diff options
Diffstat (limited to 'package/kernel/mac80211/patches/319-mac80211-avoid-extra-memcpy-in-A-MSDU-head-creation.patch')
| -rw-r--r-- | package/kernel/mac80211/patches/319-mac80211-avoid-extra-memcpy-in-A-MSDU-head-creation.patch | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/package/kernel/mac80211/patches/319-mac80211-avoid-extra-memcpy-in-A-MSDU-head-creation.patch b/package/kernel/mac80211/patches/319-mac80211-avoid-extra-memcpy-in-A-MSDU-head-creation.patch new file mode 100644 index 0000000000..fb6bd30243 --- /dev/null +++ b/package/kernel/mac80211/patches/319-mac80211-avoid-extra-memcpy-in-A-MSDU-head-creation.patch @@ -0,0 +1,55 @@ +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; + |