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wifi: mac80211: add mesh fast-rx support

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This helps bring down rx CPU usage by avoiding calls to the rx handlers in
the slow path. Supports forwarding and local rx, including A-MSDU.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Link: https://lore.kernel.org/r/20230314095956.62085-6-nbd@nbd.name
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Felix Fietkau 2023-03-14 10:59:55 +01:00 committed by Johannes Berg
parent 8b0f5cb6bc
commit 3468e1e0c6
1 changed files with 29 additions and 5 deletions
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34
net/mac80211/rx.c
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@ -4542,6 +4542,12 @@ void ieee80211_check_fast_rx(struct sta_info *sta)
fastrx.internal_forward = 0;
}
break;
case NL80211_IFTYPE_MESH_POINT:
fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_FROMDS |
IEEE80211_FCTL_TODS);
fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3);
fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4);
break;
default:
goto clear;
@ -4751,6 +4757,7 @@ static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
struct sk_buff *skb = rx->skb;
struct ieee80211_hdr *hdr = (void *)skb->data;
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
static ieee80211_rx_result res;
int orig_len = skb->len;
int hdrlen = ieee80211_hdrlen(hdr->frame_control);
int snap_offs = hdrlen;
@ -4812,7 +4819,8 @@ static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
snap_offs += IEEE80211_CCMP_HDR_LEN;
}
if (!(status->rx_flags & IEEE80211_RX_AMSDU)) {
if (!ieee80211_vif_is_mesh(&rx->sdata->vif) &&
!(status->rx_flags & IEEE80211_RX_AMSDU)) {
if (!pskb_may_pull(skb, snap_offs + sizeof(*payload)))
return false;
@ -4851,13 +4859,29 @@ static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx,
/* 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);
skb_postpull_rcsum(skb, skb->data + snap_offs,
sizeof(rfc1042_header) + 2);
/* remove the SNAP but leave the ethertype */
skb_pull(skb, snap_offs + sizeof(rfc1042_header));
if (ieee80211_vif_is_mesh(&rx->sdata->vif)) {
skb_pull(skb, snap_offs - 2);
put_unaligned_be16(skb->len - 2, skb->data);
} else {
skb_postpull_rcsum(skb, skb->data + snap_offs,
sizeof(rfc1042_header) + 2);
/* remove the SNAP but leave the ethertype */
skb_pull(skb, snap_offs + sizeof(rfc1042_header));
}
/* push the addresses in front */
memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs));
res = ieee80211_rx_mesh_data(rx->sdata, rx->sta, rx->skb);
switch (res) {
case RX_QUEUED:
return true;
case RX_CONTINUE:
break;
default:
goto drop;
}
ieee80211_rx_8023(rx, fast_rx, orig_len);
return true;