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| author | Alexander Aring <alex.aring@gmail.com> | 2013-12-17 14:21:28 +0100 |
|---|---|---|
| committer | Marcel Holtmann <marcel@holtmann.org> | 2013-12-17 06:16:48 -0800 |
| commit | c567c77101f082d1a97582e7606877b9e7e4d7d0 (patch) | |
| tree | 9362cddc4dfacf9ed0a5221444d48109b945364b /net/ieee802154 | |
| parent | 45939d2570e4c9120a732464b2dca9c0e5606eb2 (diff) | |
| download | linux-c567c77101f082d1a97582e7606877b9e7e4d7d0.tar.bz2 | |
6lowpan: cleanup udp compress function
This patch remove unnecessary casts and brackets in compress_udp_header
function.
Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Diffstat (limited to 'net/ieee802154')
| -rw-r--r-- | net/ieee802154/6lowpan_iphc.c | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/net/ieee802154/6lowpan_iphc.c b/net/ieee802154/6lowpan_iphc.c index b298bfc14943..11840f9e46da 100644 --- a/net/ieee802154/6lowpan_iphc.c +++ b/net/ieee802154/6lowpan_iphc.c @@ -553,33 +553,43 @@ static void compress_udp_header(u8 **hc06_ptr, struct sk_buff *skb) ((ntohs(uh->dest) & LOWPAN_NHC_UDP_4BIT_MASK) == LOWPAN_NHC_UDP_4BIT_PORT)) { pr_debug("UDP header: both ports compression to 4 bits\n"); + /* compression value */ tmp = LOWPAN_NHC_UDP_CS_P_11; lowpan_push_hc_data(hc06_ptr, &tmp, sizeof(tmp)); - tmp = /* subtraction is faster */ - (u8)((ntohs(uh->dest) - LOWPAN_NHC_UDP_4BIT_PORT) + - ((ntohs(uh->source) - LOWPAN_NHC_UDP_4BIT_PORT) << 4)); + /* source and destination port */ + tmp = ntohs(uh->dest) - LOWPAN_NHC_UDP_4BIT_PORT + + ((ntohs(uh->source) - LOWPAN_NHC_UDP_4BIT_PORT) << 4); lowpan_push_hc_data(hc06_ptr, &tmp, sizeof(tmp)); } else if ((ntohs(uh->dest) & LOWPAN_NHC_UDP_8BIT_MASK) == LOWPAN_NHC_UDP_8BIT_PORT) { pr_debug("UDP header: remove 8 bits of dest\n"); + /* compression value */ tmp = LOWPAN_NHC_UDP_CS_P_01; lowpan_push_hc_data(hc06_ptr, &tmp, sizeof(tmp)); + /* source port */ lowpan_push_hc_data(hc06_ptr, &uh->source, sizeof(uh->source)); - tmp = (u8)(ntohs(uh->dest) - LOWPAN_NHC_UDP_8BIT_PORT); + /* destination port */ + tmp = ntohs(uh->dest) - LOWPAN_NHC_UDP_8BIT_PORT; lowpan_push_hc_data(hc06_ptr, &tmp, sizeof(tmp)); } else if ((ntohs(uh->source) & LOWPAN_NHC_UDP_8BIT_MASK) == LOWPAN_NHC_UDP_8BIT_PORT) { pr_debug("UDP header: remove 8 bits of source\n"); + /* compression value */ tmp = LOWPAN_NHC_UDP_CS_P_10; lowpan_push_hc_data(hc06_ptr, &tmp, sizeof(tmp)); - tmp = (u8)(ntohs(uh->source) - LOWPAN_NHC_UDP_8BIT_PORT); + /* source port */ + tmp = ntohs(uh->source) - LOWPAN_NHC_UDP_8BIT_PORT; lowpan_push_hc_data(hc06_ptr, &tmp, sizeof(tmp)); + /* destination port */ lowpan_push_hc_data(hc06_ptr, &uh->dest, sizeof(uh->dest)); } else { pr_debug("UDP header: can't compress\n"); + /* compression value */ tmp = LOWPAN_NHC_UDP_CS_P_00; lowpan_push_hc_data(hc06_ptr, &tmp, sizeof(tmp)); + /* source port */ lowpan_push_hc_data(hc06_ptr, &uh->source, sizeof(uh->source)); + /* destination port */ lowpan_push_hc_data(hc06_ptr, &uh->dest, sizeof(uh->dest)); } |