/*
* net/dccp/ackvec.c
*
- * An implementation of Ack Vectors for the DCCP protocol
- * Copyright (c) 2007 University of Aberdeen, Scotland, UK
+ * An implementation of the DCCP protocol
* Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
*
* This program is free software; you can redistribute it and/or modify it
static struct kmem_cache *dccp_ackvec_slab;
static struct kmem_cache *dccp_ackvec_record_slab;
-struct dccp_ackvec *dccp_ackvec_alloc(const gfp_t priority)
+static struct dccp_ackvec_record *dccp_ackvec_record_new(void)
{
- struct dccp_ackvec *av = kmem_cache_zalloc(dccp_ackvec_slab, priority);
-
- if (av != NULL) {
- av->av_buf_head = av->av_buf_tail = DCCPAV_MAX_ACKVEC_LEN - 1;
- INIT_LIST_HEAD(&av->av_records);
- }
- return av;
-}
+ struct dccp_ackvec_record *avr =
+ kmem_cache_alloc(dccp_ackvec_record_slab, GFP_ATOMIC);
-static void dccp_ackvec_purge_records(struct dccp_ackvec *av)
-{
- struct dccp_ackvec_record *cur, *next;
+ if (avr != NULL)
+ INIT_LIST_HEAD(&avr->avr_node);
- list_for_each_entry_safe(cur, next, &av->av_records, avr_node)
- kmem_cache_free(dccp_ackvec_record_slab, cur);
- INIT_LIST_HEAD(&av->av_records);
+ return avr;
}
-void dccp_ackvec_free(struct dccp_ackvec *av)
+static void dccp_ackvec_record_delete(struct dccp_ackvec_record *avr)
{
- if (likely(av != NULL)) {
- dccp_ackvec_purge_records(av);
- kmem_cache_free(dccp_ackvec_slab, av);
- }
+ if (unlikely(avr == NULL))
+ return;
+ /* Check if deleting a linked record */
+ WARN_ON(!list_empty(&avr->avr_node));
+ kmem_cache_free(dccp_ackvec_record_slab, avr);
}
-/**
- * dccp_ackvec_update_records - Record information about sent Ack Vectors
- * @av: Ack Vector records to update
- * @seqno: Sequence number of the packet carrying the Ack Vector just sent
- * @nonce_sum: The sum of all buffer nonces contained in the Ack Vector
- */
-int dccp_ackvec_update_records(struct dccp_ackvec *av, u64 seqno, u8 nonce_sum)
+static void dccp_ackvec_insert_avr(struct dccp_ackvec *av,
+ struct dccp_ackvec_record *avr)
{
- struct dccp_ackvec_record *avr;
-
- avr = kmem_cache_alloc(dccp_ackvec_record_slab, GFP_ATOMIC);
- if (avr == NULL)
- return -ENOBUFS;
-
- avr->avr_ack_seqno = seqno;
- avr->avr_ack_ptr = av->av_buf_head;
- avr->avr_ack_ackno = av->av_buf_ackno;
- avr->avr_ack_nonce = nonce_sum;
- avr->avr_ack_runlen = dccp_ackvec_runlen(av->av_buf + av->av_buf_head);
/*
- * When the buffer overflows, we keep no more than one record. This is
- * the simplest way of disambiguating sender-Acks dating from before the
- * overflow from sender-Acks which refer to after the overflow; a simple
- * solution is preferable here since we are handling an exception.
- */
- if (av->av_overflow)
- dccp_ackvec_purge_records(av);
- /*
- * Since GSS is incremented for each packet, the list is automatically
- * arranged in descending order of @ack_seqno.
+ * AVRs are sorted by seqno. Since we are sending them in order, we
+ * just add the AVR at the head of the list.
+ * -sorbo.
*/
- list_add(&avr->avr_node, &av->av_records);
+ if (!list_empty(&av->av_records)) {
+ const struct dccp_ackvec_record *head =
+ list_entry(av->av_records.next,
+ struct dccp_ackvec_record,
+ avr_node);
+ BUG_ON(before48(avr->avr_ack_seqno, head->avr_ack_seqno));
+ }
- dccp_pr_debug("Added Vector, ack_seqno=%llu, ack_ackno=%llu (rl=%u)\n",
- (unsigned long long)avr->avr_ack_seqno,
- (unsigned long long)avr->avr_ack_ackno,
- avr->avr_ack_runlen);
- return 0;
+ list_add(&avr->avr_node, &av->av_records);
}
-static struct dccp_ackvec_record *dccp_ackvec_lookup(struct list_head *av_list,
- const u64 ackno)
+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 u8 nr_opts = DIV_ROUND_UP(av->av_vec_len, DCCP_SINGLE_OPT_MAXLEN);
+ u16 len = av->av_vec_len + 2 * nr_opts, i;
+ u32 elapsed_time;
+ const unsigned char *tail, *from;
+ unsigned char *to;
struct dccp_ackvec_record *avr;
- /*
- * Exploit that records are inserted in descending order of sequence
- * number, start with the oldest record first. If @ackno is `before'
- * the earliest ack_ackno, the packet is too old to be considered.
- */
- list_for_each_entry_reverse(avr, av_list, avr_node) {
- if (avr->avr_ack_seqno == ackno)
- return avr;
- if (before48(ackno, avr->avr_ack_seqno))
- break;
- }
- return NULL;
-}
-
-/*
- * Buffer index and length computation using modulo-buffersize arithmetic.
- * Note that, as pointers move from right to left, head is `before' tail.
- */
-static inline u16 __ackvec_idx_add(const u16 a, const u16 b)
-{
- return (a + b) % DCCPAV_MAX_ACKVEC_LEN;
-}
+ suseconds_t delta;
-static inline u16 __ackvec_idx_sub(const u16 a, const u16 b)
-{
- return __ackvec_idx_add(a, DCCPAV_MAX_ACKVEC_LEN - b);
-}
+ if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN)
+ return -1;
-u16 dccp_ackvec_buflen(const struct dccp_ackvec *av)
-{
- if (unlikely(av->av_overflow))
- return DCCPAV_MAX_ACKVEC_LEN;
- return __ackvec_idx_sub(av->av_buf_tail, av->av_buf_head);
-}
+ delta = ktime_us_delta(ktime_get_real(), av->av_time);
+ elapsed_time = delta / 10;
-/**
- * dccp_ackvec_update_old - Update previous state as per RFC 4340, 11.4.1
- * @av: non-empty buffer to update
- * @distance: negative or zero distance of @seqno from buf_ackno downward
- * @seqno: the (old) sequence number whose record is to be updated
- * @state: state in which packet carrying @seqno was received
- */
-static void dccp_ackvec_update_old(struct dccp_ackvec *av, s64 distance,
- u64 seqno, enum dccp_ackvec_states state)
-{
- u16 ptr = av->av_buf_head;
+ if (elapsed_time != 0 &&
+ dccp_insert_option_elapsed_time(sk, skb, elapsed_time))
+ return -1;
- BUG_ON(distance > 0);
- if (unlikely(dccp_ackvec_is_empty(av)))
- return;
+ avr = dccp_ackvec_record_new();
+ if (avr == NULL)
+ return -1;
- do {
- u8 runlen = dccp_ackvec_runlen(av->av_buf + ptr);
+ DCCP_SKB_CB(skb)->dccpd_opt_len += len;
- if (distance + runlen >= 0) {
- /*
- * Only update the state if packet has not been received
- * yet. This is OK as per the second table in RFC 4340,
- * 11.4.1; i.e. here we are using the following table:
- * RECEIVED
- * 0 1 3
- * S +---+---+---+
- * T 0 | 0 | 0 | 0 |
- * O +---+---+---+
- * R 1 | 1 | 1 | 1 |
- * E +---+---+---+
- * D 3 | 0 | 1 | 3 |
- * +---+---+---+
- * The "Not Received" state was set by reserve_seats().
- */
- if (av->av_buf[ptr] == DCCPAV_NOT_RECEIVED)
- av->av_buf[ptr] = state;
- else
- dccp_pr_debug("Not changing %llu state to %u\n",
- (unsigned long long)seqno, state);
- break;
- }
+ to = skb_push(skb, len);
+ len = av->av_vec_len;
+ from = av->av_buf + av->av_buf_head;
+ tail = av->av_buf + DCCP_MAX_ACKVEC_LEN;
- distance += runlen + 1;
- ptr = __ackvec_idx_add(ptr, 1);
+ for (i = 0; i < nr_opts; ++i) {
+ int copylen = len;
- } while (ptr != av->av_buf_tail);
-}
+ if (len > DCCP_SINGLE_OPT_MAXLEN)
+ copylen = DCCP_SINGLE_OPT_MAXLEN;
-/* Mark @num entries after buf_head as "Not yet received". */
-static void dccp_ackvec_reserve_seats(struct dccp_ackvec *av, u16 num)
-{
- u16 start = __ackvec_idx_add(av->av_buf_head, 1),
- len = DCCPAV_MAX_ACKVEC_LEN - start;
-
- /* check for buffer wrap-around */
- if (num > len) {
- memset(av->av_buf + start, DCCPAV_NOT_RECEIVED, len);
- start = 0;
- num -= len;
- }
- if (num)
- memset(av->av_buf + start, DCCPAV_NOT_RECEIVED, num);
-}
+ *to++ = DCCPO_ACK_VECTOR_0;
+ *to++ = copylen + 2;
-/**
- * dccp_ackvec_add_new - Record one or more new entries in Ack Vector buffer
- * @av: container of buffer to update (can be empty or non-empty)
- * @num_packets: number of packets to register (must be >= 1)
- * @seqno: sequence number of the first packet in @num_packets
- * @state: state in which packet carrying @seqno was received
- */
-static void dccp_ackvec_add_new(struct dccp_ackvec *av, u32 num_packets,
- u64 seqno, enum dccp_ackvec_states state)
-{
- u32 num_cells = num_packets;
+ /* Check if buf_head wraps */
+ if (from + copylen > tail) {
+ const u16 tailsize = tail - from;
- if (num_packets > DCCPAV_BURST_THRESH) {
- u32 lost_packets = num_packets - 1;
-
- DCCP_WARN("Warning: large burst loss (%u)\n", lost_packets);
- /*
- * We received 1 packet and have a loss of size "num_packets-1"
- * which we squeeze into num_cells-1 rather than reserving an
- * entire byte for each lost packet.
- * The reason is that the vector grows in O(burst_length); when
- * it grows too large there will no room left for the payload.
- * This is a trade-off: if a few packets out of the burst show
- * up later, their state will not be changed; it is simply too
- * costly to reshuffle/reallocate/copy the buffer each time.
- * Should such problems persist, we will need to switch to a
- * different underlying data structure.
- */
- for (num_packets = num_cells = 1; lost_packets; ++num_cells) {
- u8 len = min(lost_packets, (u32)DCCPAV_MAX_RUNLEN);
-
- av->av_buf_head = __ackvec_idx_sub(av->av_buf_head, 1);
- av->av_buf[av->av_buf_head] = DCCPAV_NOT_RECEIVED | len;
-
- lost_packets -= len;
+ memcpy(to, from, tailsize);
+ to += tailsize;
+ len -= tailsize;
+ copylen -= tailsize;
+ from = av->av_buf;
}
- }
- if (num_cells + dccp_ackvec_buflen(av) >= DCCPAV_MAX_ACKVEC_LEN) {
- DCCP_CRIT("Ack Vector buffer overflow: dropping old entries\n");
- av->av_overflow = true;
+ memcpy(to, from, copylen);
+ from += copylen;
+ to += copylen;
+ len -= copylen;
}
- av->av_buf_head = __ackvec_idx_sub(av->av_buf_head, num_packets);
- if (av->av_overflow)
- av->av_buf_tail = av->av_buf_head;
+ /*
+ * From RFC 4340, A.2:
+ *
+ * For each acknowledgement it sends, the HC-Receiver will add an
+ * acknowledgement record. ack_seqno will equal the HC-Receiver
+ * sequence number it used for the ack packet; ack_ptr will equal
+ * buf_head; ack_ackno will equal buf_ackno; and ack_nonce will
+ * equal buf_nonce.
+ */
+ 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;
- av->av_buf[av->av_buf_head] = state;
- av->av_buf_ackno = seqno;
+ dccp_ackvec_insert_avr(av, avr);
- if (num_packets > 1)
- dccp_ackvec_reserve_seats(av, num_packets - 1);
+ dccp_pr_debug("%s ACK Vector 0, len=%d, ack_seqno=%llu, "
+ "ack_ackno=%llu\n",
+ dccp_role(sk), avr->avr_sent_len,
+ (unsigned long long)avr->avr_ack_seqno,
+ (unsigned long long)avr->avr_ack_ackno);
+ return 0;
}
-/**
- * dccp_ackvec_input - Register incoming packet in the buffer
- */
-void dccp_ackvec_input(struct dccp_ackvec *av, struct sk_buff *skb)
+struct dccp_ackvec *dccp_ackvec_alloc(const gfp_t priority)
{
- u64 seqno = DCCP_SKB_CB(skb)->dccpd_seq;
- enum dccp_ackvec_states state = DCCPAV_RECEIVED;
+ struct dccp_ackvec *av = kmem_cache_alloc(dccp_ackvec_slab, priority);
- if (dccp_ackvec_is_empty(av)) {
- dccp_ackvec_add_new(av, 1, seqno, state);
- av->av_tail_ackno = seqno;
+ if (av != NULL) {
+ 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);
+ }
- } else {
- s64 num_packets = dccp_delta_seqno(av->av_buf_ackno, seqno);
- u8 *current_head = av->av_buf + av->av_buf_head;
+ return av;
+}
- if (num_packets == 1 &&
- dccp_ackvec_state(current_head) == state &&
- dccp_ackvec_runlen(current_head) < DCCPAV_MAX_RUNLEN) {
+void dccp_ackvec_free(struct dccp_ackvec *av)
+{
+ if (unlikely(av == NULL))
+ return;
- *current_head += 1;
- av->av_buf_ackno = seqno;
+ if (!list_empty(&av->av_records)) {
+ struct dccp_ackvec_record *avr, *next;
- } else if (num_packets > 0) {
- dccp_ackvec_add_new(av, num_packets, seqno, state);
- } else {
- dccp_ackvec_update_old(av, num_packets, seqno, state);
+ list_for_each_entry_safe(avr, next, &av->av_records, avr_node) {
+ list_del_init(&avr->avr_node);
+ dccp_ackvec_record_delete(avr);
}
}
+
+ 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;
}
/*
unsigned int gap;
long new_head;
- if (av->av_vec_len + packets > DCCPAV_MAX_ACKVEC_LEN)
+ if (av->av_vec_len + packets > DCCP_MAX_ACKVEC_LEN)
return -ENOBUFS;
gap = packets - 1;
if (new_head < 0) {
if (gap > 0) {
- memset(av->av_buf, DCCPAV_NOT_RECEIVED,
+ memset(av->av_buf, DCCP_ACKVEC_STATE_NOT_RECEIVED,
gap + new_head + 1);
gap = -new_head;
}
- new_head += DCCPAV_MAX_ACKVEC_LEN;
+ new_head += DCCP_MAX_ACKVEC_LEN;
}
av->av_buf_head = new_head;
if (gap > 0)
memset(av->av_buf + av->av_buf_head + 1,
- DCCPAV_NOT_RECEIVED, gap);
+ DCCP_ACKVEC_STATE_NOT_RECEIVED, gap);
av->av_buf[av->av_buf_head] = state;
av->av_vec_len += packets;
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
/* See if this is the first ackno being inserted */
if (av->av_vec_len == 0) {
- *cur_head = state;
+ 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(cur_head) == state &&
- dccp_ackvec_runlen(cur_head) < DCCPAV_MAX_RUNLEN)
- *cur_head += 1;
+ 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]++;
else if (dccp_ackvec_set_buf_head_state(av, delta, state))
return -ENOBUFS;
} else {
* 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_runlen(cur_head);
+ const u8 len = dccp_ackvec_len(av, index);
+ const u8 av_state = dccp_ackvec_state(av, index);
/*
* valid packets not yet in av_buf have a reserved
* entry, with a len equal to 0.
*/
- if (*cur_head == DCCPAV_NOT_RECEIVED && delta == 0) {
+ if (av_state == DCCP_ACKVEC_STATE_NOT_RECEIVED &&
+ len == 0 && delta == 0) { /* Found our
+ reserved seat! */
dccp_pr_debug("Found %llu reserved seat!\n",
(unsigned long long)ackno);
- *cur_head = state;
+ av->av_buf[index] = state;
goto out;
}
/* len == 0 means one packet */
goto out_duplicate;
delta -= len + 1;
- if (++cur_head == buf_end)
- cur_head = av->av_buf;
+ if (++index == DCCP_MAX_ACKVEC_LEN)
+ index = 0;
}
}
av->av_buf_ackno = ackno;
+ av->av_time = ktime_get_real();
out:
return 0;
if (av->av_buf_head <= avr->avr_ack_ptr)
av->av_vec_len = avr->avr_ack_ptr - av->av_buf_head;
else
- av->av_vec_len = DCCPAV_MAX_ACKVEC_LEN - 1 -
+ 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->av_records, avr_node) {
- list_del(&avr->avr_node);
- kmem_cache_free(dccp_ackvec_record_slab, avr);
+ list_del_init(&avr->avr_node);
+ dccp_ackvec_record_delete(avr);
}
}
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), avr->avr_ack_runlen,
+ dccp_role(sk), 1,
(unsigned long long)avr->avr_ack_seqno,
(unsigned long long)avr->avr_ack_ackno);
dccp_ackvec_throw_record(av, avr);
*/
avr = list_entry(av->av_records.next, struct dccp_ackvec_record, avr_node);
while (i--) {
- const u8 rl = dccp_ackvec_runlen(vector);
+ const u8 rl = *vector & DCCP_ACKVEC_LEN_MASK;
u64 ackno_end_rl;
dccp_set_seqno(&ackno_end_rl, *ackno - rl);
break;
found:
if (between48(avr->avr_ack_seqno, ackno_end_rl, *ackno)) {
- if (dccp_ackvec_state(vector) != DCCPAV_NOT_RECEIVED) {
+ const u8 state = *vector & DCCP_ACKVEC_STATE_MASK;
+ if (state != DCCP_ACKVEC_STATE_NOT_RECEIVED) {
dccp_pr_debug("%s ACK vector 0, len=%d, "
"ack_seqno=%llu, ack_ackno=%llu, "
"ACKED!\n",
return 0;
}
-/**
- * dccp_ackvec_clear_state - Perform house-keeping / garbage-collection
- * This routine is called when the peer acknowledges the receipt of Ack Vectors
- * up to and including @ackno. While based on on section A.3 of RFC 4340, here
- * are additional precautions to prevent corrupted buffer state. In particular,
- * we use tail_ackno to identify outdated records; it always marks the earliest
- * packet of group (2) in 11.4.2.
- */
-void dccp_ackvec_clear_state(struct dccp_ackvec *av, const u64 ackno)
- {
- struct dccp_ackvec_record *avr, *next;
- u8 runlen_now, eff_runlen;
- s64 delta;
-
- avr = dccp_ackvec_lookup(&av->av_records, ackno);
- if (avr == NULL)
- return;
- /*
- * Deal with outdated acknowledgments: this arises when e.g. there are
- * several old records and the acks from the peer come in slowly. In
- * that case we may still have records that pre-date tail_ackno.
- */
- delta = dccp_delta_seqno(av->av_tail_ackno, avr->avr_ack_ackno);
- if (delta < 0)
- goto free_records;
- /*
- * Deal with overlapping Ack Vectors: don't subtract more than the
- * number of packets between tail_ackno and ack_ackno.
- */
- eff_runlen = delta < avr->avr_ack_runlen ? delta : avr->avr_ack_runlen;
-
- runlen_now = dccp_ackvec_runlen(av->av_buf + avr->avr_ack_ptr);
- /*
- * The run length of Ack Vector cells does not decrease over time. If
- * the run length is the same as at the time the Ack Vector was sent, we
- * free the ack_ptr cell. That cell can however not be freed if the run
- * length has increased: in this case we need to move the tail pointer
- * backwards (towards higher indices), to its next-oldest neighbour.
- */
- if (runlen_now > eff_runlen) {
-
- av->av_buf[avr->avr_ack_ptr] -= eff_runlen + 1;
- av->av_buf_tail = __ackvec_idx_add(avr->avr_ack_ptr, 1);
-
- /* This move may not have cleared the overflow flag. */
- if (av->av_overflow)
- av->av_overflow = (av->av_buf_head == av->av_buf_tail);
- } else {
- av->av_buf_tail = avr->avr_ack_ptr;
- /*
- * We have made sure that avr points to a valid cell within the
- * buffer. This cell is either older than head, or equals head
- * (empty buffer): in both cases we no longer have any overflow.
- */
- av->av_overflow = 0;
- }
-
- /*
- * The peer has acknowledged up to and including ack_ackno. Hence the
- * first packet in group (2) of 11.4.2 is the successor of ack_ackno.
- */
- av->av_tail_ackno = ADD48(avr->avr_ack_ackno, 1);
-
-free_records:
- list_for_each_entry_safe_from(avr, next, &av->av_records, avr_node) {
- list_del(&avr->avr_node);
- kmem_cache_free(dccp_ackvec_record_slab, avr);
- }
-}
-
int __init dccp_ackvec_init(void)
{
dccp_ackvec_slab = kmem_cache_create("dccp_ackvec",
if (dccp_ackvec_slab == NULL)
goto out_err;
- dccp_ackvec_record_slab = kmem_cache_create("dccp_ackvec_record",
- sizeof(struct dccp_ackvec_record),
- 0, SLAB_HWCACHE_ALIGN, NULL);
+ dccp_ackvec_record_slab =
+ kmem_cache_create("dccp_ackvec_record",
+ sizeof(struct dccp_ackvec_record),
+ 0, SLAB_HWCACHE_ALIGN, NULL);
if (dccp_ackvec_record_slab == NULL)
goto out_destroy_slab;
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff