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lowpan6: Rework to speed up dequeue datagram process
Current implementation iterates the lowpan6_data.reass_list every time dequeue_datagram() is called. We can get previous lrh in all the context calling dequeue_datagram(). By adding a prev arguemnt to dequeue_datagram(), we can speed up the dequeue datagram process. All the callers never check return value of dequeue_datagram() as it always return ERR_OR, thus make it return void instead. Signed-off-by: Axel Lin <axel.lin@ingics.com> Acked-by: Simon Goldschmidt <goldsimon@gmx.de>
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909037c2ca
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10ae311a93
@ -110,7 +110,7 @@ static const struct ieee_802154_addr ieee_802154_broadcast = {2, {0xff, 0xff}};
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static struct ieee_802154_addr short_mac_addr = {2, {0, 0}};
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#endif /* LWIP_6LOWPAN_INFER_SHORT_ADDRESS */
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static err_t dequeue_datagram(struct lowpan6_reass_helper *lrh);
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static void dequeue_datagram(struct lowpan6_reass_helper *lrh, struct lowpan6_reass_helper *prev);
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static void
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free_reass_datagram(struct lowpan6_reass_helper *lrh)
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@ -132,41 +132,34 @@ free_reass_datagram(struct lowpan6_reass_helper *lrh)
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void
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lowpan6_tmr(void)
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{
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struct lowpan6_reass_helper *lrh, *lrh_temp;
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struct lowpan6_reass_helper *lrh, *lrh_next, *lrh_prev = NULL;
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lrh = lowpan6_data.reass_list;
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while (lrh != NULL) {
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lrh_temp = lrh->next_packet;
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lrh_next = lrh->next_packet;
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if ((--lrh->timer) == 0) {
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dequeue_datagram(lrh);
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dequeue_datagram(lrh, lrh_prev);
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free_reass_datagram(lrh);
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} else {
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lrh_prev = lrh;
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}
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lrh = lrh_temp;
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lrh = lrh_next;
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}
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}
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/**
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* Removes a datagram from the reassembly queue.
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**/
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static err_t
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dequeue_datagram(struct lowpan6_reass_helper *lrh)
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static void
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dequeue_datagram(struct lowpan6_reass_helper *lrh, struct lowpan6_reass_helper *prev)
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{
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struct lowpan6_reass_helper *lrh_temp;
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if (lowpan6_data.reass_list == lrh) {
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lowpan6_data.reass_list = lowpan6_data.reass_list->next_packet;
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} else {
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lrh_temp = lowpan6_data.reass_list;
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while (lrh_temp != NULL) {
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if (lrh_temp->next_packet == lrh) {
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lrh_temp->next_packet = lrh->next_packet;
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break;
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/* it wasn't the first, so it must have a valid 'prev' */
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LWIP_ASSERT("sanity check linked list", prev != NULL);
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prev->next_packet = lrh->next_packet;
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}
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lrh_temp = lrh_temp->next_packet;
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}
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}
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return ERR_OK;
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}
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/** Write the IEEE 802.15.4 header that encapsulates the 6LoWPAN frame.
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@ -1281,7 +1274,7 @@ lowpan6_input(struct pbuf *p, struct netif *netif)
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struct ieee_802154_addr src, dest;
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u16_t datagram_size = 0;
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u16_t datagram_offset, datagram_tag;
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struct lowpan6_reass_helper *lrh, *lrh_temp;
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struct lowpan6_reass_helper *lrh, *lrh_next, *lrh_prev = NULL;
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if (p == NULL) {
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return ERR_OK;
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@ -1310,6 +1303,8 @@ lowpan6_input(struct pbuf *p, struct netif *netif)
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/* check for duplicate */
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lrh = lowpan6_data.reass_list;
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while (lrh != NULL) {
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uint8_t discard = 0;
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lrh_next = lrh->next_packet;
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if ((lrh->sender_addr.addr_len == src.addr_len) &&
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(memcmp(lrh->sender_addr.addr, src.addr, src.addr_len) == 0)) {
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/* address match with packet in reassembly. */
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@ -1318,17 +1313,17 @@ lowpan6_input(struct pbuf *p, struct netif *netif)
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goto lowpan6_input_discard;
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} else {
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/* We are receiving the start of a new datagram. Discard old one (incomplete). */
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lrh_temp = lrh->next_packet;
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dequeue_datagram(lrh);
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discard = 1;
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}
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}
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if (discard) {
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dequeue_datagram(lrh, lrh_prev);
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free_reass_datagram(lrh);
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/* Check next datagram in queue. */
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lrh = lrh_temp;
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}
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} else {
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/* Check next datagram in queue. */
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lrh = lrh->next_packet;
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lrh_prev = lrh;
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}
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/* Check next datagram in queue. */
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lrh = lrh_next;
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}
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pbuf_remove_header(p, 4); /* hide frag1 dispatch */
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@ -1370,7 +1365,7 @@ lowpan6_input(struct pbuf *p, struct netif *netif)
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datagram_offset = (u16_t)puc[4] << 3;
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pbuf_remove_header(p, 4); /* hide frag1 dispatch but keep datagram offset for reassembly */
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for (lrh = lowpan6_data.reass_list; lrh != NULL; lrh = lrh->next_packet) {
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for (lrh = lowpan6_data.reass_list; lrh != NULL; lrh_prev = lrh, lrh = lrh->next_packet) {
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if ((lrh->sender_addr.addr_len == src.addr_len) &&
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(memcmp(lrh->sender_addr.addr, src.addr, src.addr_len) == 0) &&
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(datagram_tag == lrh->datagram_tag) &&
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@ -1389,7 +1384,7 @@ lowpan6_input(struct pbuf *p, struct netif *netif)
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/* FRAG1 already received, check this offset against first len */
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if (datagram_offset < lrh->reass->len) {
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/* fragment overlap, discard old fragments */
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dequeue_datagram(lrh);
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dequeue_datagram(lrh, lrh_prev);
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free_reass_datagram(lrh);
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goto lowpan6_input_discard;
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}
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@ -1407,7 +1402,7 @@ lowpan6_input(struct pbuf *p, struct netif *netif)
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if (datagram_offset < q_datagram_offset) {
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if (datagram_offset + new_frag_len > q_datagram_offset) {
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/* overlap, discard old fragments */
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dequeue_datagram(lrh);
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dequeue_datagram(lrh, lrh_prev);
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free_reass_datagram(lrh);
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goto lowpan6_input_discard;
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}
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@ -1416,7 +1411,7 @@ lowpan6_input(struct pbuf *p, struct netif *netif)
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} else if (datagram_offset == q_datagram_offset) {
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if (q_frag_len != new_frag_len) {
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/* fragment mismatch, discard old fragments */
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dequeue_datagram(lrh);
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dequeue_datagram(lrh, lrh_prev);
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free_reass_datagram(lrh);
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goto lowpan6_input_discard;
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}
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@ -1460,7 +1455,7 @@ lowpan6_input(struct pbuf *p, struct netif *netif)
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q->next = lrh->frags;
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lrh->frags = NULL;
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lrh->reass = NULL;
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dequeue_datagram(lrh);
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dequeue_datagram(lrh, lrh_prev);
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mem_free(lrh);
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/* @todo: distinguish unicast/multicast */
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