Completely avoid default sock memory accounting and replace it
with udp-specific accounting.
Since the new memory accounting model encapsulates completely
the required locking, remove the socket lock on both enqueue and
dequeue, and avoid using the backlog on enqueue.
Be sure to clean-up rx queue memory on socket destruction, using
udp its own sk_destruct.
Tested using pktgen with random src port, 64 bytes packet,
wire-speed on a 10G link as sender and udp_sink as the receiver,
using an l4 tuple rxhash to stress the contention, and one or more
udp_sink instances with reuseport.
nr readers Kpps (vanilla) Kpps (patched)
1 170 440
3 1250 2150
6 3000 3650
9 4200 4450
12 5700 6250
v4 -> v5:
- avoid unneeded test in first_packet_length
v3 -> v4:
- remove useless sk_rcvqueues_full() call
v2 -> v3:
- do not set the now unsed backlog_rcv callback
v1 -> v2:
- add memory pressure support
- fixed dropwatch accounting for ipv6
Acked-by: Hannes Frederic Sowa <hannes@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx>
---
net/ipv4/udp.c | 43 ++++++++-----------------------------------
net/ipv6/udp.c | 34 ++++++++--------------------------
net/sunrpc/svcsock.c | 20 ++++++++++++++++----
net/sunrpc/xprtsock.c | 2 +-
4 files changed, 33 insertions(+), 66 deletions(-)
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index e137e1d..b38269d 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -1307,13 +1307,7 @@ static int first_packet_length(struct sock *sk)
res = skb ? skb->len : -1;
spin_unlock_bh(&rcvq->lock);
- if (!skb_queue_empty(&list_kill)) {
- bool slow = lock_sock_fast(sk);
-
- __skb_queue_purge(&list_kill);
- sk_mem_reclaim_partial(sk);
- unlock_sock_fast(sk, slow);
- }
+ __skb_queue_purge(&list_kill);
return res;
}
@@ -1362,7 +1356,6 @@ int udp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int noblock,
int err;
int is_udplite = IS_UDPLITE(sk);
bool checksum_valid = false;
- bool slow;
if (flags & MSG_ERRQUEUE)
return ip_recv_error(sk, msg, len, addr_len);
@@ -1403,13 +1396,12 @@ int udp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int noblock,
}
if (unlikely(err)) {
- trace_kfree_skb(skb, udp_recvmsg);
if (!peeked) {
atomic_inc(&sk->sk_drops);
UDP_INC_STATS(sock_net(sk),
UDP_MIB_INERRORS, is_udplite);
}
- skb_free_datagram_locked(sk, skb);
+ kfree_skb(skb);
return err;
}
@@ -1434,16 +1426,15 @@ int udp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int noblock,
if (flags & MSG_TRUNC)
err = ulen;
- __skb_free_datagram_locked(sk, skb, peeking ? -err : err);
+ skb_consume_udp(sk, skb, peeking ? -err : err);
return err;
csum_copy_err:
- slow = lock_sock_fast(sk);
- if (!skb_kill_datagram(sk, skb, flags)) {
+ if (!__sk_queue_drop_skb(sk, skb, flags)) {
UDP_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
}
- unlock_sock_fast(sk, slow);
+ kfree_skb(skb);
/* starting over for a new packet, but check if we need to yield */
cond_resched();
@@ -1562,7 +1553,7 @@ static int __udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
sk_incoming_cpu_update(sk);
}
- rc = __sock_queue_rcv_skb(sk, skb);
+ rc = __udp_enqueue_schedule_skb(sk, skb);
if (rc < 0) {
int is_udplite = IS_UDPLITE(sk);
@@ -1577,7 +1568,6 @@ static int __udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
}
return 0;
-
}
static struct static_key udp_encap_needed __read_mostly;
@@ -1599,7 +1589,6 @@ void udp_encap_enable(void)
int udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
{
struct udp_sock *up = udp_sk(sk);
- int rc;
int is_udplite = IS_UDPLITE(sk);
/*
@@ -1686,25 +1675,9 @@ int udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
goto drop;
udp_csum_pull_header(skb);
- if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
- __UDP_INC_STATS(sock_net(sk), UDP_MIB_RCVBUFERRORS,
- is_udplite);
- goto drop;
- }
-
- rc = 0;
ipv4_pktinfo_prepare(sk, skb);
- bh_lock_sock(sk);
- if (!sock_owned_by_user(sk))
- rc = __udp_queue_rcv_skb(sk, skb);
- else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
- bh_unlock_sock(sk);
- goto drop;
- }
- bh_unlock_sock(sk);
-
- return rc;
+ return __udp_queue_rcv_skb(sk, skb);
csum_error:
__UDP_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
@@ -2314,13 +2287,13 @@ struct proto udp_prot = {
.connect = ip4_datagram_connect,
.disconnect = udp_disconnect,
.ioctl = udp_ioctl,
+ .init = udp_init_sock,
.destroy = udp_destroy_sock,
.setsockopt = udp_setsockopt,
.getsockopt = udp_getsockopt,
.sendmsg = udp_sendmsg,
.recvmsg = udp_recvmsg,
.sendpage = udp_sendpage,
- .backlog_rcv = __udp_queue_rcv_skb,
.release_cb = ip4_datagram_release_cb,
.hash = udp_lib_hash,
.unhash = udp_lib_unhash,
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 9aa7c1c..71963b2 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -334,7 +334,6 @@ int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
int is_udplite = IS_UDPLITE(sk);
bool checksum_valid = false;
int is_udp4;
- bool slow;
if (flags & MSG_ERRQUEUE)
return ipv6_recv_error(sk, msg, len, addr_len);
@@ -378,7 +377,6 @@ int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
goto csum_copy_err;
}
if (unlikely(err)) {
- trace_kfree_skb(skb, udpv6_recvmsg);
if (!peeked) {
atomic_inc(&sk->sk_drops);
if (is_udp4)
@@ -388,7 +386,7 @@ int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS,
is_udplite);
}
- skb_free_datagram_locked(sk, skb);
+ kfree_skb(skb);
return err;
}
if (!peeked) {
@@ -437,12 +435,11 @@ int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
if (flags & MSG_TRUNC)
err = ulen;
- __skb_free_datagram_locked(sk, skb, peeking ? -err : err);
+ skb_consume_udp(sk, skb, peeking ? -err : err);
return err;
csum_copy_err:
- slow = lock_sock_fast(sk);
- if (!skb_kill_datagram(sk, skb, flags)) {
+ if (!__sk_queue_drop_skb(sk, skb, flags)) {
if (is_udp4) {
UDP_INC_STATS(sock_net(sk),
UDP_MIB_CSUMERRORS, is_udplite);
@@ -455,7 +452,7 @@ int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
UDP_MIB_INERRORS, is_udplite);
}
}
- unlock_sock_fast(sk, slow);
+ kfree_skb(skb);
/* starting over for a new packet, but check if we need to yield */
cond_resched();
@@ -523,7 +520,7 @@ static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
sk_incoming_cpu_update(sk);
}
- rc = __sock_queue_rcv_skb(sk, skb);
+ rc = __udp_enqueue_schedule_skb(sk, skb);
if (rc < 0) {
int is_udplite = IS_UDPLITE(sk);
@@ -535,6 +532,7 @@ static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
kfree_skb(skb);
return -1;
}
+
return 0;
}
@@ -556,7 +554,6 @@ void udpv6_encap_enable(void)
int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
{
struct udp_sock *up = udp_sk(sk);
- int rc;
int is_udplite = IS_UDPLITE(sk);
if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
@@ -622,25 +619,10 @@ int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
goto drop;
udp_csum_pull_header(skb);
- if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
- __UDP6_INC_STATS(sock_net(sk),
- UDP_MIB_RCVBUFERRORS, is_udplite);
- goto drop;
- }
skb_dst_drop(skb);
- bh_lock_sock(sk);
- rc = 0;
- if (!sock_owned_by_user(sk))
- rc = __udpv6_queue_rcv_skb(sk, skb);
- else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
- bh_unlock_sock(sk);
- goto drop;
- }
- bh_unlock_sock(sk);
-
- return rc;
+ return __udpv6_queue_rcv_skb(sk, skb);
csum_error:
__UDP6_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
@@ -1433,12 +1415,12 @@ struct proto udpv6_prot = {
.connect = ip6_datagram_connect,
.disconnect = udp_disconnect,
.ioctl = udp_ioctl,
+ .init = udp_init_sock,
.destroy = udpv6_destroy_sock,
.setsockopt = udpv6_setsockopt,
.getsockopt = udpv6_getsockopt,
.sendmsg = udpv6_sendmsg,
.recvmsg = udpv6_recvmsg,
- .backlog_rcv = __udpv6_queue_rcv_skb,
.release_cb = ip6_datagram_release_cb,
.hash = udp_lib_hash,
.unhash = udp_lib_unhash,
diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c
index 57625f6..e2a55dc 100644
--- a/net/sunrpc/svcsock.c
+++ b/net/sunrpc/svcsock.c
@@ -39,6 +39,7 @@
#include <net/checksum.h>
#include <net/ip.h>
#include <net/ipv6.h>
+#include <net/udp.h>
#include <net/tcp.h>
#include <net/tcp_states.h>
#include <asm/uaccess.h>
@@ -129,6 +130,18 @@ static void svc_release_skb(struct svc_rqst *rqstp)
}
}
+static void svc_release_udp_skb(struct svc_rqst *rqstp)
+{
+ struct sk_buff *skb = rqstp->rq_xprt_ctxt;
+
+ if (skb) {
+ rqstp->rq_xprt_ctxt = NULL;
+
+ dprintk("svc: service %p, releasing skb %p\n", rqstp, skb);
+ consume_skb(skb);
+ }
+}
+
union svc_pktinfo_u {
struct in_pktinfo pkti;
struct in6_pktinfo pkti6;
@@ -575,7 +588,7 @@ static int svc_udp_recvfrom(struct svc_rqst *rqstp)
goto out_free;
}
local_bh_enable();
- skb_free_datagram_locked(svsk->sk_sk, skb);
+ consume_skb(skb);
} else {
/* we can use it in-place */
rqstp->rq_arg.head[0].iov_base = skb->data;
@@ -602,8 +615,7 @@ static int svc_udp_recvfrom(struct svc_rqst *rqstp)
return len;
out_free:
- trace_kfree_skb(skb, svc_udp_recvfrom);
- skb_free_datagram_locked(svsk->sk_sk, skb);
+ kfree_skb(skb);
return 0;
}
@@ -660,7 +672,7 @@ static struct svc_xprt *svc_udp_create(struct svc_serv *serv,
.xpo_create = svc_udp_create,
.xpo_recvfrom = svc_udp_recvfrom,
.xpo_sendto = svc_udp_sendto,
- .xpo_release_rqst = svc_release_skb,
+ .xpo_release_rqst = svc_release_udp_skb,
.xpo_detach = svc_sock_detach,
.xpo_free = svc_sock_free,
.xpo_prep_reply_hdr = svc_udp_prep_reply_hdr,
diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index 0137af1..1758665 100644
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -1083,7 +1083,7 @@ static void xs_udp_data_receive(struct sock_xprt *transport)
skb = skb_recv_datagram(sk, 0, 1, &err);
if (skb != NULL) {
xs_udp_data_read_skb(&transport->xprt, sk, skb);
- skb_free_datagram_locked(sk, skb);
+ consume_skb(skb);
continue;
}
if (!test_and_clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
--
1.8.3.1
--
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