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Date: Wed, 19 Dec 2007 14:25:45 +0000
From: Gerrit Renker <gerrit@....abdn.ac.uk>
To: acme@...hat.com
Cc: dccp@...r.kernel.org, netdev@...r.kernel.org,
Gerrit Renker <gerrit@....abdn.ac.uk>
Subject: [PATCH 04/14] [ACKVEC]: Inlines for run length and state
This provides inlines for Ack Vector run length and state, which allow to wrap
several instances of the same code into function calls.
The unused function dccp_ackvec_print() (which also relied on the older
constants), has been removed.
Signed-off-by: Gerrit Renker <gerrit@....abdn.ac.uk>
---
net/dccp/ackvec.c | 71 +++++++++++-------------------------------------
net/dccp/ackvec.h | 13 +++++++-
net/dccp/ccids/ccid2.c | 7 ++---
3 files changed, 30 insertions(+), 61 deletions(-)
--- a/net/dccp/ackvec.h
+++ b/net/dccp/ackvec.h
@@ -30,8 +30,17 @@
#define DCCP_ACKVEC_STATE_ECN_MARKED (1 << 6)
#define DCCP_ACKVEC_STATE_NOT_RECEIVED (3 << 6)
-#define DCCP_ACKVEC_STATE_MASK 0xC0 /* 11000000 */
-#define DCCP_ACKVEC_LEN_MASK 0x3F /* 00111111 */
+#define DCCPAV_MAX_RUNLEN 0x3F
+
+static inline u8 dccp_ackvec_runlen(const u8 *cell)
+{
+ return *cell & DCCPAV_MAX_RUNLEN;
+}
+
+static inline u8 dccp_ackvec_state(const u8 *cell)
+{
+ return *cell & ~DCCPAV_MAX_RUNLEN;
+}
/** struct dccp_ackvec - Ack Vector main data structure
*
--- a/net/dccp/ackvec.c
+++ b/net/dccp/ackvec.c
@@ -135,7 +135,7 @@ int dccp_insert_option_ackvec(struct sock *sk, struct sk_buff *skb)
avr->avr_ack_ptr = av->av_buf_head;
avr->avr_ack_ackno = av->av_buf_ackno;
avr->avr_ack_nonce = nonce;
- avr->avr_ack_runlen = av->av_buf[av->av_buf_head] & DCCP_ACKVEC_LEN_MASK;
+ avr->avr_ack_runlen = dccp_ackvec_runlen(av->av_buf + av->av_buf_head);
dccp_ackvec_insert_avr(av, avr);
@@ -178,18 +178,6 @@ void dccp_ackvec_free(struct dccp_ackvec *av)
kmem_cache_free(dccp_ackvec_slab, av);
}
-static inline u8 dccp_ackvec_state(const struct dccp_ackvec *av,
- const u32 index)
-{
- return av->av_buf[index] & DCCP_ACKVEC_STATE_MASK;
-}
-
-static inline u8 dccp_ackvec_len(const struct dccp_ackvec *av,
- const u32 index)
-{
- return av->av_buf[index] & DCCP_ACKVEC_LEN_MASK;
-}
-
/*
* If several packets are missing, the HC-Receiver may prefer to enter multiple
* bytes with run length 0, rather than a single byte with a larger run length;
@@ -234,6 +222,8 @@ static inline int dccp_ackvec_set_buf_head_state(struct dccp_ackvec *av,
int dccp_ackvec_add(struct dccp_ackvec *av, const struct sock *sk,
const u64 ackno, const u8 state)
{
+ u8 *cur_head = av->av_buf + av->av_buf_head,
+ *buf_end = av->av_buf + DCCPAV_MAX_ACKVEC_LEN;
/*
* Check at the right places if the buffer is full, if it is, tell the
* caller to start dropping packets till the HC-Sender acks our ACK
@@ -258,7 +248,7 @@ int dccp_ackvec_add(struct dccp_ackvec *av, const struct sock *sk,
/* See if this is the first ackno being inserted */
if (av->av_vec_len == 0) {
- av->av_buf[av->av_buf_head] = state;
+ *cur_head = state;
av->av_vec_len = 1;
} else if (after48(ackno, av->av_buf_ackno)) {
const u64 delta = dccp_delta_seqno(av->av_buf_ackno, ackno);
@@ -267,10 +257,9 @@ int dccp_ackvec_add(struct dccp_ackvec *av, const struct sock *sk,
* Look if the state of this packet is the same as the
* previous ackno and if so if we can bump the head len.
*/
- if (delta == 1 &&
- dccp_ackvec_state(av, av->av_buf_head) == state &&
- dccp_ackvec_len(av, av->av_buf_head) < DCCP_ACKVEC_LEN_MASK)
- av->av_buf[av->av_buf_head]++;
+ if (delta == 1 && dccp_ackvec_state(cur_head) == state &&
+ dccp_ackvec_runlen(cur_head) < DCCPAV_MAX_RUNLEN)
+ *cur_head += 1;
else if (dccp_ackvec_set_buf_head_state(av, delta, state))
return -ENOBUFS;
} else {
@@ -283,21 +272,18 @@ int dccp_ackvec_add(struct dccp_ackvec *av, const struct sock *sk,
* could reduce the complexity of this scan.)
*/
u64 delta = dccp_delta_seqno(ackno, av->av_buf_ackno);
- u32 index = av->av_buf_head;
while (1) {
- const u8 len = dccp_ackvec_len(av, index);
- const u8 state = dccp_ackvec_state(av, index);
+ const u8 len = dccp_ackvec_runlen(cur_head);
/*
* valid packets not yet in av_buf have a reserved
* entry, with a len equal to 0.
*/
- if (state == DCCP_ACKVEC_STATE_NOT_RECEIVED &&
- len == 0 && delta == 0) { /* Found our
- reserved seat! */
+ if (*cur_head == DCCP_ACKVEC_STATE_NOT_RECEIVED &&
+ delta == 0) {
dccp_pr_debug("Found %llu reserved seat!\n",
(unsigned long long)ackno);
- av->av_buf[index] = state;
+ *cur_head = state;
goto out;
}
/* len == 0 means one packet */
@@ -305,8 +291,8 @@ int dccp_ackvec_add(struct dccp_ackvec *av, const struct sock *sk,
goto out_duplicate;
delta -= len + 1;
- if (++index == DCCPAV_MAX_ACKVEC_LEN)
- index = 0;
+ if (++cur_head == buf_end)
+ cur_head = av->av_buf;
}
}
@@ -321,31 +307,6 @@ out_duplicate:
return -EILSEQ;
}
-#ifdef CONFIG_IP_DCCP_DEBUG
-void dccp_ackvector_print(const u64 ackno, const unsigned char *vector, int len)
-{
- dccp_pr_debug_cat("ACK vector len=%d, ackno=%llu |", len,
- (unsigned long long)ackno);
-
- while (len--) {
- const u8 state = (*vector & DCCP_ACKVEC_STATE_MASK) >> 6;
- const u8 rl = *vector & DCCP_ACKVEC_LEN_MASK;
-
- dccp_pr_debug_cat("%d,%d|", state, rl);
- ++vector;
- }
-
- dccp_pr_debug_cat("\n");
-}
-
-void dccp_ackvec_print(const struct dccp_ackvec *av)
-{
- dccp_ackvector_print(av->av_buf_ackno,
- av->av_buf + av->av_buf_head,
- av->av_vec_len);
-}
-#endif
-
static void dccp_ackvec_throw_record(struct dccp_ackvec *av,
struct dccp_ackvec_record *avr)
{
@@ -409,7 +370,7 @@ static void dccp_ackvec_check_rcv_ackvector(struct dccp_ackvec *av,
*/
avr = list_entry(av->av_records.next, struct dccp_ackvec_record, avr_node);
while (i--) {
- const u8 rl = *vector & DCCP_ACKVEC_LEN_MASK;
+ const u8 rl = dccp_ackvec_runlen(vector);
u64 ackno_end_rl;
dccp_set_seqno(&ackno_end_rl, *ackno - rl);
@@ -426,8 +387,8 @@ static void dccp_ackvec_check_rcv_ackvector(struct dccp_ackvec *av,
break;
found:
if (between48(avr->avr_ack_seqno, ackno_end_rl, *ackno)) {
- const u8 state = *vector & DCCP_ACKVEC_STATE_MASK;
- if (state != DCCP_ACKVEC_STATE_NOT_RECEIVED) {
+ if (dccp_ackvec_state(vector) !=
+ DCCP_ACKVEC_STATE_NOT_RECEIVED) {
dccp_pr_debug("%s ACK vector 0, len=%d, "
"ack_seqno=%llu, ack_ackno=%llu, "
"ACKED!\n",
--- a/net/dccp/ccids/ccid2.c
+++ b/net/dccp/ccids/ccid2.c
@@ -578,8 +578,8 @@ static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
&vector, &veclen)) != -1) {
/* go through this ack vector */
while (veclen--) {
- const u8 rl = *vector & DCCP_ACKVEC_LEN_MASK;
- u64 ackno_end_rl = SUB48(ackno, rl);
+ u64 ackno_end_rl = SUB48(ackno,
+ dccp_ackvec_runlen(vector));
ccid2_pr_debug("ackvec start:%llu end:%llu\n",
(unsigned long long)ackno,
@@ -602,8 +602,7 @@ static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
* run length
*/
while (between48(seqp->ccid2s_seq,ackno_end_rl,ackno)) {
- const u8 state = *vector &
- DCCP_ACKVEC_STATE_MASK;
+ const u8 state = dccp_ackvec_state(vector);
/* new packet received or marked */
if (state != DCCP_ACKVEC_STATE_NOT_RECEIVED &&
--
1.5.3.GIT
--
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