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bpf/vmtest-bpf-next-PR |
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bpf/vmtest-bpf-next-VM_Test-0 |
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bpf/vmtest-bpf-next-VM_Test-38 |
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bpf/vmtest-bpf-next-VM_Test-39 |
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bpf/vmtest-bpf-next-VM_Test-40 |
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bpf/vmtest-bpf-next-VM_Test-41 |
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bpf/vmtest-bpf-next-VM_Test-42 |
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Logs for x86_64-llvm-18 / veristat
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@@ -1612,6 +1612,7 @@ struct bpf_link_ops {
struct bpf_link_info *info);
int (*update_map)(struct bpf_link *link, struct bpf_map *new_map,
struct bpf_map *old_map);
+ __poll_t (*poll)(struct file *file, struct poll_table_struct *pts);
};
struct bpf_tramp_link {
@@ -12,6 +12,7 @@
#include <linux/mutex.h>
#include <linux/btf_ids.h>
#include <linux/rcupdate_wait.h>
+#include <linux/poll.h>
struct bpf_struct_ops_value {
struct bpf_struct_ops_common_value common;
@@ -56,6 +57,7 @@ struct bpf_struct_ops_map {
struct bpf_struct_ops_link {
struct bpf_link link;
struct bpf_map __rcu *map;
+ wait_queue_head_t wait_hup;
};
static DEFINE_MUTEX(update_mutex);
@@ -1167,15 +1169,28 @@ static int bpf_struct_ops_map_link_detach(struct bpf_link *link)
mutex_unlock(&update_mutex);
+ wake_up_interruptible_poll(&st_link->wait_hup, EPOLLHUP);
+
return 0;
}
+static __poll_t bpf_struct_ops_map_link_poll(struct file *file,
+ struct poll_table_struct *pts)
+{
+ struct bpf_struct_ops_link *st_link = file->private_data;
+
+ poll_wait(file, &st_link->wait_hup, pts);
+
+ return (st_link->map) ? 0 : EPOLLHUP;
+}
+
static const struct bpf_link_ops bpf_struct_ops_map_lops = {
.dealloc = bpf_struct_ops_map_link_dealloc,
.detach = bpf_struct_ops_map_link_detach,
.show_fdinfo = bpf_struct_ops_map_link_show_fdinfo,
.fill_link_info = bpf_struct_ops_map_link_fill_link_info,
.update_map = bpf_struct_ops_map_link_update,
+ .poll = bpf_struct_ops_map_link_poll,
};
int bpf_struct_ops_link_create(union bpf_attr *attr)
@@ -1213,6 +1228,8 @@ int bpf_struct_ops_link_create(union bpf_attr *attr)
*/
RCU_INIT_POINTER(link->map, map);
+ init_waitqueue_head(&link->wait_hup);
+
err = st_map->st_ops_desc->st_ops->reg(st_map->kvalue.data, &link->link);
if (err) {
rcu_assign_pointer(link->map, NULL);
@@ -3150,6 +3150,16 @@ static void bpf_link_show_fdinfo(struct seq_file *m, struct file *filp)
}
#endif
+static __poll_t bpf_link_poll(struct file *file, struct poll_table_struct *pts)
+{
+ struct bpf_link *link = file->private_data;
+
+ if (link->ops->poll)
+ return link->ops->poll(file, pts);
+
+ return 0;
+}
+
static const struct file_operations bpf_link_fops = {
#ifdef CONFIG_PROC_FS
.show_fdinfo = bpf_link_show_fdinfo,
@@ -3157,6 +3167,7 @@ static const struct file_operations bpf_link_fops = {
.release = bpf_link_release,
.read = bpf_dummy_read,
.write = bpf_dummy_write,
+ .poll = bpf_link_poll,
};
static int bpf_link_alloc_id(struct bpf_link *link)
Add epoll support to bpf struct_ops links to trigger EPOLLHUP event upon detachment. Signed-off-by: Kui-Feng Lee <thinker.li@gmail.com> --- include/linux/bpf.h | 1 + kernel/bpf/bpf_struct_ops.c | 17 +++++++++++++++++ kernel/bpf/syscall.c | 11 +++++++++++ 3 files changed, 29 insertions(+)