[PATCH 05/11] iwlwifi: mvm: remove TCP wakeup support

[Luca Coelho <luca@coelho.fi>]

From: Johannes Berg <johannes.berg@intel.com>

This feature was actually removed from firmware, but without
ever telling the driver. Since nobody is actually using it,
just remove it entirely without bothering with a capability
check.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
---
 drivers/net/wireless/intel/iwlwifi/mvm/d3.c       | 232 +---------------------
 drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c |  24 ---
 2 files changed, 1 insertion(+), 255 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/d3.c b/drivers/net/wireless/intel/iwlwifi/mvm/d3.c
index b1f73dcabd31..0e6cf39285f4 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/d3.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/d3.c
@@ -429,231 +429,6 @@ static int iwl_mvm_send_patterns(struct iwl_mvm *mvm,
 	return err;
 }
 
-enum iwl_mvm_tcp_packet_type {
-	MVM_TCP_TX_SYN,
-	MVM_TCP_RX_SYNACK,
-	MVM_TCP_TX_DATA,
-	MVM_TCP_RX_ACK,
-	MVM_TCP_RX_WAKE,
-	MVM_TCP_TX_FIN,
-};
-
-static __le16 pseudo_hdr_check(int len, __be32 saddr, __be32 daddr)
-{
-	__sum16 check = tcp_v4_check(len, saddr, daddr, 0);
-	return cpu_to_le16(be16_to_cpu((__force __be16)check));
-}
-
-static void iwl_mvm_build_tcp_packet(struct ieee80211_vif *vif,
-				     struct cfg80211_wowlan_tcp *tcp,
-				     void *_pkt, u8 *mask,
-				     __le16 *pseudo_hdr_csum,
-				     enum iwl_mvm_tcp_packet_type ptype)
-{
-	struct {
-		struct ethhdr eth;
-		struct iphdr ip;
-		struct tcphdr tcp;
-		u8 data[];
-	} __packed *pkt = _pkt;
-	u16 ip_tot_len = sizeof(struct iphdr) + sizeof(struct tcphdr);
-	int i;
-
-	pkt->eth.h_proto = cpu_to_be16(ETH_P_IP),
-	pkt->ip.version = 4;
-	pkt->ip.ihl = 5;
-	pkt->ip.protocol = IPPROTO_TCP;
-
-	switch (ptype) {
-	case MVM_TCP_TX_SYN:
-	case MVM_TCP_TX_DATA:
-	case MVM_TCP_TX_FIN:
-		memcpy(pkt->eth.h_dest, tcp->dst_mac, ETH_ALEN);
-		memcpy(pkt->eth.h_source, vif->addr, ETH_ALEN);
-		pkt->ip.ttl = 128;
-		pkt->ip.saddr = tcp->src;
-		pkt->ip.daddr = tcp->dst;
-		pkt->tcp.source = cpu_to_be16(tcp->src_port);
-		pkt->tcp.dest = cpu_to_be16(tcp->dst_port);
-		/* overwritten for TX SYN later */
-		pkt->tcp.doff = sizeof(struct tcphdr) / 4;
-		pkt->tcp.window = cpu_to_be16(65000);
-		break;
-	case MVM_TCP_RX_SYNACK:
-	case MVM_TCP_RX_ACK:
-	case MVM_TCP_RX_WAKE:
-		memcpy(pkt->eth.h_dest, vif->addr, ETH_ALEN);
-		memcpy(pkt->eth.h_source, tcp->dst_mac, ETH_ALEN);
-		pkt->ip.saddr = tcp->dst;
-		pkt->ip.daddr = tcp->src;
-		pkt->tcp.source = cpu_to_be16(tcp->dst_port);
-		pkt->tcp.dest = cpu_to_be16(tcp->src_port);
-		break;
-	default:
-		WARN_ON(1);
-		return;
-	}
-
-	switch (ptype) {
-	case MVM_TCP_TX_SYN:
-		/* firmware assumes 8 option bytes - 8 NOPs for now */
-		memset(pkt->data, 0x01, 8);
-		ip_tot_len += 8;
-		pkt->tcp.doff = (sizeof(struct tcphdr) + 8) / 4;
-		pkt->tcp.syn = 1;
-		break;
-	case MVM_TCP_TX_DATA:
-		ip_tot_len += tcp->payload_len;
-		memcpy(pkt->data, tcp->payload, tcp->payload_len);
-		pkt->tcp.psh = 1;
-		pkt->tcp.ack = 1;
-		break;
-	case MVM_TCP_TX_FIN:
-		pkt->tcp.fin = 1;
-		pkt->tcp.ack = 1;
-		break;
-	case MVM_TCP_RX_SYNACK:
-		pkt->tcp.syn = 1;
-		pkt->tcp.ack = 1;
-		break;
-	case MVM_TCP_RX_ACK:
-		pkt->tcp.ack = 1;
-		break;
-	case MVM_TCP_RX_WAKE:
-		ip_tot_len += tcp->wake_len;
-		pkt->tcp.psh = 1;
-		pkt->tcp.ack = 1;
-		memcpy(pkt->data, tcp->wake_data, tcp->wake_len);
-		break;
-	}
-
-	switch (ptype) {
-	case MVM_TCP_TX_SYN:
-	case MVM_TCP_TX_DATA:
-	case MVM_TCP_TX_FIN:
-		pkt->ip.tot_len = cpu_to_be16(ip_tot_len);
-		pkt->ip.check = ip_fast_csum(&pkt->ip, pkt->ip.ihl);
-		break;
-	case MVM_TCP_RX_WAKE:
-		for (i = 0; i < DIV_ROUND_UP(tcp->wake_len, 8); i++) {
-			u8 tmp = tcp->wake_mask[i];
-			mask[i + 6] |= tmp << 6;
-			if (i + 1 < DIV_ROUND_UP(tcp->wake_len, 8))
-				mask[i + 7] = tmp >> 2;
-		}
-		/* fall through for ethernet/IP/TCP headers mask */
-	case MVM_TCP_RX_SYNACK:
-	case MVM_TCP_RX_ACK:
-		mask[0] = 0xff; /* match ethernet */
-		/*
-		 * match ethernet, ip.version, ip.ihl
-		 * the ip.ihl half byte is really masked out by firmware
-		 */
-		mask[1] = 0x7f;
-		mask[2] = 0x80; /* match ip.protocol */
-		mask[3] = 0xfc; /* match ip.saddr, ip.daddr */
-		mask[4] = 0x3f; /* match ip.daddr, tcp.source, tcp.dest */
-		mask[5] = 0x80; /* match tcp flags */
-		/* leave rest (0 or set for MVM_TCP_RX_WAKE) */
-		break;
-	};
-
-	*pseudo_hdr_csum = pseudo_hdr_check(ip_tot_len - sizeof(struct iphdr),
-					    pkt->ip.saddr, pkt->ip.daddr);
-}
-
-static int iwl_mvm_send_remote_wake_cfg(struct iwl_mvm *mvm,
-					struct ieee80211_vif *vif,
-					struct cfg80211_wowlan_tcp *tcp)
-{
-	struct iwl_wowlan_remote_wake_config *cfg;
-	struct iwl_host_cmd cmd = {
-		.id = REMOTE_WAKE_CONFIG_CMD,
-		.len = { sizeof(*cfg), },
-		.dataflags = { IWL_HCMD_DFL_NOCOPY, },
-	};
-	int ret;
-
-	if (!tcp)
-		return 0;
-
-	cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
-	if (!cfg)
-		return -ENOMEM;
-	cmd.data[0] = cfg;
-
-	cfg->max_syn_retries = 10;
-	cfg->max_data_retries = 10;
-	cfg->tcp_syn_ack_timeout = 1; /* seconds */
-	cfg->tcp_ack_timeout = 1; /* seconds */
-
-	/* SYN (TX) */
-	iwl_mvm_build_tcp_packet(
-		vif, tcp, cfg->syn_tx.data, NULL,
-		&cfg->syn_tx.info.tcp_pseudo_header_checksum,
-		MVM_TCP_TX_SYN);
-	cfg->syn_tx.info.tcp_payload_length = 0;
-
-	/* SYN/ACK (RX) */
-	iwl_mvm_build_tcp_packet(
-		vif, tcp, cfg->synack_rx.data, cfg->synack_rx.rx_mask,
-		&cfg->synack_rx.info.tcp_pseudo_header_checksum,
-		MVM_TCP_RX_SYNACK);
-	cfg->synack_rx.info.tcp_payload_length = 0;
-
-	/* KEEPALIVE/ACK (TX) */
-	iwl_mvm_build_tcp_packet(
-		vif, tcp, cfg->keepalive_tx.data, NULL,
-		&cfg->keepalive_tx.info.tcp_pseudo_header_checksum,
-		MVM_TCP_TX_DATA);
-	cfg->keepalive_tx.info.tcp_payload_length =
-		cpu_to_le16(tcp->payload_len);
-	cfg->sequence_number_offset = tcp->payload_seq.offset;
-	/* length must be 0..4, the field is little endian */
-	cfg->sequence_number_length = tcp->payload_seq.len;
-	cfg->initial_sequence_number = cpu_to_le32(tcp->payload_seq.start);
-	cfg->keepalive_interval = cpu_to_le16(tcp->data_interval);
-	if (tcp->payload_tok.len) {
-		cfg->token_offset = tcp->payload_tok.offset;
-		cfg->token_length = tcp->payload_tok.len;
-		cfg->num_tokens =
-			cpu_to_le16(tcp->tokens_size % tcp->payload_tok.len);
-		memcpy(cfg->tokens, tcp->payload_tok.token_stream,
-		       tcp->tokens_size);
-	} else {
-		/* set tokens to max value to almost never run out */
-		cfg->num_tokens = cpu_to_le16(65535);
-	}
-
-	/* ACK (RX) */
-	iwl_mvm_build_tcp_packet(
-		vif, tcp, cfg->keepalive_ack_rx.data,
-		cfg->keepalive_ack_rx.rx_mask,
-		&cfg->keepalive_ack_rx.info.tcp_pseudo_header_checksum,
-		MVM_TCP_RX_ACK);
-	cfg->keepalive_ack_rx.info.tcp_payload_length = 0;
-
-	/* WAKEUP (RX) */
-	iwl_mvm_build_tcp_packet(
-		vif, tcp, cfg->wake_rx.data, cfg->wake_rx.rx_mask,
-		&cfg->wake_rx.info.tcp_pseudo_header_checksum,
-		MVM_TCP_RX_WAKE);
-	cfg->wake_rx.info.tcp_payload_length =
-		cpu_to_le16(tcp->wake_len);
-
-	/* FIN */
-	iwl_mvm_build_tcp_packet(
-		vif, tcp, cfg->fin_tx.data, NULL,
-		&cfg->fin_tx.info.tcp_pseudo_header_checksum,
-		MVM_TCP_TX_FIN);
-	cfg->fin_tx.info.tcp_payload_length = 0;
-
-	ret = iwl_mvm_send_cmd(mvm, &cmd);
-	kfree(cfg);
-
-	return ret;
-}
-
 static int iwl_mvm_d3_reprogram(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 				struct ieee80211_sta *ap_sta)
 {
@@ -1082,12 +857,7 @@ iwl_mvm_wowlan_config(struct iwl_mvm *mvm,
 	if (ret)
 		return ret;
 
-	ret = iwl_mvm_send_proto_offload(mvm, vif, false, true, 0);
-	if (ret)
-		return ret;
-
-	ret = iwl_mvm_send_remote_wake_cfg(mvm, vif, wowlan->tcp);
-	return ret;
+	return iwl_mvm_send_proto_offload(mvm, vif, false, true, 0);
 }
 
 static int
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
index 3e92a117c0b8..149d301e5e98 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
@@ -114,29 +114,6 @@ static const struct ieee80211_iface_combination iwl_mvm_iface_combinations[] = {
 	},
 };
 
-#ifdef CONFIG_PM_SLEEP
-static const struct nl80211_wowlan_tcp_data_token_feature
-iwl_mvm_wowlan_tcp_token_feature = {
-	.min_len = 0,
-	.max_len = 255,
-	.bufsize = IWL_WOWLAN_REMOTE_WAKE_MAX_TOKENS,
-};
-
-static const struct wiphy_wowlan_tcp_support iwl_mvm_wowlan_tcp_support = {
-	.tok = &iwl_mvm_wowlan_tcp_token_feature,
-	.data_payload_max = IWL_WOWLAN_TCP_MAX_PACKET_LEN -
-			    sizeof(struct ethhdr) -
-			    sizeof(struct iphdr) -
-			    sizeof(struct tcphdr),
-	.data_interval_max = 65535, /* __le16 in API */
-	.wake_payload_max = IWL_WOWLAN_REMOTE_WAKE_MAX_PACKET_LEN -
-			    sizeof(struct ethhdr) -
-			    sizeof(struct iphdr) -
-			    sizeof(struct tcphdr),
-	.seq = true,
-};
-#endif
-
 #ifdef CONFIG_IWLWIFI_BCAST_FILTERING
 /*
  * Use the reserved field to indicate magic values.
@@ -702,7 +679,6 @@ int iwl_mvm_mac_setup_register(struct iwl_mvm *mvm)
 		mvm->wowlan.pattern_min_len = IWL_WOWLAN_MIN_PATTERN_LEN;
 		mvm->wowlan.pattern_max_len = IWL_WOWLAN_MAX_PATTERN_LEN;
 		mvm->wowlan.max_nd_match_sets = IWL_SCAN_MAX_PROFILES;
-		mvm->wowlan.tcp = &iwl_mvm_wowlan_tcp_support;
 		hw->wiphy->wowlan = &mvm->wowlan;
 	}
 #endif
-- 
2.15.0