[dpdk-dev] [PATCH 5/9] pci: use given name as generic name

[Gaetan Rivet]

The PCI device is referenced by other DPDK systems by the name of its
parameter, not by the system name.

Moreover, this name should be set once and for all, as early as
possible. This means linking the rte_devargs associated with the PCI
device during its scan, making available other metadatas used afterward
upon probing and device search for plugging.

Fixes: beec692c5157 ("eal: add name field to generic device")
Cc: stable at dpdk.org

Signed-off-by: Gaetan Rivet <gaetan.rivet at 6wind.com>
---
 lib/librte_eal/bsdapp/eal/eal_pci.c    |  4 ++--
 lib/librte_eal/common/eal_common_pci.c | 21 ++++++++++++++++-----
 lib/librte_eal/common/eal_private.h    |  5 +++++
 lib/librte_eal/linuxapp/eal/eal_pci.c  |  4 ++--
 4 files changed, 25 insertions(+), 9 deletions(-)

diff --git a/lib/librte_eal/bsdapp/eal/eal_pci.c b/lib/librte_eal/bsdapp/eal/eal_pci.c
index e321461..97a88ec 100644
--- a/lib/librte_eal/bsdapp/eal/eal_pci.c
+++ b/lib/librte_eal/bsdapp/eal/eal_pci.c
@@ -282,8 +282,7 @@ pci_scan_one(int dev_pci_fd, struct pci_conf *conf)
 	/* FreeBSD has no NUMA support (yet) */
 	dev->device.numa_node = 0;
 
-	rte_pci_device_name(&dev->addr, dev->name, sizeof(dev->name));
-	dev->device.name = dev->name;
+	pci_name_set(dev);
 
 	/* FreeBSD has only one pass through driver */
 	dev->kdrv = RTE_KDRV_NIC_UIO;
@@ -334,6 +333,7 @@ pci_scan_one(int dev_pci_fd, struct pci_conf *conf)
 			} else { /* already registered */
 				dev2->kdrv = dev->kdrv;
 				dev2->max_vfs = dev->max_vfs;
+				pci_name_set(dev2);
 				memmove(dev2->mem_resource,
 					dev->mem_resource,
 					sizeof(dev->mem_resource));
diff --git a/lib/librte_eal/common/eal_common_pci.c b/lib/librte_eal/common/eal_common_pci.c
index 76bbcc8..b100525 100644
--- a/lib/librte_eal/common/eal_common_pci.c
+++ b/lib/librte_eal/common/eal_common_pci.c
@@ -88,6 +88,21 @@ static struct rte_devargs *pci_devargs_lookup(struct rte_pci_device *dev)
 	return NULL;
 }
 
+void
+pci_name_set(struct rte_pci_device *dev)
+{
+	struct rte_devargs *devargs;
+
+	rte_pci_device_name(&dev->addr,
+			dev->name, sizeof(dev->name));
+	devargs = pci_devargs_lookup(dev);
+	dev->device.devargs = devargs;
+	if (devargs != NULL)
+		dev->device.name = dev->device.devargs->name;
+	else
+		dev->device.name = dev->name;
+}
+
 /* map a particular resource from a file */
 void *
 pci_map_resource(void *requested_addr, int fd, off_t offset, size_t size,
@@ -396,11 +411,7 @@ rte_pci_probe(void)
 	FOREACH_DEVICE_ON_PCIBUS(dev) {
 		probed++;
 
-		/* set devargs in PCI structure */
-		devargs = pci_devargs_lookup(dev);
-		if (devargs != NULL)
-			dev->device.devargs = devargs;
-
+		devargs = dev->device.devargs;
 		/* probe all or only whitelisted devices */
 		if (probe_all)
 			ret = pci_probe_all_drivers(dev);
diff --git a/lib/librte_eal/common/eal_private.h b/lib/librte_eal/common/eal_private.h
index 0836339..597d82e 100644
--- a/lib/librte_eal/common/eal_private.h
+++ b/lib/librte_eal/common/eal_private.h
@@ -113,6 +113,11 @@ struct rte_pci_driver;
 struct rte_pci_device;
 
 /**
+ * Find the name of a PCI device.
+ */
+void pci_name_set(struct rte_pci_device *dev);
+
+/**
  * Add a PCI device to the PCI Bus (append to PCI Device list). This function
  * also updates the bus references of the PCI Device (and the generic device
  * object embedded within.
diff --git a/lib/librte_eal/linuxapp/eal/eal_pci.c b/lib/librte_eal/linuxapp/eal/eal_pci.c
index 7d9e1a9..556ae2c 100644
--- a/lib/librte_eal/linuxapp/eal/eal_pci.c
+++ b/lib/librte_eal/linuxapp/eal/eal_pci.c
@@ -324,8 +324,7 @@ pci_scan_one(const char *dirname, const struct rte_pci_addr *addr)
 		dev->device.numa_node = 0;
 	}
 
-	rte_pci_device_name(addr, dev->name, sizeof(dev->name));
-	dev->device.name = dev->name;
+	pci_name_set(dev);
 
 	/* parse resources */
 	snprintf(filename, sizeof(filename), "%s/resource", dirname);
@@ -373,6 +372,7 @@ pci_scan_one(const char *dirname, const struct rte_pci_addr *addr)
 			} else { /* already registered */
 				dev2->kdrv = dev->kdrv;
 				dev2->max_vfs = dev->max_vfs;
+				pci_name_set(dev2);
 				memmove(dev2->mem_resource, dev->mem_resource,
 					sizeof(dev->mem_resource));
 				free(dev);
-- 
2.1.4