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mac80211: avoid extra memcpy in A-MSDU head creation 

Signed-off-by: Michael Braun <michael-dev@fami-braun.de>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Michael Braun 2016-10-15 13:28:18 +02:00 committed by Johannes Berg
parent 4b82a004ec
commit 06f2bb1e01
1 changed files with 14 additions and 11 deletions
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25
net/mac80211/tx.c
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@ -3059,11 +3059,11 @@ static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata,
struct ieee80211_local *local = sdata->local;
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
struct ieee80211_hdr *hdr;
struct ethhdr amsdu_hdr;
struct ethhdr *amsdu_hdr;
int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header);
int subframe_len = skb->len - hdr_len;
void *data;
u8 *qc;
u8 *qc, *h_80211_src, *h_80211_dst;
if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)
return false;
@ -3071,19 +3071,22 @@ static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata,
if (info->control.flags & IEEE80211_TX_CTRL_AMSDU)
return true;
if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(amsdu_hdr),
if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(*amsdu_hdr),
&subframe_len))
return false;
amsdu_hdr.h_proto = cpu_to_be16(subframe_len);
memcpy(amsdu_hdr.h_source, skb->data + fast_tx->sa_offs, ETH_ALEN);
memcpy(amsdu_hdr.h_dest, skb->data + fast_tx->da_offs, ETH_ALEN);
data = skb_push(skb, sizeof(amsdu_hdr));
memmove(data, data + sizeof(amsdu_hdr), hdr_len);
memcpy(data + hdr_len, &amsdu_hdr, sizeof(amsdu_hdr));
data = skb_push(skb, sizeof(*amsdu_hdr));
memmove(data, data + sizeof(*amsdu_hdr), hdr_len);
hdr = data;
amsdu_hdr = data + hdr_len;
/* h_80211_src/dst is addr* field within hdr */
h_80211_src = data + fast_tx->sa_offs;
h_80211_dst = data + fast_tx->da_offs;
amsdu_hdr->h_proto = cpu_to_be16(subframe_len);
ether_addr_copy(amsdu_hdr->h_source, h_80211_src);
ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst);
qc = ieee80211_get_qos_ctl(hdr);
*qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT;