mwifiex: Add support for auto ARP in mwifiex.

This patch adds support for auto ARP feature in mwifiex.
The device will respond to ARP requests from the network
with ARP response in suspended state without waking up the host.
This feature is enabled in the driver by default.

Signed-off-by: Maithili Hinge <maithili@marvell.com>
Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

1 files changed, 96 insertions, 24 deletions

diff --git a/drivers/net/wireless/mwifiex/cfg80211.c b/drivers/net/wireless/mwifiex/cfg80211.c
index 8e1f681f960b..b0778a699bbc 100644
--- a/drivers/net/wireless/mwifiex/cfg80211.c
+++ b/drivers/net/wireless/mwifiex/cfg80211.c
@@ -2732,24 +2732,71 @@ mwifiex_is_pattern_supported(struct cfg80211_pkt_pattern *pat, s8 *byte_seq,
 }
 
 #ifdef CONFIG_PM
-static int mwifiex_set_mef_filter(struct mwifiex_private *priv,
-				  struct cfg80211_wowlan *wowlan)
+static void mwifiex_set_auto_arp_mef_entry(struct mwifiex_private *priv,
+					   struct mwifiex_mef_entry *mef_entry)
+{
+	int i, filt_num = 0, num_ipv4 = 0;
+	struct in_device *in_dev;
+	struct in_ifaddr *ifa;
+	__be32 ips[MWIFIEX_MAX_SUPPORTED_IPADDR];
+	struct mwifiex_adapter *adapter = priv->adapter;
+
+	mef_entry->mode = MEF_MODE_HOST_SLEEP;
+	mef_entry->action = MEF_ACTION_AUTO_ARP;
+
+	/* Enable ARP offload feature */
+	memset(ips, 0, sizeof(ips));
+	for (i = 0; i < MWIFIEX_MAX_BSS_NUM; i++) {
+		if (adapter->priv[i]->netdev) {
+			in_dev = __in_dev_get_rtnl(adapter->priv[i]->netdev);
+			if (!in_dev)
+				continue;
+			ifa = in_dev->ifa_list;
+			if (!ifa || !ifa->ifa_local)
+				continue;
+			ips[i] = ifa->ifa_local;
+			num_ipv4++;
+		}
+	}
+
+	for (i = 0; i < num_ipv4; i++) {
+		if (!ips[i])
+			continue;
+		mef_entry->filter[filt_num].repeat = 1;
+		memcpy(mef_entry->filter[filt_num].byte_seq,
+		       (u8 *)&ips[i], sizeof(ips[i]));
+		mef_entry->filter[filt_num].
+			byte_seq[MWIFIEX_MEF_MAX_BYTESEQ] =
+			sizeof(ips[i]);
+		mef_entry->filter[filt_num].offset = 46;
+		mef_entry->filter[filt_num].filt_type = TYPE_EQ;
+		if (filt_num) {
+			mef_entry->filter[filt_num].filt_action =
+				TYPE_OR;
+		}
+		filt_num++;
+	}
+
+	mef_entry->filter[filt_num].repeat = 1;
+	mef_entry->filter[filt_num].byte_seq[0] = 0x08;
+	mef_entry->filter[filt_num].byte_seq[1] = 0x06;
+	mef_entry->filter[filt_num].byte_seq[MWIFIEX_MEF_MAX_BYTESEQ] = 2;
+	mef_entry->filter[filt_num].offset = 20;
+	mef_entry->filter[filt_num].filt_type = TYPE_EQ;
+	mef_entry->filter[filt_num].filt_action = TYPE_AND;
+}
+
+static int mwifiex_set_wowlan_mef_entry(struct mwifiex_private *priv,
+					struct mwifiex_ds_mef_cfg *mef_cfg,
+					struct mwifiex_mef_entry *mef_entry,
+					struct cfg80211_wowlan *wowlan)
 {
 	int i, filt_num = 0, ret = 0;
 	bool first_pat = true;
 	u8 byte_seq[MWIFIEX_MEF_MAX_BYTESEQ + 1];
 	const u8 ipv4_mc_mac[] = {0x33, 0x33};
 	const u8 ipv6_mc_mac[] = {0x01, 0x00, 0x5e};
-	struct mwifiex_ds_mef_cfg mef_cfg;
-	struct mwifiex_mef_entry *mef_entry;
-
-	mef_entry = kzalloc(sizeof(*mef_entry), GFP_KERNEL);
-	if (!mef_entry)
-		return -ENOMEM;
 
-	memset(&mef_cfg, 0, sizeof(mef_cfg));
-	mef_cfg.num_entries = 1;
-	mef_cfg.mef_entry = mef_entry;
 	mef_entry->mode = MEF_MODE_HOST_SLEEP;
 	mef_entry->action = MEF_ACTION_ALLOW_AND_WAKEUP_HOST;
 
@@ -2766,20 +2813,19 @@ static int mwifiex_set_mef_filter(struct mwifiex_private *priv,
 		if (!wowlan->patterns[i].pkt_offset) {
 			if (!(byte_seq[0] & 0x01) &&
 			    (byte_seq[MWIFIEX_MEF_MAX_BYTESEQ] == 1)) {
-				mef_cfg.criteria |= MWIFIEX_CRITERIA_UNICAST;
+				mef_cfg->criteria |= MWIFIEX_CRITERIA_UNICAST;
 				continue;
 			} else if (is_broadcast_ether_addr(byte_seq)) {
-				mef_cfg.criteria |= MWIFIEX_CRITERIA_BROADCAST;
+				mef_cfg->criteria |= MWIFIEX_CRITERIA_BROADCAST;
 				continue;
 			} else if ((!memcmp(byte_seq, ipv4_mc_mac, 2) &&
 				    (byte_seq[MWIFIEX_MEF_MAX_BYTESEQ] == 2)) ||
 				   (!memcmp(byte_seq, ipv6_mc_mac, 3) &&
 				    (byte_seq[MWIFIEX_MEF_MAX_BYTESEQ] == 3))) {
-				mef_cfg.criteria |= MWIFIEX_CRITERIA_MULTICAST;
+				mef_cfg->criteria |= MWIFIEX_CRITERIA_MULTICAST;
 				continue;
 			}
 		}
-
 		mef_entry->filter[filt_num].repeat = 1;
 		mef_entry->filter[filt_num].offset =
 			wowlan->patterns[i].pkt_offset;
@@ -2796,7 +2842,7 @@ static int mwifiex_set_mef_filter(struct mwifiex_private *priv,
 	}
 
 	if (wowlan->magic_pkt) {
-		mef_cfg.criteria |= MWIFIEX_CRITERIA_UNICAST;
+		mef_cfg->criteria |= MWIFIEX_CRITERIA_UNICAST;
 		mef_entry->filter[filt_num].repeat = 16;
 		memcpy(mef_entry->filter[filt_num].byte_seq, priv->curr_addr,
 				ETH_ALEN);
@@ -2817,6 +2863,34 @@ static int mwifiex_set_mef_filter(struct mwifiex_private *priv,
 		mef_entry->filter[filt_num].filt_type = TYPE_EQ;
 		mef_entry->filter[filt_num].filt_action = TYPE_OR;
 	}
+	return ret;
+}
+
+static int mwifiex_set_mef_filter(struct mwifiex_private *priv,
+				  struct cfg80211_wowlan *wowlan)
+{
+	int ret = 0, num_entries = 1;
+	struct mwifiex_ds_mef_cfg mef_cfg;
+	struct mwifiex_mef_entry *mef_entry;
+
+	if (wowlan->n_patterns || wowlan->magic_pkt)
+		num_entries++;
+
+	mef_entry = kcalloc(num_entries, sizeof(*mef_entry), GFP_KERNEL);
+	if (!mef_entry)
+		return -ENOMEM;
+
+	memset(&mef_cfg, 0, sizeof(mef_cfg));
+	mef_cfg.criteria |= MWIFIEX_CRITERIA_BROADCAST |
+		MWIFIEX_CRITERIA_UNICAST;
+	mef_cfg.num_entries = num_entries;
+	mef_cfg.mef_entry = mef_entry;
+
+	mwifiex_set_auto_arp_mef_entry(priv, &mef_entry[0]);
+
+	if (wowlan->n_patterns || wowlan->magic_pkt)
+		ret = mwifiex_set_wowlan_mef_entry(priv, &mef_cfg,
+						   &mef_entry[1], wowlan);
 
 	if (!mef_cfg.criteria)
 		mef_cfg.criteria = MWIFIEX_CRITERIA_BROADCAST |
@@ -2824,8 +2898,8 @@ static int mwifiex_set_mef_filter(struct mwifiex_private *priv,
 			MWIFIEX_CRITERIA_MULTICAST;
 
 	ret = mwifiex_send_cmd(priv, HostCmd_CMD_MEF_CFG,
-			HostCmd_ACT_GEN_SET, 0, &mef_cfg, true);
-
+			HostCmd_ACT_GEN_SET, 0,
+			&mef_cfg, true);
 	kfree(mef_entry);
 	return ret;
 }
@@ -2850,12 +2924,10 @@ static int mwifiex_cfg80211_suspend(struct wiphy *wiphy,
 		return 0;
 	}
 
-	if (wowlan->n_patterns || wowlan->magic_pkt) {
-		ret = mwifiex_set_mef_filter(priv, wowlan);
-		if (ret) {
-			dev_err(adapter->dev, "Failed to set MEF filter\n");
-			return ret;
-		}
+	ret = mwifiex_set_mef_filter(priv, wowlan);
+	if (ret) {
+		dev_err(adapter->dev, "Failed to set MEF filter\n");
+		return ret;
 	}
 
 	if (wowlan->disconnect) {