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Message-Id: <20220103150812.87914-5-toke@redhat.com>
Date: Mon, 3 Jan 2022 16:08:09 +0100
From: Toke Høiland-Jørgensen <toke@...hat.com>
To: Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Andrii Nakryiko <andrii@...nel.org>,
Martin KaFai Lau <kafai@...com>,
Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
John Fastabend <john.fastabend@...il.com>,
KP Singh <kpsingh@...nel.org>,
"David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Jesper Dangaard Brouer <hawk@...nel.org>
Cc: Toke Høiland-Jørgensen <toke@...hat.com>,
netdev@...r.kernel.org, bpf@...r.kernel.org
Subject: [PATCH bpf-next v5 4/7] xdp: Move conversion to xdp_frame out of map functions
All map redirect functions except XSK maps convert xdp_buff to xdp_frame
before enqueueing it. So move this conversion of out the map functions
and into xdp_do_redirect(). This removes a bit of duplicated code, but more
importantly it makes it possible to support caller-allocated xdp_frame
structures, which will be added in a subsequent commit.
Signed-off-by: Toke Høiland-Jørgensen <toke@...hat.com>
---
include/linux/bpf.h | 20 ++++++++++----------
kernel/bpf/cpumap.c | 8 +-------
kernel/bpf/devmap.c | 32 +++++++++++---------------------
net/core/filter.c | 24 +++++++++++++++++-------
4 files changed, 39 insertions(+), 45 deletions(-)
diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index 26753139d5b4..6e947cd91152 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -1669,17 +1669,17 @@ void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth);
struct btf *bpf_get_btf_vmlinux(void);
/* Map specifics */
-struct xdp_buff;
+struct xdp_frame;
struct sk_buff;
struct bpf_dtab_netdev;
struct bpf_cpu_map_entry;
void __dev_flush(void);
-int dev_xdp_enqueue(struct net_device *dev, struct xdp_buff *xdp,
+int dev_xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf,
struct net_device *dev_rx);
-int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp,
+int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_frame *xdpf,
struct net_device *dev_rx);
-int dev_map_enqueue_multi(struct xdp_buff *xdp, struct net_device *dev_rx,
+int dev_map_enqueue_multi(struct xdp_frame *xdpf, struct net_device *dev_rx,
struct bpf_map *map, bool exclude_ingress);
int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb,
struct bpf_prog *xdp_prog);
@@ -1688,7 +1688,7 @@ int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb,
bool exclude_ingress);
void __cpu_map_flush(void);
-int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_buff *xdp,
+int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_frame *xdpf,
struct net_device *dev_rx);
int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu,
struct sk_buff *skb);
@@ -1866,26 +1866,26 @@ static inline void __dev_flush(void)
{
}
-struct xdp_buff;
+struct xdp_frame;
struct bpf_dtab_netdev;
struct bpf_cpu_map_entry;
static inline
-int dev_xdp_enqueue(struct net_device *dev, struct xdp_buff *xdp,
+int dev_xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf,
struct net_device *dev_rx)
{
return 0;
}
static inline
-int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp,
+int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_frame *xdpf,
struct net_device *dev_rx)
{
return 0;
}
static inline
-int dev_map_enqueue_multi(struct xdp_buff *xdp, struct net_device *dev_rx,
+int dev_map_enqueue_multi(struct xdp_frame *xdpf, struct net_device *dev_rx,
struct bpf_map *map, bool exclude_ingress)
{
return 0;
@@ -1913,7 +1913,7 @@ static inline void __cpu_map_flush(void)
}
static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu,
- struct xdp_buff *xdp,
+ struct xdp_frame *xdpf,
struct net_device *dev_rx)
{
return 0;
diff --git a/kernel/bpf/cpumap.c b/kernel/bpf/cpumap.c
index 0421061d95f1..b3e6b9422238 100644
--- a/kernel/bpf/cpumap.c
+++ b/kernel/bpf/cpumap.c
@@ -746,15 +746,9 @@ static void bq_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_frame *xdpf)
list_add(&bq->flush_node, flush_list);
}
-int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_buff *xdp,
+int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_frame *xdpf,
struct net_device *dev_rx)
{
- struct xdp_frame *xdpf;
-
- xdpf = xdp_convert_buff_to_frame(xdp);
- if (unlikely(!xdpf))
- return -EOVERFLOW;
-
/* Info needed when constructing SKB on remote CPU */
xdpf->dev_rx = dev_rx;
diff --git a/kernel/bpf/devmap.c b/kernel/bpf/devmap.c
index 6feea293ff10..fe019dbdb3f0 100644
--- a/kernel/bpf/devmap.c
+++ b/kernel/bpf/devmap.c
@@ -467,24 +467,19 @@ static void bq_enqueue(struct net_device *dev, struct xdp_frame *xdpf,
bq->q[bq->count++] = xdpf;
}
-static inline int __xdp_enqueue(struct net_device *dev, struct xdp_buff *xdp,
+static inline int __xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf,
struct net_device *dev_rx,
struct bpf_prog *xdp_prog)
{
- struct xdp_frame *xdpf;
int err;
if (!dev->netdev_ops->ndo_xdp_xmit)
return -EOPNOTSUPP;
- err = xdp_ok_fwd_dev(dev, xdp->data_end - xdp->data);
+ err = xdp_ok_fwd_dev(dev, xdpf->len);
if (unlikely(err))
return err;
- xdpf = xdp_convert_buff_to_frame(xdp);
- if (unlikely(!xdpf))
- return -EOVERFLOW;
-
bq_enqueue(dev, xdpf, dev_rx, xdp_prog);
return 0;
}
@@ -520,27 +515,27 @@ static u32 dev_map_bpf_prog_run_skb(struct sk_buff *skb, struct bpf_dtab_netdev
return act;
}
-int dev_xdp_enqueue(struct net_device *dev, struct xdp_buff *xdp,
+int dev_xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf,
struct net_device *dev_rx)
{
- return __xdp_enqueue(dev, xdp, dev_rx, NULL);
+ return __xdp_enqueue(dev, xdpf, dev_rx, NULL);
}
-int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp,
+int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_frame *xdpf,
struct net_device *dev_rx)
{
struct net_device *dev = dst->dev;
- return __xdp_enqueue(dev, xdp, dev_rx, dst->xdp_prog);
+ return __xdp_enqueue(dev, xdpf, dev_rx, dst->xdp_prog);
}
-static bool is_valid_dst(struct bpf_dtab_netdev *obj, struct xdp_buff *xdp)
+static bool is_valid_dst(struct bpf_dtab_netdev *obj, struct xdp_frame *xdpf)
{
if (!obj ||
!obj->dev->netdev_ops->ndo_xdp_xmit)
return false;
- if (xdp_ok_fwd_dev(obj->dev, xdp->data_end - xdp->data))
+ if (xdp_ok_fwd_dev(obj->dev, xdpf->len))
return false;
return true;
@@ -586,14 +581,13 @@ static int get_upper_ifindexes(struct net_device *dev, int *indexes)
return n;
}
-int dev_map_enqueue_multi(struct xdp_buff *xdp, struct net_device *dev_rx,
+int dev_map_enqueue_multi(struct xdp_frame *xdpf, struct net_device *dev_rx,
struct bpf_map *map, bool exclude_ingress)
{
struct bpf_dtab *dtab = container_of(map, struct bpf_dtab, map);
struct bpf_dtab_netdev *dst, *last_dst = NULL;
int excluded_devices[1+MAX_NEST_DEV];
struct hlist_head *head;
- struct xdp_frame *xdpf;
int num_excluded = 0;
unsigned int i;
int err;
@@ -603,15 +597,11 @@ int dev_map_enqueue_multi(struct xdp_buff *xdp, struct net_device *dev_rx,
excluded_devices[num_excluded++] = dev_rx->ifindex;
}
- xdpf = xdp_convert_buff_to_frame(xdp);
- if (unlikely(!xdpf))
- return -EOVERFLOW;
-
if (map->map_type == BPF_MAP_TYPE_DEVMAP) {
for (i = 0; i < map->max_entries; i++) {
dst = rcu_dereference_check(dtab->netdev_map[i],
rcu_read_lock_bh_held());
- if (!is_valid_dst(dst, xdp))
+ if (!is_valid_dst(dst, xdpf))
continue;
if (is_ifindex_excluded(excluded_devices, num_excluded, dst->dev->ifindex))
@@ -634,7 +624,7 @@ int dev_map_enqueue_multi(struct xdp_buff *xdp, struct net_device *dev_rx,
head = dev_map_index_hash(dtab, i);
hlist_for_each_entry_rcu(dst, head, index_hlist,
lockdep_is_held(&dtab->index_lock)) {
- if (!is_valid_dst(dst, xdp))
+ if (!is_valid_dst(dst, xdpf))
continue;
if (is_ifindex_excluded(excluded_devices, num_excluded,
diff --git a/net/core/filter.c b/net/core/filter.c
index 606ab5a98a1a..81b57ea9ad35 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -3964,12 +3964,24 @@ int xdp_do_redirect(struct net_device *dev, struct xdp_buff *xdp,
enum bpf_map_type map_type = ri->map_type;
void *fwd = ri->tgt_value;
u32 map_id = ri->map_id;
+ struct xdp_frame *xdpf;
struct bpf_map *map;
int err;
ri->map_id = 0; /* Valid map id idr range: [1,INT_MAX[ */
ri->map_type = BPF_MAP_TYPE_UNSPEC;
+ if (map_type == BPF_MAP_TYPE_XSKMAP) {
+ err = __xsk_map_redirect(fwd, xdp);
+ goto out;
+ }
+
+ xdpf = xdp_convert_buff_to_frame(xdp);
+ if (unlikely(!xdpf)) {
+ err = -EOVERFLOW;
+ goto err;
+ }
+
switch (map_type) {
case BPF_MAP_TYPE_DEVMAP:
fallthrough;
@@ -3977,17 +3989,14 @@ int xdp_do_redirect(struct net_device *dev, struct xdp_buff *xdp,
map = READ_ONCE(ri->map);
if (unlikely(map)) {
WRITE_ONCE(ri->map, NULL);
- err = dev_map_enqueue_multi(xdp, dev, map,
+ err = dev_map_enqueue_multi(xdpf, dev, map,
ri->flags & BPF_F_EXCLUDE_INGRESS);
} else {
- err = dev_map_enqueue(fwd, xdp, dev);
+ err = dev_map_enqueue(fwd, xdpf, dev);
}
break;
case BPF_MAP_TYPE_CPUMAP:
- err = cpu_map_enqueue(fwd, xdp, dev);
- break;
- case BPF_MAP_TYPE_XSKMAP:
- err = __xsk_map_redirect(fwd, xdp);
+ err = cpu_map_enqueue(fwd, xdpf, dev);
break;
case BPF_MAP_TYPE_UNSPEC:
if (map_id == INT_MAX) {
@@ -3996,7 +4005,7 @@ int xdp_do_redirect(struct net_device *dev, struct xdp_buff *xdp,
err = -EINVAL;
break;
}
- err = dev_xdp_enqueue(fwd, xdp, dev);
+ err = dev_xdp_enqueue(fwd, xdpf, dev);
break;
}
fallthrough;
@@ -4004,6 +4013,7 @@ int xdp_do_redirect(struct net_device *dev, struct xdp_buff *xdp,
err = -EBADRQC;
}
+out:
if (unlikely(err))
goto err;
--
2.34.1
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