Turns out that with cxmac, clearing the header after sending a packet is not enough to make fragmentation work. Instead, we allocate a queuebuf and restore the packet after from the queuebuf after sending it.
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@ -32,7 +32,7 @@
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*
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* This file is part of the Contiki operating system.
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*
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* $Id: sicslowpan.c,v 1.13 2010/02/06 07:49:58 adamdunkels Exp $
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* $Id: sicslowpan.c,v 1.14 2010/02/06 09:42:49 adamdunkels Exp $
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*/
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/**
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* \file
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@ -1180,6 +1180,7 @@ output(uip_lladdr_t *localdest)
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if(uip_len - uncomp_hdr_len > MAC_MAX_PAYLOAD - rime_hdr_len) {
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#if SICSLOWPAN_CONF_FRAG
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struct queuebuf *q;
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/*
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* The outbound IPv6 packet is too large to fit into a single 15.4
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* packet, so we fragment it into multiple packets and send them.
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@ -1212,7 +1213,14 @@ output(uip_lladdr_t *localdest)
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memcpy(rime_ptr + rime_hdr_len,
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(void *)UIP_IP_BUF + uncomp_hdr_len, rime_payload_len);
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packetbuf_set_datalen(rime_payload_len + rime_hdr_len);
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q = queuebuf_new_from_packetbuf();
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if(q == NULL) {
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PRINTFO("could not allocate queuebuf for first fragment, dropping packet\n");
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return 0;
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}
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send_packet(&dest);
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queuebuf_to_packetbuf(q);
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queuebuf_free(q);
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/* set processed_ip_len to what we already sent from the IP payload*/
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processed_ip_len = rime_payload_len + uncomp_hdr_len;
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@ -1243,7 +1251,13 @@ output(uip_lladdr_t *localdest)
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memcpy(rime_ptr + rime_hdr_len,
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(void *)UIP_IP_BUF + processed_ip_len, rime_payload_len);
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packetbuf_set_datalen(rime_payload_len + rime_hdr_len);
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if(q == NULL) {
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PRINTFO("could not allocate queuebuf, dropping fragment\n");
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return 0;
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}
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send_packet(&dest);
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queuebuf_to_packetbuf(q);
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queuebuf_free(q);
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processed_ip_len += rime_payload_len;
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}
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