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Merge pull request #12599 from miri64/gnrc_sixlowpan_frag/enh/remove-code-dup

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gnrc_sixlowpan_frag: various optimizations and clean-ups on sending
This commit is contained in:
Martine Lenders 2019-11-04 19:54:33 +01:00 committed by GitHub
commit 79c8fc5405
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 25 additions and 45 deletions
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66
sys/net/gnrc/network_layer/sixlowpan/frag/gnrc_sixlowpan_frag.c
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@ -103,10 +103,8 @@ static gnrc_pktsnip_t *_build_frag_pkt(gnrc_pktsnip_t *pkt,
}
new_netif_hdr = netif->data;
new_netif_hdr->if_pid = netif_hdr->if_pid;
new_netif_hdr->flags = netif_hdr->flags;
new_netif_hdr->rssi = netif_hdr->rssi;
new_netif_hdr->lqi = netif_hdr->lqi;
/* src_l2addr_len and dst_l2addr_len are already the same, now copy the rest */
*new_netif_hdr = *netif_hdr;
frag = gnrc_pktbuf_add(NULL, NULL, fragment_size, GNRC_NETTYPE_SIXLOWPAN);
@ -126,6 +124,22 @@ static gnrc_pktsnip_t *_build_frag_pkt(gnrc_pktsnip_t *pkt,
return frag;
}
static uint16_t _copy_pkt_to_frag(uint8_t *data, const gnrc_pktsnip_t *pkt,
uint16_t max_frag_size, uint16_t init_offset)
{
uint16_t offset = init_offset;
while ((pkt != NULL) && (offset < max_frag_size)) {
uint16_t len = _min(max_frag_size - offset, pkt->size);
memcpy(data + offset, pkt->data, len);
offset += len;
pkt = pkt->next;
}
return offset;
}
static uint16_t _send_1st_fragment(gnrc_netif_t *iface,
gnrc_sixlowpan_msg_frag_t *fragment_msg,
size_t payload_len)
@ -136,7 +150,7 @@ static uint16_t _send_1st_fragment(gnrc_netif_t *iface,
/* payload_len: actual size of the packet vs
* datagram_size: size of the uncompressed IPv6 packet */
int payload_diff = _payload_diff(fragment_msg, payload_len);
uint16_t local_offset = 0;
uint16_t local_offset;
/* virtually add payload_diff to flooring to account for offset (must be divisable by 8)
* in uncompressed datagram */
uint16_t max_frag_size = _floor8(_max_frag_size(iface, fragment_msg) +
@ -161,19 +175,7 @@ static uint16_t _send_1st_fragment(gnrc_netif_t *iface,
netif_hdr->flags |= GNRC_NETIF_HDR_FLAGS_MORE_DATA;
pkt = pkt->next; /* don't copy netif header */
while (pkt != NULL) {
size_t clen = _min(max_frag_size - local_offset, pkt->size);
memcpy(data + local_offset, pkt->data, clen);
local_offset += clen;
if (local_offset >= max_frag_size) {
break;
}
pkt = pkt->next;
}
local_offset = _copy_pkt_to_frag(data, pkt, max_frag_size, 0);
DEBUG("6lo frag: send first fragment (datagram size: %u, "
"datagram tag: %" PRIu16 ", fragment size: %" PRIu16 ")\n",
@ -212,7 +214,6 @@ static uint16_t _send_nth_fragment(gnrc_netif_t *iface,
hdr->offset = (uint8_t)((offset + _payload_diff(fragment_msg,
payload_len)) >> 3);
pkt = pkt->next; /* don't copy netif header */
while ((pkt != NULL) && (offset_count != offset)) { /* go to offset */
offset_count += (uint16_t)pkt->size;
@ -223,40 +224,19 @@ static uint16_t _send_nth_fragment(gnrc_netif_t *iface,
memcpy(data, ((uint8_t *)pkt->data) + pkt_offset, clen);
local_offset = clen;
if (local_offset == max_frag_size) {
if ((clen < (pkt->size - pkt_offset)) || (pkt->next != NULL)) {
/* Tell the link layer that we will send more fragments */
gnrc_netif_hdr_t *netif_hdr = frag->data;
netif_hdr->flags |= GNRC_NETIF_HDR_FLAGS_MORE_DATA;
}
}
pkt = pkt->next;
break;
}
pkt = pkt->next;
}
/* copy remaining packet snips */
local_offset = _copy_pkt_to_frag(data, pkt, max_frag_size, local_offset);
if (local_offset < max_frag_size) { /* copy other packet snips */
while (pkt != NULL) {
size_t clen = _min(max_frag_size - local_offset, pkt->size);
memcpy(data + local_offset, pkt->data, clen);
local_offset += clen;
if (local_offset == max_frag_size) {
if ((clen < pkt->size) || (pkt->next != NULL)) {
/* Tell the link layer that we will send more fragments */
if ((offset + local_offset) < payload_len) {
gnrc_netif_hdr_t *netif_hdr = frag->data;
netif_hdr->flags |= GNRC_NETIF_HDR_FLAGS_MORE_DATA;
}
break;
}
pkt = pkt->next;
}
}
DEBUG("6lo frag: send subsequent fragment (datagram size: %u, "
"datagram tag: %" PRIu16 ", offset: %" PRIu8 " (%u bytes), "
"fragment size: %" PRIu16 ")\n",