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-rw-r--r--net/dccp/ccids/ccid2.c96
-rw-r--r--net/dccp/ccids/ccid2.h6
2 files changed, 70 insertions, 32 deletions
diff --git a/net/dccp/ccids/ccid2.c b/net/dccp/ccids/ccid2.c
index dbcda7e868b..93a30ae8d07 100644
--- a/net/dccp/ccids/ccid2.c
+++ b/net/dccp/ccids/ccid2.c
@@ -44,8 +44,6 @@ static int ccid2_debug;
#define ccid2_pr_debug(format, a...)
#endif
-static const int ccid2_seq_len = 128;
-
#ifdef CONFIG_IP_DCCP_CCID2_DEBUG
static void ccid2_hc_tx_check_sanity(const struct ccid2_hc_tx_sock *hctx)
{
@@ -71,7 +69,6 @@ static void ccid2_hc_tx_check_sanity(const struct ccid2_hc_tx_sock *hctx)
BUG_ON(seqp->ccid2s_seq <= prev->ccid2s_seq);
BUG_ON(time_before(seqp->ccid2s_sent,
prev->ccid2s_sent));
- BUG_ON(len > ccid2_seq_len);
seqp = prev;
}
@@ -83,16 +80,57 @@ static void ccid2_hc_tx_check_sanity(const struct ccid2_hc_tx_sock *hctx)
do {
seqp = seqp->ccid2s_prev;
len++;
- BUG_ON(len > ccid2_seq_len);
} while (seqp != hctx->ccid2hctx_seqh);
- BUG_ON(len != ccid2_seq_len);
ccid2_pr_debug("total len=%d\n", len);
+ BUG_ON(len != hctx->ccid2hctx_seqbufc * CCID2_SEQBUF_LEN);
}
#else
#define ccid2_hc_tx_check_sanity(hctx) do {} while (0)
#endif
+static int ccid2_hc_tx_alloc_seq(struct ccid2_hc_tx_sock *hctx, int num,
+ gfp_t gfp)
+{
+ struct ccid2_seq *seqp;
+ int i;
+
+ /* check if we have space to preserve the pointer to the buffer */
+ if (hctx->ccid2hctx_seqbufc >= (sizeof(hctx->ccid2hctx_seqbuf) /
+ sizeof(struct ccid2_seq*)))
+ return -ENOMEM;
+
+ /* allocate buffer and initialize linked list */
+ seqp = kmalloc(sizeof(*seqp) * num, gfp);
+ if (seqp == NULL)
+ return -ENOMEM;
+
+ for (i = 0; i < (num - 1); i++) {
+ seqp[i].ccid2s_next = &seqp[i + 1];
+ seqp[i + 1].ccid2s_prev = &seqp[i];
+ }
+ seqp[num - 1].ccid2s_next = seqp;
+ seqp->ccid2s_prev = &seqp[num - 1];
+
+ /* This is the first allocation. Initiate the head and tail. */
+ if (hctx->ccid2hctx_seqbufc == 0)
+ hctx->ccid2hctx_seqh = hctx->ccid2hctx_seqt = seqp;
+ else {
+ /* link the existing list with the one we just created */
+ hctx->ccid2hctx_seqh->ccid2s_next = seqp;
+ seqp->ccid2s_prev = hctx->ccid2hctx_seqh;
+
+ hctx->ccid2hctx_seqt->ccid2s_prev = &seqp[num - 1];
+ seqp[num - 1].ccid2s_next = hctx->ccid2hctx_seqt;
+ }
+
+ /* store the original pointer to the buffer so we can free it */
+ hctx->ccid2hctx_seqbuf[hctx->ccid2hctx_seqbufc] = seqp;
+ hctx->ccid2hctx_seqbufc++;
+
+ return 0;
+}
+
static int ccid2_hc_tx_send_packet(struct sock *sk,
struct sk_buff *skb, int len)
{
@@ -231,6 +269,7 @@ static void ccid2_hc_tx_packet_sent(struct sock *sk, int more, int len)
{
struct dccp_sock *dp = dccp_sk(sk);
struct ccid2_hc_tx_sock *hctx = ccid2_hc_tx_sk(sk);
+ struct ccid2_seq *next;
u64 seq;
ccid2_hc_tx_check_sanity(hctx);
@@ -250,15 +289,23 @@ static void ccid2_hc_tx_packet_sent(struct sock *sk, int more, int len)
hctx->ccid2hctx_seqh->ccid2s_seq = seq;
hctx->ccid2hctx_seqh->ccid2s_acked = 0;
hctx->ccid2hctx_seqh->ccid2s_sent = jiffies;
- hctx->ccid2hctx_seqh = hctx->ccid2hctx_seqh->ccid2s_next;
- ccid2_pr_debug("cwnd=%d pipe=%d\n", hctx->ccid2hctx_cwnd,
- hctx->ccid2hctx_pipe);
+ next = hctx->ccid2hctx_seqh->ccid2s_next;
+ /* check if we need to alloc more space */
+ if (next == hctx->ccid2hctx_seqt) {
+ int rc;
- if (hctx->ccid2hctx_seqh == hctx->ccid2hctx_seqt) {
- /* XXX allocate more space */
- WARN_ON(1);
+ ccid2_pr_debug("allocating more space in history\n");
+ rc = ccid2_hc_tx_alloc_seq(hctx, CCID2_SEQBUF_LEN, GFP_KERNEL);
+ BUG_ON(rc); /* XXX what do we do? */
+
+ next = hctx->ccid2hctx_seqh->ccid2s_next;
+ BUG_ON(next == hctx->ccid2hctx_seqt);
}
+ hctx->ccid2hctx_seqh = next;
+
+ ccid2_pr_debug("cwnd=%d pipe=%d\n", hctx->ccid2hctx_cwnd,
+ hctx->ccid2hctx_pipe);
hctx->ccid2hctx_sent++;
@@ -674,8 +721,6 @@ static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
static int ccid2_hc_tx_init(struct ccid *ccid, struct sock *sk)
{
struct ccid2_hc_tx_sock *hctx = ccid_priv(ccid);
- int seqcount = ccid2_seq_len;
- int i;
hctx->ccid2hctx_cwnd = 1;
/* Initialize ssthresh to infinity. This means that we will exit the
@@ -684,26 +729,12 @@ static int ccid2_hc_tx_init(struct ccid *ccid, struct sock *sk)
*/
hctx->ccid2hctx_ssthresh = ~0;
hctx->ccid2hctx_numdupack = 3;
+ hctx->ccid2hctx_seqbufc = 0;
/* XXX init ~ to window size... */
- hctx->ccid2hctx_seqbuf = kmalloc(sizeof(*hctx->ccid2hctx_seqbuf) *
- seqcount, gfp_any());
- if (hctx->ccid2hctx_seqbuf == NULL)
+ if (ccid2_hc_tx_alloc_seq(hctx, CCID2_SEQBUF_LEN, GFP_ATOMIC) != 0)
return -ENOMEM;
- for (i = 0; i < (seqcount - 1); i++) {
- hctx->ccid2hctx_seqbuf[i].ccid2s_next =
- &hctx->ccid2hctx_seqbuf[i + 1];
- hctx->ccid2hctx_seqbuf[i + 1].ccid2s_prev =
- &hctx->ccid2hctx_seqbuf[i];
- }
- hctx->ccid2hctx_seqbuf[seqcount - 1].ccid2s_next =
- hctx->ccid2hctx_seqbuf;
- hctx->ccid2hctx_seqbuf->ccid2s_prev =
- &hctx->ccid2hctx_seqbuf[seqcount - 1];
-
- hctx->ccid2hctx_seqh = hctx->ccid2hctx_seqbuf;
- hctx->ccid2hctx_seqt = hctx->ccid2hctx_seqh;
hctx->ccid2hctx_sent = 0;
hctx->ccid2hctx_rto = 3 * HZ;
hctx->ccid2hctx_srtt = -1;
@@ -722,10 +753,13 @@ static int ccid2_hc_tx_init(struct ccid *ccid, struct sock *sk)
static void ccid2_hc_tx_exit(struct sock *sk)
{
struct ccid2_hc_tx_sock *hctx = ccid2_hc_tx_sk(sk);
+ int i;
ccid2_hc_tx_kill_rto_timer(sk);
- kfree(hctx->ccid2hctx_seqbuf);
- hctx->ccid2hctx_seqbuf = NULL;
+
+ for (i = 0; i < hctx->ccid2hctx_seqbufc; i++)
+ kfree(hctx->ccid2hctx_seqbuf[i]);
+ hctx->ccid2hctx_seqbufc = 0;
}
static void ccid2_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
diff --git a/net/dccp/ccids/ccid2.h b/net/dccp/ccids/ccid2.h
index b4cc6c0bf02..2a02ce04ba8 100644
--- a/net/dccp/ccids/ccid2.h
+++ b/net/dccp/ccids/ccid2.h
@@ -35,6 +35,9 @@ struct ccid2_seq {
struct ccid2_seq *ccid2s_next;
};
+#define CCID2_SEQBUF_LEN 256
+#define CCID2_SEQBUF_MAX 128
+
/** struct ccid2_hc_tx_sock - CCID2 TX half connection
*
* @ccid2hctx_ssacks - ACKs recv in slow start
@@ -53,7 +56,8 @@ struct ccid2_hc_tx_sock {
unsigned int ccid2hctx_ssthresh;
int ccid2hctx_pipe;
int ccid2hctx_numdupack;
- struct ccid2_seq *ccid2hctx_seqbuf;
+ struct ccid2_seq *ccid2hctx_seqbuf[CCID2_SEQBUF_MAX];
+ int ccid2hctx_seqbufc;
struct ccid2_seq *ccid2hctx_seqh;
struct ccid2_seq *ccid2hctx_seqt;
long ccid2hctx_rto;