = atomic_long_read(&idev->last_check_time);
+do_check_time:
+	if (time_before(check_time, last_check_time + HZ))
 		return 0;
+	if (!atomic_long_try_cmpxchg_relaxed(&idev->last_check_time,
+					     &last_check_time, check_time)) {
+		/* if called concurrently, only the first should proceed. */
+		dev_dbg(ionic->dev, "%s: do_check_time again\n", __func__);
+		goto do_check_time;
+	}
 
 	/* firmware is useful only if the running bit is set and
 	 * fw_status != 0xff (bad PCI read)
 	 */
 	fw_status = ioread8(&idev->dev_info_regs->fw_status);
-	if (fw_status != 0xff)
-		fw_status &= IONIC_FW_STS_F_RUNNING;  /* use only the run bit */
+	fw_status_ready = (fw_status != 0xff) && (fw_status & IONIC_FW_STS_F_RUNNING);
 
 	/* is this a transition? */
-	if (fw_status != idev->last_fw_status &&
-	    idev->last_fw_status != 0xff) {
+	if (fw_status_ready != idev->fw_status_ready) {
 		struct ionic_lif *lif = ionic->lif;
 		bool trigger = false;
 
-		if (!fw_status || fw_status == 0xff) {
+		idev->fw_status_ready = fw_status_ready;
+
+		if (!fw_status_ready) {
 			dev_info(ionic->dev, "FW stopped %u\n", fw_status);
 			if (lif && !test_bit(IONIC_LIF_F_FW_RESET, lif->state))
 				trigger = true;
@@ -143,44 +163,47 @@ int ionic_heartbeat_check(struct ionic *ionic)
 			struct ionic_deferred_work *work;
 
 			work = kzalloc(sizeof(*work), GFP_ATOMIC);
-			if (!work) {
-				dev_err(ionic->dev, "LIF reset trigger dropped\n");
-			} else {
+			if (work) {
 				work->type = IONIC_DW_TYPE_LIF_RESET;
-				if (fw_status & IONIC_FW_STS_F_RUNNING &&
-				    fw_status != 0xff)
-					work->fw_status = 1;
+				work->fw_status = fw_status_ready;
 				ionic_lif_deferred_enqueue(&lif->deferred, work);
 			}
 		}
 	}
-	idev->last_fw_status = fw_status;
 
-	if (!fw_status || fw_status == 0xff)
+	if (!fw_status_ready)
 		return -ENXIO;
 
-	/* early FW has no heartbeat, else FW will return non-zero */
-	hb = ioread32(&idev->dev_info_regs->fw_heartbeat);
-	if (!hb)
+	/* wait at least one watchdog period since the last heartbeat */
+	last_check_time = idev->last_hb_time;
+	if (time_before(check_time, last_check_time + ionic->watchdog_period))
 		return 0;
 
-	/* are we stalled? */
-	if (hb == idev->last_hb) {
-		/* only complain once for each stall seen */
-		if (idev->last_hb_time != 1) {
-			dev_info(ionic->dev, "FW heartbeat stalled at %d\n",
-				 idev->last_hb);
-			idev->last_hb_time = 1;
-		}
+	fw_hb = ioread32(&idev->dev_info_regs->fw_heartbeat);
+	fw_hb_ready = fw_hb != idev->last_fw_hb;
 
-		return -ENXIO;
+	/* early FW version had no heartbeat, so fake it */
+	if (!fw_hb_ready && !fw_hb)
+		fw_hb_ready = true;
+
+	dev_dbg(ionic->dev, "%s: fw_hb %u last_fw_hb %u ready %u\n",
+		__func__, fw_hb, idev->last_fw_hb, fw_hb_ready);
+
+	idev->last_fw_hb = fw_hb;
+
+	/* log a transition */
+	if (fw_hb_ready != idev->fw_hb_ready) {
+		idev->fw_hb_ready = fw_hb_ready;
+		if (!fw_hb_ready)
+			dev_info(ionic->dev, "FW heartbeat stalled at %d\n", fw_hb);
+		else
+			dev_info(ionic->dev, "FW heartbeat restored at %d\n", fw_hb);
 	}
 
-	if (idev->last_hb_time == 1)
-		dev_info(ionic->dev, "FW heartbeat restored at %d\n", hb);
+	if (!fw_hb_ready)
+		return -ENXIO;
 
-	idev->last_hb = hb;
-	idev->last_hb_time = hb_time;
+	idev->last_hb_time = check_time;
 
 	return 0;
 }

drivers/net/ethernet/pensando/ionic/ionic_dev.h

@@ -4,6 +4,7 @@
 #ifndef _IONIC_DEV_H_
 #define _IONIC_DEV_H_
 
+#include <linux/atomic.h>
 #include <linux/mutex.h>
 #include <linux/workqueue.h>
 
@@ -135,9 +136,11 @@ struct ionic_dev {
 	union ionic_dev_info_regs __iomem *dev_info_regs;
 	union ionic_dev_cmd_regs __iomem *dev_cmd_regs;
 
+	atomic_long_t last_check_time;
 	unsigned long last_hb_time;
-	u32 last_hb;
-	u8 last_fw_status;
+	u32 last_fw_hb;
+	bool fw_hb_ready;
+	bool fw_status_ready;
 
 	u64 __iomem *db_pages;
 	dma_addr_t phy_db_pages;

drivers/net/ethernet/pensando/ionic/ionic_lif.c

@@ -676,20 +676,20 @@ static int ionic_qcqs_alloc(struct ionic_lif *lif)
 
 	err = -ENOMEM;
 	lif->txqcqs = devm_kcalloc(dev, lif->ionic->ntxqs_per_lif,
-				   sizeof(struct ionic_qcq *), GFP_KERNEL);
+				   sizeof(*lif->txqcqs), GFP_KERNEL);
 	if (!lif->txqcqs)
 		goto err_out;
 	lif->rxqcqs = devm_kcalloc(dev, lif->ionic->nrxqs_per_lif,
-				   sizeof(struct ionic_qcq *), GFP_KERNEL);
+				   sizeof(*lif->rxqcqs), GFP_KERNEL);
 	if (!lif->rxqcqs)
 		goto err_out;
 
 	lif->txqstats = devm_kcalloc(dev, lif->ionic->ntxqs_per_lif,
-				     sizeof(struct ionic_tx_stats), GFP_KERNEL);
+				     sizeof(*lif->txqstats), GFP_KERNEL);
 	if (!lif->txqstats)
 		goto err_out;
 	lif->rxqstats = devm_kcalloc(dev, lif->ionic->nrxqs_per_lif,
-				     sizeof(struct ionic_rx_stats), GFP_KERNEL);
+				     sizeof(*lif->rxqstats), GFP_KERNEL);
 	if (!lif->rxqstats)
 		goto err_out;
 

drivers/net/ethernet/pensando/ionic/ionic_stats.c

@@ -177,31 +177,42 @@ static const struct ionic_stat_desc ionic_dbg_napi_stats_desc[] = {
 
 #define MAX_Q(lif)   ((lif)->netdev->real_num_tx_queues)
 
-static void ionic_get_lif_stats(struct ionic_lif *lif,
+static void ionic_add_lif_txq_stats(struct ionic_lif *lif, int q_num,
 				    struct ionic_lif_sw_stats *stats)
 {
-	struct ionic_tx_stats *txstats;
-	struct ionic_rx_stats *rxstats;
-	struct rtnl_link_stats64 ns;
-	int q_num;
-
-	memset(stats, 0, sizeof(*stats));
+	struct ionic_tx_stats *txstats = &lif->txqstats[q_num];
 
-	for (q_num = 0; q_num < MAX_Q(lif); q_num++) {
-		txstats = &lif->txqstats[q_num];
 	stats->tx_packets += txstats->pkts;
 	stats->tx_bytes += txstats->bytes;
 	stats->tx_tso += txstats->tso;
 	stats->tx_tso_bytes += txstats->tso_bytes;
 	stats->tx_csum_none += txstats->csum_none;
 	stats->tx_csum += txstats->csum;
+}
+
+static void ionic_add_lif_rxq_stats(struct ionic_lif *lif, int q_num,
+				    struct ionic_lif_sw_stats *stats)
+{
+	struct ionic_rx_stats *rxstats = &lif->rxqstats[q_num];
 
-		rxstats = &lif->rxqstats[q_num];
 	stats->rx_packets += rxstats->pkts;
 	stats->rx_bytes += rxstats->bytes;
 	stats->rx_csum_none += rxstats->csum_none;
 	stats->rx_csum_complete += rxstats->csum_complete;
 	stats->rx_csum_error += rxstats->csum_error;
+}
+
+static void ionic_get_lif_stats(struct ionic_lif *lif,
+				struct ionic_lif_sw_stats *stats)
+{
+	struct rtnl_link_stats64 ns;
+	int q_num;
+
+	memset(stats, 0, sizeof(*stats));
+
+	for (q_num = 0; q_num < MAX_Q(lif); q_num++) {
+		ionic_add_lif_txq_stats(lif, q_num, stats);
+		ionic_add_lif_rxq_stats(lif, q_num, stats);
 	}
 
 	ionic_get_stats64(lif->netdev, &ns);
@@ -214,16 +225,12 @@ static void ionic_get_lif_stats(struct ionic_lif *lif,
 
 static u64 ionic_sw_stats_get_count(struct ionic_lif *lif)
 {
-	u64 total = 0;
+	u64 total = 0, tx_queues = MAX_Q(lif), rx_queues = MAX_Q(lif);
 
 	/* lif stats */
 	total += IONIC_NUM_LIF_STATS;
-
-	/* tx stats */
-	total += MAX_Q(lif) * IONIC_NUM_TX_STATS;
-
-	/* rx stats */
-	total += MAX_Q(lif) * IONIC_NUM_RX_STATS;
+	total += tx_queues * IONIC_NUM_TX_STATS;
+	total += rx_queues * IONIC_NUM_RX_STATS;
 
 	/* port stats */
 	total += IONIC_NUM_PORT_STATS;
@@ -231,13 +238,13 @@ static u64 ionic_sw_stats_get_count(struct ionic_lif *lif)
 	if (test_bit(IONIC_LIF_F_UP, lif->state) &&
 	    test_bit(IONIC_LIF_F_SW_DEBUG_STATS, lif->state)) {
 		/* tx debug stats */
-		total += MAX_Q(lif) * (IONIC_NUM_DBG_CQ_STATS +
+		total += tx_queues * (IONIC_NUM_DBG_CQ_STATS +
 				      IONIC_NUM_TX_Q_STATS +
 				      IONIC_NUM_DBG_INTR_STATS +
 				      IONIC_MAX_NUM_SG_CNTR);
 
 		/* rx debug stats */
-		total += MAX_Q(lif) * (IONIC_NUM_DBG_CQ_STATS +
+		total += rx_queues * (IONIC_NUM_DBG_CQ_STATS +
 				      IONIC_NUM_DBG_INTR_STATS +
 				      IONIC_NUM_DBG_NAPI_STATS +
 				      IONIC_MAX_NUM_NAPI_CNTR);
@@ -315,40 +322,24 @@ static void ionic_sw_stats_get_strings(struct ionic_lif *lif, u8 **buf)
 		ionic_sw_stats_get_rx_strings(lif, buf, q_num);
 }
 
-static void ionic_sw_stats_get_values(struct ionic_lif *lif, u64 **buf)
+static void ionic_sw_stats_get_txq_values(struct ionic_lif *lif, u64 **buf,
+					  int q_num)
 {
-	struct ionic_port_stats *port_stats;
-	struct ionic_lif_sw_stats lif_stats;
-	struct ionic_qcq *txqcq, *rxqcq;
 	struct ionic_tx_stats *txstats;
-	struct ionic_rx_stats *rxstats;
-	int i, q_num;
-
-	ionic_get_lif_stats(lif, &lif_stats);
-
-	for (i = 0; i < IONIC_NUM_LIF_STATS; i++) {
-		**buf = IONIC_READ_STAT64(&lif_stats, &ionic_lif_stats_desc[i]);
-		(*buf)++;
-	}
-
-	port_stats = &lif->ionic->idev.port_info->stats;
-	for (i = 0; i < IONIC_NUM_PORT_STATS; i++) {
-		**buf = IONIC_READ_STAT_LE64(port_stats,
-					     &ionic_port_stats_desc[i]);
-		(*buf)++;
-	}
+	struct ionic_qcq *txqcq;
+	int i;
 
-	for (q_num = 0; q_num < MAX_Q(lif); q_num++) {
 	txstats = &lif->txqstats[q_num];
 
 	for (i = 0; i < IONIC_NUM_TX_STATS; i++) {
-			**buf = IONIC_READ_STAT64(txstats,
-						  &ionic_tx_stats_desc[i]);
+		**buf = IONIC_READ_STAT64(txstats, &ionic_tx_stats_desc[i]);
 		(*buf)++;
 	}
 
-		if (test_bit(IONIC_LIF_F_UP, lif->state) &&
-		    test_bit(IONIC_LIF_F_SW_DEBUG_STATS, lif->state)) {
+	if (!test_bit(IONIC_LIF_F_UP, lif->state) ||
+	    !test_bit(IONIC_LIF_F_SW_DEBUG_STATS, lif->state))
+		return;
+
 	txqcq = lif->txqcqs[q_num];
 	for (i = 0; i < IONIC_NUM_TX_Q_STATS; i++) {
 		**buf = IONIC_READ_STAT64(&txqcq->q,
@@ -365,24 +356,39 @@ static void ionic_sw_stats_get_values(struct ionic_lif *lif, u64 **buf)
 					  &ionic_dbg_intr_stats_desc[i]);
 		(*buf)++;
 	}
-			for (i = 0; i < IONIC_MAX_NUM_SG_CNTR; i++) {
-				**buf = txstats->sg_cntr[i];
+	for (i = 0; i < IONIC_NUM_DBG_NAPI_STATS; i++) {
+		**buf = IONIC_READ_STAT64(&txqcq->napi_stats,
+					  &ionic_dbg_napi_stats_desc[i]);
 		(*buf)++;
 	}
+	for (i = 0; i < IONIC_MAX_NUM_NAPI_CNTR; i++) {
+		**buf = txqcq->napi_stats.work_done_cntr[i];
+		(*buf)++;
 	}
+	for (i = 0; i < IONIC_MAX_NUM_SG_CNTR; i++) {
+		**buf = txstats->sg_cntr[i];
+		(*buf)++;
 	}
+}
+
+static void ionic_sw_stats_get_rxq_values(struct ionic_lif *lif, u64 **buf,
+					  int q_num)
+{
+	struct ionic_rx_stats *rxstats;
+	struct ionic_qcq *rxqcq;
+	int i;
 
-	for (q_num = 0; q_num < MAX_Q(lif); q_num++) {
 	rxstats = &lif->rxqstats[q_num];
 
 	for (i = 0; i < IONIC_NUM_RX_STATS; i++) {
-			**buf = IONIC_READ_STAT64(rxstats,
-						  &ionic_rx_stats_desc[i]);
+		**buf = IONIC_READ_STAT64(rxstats, &ionic_rx_stats_desc[i]);
 		(*buf)++;
 	}
 
-		if (test_bit(IONIC_LIF_F_UP, lif->state) &&
-		    test_bit(IONIC_LIF_F_SW_DEBUG_STATS, lif->state)) {
+	if (!test_bit(IONIC_LIF_F_UP, lif->state) ||
+	    !test_bit(IONIC_LIF_F_SW_DEBUG_STATS, lif->state))
+		return;
+
 	rxqcq = lif->rxqcqs[q_num];
 	for (i = 0; i < IONIC_NUM_DBG_CQ_STATS; i++) {
 		**buf = IONIC_READ_STAT64(&rxqcq->cq,
@@ -403,8 +409,33 @@ static void ionic_sw_stats_get_values(struct ionic_lif *lif, u64 **buf)
 		**buf = rxqcq->napi_stats.work_done_cntr[i];
 		(*buf)++;
 	}
+}
+
+static void ionic_sw_stats_get_values(struct ionic_lif *lif, u64 **buf)
+{
+	struct ionic_port_stats *port_stats;
+	struct ionic_lif_sw_stats lif_stats;
+	int i, q_num;
+
+	ionic_get_lif_stats(lif, &lif_stats);
+
+	for (i = 0; i < IONIC_NUM_LIF_STATS; i++) {
+		**buf = IONIC_READ_STAT64(&lif_stats, &ionic_lif_stats_desc[i]);
+		(*buf)++;
 	}
+
+	port_stats = &lif->ionic->idev.port_info->stats;
+	for (i = 0; i < IONIC_NUM_PORT_STATS; i++) {
+		**buf = IONIC_READ_STAT_LE64(port_stats,
+					     &ionic_port_stats_desc[i]);
+		(*buf)++;
 	}
+
+	for (q_num = 0; q_num < MAX_Q(lif); q_num++)
+		ionic_sw_stats_get_txq_values(lif, buf, q_num);
+
+	for (q_num = 0; q_num < MAX_Q(lif); q_num++)
+		ionic_sw_stats_get_rxq_values(lif, buf, q_num);
 }
 
 const struct ionic_stats_group_intf ionic_stats_groups[] = {

drivers/net/ethernet/pensando/ionic/ionic_txrx.c

@@ -609,6 +609,7 @@ static int ionic_tx_map_skb(struct ionic_queue *q, struct sk_buff *skb,
 			    struct ionic_desc_info *desc_info)
 {
 	struct ionic_buf_info *buf_info = desc_info->bufs;
+	struct ionic_tx_stats *stats = q_to_tx_stats(q);
 	struct device *dev = q->dev;
 	dma_addr_t dma_addr;
 	unsigned int nfrags;
@@ -616,8 +617,10 @@ static int ionic_tx_map_skb(struct ionic_queue *q, struct sk_buff *skb,
 	int frag_idx;
 
 	dma_addr = ionic_tx_map_single(q, skb->data, skb_headlen(skb));
-	if (dma_mapping_error(dev, dma_addr))
+	if (dma_mapping_error(dev, dma_addr)) {
+		stats->dma_map_err++;
 		return -EIO;
+	}
 	buf_info->dma_addr = dma_addr;
 	buf_info->len = skb_headlen(skb);
 	buf_info++;
@@ -626,8 +629,10 @@ static int ionic_tx_map_skb(struct ionic_queue *q, struct sk_buff *skb,
 	nfrags = skb_shinfo(skb)->nr_frags;
 	for (frag_idx = 0; frag_idx < nfrags; frag_idx++, frag++) {
 		dma_addr = ionic_tx_map_frag(q, frag, 0, skb_frag_size(frag));
-		if (dma_mapping_error(dev, dma_addr))
+		if (dma_mapping_error(dev, dma_addr)) {
+			stats->dma_map_err++;
 			goto dma_fail;
+		}
 		buf_info->dma_addr = dma_addr;
 		buf_info->len = skb_frag_size(frag);
 		buf_info++;