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Date: Fri, 25 Nov 2016 16:39:56 +0100
From: Paolo Abeni <pabeni@...hat.com>
To: netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jesper Dangaard Brouer <brouer@...hat.com>,
Hannes Frederic Sowa <hannes@...essinduktion.org>,
Sabrina Dubroca <sd@...asysnail.net>
Subject: [PATCH net-next 5/5] udp: add recvmmsg implementation
skbs are extracted from the receive queue in burts, and a single
sk_rmem_alloc/forward allocated memory update is performed for
each burst.
MSG_PEEK and MSG_ERRQUEUE are not supported to keep the implementation
as simple as possible.
Signed-off-by: Sabrina Dubroca <sd@...asysnail.net>
Signed-off-by: Paolo Abeni <pabeni@...hat.com>
---
include/net/udp.h | 7 +++
net/ipv4/udp.c | 121 ++++++++++++++++++++++++++++++++++++++++++++++++++++
net/ipv4/udp_impl.h | 3 ++
net/ipv4/udplite.c | 1 +
net/ipv6/udp.c | 16 +++++++
net/ipv6/udp_impl.h | 3 ++
net/ipv6/udplite.c | 1 +
7 files changed, 152 insertions(+)
diff --git a/include/net/udp.h b/include/net/udp.h
index 1661791..2bd63c9 100644
--- a/include/net/udp.h
+++ b/include/net/udp.h
@@ -308,6 +308,13 @@ struct sock *__udp6_lib_lookup(struct net *net,
struct sock *udp6_lib_lookup_skb(struct sk_buff *skb,
__be16 sport, __be16 dport);
+int __udp_recvmmsg(struct sock *sk, struct mmsghdr __user *ummsg,
+ unsigned int *vlen, unsigned int flags,
+ struct timespec *timeout, const struct timespec64 *end_time,
+ int (*udp_process_msg)(struct sock *sk, struct sk_buff *skb,
+ struct msghdr *msg,
+ unsigned int flags));
+
/*
* SNMP statistics for UDP and UDP-Lite
*/
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index d99429d..44f1326 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -1467,6 +1467,126 @@ int udp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int noblock,
return err;
}
+static void udp_skb_bulk_destructor(struct sock *sk, int totalsize)
+{
+ udp_rmem_release(sk, totalsize, 1);
+}
+
+int __udp_recvmmsg(struct sock *sk, struct mmsghdr __user *mmsg,
+ unsigned int *nr, unsigned int flags,
+ struct timespec *timeout, const struct timespec64 *end_time,
+ int (*process_msg)(struct sock *sk, struct sk_buff *skb,
+ struct msghdr *msg,
+ unsigned int flags))
+{
+ long timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
+ int datagrams = 0, err = 0, ret = 0, vlen = *nr;
+ struct sk_buff *skb, *next, *last;
+
+ if (flags & (MSG_PEEK | MSG_ERRQUEUE))
+ return -EOPNOTSUPP;
+
+again:
+ for (;;) {
+ skb = __skb_try_recv_datagram_batch(sk, flags, vlen - datagrams,
+ udp_skb_bulk_destructor,
+ &err);
+ if (skb)
+ break;
+
+ if ((err != -EAGAIN) || !timeo || (flags & MSG_DONTWAIT))
+ goto out;
+
+ /* no packets, and we are supposed to wait for the next */
+ if (timeout) {
+ long expires;
+
+ if (sock_recvmmsg_timeout(timeout, *end_time))
+ goto out;
+ expires = timeout->tv_sec * HZ +
+ (timeout->tv_nsec >> 20);
+ if (expires + 1 < timeo)
+ timeo = expires + 1;
+ }
+
+ /* the queue was empty when tried to dequeue */
+ last = (struct sk_buff *)&sk->sk_receive_queue;
+ if (__skb_wait_for_more_packets(sk, &err, &timeo, last))
+ goto out;
+ }
+
+ for (; skb; skb = next) {
+ struct recvmmsg_ctx ctx;
+ int len;
+
+ next = skb->next;
+ err = recvmmsg_ctx_from_user(sk, mmsg, flags, datagrams, &ctx);
+ if (err < 0) {
+ kfree_skb(skb);
+ goto free_ctx;
+ }
+
+ /* process skb's until we find a valid one */
+ for (;;) {
+ len = process_msg(sk, skb, &ctx.msg_sys, flags);
+ if (len >= 0)
+ break;
+
+ /* only non csum errors are propagated to the caller */
+ if (len != -EINVAL) {
+ err = len;
+ goto free_ctx;
+ }
+
+ if (!next)
+ goto free_ctx;
+ skb = next;
+ next = skb->next;
+ }
+
+ err = recvmmsg_ctx_to_user(&mmsg, len, flags, &ctx);
+ if (err < 0)
+ goto free_ctx;
+
+ /* now we're sure the skb is fully processed, we can count it */
+ datagrams++;
+
+free_ctx:
+ recvmmsg_ctx_free(&ctx);
+ if (err < 0)
+ ret = err;
+ }
+
+ /* only handle waitforone after processing a full batch. */
+ if (datagrams && (flags & MSG_WAITFORONE))
+ flags |= MSG_DONTWAIT;
+
+ if (!ret && (datagrams < vlen)) {
+ cond_resched();
+ goto again;
+ }
+
+out:
+ *nr = datagrams;
+ return ret < 0 ? ret : -EAGAIN;
+}
+EXPORT_SYMBOL_GPL(__udp_recvmmsg);
+
+static int udp_process_msg(struct sock *sk, struct sk_buff *skb,
+ struct msghdr *msg, unsigned int flags)
+{
+ return udp_process_skb(sk, skb, msg, msg_data_left(msg), flags,
+ &msg->msg_namelen, 0, 0, skb->peeked);
+}
+
+int udp_recvmmsg(struct sock *sk, struct mmsghdr __user *ummsg,
+ unsigned int *nr, unsigned int flags, struct timespec *timeout,
+ const struct timespec64 *end_time)
+{
+ return __udp_recvmmsg(sk, ummsg, nr, flags, timeout, end_time,
+ udp_process_msg);
+}
+
int __udp_disconnect(struct sock *sk, int flags)
{
struct inet_sock *inet = inet_sk(sk);
@@ -2329,6 +2449,7 @@ struct proto udp_prot = {
.getsockopt = udp_getsockopt,
.sendmsg = udp_sendmsg,
.recvmsg = udp_recvmsg,
+ .recvmmsg = udp_recvmmsg,
.sendpage = udp_sendpage,
.release_cb = ip4_datagram_release_cb,
.hash = udp_lib_hash,
diff --git a/net/ipv4/udp_impl.h b/net/ipv4/udp_impl.h
index 7e0fe4b..f11d608 100644
--- a/net/ipv4/udp_impl.h
+++ b/net/ipv4/udp_impl.h
@@ -23,6 +23,9 @@ int compat_udp_getsockopt(struct sock *sk, int level, int optname,
#endif
int udp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int noblock,
int flags, int *addr_len);
+int udp_recvmmsg(struct sock *sk, struct mmsghdr __user *ummsg,
+ unsigned int *nr, unsigned int flags, struct timespec *timeout,
+ const struct timespec64 *end_time);
int udp_sendpage(struct sock *sk, struct page *page, int offset, size_t size,
int flags);
int udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb);
diff --git a/net/ipv4/udplite.c b/net/ipv4/udplite.c
index 59f10fe..a0e7fe9 100644
--- a/net/ipv4/udplite.c
+++ b/net/ipv4/udplite.c
@@ -49,6 +49,7 @@ struct proto udplite_prot = {
.getsockopt = udp_getsockopt,
.sendmsg = udp_sendmsg,
.recvmsg = udp_recvmsg,
+ .recvmmsg = udp_recvmmsg,
.sendpage = udp_sendpage,
.hash = udp_lib_hash,
.unhash = udp_lib_unhash,
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 3218c64..2c034be 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -479,6 +479,21 @@ int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
}
+static int udp6_process_msg(struct sock *sk, struct sk_buff *skb,
+ struct msghdr *msg, unsigned int flags)
+{
+ return udp6_process_skb(sk, skb, msg, msg_data_left(msg), flags,
+ &msg->msg_namelen, 0, 0, skb->peeked);
+}
+
+int udpv6_recvmmsg(struct sock *sk, struct mmsghdr __user *ummsg,
+ unsigned int *nr, unsigned int flags,
+ struct timespec *timeout, const struct timespec64 *end_time)
+{
+ return __udp_recvmmsg(sk, ummsg, nr, flags, timeout, end_time,
+ udp6_process_msg);
+}
+
void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
u8 type, u8 code, int offset, __be32 info,
struct udp_table *udptable)
@@ -1443,6 +1458,7 @@ struct proto udpv6_prot = {
.getsockopt = udpv6_getsockopt,
.sendmsg = udpv6_sendmsg,
.recvmsg = udpv6_recvmsg,
+ .recvmmsg = udpv6_recvmmsg,
.release_cb = ip6_datagram_release_cb,
.hash = udp_lib_hash,
.unhash = udp_lib_unhash,
diff --git a/net/ipv6/udp_impl.h b/net/ipv6/udp_impl.h
index f6eb1ab..fe566db 100644
--- a/net/ipv6/udp_impl.h
+++ b/net/ipv6/udp_impl.h
@@ -26,6 +26,9 @@ int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len);
int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int noblock,
int flags, int *addr_len);
+int udpv6_recvmmsg(struct sock *sk, struct mmsghdr __user *ummsg,
+ unsigned int *nr, unsigned int flags,
+ struct timespec *timeout, const struct timespec64 *end_time);
int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb);
void udpv6_destroy_sock(struct sock *sk);
diff --git a/net/ipv6/udplite.c b/net/ipv6/udplite.c
index 2784cc3..23d80ac 100644
--- a/net/ipv6/udplite.c
+++ b/net/ipv6/udplite.c
@@ -45,6 +45,7 @@ struct proto udplitev6_prot = {
.getsockopt = udpv6_getsockopt,
.sendmsg = udpv6_sendmsg,
.recvmsg = udpv6_recvmsg,
+ .recvmmsg = udpv6_recvmmsg,
.hash = udp_lib_hash,
.unhash = udp_lib_unhash,
.get_port = udp_v6_get_port,
--
1.8.3.1
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