mirror of https://github.com/hak5/openwrt-owl.git
mac80211: add an optimization for fast-rx support
Signed-off-by: Felix Fietkau <nbd@nbd.name>openwrt-18.06
Felix Fietkau
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916e33fa1e
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c4c64f5305
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From: Felix Fietkau <nbd@nbd.name>
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Date: Mon, 26 Feb 2018 22:09:29 +0100
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Subject: [PATCH] mac80211: support A-MSDU in fast-rx
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Only works if the IV was stripped from packets. Create a smaller
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variant of ieee80211_rx_h_amsdu, which bypasses checks already done
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within the fast-rx context.
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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---
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--- a/net/mac80211/rx.c
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+++ b/net/mac80211/rx.c
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@@ -2358,39 +2358,17 @@ ieee80211_deliver_skb(struct ieee80211_r
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}
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static ieee80211_rx_result debug_noinline
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-ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
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+__ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
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{
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struct net_device *dev = rx->sdata->dev;
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struct sk_buff *skb = rx->skb;
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
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__le16 fc = hdr->frame_control;
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struct sk_buff_head frame_list;
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- struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
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struct ethhdr ethhdr;
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const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source;
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- if (unlikely(!ieee80211_is_data(fc)))
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- return RX_CONTINUE;
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-
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- if (unlikely(!ieee80211_is_data_present(fc)))
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- return RX_DROP_MONITOR;
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-
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- if (!(status->rx_flags & IEEE80211_RX_AMSDU))
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- return RX_CONTINUE;
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-
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if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
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- switch (rx->sdata->vif.type) {
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- case NL80211_IFTYPE_AP_VLAN:
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- if (!rx->sdata->u.vlan.sta)
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- return RX_DROP_UNUSABLE;
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- break;
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- case NL80211_IFTYPE_STATION:
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- if (!rx->sdata->u.mgd.use_4addr)
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- return RX_DROP_UNUSABLE;
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- break;
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- default:
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- return RX_DROP_UNUSABLE;
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- }
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check_da = NULL;
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check_sa = NULL;
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} else switch (rx->sdata->vif.type) {
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@@ -2410,9 +2388,6 @@ ieee80211_rx_h_amsdu(struct ieee80211_rx
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break;
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}
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- if (is_multicast_ether_addr(hdr->addr1))
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- return RX_DROP_UNUSABLE;
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-
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skb->dev = dev;
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__skb_queue_head_init(&frame_list);
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@@ -2440,6 +2415,44 @@ ieee80211_rx_h_amsdu(struct ieee80211_rx
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return RX_QUEUED;
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}
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+static ieee80211_rx_result debug_noinline
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+ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
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+{
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+ struct sk_buff *skb = rx->skb;
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+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
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+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
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+ __le16 fc = hdr->frame_control;
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+
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+ if (!(status->rx_flags & IEEE80211_RX_AMSDU))
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+ return RX_CONTINUE;
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+
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+ if (unlikely(!ieee80211_is_data(fc)))
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+ return RX_CONTINUE;
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+
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+ if (unlikely(!ieee80211_is_data_present(fc)))
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+ return RX_DROP_MONITOR;
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+
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+ if (unlikely(ieee80211_has_a4(hdr->frame_control))) {
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+ switch (rx->sdata->vif.type) {
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+ case NL80211_IFTYPE_AP_VLAN:
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+ if (!rx->sdata->u.vlan.sta)
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+ return RX_DROP_UNUSABLE;
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+ break;
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+ case NL80211_IFTYPE_STATION:
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+ if (!rx->sdata->u.mgd.use_4addr)
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+ return RX_DROP_UNUSABLE;
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+ break;
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+ default:
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+ return RX_DROP_UNUSABLE;
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+ }
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+ }
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+
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+ if (is_multicast_ether_addr(hdr->addr1))
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+ return RX_DROP_UNUSABLE;
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+
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+ return __ieee80211_rx_h_amsdu(rx);
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+}
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+
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#ifdef CPTCFG_MAC80211_MESH
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static ieee80211_rx_result
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ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
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@@ -3899,6 +3912,7 @@ static bool ieee80211_invoke_fast_rx(str
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u8 sa[ETH_ALEN];
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} addrs __aligned(2);
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struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
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+ int res;
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if (fast_rx->uses_rss)
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stats = this_cpu_ptr(sta->pcpu_rx_stats);
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@@ -3920,10 +3934,6 @@ static bool ieee80211_invoke_fast_rx(str
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(status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS)
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return false;
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- /* we don't deal with A-MSDU deaggregation here */
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- if (status->rx_flags & IEEE80211_RX_AMSDU)
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- return false;
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-
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if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
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return false;
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@@ -3951,25 +3961,31 @@ static bool ieee80211_invoke_fast_rx(str
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* and strip the IV/MIC if necessary
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*/
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if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) {
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+ if (status->rx_flags & IEEE80211_RX_AMSDU)
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+ return false;
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+
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/* GCMP header length is the same */
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snap_offs += IEEE80211_CCMP_HDR_LEN;
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}
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- if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
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- goto drop;
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- payload = (void *)(skb->data + snap_offs);
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+ if (!(status->rx_flags & IEEE80211_RX_AMSDU)) {
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+ if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
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+ goto drop;
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- if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
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- return false;
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+ payload = (void *)(skb->data + snap_offs);
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- /* Don't handle these here since they require special code.
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- * Accept AARP and IPX even though they should come with a
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- * bridge-tunnel header - but if we get them this way then
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- * there's little point in discarding them.
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- */
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- if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
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- payload->proto == fast_rx->control_port_protocol))
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- return false;
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+ if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr))
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+ return false;
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+
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+ /* Don't handle these here since they require special code.
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+ * Accept AARP and IPX even though they should come with a
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+ * bridge-tunnel header - but if we get them this way then
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+ * there's little point in discarding them.
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+ */
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+ if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) ||
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+ payload->proto == fast_rx->control_port_protocol))
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+ return false;
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+ }
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/* after this point, don't punt to the slowpath! */
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@@ -3983,12 +3999,6 @@ static bool ieee80211_invoke_fast_rx(str
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}
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/* statistics part of ieee80211_rx_h_sta_process() */
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- stats->last_rx = jiffies;
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- stats->last_rate = sta_stats_encode_rate(status);
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-
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- stats->fragments++;
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- stats->packets++;
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-
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if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
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stats->last_signal = status->signal;
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if (!fast_rx->uses_rss)
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@@ -4017,6 +4027,20 @@ static bool ieee80211_invoke_fast_rx(str
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if (rx->key && !ieee80211_has_protected(hdr->frame_control))
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goto drop;
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+ if (status->rx_flags & IEEE80211_RX_AMSDU) {
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+ res = __ieee80211_rx_h_amsdu(rx);
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+ if (res != RX_QUEUED)
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+ goto drop;
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+
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+ return true;
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+ }
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+
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+ stats->last_rx = jiffies;
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+ stats->last_rate = sta_stats_encode_rate(status);
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+
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+ stats->fragments++;
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+ stats->packets++;
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+
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/* do the header conversion - first grab the addresses */
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ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs);
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ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs);
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