Commit 34a95132 authored by David S. Miller's avatar David S. Miller

Merge branch 'rds-tcp-misc-bug-fixes'

Sowmini Varadhan says:

====================
rds: tcp: misc bug fixes

This series contains 2 bug fixes (patch2, patch3) and one bit of
code cleanup (patch1) identified during database testing
====================
Signed-off-by: default avatarDavid S. Miller <[email protected]>
parents 5f886eef 10beea7d
......@@ -124,11 +124,6 @@ static void __rds_conn_path_init(struct rds_connection *conn,
cp->cp_conn = conn;
atomic_set(&cp->cp_state, RDS_CONN_DOWN);
cp->cp_send_gen = 0;
/* cp_outgoing is per-path. So we can only set it here
* for the single-path transports.
*/
if (!conn->c_trans->t_mp_capable)
cp->cp_outgoing = (is_outgoing ? 1 : 0);
cp->cp_reconnect_jiffies = 0;
INIT_DELAYED_WORK(&cp->cp_send_w, rds_send_worker);
INIT_DELAYED_WORK(&cp->cp_recv_w, rds_recv_worker);
......
......@@ -92,6 +92,8 @@ enum {
#define RDS_MPATH_HASH(rs, n) (jhash_1word((rs)->rs_bound_port, \
(rs)->rs_hash_initval) & ((n) - 1))
#define IS_CANONICAL(laddr, faddr) (htonl(laddr) < htonl(faddr))
/* Per mpath connection state */
struct rds_conn_path {
struct rds_connection *cp_conn;
......@@ -125,8 +127,6 @@ struct rds_conn_path {
unsigned int cp_unacked_packets;
unsigned int cp_unacked_bytes;
unsigned int cp_outgoing:1,
cp_pad_to_32:31;
unsigned int cp_index;
};
......
......@@ -215,10 +215,10 @@ static void rds_recv_hs_exthdrs(struct rds_header *hdr,
switch (type) {
case RDS_EXTHDR_NPATHS:
conn->c_npaths = min_t(int, RDS_MPATH_WORKERS,
buffer.rds_npaths);
be16_to_cpu(buffer.rds_npaths));
break;
case RDS_EXTHDR_GEN_NUM:
new_peer_gen_num = buffer.rds_gen_num;
new_peer_gen_num = be32_to_cpu(buffer.rds_gen_num);
break;
default:
pr_warn_ratelimited("ignoring unknown exthdr type "
......@@ -254,7 +254,8 @@ static void rds_start_mprds(struct rds_connection *conn)
int i;
struct rds_conn_path *cp;
if (conn->c_npaths > 1 && conn->c_laddr < conn->c_faddr) {
if (conn->c_npaths > 1 &&
IS_CANONICAL(conn->c_laddr, conn->c_faddr)) {
for (i = 1; i < conn->c_npaths; i++) {
cp = &conn->c_path[i];
rds_conn_path_connect_if_down(cp);
......@@ -339,14 +340,15 @@ void rds_recv_incoming(struct rds_connection *conn, __be32 saddr, __be32 daddr,
rds_stats_inc(s_recv_ping);
rds_send_pong(cp, inc->i_hdr.h_sport);
/* if this is a handshake ping, start multipath if necessary */
if (RDS_HS_PROBE(inc->i_hdr.h_sport, inc->i_hdr.h_dport)) {
if (RDS_HS_PROBE(be16_to_cpu(inc->i_hdr.h_sport),
be16_to_cpu(inc->i_hdr.h_dport))) {
rds_recv_hs_exthdrs(&inc->i_hdr, cp->cp_conn);
rds_start_mprds(cp->cp_conn);
}
goto out;
}
if (inc->i_hdr.h_dport == RDS_FLAG_PROBE_PORT &&
if (be16_to_cpu(inc->i_hdr.h_dport) == RDS_FLAG_PROBE_PORT &&
inc->i_hdr.h_sport == 0) {
rds_recv_hs_exthdrs(&inc->i_hdr, cp->cp_conn);
/* if this is a handshake pong, start multipath if necessary */
......
......@@ -1246,15 +1246,17 @@ rds_send_probe(struct rds_conn_path *cp, __be16 sport,
rm->m_inc.i_hdr.h_flags |= h_flags;
cp->cp_next_tx_seq++;
if (RDS_HS_PROBE(sport, dport) && cp->cp_conn->c_trans->t_mp_capable) {
u16 npaths = RDS_MPATH_WORKERS;
if (RDS_HS_PROBE(be16_to_cpu(sport), be16_to_cpu(dport)) &&
cp->cp_conn->c_trans->t_mp_capable) {
u16 npaths = cpu_to_be16(RDS_MPATH_WORKERS);
u32 my_gen_num = cpu_to_be32(cp->cp_conn->c_my_gen_num);
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,
&my_gen_num,
sizeof(u32));
}
spin_unlock_irqrestore(&cp->cp_lock, flags);
......@@ -1293,5 +1295,6 @@ rds_send_ping(struct rds_connection *conn)
}
conn->c_ping_triggered = 1;
spin_unlock_irqrestore(&cp->cp_lock, flags);
rds_send_probe(&conn->c_path[0], RDS_FLAG_PROBE_PORT, 0, 0);
rds_send_probe(&conn->c_path[0], cpu_to_be16(RDS_FLAG_PROBE_PORT),
0, 0);
}
......@@ -66,7 +66,7 @@ void rds_tcp_state_change(struct sock *sk)
* RDS connection as RDS_CONN_UP until the reconnect,
* to avoid RDS datagram loss.
*/
if (cp->cp_conn->c_laddr > cp->cp_conn->c_faddr &&
if (!IS_CANONICAL(cp->cp_conn->c_laddr, cp->cp_conn->c_faddr) &&
rds_conn_path_transition(cp, RDS_CONN_CONNECTING,
RDS_CONN_ERROR)) {
rds_conn_path_drop(cp);
......@@ -135,7 +135,6 @@ int rds_tcp_conn_path_connect(struct rds_conn_path *cp)
ret = sock->ops->connect(sock, (struct sockaddr *)&dest, sizeof(dest),
O_NONBLOCK);
cp->cp_outgoing = 1;
rdsdebug("connect to address %pI4 returned %d\n", &conn->c_faddr, ret);
if (ret == -EINPROGRESS)
ret = 0;
......
......@@ -83,7 +83,7 @@ static
struct rds_tcp_connection *rds_tcp_accept_one_path(struct rds_connection *conn)
{
int i;
bool peer_is_smaller = (conn->c_faddr < conn->c_laddr);
bool peer_is_smaller = IS_CANONICAL(conn->c_faddr, conn->c_laddr);
int npaths = max_t(int, 1, conn->c_npaths);
/* for mprds, all paths MUST be initiated by the peer
......@@ -112,6 +112,17 @@ struct rds_tcp_connection *rds_tcp_accept_one_path(struct rds_connection *conn)
return NULL;
}
static void rds_tcp_set_linger(struct socket *sock)
{
struct linger no_linger = {
.l_onoff = 1,
.l_linger = 0,
};
kernel_setsockopt(sock, SOL_SOCKET, SO_LINGER,
(char *)&no_linger, sizeof(no_linger));
}
int rds_tcp_accept_one(struct socket *sock)
{
struct socket *new_sock = NULL;
......@@ -171,21 +182,10 @@ int rds_tcp_accept_one(struct socket *sock)
if (conn_state != RDS_CONN_CONNECTING && conn_state != RDS_CONN_ERROR)
goto rst_nsk;
if (rs_tcp->t_sock) {
/* Need to resolve a duelling SYN between peers.
* We have an outstanding SYN to this peer, which may
* potentially have transitioned to the RDS_CONN_UP state,
* so we must quiesce any send threads before resetting
* c_transport_data.
*/
if (ntohl(inet->inet_saddr) < ntohl(inet->inet_daddr) ||
!cp->cp_outgoing) {
goto rst_nsk;
} else {
rds_tcp_reset_callbacks(new_sock, cp);
cp->cp_outgoing = 0;
/* rds_connect_path_complete() marks RDS_CONN_UP */
rds_connect_path_complete(cp, RDS_CONN_RESETTING);
}
/* Duelling SYN has been handled in rds_tcp_accept_one() */
rds_tcp_reset_callbacks(new_sock, cp);
/* rds_connect_path_complete() marks RDS_CONN_UP */
rds_connect_path_complete(cp, RDS_CONN_RESETTING);
} else {
rds_tcp_set_callbacks(new_sock, cp);
rds_connect_path_complete(cp, RDS_CONN_CONNECTING);
......@@ -194,7 +194,13 @@ int rds_tcp_accept_one(struct socket *sock)
ret = 0;
goto out;
rst_nsk:
/* reset the newly returned accept sock and bail */
/* reset the newly returned accept sock and bail.
* It is safe to set linger on new_sock because the RDS connection
* has not been brought up on new_sock, so no RDS-level data could
* be pending on it. By setting linger, we achieve the side-effect
* of avoiding TIME_WAIT state on new_sock.
*/
rds_tcp_set_linger(new_sock);
kernel_sock_shutdown(new_sock, SHUT_RDWR);
ret = 0;
out:
......
......@@ -127,7 +127,7 @@ void rds_queue_reconnect(struct rds_conn_path *cp)
/* let peer with smaller addr initiate reconnect, to avoid duels */
if (conn->c_trans->t_type == RDS_TRANS_TCP &&
conn->c_laddr > conn->c_faddr)
!IS_CANONICAL(conn->c_laddr, conn->c_faddr))
return;
set_bit(RDS_RECONNECT_PENDING, &cp->cp_flags);
......@@ -156,7 +156,8 @@ void rds_connect_worker(struct work_struct *work)
struct rds_connection *conn = cp->cp_conn;
int ret;
if (cp->cp_index > 0 && cp->cp_conn->c_laddr > cp->cp_conn->c_faddr)
if (cp->cp_index > 0 &&
!IS_CANONICAL(cp->cp_conn->c_laddr, cp->cp_conn->c_faddr))
return;
clear_bit(RDS_RECONNECT_PENDING, &cp->cp_flags);
ret = rds_conn_path_transition(cp, RDS_CONN_DOWN, RDS_CONN_CONNECTING);
......
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