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Added clear, reset and number of fragments to be sent; better debugging

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This commit is contained in:
frekky 2015-09-28 12:57:33 +08:00
parent 33525e5086
commit bd9966836e
2 changed files with 91 additions and 31 deletions
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97
src/window.c
View File

@ -25,6 +25,8 @@
#include "common.h" #include "common.h"
#include "window.h" #include "window.h"
int window_debug = 0;
struct frag_buffer * struct frag_buffer *
window_buffer_init(size_t length, unsigned windowsize, unsigned fragsize, int dir) window_buffer_init(size_t length, unsigned windowsize, unsigned fragsize, int dir)
{ {
@ -53,6 +55,20 @@ window_buffer_init(size_t length, unsigned windowsize, unsigned fragsize, int di
return buf; return buf;
} }
void
window_buffer_reset(struct frag_buffer *w)
{
w->chunk_start = 0;
w->cur_seq_id = 0;
w->last_write = 0;
w->numitems = 0;
w->oos = 0;
w->resends = 0;
w->start_seq_id = 0;
w->window_start = 0;
w->window_end = AFTER(w, w->windowsize);
}
void void
window_buffer_resize(struct frag_buffer *w, size_t length) window_buffer_resize(struct frag_buffer *w, size_t length)
{ {
@ -66,11 +82,7 @@ window_buffer_resize(struct frag_buffer *w, size_t length)
errx(1, "Failed to resize window buffer!"); errx(1, "Failed to resize window buffer!");
} }
w->length = length; w->length = length;
w->numitems = 0; window_buffer_reset(w);
w->window_start = 0;
w->start_seq_id = 0;
w->cur_seq_id = 0;
w->window_end = AFTER(w, w->windowsize);
} }
void void
@ -81,6 +93,15 @@ window_buffer_destroy(struct frag_buffer *w)
free(w); free(w);
} }
void
window_buffer_clear(struct frag_buffer *w)
{
if (!w) return;
memset(w->frags, 0, w->length * sizeof(fragment));
window_buffer_reset(w);
}
/* Returns number of available fragment slots (NOT BYTES) */ /* Returns number of available fragment slots (NOT BYTES) */
size_t size_t
window_buffer_available(struct frag_buffer *w) window_buffer_available(struct frag_buffer *w)
@ -99,7 +120,8 @@ window_append_fragment(struct frag_buffer *w, fragment *src)
return 1; return 1;
} }
/* Handles fragment received from the sending side (RECV) */ /* Handles fragment received from the sending side (RECV)
* Returns seq ID of packet to be ACKed immediately */
int int
window_process_incoming_fragment(struct frag_buffer *w, fragment *f) window_process_incoming_fragment(struct frag_buffer *w, fragment *f)
{ {
@ -109,8 +131,11 @@ window_process_incoming_fragment(struct frag_buffer *w, fragment *f)
startid = w->start_seq_id; startid = w->start_seq_id;
endid = (w->start_seq_id + w->windowsize) % MAX_SEQ_ID; endid = (w->start_seq_id + w->windowsize) % MAX_SEQ_ID;
if (!INWINDOW_SEQ(startid, endid, f->seqID)) { if (!INWINDOW_SEQ(startid, endid, f->seqID)) {
DEBUG("Dropping frag with seqID %u: not in window (%u-%u)\n", f->seqID, startid, endid); DEBUG("Dropping frag with seqID %u: not in window (%u-%u)\n",
return 0; f->seqID, startid, endid);
w->oos++;
/* ACK duplicate so sender can move on ASAP */
return f->seqID;
} }
/* Place fragment into correct location in buffer */ /* Place fragment into correct location in buffer */
size_t dest = WRAP(w->window_start + SEQ_OFFSET(startid, f->seqID)); size_t dest = WRAP(w->window_start + SEQ_OFFSET(startid, f->seqID));
@ -119,14 +144,17 @@ window_process_incoming_fragment(struct frag_buffer *w, fragment *f)
fd = &w->frags[dest]; fd = &w->frags[dest];
if (fd->len != 0) { if (fd->len != 0) {
DEBUG("Received duplicate frag, dropping. (prev %u/new %u)", fd->seqID, f->seqID); DEBUG("Received duplicate frag, dropping. (prev %u/new %u)", fd->seqID, f->seqID);
return 0; if (f->seqID == fd->seqID)
return f->seqID;
} }
memcpy(fd, f, sizeof(fragment)); memcpy(fd, f, sizeof(fragment));
fd->retries = 0; fd->retries = 0;
fd->ack_other = -1; fd->ack_other = -1;
fd->acks = 0; /* We assume this packet gets ACKed immediately on return of this function */
fd->acks = 1;
w->numitems ++; w->numitems ++;
return 1;
return f->seqID;
} }
/* Reassembles first complete sequence of fragments into data. (RECV) /* Reassembles first complete sequence of fragments into data. (RECV)
@ -139,7 +167,7 @@ window_reassemble_data(struct frag_buffer *w, uint8_t *data, size_t maxlen, int
dest = data; dest = data;
if (w->direction != WINDOW_RECVING) if (w->direction != WINDOW_RECVING)
return 0; return 0;
if (w->frags[w->chunk_start].start == 0) { if (w->frags[w->chunk_start].start == 0 && w->numitems > 0) {
DEBUG("chunk_start (%lu)pointing to non-start fragment (seq %u, len %lu)!", DEBUG("chunk_start (%lu)pointing to non-start fragment (seq %u, len %lu)!",
w->chunk_start, w->frags[w->chunk_start].seqID, w->frags[w->chunk_start].len); w->chunk_start, w->frags[w->chunk_start].seqID, w->frags[w->chunk_start].len);
return 0; return 0;
@ -191,29 +219,50 @@ window_reassemble_data(struct frag_buffer *w, uint8_t *data, size_t maxlen, int
if (end == 0) { /* no end of chunk found but reached end of data */ if (end == 0) { /* no end of chunk found but reached end of data */
return 0; return 0;
} }
DEBUG("Reassembling %lu bytes of data from %lu frags!", datalen, i + 1); DEBUG("Reassembling %lu bytes of data from %lu frags; compression %d!", datalen, i + 1, *compression);
/* Clear all used fragments */ /* Clear all used fragments */
size_t p; size_t p;
ITER_FORWARD(w->chunk_start, WRAP(w->chunk_start + i + 1), w->length, p, { ITER_FORWARD(w->chunk_start, WRAP(w->chunk_start + i + 1), w->length, p,
memset(&w->frags[p], 0, sizeof(fragment)); memset(&w->frags[p], 0, sizeof(fragment));
}); );
w->chunk_start = WRAP(woffs + 1); w->chunk_start = WRAP(woffs + 1);
w->numitems -= i + 1; w->numitems -= i + 1;
return datalen; return datalen;
} }
/* Returns number of fragments that can be sent immediately; effectively
* the same as window_get_next_sending_fragment but without changing anything. */
int
window_sending(struct frag_buffer *w)
{
fragment *f;
int tosend = 0;
if (w->numitems == 0)
return 0;
for (size_t i = 0; i < w->windowsize; i++) {
f = &w->frags[WRAP(w->window_start + i)];
if (f->len == 0 || f->acks >= 1) continue;
if ((f->retries == 0) != (difftime(time(NULL), f->lastsent) > ACK_TIMEOUT)) {
/* Fragment not sent xor timed out (to be re-sent) */
tosend++;
}
}
return tosend;
}
/* Returns next fragment to be sent or NULL if nothing (SEND) /* Returns next fragment to be sent or NULL if nothing (SEND)
* This also handles packet resends, timeouts etc. */ * This also handles packet resends, timeouts etc. */
fragment * fragment *
window_get_next_sending_fragment(struct frag_buffer *w, int *other_ack) window_get_next_sending_fragment(struct frag_buffer *w, int *other_ack)
{ {
fragment *f; fragment *f = NULL;
if (*other_ack >= MAX_SEQ_ID || *other_ack < 0) if (*other_ack >= MAX_SEQ_ID || *other_ack < 0)
*other_ack = -1; *other_ack = -1;
for (size_t i = 0; i < w->windowsize; i++) { for (size_t i = 0; i < w->windowsize; i++) {
f = &w->frags[WRAP(w->window_start + i)]; f = &w->frags[WRAP(w->window_start + i)];
if (f->acks >= 1) continue; if (f->acks >= 1) continue;
if (f->retries >= 1 && difftime(f->lastsent, time(NULL)) > ACK_TIMEOUT) { /* TODO: use timeval for more precise timeouts */
if (f->retries >= 1 && difftime(time(NULL), f->lastsent) > ACK_TIMEOUT) {
/* Fragment sent before, not ACK'd */ /* Fragment sent before, not ACK'd */
DEBUG("Sending fragment %u again, %u retries so far, %u resent overall\n", f->seqID, f->retries, w->resends); DEBUG("Sending fragment %u again, %u retries so far, %u resent overall\n", f->seqID, f->retries, w->resends);
w->resends ++; w->resends ++;
@ -224,16 +273,16 @@ window_get_next_sending_fragment(struct frag_buffer *w, int *other_ack)
} }
} }
if (f)
DEBUG("Not sending any fragments (last frag checked: retries %u, seqid %u, len %lu)", DEBUG("Not sending any fragments (last frag checked: retries %u, seqid %u, len %lu)",
f->retries, f->seqID, f->len); f->retries, f->seqID, f->len);
// TODO: statistics for packet loss/not sending etc
return NULL; return NULL;
found: found:
/* store other ACK into fragment so ACK is resent if fragment times out */ /* store other ACK into fragment for sending; ignore any previous values.
if (f->ack_other == -1) Don't resend ACKs because by the time we do, the other end will have
resent the corresponding fragment so may as well not cause trouble. */
f->ack_other = *other_ack, *other_ack = -1; f->ack_other = *other_ack, *other_ack = -1;
f->is_nack &= 1;
f->start &= 1; f->start &= 1;
f->end &= 1; f->end &= 1;
f->retries++; f->retries++;
@ -265,7 +314,8 @@ window_ack(struct frag_buffer *w, int seqid)
for (size_t i = 0; i < w->windowsize; i++) { for (size_t i = 0; i < w->windowsize; i++) {
f = &w->frags[AFTER(w, i)]; f = &w->frags[AFTER(w, i)];
if (f->seqID == seqid && f->len > 0) { /* ACK first non-empty frag */ if (f->seqID == seqid && f->len > 0) { /* ACK first non-empty frag */
if (f->acks > 0) DEBUG("ACK: %d ACKs for seqId %u", f->acks, seqid); if (f->acks > 0)
DEBUG("DUPE ACK: %d ACKs for seqId %u", f->acks, seqid);
f->acks ++; f->acks ++;
DEBUG(" ACK frag seq %u, ACKs %u, len %lu, s %u e %u", f->seqID, f->acks, f->len, f->start, f->end); DEBUG(" ACK frag seq %u, ACKs %u, len %lu, s %u e %u", f->seqID, f->acks, f->len, f->start, f->end);
break; break;
@ -309,7 +359,7 @@ window_add_outgoing_data(struct frag_buffer *w, uint8_t *data, size_t len, int c
compressed &= 1; compressed &= 1;
size_t offset = 0; size_t offset = 0;
static fragment f; static fragment f;
// DEBUG("add data len %lu, %lu frags, max fragsize %u", len, n, w->maxfraglen); DEBUG("add data len %lu, %lu frags, max fragsize %u", len, n, w->maxfraglen);
for (size_t i = 0; i < n; i++) { for (size_t i = 0; i < n; i++) {
memset(&f, 0, sizeof(f)); memset(&f, 0, sizeof(f));
f.len = MIN(len - offset, w->maxfraglen); f.len = MIN(len - offset, w->maxfraglen);
@ -321,7 +371,6 @@ window_add_outgoing_data(struct frag_buffer *w, uint8_t *data, size_t len, int c
f.ack_other = -1; f.ack_other = -1;
window_append_fragment(w, &f); window_append_fragment(w, &f);
w->cur_seq_id = (w->cur_seq_id + 1) % MAX_SEQ_ID; w->cur_seq_id = (w->cur_seq_id + 1) % MAX_SEQ_ID;
// DEBUG(" a = %u, b = %u, a %% b = %u", (len - offset), (w->maxfraglen + 1), (len - offset) % (w->maxfraglen + 1));
DEBUG(" fragment len %lu, seqID %u, s %u, end %u, dOffs %lu", f.len, f.seqID, f.start, f.end, offset); DEBUG(" fragment len %lu, seqID %u, s %u, end %u, dOffs %lu", f.len, f.seqID, f.start, f.end, offset);
offset += f.len; offset += f.len;
} }

17
src/window.h
View File

@ -32,7 +32,6 @@ typedef struct fragment {
size_t len; /* Length of fragment data (0 if fragment unused) */ size_t len; /* Length of fragment data (0 if fragment unused) */
unsigned seqID; /* fragment sequence ID */ unsigned seqID; /* fragment sequence ID */
int ack_other; /* other way ACK seqID (>=0) or unset (<0) */ int ack_other; /* other way ACK seqID (>=0) or unset (<0) */
int is_nack; /* 1 if other way ACK is a NACK */
int compressed; /* compression flag */ int compressed; /* compression flag */
uint8_t start; /* start of chunk flag */ uint8_t start; /* start of chunk flag */
uint8_t end; /* end of chunk flag */ uint8_t end; /* end of chunk flag */
@ -55,11 +54,14 @@ struct frag_buffer {
unsigned cur_seq_id; /* Most recent sequence ID */ unsigned cur_seq_id; /* Most recent sequence ID */
unsigned start_seq_id; /* Start of window sequence ID */ unsigned start_seq_id; /* Start of window sequence ID */
unsigned resends; /* number of fragments resent */ unsigned resends; /* number of fragments resent */
unsigned oos; /* Number of out-of-sequence fragments received */
int direction; /* Sending or recving */ int direction; /* Sending or recving */
}; };
#ifdef WINDOW_DEBUG extern int window_debug;
#define DEBUG(msg, ...) fprintf(stderr, "[WINDOW-DEBUG] (%s:%d) " msg "\n", __FILE__, __LINE__, ##__VA_ARGS__)
#ifdef DEBUG_BUILD
#define DEBUG(msg, ...) if (window_debug) fprintf(stderr, "[WINDOW-DEBUG] (%s:%d) " msg "\n", __FILE__, __LINE__, ##__VA_ARGS__)
#else #else
#define DEBUG(msg, ...) #define DEBUG(msg, ...)
#endif #endif
@ -94,6 +96,12 @@ struct frag_buffer *window_buffer_init(size_t length, unsigned windowsize, unsig
void window_buffer_resize(struct frag_buffer *w, size_t length); void window_buffer_resize(struct frag_buffer *w, size_t length);
void window_buffer_destroy(struct frag_buffer *w); void window_buffer_destroy(struct frag_buffer *w);
/* Clears fragments and resets window stats */
void window_buffer_clear(struct frag_buffer *w);
/* Resets window stats without clearing fragments */
void window_buffer_reset(struct frag_buffer *w);
/* Returns number of available fragment slots (NOT BYTES) */ /* Returns number of available fragment slots (NOT BYTES) */
size_t window_buffer_available(struct frag_buffer *w); size_t window_buffer_available(struct frag_buffer *w);
@ -107,6 +115,9 @@ int window_process_incoming_fragment(struct frag_buffer *w, fragment *f);
* Returns length of data reassembled, or 0 if no data reassembled */ * Returns length of data reassembled, or 0 if no data reassembled */
size_t window_reassemble_data(struct frag_buffer *w, uint8_t *data, size_t maxlen, int *compression); size_t window_reassemble_data(struct frag_buffer *w, uint8_t *data, size_t maxlen, int *compression);
/* Returns number of fragments to be sent */
int window_sending(struct frag_buffer *w);
/* Returns next fragment to be sent or NULL if nothing (SEND) */ /* Returns next fragment to be sent or NULL if nothing (SEND) */
fragment *window_get_next_sending_fragment(struct frag_buffer *w, int *other_ack); fragment *window_get_next_sending_fragment(struct frag_buffer *w, int *other_ack);