[DCCP]: Simplified conditions due to use of enum:8 states
This reaps the benefit of the earlier patch, which changed the type of
CCID 3 states to use enums, in that many conditions are now simplified
and the number of possible (unexpected) values is greatly reduced.
In a few instances, this also allowed to simplify pre-conditions; where
care has been taken to retain logical equivalence.
[DCCP]: Introduce a consistent BUG/WARN message scheme
This refines the existing set of DCCP messages so that
* BUG(), BUG_ON(), WARN_ON() have meaningful DCCP-specific counterparts
* DCCP_CRIT (for severe warnings) is not rate-limited
* DCCP_WARN() is introduced as rate-limited wrapper
Using these allows a faster and cleaner transition to their original
counterparts once the code has matured into a full DCCP implementation.
Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
diff --git a/net/dccp/ccids/ccid2.c b/net/dccp/ccids/ccid2.c
index 0fb0d66..207f7f9 100644
--- a/net/dccp/ccids/ccid2.c
+++ b/net/dccp/ccids/ccid2.c
@@ -420,7 +420,7 @@
return -1;
out_invalid_option:
- BUG_ON(1); /* should never happen... options were previously parsed ! */
+ DCCP_BUG("Invalid option - this should not happen (previous parsing)!");
return -1;
}
diff --git a/net/dccp/ccids/ccid3.c b/net/dccp/ccids/ccid3.c
index 7db801e..4eada51 100644
--- a/net/dccp/ccids/ccid3.c
+++ b/net/dccp/ccids/ccid3.c
@@ -176,8 +176,6 @@
ccid3_tx_state_name(hctx->ccid3hctx_state));
switch (hctx->ccid3hctx_state) {
- case TFRC_SSTATE_TERM:
- goto out;
case TFRC_SSTATE_NO_FBACK:
/* Halve send rate */
hctx->ccid3hctx_x /= 2;
@@ -240,9 +238,10 @@
2 * usecs_div(hctx->ccid3hctx_s,
hctx->ccid3hctx_x));
break;
- default:
- DCCP_BUG("%s, sk=%p, Illegal state (%d)!", dccp_role(sk), sk,
- hctx->ccid3hctx_state);
+ case TFRC_SSTATE_NO_SENT:
+ DCCP_BUG("Illegal %s state NO_SENT, sk=%p", dccp_role(sk), sk);
+ /* fall through */
+ case TFRC_SSTATE_TERM:
goto out;
}
@@ -264,7 +263,7 @@
long delay;
int rc = -ENOTCONN;
- BUG_ON(hctx == NULL || hctx->ccid3hctx_state == TFRC_SSTATE_TERM);
+ BUG_ON(hctx == NULL);
/* Check if pure ACK or Terminating*/
/*
@@ -282,9 +281,8 @@
rc = -ENOBUFS;
if (unlikely(new_packet == NULL)) {
- LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, not enough "
- "mem to add to history, send refused\n",
- __FUNCTION__, dccp_role(sk), sk);
+ DCCP_WARN("%s, sk=%p, not enough mem to add to history,"
+ "send refused\n", dccp_role(sk), sk);
goto out;
}
@@ -317,9 +315,8 @@
/* divide by -1000 is to convert to ms and get sign right */
rc = delay > 0 ? delay : 0;
break;
- default:
- DCCP_BUG("%s, sk=%p, Illegal state (%d)!", dccp_role(sk), sk,
- hctx->ccid3hctx_state);
+ case TFRC_SSTATE_TERM:
+ DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk);
rc = -EINVAL;
break;
}
@@ -343,7 +340,7 @@
struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
struct timeval now;
- BUG_ON(hctx == NULL || hctx->ccid3hctx_state == TFRC_SSTATE_TERM);
+ BUG_ON(hctx == NULL);
dccp_timestamp(sk, &now);
@@ -354,13 +351,11 @@
packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist);
if (unlikely(packet == NULL)) {
- LIMIT_NETDEBUG(KERN_WARNING "%s: packet doesn't "
- "exists in history!\n", __FUNCTION__);
+ DCCP_WARN("packet doesn't exist in history!\n");
return;
}
if (unlikely(packet->dccphtx_sent)) {
- LIMIT_NETDEBUG(KERN_WARNING "%s: no unsent packet in "
- "history!\n", __FUNCTION__);
+ DCCP_WARN("no unsent packet in history!\n");
return;
}
packet->dccphtx_tstamp = now;
@@ -395,9 +390,8 @@
case TFRC_SSTATE_NO_SENT:
/* if first wasn't pure ack */
if (len != 0)
- printk(KERN_CRIT "%s: %s, First packet sent is noted "
- "as a data packet\n",
- __FUNCTION__, dccp_role(sk));
+ DCCP_CRIT("%s, First packet sent is noted "
+ "as a data packet", dccp_role(sk));
return;
case TFRC_SSTATE_NO_FBACK:
case TFRC_SSTATE_FBACK:
@@ -410,9 +404,8 @@
hctx->ccid3hctx_t_ipi);
}
break;
- default:
- DCCP_BUG("%s, sk=%p, Illegal state (%d)!", dccp_role(sk), sk,
- hctx->ccid3hctx_state);
+ case TFRC_SSTATE_TERM:
+ DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk);
break;
}
}
@@ -430,7 +423,7 @@
u32 x_recv;
u32 r_sample;
- BUG_ON(hctx == NULL || hctx->ccid3hctx_state == TFRC_SSTATE_TERM);
+ BUG_ON(hctx == NULL);
/* we are only interested in ACKs */
if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK ||
@@ -455,11 +448,10 @@
packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist,
DCCP_SKB_CB(skb)->dccpd_ack_seq);
if (unlikely(packet == NULL)) {
- LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, seqno "
- "%llu(%s) does't exist in history!\n",
- __FUNCTION__, dccp_role(sk), sk,
+ DCCP_WARN("%s, sk=%p, seqno %llu(%s) does't exist "
+ "in history!\n", dccp_role(sk), sk,
(unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq,
- dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type));
+ dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type));
return;
}
@@ -467,9 +459,8 @@
dccp_timestamp(sk, &now);
r_sample = timeval_delta(&now, &packet->dccphtx_tstamp);
if (unlikely(r_sample <= t_elapsed))
- LIMIT_NETDEBUG(KERN_WARNING "%s: r_sample=%uus, "
- "t_elapsed=%uus\n",
- __FUNCTION__, r_sample, t_elapsed);
+ DCCP_WARN("r_sample=%uus,t_elapsed=%uus\n",
+ r_sample, t_elapsed);
else
r_sample -= t_elapsed;
@@ -554,9 +545,8 @@
/* set idle flag */
hctx->ccid3hctx_idle = 1;
break;
- default:
- DCCP_BUG("%s, sk=%p, Illegal state (%d)!", dccp_role(sk), sk,
- hctx->ccid3hctx_state);
+ case TFRC_SSTATE_TERM:
+ DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk);
break;
}
}
@@ -596,9 +586,9 @@
switch (option) {
case TFRC_OPT_LOSS_EVENT_RATE:
if (unlikely(len != 4)) {
- LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, invalid "
- "len for TFRC_OPT_LOSS_EVENT_RATE\n",
- __FUNCTION__, dccp_role(sk), sk);
+ DCCP_WARN("%s, sk=%p, invalid len %d "
+ "for TFRC_OPT_LOSS_EVENT_RATE\n",
+ dccp_role(sk), sk, len);
rc = -EINVAL;
} else {
opt_recv->ccid3or_loss_event_rate = ntohl(*(__be32 *)value);
@@ -617,9 +607,9 @@
break;
case TFRC_OPT_RECEIVE_RATE:
if (unlikely(len != 4)) {
- LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, invalid "
- "len for TFRC_OPT_RECEIVE_RATE\n",
- __FUNCTION__, dccp_role(sk), sk);
+ DCCP_WARN("%s, sk=%p, invalid len %d "
+ "for TFRC_OPT_RECEIVE_RATE\n",
+ dccp_role(sk), sk, len);
rc = -EINVAL;
} else {
opt_recv->ccid3or_receive_rate = ntohl(*(__be32 *)value);
@@ -722,17 +712,15 @@
delta);
}
break;
- default:
- DCCP_BUG("%s, sk=%p, Illegal state (%d)!", dccp_role(sk), sk,
- hcrx->ccid3hcrx_state);
+ case TFRC_RSTATE_TERM:
+ DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk);
return;
}
packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist);
if (unlikely(packet == NULL)) {
- LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, no data packet "
- "in history!\n",
- __FUNCTION__, dccp_role(sk), sk);
+ DCCP_WARN("%s, sk=%p, no data packet in history!\n",
+ dccp_role(sk), sk);
return;
}
@@ -820,29 +808,29 @@
}
if (unlikely(step == 0)) {
- LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, packet history "
- "contains no data packets!\n",
- __FUNCTION__, dccp_role(sk), sk);
+ DCCP_WARN("%s, sk=%p, packet history has no data packets!\n",
+ dccp_role(sk), sk);
return ~0;
}
if (unlikely(interval == 0)) {
- LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, Could not find a "
- "win_count interval > 0. Defaulting to 1\n",
- __FUNCTION__, dccp_role(sk), sk);
+ DCCP_WARN("%s, sk=%p, Could not find a win_count interval > 0."
+ "Defaulting to 1\n", dccp_role(sk), sk);
interval = 1;
}
found:
if (!tail) {
- LIMIT_NETDEBUG(KERN_WARNING "%s: tail is null\n",
- __FUNCTION__);
+ DCCP_CRIT("tail is null\n");
return ~0;
}
rtt = timeval_delta(&tstamp, &tail->dccphrx_tstamp) * 4 / interval;
ccid3_pr_debug("%s, sk=%p, approximated RTT to %uus\n",
dccp_role(sk), sk, rtt);
- if (rtt == 0)
- rtt = 1;
+
+ if (rtt == 0) {
+ DCCP_WARN("RTT==0, setting to 1\n");
+ rtt = 1;
+ }
dccp_timestamp(sk, &tstamp);
delta = timeval_delta(&tstamp, &hcrx->ccid3hcrx_tstamp_last_feedback);
@@ -856,9 +844,7 @@
tmp2 = (u32)tmp1;
if (!tmp2) {
- LIMIT_NETDEBUG(KERN_WARNING "tmp2 = 0 "
- "%s: x_recv = %u, rtt =%u\n",
- __FUNCTION__, x_recv, rtt);
+ DCCP_CRIT("tmp2 = 0, x_recv = %u, rtt =%u\n", x_recv, rtt);
return ~0;
}
@@ -904,8 +890,7 @@
entry = dccp_li_hist_entry_new(ccid3_li_hist, SLAB_ATOMIC);
if (entry == NULL) {
- printk(KERN_CRIT "%s: out of memory\n",__FUNCTION__);
- dump_stack();
+ DCCP_BUG("out of memory - can not allocate entry");
return;
}
@@ -984,9 +969,7 @@
u32 p_prev, rtt_prev, r_sample, t_elapsed;
int loss;
- BUG_ON(hcrx == NULL ||
- !(hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA ||
- hcrx->ccid3hcrx_state == TFRC_RSTATE_DATA));
+ BUG_ON(hcrx == NULL);
opt_recv = &dccp_sk(sk)->dccps_options_received;
@@ -1004,9 +987,8 @@
t_elapsed = opt_recv->dccpor_elapsed_time * 10;
if (unlikely(r_sample <= t_elapsed))
- LIMIT_NETDEBUG(KERN_WARNING "%s: r_sample=%uus, "
- "t_elapsed=%uus\n",
- __FUNCTION__, r_sample, t_elapsed);
+ DCCP_WARN("r_sample=%uus, t_elapsed=%uus\n",
+ r_sample, t_elapsed);
else
r_sample -= t_elapsed;
@@ -1030,9 +1012,8 @@
packet = dccp_rx_hist_entry_new(ccid3_rx_hist, sk, opt_recv->dccpor_ndp,
skb, SLAB_ATOMIC);
if (unlikely(packet == NULL)) {
- LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, Not enough mem to "
- "add rx packet to history, consider it lost!\n",
- __FUNCTION__, dccp_role(sk), sk);
+ DCCP_WARN("%s, sk=%p, Not enough mem to add rx packet "
+ "to history, consider it lost!\n", dccp_role(sk), sk);
return;
}
@@ -1065,9 +1046,8 @@
ccid3_hc_rx_send_feedback(sk);
}
return;
- default:
- DCCP_BUG("%s, sk=%p, Illegal state (%d)!", dccp_role(sk), sk,
- hcrx->ccid3hcrx_state);
+ case TFRC_RSTATE_TERM:
+ DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk);
return;
}
@@ -1084,10 +1064,8 @@
/* Scaling up by 1000000 as fixed decimal */
if (i_mean != 0)
hcrx->ccid3hcrx_p = 1000000 / i_mean;
- } else {
- printk(KERN_CRIT "%s: empty loss hist\n",__FUNCTION__);
- dump_stack();
- }
+ } else
+ DCCP_BUG("empty loss history");
if (hcrx->ccid3hcrx_p > p_prev) {
ccid3_hc_rx_send_feedback(sk);
diff --git a/net/dccp/ccids/lib/loss_interval.c b/net/dccp/ccids/lib/loss_interval.c
index 906c81a..48b9b93 100644
--- a/net/dccp/ccids/lib/loss_interval.c
+++ b/net/dccp/ccids/lib/loss_interval.c
@@ -13,7 +13,7 @@
#include <linux/module.h>
#include <net/sock.h>
-
+#include "../../dccp.h"
#include "loss_interval.h"
struct dccp_li_hist *dccp_li_hist_new(const char *name)
@@ -109,7 +109,7 @@
i_tot = max(i_tot0, i_tot1);
if (!w_tot) {
- LIMIT_NETDEBUG(KERN_WARNING "%s: w_tot = 0\n", __FUNCTION__);
+ DCCP_WARN("w_tot = 0\n");
return 1;
}
@@ -128,7 +128,7 @@
entry = dccp_li_hist_entry_new(hist, SLAB_ATOMIC);
if (entry == NULL) {
dccp_li_hist_purge(hist, list);
- dump_stack();
+ DCCP_BUG("loss interval list entry is NULL");
return 0;
}
entry->dccplih_interval = ~0;
diff --git a/net/dccp/ccids/lib/tfrc_equation.c b/net/dccp/ccids/lib/tfrc_equation.c
index 44076e0..2601012 100644
--- a/net/dccp/ccids/lib/tfrc_equation.c
+++ b/net/dccp/ccids/lib/tfrc_equation.c
@@ -13,9 +13,8 @@
*/
#include <linux/module.h>
-
#include <asm/div64.h>
-
+#include "../../dccp.h"
#include "tfrc.h"
#define TFRC_CALC_X_ARRSIZE 500
@@ -588,8 +587,10 @@
/* p should be 0 unless there is a bug in my code */
index = 0;
- if (R == 0)
+ if (R == 0) {
+ DCCP_WARN("RTT==0, setting to 1\n");
R = 1; /* RTT can't be zero or else divide by zero */
+ }
BUG_ON(index >= TFRC_CALC_X_ARRSIZE);