From: Felix Fietkau Date: Mon, 26 Feb 2018 21:13:44 +0000 (+0100) Subject: mac80211: add an optimization for fast-rx support X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=c4c64f5305199343e6fdb85c167b95170b0e12c1;p=librecmc%2Flibrecmc.git mac80211: add an optimization for fast-rx support Signed-off-by: Felix Fietkau --- diff --git a/package/kernel/mac80211/patches/335-mac80211-support-A-MSDU-in-fast-rx.patch b/package/kernel/mac80211/patches/335-mac80211-support-A-MSDU-in-fast-rx.patch new file mode 100644 index 0000000000..dce6d5c8f3 --- /dev/null +++ b/package/kernel/mac80211/patches/335-mac80211-support-A-MSDU-in-fast-rx.patch @@ -0,0 +1,207 @@ +From: Felix Fietkau +Date: Mon, 26 Feb 2018 22:09:29 +0100 +Subject: [PATCH] mac80211: support A-MSDU in fast-rx + +Only works if the IV was stripped from packets. Create a smaller +variant of ieee80211_rx_h_amsdu, which bypasses checks already done +within the fast-rx context. + +Signed-off-by: Felix Fietkau +--- + +--- a/net/mac80211/rx.c ++++ b/net/mac80211/rx.c +@@ -2358,39 +2358,17 @@ ieee80211_deliver_skb(struct ieee80211_r + } + + static ieee80211_rx_result debug_noinline +-ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) ++__ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) + { + struct net_device *dev = rx->sdata->dev; + struct sk_buff *skb = rx->skb; + struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; + __le16 fc = hdr->frame_control; + struct sk_buff_head frame_list; +- struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); + struct ethhdr ethhdr; + const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source; + +- if (unlikely(!ieee80211_is_data(fc))) +- return RX_CONTINUE; +- +- if (unlikely(!ieee80211_is_data_present(fc))) +- return RX_DROP_MONITOR; +- +- if (!(status->rx_flags & IEEE80211_RX_AMSDU)) +- return RX_CONTINUE; +- + if (unlikely(ieee80211_has_a4(hdr->frame_control))) { +- switch (rx->sdata->vif.type) { +- case NL80211_IFTYPE_AP_VLAN: +- if (!rx->sdata->u.vlan.sta) +- return RX_DROP_UNUSABLE; +- break; +- case NL80211_IFTYPE_STATION: +- if (!rx->sdata->u.mgd.use_4addr) +- return RX_DROP_UNUSABLE; +- break; +- default: +- return RX_DROP_UNUSABLE; +- } + check_da = NULL; + check_sa = NULL; + } else switch (rx->sdata->vif.type) { +@@ -2410,9 +2388,6 @@ ieee80211_rx_h_amsdu(struct ieee80211_rx + break; + } + +- if (is_multicast_ether_addr(hdr->addr1)) +- return RX_DROP_UNUSABLE; +- + skb->dev = dev; + __skb_queue_head_init(&frame_list); + +@@ -2440,6 +2415,44 @@ ieee80211_rx_h_amsdu(struct ieee80211_rx + return RX_QUEUED; + } + ++static ieee80211_rx_result debug_noinline ++ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) ++{ ++ struct sk_buff *skb = rx->skb; ++ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); ++ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; ++ __le16 fc = hdr->frame_control; ++ ++ if (!(status->rx_flags & IEEE80211_RX_AMSDU)) ++ return RX_CONTINUE; ++ ++ if (unlikely(!ieee80211_is_data(fc))) ++ return RX_CONTINUE; ++ ++ if (unlikely(!ieee80211_is_data_present(fc))) ++ return RX_DROP_MONITOR; ++ ++ if (unlikely(ieee80211_has_a4(hdr->frame_control))) { ++ switch (rx->sdata->vif.type) { ++ case NL80211_IFTYPE_AP_VLAN: ++ if (!rx->sdata->u.vlan.sta) ++ return RX_DROP_UNUSABLE; ++ break; ++ case NL80211_IFTYPE_STATION: ++ if (!rx->sdata->u.mgd.use_4addr) ++ return RX_DROP_UNUSABLE; ++ break; ++ default: ++ return RX_DROP_UNUSABLE; ++ } ++ } ++ ++ if (is_multicast_ether_addr(hdr->addr1)) ++ return RX_DROP_UNUSABLE; ++ ++ return __ieee80211_rx_h_amsdu(rx); ++} ++ + #ifdef CPTCFG_MAC80211_MESH + static ieee80211_rx_result + ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) +@@ -3899,6 +3912,7 @@ static bool ieee80211_invoke_fast_rx(str + u8 sa[ETH_ALEN]; + } addrs __aligned(2); + struct ieee80211_sta_rx_stats *stats = &sta->rx_stats; ++ int res; + + if (fast_rx->uses_rss) + stats = this_cpu_ptr(sta->pcpu_rx_stats); +@@ -3920,10 +3934,6 @@ static bool ieee80211_invoke_fast_rx(str + (status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS) + return false; + +- /* we don't deal with A-MSDU deaggregation here */ +- if (status->rx_flags & IEEE80211_RX_AMSDU) +- return false; +- + if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) + return false; + +@@ -3951,25 +3961,31 @@ static bool ieee80211_invoke_fast_rx(str + * and strip the IV/MIC if necessary + */ + if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) { ++ if (status->rx_flags & IEEE80211_RX_AMSDU) ++ return false; ++ + /* GCMP header length is the same */ + snap_offs += IEEE80211_CCMP_HDR_LEN; + } + +- if (!pskb_may_pull(skb, snap_offs + sizeof(*payload))) +- goto drop; +- payload = (void *)(skb->data + snap_offs); ++ if (!(status->rx_flags & IEEE80211_RX_AMSDU)) { ++ if (!pskb_may_pull(skb, snap_offs + sizeof(*payload))) ++ goto drop; + +- if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr)) +- return false; ++ payload = (void *)(skb->data + snap_offs); + +- /* Don't handle these here since they require special code. +- * Accept AARP and IPX even though they should come with a +- * bridge-tunnel header - but if we get them this way then +- * there's little point in discarding them. +- */ +- if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) || +- payload->proto == fast_rx->control_port_protocol)) +- return false; ++ if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr)) ++ return false; ++ ++ /* Don't handle these here since they require special code. ++ * Accept AARP and IPX even though they should come with a ++ * bridge-tunnel header - but if we get them this way then ++ * there's little point in discarding them. ++ */ ++ if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) || ++ payload->proto == fast_rx->control_port_protocol)) ++ return false; ++ } + + /* after this point, don't punt to the slowpath! */ + +@@ -3983,12 +3999,6 @@ static bool ieee80211_invoke_fast_rx(str + } + + /* statistics part of ieee80211_rx_h_sta_process() */ +- stats->last_rx = jiffies; +- stats->last_rate = sta_stats_encode_rate(status); +- +- stats->fragments++; +- stats->packets++; +- + if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) { + stats->last_signal = status->signal; + if (!fast_rx->uses_rss) +@@ -4017,6 +4027,20 @@ static bool ieee80211_invoke_fast_rx(str + if (rx->key && !ieee80211_has_protected(hdr->frame_control)) + goto drop; + ++ if (status->rx_flags & IEEE80211_RX_AMSDU) { ++ res = __ieee80211_rx_h_amsdu(rx); ++ if (res != RX_QUEUED) ++ goto drop; ++ ++ return true; ++ } ++ ++ stats->last_rx = jiffies; ++ stats->last_rate = sta_stats_encode_rate(status); ++ ++ stats->fragments++; ++ stats->packets++; ++ + /* do the header conversion - first grab the addresses */ + ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs); + ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);