[v5,1/6] drivers: add generic API to find PCI extended cap
diff mbox series

Message ID 20200730144221.29051-2-manishc@marvell.com
State New
Delegated to: Jerin Jacob
Headers show
Series
  • qede: SR-IOV PF driver support
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Context Check Description
ci/iol-mellanox-Performance success Performance Testing PASS
ci/iol-testing success Testing PASS
ci/iol-intel-Performance success Performance Testing PASS
ci/Intel-compilation success Compilation OK
ci/checkpatch success coding style OK

Commit Message

Manish Chopra July 30, 2020, 2:42 p.m. UTC
By adding generic API, this patch removes individual
functions/defines implemented by drivers to find extended
PCI capabilities.

Signed-off-by: Manish Chopra <manishc@marvell.com>
Signed-off-by: Igor Russkikh <irusskikh@marvell.com>
---
 drivers/bus/pci/pci_common.c               | 43 ++++++++++++++++++
 drivers/bus/pci/rte_bus_pci.h              | 20 +++++++++
 drivers/bus/pci/rte_bus_pci_version.map    |  6 +++
 drivers/net/ice/ice_ethdev.c               | 51 +---------------------
 drivers/net/nfp/nfpcore/nfp_cpp_pcie_ops.c | 48 +-------------------
 drivers/raw/ifpga/ifpga_rawdev.c           | 17 +++-----
 lib/librte_pci/rte_pci.h                   | 16 +++++++
 7 files changed, 95 insertions(+), 106 deletions(-)

Comments

Nithin Dabilpuram Aug. 7, 2020, 5:46 p.m. UTC | #1
On Thu, Jul 30, 2020 at 07:42:16AM -0700, Manish Chopra wrote:
> By adding generic API, this patch removes individual
> functions/defines implemented by drivers to find extended
> PCI capabilities.
> 
> Signed-off-by: Manish Chopra <manishc@marvell.com>
> Signed-off-by: Igor Russkikh <irusskikh@marvell.com>
> ---
>  drivers/bus/pci/pci_common.c               | 43 ++++++++++++++++++
>  drivers/bus/pci/rte_bus_pci.h              | 20 +++++++++
>  drivers/bus/pci/rte_bus_pci_version.map    |  6 +++
>  drivers/net/ice/ice_ethdev.c               | 51 +---------------------
>  drivers/net/nfp/nfpcore/nfp_cpp_pcie_ops.c | 48 +-------------------
>  drivers/raw/ifpga/ifpga_rawdev.c           | 17 +++-----
>  lib/librte_pci/rte_pci.h                   | 16 +++++++
>  7 files changed, 95 insertions(+), 106 deletions(-)
> 
> diff --git a/drivers/bus/pci/pci_common.c b/drivers/bus/pci/pci_common.c
> index a8e5fd52c..98c1f8155 100644
> --- a/drivers/bus/pci/pci_common.c
> +++ b/drivers/bus/pci/pci_common.c
> @@ -665,6 +665,49 @@ rte_pci_get_iommu_class(void)
>  	return iova_mode;
>  }
>  
> +off_t
> +rte_pci_find_next_ext_capability(struct rte_pci_device *dev, uint32_t cap)
> +{

Shouldn't it be named rte_pci_find_ext_capability() as it doesn't take start
position from where to search ?

> +	off_t offset = RTE_PCI_CFG_SPACE_SIZE;
> +	uint32_t header;
> +	int ttl;
> +
> +	/* minimum 8 bytes per capability */
> +	ttl = (RTE_PCI_CFG_SPACE_EXP_SIZE - RTE_PCI_CFG_SPACE_SIZE) / 8;
> +
> +	if (rte_pci_read_config(dev, &header, 4, offset) < 0) {
> +		RTE_LOG(ERR, EAL, "error in reading extended capabilities\n");
> +		return -1;
> +	}
> +
> +	/*
> +	 * If we have no capabilities, this is indicated by cap ID,
> +	 * cap version and next pointer all being 0.
> +	 */
> +	if (header == 0)
> +		return 0;
> +
> +	while (ttl != 0) {
> +		if (RTE_PCI_EXT_CAP_ID(header) == cap)
> +			return offset;
> +
> +		offset = RTE_PCI_EXT_CAP_NEXT(header);
> +
> +		if (offset < RTE_PCI_CFG_SPACE_SIZE)
> +			break;
> +
> +		if (rte_pci_read_config(dev, &header, 4, offset) < 0) {
> +			RTE_LOG(ERR, EAL,
> +				"error in reading extended capabilities\n");
> +			return -1;
> +		}
> +
> +		ttl--;
> +	}
> +
> +	return 0;
> +}
> +
>  struct rte_pci_bus rte_pci_bus = {
>  	.bus = {
>  		.scan = rte_pci_scan,
> diff --git a/drivers/bus/pci/rte_bus_pci.h b/drivers/bus/pci/rte_bus_pci.h
> index 29bea6d70..f11af3762 100644
> --- a/drivers/bus/pci/rte_bus_pci.h
> +++ b/drivers/bus/pci/rte_bus_pci.h
> @@ -224,6 +224,26 @@ void rte_pci_unmap_device(struct rte_pci_device *dev);
>   */
>  void rte_pci_dump(FILE *f);
>  
> +/**
> + * Find device's extended PCI capability.
> + *
> + *  @param dev
> + *    A pointer to rte_pci_device structure.
> + *
> + *  @param cap
> + *    Extended capability to be found, which can be any from
> + *    RTE_PCI_EXT_CAP_ID_*, defined in librte_pci.
> + *
> + *  @return
> + *  > 0: The offset of the next matching extended capability structure
> + *       within the device's PCI configuration space.
> + *  < 0: An error in PCI config space read.
> + *  = 0: Device does not support it.
> + */
> +__rte_experimental
> +off_t rte_pci_find_next_ext_capability(struct rte_pci_device *dev,
> +				       uint32_t cap);
> +
>  /**
>   * Register a PCI driver.
>   *
> diff --git a/drivers/bus/pci/rte_bus_pci_version.map b/drivers/bus/pci/rte_bus_pci_version.map
> index 012d817e1..b5322660d 100644
> --- a/drivers/bus/pci/rte_bus_pci_version.map
> +++ b/drivers/bus/pci/rte_bus_pci_version.map
> @@ -16,3 +16,9 @@ DPDK_20.0 {
>  
>  	local: *;
>  };
> +
> +EXPERIMENTAL {
> +	global:
> +
> +	rte_pci_find_next_ext_capability;
> +};
> diff --git a/drivers/net/ice/ice_ethdev.c b/drivers/net/ice/ice_ethdev.c
> index 7dd3fcd27..6c8cbea5c 100644
> --- a/drivers/net/ice/ice_ethdev.c
> +++ b/drivers/net/ice/ice_ethdev.c
> @@ -1730,53 +1730,6 @@ ice_pf_setup(struct ice_pf *pf)
>  	return 0;
>  }
>  
> -/* PCIe configuration space setting */
> -#define PCI_CFG_SPACE_SIZE          256
> -#define PCI_CFG_SPACE_EXP_SIZE      4096
> -#define PCI_EXT_CAP_ID(header)      (int)((header) & 0x0000ffff)
> -#define PCI_EXT_CAP_NEXT(header)    (((header) >> 20) & 0xffc)
> -#define PCI_EXT_CAP_ID_DSN          0x03
> -
> -static int
> -ice_pci_find_next_ext_capability(struct rte_pci_device *dev, int cap)
> -{
> -	uint32_t header;
> -	int ttl;
> -	int pos = PCI_CFG_SPACE_SIZE;
> -
> -	/* minimum 8 bytes per capability */
> -	ttl = (PCI_CFG_SPACE_EXP_SIZE - PCI_CFG_SPACE_SIZE) / 8;
> -
> -	if (rte_pci_read_config(dev, &header, 4, pos) < 0) {
> -		PMD_INIT_LOG(ERR, "ice error reading extended capabilities\n");
> -		return -1;
> -	}
> -
> -	/*
> -	 * If we have no capabilities, this is indicated by cap ID,
> -	 * cap version and next pointer all being 0.
> -	 */
> -	if (header == 0)
> -		return 0;
> -
> -	while (ttl-- > 0) {
> -		if (PCI_EXT_CAP_ID(header) == cap)
> -			return pos;
> -
> -		pos = PCI_EXT_CAP_NEXT(header);
> -
> -		if (pos < PCI_CFG_SPACE_SIZE)
> -			break;
> -
> -		if (rte_pci_read_config(dev, &header, 4, pos) < 0) {
> -			PMD_INIT_LOG(ERR, "ice error reading extended capabilities\n");
> -			return -1;
> -		}
> -	}
> -
> -	return 0;
> -}
> -
>  /*
>   * Extract device serial number from PCIe Configuration Space and
>   * determine the pkg file path according to the DSN.
> @@ -1784,12 +1737,12 @@ ice_pci_find_next_ext_capability(struct rte_pci_device *dev, int cap)
>  static int
>  ice_pkg_file_search_path(struct rte_pci_device *pci_dev, char *pkg_file)
>  {
> -	int pos;
> +	off_t pos;
>  	char opt_ddp_filename[ICE_MAX_PKG_FILENAME_SIZE];
>  	uint32_t dsn_low, dsn_high;
>  	memset(opt_ddp_filename, 0, ICE_MAX_PKG_FILENAME_SIZE);
>  
> -	pos = ice_pci_find_next_ext_capability(pci_dev, PCI_EXT_CAP_ID_DSN);
> +	pos = rte_pci_find_next_ext_capability(pci_dev, RTE_PCI_EXT_CAP_ID_DSN);
>  
>  	if (pos) {
>  		rte_pci_read_config(pci_dev, &dsn_low, 4, pos + 4);
> diff --git a/drivers/net/nfp/nfpcore/nfp_cpp_pcie_ops.c b/drivers/net/nfp/nfpcore/nfp_cpp_pcie_ops.c
> index 0b9db974e..dbab4f8cb 100644
> --- a/drivers/net/nfp/nfpcore/nfp_cpp_pcie_ops.c
> +++ b/drivers/net/nfp/nfpcore/nfp_cpp_pcie_ops.c
> @@ -746,59 +746,15 @@ nfp6000_set_interface(struct rte_pci_device *dev, struct nfp_cpp *cpp)
>  	return 0;
>  }
>  
> -#define PCI_CFG_SPACE_SIZE	256
> -#define PCI_CFG_SPACE_EXP_SIZE	4096
> -#define PCI_EXT_CAP_ID(header)		(int)(header & 0x0000ffff)
> -#define PCI_EXT_CAP_NEXT(header)	((header >> 20) & 0xffc)
> -#define PCI_EXT_CAP_ID_DSN	0x03
> -static int
> -nfp_pci_find_next_ext_capability(struct rte_pci_device *dev, int cap)
> -{
> -	uint32_t header;
> -	int ttl;
> -	int pos = PCI_CFG_SPACE_SIZE;
> -
> -	/* minimum 8 bytes per capability */
> -	ttl = (PCI_CFG_SPACE_EXP_SIZE - PCI_CFG_SPACE_SIZE) / 8;
> -
> -	if (rte_pci_read_config(dev, &header, 4, pos) < 0) {
> -		printf("nfp error reading extended capabilities\n");
> -		return -1;
> -	}
> -
> -	/*
> -	 * If we have no capabilities, this is indicated by cap ID,
> -	 * cap version and next pointer all being 0.
> -	 */
> -	if (header == 0)
> -		return 0;
> -
> -	while (ttl-- > 0) {
> -		if (PCI_EXT_CAP_ID(header) == cap)
> -			return pos;
> -
> -		pos = PCI_EXT_CAP_NEXT(header);
> -		if (pos < PCI_CFG_SPACE_SIZE)
> -			break;
> -
> -		if (rte_pci_read_config(dev, &header, 4, pos) < 0) {
> -			printf("nfp error reading extended capabilities\n");
> -			return -1;
> -		}
> -	}
> -
> -	return 0;
> -}
> -
>  static int
>  nfp6000_set_serial(struct rte_pci_device *dev, struct nfp_cpp *cpp)
>  {
>  	uint16_t tmp;
>  	uint8_t serial[6];
>  	int serial_len = 6;
> -	int pos;
> +	off_t pos;
>  
> -	pos = nfp_pci_find_next_ext_capability(dev, PCI_EXT_CAP_ID_DSN);
> +	pos = rte_pci_find_next_ext_capability(dev, RTE_PCI_EXT_CAP_ID_DSN);
>  	if (pos <= 0) {
>  		printf("PCI_EXT_CAP_ID_DSN not found. nfp set serial failed\n");
>  		return -1;
> diff --git a/drivers/raw/ifpga/ifpga_rawdev.c b/drivers/raw/ifpga/ifpga_rawdev.c
> index cc25c662b..07aef4f6e 100644
> --- a/drivers/raw/ifpga/ifpga_rawdev.c
> +++ b/drivers/raw/ifpga/ifpga_rawdev.c
> @@ -41,12 +41,6 @@
>  #include "ifpga_rawdev.h"
>  #include "ipn3ke_rawdev_api.h"
>  
> -#define RTE_PCI_EXT_CAP_ID_ERR           0x01	/* Advanced Error Reporting */
> -#define RTE_PCI_CFG_SPACE_SIZE           256
> -#define RTE_PCI_CFG_SPACE_EXP_SIZE       4096
> -#define RTE_PCI_EXT_CAP_ID(header)       (int)(header & 0x0000ffff)
> -#define RTE_PCI_EXT_CAP_NEXT(header)     ((header >> 20) & 0xffc)
> -
>  #define PCI_VENDOR_ID_INTEL          0x8086
>  /* PCI Device ID */
>  #define PCIE_DEVICE_ID_PF_INT_5_X    0xBCBD
> @@ -86,8 +80,8 @@ ifpga_rawdev_allocate(struct rte_rawdev *rawdev);
>  static int set_surprise_link_check_aer(
>  		struct ifpga_rawdev *ifpga_rdev, int force_disable);
>  static int ifpga_pci_find_next_ext_capability(unsigned int fd,
> -		int start, int cap);
> -static int ifpga_pci_find_ext_capability(unsigned int fd, int cap);
> +					      int start, uint32_t cap);
> +static int ifpga_pci_find_ext_capability(unsigned int fd, uint32_t cap);
>  
>  struct ifpga_rawdev *
>  ifpga_rawdev_get(const struct rte_rawdev *rawdev)
> @@ -144,8 +138,8 @@ ifpga_rawdev_allocate(struct rte_rawdev *rawdev)
>  	return dev;
>  }
>  
> -static int ifpga_pci_find_next_ext_capability(unsigned int fd,
> -int start, int cap)
> +static int
> +ifpga_pci_find_next_ext_capability(unsigned int fd, int start, uint32_t cap)
>  {
>  	uint32_t header;
>  	int ttl;
> @@ -183,7 +177,8 @@ int start, int cap)
>  	return 0;
>  }
>  
> -static int ifpga_pci_find_ext_capability(unsigned int fd, int cap)
> +static int
> +ifpga_pci_find_ext_capability(unsigned int fd, uint32_t cap)
>  {
>  	return ifpga_pci_find_next_ext_capability(fd, 0, cap);
>  }
> diff --git a/lib/librte_pci/rte_pci.h b/lib/librte_pci/rte_pci.h
> index a03235da1..fec51e15a 100644
> --- a/lib/librte_pci/rte_pci.h
> +++ b/lib/librte_pci/rte_pci.h
> @@ -22,6 +22,22 @@ extern "C" {
>  #include <inttypes.h>
>  #include <sys/types.h>
>  
> +
> +/*
> + * Conventional PCI and PCI-X Mode 1 devices have 256 bytes of
> + * configuration space.  PCI-X Mode 2 and PCIe devices have 4096 bytes of
> + * configuration space.
> + */
> +#define RTE_PCI_CFG_SPACE_SIZE		256
> +#define RTE_PCI_CFG_SPACE_EXP_SIZE	4096
> +
> +/* Extended Capabilities (PCI-X 2.0 and Express) */
> +#define RTE_PCI_EXT_CAP_ID(header)	(header & 0x0000ffff)
> +#define RTE_PCI_EXT_CAP_NEXT(header)	((header >> 20) & 0xffc)
> +
> +#define RTE_PCI_EXT_CAP_ID_ERR	0x01	/* Advanced Error Reporting */
> +#define RTE_PCI_EXT_CAP_ID_DSN	0x03	/* Device Serial Number */
> +
>  /** Formatting string for PCI device identifier: Ex: 0000:00:01.0 */
>  #define PCI_PRI_FMT "%.4" PRIx32 ":%.2" PRIx8 ":%.2" PRIx8 ".%" PRIx8
>  #define PCI_PRI_STR_SIZE sizeof("XXXXXXXX:XX:XX.X")
> -- 
> 2.17.1
>

Patch
diff mbox series

diff --git a/drivers/bus/pci/pci_common.c b/drivers/bus/pci/pci_common.c
index a8e5fd52c..98c1f8155 100644
--- a/drivers/bus/pci/pci_common.c
+++ b/drivers/bus/pci/pci_common.c
@@ -665,6 +665,49 @@  rte_pci_get_iommu_class(void)
 	return iova_mode;
 }
 
+off_t
+rte_pci_find_next_ext_capability(struct rte_pci_device *dev, uint32_t cap)
+{
+	off_t offset = RTE_PCI_CFG_SPACE_SIZE;
+	uint32_t header;
+	int ttl;
+
+	/* minimum 8 bytes per capability */
+	ttl = (RTE_PCI_CFG_SPACE_EXP_SIZE - RTE_PCI_CFG_SPACE_SIZE) / 8;
+
+	if (rte_pci_read_config(dev, &header, 4, offset) < 0) {
+		RTE_LOG(ERR, EAL, "error in reading extended capabilities\n");
+		return -1;
+	}
+
+	/*
+	 * If we have no capabilities, this is indicated by cap ID,
+	 * cap version and next pointer all being 0.
+	 */
+	if (header == 0)
+		return 0;
+
+	while (ttl != 0) {
+		if (RTE_PCI_EXT_CAP_ID(header) == cap)
+			return offset;
+
+		offset = RTE_PCI_EXT_CAP_NEXT(header);
+
+		if (offset < RTE_PCI_CFG_SPACE_SIZE)
+			break;
+
+		if (rte_pci_read_config(dev, &header, 4, offset) < 0) {
+			RTE_LOG(ERR, EAL,
+				"error in reading extended capabilities\n");
+			return -1;
+		}
+
+		ttl--;
+	}
+
+	return 0;
+}
+
 struct rte_pci_bus rte_pci_bus = {
 	.bus = {
 		.scan = rte_pci_scan,
diff --git a/drivers/bus/pci/rte_bus_pci.h b/drivers/bus/pci/rte_bus_pci.h
index 29bea6d70..f11af3762 100644
--- a/drivers/bus/pci/rte_bus_pci.h
+++ b/drivers/bus/pci/rte_bus_pci.h
@@ -224,6 +224,26 @@  void rte_pci_unmap_device(struct rte_pci_device *dev);
  */
 void rte_pci_dump(FILE *f);
 
+/**
+ * Find device's extended PCI capability.
+ *
+ *  @param dev
+ *    A pointer to rte_pci_device structure.
+ *
+ *  @param cap
+ *    Extended capability to be found, which can be any from
+ *    RTE_PCI_EXT_CAP_ID_*, defined in librte_pci.
+ *
+ *  @return
+ *  > 0: The offset of the next matching extended capability structure
+ *       within the device's PCI configuration space.
+ *  < 0: An error in PCI config space read.
+ *  = 0: Device does not support it.
+ */
+__rte_experimental
+off_t rte_pci_find_next_ext_capability(struct rte_pci_device *dev,
+				       uint32_t cap);
+
 /**
  * Register a PCI driver.
  *
diff --git a/drivers/bus/pci/rte_bus_pci_version.map b/drivers/bus/pci/rte_bus_pci_version.map
index 012d817e1..b5322660d 100644
--- a/drivers/bus/pci/rte_bus_pci_version.map
+++ b/drivers/bus/pci/rte_bus_pci_version.map
@@ -16,3 +16,9 @@  DPDK_20.0 {
 
 	local: *;
 };
+
+EXPERIMENTAL {
+	global:
+
+	rte_pci_find_next_ext_capability;
+};
diff --git a/drivers/net/ice/ice_ethdev.c b/drivers/net/ice/ice_ethdev.c
index 7dd3fcd27..6c8cbea5c 100644
--- a/drivers/net/ice/ice_ethdev.c
+++ b/drivers/net/ice/ice_ethdev.c
@@ -1730,53 +1730,6 @@  ice_pf_setup(struct ice_pf *pf)
 	return 0;
 }
 
-/* PCIe configuration space setting */
-#define PCI_CFG_SPACE_SIZE          256
-#define PCI_CFG_SPACE_EXP_SIZE      4096
-#define PCI_EXT_CAP_ID(header)      (int)((header) & 0x0000ffff)
-#define PCI_EXT_CAP_NEXT(header)    (((header) >> 20) & 0xffc)
-#define PCI_EXT_CAP_ID_DSN          0x03
-
-static int
-ice_pci_find_next_ext_capability(struct rte_pci_device *dev, int cap)
-{
-	uint32_t header;
-	int ttl;
-	int pos = PCI_CFG_SPACE_SIZE;
-
-	/* minimum 8 bytes per capability */
-	ttl = (PCI_CFG_SPACE_EXP_SIZE - PCI_CFG_SPACE_SIZE) / 8;
-
-	if (rte_pci_read_config(dev, &header, 4, pos) < 0) {
-		PMD_INIT_LOG(ERR, "ice error reading extended capabilities\n");
-		return -1;
-	}
-
-	/*
-	 * If we have no capabilities, this is indicated by cap ID,
-	 * cap version and next pointer all being 0.
-	 */
-	if (header == 0)
-		return 0;
-
-	while (ttl-- > 0) {
-		if (PCI_EXT_CAP_ID(header) == cap)
-			return pos;
-
-		pos = PCI_EXT_CAP_NEXT(header);
-
-		if (pos < PCI_CFG_SPACE_SIZE)
-			break;
-
-		if (rte_pci_read_config(dev, &header, 4, pos) < 0) {
-			PMD_INIT_LOG(ERR, "ice error reading extended capabilities\n");
-			return -1;
-		}
-	}
-
-	return 0;
-}
-
 /*
  * Extract device serial number from PCIe Configuration Space and
  * determine the pkg file path according to the DSN.
@@ -1784,12 +1737,12 @@  ice_pci_find_next_ext_capability(struct rte_pci_device *dev, int cap)
 static int
 ice_pkg_file_search_path(struct rte_pci_device *pci_dev, char *pkg_file)
 {
-	int pos;
+	off_t pos;
 	char opt_ddp_filename[ICE_MAX_PKG_FILENAME_SIZE];
 	uint32_t dsn_low, dsn_high;
 	memset(opt_ddp_filename, 0, ICE_MAX_PKG_FILENAME_SIZE);
 
-	pos = ice_pci_find_next_ext_capability(pci_dev, PCI_EXT_CAP_ID_DSN);
+	pos = rte_pci_find_next_ext_capability(pci_dev, RTE_PCI_EXT_CAP_ID_DSN);
 
 	if (pos) {
 		rte_pci_read_config(pci_dev, &dsn_low, 4, pos + 4);
diff --git a/drivers/net/nfp/nfpcore/nfp_cpp_pcie_ops.c b/drivers/net/nfp/nfpcore/nfp_cpp_pcie_ops.c
index 0b9db974e..dbab4f8cb 100644
--- a/drivers/net/nfp/nfpcore/nfp_cpp_pcie_ops.c
+++ b/drivers/net/nfp/nfpcore/nfp_cpp_pcie_ops.c
@@ -746,59 +746,15 @@  nfp6000_set_interface(struct rte_pci_device *dev, struct nfp_cpp *cpp)
 	return 0;
 }
 
-#define PCI_CFG_SPACE_SIZE	256
-#define PCI_CFG_SPACE_EXP_SIZE	4096
-#define PCI_EXT_CAP_ID(header)		(int)(header & 0x0000ffff)
-#define PCI_EXT_CAP_NEXT(header)	((header >> 20) & 0xffc)
-#define PCI_EXT_CAP_ID_DSN	0x03
-static int
-nfp_pci_find_next_ext_capability(struct rte_pci_device *dev, int cap)
-{
-	uint32_t header;
-	int ttl;
-	int pos = PCI_CFG_SPACE_SIZE;
-
-	/* minimum 8 bytes per capability */
-	ttl = (PCI_CFG_SPACE_EXP_SIZE - PCI_CFG_SPACE_SIZE) / 8;
-
-	if (rte_pci_read_config(dev, &header, 4, pos) < 0) {
-		printf("nfp error reading extended capabilities\n");
-		return -1;
-	}
-
-	/*
-	 * If we have no capabilities, this is indicated by cap ID,
-	 * cap version and next pointer all being 0.
-	 */
-	if (header == 0)
-		return 0;
-
-	while (ttl-- > 0) {
-		if (PCI_EXT_CAP_ID(header) == cap)
-			return pos;
-
-		pos = PCI_EXT_CAP_NEXT(header);
-		if (pos < PCI_CFG_SPACE_SIZE)
-			break;
-
-		if (rte_pci_read_config(dev, &header, 4, pos) < 0) {
-			printf("nfp error reading extended capabilities\n");
-			return -1;
-		}
-	}
-
-	return 0;
-}
-
 static int
 nfp6000_set_serial(struct rte_pci_device *dev, struct nfp_cpp *cpp)
 {
 	uint16_t tmp;
 	uint8_t serial[6];
 	int serial_len = 6;
-	int pos;
+	off_t pos;
 
-	pos = nfp_pci_find_next_ext_capability(dev, PCI_EXT_CAP_ID_DSN);
+	pos = rte_pci_find_next_ext_capability(dev, RTE_PCI_EXT_CAP_ID_DSN);
 	if (pos <= 0) {
 		printf("PCI_EXT_CAP_ID_DSN not found. nfp set serial failed\n");
 		return -1;
diff --git a/drivers/raw/ifpga/ifpga_rawdev.c b/drivers/raw/ifpga/ifpga_rawdev.c
index cc25c662b..07aef4f6e 100644
--- a/drivers/raw/ifpga/ifpga_rawdev.c
+++ b/drivers/raw/ifpga/ifpga_rawdev.c
@@ -41,12 +41,6 @@ 
 #include "ifpga_rawdev.h"
 #include "ipn3ke_rawdev_api.h"
 
-#define RTE_PCI_EXT_CAP_ID_ERR           0x01	/* Advanced Error Reporting */
-#define RTE_PCI_CFG_SPACE_SIZE           256
-#define RTE_PCI_CFG_SPACE_EXP_SIZE       4096
-#define RTE_PCI_EXT_CAP_ID(header)       (int)(header & 0x0000ffff)
-#define RTE_PCI_EXT_CAP_NEXT(header)     ((header >> 20) & 0xffc)
-
 #define PCI_VENDOR_ID_INTEL          0x8086
 /* PCI Device ID */
 #define PCIE_DEVICE_ID_PF_INT_5_X    0xBCBD
@@ -86,8 +80,8 @@  ifpga_rawdev_allocate(struct rte_rawdev *rawdev);
 static int set_surprise_link_check_aer(
 		struct ifpga_rawdev *ifpga_rdev, int force_disable);
 static int ifpga_pci_find_next_ext_capability(unsigned int fd,
-		int start, int cap);
-static int ifpga_pci_find_ext_capability(unsigned int fd, int cap);
+					      int start, uint32_t cap);
+static int ifpga_pci_find_ext_capability(unsigned int fd, uint32_t cap);
 
 struct ifpga_rawdev *
 ifpga_rawdev_get(const struct rte_rawdev *rawdev)
@@ -144,8 +138,8 @@  ifpga_rawdev_allocate(struct rte_rawdev *rawdev)
 	return dev;
 }
 
-static int ifpga_pci_find_next_ext_capability(unsigned int fd,
-int start, int cap)
+static int
+ifpga_pci_find_next_ext_capability(unsigned int fd, int start, uint32_t cap)
 {
 	uint32_t header;
 	int ttl;
@@ -183,7 +177,8 @@  int start, int cap)
 	return 0;
 }
 
-static int ifpga_pci_find_ext_capability(unsigned int fd, int cap)
+static int
+ifpga_pci_find_ext_capability(unsigned int fd, uint32_t cap)
 {
 	return ifpga_pci_find_next_ext_capability(fd, 0, cap);
 }
diff --git a/lib/librte_pci/rte_pci.h b/lib/librte_pci/rte_pci.h
index a03235da1..fec51e15a 100644
--- a/lib/librte_pci/rte_pci.h
+++ b/lib/librte_pci/rte_pci.h
@@ -22,6 +22,22 @@  extern "C" {
 #include <inttypes.h>
 #include <sys/types.h>
 
+
+/*
+ * Conventional PCI and PCI-X Mode 1 devices have 256 bytes of
+ * configuration space.  PCI-X Mode 2 and PCIe devices have 4096 bytes of
+ * configuration space.
+ */
+#define RTE_PCI_CFG_SPACE_SIZE		256
+#define RTE_PCI_CFG_SPACE_EXP_SIZE	4096
+
+/* Extended Capabilities (PCI-X 2.0 and Express) */
+#define RTE_PCI_EXT_CAP_ID(header)	(header & 0x0000ffff)
+#define RTE_PCI_EXT_CAP_NEXT(header)	((header >> 20) & 0xffc)
+
+#define RTE_PCI_EXT_CAP_ID_ERR	0x01	/* Advanced Error Reporting */
+#define RTE_PCI_EXT_CAP_ID_DSN	0x03	/* Device Serial Number */
+
 /** Formatting string for PCI device identifier: Ex: 0000:00:01.0 */
 #define PCI_PRI_FMT "%.4" PRIx32 ":%.2" PRIx8 ":%.2" PRIx8 ".%" PRIx8
 #define PCI_PRI_STR_SIZE sizeof("XXXXXXXX:XX:XX.X")