[dpdk-dev] [PATCH v1] Change rte_eal_vdev_init to update port_id

[Ravi Kerur <rkerur@gmail.com>]

Changes include
   > Modify rte_eal_vdev_init to return allocated port_id
   > Modify rte_eal_probe_one to return allocated port_id

2. Removed following functions
   > rte_eth_dev_save and
   > rte_eth_dev_get_changed_port

3. Added 2 new functions
   > rte_eth_dev_get_port_by_name
   > rte_eth_dev_get_port_by_addr

4. Fix return error(ENOMEM) in function rte_pmd_mpipe_devinit

Compiled on Linux for following targets
   > x86_64-native-linuxapp-gcc
   > x86_64-native-linuxapp-clang
   > x86_x32-native-linuxapp-gcc

Compiled on FreeBSD for following targets
   > x86_64-native-bsdapp-clang
   > x86_64-native-bsdapp-gcc

Tested on Linux/FreeBSD:
   > port attach eth_null
   > port start all
   > port stop all
   > port close all
   > port detach 0
   > port attach eth_null
   > port start all
   > port stop all
   > port close all
   > port detach 0

Successful run of checkpatch.pl on the diffs

Successful validate_abi on Linux for following targets

   > x86_64-native-linuxapp-gcc
   > x86_64-native-linuxapp-clang

Signed-off-by: Ravi Kerur <rkerur@gmail.com>
---
 drivers/net/enic/enic_ethdev.c          |   2 +-
 drivers/net/mpipe/mpipe_tilegx.c        |   1 +
 lib/librte_eal/common/eal_common_dev.c  |  14 ++--
 lib/librte_eal/common/eal_common_pci.c  |   6 +-
 lib/librte_eal/common/include/rte_dev.h |  36 +++++++++-
 lib/librte_eal/common/include/rte_pci.h |   4 +-
 lib/librte_ether/rte_ethdev.c           | 119 +++++++++++++++++---------------
 lib/librte_ether/rte_ether_version.map  |   2 +
 8 files changed, 118 insertions(+), 66 deletions(-)

diff --git a/drivers/net/enic/enic_ethdev.c b/drivers/net/enic/enic_ethdev.c
index 8280cea..472ef5a 100644
--- a/drivers/net/enic/enic_ethdev.c
+++ b/drivers/net/enic/enic_ethdev.c
@@ -36,8 +36,8 @@
 #include <stdio.h>
 #include <stdint.h>
 
-#include <rte_dev.h>
 #include <rte_pci.h>
+#include <rte_dev.h>
 #include <rte_ethdev.h>
 #include <rte_string_fns.h>
 
diff --git a/drivers/net/mpipe/mpipe_tilegx.c b/drivers/net/mpipe/mpipe_tilegx.c
index 743feef..6e3e304 100644
--- a/drivers/net/mpipe/mpipe_tilegx.c
+++ b/drivers/net/mpipe/mpipe_tilegx.c
@@ -1582,6 +1582,7 @@ rte_pmd_mpipe_devinit(const char *ifname,
 	if (!eth_dev) {
 		RTE_LOG(ERR, PMD, "%s: Failed to allocate device.\n", ifname);
 		rte_free(priv);
+		return -ENOMEM;
 	}
 
 	RTE_LOG(INFO, PMD, "%s: Initialized mpipe device"
diff --git a/lib/librte_eal/common/eal_common_dev.c b/lib/librte_eal/common/eal_common_dev.c
index 4089d66..82d5693 100644
--- a/lib/librte_eal/common/eal_common_dev.c
+++ b/lib/librte_eal/common/eal_common_dev.c
@@ -37,6 +37,7 @@
 #include <inttypes.h>
 #include <sys/queue.h>
 
+#include <rte_pci.h>
 #include <rte_dev.h>
 #include <rte_devargs.h>
 #include <rte_debug.h>
@@ -64,7 +65,7 @@ rte_eal_driver_unregister(struct rte_driver *driver)
 }
 
 int
-rte_eal_vdev_init(const char *name, const char *args)
+rte_eal_vdev_init(const char *name, const char *args, uint8_t *port_id)
 {
 	struct rte_driver *driver;
 
@@ -81,8 +82,12 @@ rte_eal_vdev_init(const char *name, const char *args)
 		 * will be "eth_pcap", but "name" will be "eth_pcapN".
 		 * So use strncmp to compare.
 		 */
-		if (!strncmp(driver->name, name, strlen(driver->name)))
-			return driver->init(name, args);
+		if (!strncmp(driver->name, name, strlen(driver->name))) {
+			if (!driver->init(name, args))
+				return rte_eth_dev_get_port_by_name(
+						name, port_id);
+		}
+
 	}
 
 	RTE_LOG(ERR, EAL, "no driver found for %s\n", name);
@@ -94,6 +99,7 @@ rte_eal_dev_init(void)
 {
 	struct rte_devargs *devargs;
 	struct rte_driver *driver;
+	uint8_t port_id;
 
 	/*
 	 * Note that the dev_driver_list is populated here
@@ -108,7 +114,7 @@ rte_eal_dev_init(void)
 			continue;
 
 		if (rte_eal_vdev_init(devargs->virtual.drv_name,
-					devargs->args)) {
+					devargs->args, &port_id)) {
 			RTE_LOG(ERR, EAL, "failed to initialize %s device\n",
 					devargs->virtual.drv_name);
 			return -1;
diff --git a/lib/librte_eal/common/eal_common_pci.c b/lib/librte_eal/common/eal_common_pci.c
index 16e8629..3d97892 100644
--- a/lib/librte_eal/common/eal_common_pci.c
+++ b/lib/librte_eal/common/eal_common_pci.c
@@ -79,6 +79,7 @@
 #include <rte_string_fns.h>
 #include <rte_common.h>
 #include <rte_devargs.h>
+#include <rte_dev.h>
 
 #include "eal_private.h"
 
@@ -322,7 +323,7 @@ pci_detach_all_drivers(struct rte_pci_device *dev)
  * the driver of the devive.
  */
 int
-rte_eal_pci_probe_one(const struct rte_pci_addr *addr)
+rte_eal_pci_probe_one(const struct rte_pci_addr *addr, uint8_t *port_id)
 {
 	struct rte_pci_device *dev = NULL;
 	int ret = 0;
@@ -337,7 +338,8 @@ rte_eal_pci_probe_one(const struct rte_pci_addr *addr)
 		ret = pci_probe_all_drivers(dev);
 		if (ret < 0)
 			goto err_return;
-		return 0;
+
+		return rte_eth_dev_get_port_by_addr(addr, port_id);
 	}
 	return -1;
 
diff --git a/lib/librte_eal/common/include/rte_dev.h b/lib/librte_eal/common/include/rte_dev.h
index f601d21..cd4635f 100644
--- a/lib/librte_eal/common/include/rte_dev.h
+++ b/lib/librte_eal/common/include/rte_dev.h
@@ -110,10 +110,12 @@ int rte_eal_dev_init(void);
  *   The pointer to a driver name to be initialized.
  * @param args
  *   The pointer to arguments used by driver initialization.
+ * @param port_id
+ *   The port_id associated with the driver after initialization.
  * @return
  *  0 on success, negative on error
  */
-int rte_eal_vdev_init(const char *name, const char *args);
+int rte_eal_vdev_init(const char *name, const char *args, uint8_t *port_id);
 
 /**
  * Uninitalize a driver specified by name.
@@ -125,6 +127,38 @@ int rte_eal_vdev_init(const char *name, const char *args);
  */
 int rte_eal_vdev_uninit(const char *name);
 
+/**
+ * Given name, return port_id associated with the device.
+ *
+ * @param name
+ *   Name associated with device.
+ * @param port_id
+ *   The port identifier of the device.
+ *
+ * @return
+ *   - 0: Success.
+ *   - -EINVAL: NULL pointer.
+ *   - -ENODEV: No matching device.
+ */
+extern int
+rte_eth_dev_get_port_by_name(const char *name, uint8_t *port_id);
+
+/**
+ * Given pci_addr, return port_id associated with the device.
+ *
+ * @param addr
+ *   PCI addr associated with device.
+ * @param port_id
+ *   The port identifier of the device.
+ *
+ * @return
+ *   - 0: Success.
+ *   - -EINVAL: NULL pointer.
+ *   - -ENODEV: No matching device.
+ */
+extern int
+rte_eth_dev_get_port_by_addr(const struct rte_pci_addr *addr, uint8_t *port_id);
+
 #define PMD_REGISTER_DRIVER(d)\
 void devinitfn_ ##d(void);\
 void __attribute__((constructor, used)) devinitfn_ ##d(void)\
diff --git a/lib/librte_eal/common/include/rte_pci.h b/lib/librte_eal/common/include/rte_pci.h
index 3fb2d3a..91ad23f 100644
--- a/lib/librte_eal/common/include/rte_pci.h
+++ b/lib/librte_eal/common/include/rte_pci.h
@@ -406,11 +406,13 @@ void pci_unmap_resource(void *requested_addr, size_t size);
  *
  * @param addr
  *	The PCI Bus-Device-Function address to probe.
+ * @param port_id
+ *	Port-id associated with PCI device address
  * @return
  *   - 0 on success.
  *   - Negative on error.
  */
-int rte_eal_pci_probe_one(const struct rte_pci_addr *addr);
+int rte_eal_pci_probe_one(const struct rte_pci_addr *addr, uint8_t *port_id);
 
 /**
  * Close the single PCI device.
diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index 5fe1906..355d709 100644
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -442,32 +442,6 @@ rte_eth_dev_get_device_type(uint8_t port_id)
 }
 
 static int
-rte_eth_dev_save(struct rte_eth_dev *devs, size_t size)
-{
-	if ((devs == NULL) ||
-	    (size != sizeof(struct rte_eth_dev) * RTE_MAX_ETHPORTS))
-		return -EINVAL;
-
-	/* save current rte_eth_devices */
-	memcpy(devs, rte_eth_devices, size);
-	return 0;
-}
-
-static int
-rte_eth_dev_get_changed_port(struct rte_eth_dev *devs, uint8_t *port_id)
-{
-	if ((devs == NULL) || (port_id == NULL))
-		return -EINVAL;
-
-	/* check which port was attached or detached */
-	for (*port_id = 0; *port_id < RTE_MAX_ETHPORTS; (*port_id)++, devs++) {
-		if (rte_eth_devices[*port_id].attached ^ devs->attached)
-			return 0;
-	}
-	return -ENODEV;
-}
-
-static int
 rte_eth_dev_get_addr_by_port(uint8_t port_id, struct rte_pci_addr *addr)
 {
 	VALID_PORTID_OR_ERR_RET(port_id, -EINVAL);
@@ -530,30 +504,16 @@ rte_eth_dev_is_detachable(uint8_t port_id)
 static int
 rte_eth_dev_attach_pdev(struct rte_pci_addr *addr, uint8_t *port_id)
 {
-	uint8_t new_port_id;
-	struct rte_eth_dev devs[RTE_MAX_ETHPORTS];
-
 	if ((addr == NULL) || (port_id == NULL))
 		goto err;
 
-	/* save current port status */
-	if (rte_eth_dev_save(devs, sizeof(devs)))
-		goto err;
 	/* re-construct pci_device_list */
 	if (rte_eal_pci_scan())
 		goto err;
-	/* invoke probe func of the driver can handle the new device.
-	 * TODO:
-	 * rte_eal_pci_probe_one() should return port_id.
-	 * And rte_eth_dev_save() and rte_eth_dev_get_changed_port()
-	 * should be removed. */
-	if (rte_eal_pci_probe_one(addr))
-		goto err;
-	/* get port_id enabled by above procedures */
-	if (rte_eth_dev_get_changed_port(devs, &new_port_id))
+	/* Invoke probe func of the driver can handle the new device. */
+	if (rte_eal_pci_probe_one(addr, port_id))
 		goto err;
 
-	*port_id = new_port_id;
 	return 0;
 err:
 	RTE_LOG(ERR, EAL, "Driver, cannot attach the device\n");
@@ -600,8 +560,6 @@ static int
 rte_eth_dev_attach_vdev(const char *vdevargs, uint8_t *port_id)
 {
 	char *name = NULL, *args = NULL;
-	uint8_t new_port_id;
-	struct rte_eth_dev devs[RTE_MAX_ETHPORTS];
 	int ret = -1;
 
 	if ((vdevargs == NULL) || (port_id == NULL))
@@ -611,22 +569,15 @@ rte_eth_dev_attach_vdev(const char *vdevargs, uint8_t *port_id)
 	if (rte_eal_parse_devargs_str(vdevargs, &name, &args))
 		goto end;
 
-	/* save current port status */
-	if (rte_eth_dev_save(devs, sizeof(devs)))
-		goto end;
 	/* walk around dev_driver_list to find the driver of the device,
-	 * then invoke probe function o the driver.
-	 * TODO:
-	 * rte_eal_vdev_init() should return port_id,
-	 * And rte_eth_dev_save() and rte_eth_dev_get_changed_port()
-	 * should be removed. */
-	if (rte_eal_vdev_init(name, args))
-		goto end;
-	/* get port_id enabled by above procedures */
-	if (rte_eth_dev_get_changed_port(devs, &new_port_id))
+	 * then invoke probe function of the driver.
+	 * rte_eal_vdev_init() updates port_id allocated after
+	 * initialization.
+	 */
+	if (rte_eal_vdev_init(name, args, port_id))
 		goto end;
+
 	ret = 0;
-	*port_id = new_port_id;
 end:
 	if (name)
 		free(name);
@@ -3610,3 +3561,57 @@ rte_eth_dev_set_eeprom(uint8_t port_id, struct rte_dev_eeprom_info *info)
 	FUNC_PTR_OR_ERR_RET(*dev->dev_ops->set_eeprom, -ENOTSUP);
 	return (*dev->dev_ops->set_eeprom)(dev, info);
 }
+
+int
+rte_eth_dev_get_port_by_name(const char *name, uint8_t *port_id)
+{
+	int i;
+
+	if (name == NULL || port_id == NULL) {
+		PMD_DEBUG_TRACE("Null pointer is specified\n");
+		return -EINVAL;
+	}
+
+	*port_id = RTE_MAX_ETHPORTS;
+
+	for (i = 0; i < RTE_MAX_ETHPORTS; i++) {
+
+		if (!strncmp(name,
+			rte_eth_dev_data[i].name, strlen(name))) {
+
+			*port_id = i;
+			return 0;
+		}
+	}
+	return -ENODEV;
+}
+
+int
+rte_eth_dev_get_port_by_addr(const struct rte_pci_addr *addr, uint8_t *port_id)
+{
+	int i;
+	struct rte_pci_device *pci_dev = NULL;
+
+	if (addr == NULL || port_id == NULL) {
+		PMD_DEBUG_TRACE("Null pointer is specified\n");
+		return -EINVAL;
+	}
+
+	*port_id = RTE_MAX_ETHPORTS;
+
+	for (i = 0; i < RTE_MAX_ETHPORTS; i++) {
+
+		pci_dev = rte_eth_devices[i].pci_dev;
+
+		if (pci_dev != NULL &&
+			pci_dev->addr.domain == addr->domain &&
+			pci_dev->addr.bus == addr->bus &&
+			pci_dev->addr.devid == addr->devid &&
+			pci_dev->addr.function == addr->function) {
+
+			*port_id = i;
+			return 0;
+		}
+	}
+	return -ENODEV;
+}
diff --git a/lib/librte_ether/rte_ether_version.map b/lib/librte_ether/rte_ether_version.map
index 8345a6c..3d5cb23 100644
--- a/lib/librte_ether/rte_ether_version.map
+++ b/lib/librte_ether/rte_ether_version.map
@@ -125,5 +125,7 @@ DPDK_2.1 {
 	rte_eth_timesync_enable;
 	rte_eth_timesync_read_rx_timestamp;
 	rte_eth_timesync_read_tx_timestamp;
+	rte_eth_dev_get_port_by_name;
+	rte_eth_dev_get_port_by_addr;
 
 } DPDK_2.0;
-- 
1.9.1