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Date: Sun, 2 Dec 2007 19:36:53 -0200
From: Arnaldo Carvalho de Melo <acme@...hat.com>
To: Gerrit Renker <gerrit@....abdn.ac.uk>
Cc: netdev@...r.kernel.org, dccp@...r.kernel.org,
Ingo Molnar <mingo@...e.hu>,
Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: [PATCH 4/7] [TFRC]: Make the rx history slab be global
This is in preparation for merging the new rx history code written by Gerrit Renker.
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
net/dccp/ccids/ccid3.c | 35 ++-----------
net/dccp/ccids/lib/packet_history.c | 95 ++++++++++++++++++-----------------
net/dccp/ccids/lib/packet_history.h | 43 ++--------------
3 files changed, 60 insertions(+), 113 deletions(-)
diff --git a/net/dccp/ccids/ccid3.c b/net/dccp/ccids/ccid3.c
index 5dea690..07920bb 100644
--- a/net/dccp/ccids/ccid3.c
+++ b/net/dccp/ccids/ccid3.c
@@ -49,8 +49,6 @@ static int ccid3_debug;
#define ccid3_pr_debug(format, a...)
#endif
-static struct dccp_rx_hist *ccid3_rx_hist;
-
/*
* Transmitter Half-Connection Routines
*/
@@ -807,9 +805,9 @@ static int ccid3_hc_rx_detect_loss(struct sock *sk,
}
detect_out:
- dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist,
- &hcrx->ccid3hcrx_li_hist, packet,
- hcrx->ccid3hcrx_seqno_nonloss);
+ dccp_rx_hist_add_packet(&hcrx->ccid3hcrx_hist,
+ &hcrx->ccid3hcrx_li_hist, packet,
+ hcrx->ccid3hcrx_seqno_nonloss);
return loss;
}
@@ -852,8 +850,7 @@ static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
return;
}
- packet = dccp_rx_hist_entry_new(ccid3_rx_hist, opt_recv->dccpor_ndp,
- skb, GFP_ATOMIC);
+ packet = dccp_rx_hist_entry_new(opt_recv->dccpor_ndp, skb, GFP_ATOMIC);
if (unlikely(packet == NULL)) {
DCCP_WARN("%s(%p), Not enough mem to add rx packet "
"to history, consider it lost!\n", dccp_role(sk), sk);
@@ -936,7 +933,7 @@ static void ccid3_hc_rx_exit(struct sock *sk)
ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM);
/* Empty packet history */
- dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist);
+ dccp_rx_hist_purge(&hcrx->ccid3hcrx_hist);
/* Empty loss interval history */
dccp_li_hist_purge(&hcrx->ccid3hcrx_li_hist);
@@ -1013,33 +1010,13 @@ MODULE_PARM_DESC(ccid3_debug, "Enable debug messages");
static __init int ccid3_module_init(void)
{
- int rc = -ENOBUFS;
-
- ccid3_rx_hist = dccp_rx_hist_new("ccid3");
- if (ccid3_rx_hist == NULL)
- goto out;
-
- rc = ccid_register(&ccid3);
- if (rc != 0)
- goto out_free_rx;
-out:
- return rc;
-
-out_free_rx:
- dccp_rx_hist_delete(ccid3_rx_hist);
- ccid3_rx_hist = NULL;
- goto out;
+ return ccid_register(&ccid3);
}
module_init(ccid3_module_init);
static __exit void ccid3_module_exit(void)
{
ccid_unregister(&ccid3);
-
- if (ccid3_rx_hist != NULL) {
- dccp_rx_hist_delete(ccid3_rx_hist);
- ccid3_rx_hist = NULL;
- }
}
module_exit(ccid3_module_exit);
diff --git a/net/dccp/ccids/lib/packet_history.c b/net/dccp/ccids/lib/packet_history.c
index b628714..e1ab853 100644
--- a/net/dccp/ccids/lib/packet_history.c
+++ b/net/dccp/ccids/lib/packet_history.c
@@ -114,48 +114,33 @@ EXPORT_SYMBOL_GPL(tfrc_tx_hist_rtt);
/*
* Receiver History Routines
*/
-struct dccp_rx_hist *dccp_rx_hist_new(const char *name)
+static struct kmem_cache *tfrc_rx_hist_slab;
+
+struct dccp_rx_hist_entry *dccp_rx_hist_entry_new(const u32 ndp,
+ const struct sk_buff *skb,
+ const gfp_t prio)
{
- struct dccp_rx_hist *hist = kmalloc(sizeof(*hist), GFP_ATOMIC);
- static const char dccp_rx_hist_mask[] = "rx_hist_%s";
- char *slab_name;
-
- if (hist == NULL)
- goto out;
-
- slab_name = kmalloc(strlen(name) + sizeof(dccp_rx_hist_mask) - 1,
- GFP_ATOMIC);
- if (slab_name == NULL)
- goto out_free_hist;
-
- sprintf(slab_name, dccp_rx_hist_mask, name);
- hist->dccprxh_slab = kmem_cache_create(slab_name,
- sizeof(struct dccp_rx_hist_entry),
- 0, SLAB_HWCACHE_ALIGN, NULL);
- if (hist->dccprxh_slab == NULL)
- goto out_free_slab_name;
-out:
- return hist;
-out_free_slab_name:
- kfree(slab_name);
-out_free_hist:
- kfree(hist);
- hist = NULL;
- goto out;
-}
+ struct dccp_rx_hist_entry *entry = kmem_cache_alloc(tfrc_rx_hist_slab,
+ prio);
-EXPORT_SYMBOL_GPL(dccp_rx_hist_new);
+ if (entry != NULL) {
+ const struct dccp_hdr *dh = dccp_hdr(skb);
-void dccp_rx_hist_delete(struct dccp_rx_hist *hist)
-{
- const char* name = kmem_cache_name(hist->dccprxh_slab);
+ entry->dccphrx_seqno = DCCP_SKB_CB(skb)->dccpd_seq;
+ entry->dccphrx_ccval = dh->dccph_ccval;
+ entry->dccphrx_type = dh->dccph_type;
+ entry->dccphrx_ndp = ndp;
+ entry->dccphrx_tstamp = ktime_get_real();
+ }
- kmem_cache_destroy(hist->dccprxh_slab);
- kfree(name);
- kfree(hist);
+ return entry;
}
+EXPORT_SYMBOL_GPL(dccp_rx_hist_entry_new);
-EXPORT_SYMBOL_GPL(dccp_rx_hist_delete);
+static inline void dccp_rx_hist_entry_delete(struct dccp_rx_hist_entry *entry)
+{
+ kmem_cache_free(tfrc_rx_hist_slab, entry);
+}
int dccp_rx_hist_find_entry(const struct list_head *list, const u64 seq,
u8 *ccval)
@@ -192,11 +177,10 @@ struct dccp_rx_hist_entry *
EXPORT_SYMBOL_GPL(dccp_rx_hist_find_data_packet);
-void dccp_rx_hist_add_packet(struct dccp_rx_hist *hist,
- struct list_head *rx_list,
- struct list_head *li_list,
- struct dccp_rx_hist_entry *packet,
- u64 nonloss_seqno)
+void dccp_rx_hist_add_packet(struct list_head *rx_list,
+ struct list_head *li_list,
+ struct dccp_rx_hist_entry *packet,
+ u64 nonloss_seqno)
{
struct dccp_rx_hist_entry *entry, *next;
u8 num_later = 0;
@@ -211,7 +195,7 @@ void dccp_rx_hist_add_packet(struct dccp_rx_hist *hist,
if (after48(nonloss_seqno,
entry->dccphrx_seqno)) {
list_del_init(&entry->dccphrx_node);
- dccp_rx_hist_entry_delete(hist, entry);
+ dccp_rx_hist_entry_delete(entry);
}
} else if (dccp_rx_hist_entry_data_packet(entry))
--num_later;
@@ -253,7 +237,7 @@ void dccp_rx_hist_add_packet(struct dccp_rx_hist *hist,
break;
case 3:
list_del_init(&entry->dccphrx_node);
- dccp_rx_hist_entry_delete(hist, entry);
+ dccp_rx_hist_entry_delete(entry);
break;
}
} else if (dccp_rx_hist_entry_data_packet(entry))
@@ -264,13 +248,13 @@ void dccp_rx_hist_add_packet(struct dccp_rx_hist *hist,
EXPORT_SYMBOL_GPL(dccp_rx_hist_add_packet);
-void dccp_rx_hist_purge(struct dccp_rx_hist *hist, struct list_head *list)
+void dccp_rx_hist_purge(struct list_head *list)
{
struct dccp_rx_hist_entry *entry, *next;
list_for_each_entry_safe(entry, next, list, dccphrx_node) {
list_del_init(&entry->dccphrx_node);
- kmem_cache_free(hist->dccprxh_slab, entry);
+ dccp_rx_hist_entry_delete(entry);
}
}
@@ -281,8 +265,22 @@ __init int packet_history_init(void)
tfrc_tx_hist_slab = kmem_cache_create("tfrc_tx_hist",
sizeof(struct tfrc_tx_hist_entry), 0,
SLAB_HWCACHE_ALIGN, NULL);
+ if (tfrc_tx_hist_slab == NULL)
+ goto out_err;
- return tfrc_tx_hist_slab == NULL ? -ENOBUFS : 0;
+ tfrc_rx_hist_slab = kmem_cache_create("tfrc_rx_hist",
+ sizeof(struct dccp_rx_hist_entry), 0,
+ SLAB_HWCACHE_ALIGN, NULL);
+ if (tfrc_rx_hist_slab == NULL)
+ goto out_free_tx;
+
+ return 0;
+
+out_free_tx:
+ kmem_cache_destroy(tfrc_tx_hist_slab);
+ tfrc_tx_hist_slab = NULL;
+out_err:
+ return -ENOBUFS;
}
void packet_history_exit(void)
@@ -291,4 +289,9 @@ void packet_history_exit(void)
kmem_cache_destroy(tfrc_tx_hist_slab);
tfrc_tx_hist_slab = NULL;
}
+
+ if (tfrc_rx_hist_slab != NULL) {
+ kmem_cache_destroy(tfrc_rx_hist_slab);
+ tfrc_rx_hist_slab = NULL;
+ }
}
diff --git a/net/dccp/ccids/lib/packet_history.h b/net/dccp/ccids/lib/packet_history.h
index 9a2642e..34b180b 100644
--- a/net/dccp/ccids/lib/packet_history.h
+++ b/net/dccp/ccids/lib/packet_history.h
@@ -66,34 +66,10 @@ struct dccp_rx_hist_entry {
ktime_t dccphrx_tstamp;
};
-struct dccp_rx_hist {
- struct kmem_cache *dccprxh_slab;
-};
-
-extern struct dccp_rx_hist *dccp_rx_hist_new(const char *name);
-extern void dccp_rx_hist_delete(struct dccp_rx_hist *hist);
-
-static inline struct dccp_rx_hist_entry *
- dccp_rx_hist_entry_new(struct dccp_rx_hist *hist,
- const u32 ndp,
+extern struct dccp_rx_hist_entry *
+ dccp_rx_hist_entry_new(const u32 ndp,
const struct sk_buff *skb,
- const gfp_t prio)
-{
- struct dccp_rx_hist_entry *entry = kmem_cache_alloc(hist->dccprxh_slab,
- prio);
-
- if (entry != NULL) {
- const struct dccp_hdr *dh = dccp_hdr(skb);
-
- entry->dccphrx_seqno = DCCP_SKB_CB(skb)->dccpd_seq;
- entry->dccphrx_ccval = dh->dccph_ccval;
- entry->dccphrx_type = dh->dccph_type;
- entry->dccphrx_ndp = ndp;
- entry->dccphrx_tstamp = ktime_get_real();
- }
-
- return entry;
-}
+ const gfp_t prio);
static inline struct dccp_rx_hist_entry *
dccp_rx_hist_head(struct list_head *list)
@@ -111,21 +87,12 @@ extern int dccp_rx_hist_find_entry(const struct list_head *list, const u64 seq,
extern struct dccp_rx_hist_entry *
dccp_rx_hist_find_data_packet(const struct list_head *list);
-extern void dccp_rx_hist_add_packet(struct dccp_rx_hist *hist,
- struct list_head *rx_list,
+extern void dccp_rx_hist_add_packet(struct list_head *rx_list,
struct list_head *li_list,
struct dccp_rx_hist_entry *packet,
u64 nonloss_seqno);
-static inline void dccp_rx_hist_entry_delete(struct dccp_rx_hist *hist,
- struct dccp_rx_hist_entry *entry)
-{
- if (entry != NULL)
- kmem_cache_free(hist->dccprxh_slab, entry);
-}
-
-extern void dccp_rx_hist_purge(struct dccp_rx_hist *hist,
- struct list_head *list);
+extern void dccp_rx_hist_purge(struct list_head *list);
static inline int
dccp_rx_hist_entry_data_packet(const struct dccp_rx_hist_entry *entry)
--
1.5.3.4
--
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