From: Jiong Wang <jiong.w...@netronome.com>
The current architecture detection method in bpftool is designed for host
case.
For offload case, we can't use the architecture of "bpftool" itself.
Instead, we could call the existing "ifindex_to_name_ns" to get DEVNAME,
then read pci id from /sys/class/dev/DEVNAME/device/vendor, finally we map
vendor id to bfd arch name which will finally be used to select bfd backend
for the disassembler.
Reviewed-by: Jakub Kicinski <jakub.kicin...@netronome.com>
Signed-off-by: Jiong Wang <jiong.w...@netronome.com>
---
tools/bpf/bpftool/common.c | 72 ++++++++++++++++++++++++++++++++++++++++++
tools/bpf/bpftool/jit_disasm.c | 16 +++++++++-
tools/bpf/bpftool/main.h | 5 ++-
tools/bpf/bpftool/prog.c | 12 ++++++-
4 files changed, 102 insertions(+), 3 deletions(-)
diff --git a/tools/bpf/bpftool/common.c b/tools/bpf/bpftool/common.c
index 6601c95a9258..0b482c0070e0 100644
--- a/tools/bpf/bpftool/common.c
+++ b/tools/bpf/bpftool/common.c
@@ -34,6 +34,7 @@
/* Author: Jakub Kicinski <kubak...@wp.pl> */
#include <errno.h>
+#include <fcntl.h>
#include <fts.h>
#include <libgen.h>
#include <mntent.h>
@@ -433,6 +434,77 @@ ifindex_to_name_ns(__u32 ifindex, __u32 ns_dev, __u32
ns_ino, char *buf)
return if_indextoname(ifindex, buf);
}
+static int read_sysfs_hex_int(char *path)
+{
+ char vendor_id_buf[8];
+ int len;
+ int fd;
+
+ fd = open(path, O_RDONLY);
+ if (fd < 0) {
+ p_err("Can't open %s: %s", path, strerror(errno));
+ return -1;
+ }
+
+ len = read(fd, vendor_id_buf, sizeof(vendor_id_buf));
+ close(fd);
+ if (len < 0) {
+ p_err("Can't read %s: %s", path, strerror(errno));
+ return -1;
+ }
+ if (len >= (int)sizeof(vendor_id_buf)) {
+ p_err("Value in %s too long", path);
+ return -1;
+ }
+
+ vendor_id_buf[len] = 0;
+
+ return strtol(vendor_id_buf, NULL, 0);
+}
+
+static int read_sysfs_netdev_hex_int(char *devname, const char *entry_name)
+{
+ char full_path[64];
+
+ snprintf(full_path, sizeof(full_path), "/sys/class/net/%s/device/%s",
+ devname, entry_name);
+
+ return read_sysfs_hex_int(full_path);
+}
+
+const char *ifindex_to_bfd_name_ns(__u32 ifindex, __u64 ns_dev, __u64 ns_ino)
+{
+ char devname[IF_NAMESIZE];
+ int vendor_id;
+ int device_id;
+
+ if (!ifindex_to_name_ns(ifindex, ns_dev, ns_ino, devname)) {
+ p_err("Can't get net device name for ifindex %d: %s", ifindex,
+ strerror(errno));
+ return NULL;
+ }
+
+ vendor_id = read_sysfs_netdev_hex_int(devname, "vendor");
+ if (vendor_id < 0) {
+ p_err("Can't get device vendor id for %s", devname);
+ return NULL;
+ }
+
+ switch (vendor_id) {
+ case 0x19ee:
+ device_id = read_sysfs_netdev_hex_int(devname, "device");
+ if (device_id != 0x4000 &&
+ device_id != 0x6000 &&
+ device_id != 0x6003)
+ p_info("Unknown NFP device ID, assuming it is NFP-6xxx
arch");
+ return "NFP-6xxx";
+ default:
+ p_err("Can't get bfd arch name for device vendor id 0x%04x",
+ vendor_id);
+ return NULL;
+ }
+}
+
void print_dev_plain(__u32 ifindex, __u64 ns_dev, __u64 ns_inode)
{
char name[IF_NAMESIZE];
diff --git a/tools/bpf/bpftool/jit_disasm.c b/tools/bpf/bpftool/jit_disasm.c
index 57d32e8a1391..87439320ef70 100644
--- a/tools/bpf/bpftool/jit_disasm.c
+++ b/tools/bpf/bpftool/jit_disasm.c
@@ -76,7 +76,8 @@ static int fprintf_json(void *out, const char *fmt, ...)
return 0;
}
-void disasm_print_insn(unsigned char *image, ssize_t len, int opcodes)
+void disasm_print_insn(unsigned char *image, ssize_t len, int opcodes,
+ const char *arch)
{
disassembler_ftype disassemble;
struct disassemble_info info;
@@ -100,6 +101,19 @@ void disasm_print_insn(unsigned char *image, ssize_t len,
int opcodes)
else
init_disassemble_info(&info, stdout,
(fprintf_ftype) fprintf);
+
+ /* Update architecture info for offload. */
+ if (arch) {
+ const bfd_arch_info_type *inf = bfd_scan_arch(arch);
+
+ if (inf) {
+ bfdf->arch_info = inf;
+ } else {
+ p_err("No libfd support for %s", arch);
+ return;
+ }
+ }
+
info.arch = bfd_get_arch(bfdf);
info.mach = bfd_get_mach(bfdf);
info.buffer = image;
diff --git a/tools/bpf/bpftool/main.h b/tools/bpf/bpftool/main.h
index 65b526fe6e7e..b8e9584d6246 100644
--- a/tools/bpf/bpftool/main.h
+++ b/tools/bpf/bpftool/main.h
@@ -121,7 +121,10 @@ int do_cgroup(int argc, char **arg);
int prog_parse_fd(int *argc, char ***argv);
-void disasm_print_insn(unsigned char *image, ssize_t len, int opcodes);
+void disasm_print_insn(unsigned char *image, ssize_t len, int opcodes,
+ const char *arch);
void print_hex_data_json(uint8_t *data, size_t len);
+const char *ifindex_to_bfd_name_ns(__u32 ifindex, __u64 ns_dev, __u64 ns_ino);
+
#endif
diff --git a/tools/bpf/bpftool/prog.c b/tools/bpf/bpftool/prog.c
index 099e21cf1b5c..e8e2baaf93c2 100644
--- a/tools/bpf/bpftool/prog.c
+++ b/tools/bpf/bpftool/prog.c
@@ -776,7 +776,17 @@ static int do_dump(int argc, char **argv)
}
} else {
if (member_len == &info.jited_prog_len) {
- disasm_print_insn(buf, *member_len, opcodes);
+ const char *name = NULL;
+
+ if (info.ifindex) {
+ name = ifindex_to_bfd_name_ns(info.ifindex,
+ info.netns_dev,
+ info.netns_ino);
+ if (!name)
+ goto err_free;
+ }
+
+ disasm_print_insn(buf, *member_len, opcodes, name);
} else {
kernel_syms_load(&dd);
if (json_output)
--
2.15.1
