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net: add __pskb_copy_fclone and pskb_copy_for_clone 

There are several instances where a pskb_copy or __pskb_copy is
immediately followed by an skb_clone.

Add a couple of new functions to allow the copy skb to be allocated
from the fclone cache and thus speed up subsequent skb_clone calls.

Cc: Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
Cc: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Cc: Marek Lindner <mareklindner@neomailbox.ch>
Cc: Simon Wunderlich <sw@simonwunderlich.de>
Cc: Antonio Quartulli <antonio@meshcoding.com>
Cc: Marcel Holtmann <marcel@holtmann.org>
Cc: Gustavo Padovan <gustavo@padovan.org>
Cc: Johan Hedberg <johan.hedberg@gmail.com>
Cc: Arvid Brodin <arvid.brodin@alten.se>
Cc: Patrick McHardy <kaber@trash.net>
Cc: Pablo Neira Ayuso <pablo@netfilter.org>
Cc: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Cc: Lauro Ramos Venancio <lauro.venancio@openbossa.org>
Cc: Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
Cc: Samuel Ortiz <sameo@linux.intel.com>
Cc: Jon Maloy <jon.maloy@ericsson.com>
Cc: Allan Stephens <allan.stephens@windriver.com>
Cc: Andrew Hendry <andrew.hendry@gmail.com>
Cc: Eric Dumazet <edumazet@google.com>
Reviewed-by: Christoph Paasch <christoph.paasch@uclouvain.be>
Signed-off-by: Octavian Purdila <octavian.purdila@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Octavian Purdila 2014-06-12 01:36:26 +03:00 committed by David S. Miller
parent 1a0b20b257
commit bad93e9d4e
8 changed files with 34 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
include/linux/skbuff.h
View File

@ -744,7 +744,13 @@ struct sk_buff *skb_morph(struct sk_buff *dst, struct sk_buff *src);
int skb_copy_ubufs(struct sk_buff *skb, gfp_t gfp_mask);
struct sk_buff *skb_clone(struct sk_buff *skb, gfp_t priority);
struct sk_buff *skb_copy(const struct sk_buff *skb, gfp_t priority);
struct sk_buff *__pskb_copy(struct sk_buff *skb, int headroom, gfp_t gfp_mask);
struct sk_buff *__pskb_copy_fclone(struct sk_buff *skb, int headroom,
gfp_t gfp_mask, bool fclone);
static inline struct sk_buff *__pskb_copy(struct sk_buff *skb, int headroom,
gfp_t gfp_mask)
{
return __pskb_copy_fclone(skb, headroom, gfp_mask, false);
}
int pskb_expand_head(struct sk_buff *skb, int nhead, int ntail, gfp_t gfp_mask);
struct sk_buff *skb_realloc_headroom(struct sk_buff *skb,
@ -2238,6 +2244,14 @@ static inline struct sk_buff *pskb_copy(struct sk_buff *skb,
return __pskb_copy(skb, skb_headroom(skb), gfp_mask);
}
static inline struct sk_buff *pskb_copy_for_clone(struct sk_buff *skb,
gfp_t gfp_mask)
{
return __pskb_copy_fclone(skb, skb_headroom(skb), gfp_mask, true);
}
/**
* skb_clone_writable - is the header of a clone writable
* @skb: buffer to check

2
net/batman-adv/distributed-arp-table.c
View File

@ -594,7 +594,7 @@ static bool batadv_dat_send_data(struct batadv_priv *bat_priv,
if (!neigh_node)
goto free_orig;
tmp_skb = pskb_copy(skb, GFP_ATOMIC);
tmp_skb = pskb_copy_for_clone(skb, GFP_ATOMIC);
if (!batadv_send_skb_prepare_unicast_4addr(bat_priv, tmp_skb,
cand[i].orig_node,
packet_subtype)) {

2
net/batman-adv/network-coding.c
View File

@ -1344,7 +1344,7 @@ static void batadv_nc_skb_store_before_coding(struct batadv_priv *bat_priv,
struct ethhdr *ethhdr;
/* Copy skb header to change the mac header */
skb = pskb_copy(skb, GFP_ATOMIC);
skb = pskb_copy_for_clone(skb, GFP_ATOMIC);
if (!skb)
return;

6
net/bluetooth/hci_sock.c
View File

@ -143,7 +143,7 @@ void hci_send_to_sock(struct hci_dev *hdev, struct sk_buff *skb)
if (!skb_copy) {
/* Create a private copy with headroom */
skb_copy = __pskb_copy(skb, 1, GFP_ATOMIC);
skb_copy = __pskb_copy_fclone(skb, 1, GFP_ATOMIC, true);
if (!skb_copy)
continue;
@ -247,8 +247,8 @@ void hci_send_to_monitor(struct hci_dev *hdev, struct sk_buff *skb)
struct hci_mon_hdr *hdr;
/* Create a private copy with headroom */
skb_copy = __pskb_copy(skb, HCI_MON_HDR_SIZE,
GFP_ATOMIC);
skb_copy = __pskb_copy_fclone(skb, HCI_MON_HDR_SIZE,
GFP_ATOMIC, true);
if (!skb_copy)
continue;

14
net/core/skbuff.c
View File

@ -951,10 +951,13 @@ struct sk_buff *skb_copy(const struct sk_buff *skb, gfp_t gfp_mask)
EXPORT_SYMBOL(skb_copy);
/**
* __pskb_copy - create copy of an sk_buff with private head.
* __pskb_copy_fclone - create copy of an sk_buff with private head.
* @skb: buffer to copy
* @headroom: headroom of new skb
* @gfp_mask: allocation priority
* @fclone: if true allocate the copy of the skb from the fclone
* cache instead of the head cache; it is recommended to set this
* to true for the cases where the copy will likely be cloned
*
* Make a copy of both an &sk_buff and part of its data, located
* in header. Fragmented data remain shared. This is used when
@ -964,11 +967,12 @@ EXPORT_SYMBOL(skb_copy);
* The returned buffer has a reference count of 1.
*/
struct sk_buff *__pskb_copy(struct sk_buff *skb, int headroom, gfp_t gfp_mask)
struct sk_buff *__pskb_copy_fclone(struct sk_buff *skb, int headroom,
gfp_t gfp_mask, bool fclone)
{
unsigned int size = skb_headlen(skb) + headroom;
struct sk_buff *n = __alloc_skb(size, gfp_mask,
skb_alloc_rx_flag(skb), NUMA_NO_NODE);
int flags = skb_alloc_rx_flag(skb) | (fclone ? SKB_ALLOC_FCLONE : 0);
struct sk_buff *n = __alloc_skb(size, gfp_mask, flags, NUMA_NO_NODE);
if (!n)
goto out;
@ -1008,7 +1012,7 @@ struct sk_buff *__pskb_copy(struct sk_buff *skb, int headroom, gfp_t gfp_mask)
out:
return n;
}
EXPORT_SYMBOL(__pskb_copy);
EXPORT_SYMBOL(__pskb_copy_fclone);
/**
* pskb_expand_head - reallocate header of &sk_buff

4
net/nfc/llcp_core.c
View File

@ -680,8 +680,8 @@ void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
continue;
if (skb_copy == NULL) {
skb_copy = __pskb_copy(skb, NFC_RAW_HEADER_SIZE,
GFP_ATOMIC);
skb_copy = __pskb_copy_fclone(skb, NFC_RAW_HEADER_SIZE,
GFP_ATOMIC, true);
if (skb_copy == NULL)
continue;

4
net/nfc/rawsock.c
View File

@ -378,8 +378,8 @@ void nfc_send_to_raw_sock(struct nfc_dev *dev, struct sk_buff *skb,
sk_for_each(sk, &raw_sk_list.head) {
if (!skb_copy) {
skb_copy = __pskb_copy(skb, NFC_RAW_HEADER_SIZE,
GFP_ATOMIC);
skb_copy = __pskb_copy_fclone(skb, NFC_RAW_HEADER_SIZE,
GFP_ATOMIC, true);
if (!skb_copy)
continue;

2
net/tipc/bcast.c
View File

@ -653,7 +653,7 @@ static int tipc_bcbearer_send(struct sk_buff *buf, struct tipc_bearer *unused1,
tipc_bearer_send(b->identity, buf, &b->bcast_addr);
} else {
/* Avoid concurrent buffer access */
tbuf = pskb_copy(buf, GFP_ATOMIC);
tbuf = pskb_copy_for_clone(buf, GFP_ATOMIC);
if (!tbuf)
break;
tipc_bearer_send(b->identity, tbuf, &b->bcast_addr);