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rds: use list structure to track information for zerocopy completion notification

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Commit 401910db4c ("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>
This commit is contained in:
Sowmini Varadhan
2018-03-06 07:22:34 -08:00
committed by David S. Miller
parent d40a126b16
commit 9426bbc6de
4 changed files with 85 additions and 44 deletions
Download Patch File Download Diff File Expand all files Collapse all files
net/rds/message.c
+49 -28
View File
@@ -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;
}