Date: Fri, 21 Jun 2024 15:51:56 +0800
From: David Lin <yu-hao.lin@....com>
To: linux-wireless@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	briannorris@...omium.org,
	kvalo@...nel.org,
	francesco@...cini.it,
	tsung-hsien.hsieh@....com,
	David Lin <yu-hao.lin@....com>
Subject: [PATCH 31/43] wifi: nxpwifi: add sta_rx.c

Signed-off-by: David Lin <yu-hao.lin@....com>
---
 drivers/net/wireless/nxp/nxpwifi/sta_rx.c | 244 ++++++++++++++++++++++
 1 file changed, 244 insertions(+)
 create mode 100644 drivers/net/wireless/nxp/nxpwifi/sta_rx.c

diff --git a/drivers/net/wireless/nxp/nxpwifi/sta_rx.c b/drivers/net/wireless/nxp/nxpwifi/sta_rx.c
new file mode 100644
index 000000000000..9309ac510ac5
--- /dev/null
+++ b/drivers/net/wireless/nxp/nxpwifi/sta_rx.c
@@ -0,0 +1,244 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * NXP Wireless LAN device driver: station RX data handling
+ *
+ * Copyright 2011-2024 NXP
+ */
+
+#include <uapi/linux/ipv6.h>
+#include <net/ndisc.h>
+#include "decl.h"
+#include "ioctl.h"
+#include "util.h"
+#include "fw.h"
+#include "main.h"
+#include "11n_aggr.h"
+#include "11n_rxreorder.h"
+
+/* This function checks if a frame is IPv4 ARP or IPv6 Neighbour advertisement
+ * frame. If frame has both source and destination mac address as same, this
+ * function drops such gratuitous frames.
+ */
+static bool
+nxpwifi_discard_gratuitous_arp(struct nxpwifi_private *priv,
+			       struct sk_buff *skb)
+{
+	const struct nxpwifi_arp_eth_header *arp;
+	struct ethhdr *eth;
+	struct ipv6hdr *ipv6;
+	struct icmp6hdr *icmpv6;
+
+	eth = (struct ethhdr *)skb->data;
+	switch (ntohs(eth->h_proto)) {
+	case ETH_P_ARP:
+		arp = (void *)(skb->data + sizeof(struct ethhdr));
+		if (arp->hdr.ar_op == htons(ARPOP_REPLY) ||
+		    arp->hdr.ar_op == htons(ARPOP_REQUEST)) {
+			if (!memcmp(arp->ar_sip, arp->ar_tip, 4))
+				return true;
+		}
+		break;
+	case ETH_P_IPV6:
+		ipv6 = (void *)(skb->data + sizeof(struct ethhdr));
+		icmpv6 = (void *)(skb->data + sizeof(struct ethhdr) +
+				  sizeof(struct ipv6hdr));
+		if (icmpv6->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT) {
+			if (!memcmp(&ipv6->saddr, &ipv6->daddr,
+				    sizeof(struct in6_addr)))
+				return true;
+		}
+		break;
+	default:
+		break;
+	}
+
+	return false;
+}
+
+/* This function processes the received packet and forwards it
+ * to kernel/upper layer.
+ *
+ * This function parses through the received packet and determines
+ * if it is a debug packet or normal packet.
+ *
+ * For non-debug packets, the function chops off unnecessary leading
+ * header bytes, reconstructs the packet as an ethernet frame or
+ * 802.2/llc/snap frame as required, and sends it to kernel/upper layer.
+ *
+ * The completion callback is called after processing in complete.
+ */
+int nxpwifi_process_rx_packet(struct nxpwifi_private *priv,
+			      struct sk_buff *skb)
+{
+	int ret;
+	struct rx_packet_hdr *rx_pkt_hdr;
+	struct rxpd *local_rx_pd;
+	int hdr_chop;
+	struct ethhdr *eth;
+	u16 rx_pkt_off, rx_pkt_len;
+	u8 adj_rx_rate = 0;
+
+	local_rx_pd = (struct rxpd *)(skb->data);
+
+	rx_pkt_off = le16_to_cpu(local_rx_pd->rx_pkt_offset);
+	rx_pkt_len = le16_to_cpu(local_rx_pd->rx_pkt_length);
+	rx_pkt_hdr = (void *)local_rx_pd + rx_pkt_off;
+
+	if (sizeof(rx_pkt_hdr->eth803_hdr) + sizeof(rfc1042_header) +
+	    rx_pkt_off > skb->len) {
+		priv->stats.rx_dropped++;
+		dev_kfree_skb_any(skb);
+		return -1;
+	}
+
+	if (sizeof(*rx_pkt_hdr) + rx_pkt_off <= skb->len &&
+	    ((!memcmp(&rx_pkt_hdr->rfc1042_hdr, bridge_tunnel_header,
+		      sizeof(bridge_tunnel_header))) ||
+	     (!memcmp(&rx_pkt_hdr->rfc1042_hdr, rfc1042_header,
+		      sizeof(rfc1042_header)) &&
+	      rx_pkt_hdr->rfc1042_hdr.snap_type != htons(ETH_P_AARP) &&
+	      rx_pkt_hdr->rfc1042_hdr.snap_type != htons(ETH_P_IPX)))) {
+		/*  Replace the 803 header and rfc1042 header (llc/snap) with an
+		 *    EthernetII header, keep the src/dst and snap_type
+		 *    (ethertype).
+		 *  The firmware only passes up SNAP frames converting
+		 *    all RX Data from 802.11 to 802.2/LLC/SNAP frames.
+		 *  To create the Ethernet II, just move the src, dst address
+		 *    right before the snap_type.
+		 */
+		eth = (struct ethhdr *)
+			((u8 *)&rx_pkt_hdr->eth803_hdr
+			 + sizeof(rx_pkt_hdr->eth803_hdr) +
+			 sizeof(rx_pkt_hdr->rfc1042_hdr)
+			 - sizeof(rx_pkt_hdr->eth803_hdr.h_dest)
+			 - sizeof(rx_pkt_hdr->eth803_hdr.h_source)
+			 - sizeof(rx_pkt_hdr->rfc1042_hdr.snap_type));
+
+		memcpy(eth->h_source, rx_pkt_hdr->eth803_hdr.h_source,
+		       sizeof(eth->h_source));
+		memcpy(eth->h_dest, rx_pkt_hdr->eth803_hdr.h_dest,
+		       sizeof(eth->h_dest));
+
+		/* Chop off the rxpd + the excess memory from the 802.2/llc/snap
+		 * header that was removed.
+		 */
+		hdr_chop = (u8 *)eth - (u8 *)local_rx_pd;
+	} else {
+		/* Chop off the rxpd */
+		hdr_chop = (u8 *)&rx_pkt_hdr->eth803_hdr - (u8 *)local_rx_pd;
+	}
+
+	/* Chop off the leading header bytes so the it points to the start of
+	 * either the reconstructed EthII frame or the 802.2/llc/snap frame
+	 */
+	skb_pull(skb, hdr_chop);
+
+	if (priv->hs2_enabled &&
+	    nxpwifi_discard_gratuitous_arp(priv, skb)) {
+		nxpwifi_dbg(priv->adapter, INFO, "Bypassed Gratuitous ARP\n");
+		dev_kfree_skb_any(skb);
+		return 0;
+	}
+
+	/* Only stash RX bitrate for unicast packets. */
+	if (likely(!is_multicast_ether_addr(rx_pkt_hdr->eth803_hdr.h_dest))) {
+		priv->rxpd_rate = local_rx_pd->rx_rate;
+		priv->rxpd_htinfo = local_rx_pd->ht_info;
+	}
+
+	if (GET_BSS_ROLE(priv) == NXPWIFI_BSS_ROLE_STA ||
+	    GET_BSS_ROLE(priv) == NXPWIFI_BSS_ROLE_UAP) {
+		adj_rx_rate = nxpwifi_adjust_data_rate(priv,
+						       local_rx_pd->rx_rate,
+						       local_rx_pd->ht_info);
+		nxpwifi_hist_data_add(priv, adj_rx_rate, local_rx_pd->snr,
+				      local_rx_pd->nf);
+	}
+
+	ret = nxpwifi_recv_packet(priv, skb);
+	if (ret == -1)
+		nxpwifi_dbg(priv->adapter, ERROR,
+			    "recv packet failed\n");
+
+	return ret;
+}
+
+/* This function processes the received buffer.
+ *
+ * The function looks into the RxPD and performs sanity tests on the
+ * received buffer to ensure its a valid packet, before processing it
+ * further. If the packet is determined to be aggregated, it is
+ * de-aggregated accordingly. Non-unicast packets are sent directly to
+ * the kernel/upper layers. Unicast packets are handed over to the
+ * Rx reordering routine if 11n is enabled.
+ *
+ * The completion callback is called after processing in complete.
+ */
+int nxpwifi_process_sta_rx_packet(struct nxpwifi_private *priv,
+				  struct sk_buff *skb)
+{
+	struct nxpwifi_adapter *adapter = priv->adapter;
+	int ret = 0;
+	struct rxpd *local_rx_pd;
+	struct rx_packet_hdr *rx_pkt_hdr;
+	u8 ta[ETH_ALEN];
+	u16 rx_pkt_type, rx_pkt_offset, rx_pkt_length, seq_num;
+
+	local_rx_pd = (struct rxpd *)(skb->data);
+	rx_pkt_type = le16_to_cpu(local_rx_pd->rx_pkt_type);
+	rx_pkt_offset = le16_to_cpu(local_rx_pd->rx_pkt_offset);
+	rx_pkt_length = le16_to_cpu(local_rx_pd->rx_pkt_length);
+	seq_num = le16_to_cpu(local_rx_pd->seq_num);
+
+	rx_pkt_hdr = (void *)local_rx_pd + rx_pkt_offset;
+
+	if ((rx_pkt_offset + rx_pkt_length) > skb->len ||
+	    sizeof(rx_pkt_hdr->eth803_hdr) + rx_pkt_offset > skb->len) {
+		nxpwifi_dbg(adapter, ERROR,
+			    "wrong rx packet: len=%d, rx_pkt_offset=%d, rx_pkt_length=%d\n",
+			    skb->len, rx_pkt_offset, rx_pkt_length);
+		priv->stats.rx_dropped++;
+		dev_kfree_skb_any(skb);
+		return ret;
+	}
+
+	if (rx_pkt_type == PKT_TYPE_MGMT) {
+		ret = nxpwifi_process_mgmt_packet(priv, skb);
+		if (ret)
+			nxpwifi_dbg(adapter, DATA, "Rx of mgmt packet failed");
+		dev_kfree_skb_any(skb);
+		return ret;
+	}
+
+	/* If the packet is not an unicast packet then send the packet
+	 * directly to os. Don't pass thru rx reordering
+	 */
+	if (!IS_11N_ENABLED(priv) ||
+	    !ether_addr_equal_unaligned(priv->curr_addr,
+					rx_pkt_hdr->eth803_hdr.h_dest)) {
+		nxpwifi_process_rx_packet(priv, skb);
+		return ret;
+	}
+
+	if (nxpwifi_queuing_ra_based(priv)) {
+		memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN);
+	} else {
+		if (rx_pkt_type != PKT_TYPE_BAR &&
+		    local_rx_pd->priority < MAX_NUM_TID)
+			priv->rx_seq[local_rx_pd->priority] = seq_num;
+		memcpy(ta, priv->curr_bss_params.bss_descriptor.mac_address,
+		       ETH_ALEN);
+	}
+
+	/* Reorder and send to OS */
+	ret = nxpwifi_11n_rx_reorder_pkt(priv, seq_num, local_rx_pd->priority,
+					 ta, (u8)rx_pkt_type, skb);
+
+	if (ret || rx_pkt_type == PKT_TYPE_BAR)
+		dev_kfree_skb_any(skb);
+
+	if (ret)
+		priv->stats.rx_dropped++;
+
+	return ret;
+}
-- 
2.34.1

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