Currently bpf_iter_reg_target takes parameters from target
and allocates memory to save them. This is really not
necessary, esp. in the future we may grow information
passed from targets to bpf_iter manager.
The patch refactors the code so target reg_info
becomes static and bpf_iter manager can just take
a reference to it.
Signed-off-by: Yonghong Song <yhs@xxxxxx>
---
kernel/bpf/bpf_iter.c | 29 +++++++++++------------------
kernel/bpf/map_iter.c | 18 +++++++++---------
kernel/bpf/task_iter.c | 30 ++++++++++++++++--------------
net/ipv6/route.c | 18 +++++++++---------
net/netlink/af_netlink.c | 18 +++++++++---------
5 files changed, 54 insertions(+), 59 deletions(-)
diff --git a/kernel/bpf/bpf_iter.c b/kernel/bpf/bpf_iter.c
index b0c8b3bdf3b0..1d203dc7afe2 100644
--- a/kernel/bpf/bpf_iter.c
+++ b/kernel/bpf/bpf_iter.c
@@ -8,11 +8,7 @@
struct bpf_iter_target_info {
struct list_head list;
- const char *target;
- const struct seq_operations *seq_ops;
- bpf_iter_init_seq_priv_t init_seq_private;
- bpf_iter_fini_seq_priv_t fini_seq_private;
- u32 seq_priv_size;
+ struct bpf_iter_reg *reg_info;
u32 btf_id; /* cached value */
};
@@ -224,8 +220,8 @@ static int iter_release(struct inode *inode, struct file *file)
iter_priv = container_of(seq->private, struct bpf_iter_priv_data,
target_private);
- if (iter_priv->tinfo->fini_seq_private)
- iter_priv->tinfo->fini_seq_private(seq->private);
+ if (iter_priv->tinfo->reg_info->fini_seq_private)
+ iter_priv->tinfo->reg_info->fini_seq_private(seq->private);
bpf_prog_put(iter_priv->prog);
seq->private = iter_priv;
@@ -248,11 +244,7 @@ int bpf_iter_reg_target(struct bpf_iter_reg *reg_info)
if (!tinfo)
return -ENOMEM;
- tinfo->target = reg_info->target;
- tinfo->seq_ops = reg_info->seq_ops;
- tinfo->init_seq_private = reg_info->init_seq_private;
- tinfo->fini_seq_private = reg_info->fini_seq_private;
- tinfo->seq_priv_size = reg_info->seq_priv_size;
+ tinfo->reg_info = reg_info;
INIT_LIST_HEAD(&tinfo->list);
mutex_lock(&targets_mutex);
@@ -269,7 +261,7 @@ void bpf_iter_unreg_target(const char *target)
mutex_lock(&targets_mutex);
list_for_each_entry(tinfo, &targets, list) {
- if (!strcmp(target, tinfo->target)) {
+ if (!strcmp(target, tinfo->reg_info->target)) {
list_del(&tinfo->list);
kfree(tinfo);
found = true;
@@ -305,7 +297,7 @@ bool bpf_iter_prog_supported(struct bpf_prog *prog)
supported = true;
break;
}
- if (!strcmp(attach_fname + prefix_len, tinfo->target)) {
+ if (!strcmp(attach_fname + prefix_len, tinfo->reg_info->target)) {
cache_btf_id(tinfo, prog);
supported = true;
break;
@@ -433,15 +425,16 @@ static int prepare_seq_file(struct file *file, struct bpf_iter_link *link)
tinfo = link->tinfo;
total_priv_dsize = offsetof(struct bpf_iter_priv_data, target_private) +
- tinfo->seq_priv_size;
- priv_data = __seq_open_private(file, tinfo->seq_ops, total_priv_dsize);
+ tinfo->reg_info->seq_priv_size;
+ priv_data = __seq_open_private(file, tinfo->reg_info->seq_ops,
+ total_priv_dsize);
if (!priv_data) {
err = -ENOMEM;
goto release_prog;
}
- if (tinfo->init_seq_private) {
- err = tinfo->init_seq_private(priv_data->target_private);
+ if (tinfo->reg_info->init_seq_private) {
+ err = tinfo->reg_info->init_seq_private(priv_data->target_private);
if (err)
goto release_seq_file;
}
diff --git a/kernel/bpf/map_iter.c b/kernel/bpf/map_iter.c
index 8162e0c00b9f..545c7dbb13c9 100644
--- a/kernel/bpf/map_iter.c
+++ b/kernel/bpf/map_iter.c
@@ -81,17 +81,17 @@ static const struct seq_operations bpf_map_seq_ops = {
.show = bpf_map_seq_show,
};
+static struct bpf_iter_reg bpf_map_reg_info = {
+ .target = "bpf_map",
+ .seq_ops = &bpf_map_seq_ops,
+ .init_seq_private = NULL,
+ .fini_seq_private = NULL,
+ .seq_priv_size = sizeof(struct bpf_iter_seq_map_info),
+};
+
static int __init bpf_map_iter_init(void)
{
- struct bpf_iter_reg reg_info = {
- .target = "bpf_map",
- .seq_ops = &bpf_map_seq_ops,
- .init_seq_private = NULL,
- .fini_seq_private = NULL,
- .seq_priv_size = sizeof(struct bpf_iter_seq_map_info),
- };
-
- return bpf_iter_reg_target(®_info);
+ return bpf_iter_reg_target(&bpf_map_reg_info);
}
late_initcall(bpf_map_iter_init);
diff --git a/kernel/bpf/task_iter.c b/kernel/bpf/task_iter.c
index aeed662d8451..ed0b1d6ce688 100644
--- a/kernel/bpf/task_iter.c
+++ b/kernel/bpf/task_iter.c
@@ -306,22 +306,24 @@ static const struct seq_operations task_file_seq_ops = {
.show = task_file_seq_show,
};
+static struct bpf_iter_reg task_reg_info = {
+ .target = "task",
+ .seq_ops = &task_seq_ops,
+ .init_seq_private = init_seq_pidns,
+ .fini_seq_private = fini_seq_pidns,
+ .seq_priv_size = sizeof(struct bpf_iter_seq_task_info),
+};
+
+static struct bpf_iter_reg task_file_reg_info = {
+ .target = "task_file",
+ .seq_ops = &task_file_seq_ops,
+ .init_seq_private = init_seq_pidns,
+ .fini_seq_private = fini_seq_pidns,
+ .seq_priv_size = sizeof(struct bpf_iter_seq_task_file_info),
+};
+
static int __init task_iter_init(void)
{
- struct bpf_iter_reg task_file_reg_info = {
- .target = "task_file",
- .seq_ops = &task_file_seq_ops,
- .init_seq_private = init_seq_pidns,
- .fini_seq_private = fini_seq_pidns,
- .seq_priv_size = sizeof(struct bpf_iter_seq_task_file_info),
- };
- struct bpf_iter_reg task_reg_info = {
- .target = "task",
- .seq_ops = &task_seq_ops,
- .init_seq_private = init_seq_pidns,
- .fini_seq_private = fini_seq_pidns,
- .seq_priv_size = sizeof(struct bpf_iter_seq_task_info),
- };
int ret;
ret = bpf_iter_reg_target(&task_reg_info);
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 25f6d3e619d0..48e8752d9ad9 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -6397,17 +6397,17 @@ void __init ip6_route_init_special_entries(void)
#if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_PROC_FS)
DEFINE_BPF_ITER_FUNC(ipv6_route, struct bpf_iter_meta *meta, struct fib6_info *rt)
+static struct bpf_iter_reg ipv6_route_reg_info = {
+ .target = "ipv6_route",
+ .seq_ops = &ipv6_route_seq_ops,
+ .init_seq_private = bpf_iter_init_seq_net,
+ .fini_seq_private = bpf_iter_fini_seq_net,
+ .seq_priv_size = sizeof(struct ipv6_route_iter),
+};
+
static int __init bpf_iter_register(void)
{
- struct bpf_iter_reg reg_info = {
- .target = "ipv6_route",
- .seq_ops = &ipv6_route_seq_ops,
- .init_seq_private = bpf_iter_init_seq_net,
- .fini_seq_private = bpf_iter_fini_seq_net,
- .seq_priv_size = sizeof(struct ipv6_route_iter),
- };
-
- return bpf_iter_reg_target(®_info);
+ return bpf_iter_reg_target(&ipv6_route_reg_info);
}
static void bpf_iter_unregister(void)
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 33cda9baa979..1e2f5ab8c7d7 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -2803,17 +2803,17 @@ static const struct rhashtable_params netlink_rhashtable_params = {
};
#if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_PROC_FS)
+static struct bpf_iter_reg netlink_reg_info = {
+ .target = "netlink",
+ .seq_ops = &netlink_seq_ops,
+ .init_seq_private = bpf_iter_init_seq_net,
+ .fini_seq_private = bpf_iter_fini_seq_net,
+ .seq_priv_size = sizeof(struct nl_seq_iter),
+};
+
static int __init bpf_iter_register(void)
{
- struct bpf_iter_reg reg_info = {
- .target = "netlink",
- .seq_ops = &netlink_seq_ops,
- .init_seq_private = bpf_iter_init_seq_net,
- .fini_seq_private = bpf_iter_fini_seq_net,
- .seq_priv_size = sizeof(struct nl_seq_iter),
- };
-
- return bpf_iter_reg_target(®_info);
+ return bpf_iter_reg_target(&netlink_reg_info);
}
#endif
--
2.24.1
