55 lines
1.9 KiB
Diff
55 lines
1.9 KiB
Diff
From: Michael Braun <michael-dev@fami-braun.de>
|
|
Date: Sat, 15 Oct 2016 13:28:18 +0200
|
|
Subject: [PATCH] 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>
|
|
---
|
|
|
|
--- a/net/mac80211/tx.c
|
|
+++ b/net/mac80211/tx.c
|
|
@@ -3069,11 +3069,11 @@ static bool ieee80211_amsdu_prepare_head
|
|
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;
|
|
@@ -3081,19 +3081,22 @@ static bool ieee80211_amsdu_prepare_head
|
|
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);
|
|
+ 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;
|
|
|
|
- data = skb_push(skb, sizeof(amsdu_hdr));
|
|
- memmove(data, data + sizeof(amsdu_hdr), hdr_len);
|
|
- memcpy(data + hdr_len, &amsdu_hdr, sizeof(amsdu_hdr));
|
|
+ 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);
|
|
|
|
- hdr = data;
|
|
qc = ieee80211_get_qos_ctl(hdr);
|
|
*qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT;
|
|
|