aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorSowmini Varadhan <sowmini.varadhan@oracle.com>2018-03-06 07:22:34 -0800
committerDavid S. Miller <davem@davemloft.net>2018-03-07 18:05:57 -0500
commit9426bbc6de99b8649d897b94e8f5916b58195643 (patch)
treed93a41326f290e18a791ab19fcb02434ed0e14c1
parentd40a126b16ea851f858f97b0e214d97c8355cecb (diff)
downloadlinux-stericsson-9426bbc6de99b8649d897b94e8f5916b58195643.tar.gz
rds: use list structure to track information for zerocopy completion notification
Commit 401910db4cd4 ("rds: deliver zerocopy completion notification with data") removes support fo r zerocopy completion notification on the sk_error_queue, thus we no longer need to track the cookie information in sk_buff structures. This commit removes the struct sk_buff_head rs_zcookie_queue by a simpler list that results in a smaller memory footprint as well as more efficient memory_allocation time. Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com> Acked-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/rds/af_rds.c6
-rw-r--r--net/rds/message.c77
-rw-r--r--net/rds/rds.h23
-rw-r--r--net/rds/recv.c23
4 files changed, 85 insertions, 44 deletions
diff --git a/net/rds/af_rds.c b/net/rds/af_rds.c
index f7126108a811..ab751a150f70 100644
--- a/net/rds/af_rds.c
+++ b/net/rds/af_rds.c
@@ -77,7 +77,7 @@ static int rds_release(struct socket *sock)
rds_send_drop_to(rs, NULL);
rds_rdma_drop_keys(rs);
rds_notify_queue_get(rs, NULL);
- __skb_queue_purge(&rs->rs_zcookie_queue);
+ rds_notify_msg_zcopy_purge(&rs->rs_zcookie_queue);
spin_lock_bh(&rds_sock_lock);
list_del_init(&rs->rs_item);
@@ -180,7 +180,7 @@ static __poll_t rds_poll(struct file *file, struct socket *sock,
}
if (!list_empty(&rs->rs_recv_queue) ||
!list_empty(&rs->rs_notify_queue) ||
- !skb_queue_empty(&rs->rs_zcookie_queue))
+ !list_empty(&rs->rs_zcookie_queue.zcookie_head))
mask |= (EPOLLIN | EPOLLRDNORM);
if (rs->rs_snd_bytes < rds_sk_sndbuf(rs))
mask |= (EPOLLOUT | EPOLLWRNORM);
@@ -515,7 +515,7 @@ static int __rds_create(struct socket *sock, struct sock *sk, int protocol)
INIT_LIST_HEAD(&rs->rs_recv_queue);
INIT_LIST_HEAD(&rs->rs_notify_queue);
INIT_LIST_HEAD(&rs->rs_cong_list);
- skb_queue_head_init(&rs->rs_zcookie_queue);
+ rds_message_zcopy_queue_init(&rs->rs_zcookie_queue);
spin_lock_init(&rs->rs_rdma_lock);
rs->rs_rdma_keys = RB_ROOT;
rs->rs_rx_traces = 0;
diff --git a/net/rds/message.c b/net/rds/message.c
index c36edbb92c34..90dcdcfe9f62 100644
--- a/net/rds/message.c
+++ b/net/rds/message.c
@@ -48,7 +48,6 @@ static unsigned int rds_exthdr_size[__RDS_EXTHDR_MAX] = {
[RDS_EXTHDR_GEN_NUM] = sizeof(u32),
};
-
void rds_message_addref(struct rds_message *rm)
{
rdsdebug("addref rm %p ref %d\n", rm, refcount_read(&rm->m_refcount));
@@ -56,9 +55,9 @@ void rds_message_addref(struct rds_message *rm)
}
EXPORT_SYMBOL_GPL(rds_message_addref);
-static inline bool skb_zcookie_add(struct sk_buff *skb, u32 cookie)
+static inline bool rds_zcookie_add(struct rds_msg_zcopy_info *info, u32 cookie)
{
- struct rds_zcopy_cookies *ck = (struct rds_zcopy_cookies *)skb->cb;
+ struct rds_zcopy_cookies *ck = &info->zcookies;
int ncookies = ck->num;
if (ncookies == RDS_MAX_ZCOOKIES)
@@ -68,38 +67,61 @@ static inline bool skb_zcookie_add(struct sk_buff *skb, u32 cookie)
return true;
}
+struct rds_msg_zcopy_info *rds_info_from_znotifier(struct rds_znotifier *znotif)
+{
+ return container_of(znotif, struct rds_msg_zcopy_info, znotif);
+}
+
+void rds_notify_msg_zcopy_purge(struct rds_msg_zcopy_queue *q)
+{
+ unsigned long flags;
+ LIST_HEAD(copy);
+ struct rds_msg_zcopy_info *info, *tmp;
+
+ spin_lock_irqsave(&q->lock, flags);
+ list_splice(&q->zcookie_head, &copy);
+ INIT_LIST_HEAD(&q->zcookie_head);
+ spin_unlock_irqrestore(&q->lock, flags);
+
+ list_for_each_entry_safe(info, tmp, &copy, rs_zcookie_next) {
+ list_del(&info->rs_zcookie_next);
+ kfree(info);
+ }
+}
+
static void rds_rm_zerocopy_callback(struct rds_sock *rs,
struct rds_znotifier *znotif)
{
- struct sk_buff *skb, *tail;
- unsigned long flags;
- struct sk_buff_head *q;
+ struct rds_msg_zcopy_info *info;
+ struct rds_msg_zcopy_queue *q;
u32 cookie = znotif->z_cookie;
struct rds_zcopy_cookies *ck;
+ struct list_head *head;
+ unsigned long flags;
+ mm_unaccount_pinned_pages(&znotif->z_mmp);
q = &rs->rs_zcookie_queue;
spin_lock_irqsave(&q->lock, flags);
- tail = skb_peek_tail(q);
-
- if (tail && skb_zcookie_add(tail, cookie)) {
- spin_unlock_irqrestore(&q->lock, flags);
- mm_unaccount_pinned_pages(&znotif->z_mmp);
- consume_skb(rds_skb_from_znotifier(znotif));
- /* caller invokes rds_wake_sk_sleep() */
- return;
+ head = &q->zcookie_head;
+ if (!list_empty(head)) {
+ info = list_entry(head, struct rds_msg_zcopy_info,
+ rs_zcookie_next);
+ if (info && rds_zcookie_add(info, cookie)) {
+ spin_unlock_irqrestore(&q->lock, flags);
+ kfree(rds_info_from_znotifier(znotif));
+ /* caller invokes rds_wake_sk_sleep() */
+ return;
+ }
}
- skb = rds_skb_from_znotifier(znotif);
- ck = (struct rds_zcopy_cookies *)skb->cb;
+ info = rds_info_from_znotifier(znotif);
+ ck = &info->zcookies;
memset(ck, 0, sizeof(*ck));
- WARN_ON(!skb_zcookie_add(skb, cookie));
-
- __skb_queue_tail(q, skb);
+ WARN_ON(!rds_zcookie_add(info, cookie));
+ list_add_tail(&q->zcookie_head, &info->rs_zcookie_next);
spin_unlock_irqrestore(&q->lock, flags);
/* caller invokes rds_wake_sk_sleep() */
-
- mm_unaccount_pinned_pages(&znotif->z_mmp);
}
/*
@@ -340,7 +362,7 @@ int rds_message_zcopy_from_user(struct rds_message *rm, struct iov_iter *from)
int ret = 0;
int length = iov_iter_count(from);
int total_copied = 0;
- struct sk_buff *skb;
+ struct rds_msg_zcopy_info *info;
rm->m_inc.i_hdr.h_len = cpu_to_be32(iov_iter_count(from));
@@ -350,12 +372,11 @@ int rds_message_zcopy_from_user(struct rds_message *rm, struct iov_iter *from)
sg = rm->data.op_sg;
sg_off = 0; /* Dear gcc, sg->page will be null from kzalloc. */
- skb = alloc_skb(0, GFP_KERNEL);
- if (!skb)
+ info = kzalloc(sizeof(*info), GFP_KERNEL);
+ if (!info)
return -ENOMEM;
- BUILD_BUG_ON(sizeof(skb->cb) < max_t(int, sizeof(struct rds_znotifier),
- sizeof(struct rds_zcopy_cookies)));
- rm->data.op_mmp_znotifier = RDS_ZCOPY_SKB(skb);
+ INIT_LIST_HEAD(&info->rs_zcookie_next);
+ rm->data.op_mmp_znotifier = &info->znotif;
if (mm_account_pinned_pages(&rm->data.op_mmp_znotifier->z_mmp,
length)) {
ret = -ENOMEM;
@@ -389,7 +410,7 @@ int rds_message_zcopy_from_user(struct rds_message *rm, struct iov_iter *from)
WARN_ON_ONCE(length != 0);
return ret;
err:
- consume_skb(skb);
+ kfree(info);
rm->data.op_mmp_znotifier = NULL;
return ret;
}
diff --git a/net/rds/rds.h b/net/rds/rds.h
index 33b16353d8f3..74cd27c661de 100644
--- a/net/rds/rds.h
+++ b/net/rds/rds.h
@@ -357,16 +357,27 @@ static inline u32 rds_rdma_cookie_offset(rds_rdma_cookie_t cookie)
#define RDS_MSG_FLUSH 8
struct rds_znotifier {
- struct list_head z_list;
struct mmpin z_mmp;
u32 z_cookie;
};
-#define RDS_ZCOPY_SKB(__skb) ((struct rds_znotifier *)&((__skb)->cb[0]))
+struct rds_msg_zcopy_info {
+ struct list_head rs_zcookie_next;
+ union {
+ struct rds_znotifier znotif;
+ struct rds_zcopy_cookies zcookies;
+ };
+};
-static inline struct sk_buff *rds_skb_from_znotifier(struct rds_znotifier *z)
+struct rds_msg_zcopy_queue {
+ struct list_head zcookie_head;
+ spinlock_t lock; /* protects zcookie_head queue */
+};
+
+static inline void rds_message_zcopy_queue_init(struct rds_msg_zcopy_queue *q)
{
- return container_of((void *)z, struct sk_buff, cb);
+ spin_lock_init(&q->lock);
+ INIT_LIST_HEAD(&q->zcookie_head);
}
struct rds_message {
@@ -603,8 +614,7 @@ struct rds_sock {
/* Socket receive path trace points*/
u8 rs_rx_traces;
u8 rs_rx_trace[RDS_MSG_RX_DGRAM_TRACE_MAX];
-
- struct sk_buff_head rs_zcookie_queue;
+ struct rds_msg_zcopy_queue rs_zcookie_queue;
};
static inline struct rds_sock *rds_sk_to_rs(const struct sock *sk)
@@ -803,6 +813,7 @@ void rds_message_addref(struct rds_message *rm);
void rds_message_put(struct rds_message *rm);
void rds_message_wait(struct rds_message *rm);
void rds_message_unmapped(struct rds_message *rm);
+void rds_notify_msg_zcopy_purge(struct rds_msg_zcopy_queue *info);
static inline void rds_message_make_checksum(struct rds_header *hdr)
{
diff --git a/net/rds/recv.c b/net/rds/recv.c
index d50747725221..de50e2126e40 100644
--- a/net/rds/recv.c
+++ b/net/rds/recv.c
@@ -579,9 +579,10 @@ out:
static bool rds_recvmsg_zcookie(struct rds_sock *rs, struct msghdr *msg)
{
- struct sk_buff *skb;
- struct sk_buff_head *q = &rs->rs_zcookie_queue;
+ struct rds_msg_zcopy_queue *q = &rs->rs_zcookie_queue;
+ struct rds_msg_zcopy_info *info = NULL;
struct rds_zcopy_cookies *done;
+ unsigned long flags;
if (!msg->msg_control)
return false;
@@ -590,16 +591,24 @@ static bool rds_recvmsg_zcookie(struct rds_sock *rs, struct msghdr *msg)
msg->msg_controllen < CMSG_SPACE(sizeof(*done)))
return false;
- skb = skb_dequeue(q);
- if (!skb)
+ spin_lock_irqsave(&q->lock, flags);
+ if (!list_empty(&q->zcookie_head)) {
+ info = list_entry(q->zcookie_head.next,
+ struct rds_msg_zcopy_info, rs_zcookie_next);
+ list_del(&info->rs_zcookie_next);
+ }
+ spin_unlock_irqrestore(&q->lock, flags);
+ if (!info)
return false;
- done = (struct rds_zcopy_cookies *)skb->cb;
+ done = &info->zcookies;
if (put_cmsg(msg, SOL_RDS, RDS_CMSG_ZCOPY_COMPLETION, sizeof(*done),
done)) {
- skb_queue_head(q, skb);
+ spin_lock_irqsave(&q->lock, flags);
+ list_add(&info->rs_zcookie_next, &q->zcookie_head);
+ spin_unlock_irqrestore(&q->lock, flags);
return false;
}
- consume_skb(skb);
+ kfree(info);
return true;
}