[dpdk-dev] [PATCH 7/9] pci: add a helper for device name

[David Marchand]

eal is a better place than ethdev for naming resources.
Add a helper here, and make use of it in ethdev hotplug code.

Signed-off-by: David Marchand <david.marchand at 6wind.com>
---
 lib/librte_eal/common/include/rte_pci.h | 28 ++++++++++++++++++++++++++++
 lib/librte_ether/rte_ethdev.c           | 22 ++--------------------
 2 files changed, 30 insertions(+), 20 deletions(-)

diff --git a/lib/librte_eal/common/include/rte_pci.h b/lib/librte_eal/common/include/rte_pci.h
index 334c12e..9edd5f5 100644
--- a/lib/librte_eal/common/include/rte_pci.h
+++ b/lib/librte_eal/common/include/rte_pci.h
@@ -309,6 +309,34 @@ eal_parse_pci_DomBDF(const char *input, struct rte_pci_addr *dev_addr)
 }
 #undef GET_PCIADDR_FIELD
 
+/**
+ * Utility function to write a pci device name, this device name can later be
+ * used to retrieve the corresponding rte_pci_addr using above functions.
+ *
+ * @param addr
+ *	The PCI Bus-Device-Function address
+ * @param output
+ *	The output buffer string
+ * @param size
+ *	The output buffer size
+ * @return
+ *  0 on success, negative on error.
+ */
+static inline int
+eal_pci_device_name(const struct rte_pci_addr *addr,
+		    char *output, int size)
+{
+	int ret;
+
+	ret = snprintf(output, size, PCI_PRI_FMT,
+		       addr->domain, addr->bus,
+		       addr->devid, addr->function);
+	if (ret < 0 || ret >= size)
+		return -1;
+
+	return 0;
+}
+
 /* Compare two PCI device addresses. */
 /**
  * Utility function to compare two PCI device addresses.
diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index 17e4f4d..5ba7479 100644
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -214,20 +214,6 @@ rte_eth_dev_allocate(const char *name, enum rte_eth_dev_type type)
 	return eth_dev;
 }
 
-static int
-rte_eth_dev_create_unique_device_name(char *name, size_t size,
-		struct rte_pci_device *pci_dev)
-{
-	int ret;
-
-	ret = snprintf(name, size, "%d:%d.%d",
-			pci_dev->addr.bus, pci_dev->addr.devid,
-			pci_dev->addr.function);
-	if (ret < 0)
-		return ret;
-	return 0;
-}
-
 int
 rte_eth_dev_release_port(struct rte_eth_dev *eth_dev)
 {
@@ -251,9 +237,7 @@ rte_eth_dev_pci_probe(struct rte_pci_driver *pci_drv,
 
 	eth_drv = (struct eth_driver *)pci_drv;
 
-	/* Create unique Ethernet device name using PCI address */
-	rte_eth_dev_create_unique_device_name(ethdev_name,
-			sizeof(ethdev_name), pci_dev);
+	eal_pci_device_name(&pci_dev->addr, ethdev_name, sizeof(ethdev_name));
 
 	eth_dev = rte_eth_dev_allocate(ethdev_name, RTE_ETH_DEV_PCI);
 	if (eth_dev == NULL)
@@ -304,9 +288,7 @@ rte_eth_dev_pci_remove(struct rte_pci_device *pci_dev)
 	if (pci_dev == NULL)
 		return -EINVAL;
 
-	/* Create unique Ethernet device name using PCI address */
-	rte_eth_dev_create_unique_device_name(ethdev_name,
-			sizeof(ethdev_name), pci_dev);
+	eal_pci_device_name(&pci_dev->addr, ethdev_name, sizeof(ethdev_name));
 
 	eth_dev = rte_eth_dev_allocated(ethdev_name);
 	if (eth_dev == NULL)
-- 
1.9.1