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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 09/10] net: add paged frag destructor support to kernel_sendpage.
This requires adding a new argument to various sendpage hooks up and down the
stack. At the moment this parameter is always NULL.
Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: Alexey Kuznetsov <kuznet@xxxxxxxxxxxxx>
Cc: "Pekka Savola (ipv6)" <pekkas@xxxxxxxxxx>
Cc: James Morris <jmorris@xxxxxxxxx>
Cc: Hideaki YOSHIFUJI <yoshfuji@xxxxxxxxxxxxxx>
Cc: Patrick McHardy <kaber@xxxxxxxxx>
Cc: Trond Myklebust <Trond.Myklebust@xxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxx>
Cc: drbd-user@xxxxxxxxxxxxxxxx
Cc: devel@xxxxxxxxxxxxxxxxxxxx
Cc: cluster-devel@xxxxxxxxxx
Cc: ocfs2-devel@xxxxxxxxxxxxxx
Cc: netdev@xxxxxxxxxxxxxxx
Cc: ceph-devel@xxxxxxxxxxxxxxx
Cc: rds-devel@xxxxxxxxxxxxxx
Cc: linux-nfs@xxxxxxxxxxxxxxx
---
drivers/block/drbd/drbd_main.c | 1 +
drivers/scsi/iscsi_tcp.c | 4 ++--
drivers/scsi/iscsi_tcp.h | 3 ++-
drivers/target/iscsi/iscsi_target_util.c | 3 ++-
fs/dlm/lowcomms.c | 4 ++--
fs/ocfs2/cluster/tcp.c | 1 +
include/linux/net.h | 6 +++++-
include/net/inet_common.h | 4 +++-
include/net/ip.h | 4 +++-
include/net/sock.h | 8 +++++---
include/net/tcp.h | 4 +++-
net/ceph/messenger.c | 2 +-
net/core/sock.c | 6 +++++-
net/ipv4/af_inet.c | 9 ++++++---
net/ipv4/ip_output.c | 6 ++++--
net/ipv4/tcp.c | 24 +++++++++++++++---------
net/ipv4/udp.c | 11 ++++++-----
net/ipv4/udp_impl.h | 5 +++--
net/rds/tcp_send.c | 1 +
net/socket.c | 11 +++++++----
net/sunrpc/svcsock.c | 6 +++---
net/sunrpc/xprtsock.c | 2 +-
22 files changed, 81 insertions(+), 44 deletions(-)
diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index 211fc44..e70ba0c 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -2584,6 +2584,7 @@ static int _drbd_send_page(struct drbd_conf *mdev, struct
page *page,
set_fs(KERNEL_DS);
do {
sent = mdev->data.socket->ops->sendpage(mdev->data.socket, page,
+ NULL,
offset, len,
msg_flags);
if (sent == -EAGAIN) {
diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
index 453a740..df9f7dd 100644
--- a/drivers/scsi/iscsi_tcp.c
+++ b/drivers/scsi/iscsi_tcp.c
@@ -284,8 +284,8 @@ static int iscsi_sw_tcp_xmit_segment(struct iscsi_tcp_conn
*tcp_conn,
if (!segment->data) {
sg = segment->sg;
offset += segment->sg_offset + sg->offset;
- r = tcp_sw_conn->sendpage(sk, sg_page(sg), offset,
- copy, flags);
+ r = tcp_sw_conn->sendpage(sk, sg_page(sg), NULL,
+ offset, copy, flags);
} else {
struct msghdr msg = { .msg_flags = flags };
struct kvec iov = {
diff --git a/drivers/scsi/iscsi_tcp.h b/drivers/scsi/iscsi_tcp.h
index 666fe09..1e23265 100644
--- a/drivers/scsi/iscsi_tcp.h
+++ b/drivers/scsi/iscsi_tcp.h
@@ -52,7 +52,8 @@ struct iscsi_sw_tcp_conn {
uint32_t sendpage_failures_cnt;
uint32_t discontiguous_hdr_cnt;
- ssize_t (*sendpage)(struct socket *, struct page *, int, size_t, int);
+ ssize_t (*sendpage)(struct socket *, struct page *,
+ struct skb_frag_destructor *, int, size_t, int);
};
struct iscsi_sw_tcp_host {
diff --git a/drivers/target/iscsi/iscsi_target_util.c
b/drivers/target/iscsi/iscsi_target_util.c
index 4eba86d..d876dae 100644
--- a/drivers/target/iscsi/iscsi_target_util.c
+++ b/drivers/target/iscsi/iscsi_target_util.c
@@ -1323,7 +1323,8 @@ send_hdr:
u32 sub_len = min_t(u32, data_len, space);
send_pg:
tx_sent = conn->sock->ops->sendpage(conn->sock,
- sg_page(sg), sg->offset + offset,
sub_len, 0);
+ sg_page(sg), NULL,
+ sg->offset + offset, sub_len, 0);
if (tx_sent != sub_len) {
if (tx_sent == -EAGAIN) {
pr_err("tcp_sendpage() returned"
diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c
index 133ef6d..0673cea 100644
--- a/fs/dlm/lowcomms.c
+++ b/fs/dlm/lowcomms.c
@@ -1336,8 +1336,8 @@ static void send_to_sock(struct connection *con)
ret = 0;
if (len) {
- ret = kernel_sendpage(con->sock, e->page, offset, len,
- msg_flags);
+ ret = kernel_sendpage(con->sock, e->page, NULL,
+ offset, len, msg_flags);
if (ret == -EAGAIN || ret == 0) {
if (ret == -EAGAIN &&
test_bit(SOCK_ASYNC_NOSPACE,
&con->sock->flags) &&
diff --git a/fs/ocfs2/cluster/tcp.c b/fs/ocfs2/cluster/tcp.c
index 044e7b5..e13851e 100644
--- a/fs/ocfs2/cluster/tcp.c
+++ b/fs/ocfs2/cluster/tcp.c
@@ -983,6 +983,7 @@ static void o2net_sendpage(struct o2net_sock_container *sc,
mutex_lock(&sc->sc_send_lock);
ret = sc->sc_sock->ops->sendpage(sc->sc_sock,
virt_to_page(kmalloced_virt),
+ NULL,
(long)kmalloced_virt &
~PAGE_MASK,
size, MSG_DONTWAIT);
mutex_unlock(&sc->sc_send_lock);
diff --git a/include/linux/net.h b/include/linux/net.h
index be60c7f..d9b0d648 100644
--- a/include/linux/net.h
+++ b/include/linux/net.h
@@ -157,6 +157,7 @@ struct kiocb;
struct sockaddr;
struct msghdr;
struct module;
+struct skb_frag_destructor;
struct proto_ops {
int family;
@@ -203,6 +204,7 @@ struct proto_ops {
int (*mmap) (struct file *file, struct socket *sock,
struct vm_area_struct * vma);
ssize_t (*sendpage) (struct socket *sock, struct page *page,
+ struct skb_frag_destructor *destroy,
int offset, size_t size, int flags);
ssize_t (*splice_read)(struct socket *sock, loff_t *ppos,
struct pipe_inode_info *pipe, size_t
len, unsigned int flags);
@@ -274,7 +276,9 @@ extern int kernel_getsockopt(struct socket *sock, int
level, int optname,
char *optval, int *optlen);
extern int kernel_setsockopt(struct socket *sock, int level, int optname,
char *optval, unsigned int optlen);
-extern int kernel_sendpage(struct socket *sock, struct page *page, int offset,
+extern int kernel_sendpage(struct socket *sock, struct page *page,
+ struct skb_frag_destructor *destroy,
+ int offset,
size_t size, int flags);
extern int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg);
extern int kernel_sock_shutdown(struct socket *sock,
diff --git a/include/net/inet_common.h b/include/net/inet_common.h
index 22fac98..91cd8d0 100644
--- a/include/net/inet_common.h
+++ b/include/net/inet_common.h
@@ -21,7 +21,9 @@ extern int inet_dgram_connect(struct socket *sock, struct
sockaddr * uaddr,
extern int inet_accept(struct socket *sock, struct socket *newsock, int flags);
extern int inet_sendmsg(struct kiocb *iocb, struct socket *sock,
struct msghdr *msg, size_t size);
-extern ssize_t inet_sendpage(struct socket *sock, struct page *page, int
offset,
+extern ssize_t inet_sendpage(struct socket *sock, struct page *page,
+ struct skb_frag_destructor *frag,
+ int offset,
size_t size, int flags);
extern int inet_recvmsg(struct kiocb *iocb, struct socket *sock,
struct msghdr *msg, size_t size, int flags);
diff --git a/include/net/ip.h b/include/net/ip.h
index b53d65f..6bf9926 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -114,7 +114,9 @@ extern int ip_append_data(struct sock *sk, struct
flowi4 *fl4,
struct rtable **rt,
unsigned int flags);
extern int ip_generic_getfrag(void *from, char *to, int offset,
int len, int odd, struct sk_buff *skb);
-extern ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4,
struct page *page,
+extern ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4,
+ struct page *page,
+ struct skb_frag_destructor *destroy,
int offset, size_t size, int flags);
extern struct sk_buff *__ip_make_skb(struct sock *sk,
struct flowi4 *fl4,
diff --git a/include/net/sock.h b/include/net/sock.h
index a6ba1f8..c927997 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -834,6 +834,7 @@ struct proto {
size_t len, int noblock, int flags,
int *addr_len);
int (*sendpage)(struct sock *sk, struct page *page,
+ struct skb_frag_destructor *destroy,
int offset, size_t size, int flags);
int (*bind)(struct sock *sk,
struct sockaddr *uaddr, int addr_len);
@@ -1452,9 +1453,10 @@ extern int sock_no_mmap(struct
file *file,
struct socket *sock,
struct vm_area_struct *vma);
extern ssize_t sock_no_sendpage(struct socket *sock,
- struct page *page,
- int offset, size_t size,
- int flags);
+ struct page *page,
+ struct skb_frag_destructor *destroy,
+ int offset, size_t size,
+ int flags);
/*
* Functions to fill in entries in struct proto_ops when a protocol
diff --git a/include/net/tcp.h b/include/net/tcp.h
index f75a04d..7536266 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -331,7 +331,9 @@ extern void *tcp_v4_tw_get_peer(struct sock *sk);
extern int tcp_v4_tw_remember_stamp(struct inet_timewait_sock *tw);
extern int tcp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
size_t size);
-extern int tcp_sendpage(struct sock *sk, struct page *page, int offset,
+extern int tcp_sendpage(struct sock *sk, struct page *page,
+ struct skb_frag_destructor *destroy,
+ int offset,
size_t size, int flags);
extern int tcp_ioctl(struct sock *sk, int cmd, unsigned long arg);
extern int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
index ad5b708..69f049b 100644
--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -851,7 +851,7 @@ static int write_partial_msg_pages(struct ceph_connection
*con)
cpu_to_le32(crc32c(tmpcrc, base, len));
con->out_msg_pos.did_page_crc = 1;
}
- ret = kernel_sendpage(con->sock, page,
+ ret = kernel_sendpage(con->sock, page, NULL,
con->out_msg_pos.page_pos + page_shift,
len,
MSG_DONTWAIT | MSG_NOSIGNAL |
diff --git a/net/core/sock.c b/net/core/sock.c
index 9be6d0d..f56fc8c 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1965,7 +1965,9 @@ int sock_no_mmap(struct file *file, struct socket *sock,
struct vm_area_struct *
}
EXPORT_SYMBOL(sock_no_mmap);
-ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset,
size_t size, int flags)
+ssize_t sock_no_sendpage(struct socket *sock, struct page *page,
+ struct skb_frag_destructor *destroy,
+ int offset, size_t size, int flags)
{
ssize_t res;
struct msghdr msg = {.msg_flags = flags};
@@ -1975,6 +1977,8 @@ ssize_t sock_no_sendpage(struct socket *sock, struct page
*page, int offset, siz
iov.iov_len = size;
res = kernel_sendmsg(sock, &msg, &iov, 1, size);
kunmap(page);
+ /* kernel_sendmsg copies so we can destroy immediately */
+ skb_frag_destructor_unref(destroy);
return res;
}
EXPORT_SYMBOL(sock_no_sendpage);
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index fdf49fd..e55a6e1 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -748,7 +748,9 @@ int inet_sendmsg(struct kiocb *iocb, struct socket *sock,
struct msghdr *msg,
}
EXPORT_SYMBOL(inet_sendmsg);
-ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset,
+ssize_t inet_sendpage(struct socket *sock, struct page *page,
+ struct skb_frag_destructor *destroy,
+ int offset,
size_t size, int flags)
{
struct sock *sk = sock->sk;
@@ -761,8 +763,9 @@ ssize_t inet_sendpage(struct socket *sock, struct page
*page, int offset,
return -EAGAIN;
if (sk->sk_prot->sendpage)
- return sk->sk_prot->sendpage(sk, page, offset, size, flags);
- return sock_no_sendpage(sock, page, offset, size, flags);
+ return sk->sk_prot->sendpage(sk, page, destroy,
+ offset, size, flags);
+ return sock_no_sendpage(sock, page, destroy, offset, size, flags);
}
EXPORT_SYMBOL(inet_sendpage);
diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index 9e4eca6..2ce0b8e 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -1130,6 +1130,7 @@ int ip_append_data(struct sock *sk, struct flowi4 *fl4,
}
ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page
*page,
+ struct skb_frag_destructor *destroy,
int offset, size_t size, int flags)
{
struct inet_sock *inet = inet_sk(sk);
@@ -1243,11 +1244,12 @@ ssize_t ip_append_page(struct sock *sk, struct flowi4
*fl4, struct page *page,
i = skb_shinfo(skb)->nr_frags;
if (len > size)
len = size;
- if (skb_can_coalesce(skb, i, page, NULL, offset)) {
+ if (skb_can_coalesce(skb, i, page, destroy, offset)) {
skb_frag_size_add(&skb_shinfo(skb)->frags[i-1], len);
} else if (i < MAX_SKB_FRAGS) {
- get_page(page);
skb_fill_page_desc(skb, i, page, offset, len);
+ skb_frag_set_destructor(skb, i, destroy);
+ skb_frag_ref(skb, i);
} else {
err = -EMSGSIZE;
goto error;
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index b1612e9..89d4db0 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -757,8 +757,11 @@ static int tcp_send_mss(struct sock *sk, int *size_goal,
int flags)
return mss_now;
}
-static ssize_t do_tcp_sendpages(struct sock *sk, struct page **pages, int
poffset,
- size_t psize, int flags)
+static ssize_t do_tcp_sendpages(struct sock *sk,
+ struct page **pages,
+ struct skb_frag_destructor *destroy,
+ int poffset,
+ size_t psize, int flags)
{
struct tcp_sock *tp = tcp_sk(sk);
int mss_now, size_goal;
@@ -804,7 +807,7 @@ new_segment:
copy = size;
i = skb_shinfo(skb)->nr_frags;
- can_coalesce = skb_can_coalesce(skb, i, page, NULL, offset);
+ can_coalesce = skb_can_coalesce(skb, i, page, destroy, offset);
if (!can_coalesce && i >= MAX_SKB_FRAGS) {
tcp_mark_push(tp, skb);
goto new_segment;
@@ -815,8 +818,9 @@ new_segment:
if (can_coalesce) {
skb_frag_size_add(&skb_shinfo(skb)->frags[i - 1], copy);
} else {
- get_page(page);
skb_fill_page_desc(skb, i, page, offset, copy);
+ skb_frag_set_destructor(skb, i, destroy);
+ skb_frag_ref(skb, i);
}
skb->len += copy;
@@ -871,18 +875,20 @@ out_err:
return sk_stream_error(sk, flags, err);
}
-int tcp_sendpage(struct sock *sk, struct page *page, int offset,
- size_t size, int flags)
+int tcp_sendpage(struct sock *sk, struct page *page,
+ struct skb_frag_destructor *destroy,
+ int offset, size_t size, int flags)
{
ssize_t res;
if (!(sk->sk_route_caps & NETIF_F_SG) ||
!(sk->sk_route_caps & NETIF_F_ALL_CSUM))
- return sock_no_sendpage(sk->sk_socket, page, offset, size,
- flags);
+ return sock_no_sendpage(sk->sk_socket, page, destroy,
+ offset, size, flags);
lock_sock(sk);
- res = do_tcp_sendpages(sk, &page, offset, size, flags);
+ res = do_tcp_sendpages(sk, &page, destroy,
+ offset, size, flags);
release_sock(sk);
return res;
}
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index d6f5fee..f9038e4 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -1032,8 +1032,9 @@ do_confirm:
}
EXPORT_SYMBOL(udp_sendmsg);
-int udp_sendpage(struct sock *sk, struct page *page, int offset,
- size_t size, int flags)
+int udp_sendpage(struct sock *sk, struct page *page,
+ struct skb_frag_destructor *destroy,
+ int offset, size_t size, int flags)
{
struct inet_sock *inet = inet_sk(sk);
struct udp_sock *up = udp_sk(sk);
@@ -1061,11 +1062,11 @@ int udp_sendpage(struct sock *sk, struct page *page,
int offset,
}
ret = ip_append_page(sk, &inet->cork.fl.u.ip4,
- page, offset, size, flags);
+ page, destroy, offset, size, flags);
if (ret == -EOPNOTSUPP) {
release_sock(sk);
- return sock_no_sendpage(sk->sk_socket, page, offset,
- size, flags);
+ return sock_no_sendpage(sk->sk_socket, page, destroy,
+ offset, size, flags);
}
if (ret < 0) {
udp_flush_pending_frames(sk);
diff --git a/net/ipv4/udp_impl.h b/net/ipv4/udp_impl.h
index aaad650..4923d82 100644
--- a/net/ipv4/udp_impl.h
+++ b/net/ipv4/udp_impl.h
@@ -23,8 +23,9 @@ extern int compat_udp_getsockopt(struct sock *sk, int
level, int optname,
#endif
extern int udp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr
*msg,
size_t len, int noblock, int flags, int *addr_len);
-extern int udp_sendpage(struct sock *sk, struct page *page, int offset,
- size_t size, int flags);
+extern int udp_sendpage(struct sock *sk, struct page *page,
+ struct skb_frag_destructor *destroy,
+ int offset, size_t size, int flags);
extern int udp_queue_rcv_skb(struct sock * sk, struct sk_buff *skb);
extern void udp_destroy_sock(struct sock *sk);
diff --git a/net/rds/tcp_send.c b/net/rds/tcp_send.c
index 1b4fd68..71503ad 100644
--- a/net/rds/tcp_send.c
+++ b/net/rds/tcp_send.c
@@ -119,6 +119,7 @@ int rds_tcp_xmit(struct rds_connection *conn, struct
rds_message *rm,
while (sg < rm->data.op_nents) {
ret = tc->t_sock->ops->sendpage(tc->t_sock,
sg_page(&rm->data.op_sg[sg]),
+ NULL,
rm->data.op_sg[sg].offset + off,
rm->data.op_sg[sg].length - off,
MSG_DONTWAIT|MSG_NOSIGNAL);
diff --git a/net/socket.c b/net/socket.c
index 12a48d8..d0c0d8d 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -815,7 +815,7 @@ static ssize_t sock_sendpage(struct file *file, struct page
*page,
if (more)
flags |= MSG_MORE;
- return kernel_sendpage(sock, page, offset, size, flags);
+ return kernel_sendpage(sock, page, NULL, offset, size, flags);
}
static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
@@ -3350,15 +3350,18 @@ int kernel_setsockopt(struct socket *sock, int level,
int optname,
}
EXPORT_SYMBOL(kernel_setsockopt);
-int kernel_sendpage(struct socket *sock, struct page *page, int offset,
+int kernel_sendpage(struct socket *sock, struct page *page,
+ struct skb_frag_destructor *destroy,
+ int offset,
size_t size, int flags)
{
sock_update_classid(sock->sk);
if (sock->ops->sendpage)
- return sock->ops->sendpage(sock, page, offset, size, flags);
+ return sock->ops->sendpage(sock, page, destroy,
+ offset, size, flags);
- return sock_no_sendpage(sock, page, offset, size, flags);
+ return sock_no_sendpage(sock, page, destroy, offset, size, flags);
}
EXPORT_SYMBOL(kernel_sendpage);
diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c
index 40ae884..706305b 100644
--- a/net/sunrpc/svcsock.c
+++ b/net/sunrpc/svcsock.c
@@ -185,7 +185,7 @@ int svc_send_common(struct socket *sock, struct xdr_buf
*xdr,
/* send head */
if (slen == xdr->head[0].iov_len)
flags = 0;
- len = kernel_sendpage(sock, headpage, headoffset,
+ len = kernel_sendpage(sock, headpage, NULL, headoffset,
xdr->head[0].iov_len, flags);
if (len != xdr->head[0].iov_len)
goto out;
@@ -198,7 +198,7 @@ int svc_send_common(struct socket *sock, struct xdr_buf
*xdr,
while (pglen > 0) {
if (slen == size)
flags = 0;
- result = kernel_sendpage(sock, *ppage, base, size, flags);
+ result = kernel_sendpage(sock, *ppage, NULL, base, size, flags);
if (result > 0)
len += result;
if (result != size)
@@ -212,7 +212,7 @@ int svc_send_common(struct socket *sock, struct xdr_buf
*xdr,
/* send tail */
if (xdr->tail[0].iov_len) {
- result = kernel_sendpage(sock, tailpage, tailoffset,
+ result = kernel_sendpage(sock, tailpage, NULL, tailoffset,
xdr->tail[0].iov_len, 0);
if (result > 0)
len += result;
diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index 92bc518..f05082b 100644
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -408,7 +408,7 @@ static int xs_send_pagedata(struct socket *sock, struct
xdr_buf *xdr, unsigned i
remainder -= len;
if (remainder != 0 || more)
flags |= MSG_MORE;
- err = sock->ops->sendpage(sock, *ppage, base, len, flags);
+ err = sock->ops->sendpage(sock, *ppage, NULL, base, len, flags);
if (remainder == 0 || err != len)
break;
sent += err;
--
1.7.2.5
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