[MPTCP] [PATCH] mptcp: Store 32 and 64-bit ACKs separately

[Peter Krystad <peter.krystad at linux.intel.com>]

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Will be useful optimizing struct mptcp_options_received.

squashto: Implement MPTCP receive path

Signed-off-by: Peter Krystad <peter.krystad(a)linux.intel.com>
---
 include/linux/tcp.h |  2 ++
 net/mptcp/options.c | 24 ++++++++++++++++--------
 2 files changed, 18 insertions(+), 8 deletions(-)

diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index 0d00dad4b85d..6abf8d9f1a42 100644
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h
@@ -82,6 +82,8 @@ struct tcp_sack_block {
 struct mptcp_options_received {
 	u64	sndr_key;
 	u64	rcvr_key;
+	u32	data_ack32;
+	u32	data_seq32;
 	u64	data_ack;
 	u64	data_seq;
 	u32	subflow_seq;
diff --git a/net/mptcp/options.c b/net/mptcp/options.c
index db224e050666..b7f1892d8320 100644
--- a/net/mptcp/options.c
+++ b/net/mptcp/options.c
@@ -142,21 +142,23 @@ void mptcp_parse_option(const unsigned char *ptr, int opsize,
 		if (mp_opt->use_ack) {
 			if (mp_opt->ack64) {
 				mp_opt->data_ack = get_unaligned_be64(ptr);
+				pr_debug("data_ack=%llu", mp_opt->data_ack);
 				ptr += 8;
 			} else {
-				mp_opt->data_ack = get_unaligned_be32(ptr);
+				mp_opt->data_ack32 = get_unaligned_be32(ptr);
+				pr_debug("data_ack32=%u", mp_opt->data_ack32);
 				ptr += 4;
 			}
-
-			pr_debug("data_ack=%llu", mp_opt->data_ack);
 		}
 
 		if (mp_opt->use_map) {
 			if (mp_opt->dsn64) {
 				mp_opt->data_seq = get_unaligned_be64(ptr);
+				pr_debug("data_seq=%llu", mp_opt->data_seq);
 				ptr += 8;
 			} else {
-				mp_opt->data_seq = get_unaligned_be32(ptr);
+				mp_opt->data_seq32 = get_unaligned_be32(ptr);
+				pr_debug("data_seq32=%u", mp_opt->data_seq32);
 				ptr += 4;
 			}
 
@@ -166,9 +168,8 @@ void mptcp_parse_option(const unsigned char *ptr, int opsize,
 			mp_opt->data_len = get_unaligned_be16(ptr);
 			ptr += 2;
 
-			pr_debug("data_seq=%llu subflow_seq=%u data_len=%u",
-				 mp_opt->data_seq, mp_opt->subflow_seq,
-				 mp_opt->data_len);
+			pr_debug("subflow_seq=%u data_len=%u",
+				 mp_opt->subflow_seq, mp_opt->data_len);
 		}
 
 		break;
@@ -428,7 +429,10 @@ void mptcp_incoming_options(struct sock *sk, struct sk_buff *skb,
 	memset(mpext, 0, sizeof(*mpext));
 
 	if (mp_opt->use_map) {
-		mpext->data_seq = mp_opt->data_seq;
+		if (mp_opt->dsn64)
+			mpext->data_seq = mp_opt->data_seq;
+		else
+			mpext->data_seq = mp_opt->data_seq32;
 		mpext->subflow_seq = mp_opt->subflow_seq;
 		mpext->data_len = mp_opt->data_len;
 		mpext->use_map = 1;
@@ -436,6 +440,10 @@ void mptcp_incoming_options(struct sock *sk, struct sk_buff *skb,
 	}
 
 	if (mp_opt->use_ack) {
+		if (mp_opt->ack64)
+			mpext->data_ack = mp_opt->data_ack;
+		else
+			mpext->data_ack = mp_opt->data_ack32;
 		mpext->data_ack = mp_opt->data_ack;
 		mpext->use_ack = 1;
 		mpext->ack64 = mp_opt->ack64;
-- 
2.17.2