From: "Björn Töpel" <bjorn.topel@gmail.com>
To: netdev@vger.kernel.org, ast@kernel.org, daniel@iogearbox.net,
jakub.kicinski@netronome.com
Cc: "Björn Töpel" <bjorn.topel@intel.com>,
bpf@vger.kernel.org, magnus.karlsson@gmail.com,
magnus.karlsson@intel.com, maciej.fijalkowski@intel.com,
jonathan.lemon@gmail.com, toke@redhat.com
Subject: [PATCH bpf-next v3 1/2] xsk: store struct xdp_sock as a flexible array member of the XSKMAP
Date: Fri, 25 Oct 2019 11:32:18 +0200 [thread overview]
Message-ID: <20191025093219.10290-2-bjorn.topel@gmail.com> (raw)
In-Reply-To: <20191025093219.10290-1-bjorn.topel@gmail.com>
From: Björn Töpel <bjorn.topel@intel.com>
Prior this commit, the array storing XDP socket instances were stored
in a separate allocated array of the XSKMAP. Now, we store the sockets
as a flexible array member in a similar fashion as the arraymap. Doing
so, we do less pointer chasing in the lookup.
Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
---
kernel/bpf/xskmap.c | 55 +++++++++++++++++++--------------------------
1 file changed, 23 insertions(+), 32 deletions(-)
diff --git a/kernel/bpf/xskmap.c b/kernel/bpf/xskmap.c
index 82a1ffe15dfa..a83e92fe2971 100644
--- a/kernel/bpf/xskmap.c
+++ b/kernel/bpf/xskmap.c
@@ -11,9 +11,9 @@
struct xsk_map {
struct bpf_map map;
- struct xdp_sock **xsk_map;
struct list_head __percpu *flush_list;
spinlock_t lock; /* Synchronize map updates */
+ struct xdp_sock *xsk_map[];
};
int xsk_map_inc(struct xsk_map *map)
@@ -80,9 +80,10 @@ static void xsk_map_sock_delete(struct xdp_sock *xs,
static struct bpf_map *xsk_map_alloc(union bpf_attr *attr)
{
+ struct bpf_map_memory mem;
+ int cpu, err, numa_node;
struct xsk_map *m;
- int cpu, err;
- u64 cost;
+ size_t cost, size;
if (!capable(CAP_NET_ADMIN))
return ERR_PTR(-EPERM);
@@ -92,44 +93,35 @@ static struct bpf_map *xsk_map_alloc(union bpf_attr *attr)
attr->map_flags & ~(BPF_F_NUMA_NODE | BPF_F_RDONLY | BPF_F_WRONLY))
return ERR_PTR(-EINVAL);
- m = kzalloc(sizeof(*m), GFP_USER);
- if (!m)
+ numa_node = bpf_map_attr_numa_node(attr);
+ size = struct_size(m, xsk_map, attr->max_entries);
+ cost = size + array_size(sizeof(*m->flush_list), num_possible_cpus());
+
+ err = bpf_map_charge_init(&mem, cost);
+ if (err < 0)
+ return ERR_PTR(err);
+
+ m = bpf_map_area_alloc(size, numa_node);
+ if (!m) {
+ bpf_map_charge_finish(&mem);
return ERR_PTR(-ENOMEM);
+ }
bpf_map_init_from_attr(&m->map, attr);
+ bpf_map_charge_move(&m->map.memory, &mem);
spin_lock_init(&m->lock);
- cost = (u64)m->map.max_entries * sizeof(struct xdp_sock *);
- cost += sizeof(struct list_head) * num_possible_cpus();
-
- /* Notice returns -EPERM on if map size is larger than memlock limit */
- err = bpf_map_charge_init(&m->map.memory, cost);
- if (err)
- goto free_m;
-
- err = -ENOMEM;
-
m->flush_list = alloc_percpu(struct list_head);
- if (!m->flush_list)
- goto free_charge;
+ if (!m->flush_list) {
+ bpf_map_charge_finish(&m->map.memory);
+ bpf_map_area_free(m);
+ return ERR_PTR(-ENOMEM);
+ }
for_each_possible_cpu(cpu)
INIT_LIST_HEAD(per_cpu_ptr(m->flush_list, cpu));
- m->xsk_map = bpf_map_area_alloc(m->map.max_entries *
- sizeof(struct xdp_sock *),
- m->map.numa_node);
- if (!m->xsk_map)
- goto free_percpu;
return &m->map;
-
-free_percpu:
- free_percpu(m->flush_list);
-free_charge:
- bpf_map_charge_finish(&m->map.memory);
-free_m:
- kfree(m);
- return ERR_PTR(err);
}
static void xsk_map_free(struct bpf_map *map)
@@ -139,8 +131,7 @@ static void xsk_map_free(struct bpf_map *map)
bpf_clear_redirect_map(map);
synchronize_net();
free_percpu(m->flush_list);
- bpf_map_area_free(m->xsk_map);
- kfree(m);
+ bpf_map_area_free(m);
}
static int xsk_map_get_next_key(struct bpf_map *map, void *key, void *next_key)
--
2.20.1
next prev parent reply other threads:[~2019-10-25 9:32 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-25 9:32 [PATCH bpf-next v3 0/2] xsk: XSKMAP lookup improvements Björn Töpel
2019-10-25 9:32 ` Björn Töpel [this message]
2019-10-25 18:18 ` [PATCH bpf-next v3 1/2] xsk: store struct xdp_sock as a flexible array member of the XSKMAP Jonathan Lemon
2019-10-28 18:00 ` Jakub Kicinski
2019-10-28 20:54 ` Björn Töpel
2019-10-25 9:32 ` [PATCH bpf-next v3 2/2] bpf: implement map_gen_lookup() callback for XSKMAP Björn Töpel
2019-10-25 18:19 ` Jonathan Lemon
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