diff mbox

[dpdk-dev,RFC,v2,02/28] ethdev: Remove assumption that port will not be detached

Message ID 1415072748-31937-3-git-send-email-mukawa@igel.co.jp (mailing list archive)
State RFC, archived
Headers show

Commit Message

Tetsuya Mukawa Nov. 4, 2014, 3:45 a.m. UTC
To remove assumption, do like followings.

- Add 'attached' member to rte_eth_dev structure.
  This member is used for indicating the port is attached, or not.
- Add rte_eth_dev_allocate_new_port().
  This function is used for allocating new port.

Signed-off-by: Tetsuya Mukawa <mukawa@igel.co.jp>
---
 lib/librte_ether/rte_ethdev.c | 24 ++++++++++++++++++++----
 lib/librte_ether/rte_ethdev.h |  5 +++++
 2 files changed, 25 insertions(+), 4 deletions(-)
diff mbox

Patch

diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index ff1c769..e37a25a 100644
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -208,12 +208,25 @@  rte_eth_dev_allocated(const char *name)
 	return NULL;
 }
 
+static uint8_t
+rte_eth_dev_allocate_new_port(void)
+{
+	unsigned i;
+
+	for (i = 0; i < RTE_MAX_ETHPORTS; i++)
+		if (!rte_eth_devices[i].attached)
+			return i;
+	return RTE_MAX_ETHPORTS;
+}
+
 struct rte_eth_dev *
 rte_eth_dev_allocate(const char *name)
 {
+	uint8_t port_id;
 	struct rte_eth_dev *eth_dev;
 
-	if (nb_ports == RTE_MAX_ETHPORTS) {
+	port_id = rte_eth_dev_allocate_new_port();
+	if (port_id == RTE_MAX_ETHPORTS) {
 		PMD_DEBUG_TRACE("Reached maximum number of Ethernet ports\n");
 		return NULL;
 	}
@@ -226,10 +239,12 @@  rte_eth_dev_allocate(const char *name)
 		return NULL;
 	}
 
-	eth_dev = &rte_eth_devices[nb_ports];
-	eth_dev->data = &rte_eth_dev_data[nb_ports];
+	eth_dev = &rte_eth_devices[port_id];
+	eth_dev->data = &rte_eth_dev_data[port_id];
 	snprintf(eth_dev->data->name, sizeof(eth_dev->data->name), "%s", name);
-	eth_dev->data->port_id = nb_ports++;
+	eth_dev->data->port_id = port_id;
+	eth_dev->attached = 1;
+	nb_ports++;
 	return eth_dev;
 }
 
@@ -283,6 +298,7 @@  rte_eth_dev_init(struct rte_pci_driver *pci_drv,
 			(unsigned) pci_dev->id.device_id);
 	if (rte_eal_process_type() == RTE_PROC_PRIMARY)
 		rte_free(eth_dev->data->dev_private);
+	eth_dev->attached = 0;
 	nb_ports--;
 	return diag;
 }
diff --git a/lib/librte_ether/rte_ethdev.h b/lib/librte_ether/rte_ethdev.h
index 8bf274d..5d3956a 100644
--- a/lib/librte_ether/rte_ethdev.h
+++ b/lib/librte_ether/rte_ethdev.h
@@ -1534,6 +1534,7 @@  struct eth_dev_ops {
  * process, while the actual configuration data for the device is shared.
  */
 struct rte_eth_dev {
+	uint8_t attached; /**< Flag indicating the port is attached */
 	eth_rx_burst_t rx_pkt_burst; /**< Pointer to PMD receive function. */
 	eth_tx_burst_t tx_pkt_burst; /**< Pointer to PMD transmit function. */
 	struct rte_eth_dev_data *data;  /**< Pointer to device data */
@@ -1606,6 +1607,10 @@  extern struct rte_eth_dev rte_eth_devices[];
  * initialized by the [matching] Ethernet driver during the PCI probing phase.
  * All devices whose port identifier is in the range
  * [0,  rte_eth_dev_count() - 1] can be operated on by network applications.
+ * immediately after invoking rte_eal_init().
+ * If the application unplugs a port using hotplug function, The enabled port
+ * numbers may be noncontiguous. In the case, the applications need to manage
+ * enabled port by themselves.
  *
  * @return
  *   - The total number of usable Ethernet devices.