UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

[ACKVEC]: Reduce length of identifiers 

This is reduces the length of the struct ackvec/ackvec_record fields. It is
a purely text-based replacement:

	s#dccpavr_#avr_#g;
	s#dccpav_#av_#g;

and increases readability somewhat.

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Gerrit Renker 2007-12-30 04:19:31 -08:00 committed by David S. Miller
parent e7d0362dd4
commit a47c51044a
2 changed files with 108 additions and 117 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

163
net/dccp/ackvec.c
View File

@ -30,7 +30,7 @@ static struct dccp_ackvec_record *dccp_ackvec_record_new(void)
kmem_cache_alloc(dccp_ackvec_record_slab, GFP_ATOMIC);
if (avr != NULL)
INIT_LIST_HEAD(&avr->dccpavr_node);
INIT_LIST_HEAD(&avr->avr_node);
return avr;
}
@ -40,7 +40,7 @@ static void dccp_ackvec_record_delete(struct dccp_ackvec_record *avr)
if (unlikely(avr == NULL))
return;
/* Check if deleting a linked record */
WARN_ON(!list_empty(&avr->dccpavr_node));
WARN_ON(!list_empty(&avr->avr_node));
kmem_cache_free(dccp_ackvec_record_slab, avr);
}
@ -52,16 +52,15 @@ static void dccp_ackvec_insert_avr(struct dccp_ackvec *av,
* just add the AVR at the head of the list.
* -sorbo.
*/
if (!list_empty(&av->dccpav_records)) {
if (!list_empty(&av->av_records)) {
const struct dccp_ackvec_record *head =
list_entry(av->dccpav_records.next,
list_entry(av->av_records.next,
struct dccp_ackvec_record,
dccpavr_node);
BUG_ON(before48(avr->dccpavr_ack_seqno,
head->dccpavr_ack_seqno));
avr_node);
BUG_ON(before48(avr->avr_ack_seqno, head->avr_ack_seqno));
}
list_add(&avr->dccpavr_node, &av->dccpav_records);
list_add(&avr->avr_node, &av->av_records);
}
int dccp_insert_option_ackvec(struct sock *sk, struct sk_buff *skb)
@ -69,9 +68,8 @@ int dccp_insert_option_ackvec(struct sock *sk, struct sk_buff *skb)
struct dccp_sock *dp = dccp_sk(sk);
struct dccp_ackvec *av = dp->dccps_hc_rx_ackvec;
/* Figure out how many options do we need to represent the ackvec */
const u16 nr_opts = DIV_ROUND_UP(av->dccpav_vec_len,
DCCP_MAX_ACKVEC_OPT_LEN);
u16 len = av->dccpav_vec_len + 2 * nr_opts, i;
const u16 nr_opts = DIV_ROUND_UP(av->av_vec_len, DCCP_MAX_ACKVEC_OPT_LEN);
u16 len = av->av_vec_len + 2 * nr_opts, i;
u32 elapsed_time;
const unsigned char *tail, *from;
unsigned char *to;
@ -81,7 +79,7 @@ int dccp_insert_option_ackvec(struct sock *sk, struct sk_buff *skb)
if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN)
return -1;
delta = ktime_us_delta(ktime_get_real(), av->dccpav_time);
delta = ktime_us_delta(ktime_get_real(), av->av_time);
elapsed_time = delta / 10;
if (elapsed_time != 0 &&
@ -95,9 +93,9 @@ int dccp_insert_option_ackvec(struct sock *sk, struct sk_buff *skb)
DCCP_SKB_CB(skb)->dccpd_opt_len += len;
to = skb_push(skb, len);
len = av->dccpav_vec_len;
from = av->dccpav_buf + av->dccpav_buf_head;
tail = av->dccpav_buf + DCCP_MAX_ACKVEC_LEN;
len = av->av_vec_len;
from = av->av_buf + av->av_buf_head;
tail = av->av_buf + DCCP_MAX_ACKVEC_LEN;
for (i = 0; i < nr_opts; ++i) {
int copylen = len;
@ -116,7 +114,7 @@ int dccp_insert_option_ackvec(struct sock *sk, struct sk_buff *skb)
to += tailsize;
len -= tailsize;
copylen -= tailsize;
from = av->dccpav_buf;
from = av->av_buf;
}
memcpy(to, from, copylen);
@ -134,19 +132,19 @@ int dccp_insert_option_ackvec(struct sock *sk, struct sk_buff *skb)
* buf_head; ack_ackno will equal buf_ackno; and ack_nonce will
* equal buf_nonce.
*/
avr->dccpavr_ack_seqno = DCCP_SKB_CB(skb)->dccpd_seq;
avr->dccpavr_ack_ptr = av->dccpav_buf_head;
avr->dccpavr_ack_ackno = av->dccpav_buf_ackno;
avr->dccpavr_ack_nonce = av->dccpav_buf_nonce;
avr->dccpavr_sent_len = av->dccpav_vec_len;
avr->avr_ack_seqno = DCCP_SKB_CB(skb)->dccpd_seq;
avr->avr_ack_ptr = av->av_buf_head;
avr->avr_ack_ackno = av->av_buf_ackno;
avr->avr_ack_nonce = av->av_buf_nonce;
avr->avr_sent_len = av->av_vec_len;
dccp_ackvec_insert_avr(av, avr);
dccp_pr_debug("%s ACK Vector 0, len=%d, ack_seqno=%llu, "
"ack_ackno=%llu\n",
dccp_role(sk), avr->dccpavr_sent_len,
(unsigned long long)avr->dccpavr_ack_seqno,
(unsigned long long)avr->dccpavr_ack_ackno);
dccp_role(sk), avr->avr_sent_len,
(unsigned long long)avr->avr_ack_seqno,
(unsigned long long)avr->avr_ack_ackno);
return 0;
}
@ -155,12 +153,12 @@ struct dccp_ackvec *dccp_ackvec_alloc(const gfp_t priority)
struct dccp_ackvec *av = kmem_cache_alloc(dccp_ackvec_slab, priority);
if (av != NULL) {
av->dccpav_buf_head = DCCP_MAX_ACKVEC_LEN - 1;
av->dccpav_buf_ackno = UINT48_MAX + 1;
av->dccpav_buf_nonce = av->dccpav_buf_nonce = 0;
av->dccpav_time = ktime_set(0, 0);
av->dccpav_vec_len = 0;
INIT_LIST_HEAD(&av->dccpav_records);
av->av_buf_head = DCCP_MAX_ACKVEC_LEN - 1;
av->av_buf_ackno = UINT48_MAX + 1;
av->av_buf_nonce = 0;
av->av_time = ktime_set(0, 0);
av->av_vec_len = 0;
INIT_LIST_HEAD(&av->av_records);
}
return av;
@ -171,12 +169,11 @@ void dccp_ackvec_free(struct dccp_ackvec *av)
if (unlikely(av == NULL))
return;
if (!list_empty(&av->dccpav_records)) {
if (!list_empty(&av->av_records)) {
struct dccp_ackvec_record *avr, *next;
list_for_each_entry_safe(avr, next, &av->dccpav_records,
dccpavr_node) {
list_del_init(&avr->dccpavr_node);
list_for_each_entry_safe(avr, next, &av->av_records, avr_node) {
list_del_init(&avr->avr_node);
dccp_ackvec_record_delete(avr);
}
}
@ -187,13 +184,13 @@ void dccp_ackvec_free(struct dccp_ackvec *av)
static inline u8 dccp_ackvec_state(const struct dccp_ackvec *av,
const u32 index)
{
return av->dccpav_buf[index] & DCCP_ACKVEC_STATE_MASK;
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->dccpav_buf[index] & DCCP_ACKVEC_LEN_MASK;
return av->av_buf[index] & DCCP_ACKVEC_LEN_MASK;
}
/*
@ -208,29 +205,29 @@ static inline int dccp_ackvec_set_buf_head_state(struct dccp_ackvec *av,
unsigned int gap;
long new_head;
if (av->dccpav_vec_len + packets > DCCP_MAX_ACKVEC_LEN)
if (av->av_vec_len + packets > DCCP_MAX_ACKVEC_LEN)
return -ENOBUFS;
gap = packets - 1;
new_head = av->dccpav_buf_head - packets;
new_head = av->av_buf_head - packets;
if (new_head < 0) {
if (gap > 0) {
memset(av->dccpav_buf, DCCP_ACKVEC_STATE_NOT_RECEIVED,
memset(av->av_buf, DCCP_ACKVEC_STATE_NOT_RECEIVED,
gap + new_head + 1);
gap = -new_head;
}
new_head += DCCP_MAX_ACKVEC_LEN;
}
av->dccpav_buf_head = new_head;
av->av_buf_head = new_head;
if (gap > 0)
memset(av->dccpav_buf + av->dccpav_buf_head + 1,
memset(av->av_buf + av->av_buf_head + 1,
DCCP_ACKVEC_STATE_NOT_RECEIVED, gap);
av->dccpav_buf[av->dccpav_buf_head] = state;
av->dccpav_vec_len += packets;
av->av_buf[av->av_buf_head] = state;
av->av_vec_len += packets;
return 0;
}
@ -243,7 +240,7 @@ int dccp_ackvec_add(struct dccp_ackvec *av, const struct sock *sk,
/*
* 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
* vectors, when we will free up space in dccpav_buf.
* vectors, when we will free up space in av_buf.
*
* We may well decide to do buffer compression, etc, but for now lets
* just drop.
@ -263,22 +260,20 @@ int dccp_ackvec_add(struct dccp_ackvec *av, const struct sock *sk,
*/
/* See if this is the first ackno being inserted */
if (av->dccpav_vec_len == 0) {
av->dccpav_buf[av->dccpav_buf_head] = state;
av->dccpav_vec_len = 1;
} else if (after48(ackno, av->dccpav_buf_ackno)) {
const u64 delta = dccp_delta_seqno(av->dccpav_buf_ackno,
ackno);
if (av->av_vec_len == 0) {
av->av_buf[av->av_buf_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);
/*
* 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->dccpav_buf_head) == state &&
(dccp_ackvec_len(av, av->dccpav_buf_head) <
DCCP_ACKVEC_LEN_MASK))
av->dccpav_buf[av->dccpav_buf_head]++;
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]++;
else if (dccp_ackvec_set_buf_head_state(av, delta, state))
return -ENOBUFS;
} else {
@ -290,14 +285,14 @@ int dccp_ackvec_add(struct dccp_ackvec *av, const struct sock *sk,
* the byte corresponding to S. (Indexing structures
* could reduce the complexity of this scan.)
*/
u64 delta = dccp_delta_seqno(ackno, av->dccpav_buf_ackno);
u32 index = av->dccpav_buf_head;
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);
/*
* valid packets not yet in dccpav_buf have a reserved
* valid packets not yet in av_buf have a reserved
* entry, with a len equal to 0.
*/
if (state == DCCP_ACKVEC_STATE_NOT_RECEIVED &&
@ -305,7 +300,7 @@ int dccp_ackvec_add(struct dccp_ackvec *av, const struct sock *sk,
reserved seat! */
dccp_pr_debug("Found %llu reserved seat!\n",
(unsigned long long)ackno);
av->dccpav_buf[index] = state;
av->av_buf[index] = state;
goto out;
}
/* len == 0 means one packet */
@ -318,8 +313,8 @@ int dccp_ackvec_add(struct dccp_ackvec *av, const struct sock *sk,
}
}
av->dccpav_buf_ackno = ackno;
av->dccpav_time = ktime_get_real();
av->av_buf_ackno = ackno;
av->av_time = ktime_get_real();
out:
return 0;
@ -349,9 +344,9 @@ void dccp_ackvector_print(const u64 ackno, const unsigned char *vector, int len)
void dccp_ackvec_print(const struct dccp_ackvec *av)
{
dccp_ackvector_print(av->dccpav_buf_ackno,
av->dccpav_buf + av->dccpav_buf_head,
av->dccpav_vec_len);
dccp_ackvector_print(av->av_buf_ackno,
av->av_buf + av->av_buf_head,
av->av_vec_len);
}
#endif
@ -361,17 +356,15 @@ static void dccp_ackvec_throw_record(struct dccp_ackvec *av,
struct dccp_ackvec_record *next;
/* sort out vector length */
if (av->dccpav_buf_head <= avr->dccpavr_ack_ptr)
av->dccpav_vec_len = avr->dccpavr_ack_ptr - av->dccpav_buf_head;
if (av->av_buf_head <= avr->avr_ack_ptr)
av->av_vec_len = avr->avr_ack_ptr - av->av_buf_head;
else
av->dccpav_vec_len = DCCP_MAX_ACKVEC_LEN - 1
- av->dccpav_buf_head
+ avr->dccpavr_ack_ptr;
av->av_vec_len = DCCP_MAX_ACKVEC_LEN - 1 -
av->av_buf_head + avr->avr_ack_ptr;
/* free records */
list_for_each_entry_safe_from(avr, next, &av->dccpav_records,
dccpavr_node) {
list_del_init(&avr->dccpavr_node);
list_for_each_entry_safe_from(avr, next, &av->av_records, avr_node) {
list_del_init(&avr->avr_node);
dccp_ackvec_record_delete(avr);
}
}
@ -386,16 +379,16 @@ void dccp_ackvec_check_rcv_ackno(struct dccp_ackvec *av, struct sock *sk,
* windows. We will be receiving ACKs for stuff we sent a while back
* -sorbo.
*/
list_for_each_entry_reverse(avr, &av->dccpav_records, dccpavr_node) {
if (ackno == avr->dccpavr_ack_seqno) {
list_for_each_entry_reverse(avr, &av->av_records, avr_node) {
if (ackno == avr->avr_ack_seqno) {
dccp_pr_debug("%s ACK packet 0, len=%d, ack_seqno=%llu, "
"ack_ackno=%llu, ACKED!\n",
dccp_role(sk), 1,
(unsigned long long)avr->dccpavr_ack_seqno,
(unsigned long long)avr->dccpavr_ack_ackno);
(unsigned long long)avr->avr_ack_seqno,
(unsigned long long)avr->avr_ack_ackno);
dccp_ackvec_throw_record(av, avr);
break;
} else if (avr->dccpavr_ack_seqno > ackno)
} else if (avr->avr_ack_seqno > ackno)
break; /* old news */
}
}
@ -409,7 +402,7 @@ static void dccp_ackvec_check_rcv_ackvector(struct dccp_ackvec *av,
struct dccp_ackvec_record *avr;
/* Check if we actually sent an ACK vector */
if (list_empty(&av->dccpav_records))
if (list_empty(&av->av_records))
return;
i = len;
@ -418,8 +411,7 @@ static void dccp_ackvec_check_rcv_ackvector(struct dccp_ackvec *av,
* I think it might be more efficient to work backwards. See comment on
* rcv_ackno. -sorbo.
*/
avr = list_entry(av->dccpav_records.next, struct dccp_ackvec_record,
dccpavr_node);
avr = list_entry(av->av_records.next, struct dccp_ackvec_record, avr_node);
while (i--) {
const u8 rl = *vector & DCCP_ACKVEC_LEN_MASK;
u64 ackno_end_rl;
@ -430,15 +422,14 @@ static void dccp_ackvec_check_rcv_ackvector(struct dccp_ackvec *av,
* If our AVR sequence number is greater than the ack, go
* forward in the AVR list until it is not so.
*/
list_for_each_entry_from(avr, &av->dccpav_records,
dccpavr_node) {
if (!after48(avr->dccpavr_ack_seqno, *ackno))
list_for_each_entry_from(avr, &av->av_records, avr_node) {
if (!after48(avr->avr_ack_seqno, *ackno))
goto found;
}
/* End of the dccpav_records list, not found, exit */
/* End of the av_records list, not found, exit */
break;
found:
if (between48(avr->dccpavr_ack_seqno, ackno_end_rl, *ackno)) {
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) {
dccp_pr_debug("%s ACK vector 0, len=%d, "
@ -446,9 +437,9 @@ found:
"ACKED!\n",
dccp_role(sk), len,
(unsigned long long)
avr->dccpavr_ack_seqno,
avr->avr_ack_seqno,
(unsigned long long)
avr->dccpavr_ack_ackno);
avr->avr_ack_ackno);
dccp_ackvec_throw_record(av, avr);
break;
}

62
net/dccp/ackvec.h
View File

@ -32,54 +32,54 @@
*
* This data structure is the one defined in RFC 4340, Appendix A.
*
* @dccpav_buf_head - circular buffer head
* @dccpav_buf_tail - circular buffer tail
* @dccpav_buf_ackno - ack # of the most recent packet acknowledgeable in the
* buffer (i.e. %dccpav_buf_head)
* @dccpav_buf_nonce - the one-bit sum of the ECN Nonces on all packets acked
* @av_buf_head - circular buffer head
* @av_buf_tail - circular buffer tail
* @av_buf_ackno - ack # of the most recent packet acknowledgeable in the
* buffer (i.e. %av_buf_head)
* @av_buf_nonce - the one-bit sum of the ECN Nonces on all packets acked
* by the buffer with State 0
*
* Additionally, the HC-Receiver must keep some information about the
* Ack Vectors it has recently sent. For each packet sent carrying an
* Ack Vector, it remembers four variables:
*
* @dccpav_records - list of dccp_ackvec_record
* @dccpav_ack_nonce - the one-bit sum of the ECN Nonces for all State 0.
* @av_records - list of dccp_ackvec_record
* @av_ack_nonce - the one-bit sum of the ECN Nonces for all State 0.
*
* @dccpav_time - the time in usecs
* @dccpav_buf - circular buffer of acknowledgeable packets
* @av_time - the time in usecs
* @av_buf - circular buffer of acknowledgeable packets
*/
struct dccp_ackvec {
u64 dccpav_buf_ackno;
struct list_head dccpav_records;
ktime_t dccpav_time;
u16 dccpav_buf_head;
u16 dccpav_vec_len;
u8 dccpav_buf_nonce;
u8 dccpav_ack_nonce;
u8 dccpav_buf[DCCP_MAX_ACKVEC_LEN];
u64 av_buf_ackno;
struct list_head av_records;
ktime_t av_time;
u16 av_buf_head;
u16 av_vec_len;
u8 av_buf_nonce;
u8 av_ack_nonce;
u8 av_buf[DCCP_MAX_ACKVEC_LEN];
};
/** struct dccp_ackvec_record - ack vector record
*
* ACK vector record as defined in Appendix A of spec.
*
* The list is sorted by dccpavr_ack_seqno
* The list is sorted by avr_ack_seqno
*
* @dccpavr_node - node in dccpav_records
* @dccpavr_ack_seqno - sequence number of the packet this record was sent on
* @dccpavr_ack_ackno - sequence number being acknowledged
* @dccpavr_ack_ptr - pointer into dccpav_buf where this record starts
* @dccpavr_ack_nonce - dccpav_ack_nonce at the time this record was sent
* @dccpavr_sent_len - length of the record in dccpav_buf
* @avr_node - node in av_records
* @avr_ack_seqno - sequence number of the packet this record was sent on
* @avr_ack_ackno - sequence number being acknowledged
* @avr_ack_ptr - pointer into av_buf where this record starts
* @avr_ack_nonce - av_ack_nonce at the time this record was sent
* @avr_sent_len - lenght of the record in av_buf
*/
struct dccp_ackvec_record {
struct list_head dccpavr_node;
u64 dccpavr_ack_seqno;
u64 dccpavr_ack_ackno;
u16 dccpavr_ack_ptr;
u16 dccpavr_sent_len;
u8 dccpavr_ack_nonce;
struct list_head avr_node;
u64 avr_ack_seqno;
u64 avr_ack_ackno;
u16 avr_ack_ptr;
u16 avr_sent_len;
u8 avr_ack_nonce;
};
struct sock;
@ -105,7 +105,7 @@ extern int dccp_insert_option_ackvec(struct sock *sk, struct sk_buff *skb);
static inline int dccp_ackvec_pending(const struct dccp_ackvec *av)
{
return av->dccpav_vec_len;
return av->av_vec_len;
}
#else /* CONFIG_IP_DCCP_ACKVEC */
static inline int dccp_ackvec_init(void)