if (*port != 0) {
rover = be16_to_cpu(*port);
+ if (rover == RDS_FLAG_PROBE_PORT)
+ return -EINVAL;
last = rover;
} else {
rover = max_t(u16, prandom_u32(), 2);
if (rover == 0)
rover++;
+ if (rover == RDS_FLAG_PROBE_PORT)
+ continue;
key = ((u64)addr << 32) | cpu_to_be16(rover);
if (rhashtable_lookup_fast(&bind_hash_table, &key, ht_parms))
continue;
rs->rs_bound_key = key;
rs->rs_bound_addr = addr;
+ net_get_random_once(&rs->rs_hash_initval,
+ sizeof(rs->rs_hash_initval));
rs->rs_bound_port = cpu_to_be16(rover);
rs->rs_bound_node.next = NULL;
rds_sock_addref(rs);
struct hlist_head *head = rds_conn_bucket(laddr, faddr);
struct rds_transport *loop_trans;
unsigned long flags;
- int ret;
+ int ret, i;
rcu_read_lock();
conn = rds_conn_lookup(net, head, laddr, faddr, trans);
conn->c_trans = trans;
+ init_waitqueue_head(&conn->c_hs_waitq);
+ for (i = 0; i < RDS_MPATH_WORKERS; i++) {
+ __rds_conn_path_init(conn, &conn->c_path[i],
+ is_outgoing);
+ conn->c_path[i].cp_index = i;
+ }
ret = trans->conn_alloc(conn, gfp);
if (ret) {
kmem_cache_free(rds_conn_slab, conn);
kmem_cache_free(rds_conn_slab, conn);
conn = found;
} else {
- int i;
-
- for (i = 0; i < RDS_MPATH_WORKERS; i++) {
- __rds_conn_path_init(conn, &conn->c_path[i],
- is_outgoing);
- conn->c_path[i].cp_index = i;
- }
-
hlist_add_head_rcu(&conn->c_hash_node, head);
rds_cong_add_conn(conn);
rds_conn_count++;
void rds_conn_drop(struct rds_connection *conn)
{
+ WARN_ON(conn->c_trans->t_mp_capable);
rds_conn_path_drop(&conn->c_path[0]);
}
EXPORT_SYMBOL_GPL(rds_conn_drop);
[RDS_EXTHDR_VERSION] = sizeof(struct rds_ext_header_version),
[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),
};
#define RDS_RECV_REFILL 3
/* Max number of multipaths per RDS connection. Must be a power of 2 */
-#define RDS_MPATH_WORKERS 1
+#define RDS_MPATH_WORKERS 8
+#define RDS_MPATH_HASH(rs, n) (jhash_1word((rs)->rs_bound_port, \
+ (rs)->rs_hash_initval) & ((n) - 1))
/* Per mpath connection state */
struct rds_conn_path {
__be32 c_laddr;
__be32 c_faddr;
unsigned int c_loopback:1,
- c_pad_to_32:31;
+ c_ping_triggered:1,
+ c_pad_to_32:30;
int c_npaths;
struct rds_connection *c_passive;
struct rds_transport *c_trans;
unsigned long c_map_queued;
struct rds_conn_path c_path[RDS_MPATH_WORKERS];
+ wait_queue_head_t c_hs_waitq; /* handshake waitq */
};
static inline
#define RDS_FLAG_RETRANSMITTED 0x04
#define RDS_MAX_ADV_CREDIT 255
+/* RDS_FLAG_PROBE_PORT is the reserved sport used for sending a ping
+ * probe to exchange control information before establishing a connection.
+ * Currently the control information that is exchanged is the number of
+ * supported paths. If the peer is a legacy (older kernel revision) peer,
+ * it would return a pong message without additional control information
+ * that would then alert the sender that the peer was an older rev.
+ */
+#define RDS_FLAG_PROBE_PORT 1
+#define RDS_HS_PROBE(sport, dport) \
+ ((sport == RDS_FLAG_PROBE_PORT && dport == 0) || \
+ (sport == 0 && dport == RDS_FLAG_PROBE_PORT))
/*
* Maximum space available for extension headers.
*/
__be32 h_rdma_offset;
};
+/* Extension header announcing number of paths.
+ * Implicit length = 2 bytes.
+ */
+#define RDS_EXTHDR_NPATHS 4
+
#define __RDS_EXTHDR_MAX 16 /* for now */
struct rds_incoming {
/* Socket options - in case there will be more */
unsigned char rs_recverr,
rs_cong_monitor;
+ u32 rs_hash_initval;
};
static inline struct rds_sock *rds_sk_to_rs(const struct sock *sk)
}
}
+static void rds_recv_hs_exthdrs(struct rds_header *hdr,
+ struct rds_connection *conn)
+{
+ unsigned int pos = 0, type, len;
+ union {
+ struct rds_ext_header_version version;
+ u16 rds_npaths;
+ } buffer;
+
+ while (1) {
+ len = sizeof(buffer);
+ type = rds_message_next_extension(hdr, &pos, &buffer, &len);
+ if (type == RDS_EXTHDR_NONE)
+ break;
+ /* Process extension header here */
+ switch (type) {
+ case RDS_EXTHDR_NPATHS:
+ conn->c_npaths = min_t(int, RDS_MPATH_WORKERS,
+ buffer.rds_npaths);
+ break;
+ default:
+ pr_warn_ratelimited("ignoring unknown exthdr type "
+ "0x%x\n", type);
+ }
+ }
+ /* if RDS_EXTHDR_NPATHS was not found, default to a single-path */
+ conn->c_npaths = max_t(int, conn->c_npaths, 1);
+}
+
+/* rds_start_mprds() will synchronously start multiple paths when appropriate.
+ * The scheme is based on the following rules:
+ *
+ * 1. rds_sendmsg on first connect attempt sends the probe ping, with the
+ * sender's npaths (s_npaths)
+ * 2. rcvr of probe-ping knows the mprds_paths = min(s_npaths, r_npaths). It
+ * sends back a probe-pong with r_npaths. After that, if rcvr is the
+ * smaller ip addr, it starts rds_conn_path_connect_if_down on all
+ * mprds_paths.
+ * 3. sender gets woken up, and can move to rds_conn_path_connect_if_down.
+ * If it is the smaller ipaddr, rds_conn_path_connect_if_down can be
+ * called after reception of the probe-pong on all mprds_paths.
+ * Otherwise (sender of probe-ping is not the smaller ip addr): just call
+ * rds_conn_path_connect_if_down on the hashed path. (see rule 4)
+ * 4. when cp_index > 0, rds_connect_worker must only trigger
+ * a connection if laddr < faddr.
+ * 5. sender may end up queuing the packet on the cp. will get sent out later.
+ * when connection is completed.
+ */
+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) {
+ for (i = 1; i < conn->c_npaths; i++) {
+ cp = &conn->c_path[i];
+ rds_conn_path_connect_if_down(cp);
+ }
+ }
+}
+
/*
* The transport must make sure that this is serialized against other
* rx and conn reset on this specific conn.
}
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)) {
+ 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 &&
+ 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 */
+ rds_start_mprds(cp->cp_conn);
+ wake_up(&cp->cp_conn->c_hs_waitq);
goto out;
}
return ret;
}
+static void rds_send_ping(struct rds_connection *conn);
+
+static int rds_send_mprds_hash(struct rds_sock *rs, struct rds_connection *conn)
+{
+ int hash;
+
+ if (conn->c_npaths == 0)
+ hash = RDS_MPATH_HASH(rs, RDS_MPATH_WORKERS);
+ else
+ hash = RDS_MPATH_HASH(rs, conn->c_npaths);
+ if (conn->c_npaths == 0 && hash != 0) {
+ rds_send_ping(conn);
+
+ if (conn->c_npaths == 0) {
+ wait_event_interruptible(conn->c_hs_waitq,
+ (conn->c_npaths != 0));
+ }
+ if (conn->c_npaths == 1)
+ hash = 0;
+ }
+ return hash;
+}
+
int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len)
{
struct sock *sk = sock->sk;
goto out;
}
- cpath = &conn->c_path[0];
+ if (conn->c_trans->t_mp_capable)
+ cpath = &conn->c_path[rds_send_mprds_hash(rs, conn)];
+ else
+ cpath = &conn->c_path[0];
rds_conn_path_connect_if_down(cpath);
}
/*
- * Reply to a ping packet.
+ * send out a probe. Can be shared by rds_send_ping,
+ * rds_send_pong, rds_send_hb.
+ * rds_send_hb should use h_flags
+ * RDS_FLAG_HB_PING|RDS_FLAG_ACK_REQUIRED
+ * or
+ * RDS_FLAG_HB_PONG|RDS_FLAG_ACK_REQUIRED
*/
int
-rds_send_pong(struct rds_conn_path *cp, __be16 dport)
+rds_send_probe(struct rds_conn_path *cp, __be16 sport,
+ __be16 dport, u8 h_flags)
{
struct rds_message *rm;
unsigned long flags;
rm->m_inc.i_conn = cp->cp_conn;
rm->m_inc.i_conn_path = cp;
- rds_message_populate_header(&rm->m_inc.i_hdr, 0, dport,
+ rds_message_populate_header(&rm->m_inc.i_hdr, sport, dport,
cp->cp_next_tx_seq);
+ 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;
+
+ rds_message_add_extension(&rm->m_inc.i_hdr,
+ RDS_EXTHDR_NPATHS, &npaths,
+ sizeof(npaths));
+ }
spin_unlock_irqrestore(&cp->cp_lock, flags);
rds_stats_inc(s_send_queued);
rds_message_put(rm);
return ret;
}
+
+int
+rds_send_pong(struct rds_conn_path *cp, __be16 dport)
+{
+ return rds_send_probe(cp, 0, dport, 0);
+}
+
+void
+rds_send_ping(struct rds_connection *conn)
+{
+ unsigned long flags;
+ struct rds_conn_path *cp = &conn->c_path[0];
+
+ spin_lock_irqsave(&cp->cp_lock, flags);
+ if (conn->c_ping_triggered) {
+ spin_unlock_irqrestore(&cp->cp_lock, flags);
+ return;
+ }
+ 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);
+}
#include <net/net_namespace.h>
#include <net/netns/generic.h>
-#include "rds_single_path.h"
#include "rds.h"
#include "tcp.h"
.t_name = "tcp",
.t_type = RDS_TRANS_TCP,
.t_prefer_loopback = 1,
+ .t_mp_capable = 1,
};
static int rds_tcp_netid;
#include <linux/in.h>
#include <net/tcp.h>
-#include "rds_single_path.h"
#include "rds.h"
#include "tcp.h"
struct rds_connection *conn = cp->cp_conn;
struct rds_tcp_connection *tc = cp->cp_transport_data;
+ /* for multipath rds,we only trigger the connection after
+ * the handshake probe has determined the number of paths.
+ */
+ if (cp->cp_index > 0 && cp->cp_conn->c_npaths < 2)
+ return -EAGAIN;
+
mutex_lock(&tc->t_conn_path_lock);
if (rds_conn_path_up(cp)) {
#include <linux/in.h>
#include <net/tcp.h>
-#include "rds_single_path.h"
#include "rds.h"
#include "tcp.h"
return ret;
}
+/* rds_tcp_accept_one_path(): if accepting on cp_index > 0, make sure the
+ * client's ipaddr < server's ipaddr. Otherwise, close the accepted
+ * socket and force a reconneect from smaller -> larger ip addr. The reason
+ * we special case cp_index 0 is to allow the rds probe ping itself to itself
+ * get through efficiently.
+ * Since reconnects are only initiated from the node with the numerically
+ * smaller ip address, we recycle conns in RDS_CONN_ERROR on the passive side
+ * by moving them to CONNECTING in this function.
+ */
+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);
+ int npaths = conn->c_npaths;
+
+ if (npaths <= 1) {
+ struct rds_conn_path *cp = &conn->c_path[0];
+ int ret;
+
+ ret = rds_conn_path_transition(cp, RDS_CONN_DOWN,
+ RDS_CONN_CONNECTING);
+ if (!ret)
+ rds_conn_path_transition(cp, RDS_CONN_ERROR,
+ RDS_CONN_CONNECTING);
+ return cp->cp_transport_data;
+ }
+
+ /* for mprds, paths with cp_index > 0 MUST be initiated by the peer
+ * with the smaller address.
+ */
+ if (!peer_is_smaller)
+ return NULL;
+
+ for (i = 1; i < npaths; i++) {
+ struct rds_conn_path *cp = &conn->c_path[i];
+
+ if (rds_conn_path_transition(cp, RDS_CONN_DOWN,
+ RDS_CONN_CONNECTING) ||
+ rds_conn_path_transition(cp, RDS_CONN_ERROR,
+ RDS_CONN_CONNECTING)) {
+ return cp->cp_transport_data;
+ }
+ }
+ return NULL;
+}
+
int rds_tcp_accept_one(struct socket *sock)
{
struct socket *new_sock = NULL;
* If the client reboots, this conn will need to be cleaned up.
* rds_tcp_state_change() will do that cleanup
*/
- rs_tcp = (struct rds_tcp_connection *)conn->c_transport_data;
- cp = &conn->c_path[0];
- rds_conn_transition(conn, RDS_CONN_DOWN, RDS_CONN_CONNECTING);
+ rs_tcp = rds_tcp_accept_one_path(conn);
+ if (!rs_tcp)
+ goto rst_nsk;
mutex_lock(&rs_tcp->t_conn_path_lock);
- conn_state = rds_conn_state(conn);
- if (conn_state != RDS_CONN_CONNECTING && conn_state != RDS_CONN_UP)
+ cp = rs_tcp->t_cpath;
+ conn_state = rds_conn_path_state(cp);
+ if (conn_state != RDS_CONN_CONNECTING && conn_state != RDS_CONN_UP &&
+ conn_state != RDS_CONN_ERROR)
goto rst_nsk;
if (rs_tcp->t_sock) {
/* Need to resolve a duelling SYN between peers.
* c_transport_data.
*/
if (ntohl(inet->inet_saddr) < ntohl(inet->inet_daddr) ||
- !conn->c_path[0].cp_outgoing) {
+ !cp->cp_outgoing) {
goto rst_nsk;
} else {
rds_tcp_reset_callbacks(new_sock, cp);
- conn->c_path[0].cp_outgoing = 0;
+ cp->cp_outgoing = 0;
/* rds_connect_path_complete() marks RDS_CONN_UP */
rds_connect_path_complete(cp, RDS_CONN_RESETTING);
}
int rds_tcp_xmit(struct rds_connection *conn, struct rds_message *rm,
unsigned int hdr_off, unsigned int sg, unsigned int off)
{
- struct rds_tcp_connection *tc = conn->c_transport_data;
+ struct rds_conn_path *cp = rm->m_inc.i_conn_path;
+ struct rds_tcp_connection *tc = cp->cp_transport_data;
int done = 0;
int ret = 0;
int more;
rds_tcp_stats_inc(s_tcp_sndbuf_full);
ret = 0;
} else {
- printk(KERN_WARNING "RDS/tcp: send to %pI4 "
- "returned %d, disconnecting and reconnecting\n",
- &conn->c_faddr, ret);
- rds_conn_drop(conn);
+ /* No need to disconnect/reconnect if path_drop
+ * has already been triggered, because, e.g., of
+ * an incoming RST.
+ */
+ if (rds_conn_path_up(cp)) {
+ pr_warn("RDS/tcp: send to %pI4 on cp [%d]"
+ "returned %d, "
+ "disconnecting and reconnecting\n",
+ &conn->c_faddr, cp->cp_index, ret);
+ rds_conn_path_drop(cp);
+ }
}
}
if (done == 0)
struct rds_connection *conn = cp->cp_conn;
int ret;
+ if (cp->cp_index > 1 && 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);
if (ret) {
projects / GitHub / moto-9609 / android_kernel_motorola_exynos9610.git / commitdiff