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Date:   Wed,  7 Apr 2021 16:20:00 -0700
From:   Shannon Nelson <snelson@...sando.io>
To:     netdev@...r.kernel.org, davem@...emloft.net, kuba@...nel.org,
        richardcochran@...il.com
Cc:     drivers@...sando.io, Shannon Nelson <snelson@...sando.io>
Subject: [PATCH net-next 7/8] ionic: add ts_config replay

Split the call into ionic_lif_hwstamp_set() to have two
separate interfaces, one from the ioctl() for changing the
configuration and one for replaying the current configuration
after a FW RESET.

Signed-off-by: Shannon Nelson <snelson@...sando.io>
---
 .../net/ethernet/pensando/ionic/ionic_lif.c   |  2 +-
 .../net/ethernet/pensando/ionic/ionic_lif.h   |  6 ++
 .../net/ethernet/pensando/ionic/ionic_phc.c   | 84 ++++++++++++-------
 3 files changed, 60 insertions(+), 32 deletions(-)

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_lif.c b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
index eae774c0a2d9..af3a5368529c 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_lif.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
@@ -2993,7 +2993,7 @@ static void ionic_lif_handle_fw_up(struct ionic_lif *lif)
 	dev_info(ionic->dev, "FW Up: LIFs restarted\n");
 
 	/* restore the hardware timestamping queues */
-	ionic_lif_hwstamp_set(lif, NULL);
+	ionic_lif_hwstamp_replay(lif);
 
 	return;
 
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_lif.h b/drivers/net/ethernet/pensando/ionic/ionic_lif.h
index ea3b086af179..346506f01715 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_lif.h
+++ b/drivers/net/ethernet/pensando/ionic/ionic_lif.h
@@ -302,6 +302,7 @@ int ionic_lif_identify(struct ionic *ionic, u8 lif_type,
 int ionic_lif_size(struct ionic *ionic);
 
 #if IS_ENABLED(CONFIG_PTP_1588_CLOCK)
+int ionic_lif_hwstamp_replay(struct ionic_lif *lif);
 int ionic_lif_hwstamp_set(struct ionic_lif *lif, struct ifreq *ifr);
 int ionic_lif_hwstamp_get(struct ionic_lif *lif, struct ifreq *ifr);
 ktime_t ionic_lif_phc_ktime(struct ionic_lif *lif, u64 counter);
@@ -310,6 +311,11 @@ void ionic_lif_unregister_phc(struct ionic_lif *lif);
 void ionic_lif_alloc_phc(struct ionic_lif *lif);
 void ionic_lif_free_phc(struct ionic_lif *lif);
 #else
+static inline int ionic_lif_hwstamp_replay(struct ionic_lif *lif)
+{
+	return -EOPNOTSUPP;
+}
+
 static inline int ionic_lif_hwstamp_set(struct ionic_lif *lif, struct ifreq *ifr)
 {
 	return -EOPNOTSUPP;
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_phc.c b/drivers/net/ethernet/pensando/ionic/ionic_phc.c
index 5d5da61284e7..2bb749097d9e 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_phc.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_phc.c
@@ -64,10 +64,12 @@ static u64 ionic_hwstamp_rx_filt(int config_rx_filter)
 	}
 }
 
-int ionic_lif_hwstamp_set(struct ionic_lif *lif, struct ifreq *ifr)
+static int ionic_lif_hwstamp_set_ts_config(struct ionic_lif *lif,
+					   struct hwtstamp_config *new_ts)
 {
 	struct ionic *ionic = lif->ionic;
-	struct hwtstamp_config config;
+	struct hwtstamp_config *config;
+	struct hwtstamp_config ts;
 	int tx_mode = 0;
 	u64 rx_filt = 0;
 	int err, err2;
@@ -77,18 +79,23 @@ int ionic_lif_hwstamp_set(struct ionic_lif *lif, struct ifreq *ifr)
 	if (!lif->phc || !lif->phc->ptp)
 		return -EOPNOTSUPP;
 
-	if (ifr) {
-		if (copy_from_user(&config, ifr->ifr_data, sizeof(config)))
-			return -EFAULT;
+	if (new_ts) {
+		config = new_ts;
 	} else {
-		/* if called with ifr == NULL, behave as if called with the
-		 * current ts_config from the initial cleared state.
+		/* If called with new_ts == NULL, replay the previous request
+		 * primarily for recovery after a FW_RESET.
+		 * We saved the previous configuration request info, so copy
+		 * the previous request for reference, clear the current state
+		 * to match the device's reset state, and run with it.
 		 */
-		memcpy(&config, &lif->phc->ts_config, sizeof(config));
-		memset(&lif->phc->ts_config, 0, sizeof(config));
+		config = &ts;
+		memcpy(config, &lif->phc->ts_config, sizeof(*config));
+		memset(&lif->phc->ts_config, 0, sizeof(lif->phc->ts_config));
+		lif->phc->ts_config_tx_mode = 0;
+		lif->phc->ts_config_rx_filt = 0;
 	}
 
-	tx_mode = ionic_hwstamp_tx_mode(config.tx_type);
+	tx_mode = ionic_hwstamp_tx_mode(config->tx_type);
 	if (tx_mode < 0)
 		return tx_mode;
 
@@ -96,18 +103,18 @@ int ionic_lif_hwstamp_set(struct ionic_lif *lif, struct ifreq *ifr)
 	if ((ionic->ident.lif.eth.hwstamp_tx_modes & mask) != mask)
 		return -ERANGE;
 
-	rx_filt = ionic_hwstamp_rx_filt(config.rx_filter);
-	rx_all = config.rx_filter != HWTSTAMP_FILTER_NONE && !rx_filt;
+	rx_filt = ionic_hwstamp_rx_filt(config->rx_filter);
+	rx_all = config->rx_filter != HWTSTAMP_FILTER_NONE && !rx_filt;
 
 	mask = cpu_to_le64(rx_filt);
 	if ((ionic->ident.lif.eth.hwstamp_rx_filters & mask) != mask) {
 		rx_filt = 0;
 		rx_all = true;
-		config.rx_filter = HWTSTAMP_FILTER_ALL;
+		config->rx_filter = HWTSTAMP_FILTER_ALL;
 	}
 
 	dev_dbg(ionic->dev, "config_rx_filter %d rx_filt %#llx rx_all %d\n",
-		config.rx_filter, rx_filt, rx_all);
+		config->rx_filter, rx_filt, rx_all);
 
 	mutex_lock(&lif->phc->config_lock);
 
@@ -141,15 +148,7 @@ int ionic_lif_hwstamp_set(struct ionic_lif *lif, struct ifreq *ifr)
 			goto err_rxall;
 	}
 
-	if (ifr) {
-		err = copy_to_user(ifr->ifr_data, &config, sizeof(config));
-		if (err) {
-			err = -EFAULT;
-			goto err_final;
-		}
-	}
-
-	memcpy(&lif->phc->ts_config, &config, sizeof(config));
+	memcpy(&lif->phc->ts_config, config, sizeof(*config));
 	lif->phc->ts_config_rx_filt = rx_filt;
 	lif->phc->ts_config_tx_mode = tx_mode;
 
@@ -157,14 +156,6 @@ int ionic_lif_hwstamp_set(struct ionic_lif *lif, struct ifreq *ifr)
 
 	return 0;
 
-err_final:
-	if (rx_all != (lif->phc->ts_config.rx_filter == HWTSTAMP_FILTER_ALL)) {
-		rx_all = lif->phc->ts_config.rx_filter == HWTSTAMP_FILTER_ALL;
-		err2 = ionic_lif_config_hwstamp_rxq_all(lif, rx_all);
-		if (err2)
-			dev_err(ionic->dev,
-				"Failed to revert all-rxq timestamp config: %d\n", err2);
-	}
 err_rxall:
 	if (rx_filt != lif->phc->ts_config_rx_filt) {
 		rx_filt = lif->phc->ts_config_rx_filt;
@@ -188,6 +179,37 @@ int ionic_lif_hwstamp_set(struct ionic_lif *lif, struct ifreq *ifr)
 	return err;
 }
 
+int ionic_lif_hwstamp_set(struct ionic_lif *lif, struct ifreq *ifr)
+{
+	struct hwtstamp_config config;
+	int err;
+
+	if (copy_from_user(&config, ifr->ifr_data, sizeof(config)))
+		return -EFAULT;
+
+	err = ionic_lif_hwstamp_set_ts_config(lif, &config);
+	if (err) {
+		netdev_info(lif->netdev, "hwstamp set failed: %d\n", err);
+		return err;
+	}
+
+	if (copy_to_user(ifr->ifr_data, &config, sizeof(config)))
+		return -EFAULT;
+
+	return 0;
+}
+
+int ionic_lif_hwstamp_replay(struct ionic_lif *lif)
+{
+	int err;
+
+	err = ionic_lif_hwstamp_set_ts_config(lif, NULL);
+	if (err)
+		netdev_info(lif->netdev, "hwstamp replay failed: %d\n", err);
+
+	return err;
+}
+
 int ionic_lif_hwstamp_get(struct ionic_lif *lif, struct ifreq *ifr)
 {
 	struct hwtstamp_config config;
-- 
2.17.1

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