[dpdk-dev] [PATCH] pci: Add the class_id support in pci probe

[Ziye Yang]

This patch is used to add the class_id (class_code,
subclass_code, programming_interface) support for
pci_device probe. With this patch, it will be
flexible for users to probe a class of devices
by class_id.

Signed-off-by: Ziye Yang <ziye.yang at intel.com>
---
 lib/librte_eal/bsdapp/eal/eal_pci.c     | 4 ++++
 lib/librte_eal/common/eal_common_pci.c  | 3 +++
 lib/librte_eal/common/include/rte_pci.h | 8 ++++++--
 lib/librte_eal/linuxapp/eal/eal_pci.c   | 9 +++++++++
 4 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/lib/librte_eal/bsdapp/eal/eal_pci.c b/lib/librte_eal/bsdapp/eal/eal_pci.c
index 2d16d78..6fc9130 100644
--- a/lib/librte_eal/bsdapp/eal/eal_pci.c
+++ b/lib/librte_eal/bsdapp/eal/eal_pci.c
@@ -278,6 +278,10 @@ pci_scan_one(int dev_pci_fd, struct pci_conf *conf)
 	/* get subsystem_device id */
 	dev->id.subsystem_device_id = conf->pc_subdevice;
 
+	dev->id.class_id = (conf->pc_class << 16) |
+			   (conf->pc_subclass << 8) |
+			   (conf->pc_progif);
+
 	/* TODO: get max_vfs */
 	dev->max_vfs = 0;
 
diff --git a/lib/librte_eal/common/eal_common_pci.c b/lib/librte_eal/common/eal_common_pci.c
index 3cae4cb..ed792f9 100644
--- a/lib/librte_eal/common/eal_common_pci.c
+++ b/lib/librte_eal/common/eal_common_pci.c
@@ -162,6 +162,9 @@ rte_eal_pci_probe_one_driver(struct rte_pci_driver *dr, struct rte_pci_device *d
 		if (id_table->subsystem_device_id != dev->id.subsystem_device_id &&
 				id_table->subsystem_device_id != PCI_ANY_ID)
 			continue;
+		if (id_table->class_id != dev->id.class_id &&
+				id_table->class_id != CLASS_ANY_ID)
+			continue;
 
 		struct rte_pci_addr *loc = &dev->addr;
 
diff --git a/lib/librte_eal/common/include/rte_pci.h b/lib/librte_eal/common/include/rte_pci.h
index 8fa2712..fbb3ad9 100644
--- a/lib/librte_eal/common/include/rte_pci.h
+++ b/lib/librte_eal/common/include/rte_pci.h
@@ -129,6 +129,7 @@ struct rte_pci_id {
 	uint16_t device_id;           /**< Device ID or PCI_ANY_ID. */
 	uint16_t subsystem_vendor_id; /**< Subsystem vendor ID or PCI_ANY_ID. */
 	uint16_t subsystem_device_id; /**< Subsystem device ID or PCI_ANY_ID. */
+	uint32_t class_id;           /**< Class ID (class, subclass, pi) or CLASS_ANY_ID. */
 };
 
 /**
@@ -170,6 +171,7 @@ struct rte_pci_device {
 
 /** Any PCI device identifier (vendor, device, ...) */
 #define PCI_ANY_ID (0xffff)
+#define CLASS_ANY_ID (0xffffff)
 
 #ifdef __cplusplus
 /** C++ macro used to help building up tables of device IDs */
@@ -177,14 +179,16 @@ struct rte_pci_device {
 	(vend),                   \
 	(dev),                    \
 	PCI_ANY_ID,               \
-	PCI_ANY_ID
+	PCI_ANY_ID,               \
+	CLASS_ANY_ID
 #else
 /** Macro used to help building up tables of device IDs */
 #define RTE_PCI_DEVICE(vend, dev)          \
 	.vendor_id = (vend),               \
 	.device_id = (dev),                \
 	.subsystem_vendor_id = PCI_ANY_ID, \
-	.subsystem_device_id = PCI_ANY_ID
+	.subsystem_device_id = PCI_ANY_ID, \
+	.class_id = CLASS_ANY_ID
 #endif
 
 struct rte_pci_driver;
diff --git a/lib/librte_eal/linuxapp/eal/eal_pci.c b/lib/librte_eal/linuxapp/eal/eal_pci.c
index bdc08a0..3a1617c 100644
--- a/lib/librte_eal/linuxapp/eal/eal_pci.c
+++ b/lib/librte_eal/linuxapp/eal/eal_pci.c
@@ -306,6 +306,15 @@ pci_scan_one(const char *dirname, uint16_t domain, uint8_t bus,
 	}
 	dev->id.subsystem_device_id = (uint16_t)tmp;
 
+	/* get class_id */
+	snprintf(filename, sizeof(filename), "%s/class",
+		 dirname);
+	if (eal_parse_sysfs_value(filename, &tmp) < 0) {
+		free(dev);
+		return -1;
+	}
+	dev->id.class_id = (uint32_t)tmp && CLASS_ANY_ID;
+
 	/* get max_vfs */
 	dev->max_vfs = 0;
 	snprintf(filename, sizeof(filename), "%s/max_vfs", dirname);
-- 
1.9.3