From: Moti Haimovsky <motih@mellanox.com>
Date: Mon, 29 Jan 2018 08:34:37 +0000 (+0200)
Subject: net/mlx4: fix removal detection of stopped port
X-Git-Url: http://git.droids-corp.org/?p=dpdk.git;a=commitdiff_plain;h=fc1b5ec522ee92f303cb74e683a5efe477cf9b56

net/mlx4: fix removal detection of stopped port

In failsafe device start can be called for ports/devices that
had been plugged out.
The mlx4 PMD detects device removal by listening to the device RMV
events, when the mlx4 port is being stopped, the PMD no longer
listens to these events causing the PMD to stop detecting device
removals.
This patch fixes this issue by moving installation of the interrupt
handler to device configuration, and toggle only the Rx-queue
interrupts on start/stop.

Fixes: a6e8b01c3c26 ("net/mlx4: compact interrupt functions")
Cc: stable@dpdk.org

Signed-off-by: Moti Haimovsky <motih@mellanox.com>
Acked-by: Shahaf Shuler <shahafs@mellanox.com>
---

diff --git a/drivers/net/mlx4/mlx4.c b/drivers/net/mlx4/mlx4.c
index 952dae08a3..680eca7bcc 100644
--- a/drivers/net/mlx4/mlx4.c
+++ b/drivers/net/mlx4/mlx4.c
@@ -108,7 +108,13 @@ mlx4_dev_configure(struct rte_eth_dev *dev)
 		      " flow error type %d, cause %p, message: %s",
 		      -ret, strerror(-ret), error.type, error.cause,
 		      error.message ? error.message : "(unspecified)");
+		goto exit;
 	}
+	ret = mlx4_intr_install(priv);
+	if (ret)
+		ERROR("%p: interrupt handler installation failed",
+		      (void *)dev);
+exit:
 	return ret;
 }
 
@@ -141,7 +147,7 @@ mlx4_dev_start(struct rte_eth_dev *dev)
 		      (void *)dev, strerror(-ret));
 		goto err;
 	}
-	ret = mlx4_intr_install(priv);
+	ret = mlx4_rxq_intr_enable(priv);
 	if (ret) {
 		ERROR("%p: interrupt handler installation failed",
 		     (void *)dev);
@@ -187,7 +193,7 @@ mlx4_dev_stop(struct rte_eth_dev *dev)
 	dev->rx_pkt_burst = mlx4_rx_burst_removed;
 	rte_wmb();
 	mlx4_flow_sync(priv, NULL);
-	mlx4_intr_uninstall(priv);
+	mlx4_rxq_intr_disable(priv);
 	mlx4_rss_deinit(priv);
 }
 
diff --git a/drivers/net/mlx4/mlx4.h b/drivers/net/mlx4/mlx4.h
index 30a544f9ae..d65879f523 100644
--- a/drivers/net/mlx4/mlx4.h
+++ b/drivers/net/mlx4/mlx4.h
@@ -177,6 +177,8 @@ int mlx4_is_removed(struct rte_eth_dev *dev);
 
 int mlx4_intr_uninstall(struct priv *priv);
 int mlx4_intr_install(struct priv *priv);
+int mlx4_rxq_intr_enable(struct priv *priv);
+void mlx4_rxq_intr_disable(struct priv *priv);
 int mlx4_rx_intr_disable(struct rte_eth_dev *dev, uint16_t idx);
 int mlx4_rx_intr_enable(struct rte_eth_dev *dev, uint16_t idx);
 
diff --git a/drivers/net/mlx4/mlx4_intr.c b/drivers/net/mlx4/mlx4_intr.c
index 2ff72188a7..e52294957c 100644
--- a/drivers/net/mlx4/mlx4_intr.c
+++ b/drivers/net/mlx4/mlx4_intr.c
@@ -291,7 +291,7 @@ mlx4_intr_uninstall(struct priv *priv)
 	}
 	rte_eal_alarm_cancel((void (*)(void *))mlx4_link_status_alarm, priv);
 	priv->intr_alarm = 0;
-	mlx4_rx_intr_vec_disable(priv);
+	mlx4_rxq_intr_disable(priv);
 	rte_errno = err;
 	return 0;
 }
@@ -313,8 +313,6 @@ mlx4_intr_install(struct priv *priv)
 	int rc;
 
 	mlx4_intr_uninstall(priv);
-	if (intr_conf->rxq && mlx4_rx_intr_vec_enable(priv) < 0)
-		goto error;
 	if (intr_conf->lsc | intr_conf->rmv) {
 		priv->intr_handle.fd = priv->ctx->async_fd;
 		rc = rte_intr_callback_register(&priv->intr_handle,
@@ -395,3 +393,40 @@ mlx4_rx_intr_enable(struct rte_eth_dev *dev, uint16_t idx)
 	}
 	return -ret;
 }
+
+/**
+ * Enable datapath interrupts.
+ *
+ * @param priv
+ *   Pointer to private structure.
+ *
+ * @return
+ *   0 on success, negative errno value otherwise and rte_errno is set.
+ */
+int
+mlx4_rxq_intr_enable(struct priv *priv)
+{
+	const struct rte_intr_conf *const intr_conf =
+		&priv->dev->data->dev_conf.intr_conf;
+
+	if (intr_conf->rxq && mlx4_rx_intr_vec_enable(priv) < 0)
+		goto error;
+	return 0;
+error:
+	return -rte_errno;
+}
+
+/**
+ * Disable datapath interrupts, keeping other interrupts intact.
+ *
+ * @param priv
+ *   Pointer to private structure.
+ */
+void
+mlx4_rxq_intr_disable(struct priv *priv)
+{
+	int err = rte_errno; /* Make sure rte_errno remains unchanged. */
+
+	mlx4_rx_intr_vec_disable(priv);
+	rte_errno = err;
+}