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@xxxxxxxxxxxxxx>
---
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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