This is a re-sent after discussion which
* changes the types to `unsigned int'
* removes the third argument of ccid_hc_tx_send_packet
since it is always set to skb->len
I double-checked this once, and compile-tested it.
Gerrit
----------------> Commit Message <-----------------------------------
[DCCP]: Use `unsigned' for packet lengths
This patch implements a suggestion by Ian McDonald and
1) Avoids tests against negative packet lengths by using unsigned int
for packet payload lengths in the CCID send_packet()/packet_sent() routines
2) As a consequence, it removes an now unnecessary test with regard to `len > 0'
in ccid3_hc_tx_packet_sent: that condition is always true, since
* negative packet lengths are avoided
* ccid3_hc_tx_send_packet flags an error whenever the payload length is 0.
As a consequence, ccid3_hc_tx_packet_sent is never called as all errors
returned by ccid_hc_tx_send_packet are caught in dccp_write_xmit
3) Removes the third argument of ccid_hc_tx_send_packet (the `len' parameter),
since it is currently always set to skb->len. The code is updated with regard
to this parameter change.
Signed-off-by: Gerrit Renker <gerrit@xxxxxxxxxxxxxx>
---
net/dccp/ccid.h | 14 ++++----
net/dccp/ccids/ccid2.c | 5 +-
net/dccp/ccids/ccid3.c | 83 ++++++++++++++++++++++---------------------------
net/dccp/output.c | 6 +--
4 files changed, 49 insertions(+), 59 deletions(-)
--- a/net/dccp/ccid.h
+++ b/net/dccp/ccid.h
@@ -51,10 +51,10 @@ struct ccid_operations {
unsigned char option,
unsigned char len, u16 idx,
unsigned char* value);
- int (*ccid_hc_tx_send_packet)(struct sock *sk,
- struct sk_buff *skb, int len);
- void (*ccid_hc_tx_packet_sent)(struct sock *sk, int more,
- int len);
+ int (*ccid_hc_tx_send_packet)(struct sock *sk,
+ struct sk_buff *skb);
+ void (*ccid_hc_tx_packet_sent)(struct sock *sk,
+ int more, unsigned int len);
void (*ccid_hc_rx_get_info)(struct sock *sk,
struct tcp_info *info);
void (*ccid_hc_tx_get_info)(struct sock *sk,
@@ -94,16 +94,16 @@ extern void ccid_hc_rx_delete(struct cci
extern void ccid_hc_tx_delete(struct ccid *ccid, struct sock *sk);
static inline int ccid_hc_tx_send_packet(struct ccid *ccid, struct sock *sk,
- struct sk_buff *skb, int len)
+ struct sk_buff *skb)
{
int rc = 0;
if (ccid->ccid_ops->ccid_hc_tx_send_packet != NULL)
- rc = ccid->ccid_ops->ccid_hc_tx_send_packet(sk, skb, len);
+ rc = ccid->ccid_ops->ccid_hc_tx_send_packet(sk, skb);
return rc;
}
static inline void ccid_hc_tx_packet_sent(struct ccid *ccid, struct sock *sk,
- int more, int len)
+ int more, unsigned int len)
{
if (ccid->ccid_ops->ccid_hc_tx_packet_sent != NULL)
ccid->ccid_ops->ccid_hc_tx_packet_sent(sk, more, len);
--- a/net/dccp/ccids/ccid2.c
+++ b/net/dccp/ccids/ccid2.c
@@ -125,8 +125,7 @@ static int ccid2_hc_tx_alloc_seq(struct
return 0;
}
-static int ccid2_hc_tx_send_packet(struct sock *sk,
- struct sk_buff *skb, int len)
+static int ccid2_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb)
{
struct ccid2_hc_tx_sock *hctx;
@@ -268,7 +267,7 @@ static void ccid2_start_rto_timer(struct
jiffies + hctx->ccid2hctx_rto);
}
-static void ccid2_hc_tx_packet_sent(struct sock *sk, int more, int len)
+static void ccid2_hc_tx_packet_sent(struct sock *sk, int more, unsigned int len)
{
struct dccp_sock *dp = dccp_sk(sk);
struct ccid2_hc_tx_sock *hctx = ccid2_hc_tx_sk(sk);
--- a/net/dccp/ccids/ccid3.c
+++ b/net/dccp/ccids/ccid3.c
@@ -273,8 +273,7 @@ out:
* = 0: can send immediately
* < 0: error condition; do not send packet
*/
-static int ccid3_hc_tx_send_packet(struct sock *sk,
- struct sk_buff *skb, int len)
+static int ccid3_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb)
{
struct dccp_sock *dp = dccp_sk(sk);
struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
@@ -289,7 +288,7 @@ static int ccid3_hc_tx_send_packet(struc
* zero-sized Data(Ack)s is theoretically possible, but for congestion
* control this case is pathological - ignore it.
*/
- if (unlikely(len == 0))
+ if (unlikely(skb->len == 0))
return -EBADMSG;
/* See if last packet allocated was not sent */
@@ -318,7 +317,7 @@ static int ccid3_hc_tx_send_packet(struc
ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK);
/* Set initial sending rate to 1 packet per second */
- ccid3_hc_tx_update_s(hctx, len);
+ ccid3_hc_tx_update_s(hctx, skb->len);
hctx->ccid3hctx_x = hctx->ccid3hctx_s;
/* First timeout, according to [RFC 3448, 4.2], is 1 second */
@@ -357,59 +356,53 @@ static int ccid3_hc_tx_send_packet(struc
return 0;
}
-static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, int len)
+static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, unsigned int len)
{
const struct dccp_sock *dp = dccp_sk(sk);
struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
struct timeval now;
+ unsigned long quarter_rtt;
+ struct dccp_tx_hist_entry *packet;
BUG_ON(hctx == NULL);
dccp_timestamp(sk, &now);
- /* check if we have sent a data packet */
- if (len > 0) {
- unsigned long quarter_rtt;
- struct dccp_tx_hist_entry *packet;
+ ccid3_hc_tx_update_s(hctx, len);
- ccid3_hc_tx_update_s(hctx, len);
+ packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist);
+ if (unlikely(packet == NULL)) {
+ DCCP_WARN("packet doesn't exist in history!\n");
+ return;
+ }
+ if (unlikely(packet->dccphtx_sent)) {
+ DCCP_WARN("no unsent packet in history!\n");
+ return;
+ }
+ packet->dccphtx_tstamp = now;
+ packet->dccphtx_seqno = dp->dccps_gss;
+ /*
+ * Check if win_count have changed
+ * Algorithm in "8.1. Window Counter Value" in RFC 4342.
+ */
+ quarter_rtt = timeval_delta(&now, &hctx->ccid3hctx_t_last_win_count);
+ if (likely(hctx->ccid3hctx_rtt > 8))
+ quarter_rtt /= hctx->ccid3hctx_rtt / 4;
- packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist);
- if (unlikely(packet == NULL)) {
- DCCP_WARN("packet doesn't exist in history!\n");
- return;
- }
- if (unlikely(packet->dccphtx_sent)) {
- DCCP_WARN("no unsent packet in history!\n");
- return;
- }
- packet->dccphtx_tstamp = now;
- packet->dccphtx_seqno = dp->dccps_gss;
- /*
- * Check if win_count have changed
- * Algorithm in "8.1. Window Counter Value" in RFC 4342.
- */
- quarter_rtt = timeval_delta(&now, &hctx->ccid3hctx_t_last_win_count);
- if (likely(hctx->ccid3hctx_rtt > 8))
- quarter_rtt /= hctx->ccid3hctx_rtt / 4;
-
- if (quarter_rtt > 0) {
- hctx->ccid3hctx_t_last_win_count = now;
- hctx->ccid3hctx_last_win_count = (hctx->ccid3hctx_last_win_count +
- min_t(unsigned long, quarter_rtt, 5)) % 16;
- ccid3_pr_debug("%s, sk=%p, window changed from "
- "%u to %u!\n",
- dccp_role(sk), sk,
- packet->dccphtx_ccval,
- hctx->ccid3hctx_last_win_count);
- }
+ if (quarter_rtt > 0) {
+ hctx->ccid3hctx_t_last_win_count = now;
+ hctx->ccid3hctx_last_win_count = (hctx->ccid3hctx_last_win_count +
+ min_t(unsigned long, quarter_rtt, 5)) % 16;
+ ccid3_pr_debug("%s, sk=%p, window changed from "
+ "%u to %u!\n",
+ dccp_role(sk), sk,
+ packet->dccphtx_ccval,
+ hctx->ccid3hctx_last_win_count);
+ }
- hctx->ccid3hctx_idle = 0;
- packet->dccphtx_rtt = hctx->ccid3hctx_rtt;
- packet->dccphtx_sent = 1;
- } else
- ccid3_pr_debug("%s, sk=%p, seqno=%llu NOT inserted!\n",
- dccp_role(sk), sk, dp->dccps_gss);
+ hctx->ccid3hctx_idle = 0;
+ packet->dccphtx_rtt = hctx->ccid3hctx_rtt;
+ packet->dccphtx_sent = 1;
}
static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
--- a/net/dccp/output.c
+++ b/net/dccp/output.c
@@ -195,8 +195,7 @@ static int dccp_wait_for_ccid(struct soc
if (signal_pending(current))
goto do_interrupted;
- rc = ccid_hc_tx_send_packet(dp->dccps_hc_tx_ccid, sk, skb,
- skb->len);
+ rc = ccid_hc_tx_send_packet(dp->dccps_hc_tx_ccid, sk, skb);
if (rc <= 0)
break;
delay = msecs_to_jiffies(rc);
@@ -245,8 +244,7 @@ void dccp_write_xmit(struct sock *sk, in
this we have other issues */
while ((skb = skb_peek(&sk->sk_write_queue))) {
- int err = ccid_hc_tx_send_packet(dp->dccps_hc_tx_ccid, sk, skb,
- skb->len);
+ int err = ccid_hc_tx_send_packet(dp->dccps_hc_tx_ccid, sk, skb);
if (err > 0) {
if (!block) {
-
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