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Message-ID: <20220502213705.1170077-1-ctakshak@fb.com>
Date: Mon, 2 May 2022 14:37:04 -0700
From: Takshak Chahande <ctakshak@...com>
To: <netdev@...r.kernel.org>, <bpf@...r.kernel.org>
CC: <andrii@...nel.org>, <ast@...nel.org>, <ctakshak@...com>,
<ndixit@...com>, <kafai@...com>, <andriin@...com>,
<daniel@...earbox.net>, <yhs@...com>
Subject: [PATCH bpf-next v4 1/2] bpf: Extend batch operations for map-in-map bpf-maps
This patch extends batch operations support for map-in-map map-types:
BPF_MAP_TYPE_HASH_OF_MAPS and BPF_MAP_TYPE_ARRAY_OF_MAPS
A usecase where outer HASH map holds hundred of VIP entries and its
associated reuse-ports per VIP stored in REUSEPORT_SOCKARRAY type
inner map, needs to do batch operation for performance gain.
This patch leverages the exiting generic functions for most of the batch
operations. As map-in-map's value contains the actual reference of the inner map,
for BPF_MAP_TYPE_HASH_OF_MAPS type, it needed an extra step to fetch the
map_id from the reference value.
selftests are added in next patch 2/2.
Signed-off-by: Takshak Chahande <ctakshak@...com>
Acked-by: Yonghong Song <yhs@...com>
---
kernel/bpf/arraymap.c | 2 ++
kernel/bpf/hashtab.c | 13 +++++++++++--
2 files changed, 13 insertions(+), 2 deletions(-)
v3->v4:
- Added blank line between var declaration and actual code block (Yonghong)
v1->v3:
- Changes in selftest/bpf patch 2/2
diff --git a/kernel/bpf/arraymap.c b/kernel/bpf/arraymap.c
index b3bf31fd9458..724613da6576 100644
--- a/kernel/bpf/arraymap.c
+++ b/kernel/bpf/arraymap.c
@@ -1345,6 +1345,8 @@ const struct bpf_map_ops array_of_maps_map_ops = {
.map_fd_put_ptr = bpf_map_fd_put_ptr,
.map_fd_sys_lookup_elem = bpf_map_fd_sys_lookup_elem,
.map_gen_lookup = array_of_map_gen_lookup,
+ .map_lookup_batch = generic_map_lookup_batch,
+ .map_update_batch = generic_map_update_batch,
.map_check_btf = map_check_no_btf,
.map_btf_id = &array_map_btf_ids[0],
};
diff --git a/kernel/bpf/hashtab.c b/kernel/bpf/hashtab.c
index 3e00e62b2218..705841279d16 100644
--- a/kernel/bpf/hashtab.c
+++ b/kernel/bpf/hashtab.c
@@ -140,7 +140,7 @@ static inline bool htab_use_raw_lock(const struct bpf_htab *htab)
static void htab_init_buckets(struct bpf_htab *htab)
{
- unsigned i;
+ unsigned int i;
for (i = 0; i < htab->n_buckets; i++) {
INIT_HLIST_NULLS_HEAD(&htab->buckets[i].head, i);
@@ -1627,7 +1627,7 @@ __htab_map_lookup_and_delete_batch(struct bpf_map *map,
void __user *uvalues = u64_to_user_ptr(attr->batch.values);
void __user *ukeys = u64_to_user_ptr(attr->batch.keys);
void __user *ubatch = u64_to_user_ptr(attr->batch.in_batch);
- u32 batch, max_count, size, bucket_size;
+ u32 batch, max_count, size, bucket_size, map_id;
struct htab_elem *node_to_free = NULL;
u64 elem_map_flags, map_flags;
struct hlist_nulls_head *head;
@@ -1752,6 +1752,14 @@ __htab_map_lookup_and_delete_batch(struct bpf_map *map,
}
} else {
value = l->key + roundup_key_size;
+ if (map->map_type == BPF_MAP_TYPE_HASH_OF_MAPS) {
+ struct bpf_map **inner_map = value;
+
+ /* Actual value is the id of the inner map */
+ map_id = map->ops->map_fd_sys_lookup_elem(*inner_map);
+ value = &map_id;
+ }
+
if (elem_map_flags & BPF_F_LOCK)
copy_map_value_locked(map, dst_val, value,
true);
@@ -2450,5 +2458,6 @@ const struct bpf_map_ops htab_of_maps_map_ops = {
.map_fd_sys_lookup_elem = bpf_map_fd_sys_lookup_elem,
.map_gen_lookup = htab_of_map_gen_lookup,
.map_check_btf = map_check_no_btf,
+ BATCH_OPS(htab),
.map_btf_id = &htab_map_btf_ids[0],
};
--
2.30.2
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