RDS: TCP: Track peer's connection generation number

The RDS transport has to be able to distinguish between
two types of failure events:
(a) when the transport fails (e.g., TCP connection reset)
    but the RDS socket/connection layer on both sides stays
    the same
(b) when the peer's RDS layer itself resets (e.g., due to module
    reload or machine reboot at the peer)
In case (a) both sides must reconnect and continue the RDS messaging
without any message loss or disruption to the message sequence numbers,
and this is achieved by rds_send_path_reset().

In case (b) we should reset all rds_connection state to the
new incarnation of the peer. Examples of state that needs to
be reset are next expected rx sequence number from, or messages to be
retransmitted to, the new incarnation of the peer.

To achieve this, the RDS handshake probe added as part of
commit 5916e2c1554f ("RDS: TCP: Enable multipath RDS for TCP")
is enhanced so that sender and receiver of the RDS ping-probe
will add a generation number as part of the RDS_EXTHDR_GEN_NUM
extension header. Each peer stores local and remote generation
numbers as part of each rds_connection. Changes in generation
number will be detected via incoming handshake probe ping
request or response and will allow the receiver to reset rds_connection
state.

Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

6 files changed, 57 insertions, 3 deletions

diff --git a/net/rds/af_rds.c b/net/rds/af_rds.c
index 6beaeb1138f3..2ac1e6194be3 100644
--- a/net/rds/af_rds.c
+++ b/net/rds/af_rds.c
@@ -605,10 +605,14 @@ static void rds_exit(void)
 }
 module_exit(rds_exit);
 
+u32 rds_gen_num;
+
 static int rds_init(void)
 {
         int ret;
 
+        net_get_random_once(&rds_gen_num, sizeof(rds_gen_num));
+
         ret = rds_bind_lock_init();
         if (ret)
                 goto out;
diff --git a/net/rds/connection.c b/net/rds/connection.c
index 13f459dad4ef..b86e188bde32 100644
--- a/net/rds/connection.c
+++ b/net/rds/connection.c
@@ -269,6 +269,8 @@ static struct rds_connection *__rds_conn_create(struct net *net,
                         kmem_cache_free(rds_conn_slab, conn);
                         conn = found;
                 } else {
+                        conn->c_my_gen_num = rds_gen_num;
+                        conn->c_peer_gen_num = 0;
                         hlist_add_head_rcu(&conn->c_hash_node, head);
                         rds_cong_add_conn(conn);
                         rds_conn_count++;
diff --git a/net/rds/message.c b/net/rds/message.c
index 6cb91061556a..49bfb512d808 100644
--- a/net/rds/message.c
+++ b/net/rds/message.c
@@ -42,6 +42,7 @@ static unsigned int	rds_exthdr_size[__RDS_EXTHDR_MAX] = {
 [RDS_EXTHDR_RDMA]       = sizeof(struct rds_ext_header_rdma),
 [RDS_EXTHDR_RDMA_DEST]  = sizeof(struct rds_ext_header_rdma_dest),
 [RDS_EXTHDR_NPATHS]     = sizeof(u16),
+[RDS_EXTHDR_GEN_NUM]    = sizeof(u32),
 };
 
 
diff --git a/net/rds/rds.h b/net/rds/rds.h
index 4121e1862444..ebbf909b87ec 100644
--- a/net/rds/rds.h
+++ b/net/rds/rds.h
@@ -151,6 +151,9 @@ struct rds_connection {
 
         struct rds_conn_path    c_path[RDS_MPATH_WORKERS];
         wait_queue_head_t       c_hs_waitq; /* handshake waitq */
+
+        u32                     c_my_gen_num;
+        u32                     c_peer_gen_num;
 };
 
 static inline
@@ -243,7 +246,8 @@ struct rds_ext_header_rdma_dest {
 /* Extension header announcing number of paths.
  * Implicit length = 2 bytes.
  */
-#define RDS_EXTHDR_NPATHS       4
+#define RDS_EXTHDR_NPATHS       5
+#define RDS_EXTHDR_GEN_NUM      6
 
 #define __RDS_EXTHDR_MAX        16 /* for now */
 
@@ -338,6 +342,7 @@ static inline u32 rds_rdma_cookie_offset(rds_rdma_cookie_t cookie)
 #define RDS_MSG_RETRANSMITTED   5
 #define RDS_MSG_MAPPED          6
 #define RDS_MSG_PAGEVEC         7
+#define RDS_MSG_FLUSH           8
 
 struct rds_message {
         atomic_t                m_refcount;
@@ -664,6 +669,7 @@ void rds_cong_exit(void);
 struct rds_message *rds_cong_update_alloc(struct rds_connection *conn);
 
 /* conn.c */
+extern u32 rds_gen_num;
 int rds_conn_init(void);
 void rds_conn_exit(void);
 struct rds_connection *rds_conn_create(struct net *net,
diff --git a/net/rds/recv.c b/net/rds/recv.c
index cbfabdf3ff48..9d0666e5fe35 100644
--- a/net/rds/recv.c
+++ b/net/rds/recv.c
@@ -120,6 +120,36 @@ static void rds_recv_rcvbuf_delta(struct rds_sock *rs, struct sock *sk,
         /* do nothing if no change in cong state */
 }
 
+static void rds_conn_peer_gen_update(struct rds_connection *conn,
+                                     u32 peer_gen_num)
+{
+        int i;
+        struct rds_message *rm, *tmp;
+        unsigned long flags;
+
+        WARN_ON(conn->c_trans->t_type != RDS_TRANS_TCP);
+        if (peer_gen_num != 0) {
+                if (conn->c_peer_gen_num != 0 &&
+                    peer_gen_num != conn->c_peer_gen_num) {
+                        for (i = 0; i < RDS_MPATH_WORKERS; i++) {
+                                struct rds_conn_path *cp;
+
+                                cp = &conn->c_path[i];
+                                spin_lock_irqsave(&cp->cp_lock, flags);
+                                cp->cp_next_tx_seq = 1;
+                                cp->cp_next_rx_seq = 0;
+                                list_for_each_entry_safe(rm, tmp,
+                                                         &cp->cp_retrans,
+                                                         m_conn_item) {
+                                        set_bit(RDS_MSG_FLUSH, &rm->m_flags);
+                                }
+                                spin_unlock_irqrestore(&cp->cp_lock, flags);
+                        }
+                }
+                conn->c_peer_gen_num = peer_gen_num;
+        }
+}
+
 /*
  * Process all extension headers that come with this message.
  */
@@ -163,7 +193,9 @@ static void rds_recv_hs_exthdrs(struct rds_header *hdr,
         union {
                 struct rds_ext_header_version version;
                 u16 rds_npaths;
+                u32 rds_gen_num;
         } buffer;
+        u32 new_peer_gen_num = 0;
 
         while (1) {
                 len = sizeof(buffer);
@@ -176,6 +208,9 @@ static void rds_recv_hs_exthdrs(struct rds_header *hdr,
                         conn->c_npaths = min_t(int, RDS_MPATH_WORKERS,
                                                buffer.rds_npaths);
                         break;
+                case RDS_EXTHDR_GEN_NUM:
+                        new_peer_gen_num = buffer.rds_gen_num;
+                        break;
                 default:
                         pr_warn_ratelimited("ignoring unknown exthdr type "
                                              "0x%x\n", type);
@@ -183,6 +218,7 @@ static void rds_recv_hs_exthdrs(struct rds_header *hdr,
         }
         /* if RDS_EXTHDR_NPATHS was not found, default to a single-path */
         conn->c_npaths = max_t(int, conn->c_npaths, 1);
+        rds_conn_peer_gen_update(conn, new_peer_gen_num);
 }
 
 /* rds_start_mprds() will synchronously start multiple paths when appropriate.
diff --git a/net/rds/send.c b/net/rds/send.c
index 896626b9a0ef..77c8c6e613ad 100644
--- a/net/rds/send.c
+++ b/net/rds/send.c
@@ -259,8 +259,9 @@ restart:
                          * connection.
                          * Therefore, we never retransmit messages with RDMA ops.
                          */
-                        if (rm->rdma.op_active &&
-                            test_bit(RDS_MSG_RETRANSMITTED, &rm->m_flags)) {
+                        if (test_bit(RDS_MSG_FLUSH, &rm->m_flags) ||
+                            (rm->rdma.op_active &&
+                            test_bit(RDS_MSG_RETRANSMITTED, &rm->m_flags))) {
                                 spin_lock_irqsave(&cp->cp_lock, flags);
                                 if (test_and_clear_bit(RDS_MSG_ON_CONN, &rm->m_flags))
                                         list_move(&rm->m_conn_item, &to_be_dropped);
@@ -1209,6 +1210,10 @@ rds_send_probe(struct rds_conn_path *cp, __be16 sport,
                 rds_message_add_extension(&rm->m_inc.i_hdr,
                                           RDS_EXTHDR_NPATHS, &npaths,
                                           sizeof(npaths));
+                rds_message_add_extension(&rm->m_inc.i_hdr,
+                                          RDS_EXTHDR_GEN_NUM,
+                                          &cp->cp_conn->c_my_gen_num,
+                                          sizeof(u32));
         }
         spin_unlock_irqrestore(&cp->cp_lock, flags);