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| author |   Arnaldo Carvalho de Melo <acme@redhat.com> | 2007-11-29 22:47:15 -0200 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2008-01-28 14:55:19 -0800 |
| commit | 9108d5f4b2cd82f55ad178caa0be66a866a06dcc (patch) | |
| tree | c706ab8146fa93ab56c72037b7daa2a6f78e4062 /net/dccp/ccids/lib/packet_history.c | |
| parent | [NET]: Implement the per network namespace sysctl infrastructure (diff) | |
| download | linux-dev-9108d5f4b2cd82f55ad178caa0be66a866a06dcc.tar.xz linux-dev-9108d5f4b2cd82f55ad178caa0be66a866a06dcc.zip | |
[TFRC]: Hide tx history details from the CCIDs
Based on a previous patch by Gerrit Renker.
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/dccp/ccids/lib/packet_history.c')
| -rw-r--r-- | net/dccp/ccids/lib/packet_history.c | 33 |
1 files changed, 31 insertions, 2 deletions
diff --git a/net/dccp/ccids/lib/packet_history.c b/net/dccp/ccids/lib/packet_history.c index 139736064713..4805de996568 100644 --- a/net/dccp/ccids/lib/packet_history.c +++ b/net/dccp/ccids/lib/packet_history.c @@ -39,12 +39,24 @@ #include <linux/string.h> #include "packet_history.h" +/** + * tfrc_tx_hist_entry - Simple singly-linked TX history list + * @next: next oldest entry (LIFO order) + * @seqno: sequence number of this entry + * @stamp: send time of packet with sequence number @seqno + */ +struct tfrc_tx_hist_entry { + struct tfrc_tx_hist_entry *next; + u64 seqno; + ktime_t stamp; +}; + /* * Transmitter History Routines */ static struct kmem_cache *tfrc_tx_hist; -struct tfrc_tx_hist_entry * +static struct tfrc_tx_hist_entry * tfrc_tx_hist_find_entry(struct tfrc_tx_hist_entry *head, u64 seqno) { while (head != NULL && head->seqno != seqno) @@ -52,7 +64,6 @@ struct tfrc_tx_hist_entry * return head; } -EXPORT_SYMBOL_GPL(tfrc_tx_hist_find_entry); int tfrc_tx_hist_add(struct tfrc_tx_hist_entry **headp, u64 seqno) { @@ -83,6 +94,24 @@ void tfrc_tx_hist_purge(struct tfrc_tx_hist_entry **headp) } EXPORT_SYMBOL_GPL(tfrc_tx_hist_purge); +u32 tfrc_tx_hist_rtt(struct tfrc_tx_hist_entry *head, const u64 seqno, + const ktime_t now) +{ + u32 rtt = 0; + struct tfrc_tx_hist_entry *packet = tfrc_tx_hist_find_entry(head, seqno); + + if (packet != NULL) { + rtt = ktime_us_delta(now, packet->stamp); + /* + * Garbage-collect older (irrelevant) entries: + */ + tfrc_tx_hist_purge(&packet->next); + } + + return rtt; +} +EXPORT_SYMBOL_GPL(tfrc_tx_hist_rtt); + /* * Receiver History Routines */ |