[dpdk-dev,PATCHv7,1/6] pmdinfogen: Add buildtools and pmdinfogen utility
diff mbox

Message ID 1465494421-6210-2-git-send-email-nhorman@tuxdriver.com
State Superseded, archived
Delegated to: Thomas Monjalon
Headers show

Commit Message

Neil Horman June 9, 2016, 5:46 p.m. UTC
pmdinfogen is a tool used to parse object files and build json strings for
use in later determining hardware support in a dso or application binary.
pmdinfo looks for the non-exported symbol names this_pmd_name<n> and
this_pmd_tbl<n> (where n is a integer counter).  It records the name of
each of these tuples, using the later to find the symbolic name of the
pci_table for physical devices that the object supports.  With this
information, it outputs a C file with a single line of the form:

static char *<pmd_name>_driver_info[] __attribute__((used)) = " \
	PMD_DRIVER_INFO=<json string>";

Where <pmd_name> is the arbitrary name of the pmd, and <json_string> is the
json encoded string that hold relevant pmd information, including the pmd
name, type and optional array of pci device/vendor ids that the driver
supports.

This c file is suitable for compiling to object code, then relocatably
linking into the parent file from which the C was generated.  This creates
an entry in the string table of the object that can inform a later tool
about hardware support.

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
CC: Bruce Richardson <bruce.richardson@intel.com>
CC: Thomas Monjalon <thomas.monjalon@6wind.com>
CC: Stephen Hemminger <stephen@networkplumber.org>
CC: Panu Matilainen <pmatilai@redhat.com>
---
 GNUmakefile                        |   2 +-
 buildtools/Makefile                |  36 +++
 buildtools/pmdinfogen/Makefile     |  49 +++++
 buildtools/pmdinfogen/pmdinfogen.c | 439 +++++++++++++++++++++++++++++++++++++
 buildtools/pmdinfogen/pmdinfogen.h | 120 ++++++++++
 mk/rte.hostapp.mk                  |   8 +-
 mk/rte.sdkbuild.mk                 |   3 +-
 7 files changed, 651 insertions(+), 6 deletions(-)
 create mode 100644 buildtools/Makefile
 create mode 100644 buildtools/pmdinfogen/Makefile
 create mode 100644 buildtools/pmdinfogen/pmdinfogen.c
 create mode 100644 buildtools/pmdinfogen/pmdinfogen.h

Comments

Panu Matilainen June 16, 2016, 12:29 p.m. UTC | #1
On 06/09/2016 08:46 PM, Neil Horman wrote:
> pmdinfogen is a tool used to parse object files and build json strings for
> use in later determining hardware support in a dso or application binary.
> pmdinfo looks for the non-exported symbol names this_pmd_name<n> and
> this_pmd_tbl<n> (where n is a integer counter).  It records the name of
> each of these tuples, using the later to find the symbolic name of the
> pci_table for physical devices that the object supports.  With this
> information, it outputs a C file with a single line of the form:
>
> static char *<pmd_name>_driver_info[] __attribute__((used)) = " \
> 	PMD_DRIVER_INFO=<json string>";
>
> Where <pmd_name> is the arbitrary name of the pmd, and <json_string> is the
> json encoded string that hold relevant pmd information, including the pmd
> name, type and optional array of pci device/vendor ids that the driver
> supports.
>
> This c file is suitable for compiling to object code, then relocatably
> linking into the parent file from which the C was generated.  This creates
> an entry in the string table of the object that can inform a later tool
> about hardware support.
>
> Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
> CC: Bruce Richardson <bruce.richardson@intel.com>
> CC: Thomas Monjalon <thomas.monjalon@6wind.com>
> CC: Stephen Hemminger <stephen@networkplumber.org>
> CC: Panu Matilainen <pmatilai@redhat.com>
> ---

Unlike earlier versions, pmdinfogen ends up installed in bindir during 
"make install". Is that intentional, or just a side-effect from using 
rte.hostapp.mk? If its intentional it probably should be prefixed with 
dpdk_ like the other tools.

	- Panu -
Neil Horman June 16, 2016, 1:33 p.m. UTC | #2
On Thu, Jun 16, 2016 at 03:29:57PM +0300, Panu Matilainen wrote:
> On 06/09/2016 08:46 PM, Neil Horman wrote:
> > pmdinfogen is a tool used to parse object files and build json strings for
> > use in later determining hardware support in a dso or application binary.
> > pmdinfo looks for the non-exported symbol names this_pmd_name<n> and
> > this_pmd_tbl<n> (where n is a integer counter).  It records the name of
> > each of these tuples, using the later to find the symbolic name of the
> > pci_table for physical devices that the object supports.  With this
> > information, it outputs a C file with a single line of the form:
> > 
> > static char *<pmd_name>_driver_info[] __attribute__((used)) = " \
> > 	PMD_DRIVER_INFO=<json string>";
> > 
> > Where <pmd_name> is the arbitrary name of the pmd, and <json_string> is the
> > json encoded string that hold relevant pmd information, including the pmd
> > name, type and optional array of pci device/vendor ids that the driver
> > supports.
> > 
> > This c file is suitable for compiling to object code, then relocatably
> > linking into the parent file from which the C was generated.  This creates
> > an entry in the string table of the object that can inform a later tool
> > about hardware support.
> > 
> > Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
> > CC: Bruce Richardson <bruce.richardson@intel.com>
> > CC: Thomas Monjalon <thomas.monjalon@6wind.com>
> > CC: Stephen Hemminger <stephen@networkplumber.org>
> > CC: Panu Matilainen <pmatilai@redhat.com>
> > ---
> 
> Unlike earlier versions, pmdinfogen ends up installed in bindir during "make
> install". Is that intentional, or just a side-effect from using
> rte.hostapp.mk? If its intentional it probably should be prefixed with dpdk_
> like the other tools.
> 
Im not sure what the answer is here.  As you can see, Thomas and I argued at
length over which makefile to use, and I gave up, so I suppose you can call it
intentional.  Being in bindir makes a reasonable amount of sense I suppose, as
3rd party developers can use it during their independent driver development.
I'm not sure I agree with prefixing it though.  Given that the hostapp.mk file
installs everything there, and nothing that previously used that make file had a
dpdk_ prefix that I can tell, I'm not sure why this would.  pmdinfogen seems
like a pretty unique name, and I know of no other project that uses the term pmd
to describe anything.

Neil

> 	- Panu -
> 
>
Panu Matilainen June 16, 2016, 2:06 p.m. UTC | #3
On 06/16/2016 04:33 PM, Neil Horman wrote:
> On Thu, Jun 16, 2016 at 03:29:57PM +0300, Panu Matilainen wrote:
>> On 06/09/2016 08:46 PM, Neil Horman wrote:
>>> pmdinfogen is a tool used to parse object files and build json strings for
>>> use in later determining hardware support in a dso or application binary.
>>> pmdinfo looks for the non-exported symbol names this_pmd_name<n> and
>>> this_pmd_tbl<n> (where n is a integer counter).  It records the name of
>>> each of these tuples, using the later to find the symbolic name of the
>>> pci_table for physical devices that the object supports.  With this
>>> information, it outputs a C file with a single line of the form:
>>>
>>> static char *<pmd_name>_driver_info[] __attribute__((used)) = " \
>>> 	PMD_DRIVER_INFO=<json string>";
>>>
>>> Where <pmd_name> is the arbitrary name of the pmd, and <json_string> is the
>>> json encoded string that hold relevant pmd information, including the pmd
>>> name, type and optional array of pci device/vendor ids that the driver
>>> supports.
>>>
>>> This c file is suitable for compiling to object code, then relocatably
>>> linking into the parent file from which the C was generated.  This creates
>>> an entry in the string table of the object that can inform a later tool
>>> about hardware support.
>>>
>>> Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
>>> CC: Bruce Richardson <bruce.richardson@intel.com>
>>> CC: Thomas Monjalon <thomas.monjalon@6wind.com>
>>> CC: Stephen Hemminger <stephen@networkplumber.org>
>>> CC: Panu Matilainen <pmatilai@redhat.com>
>>> ---
>>
>> Unlike earlier versions, pmdinfogen ends up installed in bindir during "make
>> install". Is that intentional, or just a side-effect from using
>> rte.hostapp.mk? If its intentional it probably should be prefixed with dpdk_
>> like the other tools.
>>
> Im not sure what the answer is here.  As you can see, Thomas and I argued at
> length over which makefile to use, and I gave up, so I suppose you can call it
> intentional.  Being in bindir makes a reasonable amount of sense I suppose, as
> 3rd party developers can use it during their independent driver development.

Right, it'd be useful for 3rd party driver developer, so lets consider 
it intentional :)

> I'm not sure I agree with prefixing it though.  Given that the hostapp.mk file
> installs everything there, and nothing that previously used that make file had a
> dpdk_ prefix that I can tell, I'm not sure why this would.  pmdinfogen seems
> like a pretty unique name, and I know of no other project that uses the term pmd
> to describe anything.

I agree about "pmd" being fairly unique as is, but if pmdinfo is dpdk_ 
prefixed then this should be too, or neither should be prefixed. I dont 
personally care which way, but it should be consistent.

	- Panu -

>
> Neil
>
>> 	- Panu -
>>
>>
Neil Horman June 16, 2016, 2:41 p.m. UTC | #4
On Thu, Jun 16, 2016 at 05:06:49PM +0300, Panu Matilainen wrote:
> On 06/16/2016 04:33 PM, Neil Horman wrote:
> > On Thu, Jun 16, 2016 at 03:29:57PM +0300, Panu Matilainen wrote:
> > > On 06/09/2016 08:46 PM, Neil Horman wrote:
> > > > pmdinfogen is a tool used to parse object files and build json strings for
> > > > use in later determining hardware support in a dso or application binary.
> > > > pmdinfo looks for the non-exported symbol names this_pmd_name<n> and
> > > > this_pmd_tbl<n> (where n is a integer counter).  It records the name of
> > > > each of these tuples, using the later to find the symbolic name of the
> > > > pci_table for physical devices that the object supports.  With this
> > > > information, it outputs a C file with a single line of the form:
> > > > 
> > > > static char *<pmd_name>_driver_info[] __attribute__((used)) = " \
> > > > 	PMD_DRIVER_INFO=<json string>";
> > > > 
> > > > Where <pmd_name> is the arbitrary name of the pmd, and <json_string> is the
> > > > json encoded string that hold relevant pmd information, including the pmd
> > > > name, type and optional array of pci device/vendor ids that the driver
> > > > supports.
> > > > 
> > > > This c file is suitable for compiling to object code, then relocatably
> > > > linking into the parent file from which the C was generated.  This creates
> > > > an entry in the string table of the object that can inform a later tool
> > > > about hardware support.
> > > > 
> > > > Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
> > > > CC: Bruce Richardson <bruce.richardson@intel.com>
> > > > CC: Thomas Monjalon <thomas.monjalon@6wind.com>
> > > > CC: Stephen Hemminger <stephen@networkplumber.org>
> > > > CC: Panu Matilainen <pmatilai@redhat.com>
> > > > ---
> > > 
> > > Unlike earlier versions, pmdinfogen ends up installed in bindir during "make
> > > install". Is that intentional, or just a side-effect from using
> > > rte.hostapp.mk? If its intentional it probably should be prefixed with dpdk_
> > > like the other tools.
> > > 
> > Im not sure what the answer is here.  As you can see, Thomas and I argued at
> > length over which makefile to use, and I gave up, so I suppose you can call it
> > intentional.  Being in bindir makes a reasonable amount of sense I suppose, as
> > 3rd party developers can use it during their independent driver development.
> 
> Right, it'd be useful for 3rd party driver developer, so lets consider it
> intentional :)
> 
> > I'm not sure I agree with prefixing it though.  Given that the hostapp.mk file
> > installs everything there, and nothing that previously used that make file had a
> > dpdk_ prefix that I can tell, I'm not sure why this would.  pmdinfogen seems
> > like a pretty unique name, and I know of no other project that uses the term pmd
> > to describe anything.
> 
> I agree about "pmd" being fairly unique as is, but if pmdinfo is dpdk_
> prefixed then this should be too, or neither should be prefixed. I dont
> personally care which way, but it should be consistent.
> 
I caved on the pmdinfo issue, I guess I'll cave here too.

Patch
diff mbox

diff --git a/GNUmakefile b/GNUmakefile
index b59e4b6..00fe0db 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -40,6 +40,6 @@  export RTE_SDK
 # directory list
 #
 
-ROOTDIRS-y := lib drivers app
+ROOTDIRS-y := buildtools lib drivers app
 
 include $(RTE_SDK)/mk/rte.sdkroot.mk
diff --git a/buildtools/Makefile b/buildtools/Makefile
new file mode 100644
index 0000000..35a42ff
--- /dev/null
+++ b/buildtools/Makefile
@@ -0,0 +1,36 @@ 
+#   BSD LICENSE
+#
+#   Copyright(c) 2016 Neil Horman. All rights reserved.
+#   All rights reserved.
+#
+#   Redistribution and use in source and binary forms, with or without
+#   modification, are permitted provided that the following conditions
+#   are met:
+#
+#     * Redistributions of source code must retain the above copyright
+#       notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above copyright
+#       notice, this list of conditions and the following disclaimer in
+#       the documentation and/or other materials provided with the
+#       distribution.
+#     * Neither the name of Intel Corporation nor the names of its
+#       contributors may be used to endorse or promote products derived
+#       from this software without specific prior written permission.
+#
+#   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+#   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+#   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+#   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+#   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+#   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+#   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+#   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+#   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+#   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+#   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+include $(RTE_SDK)/mk/rte.vars.mk
+
+DIRS-y += pmdinfogen
+
+include $(RTE_SDK)/mk/rte.subdir.mk
diff --git a/buildtools/pmdinfogen/Makefile b/buildtools/pmdinfogen/Makefile
new file mode 100644
index 0000000..125901b
--- /dev/null
+++ b/buildtools/pmdinfogen/Makefile
@@ -0,0 +1,49 @@ 
+#   BSD LICENSE
+#
+#   Copyright(c) 2016 Neil Horman. All rights reserved.
+#   All rights reserved.
+#
+#   Redistribution and use in source and binary forms, with or without
+#   modification, are permitted provided that the following conditions
+#   are met:
+#
+#     * Redistributions of source code must retain the above copyright
+#       notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above copyright
+#       notice, this list of conditions and the following disclaimer in
+#       the documentation and/or other materials provided with the
+#       distribution.
+#     * Neither the name of Intel Corporation nor the names of its
+#       contributors may be used to endorse or promote products derived
+#       from this software without specific prior written permission.
+#
+#   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+#   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+#   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+#   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+#   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+#   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+#   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+#   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+#   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+#   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+#   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+include $(RTE_SDK)/mk/rte.vars.mk
+
+#
+# library name
+#
+HOSTAPP = pmdinfogen
+
+#
+# all sources are stored in SRCS-y
+#
+SRCS-y += pmdinfogen.c
+
+HOST_EXTRA_CFLAGS += -g -I${RTE_OUTPUT}/include
+
+DEPDIRS-y += lib/librte_eal
+
+include $(RTE_SDK)/mk/rte.hostapp.mk
+
diff --git a/buildtools/pmdinfogen/pmdinfogen.c b/buildtools/pmdinfogen/pmdinfogen.c
new file mode 100644
index 0000000..0947dc6
--- /dev/null
+++ b/buildtools/pmdinfogen/pmdinfogen.c
@@ -0,0 +1,439 @@ 
+/* Postprocess pmd object files to export hw support
+ *
+ * Copyright 2016 Neil Horman <nhorman@tuxdriver.com>
+ * Based in part on modpost.c from the linux kernel
+ *
+ * This software may be used and distributed according to the terms
+ * of the GNU General Public License V2, incorporated herein by reference.
+ *
+ */
+
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <ctype.h>
+#include <string.h>
+#include <limits.h>
+#include <stdbool.h>
+#include <errno.h>
+#include "pmdinfogen.h"
+
+#ifdef RTE_ARCH_64
+#define ADDR_SIZE 64
+#else
+#define ADDR_SIZE 32
+#endif
+
+
+static const char *sym_name(struct elf_info *elf, Elf_Sym *sym)
+{
+	if (sym)
+		return elf->strtab + sym->st_name;
+	else
+		return "(unknown)";
+}
+
+void *grab_file(const char *filename, unsigned long *size)
+{
+	struct stat st;
+	void *map = MAP_FAILED;
+	int fd;
+
+	fd = open(filename, O_RDONLY);
+	if (fd < 0)
+		return NULL;
+	if (fstat(fd, &st))
+		goto failed;
+
+	*size = st.st_size;
+	map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
+
+failed:
+	close(fd);
+	if (map == MAP_FAILED)
+		return NULL;
+	return map;
+}
+
+/**
+  * Return a copy of the next line in a mmap'ed file.
+  * spaces in the beginning of the line is trimmed away.
+  * Return a pointer to a static buffer.
+  **/
+void release_file(void *file, unsigned long size)
+{
+	munmap(file, size);
+}
+
+
+static void *get_sym_value(struct elf_info *info, const Elf_Sym *sym)
+{
+	void *ptr = (void *)info->hdr + info->sechdrs[sym->st_shndx].sh_offset;
+
+	return (void *)(ptr + sym->st_value);
+}
+
+static Elf_Sym *find_sym_in_symtab(struct elf_info *info,
+				   const char *name, Elf_Sym *last)
+{
+	Elf_Sym *idx;
+	if (last)
+		idx = last+1;
+	else
+		idx = info->symtab_start;
+
+	for (; idx < info->symtab_stop; idx++) {
+		const char *n = sym_name(info, idx);
+		if (!strncmp(n, name, strlen(name)))
+			return idx;
+	}
+	return NULL;
+}
+
+static int parse_elf(struct elf_info *info, const char *filename)
+{
+	unsigned int i;
+	Elf_Ehdr *hdr;
+	Elf_Shdr *sechdrs;
+	Elf_Sym  *sym;
+	const char *secstrings;
+	int endian;
+	unsigned int symtab_idx = ~0U, symtab_shndx_idx = ~0U;
+
+	hdr = grab_file(filename, &info->size);
+	if (!hdr) {
+		perror(filename);
+		exit(1);
+	}
+	info->hdr = hdr;
+	if (info->size < sizeof(*hdr)) {
+		/* file too small, assume this is an empty .o file */
+		return 0;
+	}
+	/* Is this a valid ELF file? */
+	if ((hdr->e_ident[EI_MAG0] != ELFMAG0) ||
+	    (hdr->e_ident[EI_MAG1] != ELFMAG1) ||
+	    (hdr->e_ident[EI_MAG2] != ELFMAG2) ||
+	    (hdr->e_ident[EI_MAG3] != ELFMAG3)) {
+		/* Not an ELF file - silently ignore it */
+		return 0;
+	}
+
+	if (!hdr->e_ident[EI_DATA]) {
+		/* Unknown endian */
+		return 0;
+	}
+
+	endian = hdr->e_ident[EI_DATA];
+
+	/* Fix endianness in ELF header */
+	hdr->e_type      = TO_NATIVE(endian, 16, hdr->e_type);
+	hdr->e_machine   = TO_NATIVE(endian, 16, hdr->e_machine);
+	hdr->e_version   = TO_NATIVE(endian, 32, hdr->e_version);
+	hdr->e_entry     = TO_NATIVE(endian, ADDR_SIZE, hdr->e_entry);
+	hdr->e_phoff     = TO_NATIVE(endian, ADDR_SIZE, hdr->e_phoff);
+	hdr->e_shoff     = TO_NATIVE(endian, ADDR_SIZE, hdr->e_shoff);
+	hdr->e_flags     = TO_NATIVE(endian, 32, hdr->e_flags);
+	hdr->e_ehsize    = TO_NATIVE(endian, 16, hdr->e_ehsize);
+	hdr->e_phentsize = TO_NATIVE(endian, 16, hdr->e_phentsize);
+	hdr->e_phnum     = TO_NATIVE(endian, 16, hdr->e_phnum);
+	hdr->e_shentsize = TO_NATIVE(endian, 16, hdr->e_shentsize);
+	hdr->e_shnum     = TO_NATIVE(endian, 16, hdr->e_shnum);
+	hdr->e_shstrndx  = TO_NATIVE(endian, 16, hdr->e_shstrndx);
+
+	sechdrs = (void *)hdr + hdr->e_shoff;
+	info->sechdrs = sechdrs;
+
+	/* Check if file offset is correct */
+	if (hdr->e_shoff > info->size) {
+		fprintf(stderr, "section header offset=%lu in file '%s' "
+		      "is bigger than filesize=%lu\n",
+		      (unsigned long)hdr->e_shoff,
+		      filename, info->size);
+		return 0;
+	}
+
+	if (hdr->e_shnum == SHN_UNDEF) {
+		/*
+		 * There are more than 64k sections,
+		 * read count from .sh_size.
+		 */
+		info->num_sections = TO_NATIVE(endian, 32, sechdrs[0].sh_size);
+	} else {
+		info->num_sections = hdr->e_shnum;
+	}
+	if (hdr->e_shstrndx == SHN_XINDEX)
+		info->secindex_strings =
+			TO_NATIVE(endian, 32, sechdrs[0].sh_link);
+	else
+		info->secindex_strings = hdr->e_shstrndx;
+
+	/* Fix endianness in section headers */
+	for (i = 0; i < info->num_sections; i++) {
+		sechdrs[i].sh_name      =
+			TO_NATIVE(endian, 32, sechdrs[i].sh_name);
+		sechdrs[i].sh_type      =
+			TO_NATIVE(endian, 32, sechdrs[i].sh_type);
+		sechdrs[i].sh_flags     =
+			TO_NATIVE(endian, 32, sechdrs[i].sh_flags);
+		sechdrs[i].sh_addr      =
+			TO_NATIVE(endian, ADDR_SIZE, sechdrs[i].sh_addr);
+		sechdrs[i].sh_offset    =
+			TO_NATIVE(endian, ADDR_SIZE, sechdrs[i].sh_offset);
+		sechdrs[i].sh_size      =
+			TO_NATIVE(endian, 32, sechdrs[i].sh_size);
+		sechdrs[i].sh_link      =
+			TO_NATIVE(endian, 32, sechdrs[i].sh_link);
+		sechdrs[i].sh_info      =
+			TO_NATIVE(endian, 32, sechdrs[i].sh_info);
+		sechdrs[i].sh_addralign =
+			TO_NATIVE(endian, ADDR_SIZE, sechdrs[i].sh_addralign);
+		sechdrs[i].sh_entsize   =
+			TO_NATIVE(endian, ADDR_SIZE, sechdrs[i].sh_entsize);
+	}
+	/* Find symbol table. */
+	secstrings = (void *)hdr + sechdrs[info->secindex_strings].sh_offset;
+	for (i = 1; i < info->num_sections; i++) {
+		int nobits = sechdrs[i].sh_type == SHT_NOBITS;
+
+		if (!nobits && sechdrs[i].sh_offset > info->size) {
+			fprintf(stderr, "%s is truncated. "
+			      "sechdrs[i].sh_offset=%lu > sizeof(*hrd)=%zu\n",
+			      filename, (unsigned long)sechdrs[i].sh_offset,
+			      sizeof(*hdr));
+			return 0;
+		}
+
+		if (sechdrs[i].sh_type == SHT_SYMTAB) {
+			unsigned int sh_link_idx;
+			symtab_idx = i;
+			info->symtab_start = (void *)hdr +
+			    sechdrs[i].sh_offset;
+			info->symtab_stop  = (void *)hdr +
+			    sechdrs[i].sh_offset + sechdrs[i].sh_size;
+			sh_link_idx = sechdrs[i].sh_link;
+			info->strtab       = (void *)hdr +
+			    sechdrs[sh_link_idx].sh_offset;
+		}
+
+		/* 32bit section no. table? ("more than 64k sections") */
+		if (sechdrs[i].sh_type == SHT_SYMTAB_SHNDX) {
+			symtab_shndx_idx = i;
+			info->symtab_shndx_start = (void *)hdr +
+			    sechdrs[i].sh_offset;
+			info->symtab_shndx_stop  = (void *)hdr +
+			    sechdrs[i].sh_offset + sechdrs[i].sh_size;
+		}
+	}
+	if (!info->symtab_start)
+		fprintf(stderr, "%s has no symtab?\n", filename);
+
+	/* Fix endianness in symbols */
+	for (sym = info->symtab_start; sym < info->symtab_stop; sym++) {
+		sym->st_shndx = TO_NATIVE(endian, 16, sym->st_shndx);
+		sym->st_name  = TO_NATIVE(endian, 32, sym->st_name);
+		sym->st_value = TO_NATIVE(endian, ADDR_SIZE, sym->st_value);
+		sym->st_size  = TO_NATIVE(endian, ADDR_SIZE, sym->st_size);
+	}
+
+	if (symtab_shndx_idx != ~0U) {
+		Elf32_Word *p;
+		if (symtab_idx != sechdrs[symtab_shndx_idx].sh_link)
+			fprintf(stderr,
+			      "%s: SYMTAB_SHNDX has bad sh_link: %u!=%u\n",
+			      filename, sechdrs[symtab_shndx_idx].sh_link,
+			      symtab_idx);
+		/* Fix endianness */
+		for (p = info->symtab_shndx_start; p < info->symtab_shndx_stop;
+		     p++)
+			*p = TO_NATIVE(endian, 32, *p);
+	}
+
+	return 1;
+}
+
+static void parse_elf_finish(struct elf_info *info)
+{
+	struct pmd_driver *tmp, *idx = info->drivers;
+	release_file(info->hdr, info->size);
+	while (idx) {
+		tmp = idx->next;
+		free(idx);
+		idx = tmp;
+	}
+}
+
+static const char *sec_name(struct elf_info *elf, int secindex)
+{
+	Elf_Shdr *sechdrs = elf->sechdrs;
+	return (void *)elf->hdr +
+		elf->sechdrs[elf->secindex_strings].sh_offset +
+		sechdrs[secindex].sh_name;
+}
+
+static int get_symbol_index(struct elf_info *info, Elf_Sym *sym)
+{
+	const char *name =  sym_name(info, sym);
+	const char *idx;
+
+	idx = name;
+	while (idx) {
+		if (isdigit(*idx))
+			return atoi(idx);
+		idx++;
+	}
+	return -1;
+}
+
+struct opt_tag {
+	const char *suffix;
+	const char *json_id;
+};
+
+static const struct opt_tag opt_tags[] = {
+	{"_param_string_export", "params"},
+};
+
+static int complete_pmd_entry(struct elf_info *info, struct pmd_driver *drv)
+{
+	const char *tname;
+	int i;
+	char tmpsymname[128];
+	Elf_Sym *tmpsym;
+
+	drv->name = get_sym_value(info, drv->name_sym);
+
+	for (i = 0; i < PMD_OPT_MAX; i++) {
+		memset(tmpsymname, 0, 128);
+		sprintf(tmpsymname, "__%s%s", drv->name, opt_tags[i].suffix);
+		tmpsym = find_sym_in_symtab(info, tmpsymname, NULL);
+		if (!tmpsym)
+			continue;
+		drv->opt_vals[i] = get_sym_value(info, tmpsym);
+	}
+
+	memset(tmpsymname, 0, 128);
+	sprintf(tmpsymname, "__%s_pci_tbl_export", drv->name);
+
+	tmpsym = find_sym_in_symtab(info, tmpsymname, NULL);
+
+
+	/*
+	 * If this returns NULL, then this is a PMD_VDEV, because
+	 * it has no pci table reference
+	 */
+	if (!tmpsym) {
+		drv->pci_tbl = NULL;
+		return 0;
+	}
+
+	tname = get_sym_value(info, tmpsym);
+	tmpsym = find_sym_in_symtab(info, tname, NULL);
+	if (!tmpsym)
+		return -ENOENT;
+
+	drv->pci_tbl = (struct rte_pci_id *)get_sym_value(info, tmpsym);
+	if (!drv->pci_tbl)
+		return -ENOENT;
+
+	return 0;
+}
+
+static int locate_pmd_entries(struct elf_info *info)
+{
+	Elf_Sym *last = NULL;
+	struct pmd_driver *new;
+
+	info->drivers = NULL;
+
+	do {
+		new = calloc(sizeof(struct pmd_driver), 1);
+		new->name_sym = find_sym_in_symtab(info, "this_pmd_name", last);
+		last = new->name_sym;
+		if (!new->name_sym)
+			free(new);
+		else {
+			if (complete_pmd_entry(info, new)) {
+				fprintf(stderr,
+					"Failed to complete pmd entry\n");
+				free(new);
+			} else {
+				new->next = info->drivers;
+				info->drivers = new;
+			}
+		}
+	} while (last);
+}
+
+static void output_pmd_info_string(struct elf_info *info, char *outfile)
+{
+	FILE *ofd;
+	struct pmd_driver *drv;
+	struct rte_pci_id *pci_ids;
+	int idx = 0;
+
+	ofd = fopen(outfile, "w+");
+	if (!ofd) {
+		fprintf(stderr, "Unable to open output file\n");
+		return;
+	}
+
+	drv = info->drivers;
+
+	while (drv) {
+		fprintf(ofd, "const char %s_pmd_info[] __attribute__((used)) = "
+			"\"PMD_INFO_STRING= {",
+			drv->name);
+		fprintf(ofd, "\\\"name\\\" : \\\"%s\\\", ", drv->name);
+
+		for (idx = 0; idx < PMD_OPT_MAX; idx++) {
+			if (drv->opt_vals[idx])
+				fprintf(ofd, "\\\"%s\\\" : \\\"%s\\\", ",
+					opt_tags[idx].json_id,
+					drv->opt_vals[idx]);
+		}
+
+		pci_ids = drv->pci_tbl;
+		fprintf(ofd, "\\\"pci_ids\\\" : [");
+
+		while (pci_ids && pci_ids->device_id) {
+			fprintf(ofd, "[%d, %d, %d, %d]",
+				pci_ids->vendor_id, pci_ids->device_id,
+				pci_ids->subsystem_vendor_id,
+				pci_ids->subsystem_device_id);
+			pci_ids++;
+			if (pci_ids->device_id)
+				fprintf(ofd, ",");
+			else
+				fprintf(ofd, " ");
+		}
+		fprintf(ofd, "]}\";");
+		drv = drv->next;
+	}
+
+	fclose(ofd);
+}
+
+int main(int argc, char **argv)
+{
+	struct elf_info info;
+	int rc = 1;
+
+	if (argc < 3) {
+		fprintf(stderr,
+			"usage: pmdinfo <object file> <c output file>\n");
+		exit(127);
+	}
+	parse_elf(&info, argv[1]);
+
+	locate_pmd_entries(&info);
+
+	if (info.drivers) {
+		output_pmd_info_string(&info, argv[2]);
+		rc = 0;
+	} else {
+		fprintf(stderr, "No drivers registered\n");
+	}
+
+	parse_elf_finish(&info);
+	exit(rc);
+}
diff --git a/buildtools/pmdinfogen/pmdinfogen.h b/buildtools/pmdinfogen/pmdinfogen.h
new file mode 100644
index 0000000..1da2966
--- /dev/null
+++ b/buildtools/pmdinfogen/pmdinfogen.h
@@ -0,0 +1,120 @@ 
+
+/* Postprocess pmd object files to export hw support
+ *
+ * Copyright 2016 Neil Horman <nhorman@tuxdriver.com>
+ * Based in part on modpost.c from the linux kernel
+ *
+ * This software may be used and distributed according to the terms
+ * of the GNU General Public License V2, incorporated herein by reference.
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <elf.h>
+#include <rte_config.h>
+#include <rte_pci.h>
+#include <rte_byteorder.h>
+
+/* On BSD-alike OSes elf.h defines these according to host's word size */
+#undef ELF_ST_BIND
+#undef ELF_ST_TYPE
+#undef ELF_R_SYM
+#undef ELF_R_TYPE
+
+/*
+ * Define ELF64_* to ELF_*, the latter being defined in both 32 and 64 bit
+ * flavors in elf.h.  This makes our code a bit more generic between arches
+ * and allows us to support 32 bit code in the future should we ever want to
+ */
+#ifdef RTE_ARCH_64
+#define Elf_Ehdr    Elf64_Ehdr
+#define Elf_Shdr    Elf64_Shdr
+#define Elf_Sym     Elf64_Sym
+#define Elf_Addr    Elf64_Addr
+#define Elf_Sword   Elf64_Sxword
+#define Elf_Section Elf64_Half
+#define ELF_ST_BIND ELF64_ST_BIND
+#define ELF_ST_TYPE ELF64_ST_TYPE
+
+#define Elf_Rel     Elf64_Rel
+#define Elf_Rela    Elf64_Rela
+#define ELF_R_SYM   ELF64_R_SYM
+#define ELF_R_TYPE  ELF64_R_TYPE
+#else
+#define Elf_Ehdr    Elf32_Ehdr
+#define Elf_Shdr    Elf32_Shdr
+#define Elf_Sym     Elf32_Sym
+#define Elf_Addr    Elf32_Addr
+#define Elf_Sword   Elf32_Sxword
+#define Elf_Section Elf32_Half
+#define ELF_ST_BIND ELF32_ST_BIND
+#define ELF_ST_TYPE ELF32_ST_TYPE
+
+#define Elf_Rel     Elf32_Rel
+#define Elf_Rela    Elf32_Rela
+#define ELF_R_SYM   ELF32_R_SYM
+#define ELF_R_TYPE  ELF32_R_TYPE
+#endif
+
+
+/*
+ * Note, it seems odd that we have both a CONVERT_NATIVE and a TO_NATIVE macro
+ * below.  We do this because the values passed to TO_NATIVE may themselves be
+ * macros and need both macros here to get expanded.  Specifically its the width
+ * variable we are concerned with, because it needs to get expanded prior to
+ * string concatenation
+ */
+#define CONVERT_NATIVE(fend, width, x) ({ \
+typeof(x) ___x; \
+if ((fend) == ELFDATA2LSB) \
+	___x = rte_le_to_cpu_##width(x); \
+else \
+	___x = rte_be_to_cpu_##width(x); \
+	___x; \
+})
+
+#define TO_NATIVE(fend, width, x) CONVERT_NATIVE(fend, width, x)
+
+enum opt_params {
+	PMD_PARAM_STRING = 0,
+	PMD_OPT_MAX
+};
+
+struct pmd_driver {
+	Elf_Sym *name_sym;
+	const char *name;
+	struct rte_pci_id *pci_tbl;
+	struct pmd_driver *next;
+
+	const char *opt_vals[PMD_OPT_MAX];
+};
+
+struct elf_info {
+	unsigned long size;
+	Elf_Ehdr     *hdr;
+	Elf_Shdr     *sechdrs;
+	Elf_Sym      *symtab_start;
+	Elf_Sym      *symtab_stop;
+	char         *strtab;
+
+	/* support for 32bit section numbers */
+
+	unsigned int num_sections; /* max_secindex + 1 */
+	unsigned int secindex_strings;
+	/* if Nth symbol table entry has .st_shndx = SHN_XINDEX,
+	 * take shndx from symtab_shndx_start[N] instead
+	 */
+	Elf32_Word   *symtab_shndx_start;
+	Elf32_Word   *symtab_shndx_stop;
+
+	struct pmd_driver *drivers;
+};
+
diff --git a/mk/rte.hostapp.mk b/mk/rte.hostapp.mk
index c44d0f8..07b391c 100644
--- a/mk/rte.hostapp.mk
+++ b/mk/rte.hostapp.mk
@@ -41,7 +41,7 @@  include $(RTE_SDK)/mk/internal/rte.depdirs-pre.mk
 VPATH += $(SRCDIR)
 
 _BUILD = $(HOSTAPP)
-_INSTALL = $(INSTALL-FILES-y) $(SYMLINK-FILES-y) $(RTE_OUTPUT)/hostapp/$(HOSTAPP)
+_INSTALL = $(INSTALL-FILES-y) $(SYMLINK-FILES-y) $(RTE_OUTPUT)/app/$(HOSTAPP)
 _CLEAN = doclean
 
 .PHONY: all
@@ -95,10 +95,10 @@  $(HOSTAPP): $(OBJS-y) $(LDLIBS_FILES) FORCE
 #
 # install app in $(RTE_OUTPUT)/hostapp
 #
-$(RTE_OUTPUT)/hostapp/$(HOSTAPP): $(HOSTAPP)
+$(RTE_OUTPUT)/app/$(HOSTAPP): $(HOSTAPP)
 	@echo "  INSTALL-HOSTAPP $(HOSTAPP)"
-	@[ -d $(RTE_OUTPUT)/hostapp ] || mkdir -p $(RTE_OUTPUT)/hostapp
-	$(Q)cp -f $(HOSTAPP) $(RTE_OUTPUT)/hostapp
+	@[ -d $(RTE_OUTPUT)/app ] || mkdir -p $(RTE_OUTPUT)/app
+	$(Q)cp -f $(HOSTAPP) $(RTE_OUTPUT)/app
 
 #
 # Clean all generated files
diff --git a/mk/rte.sdkbuild.mk b/mk/rte.sdkbuild.mk
index eec5241..fb68af2 100644
--- a/mk/rte.sdkbuild.mk
+++ b/mk/rte.sdkbuild.mk
@@ -64,7 +64,8 @@  build: $(ROOTDIRS-y)
 clean: $(CLEANDIRS)
 	@rm -rf $(RTE_OUTPUT)/include $(RTE_OUTPUT)/app \
 		$(RTE_OUTPUT)/hostapp $(RTE_OUTPUT)/lib \
-		$(RTE_OUTPUT)/hostlib $(RTE_OUTPUT)/kmod
+		$(RTE_OUTPUT)/hostlib $(RTE_OUTPUT)/kmod \
+		$(RTE_OUTPUT)/buildtools
 	@[ -d $(RTE_OUTPUT)/include ] || mkdir -p $(RTE_OUTPUT)/include
 	@$(RTE_SDK)/scripts/gen-config-h.sh $(RTE_OUTPUT)/.config \
 		> $(RTE_OUTPUT)/include/rte_config.h