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Date: Thu, 12 Jun 2014 00:41:27 +0300
From: Octavian Purdila <octavian.purdila@...el.com>
To: netdev@...r.kernel.org
Cc: christoph.paasch@...ouvain.be,
Octavian Purdila <octavian.purdila@...el.com>,
Alexander Smirnov <alex.bluesman.smirnov@...il.com>,
Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
Marek Lindner <mareklindner@...mailbox.ch>,
Simon Wunderlich <sw@...onwunderlich.de>,
Antonio Quartulli <antonio@...hcoding.com>,
Marcel Holtmann <marcel@...tmann.org>,
Gustavo Padovan <gustavo@...ovan.org>,
Johan Hedberg <johan.hedberg@...il.com>,
Arvid Brodin <arvid.brodin@...en.se>,
Patrick McHardy <kaber@...sh.net>,
Pablo Neira Ayuso <pablo@...filter.org>,
Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
Lauro Ramos Venancio <lauro.venancio@...nbossa.org>,
Aloisio Almeida Jr <aloisio.almeida@...nbossa.org>,
Samuel Ortiz <sameo@...ux.intel.com>,
Jon Maloy <jon.maloy@...csson.com>,
Allan Stephens <allan.stephens@...driver.com>,
Andrew Hendry <andrew.hendry@...il.com>,
Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next v4] 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@...il.com>
Cc: Dmitry Eremin-Solenikov <dbaryshkov@...il.com>
Cc: Marek Lindner <mareklindner@...mailbox.ch>
Cc: Simon Wunderlich <sw@...onwunderlich.de>
Cc: Antonio Quartulli <antonio@...hcoding.com>
Cc: Marcel Holtmann <marcel@...tmann.org>
Cc: Gustavo Padovan <gustavo@...ovan.org>
Cc: Johan Hedberg <johan.hedberg@...il.com>
Cc: Arvid Brodin <arvid.brodin@...en.se>
Cc: Patrick McHardy <kaber@...sh.net>
Cc: Pablo Neira Ayuso <pablo@...filter.org>
Cc: Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>
Cc: Lauro Ramos Venancio <lauro.venancio@...nbossa.org>
Cc: Aloisio Almeida Jr <aloisio.almeida@...nbossa.org>
Cc: Samuel Ortiz <sameo@...ux.intel.com>
Cc: Jon Maloy <jon.maloy@...csson.com>
Cc: Allan Stephens <allan.stephens@...driver.com>
Cc: Andrew Hendry <andrew.hendry@...il.com>
Cc: Eric Dumazet <edumazet@...gle.com>
Reviewed-by: Christoph Paasch <christoph.paasch@...ouvain.be>
Signed-off-by: Octavian Purdila <octavian.purdila@...el.com>
---
Changes since v3:
* As suggested by David and Dave add new functions to keep the
existing signatures unchanged and avoid unnecessary changes
Changes since v2:
* As suggested by Dave, use a bool instead of directly exposing the
internal allocation flags
Changes since v1:
* add new parameter to pskb_copy as well, as suggested by Christoph
include/linux/skbuff.h | 18 ++++++++++++++++--
net/batman-adv/distributed-arp-table.c | 2 +-
net/batman-adv/network-coding.c | 2 +-
net/bluetooth/hci_sock.c | 6 +++---
net/core/skbuff.c | 14 +++++++++-----
net/nfc/llcp_core.c | 4 ++--
net/nfc/rawsock.c | 4 ++--
net/tipc/bcast.c | 2 +-
8 files changed, 35 insertions(+), 17 deletions(-)
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index c705808..db756a0 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -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,
@@ -2235,9 +2241,17 @@ static inline dma_addr_t skb_frag_dma_map(struct device *dev,
static inline struct sk_buff *pskb_copy(struct sk_buff *skb,
gfp_t gfp_mask)
{
- return __pskb_copy(skb, skb_headroom(skb), gfp_mask);
+ return __pskb_copy_fclone(skb, skb_headroom(skb), gfp_mask, false);
}
+
+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
diff --git a/net/batman-adv/distributed-arp-table.c b/net/batman-adv/distributed-arp-table.c
index dcd99b2..f2c066b 100644
--- a/net/batman-adv/distributed-arp-table.c
+++ b/net/batman-adv/distributed-arp-table.c
@@ -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)) {
diff --git a/net/batman-adv/network-coding.c b/net/batman-adv/network-coding.c
index 40a2fc4..8d04d17 100644
--- a/net/batman-adv/network-coding.c
+++ b/net/batman-adv/network-coding.c
@@ -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;
diff --git a/net/bluetooth/hci_sock.c b/net/bluetooth/hci_sock.c
index f608bff..80d25c1 100644
--- a/net/bluetooth/hci_sock.c
+++ b/net/bluetooth/hci_sock.c
@@ -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;
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 05f4bef..b9e85e6 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -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
diff --git a/net/nfc/llcp_core.c b/net/nfc/llcp_core.c
index f6278da..51e7887 100644
--- a/net/nfc/llcp_core.c
+++ b/net/nfc/llcp_core.c
@@ -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;
diff --git a/net/nfc/rawsock.c b/net/nfc/rawsock.c
index 55eefee..11c3544 100644
--- a/net/nfc/rawsock.c
+++ b/net/nfc/rawsock.c
@@ -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;
diff --git a/net/tipc/bcast.c b/net/tipc/bcast.c
index 671f981..2663167 100644
--- a/net/tipc/bcast.c
+++ b/net/tipc/bcast.c
@@ -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);
--
1.8.3.2
--
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