If the sockmap msg redirection function is used only to forward packets
and no other operation, the execution result of the BPF_SK_MSG_VERDICT
program is the same each time. In this case, the BPF program only needs to
be run once. Add BPF_F_PERMANENTLY flag to bpf_msg_redirect_map() and
bpf_msg_redirect_hash() to implement this ability.
Then we can enable this function in the bpf program as follows:
bpf_msg_redirect_hash(xx, xx, xx, BPF_F_INGRESS | BPF_F_PERMANENTLY);
Test results using netperf TCP_STREAM mode:
for i in 1 64 128 512 1k 2k 32k 64k 100k 500k 1m;then
netperf -T 1,2 -t TCP_STREAM -H 127.0.0.1 -l 20 -- -m $i -s 100m,100m -S 100m,100m
done
before:
3.84 246.52 496.89 1885.03 3415.29 6375.03 40749.09 48764.40 51611.34 55678.26 55992.78
after:
4.43 279.20 555.82 2080.79 3870.70 7105.44 41836.41 49709.75 51861.56 55211.00 54566.85
Signed-off-by: Liu Jian <liujian56@xxxxxxxxxx>
---
include/linux/skmsg.h | 1 +
include/uapi/linux/bpf.h | 7 +++++--
net/core/skmsg.c | 1 +
net/core/sock_map.c | 4 ++--
net/ipv4/tcp_bpf.c | 21 +++++++++++++++------
tools/include/uapi/linux/bpf.h | 7 +++++--
6 files changed, 29 insertions(+), 12 deletions(-)
diff --git a/include/linux/skmsg.h b/include/linux/skmsg.h
index 054d7911bfc9..b2da9c432f52 100644
--- a/include/linux/skmsg.h
+++ b/include/linux/skmsg.h
@@ -82,6 +82,7 @@ struct sk_psock {
u32 cork_bytes;
u32 eval;
bool redir_ingress; /* undefined if sk_redir is null */
+ bool eval_permanently;
struct sk_msg *cork;
struct sk_psock_progs progs;
#if IS_ENABLED(CONFIG_BPF_STREAM_PARSER)
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index 70da85200695..cf622ea4f018 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -3004,7 +3004,8 @@ union bpf_attr {
* egress interfaces can be used for redirection. The
* **BPF_F_INGRESS** value in *flags* is used to make the
* distinction (ingress path is selected if the flag is present,
- * egress path otherwise). This is the only flag supported for now.
+ * egress path otherwise). The **BPF_F_PERMANENTLY** value in
+ * *flags* is used to indicates whether the eBPF result is permanent.
* Return
* **SK_PASS** on success, or **SK_DROP** on error.
*
@@ -3276,7 +3277,8 @@ union bpf_attr {
* egress interfaces can be used for redirection. The
* **BPF_F_INGRESS** value in *flags* is used to make the
* distinction (ingress path is selected if the flag is present,
- * egress path otherwise). This is the only flag supported for now.
+ * egress path otherwise). The **BPF_F_PERMANENTLY** value in
+ * *flags* is used to indicates whether the eBPF result is permanent.
* Return
* **SK_PASS** on success, or **SK_DROP** on error.
*
@@ -5872,6 +5874,7 @@ enum {
/* BPF_FUNC_clone_redirect and BPF_FUNC_redirect flags. */
enum {
BPF_F_INGRESS = (1ULL << 0),
+ BPF_F_PERMANENTLY = (1ULL << 1),
};
/* BPF_FUNC_skb_set_tunnel_key and BPF_FUNC_skb_get_tunnel_key flags. */
diff --git a/net/core/skmsg.c b/net/core/skmsg.c
index a29508e1ff35..b2bf9b5c4252 100644
--- a/net/core/skmsg.c
+++ b/net/core/skmsg.c
@@ -875,6 +875,7 @@ int sk_psock_msg_verdict(struct sock *sk, struct sk_psock *psock,
ret = bpf_prog_run_pin_on_cpu(prog, msg);
ret = sk_psock_map_verd(ret, msg->sk_redir);
psock->apply_bytes = msg->apply_bytes;
+ psock->eval_permanently = msg->flags & BPF_F_PERMANENTLY;
if (ret == __SK_REDIRECT) {
if (psock->sk_redir) {
sock_put(psock->sk_redir);
diff --git a/net/core/sock_map.c b/net/core/sock_map.c
index 08ab108206bf..6a0c90be7f4f 100644
--- a/net/core/sock_map.c
+++ b/net/core/sock_map.c
@@ -662,7 +662,7 @@ BPF_CALL_4(bpf_msg_redirect_map, struct sk_msg *, msg,
{
struct sock *sk;
- if (unlikely(flags & ~(BPF_F_INGRESS)))
+ if (unlikely(flags & ~(BPF_F_INGRESS | BPF_F_PERMANENTLY)))
return SK_DROP;
sk = __sock_map_lookup_elem(map, key);
@@ -1261,7 +1261,7 @@ BPF_CALL_4(bpf_msg_redirect_hash, struct sk_msg *, msg,
{
struct sock *sk;
- if (unlikely(flags & ~(BPF_F_INGRESS)))
+ if (unlikely(flags & ~(BPF_F_INGRESS | BPF_F_PERMANENTLY)))
return SK_DROP;
sk = __sock_hash_lookup_elem(map, key);
diff --git a/net/ipv4/tcp_bpf.c b/net/ipv4/tcp_bpf.c
index 81f0dff69e0b..36cf2b0fa6f8 100644
--- a/net/ipv4/tcp_bpf.c
+++ b/net/ipv4/tcp_bpf.c
@@ -419,8 +419,10 @@ static int tcp_bpf_send_verdict(struct sock *sk, struct sk_psock *psock,
if (!psock->apply_bytes) {
/* Clean up before releasing the sock lock. */
eval = psock->eval;
- psock->eval = __SK_NONE;
- psock->sk_redir = NULL;
+ if (!psock->eval_permanently) {
+ psock->eval = __SK_NONE;
+ psock->sk_redir = NULL;
+ }
}
if (psock->cork) {
cork = true;
@@ -433,9 +435,15 @@ static int tcp_bpf_send_verdict(struct sock *sk, struct sk_psock *psock,
ret = tcp_bpf_sendmsg_redir(sk_redir, redir_ingress,
msg, tosend, flags);
sent = origsize - msg->sg.size;
+ /* disable the ability when something wrong */
+ if (unlikely(ret < 0))
+ psock->eval_permanently = 0;
- if (eval == __SK_REDIRECT)
+ if (!psock->eval_permanently && eval == __SK_REDIRECT) {
sock_put(sk_redir);
+ psock->sk_redir = NULL;
+ psock->eval = __SK_NONE;
+ }
lock_sock(sk);
if (unlikely(ret < 0)) {
@@ -460,8 +468,8 @@ static int tcp_bpf_send_verdict(struct sock *sk, struct sk_psock *psock,
}
if (likely(!ret)) {
- if (!psock->apply_bytes) {
- psock->eval = __SK_NONE;
+ if (!psock->apply_bytes && !psock->eval_permanently) {
+ psock->eval = __SK_NONE;
if (psock->sk_redir) {
sock_put(psock->sk_redir);
psock->sk_redir = NULL;
@@ -540,7 +548,8 @@ static int tcp_bpf_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
if (psock->cork_bytes && !enospc)
goto out_err;
/* All cork bytes are accounted, rerun the prog. */
- psock->eval = __SK_NONE;
+ if (!psock->eval_permanently)
+ psock->eval = __SK_NONE;
psock->cork_bytes = 0;
}
diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index 70da85200695..cf622ea4f018 100644
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -3004,7 +3004,8 @@ union bpf_attr {
* egress interfaces can be used for redirection. The
* **BPF_F_INGRESS** value in *flags* is used to make the
* distinction (ingress path is selected if the flag is present,
- * egress path otherwise). This is the only flag supported for now.
+ * egress path otherwise). The **BPF_F_PERMANENTLY** value in
+ * *flags* is used to indicates whether the eBPF result is permanent.
* Return
* **SK_PASS** on success, or **SK_DROP** on error.
*
@@ -3276,7 +3277,8 @@ union bpf_attr {
* egress interfaces can be used for redirection. The
* **BPF_F_INGRESS** value in *flags* is used to make the
* distinction (ingress path is selected if the flag is present,
- * egress path otherwise). This is the only flag supported for now.
+ * egress path otherwise). The **BPF_F_PERMANENTLY** value in
+ * *flags* is used to indicates whether the eBPF result is permanent.
* Return
* **SK_PASS** on success, or **SK_DROP** on error.
*
@@ -5872,6 +5874,7 @@ enum {
/* BPF_FUNC_clone_redirect and BPF_FUNC_redirect flags. */
enum {
BPF_F_INGRESS = (1ULL << 0),
+ BPF_F_PERMANENTLY = (1ULL << 1),
};
/* BPF_FUNC_skb_set_tunnel_key and BPF_FUNC_skb_get_tunnel_key flags. */
--
2.34.1
