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ieee802154: 6lowpan: remove tx full-size calc workaround

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This patch removes a workaround for datagram_size calculation while
doing fragmentation on transmit.

Reviewed-by: Stefan Schmidt <stefan@osg.samsung.com>
Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Alexander Aring 2015-09-02 14:21:31 +02:00 committed by Marcel Holtmann
parent 0c4349687f
commit 187625e184
2 changed files with 11 additions and 120 deletions
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113
include/net/6lowpan.h
View file

@ -299,119 +299,6 @@ static inline void lowpan_push_hc_data(u8 **hc_ptr, const void *data,
*hc_ptr += len;
}
static inline u8 lowpan_addr_mode_size(const u8 addr_mode)
{
static const u8 addr_sizes[] = {
[LOWPAN_IPHC_ADDR_00] = 16,
[LOWPAN_IPHC_ADDR_01] = 8,
[LOWPAN_IPHC_ADDR_02] = 2,
[LOWPAN_IPHC_ADDR_03] = 0,
};
return addr_sizes[addr_mode];
}
static inline u8 lowpan_next_hdr_size(const u8 h_enc, u16 *uncomp_header)
{
u8 ret = 1;
if ((h_enc & LOWPAN_NHC_UDP_MASK) == LOWPAN_NHC_UDP_ID) {
*uncomp_header += sizeof(struct udphdr);
switch (h_enc & LOWPAN_NHC_UDP_CS_P_11) {
case LOWPAN_NHC_UDP_CS_P_00:
ret += 4;
break;
case LOWPAN_NHC_UDP_CS_P_01:
case LOWPAN_NHC_UDP_CS_P_10:
ret += 3;
break;
case LOWPAN_NHC_UDP_CS_P_11:
ret++;
break;
default:
break;
}
if (!(h_enc & LOWPAN_NHC_UDP_CS_C))
ret += 2;
}
return ret;
}
/**
* lowpan_uncompress_size - returns skb->len size with uncompressed header
* @skb: sk_buff with 6lowpan header inside
* @datagram_offset: optional to get the datagram_offset value
*
* Returns the skb->len with uncompressed header
*/
static inline u16
lowpan_uncompress_size(const struct sk_buff *skb, u16 *dgram_offset)
{
u16 ret = 2, uncomp_header = sizeof(struct ipv6hdr);
u8 iphc0, iphc1, h_enc;
iphc0 = skb_network_header(skb)[0];
iphc1 = skb_network_header(skb)[1];
switch ((iphc0 & LOWPAN_IPHC_TF) >> 3) {
case 0:
ret += 4;
break;
case 1:
ret += 3;
break;
case 2:
ret++;
break;
default:
break;
}
if (!(iphc0 & LOWPAN_IPHC_NH_C))
ret++;
if (!(iphc0 & 0x03))
ret++;
ret += lowpan_addr_mode_size((iphc1 & LOWPAN_IPHC_SAM) >>
LOWPAN_IPHC_SAM_BIT);
if (iphc1 & LOWPAN_IPHC_M) {
switch ((iphc1 & LOWPAN_IPHC_DAM_11) >>
LOWPAN_IPHC_DAM_BIT) {
case LOWPAN_IPHC_DAM_00:
ret += 16;
break;
case LOWPAN_IPHC_DAM_01:
ret += 6;
break;
case LOWPAN_IPHC_DAM_10:
ret += 4;
break;
case LOWPAN_IPHC_DAM_11:
ret++;
break;
default:
break;
}
} else {
ret += lowpan_addr_mode_size((iphc1 & LOWPAN_IPHC_DAM_11) >>
LOWPAN_IPHC_DAM_BIT);
}
if (iphc0 & LOWPAN_IPHC_NH_C) {
h_enc = skb_network_header(skb)[ret];
ret += lowpan_next_hdr_size(h_enc, &uncomp_header);
}
if (dgram_offset)
*dgram_offset = uncomp_header;
return skb->len + uncomp_header - ret;
}
void lowpan_netdev_setup(struct net_device *dev, enum lowpan_lltypes lltype);
int

18
net/ieee802154/6lowpan/tx.c
View file

@ -123,16 +123,14 @@ lowpan_xmit_fragment(struct sk_buff *skb, const struct ieee802154_hdr *wpan_hdr,
static int
lowpan_xmit_fragmented(struct sk_buff *skb, struct net_device *ldev,
const struct ieee802154_hdr *wpan_hdr)
const struct ieee802154_hdr *wpan_hdr, u16 dgram_size,
u16 dgram_offset)
{
u16 dgram_size, dgram_offset;
__be16 frag_tag;
u8 frag_hdr[5];
int frag_cap, frag_len, payload_cap, rc;
int skb_unprocessed, skb_offset;
dgram_size = lowpan_uncompress_size(skb, &dgram_offset) -
skb->mac_len;
frag_tag = htons(lowpan_dev_info(ldev)->fragment_tag);
lowpan_dev_info(ldev)->fragment_tag++;
@ -187,7 +185,8 @@ err:
return rc;
}
static int lowpan_header(struct sk_buff *skb, struct net_device *ldev)
static int lowpan_header(struct sk_buff *skb, struct net_device *ldev,
u16 *dgram_size, u16 *dgram_offset)
{
struct wpan_dev *wpan_dev = lowpan_dev_info(ldev)->wdev->ieee802154_ptr;
struct ieee802154_addr sa, da;
@ -201,7 +200,10 @@ static int lowpan_header(struct sk_buff *skb, struct net_device *ldev)
daddr = &info.daddr.u.extended_addr;
saddr = &info.saddr.u.extended_addr;
*dgram_size = skb->len;
lowpan_header_compress(skb, ldev, ETH_P_IPV6, daddr, saddr, skb->len);
/* dgram_offset = (saved bytes after compression) + lowpan header len */
*dgram_offset = (*dgram_size - skb->len) + skb_network_header_len(skb);
cb->type = IEEE802154_FC_TYPE_DATA;
@ -234,6 +236,7 @@ netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *ldev)
{
struct ieee802154_hdr wpan_hdr;
int max_single, ret;
u16 dgram_size, dgram_offset;
pr_debug("package xmit\n");
@ -244,7 +247,7 @@ netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *ldev)
if (!skb)
return NET_XMIT_DROP;
ret = lowpan_header(skb, ldev);
ret = lowpan_header(skb, ldev, &dgram_size, &dgram_offset);
if (ret < 0) {
kfree_skb(skb);
return NET_XMIT_DROP;
@ -264,7 +267,8 @@ netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *ldev)
netdev_tx_t rc;
pr_debug("frame is too big, fragmentation is needed\n");
rc = lowpan_xmit_fragmented(skb, ldev, &wpan_hdr);
rc = lowpan_xmit_fragmented(skb, ldev, &wpan_hdr, dgram_size,
dgram_offset);
return rc < 0 ? NET_XMIT_DROP : rc;
}