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Date: Tue, 13 Oct 2009 14:23:28 -0300
From: Ivo Calado <ivocalado@...edded.ufcg.edu.br>
To: dccp@...r.kernel.org
CC: netdev@...r.kernel.org, ivocalado@...edded.ufcg.edu.br
Subject: [PATCH 1/4] Adds random ect generation to tfrc-sp sender side
Adds random ect generation to tfrc-sp sender side. Before sending the packet, TFRC-SP chooses randomly
one ect codepoint, returns it and register at the ect history list.
Changes:
- Creates tfrc_sp_get_random_ect, that uses random.h to choose one ect codepoint
- Defines tfrc_tx_li_data, that stores data parsed from options loss intervals and dropped packets, and ecn nonce history
- Defines tfrc_ecn_echo_sum_entry, type of entries of ecn nonce history list
- Adds memory manage routines and code to these structures
Signed-off-by: Ivo Calado <ivocalado@...edded.ufcg.edu.br>
Signed-off-by: Erivaldo Xavier <desadoc@...il.com>
Signed-off-by: Leandro Sales <leandroal@...il.com>
Index: dccp_tree_work03/net/dccp/ccids/lib/loss_interval_sp.c
===================================================================
--- dccp_tree_work03.orig/net/dccp/ccids/lib/loss_interval_sp.c 2009-10-08 22:59:20.526408512 -0300
+++ dccp_tree_work03/net/dccp/ccids/lib/loss_interval_sp.c 2009-10-08 22:59:26.926501680 -0300
@@ -15,6 +15,7 @@
static struct kmem_cache *tfrc_lh_slab __read_mostly;
static struct kmem_cache *tfrc_ld_slab __read_mostly;
+static struct kmem_cache *tfrc_ecn_echo_sum_slab __read_mostly;
/* Loss Interval weights from [RFC 3448, 5.4], scaled by 10 */
static const int tfrc_lh_weights[NINTERVAL] = { 10, 10, 10, 10, 8, 6, 4, 2 };
@@ -84,6 +85,48 @@
}
/*
+ * tfrc_sp_get_random_ect - return random ect codepoint
+ * li_data: data where to register ect sent
+ * seqn: packet's sequence number
+ */
+int tfrc_sp_get_random_ect(struct tfrc_tx_li_data *li_data, u64 seqn)
+{
+ int ect;
+ struct tfrc_ecn_echo_sum_entry *sum;
+
+ /* TODO: implement random ect*/
+ ect = INET_ECN_ECT_0;
+
+ sum = kmem_cache_alloc(tfrc_ecn_echo_sum_slab, GFP_ATOMIC);
+
+ sum->previous = li_data->ecn_sums_head;
+ sum->ecn_echo_sum = (sum->previous->ecn_echo_sum) ? !ect : ect;
+ sum->seq_num = seqn;
+
+ li_data->ecn_sums_head = sum;
+
+ return ect;
+}
+
+/*
+ * tfrc_sp_tx_ld_cleanup - free all entries
+ * echo_sums_data: head of the list
+ */
+void tfrc_sp_tx_ld_cleanup(struct tfrc_ecn_echo_sum_entry **echo_sums_data)
+{
+ struct tfrc_ecn_echo_sum_entry *e, *previous;
+ e = *echo_sums_data;
+
+ while (e != NULL) {
+ previous = e->previous;
+ kmem_cache_free(tfrc_ecn_echo_sum_slab, e);
+ e = previous;
+ }
+
+ *echo_sums_data = NULL;
+}
+
+/*
* Allocation routine for new entries of loss interval data
*/
static struct tfrc_loss_data_entry *tfrc_ld_add_new(struct tfrc_loss_data *ld)
@@ -493,8 +536,13 @@
tfrc_ld_slab = kmem_cache_create("tfrc_sp_li_data",
sizeof(struct tfrc_loss_data_entry), 0,
SLAB_HWCACHE_ALIGN, NULL);
-
- if ((tfrc_lh_slab != NULL) && (tfrc_ld_slab != NULL))
+ tfrc_ecn_echo_sum_slab = kmem_cache_create("tfrc_sp_ecn_echo_sum",
+ sizeof(struct tfrc_ecn_echo_sum_entry), 0,
+ SLAB_HWCACHE_ALIGN, NULL);
+
+ if ((tfrc_lh_slab != NULL) &&
+ (tfrc_ld_slab != NULL) &&
+ (tfrc_ecn_echo_sum_slab != NULL))
return 0;
if (tfrc_lh_slab != NULL) {
@@ -507,6 +555,11 @@
tfrc_ld_slab = NULL;
}
+ if (tfrc_ecn_echo_sum_slab != NULL) {
+ kmem_cache_destroy(tfrc_ecn_echo_sum_slab);
+ tfrc_ecn_echo_sum_slab = NULL;
+ }
+
return -ENOBUFS;
}
@@ -521,4 +574,9 @@
kmem_cache_destroy(tfrc_ld_slab);
tfrc_ld_slab = NULL;
}
+
+ if (tfrc_ecn_echo_sum_slab != NULL) {
+ kmem_cache_destroy(tfrc_ecn_echo_sum_slab);
+ tfrc_ecn_echo_sum_slab = NULL;
+ }
}
Index: dccp_tree_work03/net/dccp/ccids/lib/loss_interval_sp.h
===================================================================
--- dccp_tree_work03.orig/net/dccp/ccids/lib/loss_interval_sp.h 2009-10-08 22:59:20.526408512 -0300
+++ dccp_tree_work03/net/dccp/ccids/lib/loss_interval_sp.h 2009-10-08 22:59:26.926501680 -0300
@@ -128,6 +128,31 @@
memset(ld, 0, sizeof(*ld));
}
+/*
+ * tfrc_ecn_echo_sum_entry - store sent ecn codepoint info
+ * ecn_echo_sum: ecn echo sum up to that packet
+ * seq_num: sequence number of packet
+ * previous: previous sent packet info
+ */
+struct tfrc_ecn_echo_sum_entry {
+ u8 ecn_echo_sum:1;
+ u64 seq_num:48;
+ struct tfrc_ecn_echo_sum_entry *previous;
+};
+
+/*
+ * tfrc_tx_li_data - data about sent ecn and parsed options
+ * ecn_sums_head: ecn data list
+ * seq_num: sequence number of packet
+ * previous: previous sent packet info
+ */
+struct tfrc_tx_li_data {
+ struct tfrc_ecn_echo_sum_entry *ecn_sums_head;
+ u32 dropped_packets_data[1 + 9];
+ u32 loss_interval_data[1 + 9];
+ u8 skip_length;
+};
+
struct tfrc_rx_hist;
extern bool tfrc_sp_lh_interval_add(struct tfrc_loss_hist *,
@@ -143,6 +168,8 @@
extern void tfrc_sp_lh_cleanup(struct tfrc_loss_hist *lh);
extern void tfrc_sp_ld_cleanup(struct tfrc_loss_data *ld);
extern void tfrc_sp_ld_prepare_data(u8 loss_count, struct tfrc_loss_data *ld);
+extern int tfrc_sp_get_random_ect(struct tfrc_tx_li_data *li_data, u64 seqn);
+extern void tfrc_sp_tx_ld_cleanup(struct tfrc_ecn_echo_sum_entry **);
#endif /* _DCCP_LI_HIST_SP_ */
Index: dccp_tree_work03/net/dccp/ccids/lib/tfrc_ccids_sp.h
===================================================================
--- dccp_tree_work03.orig/net/dccp/ccids/lib/tfrc_ccids_sp.h 2009-10-08 22:59:20.526408512 -0300
+++ dccp_tree_work03/net/dccp/ccids/lib/tfrc_ccids_sp.h 2009-10-08 22:59:26.926501680 -0300
@@ -85,6 +85,7 @@
ktime_t t_ld;
ktime_t t_nom;
struct tfrc_tx_hist_entry *hist;
+ struct tfrc_tx_li_data li_data;
};
static inline struct tfrc_hc_tx_sock *tfrc_hc_tx_sk(const struct sock *sk)
--
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