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-rw-r--r--net/dccp/ccids/lib/loss_interval.c34
-rw-r--r--net/dccp/ccids/lib/loss_interval.h7
-rw-r--r--net/dccp/ccids/lib/packet_history.c141
-rw-r--r--net/dccp/ccids/lib/packet_history.h11
4 files changed, 32 insertions, 161 deletions
diff --git a/net/dccp/ccids/lib/loss_interval.c b/net/dccp/ccids/lib/loss_interval.c
index b93d9fc98cb8..906c81ab9d4f 100644
--- a/net/dccp/ccids/lib/loss_interval.c
+++ b/net/dccp/ccids/lib/loss_interval.c
@@ -12,6 +12,7 @@
*/
#include <linux/module.h>
+#include <net/sock.h>
#include "loss_interval.h"
@@ -90,13 +91,13 @@ u32 dccp_li_hist_calc_i_mean(struct list_head *list)
u32 w_tot = 0;
list_for_each_entry_safe(li_entry, li_next, list, dccplih_node) {
- if (i < DCCP_LI_HIST_IVAL_F_LENGTH) {
+ if (li_entry->dccplih_interval != ~0) {
i_tot0 += li_entry->dccplih_interval * dccp_li_hist_w[i];
w_tot += dccp_li_hist_w[i];
+ if (i != 0)
+ i_tot1 += li_entry->dccplih_interval * dccp_li_hist_w[i - 1];
}
- if (i != 0)
- i_tot1 += li_entry->dccplih_interval * dccp_li_hist_w[i - 1];
if (++i > DCCP_LI_HIST_IVAL_F_LENGTH)
break;
@@ -107,37 +108,36 @@ u32 dccp_li_hist_calc_i_mean(struct list_head *list)
i_tot = max(i_tot0, i_tot1);
- /* FIXME: Why do we do this? -Ian McDonald */
- if (i_tot * 4 < w_tot)
- i_tot = w_tot * 4;
+ if (!w_tot) {
+ LIMIT_NETDEBUG(KERN_WARNING "%s: w_tot = 0\n", __FUNCTION__);
+ return 1;
+ }
- return i_tot * 4 / w_tot;
+ return i_tot / w_tot;
}
EXPORT_SYMBOL_GPL(dccp_li_hist_calc_i_mean);
-struct dccp_li_hist_entry *dccp_li_hist_interval_new(struct dccp_li_hist *hist,
- struct list_head *list,
- const u64 seq_loss,
- const u8 win_loss)
+int dccp_li_hist_interval_new(struct dccp_li_hist *hist,
+ struct list_head *list, const u64 seq_loss, const u8 win_loss)
{
- struct dccp_li_hist_entry *tail = NULL, *entry;
+ struct dccp_li_hist_entry *entry;
int i;
- for (i = 0; i <= DCCP_LI_HIST_IVAL_F_LENGTH; ++i) {
+ for (i = 0; i < DCCP_LI_HIST_IVAL_F_LENGTH; i++) {
entry = dccp_li_hist_entry_new(hist, SLAB_ATOMIC);
if (entry == NULL) {
dccp_li_hist_purge(hist, list);
- return NULL;
+ dump_stack();
+ return 0;
}
- if (tail == NULL)
- tail = entry;
+ entry->dccplih_interval = ~0;
list_add(&entry->dccplih_node, list);
}
entry->dccplih_seqno = seq_loss;
entry->dccplih_win_count = win_loss;
- return tail;
+ return 1;
}
EXPORT_SYMBOL_GPL(dccp_li_hist_interval_new);
diff --git a/net/dccp/ccids/lib/loss_interval.h b/net/dccp/ccids/lib/loss_interval.h
index dcb370a53f57..0ae85f0340b2 100644
--- a/net/dccp/ccids/lib/loss_interval.h
+++ b/net/dccp/ccids/lib/loss_interval.h
@@ -52,9 +52,6 @@ extern void dccp_li_hist_purge(struct dccp_li_hist *hist,
extern u32 dccp_li_hist_calc_i_mean(struct list_head *list);
-extern struct dccp_li_hist_entry *
- dccp_li_hist_interval_new(struct dccp_li_hist *hist,
- struct list_head *list,
- const u64 seq_loss,
- const u8 win_loss);
+extern int dccp_li_hist_interval_new(struct dccp_li_hist *hist,
+ struct list_head *list, const u64 seq_loss, const u8 win_loss);
#endif /* _DCCP_LI_HIST_ */
diff --git a/net/dccp/ccids/lib/packet_history.c b/net/dccp/ccids/lib/packet_history.c
index 420c60f8604d..b876c9c81c65 100644
--- a/net/dccp/ccids/lib/packet_history.c
+++ b/net/dccp/ccids/lib/packet_history.c
@@ -112,64 +112,27 @@ struct dccp_rx_hist_entry *
EXPORT_SYMBOL_GPL(dccp_rx_hist_find_data_packet);
-int dccp_rx_hist_add_packet(struct dccp_rx_hist *hist,
+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)
+ struct dccp_rx_hist_entry *packet,
+ u64 nonloss_seqno)
{
- struct dccp_rx_hist_entry *entry, *next, *iter;
+ struct dccp_rx_hist_entry *entry, *next;
u8 num_later = 0;
- iter = dccp_rx_hist_head(rx_list);
- if (iter == NULL)
- dccp_rx_hist_add_entry(rx_list, packet);
- else {
- const u64 seqno = packet->dccphrx_seqno;
-
- if (after48(seqno, iter->dccphrx_seqno))
- dccp_rx_hist_add_entry(rx_list, packet);
- else {
- if (dccp_rx_hist_entry_data_packet(iter))
- num_later = 1;
-
- list_for_each_entry_continue(iter, rx_list,
- dccphrx_node) {
- if (after48(seqno, iter->dccphrx_seqno)) {
- dccp_rx_hist_add_entry(&iter->dccphrx_node,
- packet);
- goto trim_history;
- }
-
- if (dccp_rx_hist_entry_data_packet(iter))
- num_later++;
-
- if (num_later == TFRC_RECV_NUM_LATE_LOSS) {
- dccp_rx_hist_entry_delete(hist, packet);
- return 1;
- }
- }
-
- if (num_later < TFRC_RECV_NUM_LATE_LOSS)
- dccp_rx_hist_add_entry(rx_list, packet);
- /*
- * FIXME: else what? should we destroy the packet
- * like above?
- */
- }
- }
+ list_add(&packet->dccphrx_node, rx_list);
-trim_history:
- /*
- * Trim history (remove all packets after the NUM_LATE_LOSS + 1
- * data packets)
- */
num_later = TFRC_RECV_NUM_LATE_LOSS + 1;
if (!list_empty(li_list)) {
list_for_each_entry_safe(entry, next, rx_list, dccphrx_node) {
if (num_later == 0) {
- list_del_init(&entry->dccphrx_node);
- dccp_rx_hist_entry_delete(hist, entry);
+ if (after48(nonloss_seqno,
+ entry->dccphrx_seqno)) {
+ list_del_init(&entry->dccphrx_node);
+ dccp_rx_hist_entry_delete(hist, entry);
+ }
} else if (dccp_rx_hist_entry_data_packet(entry))
--num_later;
}
@@ -217,94 +180,10 @@ trim_history:
--num_later;
}
}
-
- return 0;
}
EXPORT_SYMBOL_GPL(dccp_rx_hist_add_packet);
-u64 dccp_rx_hist_detect_loss(struct list_head *rx_list,
- struct list_head *li_list, u8 *win_loss)
-{
- struct dccp_rx_hist_entry *entry, *next, *packet;
- struct dccp_rx_hist_entry *a_loss = NULL;
- struct dccp_rx_hist_entry *b_loss = NULL;
- u64 seq_loss = DCCP_MAX_SEQNO + 1;
- u8 num_later = TFRC_RECV_NUM_LATE_LOSS;
-
- list_for_each_entry_safe(entry, next, rx_list, dccphrx_node) {
- if (num_later == 0) {
- b_loss = entry;
- break;
- } else if (dccp_rx_hist_entry_data_packet(entry))
- --num_later;
- }
-
- if (b_loss == NULL)
- goto out;
-
- num_later = 1;
- list_for_each_entry_safe_continue(entry, next, rx_list, dccphrx_node) {
- if (num_later == 0) {
- a_loss = entry;
- break;
- } else if (dccp_rx_hist_entry_data_packet(entry))
- --num_later;
- }
-
- if (a_loss == NULL) {
- if (list_empty(li_list)) {
- /* no loss event have occured yet */
- LIMIT_NETDEBUG("%s: TODO: find a lost data packet by "
- "comparing to initial seqno\n",
- __FUNCTION__);
- goto out;
- } else {
- LIMIT_NETDEBUG("%s: Less than 4 data pkts in history!",
- __FUNCTION__);
- goto out;
- }
- }
-
- /* Locate a lost data packet */
- entry = packet = b_loss;
- list_for_each_entry_safe_continue(entry, next, rx_list, dccphrx_node) {
- u64 delta = dccp_delta_seqno(entry->dccphrx_seqno,
- packet->dccphrx_seqno);
-
- if (delta != 0) {
- if (dccp_rx_hist_entry_data_packet(packet))
- --delta;
- /*
- * FIXME: check this, probably this % usage is because
- * in earlier drafts the ndp count was just 8 bits
- * long, but now it cam be up to 24 bits long.
- */
-#if 0
- if (delta % DCCP_NDP_LIMIT !=
- (packet->dccphrx_ndp -
- entry->dccphrx_ndp) % DCCP_NDP_LIMIT)
-#endif
- if (delta != packet->dccphrx_ndp - entry->dccphrx_ndp) {
- seq_loss = entry->dccphrx_seqno;
- dccp_inc_seqno(&seq_loss);
- }
- }
- packet = entry;
- if (packet == a_loss)
- break;
- }
-out:
- if (seq_loss != DCCP_MAX_SEQNO + 1)
- *win_loss = a_loss->dccphrx_ccval;
- else
- *win_loss = 0; /* Paranoia */
-
- return seq_loss;
-}
-
-EXPORT_SYMBOL_GPL(dccp_rx_hist_detect_loss);
-
struct dccp_tx_hist *dccp_tx_hist_new(const char *name)
{
struct dccp_tx_hist *hist = kmalloc(sizeof(*hist), GFP_ATOMIC);
diff --git a/net/dccp/ccids/lib/packet_history.h b/net/dccp/ccids/lib/packet_history.h
index aea9c5d70910..067cf1c85a37 100644
--- a/net/dccp/ccids/lib/packet_history.h
+++ b/net/dccp/ccids/lib/packet_history.h
@@ -166,12 +166,6 @@ static inline void dccp_rx_hist_entry_delete(struct dccp_rx_hist *hist,
extern void dccp_rx_hist_purge(struct dccp_rx_hist *hist,
struct list_head *list);
-static inline void dccp_rx_hist_add_entry(struct list_head *list,
- struct dccp_rx_hist_entry *entry)
-{
- list_add(&entry->dccphrx_node, list);
-}
-
static inline struct dccp_rx_hist_entry *
dccp_rx_hist_head(struct list_head *list)
{
@@ -190,10 +184,11 @@ static inline int
entry->dccphrx_type == DCCP_PKT_DATAACK;
}
-extern int dccp_rx_hist_add_packet(struct dccp_rx_hist *hist,
+extern 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);
+ struct dccp_rx_hist_entry *packet,
+ u64 nonloss_seqno);
extern u64 dccp_rx_hist_detect_loss(struct list_head *rx_list,
struct list_head *li_list, u8 *win_loss);