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path: root/drivers/staging/lustre/lnet/klnds/socklnd/socklnd_proto.c
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Diffstat (limited to 'drivers/staging/lustre/lnet/klnds/socklnd/socklnd_proto.c')
-rw-r--r--drivers/staging/lustre/lnet/klnds/socklnd/socklnd_proto.c797
1 files changed, 797 insertions, 0 deletions
diff --git a/drivers/staging/lustre/lnet/klnds/socklnd/socklnd_proto.c b/drivers/staging/lustre/lnet/klnds/socklnd/socklnd_proto.c
new file mode 100644
index 000000000000..ec57179f8d2b
--- /dev/null
+++ b/drivers/staging/lustre/lnet/klnds/socklnd/socklnd_proto.c
@@ -0,0 +1,797 @@
+/*
+ * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
+ *
+ * Copyright (c) 2012, Intel Corporation.
+ *
+ * Author: Zach Brown <zab@zabbo.net>
+ * Author: Peter J. Braam <braam@clusterfs.com>
+ * Author: Phil Schwan <phil@clusterfs.com>
+ * Author: Eric Barton <eric@bartonsoftware.com>
+ *
+ * This file is part of Portals, http://www.sf.net/projects/sandiaportals/
+ *
+ * Portals is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * Portals is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Portals; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "socklnd.h"
+
+/*
+ * Protocol entries :
+ * pro_send_hello : send hello message
+ * pro_recv_hello : receive hello message
+ * pro_pack : pack message header
+ * pro_unpack : unpack message header
+ * pro_queue_tx_zcack() : Called holding BH lock: kss_lock
+ * return 1 if ACK is piggybacked, otherwise return 0
+ * pro_queue_tx_msg() : Called holding BH lock: kss_lock
+ * return the ACK that piggybacked by my message, or NULL
+ * pro_handle_zcreq() : handler of incoming ZC-REQ
+ * pro_handle_zcack() : handler of incoming ZC-ACK
+ * pro_match_tx() : Called holding glock
+ */
+
+static ksock_tx_t *
+ksocknal_queue_tx_msg_v1(ksock_conn_t *conn, ksock_tx_t *tx_msg)
+{
+ /* V1.x, just enqueue it */
+ list_add_tail(&tx_msg->tx_list, &conn->ksnc_tx_queue);
+ return NULL;
+}
+
+void
+ksocknal_next_tx_carrier(ksock_conn_t *conn)
+{
+ ksock_tx_t *tx = conn->ksnc_tx_carrier;
+
+ /* Called holding BH lock: conn->ksnc_scheduler->kss_lock */
+ LASSERT (!list_empty(&conn->ksnc_tx_queue));
+ LASSERT (tx != NULL);
+
+ /* Next TX that can carry ZC-ACK or LNet message */
+ if (tx->tx_list.next == &conn->ksnc_tx_queue) {
+ /* no more packets queued */
+ conn->ksnc_tx_carrier = NULL;
+ } else {
+ conn->ksnc_tx_carrier = list_entry(tx->tx_list.next,
+ ksock_tx_t, tx_list);
+ LASSERT (conn->ksnc_tx_carrier->tx_msg.ksm_type == tx->tx_msg.ksm_type);
+ }
+}
+
+static int
+ksocknal_queue_tx_zcack_v2(ksock_conn_t *conn,
+ ksock_tx_t *tx_ack, __u64 cookie)
+{
+ ksock_tx_t *tx = conn->ksnc_tx_carrier;
+
+ LASSERT (tx_ack == NULL ||
+ tx_ack->tx_msg.ksm_type == KSOCK_MSG_NOOP);
+
+ /*
+ * Enqueue or piggyback tx_ack / cookie
+ * . no tx can piggyback cookie of tx_ack (or cookie), just
+ * enqueue the tx_ack (if tx_ack != NUL) and return NULL.
+ * . There is tx can piggyback cookie of tx_ack (or cookie),
+ * piggyback the cookie and return the tx.
+ */
+ if (tx == NULL) {
+ if (tx_ack != NULL) {
+ list_add_tail(&tx_ack->tx_list,
+ &conn->ksnc_tx_queue);
+ conn->ksnc_tx_carrier = tx_ack;
+ }
+ return 0;
+ }
+
+ if (tx->tx_msg.ksm_type == KSOCK_MSG_NOOP) {
+ /* tx is noop zc-ack, can't piggyback zc-ack cookie */
+ if (tx_ack != NULL)
+ list_add_tail(&tx_ack->tx_list,
+ &conn->ksnc_tx_queue);
+ return 0;
+ }
+
+ LASSERT(tx->tx_msg.ksm_type == KSOCK_MSG_LNET);
+ LASSERT(tx->tx_msg.ksm_zc_cookies[1] == 0);
+
+ if (tx_ack != NULL)
+ cookie = tx_ack->tx_msg.ksm_zc_cookies[1];
+
+ /* piggyback the zc-ack cookie */
+ tx->tx_msg.ksm_zc_cookies[1] = cookie;
+ /* move on to the next TX which can carry cookie */
+ ksocknal_next_tx_carrier(conn);
+
+ return 1;
+}
+
+static ksock_tx_t *
+ksocknal_queue_tx_msg_v2(ksock_conn_t *conn, ksock_tx_t *tx_msg)
+{
+ ksock_tx_t *tx = conn->ksnc_tx_carrier;
+
+ /*
+ * Enqueue tx_msg:
+ * . If there is no NOOP on the connection, just enqueue
+ * tx_msg and return NULL
+ * . If there is NOOP on the connection, piggyback the cookie
+ * and replace the NOOP tx, and return the NOOP tx.
+ */
+ if (tx == NULL) { /* nothing on queue */
+ list_add_tail(&tx_msg->tx_list, &conn->ksnc_tx_queue);
+ conn->ksnc_tx_carrier = tx_msg;
+ return NULL;
+ }
+
+ if (tx->tx_msg.ksm_type == KSOCK_MSG_LNET) { /* nothing to carry */
+ list_add_tail(&tx_msg->tx_list, &conn->ksnc_tx_queue);
+ return NULL;
+ }
+
+ LASSERT (tx->tx_msg.ksm_type == KSOCK_MSG_NOOP);
+
+ /* There is a noop zc-ack can be piggybacked */
+ tx_msg->tx_msg.ksm_zc_cookies[1] = tx->tx_msg.ksm_zc_cookies[1];
+ ksocknal_next_tx_carrier(conn);
+
+ /* use new_tx to replace the noop zc-ack packet */
+ list_add(&tx_msg->tx_list, &tx->tx_list);
+ list_del(&tx->tx_list);
+
+ return tx;
+}
+
+static int
+ksocknal_queue_tx_zcack_v3(ksock_conn_t *conn,
+ ksock_tx_t *tx_ack, __u64 cookie)
+{
+ ksock_tx_t *tx;
+
+ if (conn->ksnc_type != SOCKLND_CONN_ACK)
+ return ksocknal_queue_tx_zcack_v2(conn, tx_ack, cookie);
+
+ /* non-blocking ZC-ACK (to router) */
+ LASSERT (tx_ack == NULL ||
+ tx_ack->tx_msg.ksm_type == KSOCK_MSG_NOOP);
+
+ if ((tx = conn->ksnc_tx_carrier) == NULL) {
+ if (tx_ack != NULL) {
+ list_add_tail(&tx_ack->tx_list,
+ &conn->ksnc_tx_queue);
+ conn->ksnc_tx_carrier = tx_ack;
+ }
+ return 0;
+ }
+
+ /* conn->ksnc_tx_carrier != NULL */
+
+ if (tx_ack != NULL)
+ cookie = tx_ack->tx_msg.ksm_zc_cookies[1];
+
+ if (cookie == SOCKNAL_KEEPALIVE_PING) /* ignore keepalive PING */
+ return 1;
+
+ if (tx->tx_msg.ksm_zc_cookies[1] == SOCKNAL_KEEPALIVE_PING) {
+ /* replace the keepalive PING with a real ACK */
+ LASSERT (tx->tx_msg.ksm_zc_cookies[0] == 0);
+ tx->tx_msg.ksm_zc_cookies[1] = cookie;
+ return 1;
+ }
+
+ if (cookie == tx->tx_msg.ksm_zc_cookies[0] ||
+ cookie == tx->tx_msg.ksm_zc_cookies[1]) {
+ CWARN("%s: duplicated ZC cookie: "LPU64"\n",
+ libcfs_id2str(conn->ksnc_peer->ksnp_id), cookie);
+ return 1; /* XXX return error in the future */
+ }
+
+ if (tx->tx_msg.ksm_zc_cookies[0] == 0) {
+ /* NOOP tx has only one ZC-ACK cookie, can carry at least one more */
+ if (tx->tx_msg.ksm_zc_cookies[1] > cookie) {
+ tx->tx_msg.ksm_zc_cookies[0] = tx->tx_msg.ksm_zc_cookies[1];
+ tx->tx_msg.ksm_zc_cookies[1] = cookie;
+ } else {
+ tx->tx_msg.ksm_zc_cookies[0] = cookie;
+ }
+
+ if (tx->tx_msg.ksm_zc_cookies[0] - tx->tx_msg.ksm_zc_cookies[1] > 2) {
+ /* not likely to carry more ACKs, skip it to simplify logic */
+ ksocknal_next_tx_carrier(conn);
+ }
+
+ return 1;
+ }
+
+ /* takes two or more cookies already */
+
+ if (tx->tx_msg.ksm_zc_cookies[0] > tx->tx_msg.ksm_zc_cookies[1]) {
+ __u64 tmp = 0;
+
+ /* two seperated cookies: (a+2, a) or (a+1, a) */
+ LASSERT (tx->tx_msg.ksm_zc_cookies[0] -
+ tx->tx_msg.ksm_zc_cookies[1] <= 2);
+
+ if (tx->tx_msg.ksm_zc_cookies[0] -
+ tx->tx_msg.ksm_zc_cookies[1] == 2) {
+ if (cookie == tx->tx_msg.ksm_zc_cookies[1] + 1)
+ tmp = cookie;
+ } else if (cookie == tx->tx_msg.ksm_zc_cookies[1] - 1) {
+ tmp = tx->tx_msg.ksm_zc_cookies[1];
+ } else if (cookie == tx->tx_msg.ksm_zc_cookies[0] + 1) {
+ tmp = tx->tx_msg.ksm_zc_cookies[0];
+ }
+
+ if (tmp != 0) {
+ /* range of cookies */
+ tx->tx_msg.ksm_zc_cookies[0] = tmp - 1;
+ tx->tx_msg.ksm_zc_cookies[1] = tmp + 1;
+ return 1;
+ }
+
+ } else {
+ /* ksm_zc_cookies[0] < ksm_zc_cookies[1], it is range of cookies */
+ if (cookie >= tx->tx_msg.ksm_zc_cookies[0] &&
+ cookie <= tx->tx_msg.ksm_zc_cookies[1]) {
+ CWARN("%s: duplicated ZC cookie: "LPU64"\n",
+ libcfs_id2str(conn->ksnc_peer->ksnp_id), cookie);
+ return 1; /* XXX: return error in the future */
+ }
+
+ if (cookie == tx->tx_msg.ksm_zc_cookies[1] + 1) {
+ tx->tx_msg.ksm_zc_cookies[1] = cookie;
+ return 1;
+ }
+
+ if (cookie == tx->tx_msg.ksm_zc_cookies[0] - 1) {
+ tx->tx_msg.ksm_zc_cookies[0] = cookie;
+ return 1;
+ }
+ }
+
+ /* failed to piggyback ZC-ACK */
+ if (tx_ack != NULL) {
+ list_add_tail(&tx_ack->tx_list, &conn->ksnc_tx_queue);
+ /* the next tx can piggyback at least 1 ACK */
+ ksocknal_next_tx_carrier(conn);
+ }
+
+ return 0;
+}
+
+static int
+ksocknal_match_tx(ksock_conn_t *conn, ksock_tx_t *tx, int nonblk)
+{
+ int nob;
+
+#if SOCKNAL_VERSION_DEBUG
+ if (!*ksocknal_tunables.ksnd_typed_conns)
+ return SOCKNAL_MATCH_YES;
+#endif
+
+ if (tx == NULL || tx->tx_lnetmsg == NULL) {
+ /* noop packet */
+ nob = offsetof(ksock_msg_t, ksm_u);
+ } else {
+ nob = tx->tx_lnetmsg->msg_len +
+ ((conn->ksnc_proto == &ksocknal_protocol_v1x) ?
+ sizeof(lnet_hdr_t) : sizeof(ksock_msg_t));
+ }
+
+ /* default checking for typed connection */
+ switch (conn->ksnc_type) {
+ default:
+ CERROR("ksnc_type bad: %u\n", conn->ksnc_type);
+ LBUG();
+ case SOCKLND_CONN_ANY:
+ return SOCKNAL_MATCH_YES;
+
+ case SOCKLND_CONN_BULK_IN:
+ return SOCKNAL_MATCH_MAY;
+
+ case SOCKLND_CONN_BULK_OUT:
+ if (nob < *ksocknal_tunables.ksnd_min_bulk)
+ return SOCKNAL_MATCH_MAY;
+ else
+ return SOCKNAL_MATCH_YES;
+
+ case SOCKLND_CONN_CONTROL:
+ if (nob >= *ksocknal_tunables.ksnd_min_bulk)
+ return SOCKNAL_MATCH_MAY;
+ else
+ return SOCKNAL_MATCH_YES;
+ }
+}
+
+static int
+ksocknal_match_tx_v3(ksock_conn_t *conn, ksock_tx_t *tx, int nonblk)
+{
+ int nob;
+
+ if (tx == NULL || tx->tx_lnetmsg == NULL)
+ nob = offsetof(ksock_msg_t, ksm_u);
+ else
+ nob = tx->tx_lnetmsg->msg_len + sizeof(ksock_msg_t);
+
+ switch (conn->ksnc_type) {
+ default:
+ CERROR("ksnc_type bad: %u\n", conn->ksnc_type);
+ LBUG();
+ case SOCKLND_CONN_ANY:
+ return SOCKNAL_MATCH_NO;
+
+ case SOCKLND_CONN_ACK:
+ if (nonblk)
+ return SOCKNAL_MATCH_YES;
+ else if (tx == NULL || tx->tx_lnetmsg == NULL)
+ return SOCKNAL_MATCH_MAY;
+ else
+ return SOCKNAL_MATCH_NO;
+
+ case SOCKLND_CONN_BULK_OUT:
+ if (nonblk)
+ return SOCKNAL_MATCH_NO;
+ else if (nob < *ksocknal_tunables.ksnd_min_bulk)
+ return SOCKNAL_MATCH_MAY;
+ else
+ return SOCKNAL_MATCH_YES;
+
+ case SOCKLND_CONN_CONTROL:
+ if (nonblk)
+ return SOCKNAL_MATCH_NO;
+ else if (nob >= *ksocknal_tunables.ksnd_min_bulk)
+ return SOCKNAL_MATCH_MAY;
+ else
+ return SOCKNAL_MATCH_YES;
+ }
+}
+
+/* (Sink) handle incoming ZC request from sender */
+static int
+ksocknal_handle_zcreq(ksock_conn_t *c, __u64 cookie, int remote)
+{
+ ksock_peer_t *peer = c->ksnc_peer;
+ ksock_conn_t *conn;
+ ksock_tx_t *tx;
+ int rc;
+
+ read_lock(&ksocknal_data.ksnd_global_lock);
+
+ conn = ksocknal_find_conn_locked(peer, NULL, !!remote);
+ if (conn != NULL) {
+ ksock_sched_t *sched = conn->ksnc_scheduler;
+
+ LASSERT(conn->ksnc_proto->pro_queue_tx_zcack != NULL);
+
+ spin_lock_bh(&sched->kss_lock);
+
+ rc = conn->ksnc_proto->pro_queue_tx_zcack(conn, NULL, cookie);
+
+ spin_unlock_bh(&sched->kss_lock);
+
+ if (rc) { /* piggybacked */
+ read_unlock(&ksocknal_data.ksnd_global_lock);
+ return 0;
+ }
+ }
+
+ read_unlock(&ksocknal_data.ksnd_global_lock);
+
+ /* ACK connection is not ready, or can't piggyback the ACK */
+ tx = ksocknal_alloc_tx_noop(cookie, !!remote);
+ if (tx == NULL)
+ return -ENOMEM;
+
+ if ((rc = ksocknal_launch_packet(peer->ksnp_ni, tx, peer->ksnp_id)) == 0)
+ return 0;
+
+ ksocknal_free_tx(tx);
+ return rc;
+}
+
+/* (Sender) handle ZC_ACK from sink */
+static int
+ksocknal_handle_zcack(ksock_conn_t *conn, __u64 cookie1, __u64 cookie2)
+{
+ ksock_peer_t *peer = conn->ksnc_peer;
+ ksock_tx_t *tx;
+ ksock_tx_t *tmp;
+ LIST_HEAD (zlist);
+ int count;
+
+ if (cookie1 == 0)
+ cookie1 = cookie2;
+
+ count = (cookie1 > cookie2) ? 2 : (cookie2 - cookie1 + 1);
+
+ if (cookie2 == SOCKNAL_KEEPALIVE_PING &&
+ conn->ksnc_proto == &ksocknal_protocol_v3x) {
+ /* keepalive PING for V3.x, just ignore it */
+ return count == 1 ? 0 : -EPROTO;
+ }
+
+ spin_lock(&peer->ksnp_lock);
+
+ list_for_each_entry_safe(tx, tmp,
+ &peer->ksnp_zc_req_list, tx_zc_list) {
+ __u64 c = tx->tx_msg.ksm_zc_cookies[0];
+
+ if (c == cookie1 || c == cookie2 || (cookie1 < c && c < cookie2)) {
+ tx->tx_msg.ksm_zc_cookies[0] = 0;
+ list_del(&tx->tx_zc_list);
+ list_add(&tx->tx_zc_list, &zlist);
+
+ if (--count == 0)
+ break;
+ }
+ }
+
+ spin_unlock(&peer->ksnp_lock);
+
+ while (!list_empty(&zlist)) {
+ tx = list_entry(zlist.next, ksock_tx_t, tx_zc_list);
+ list_del(&tx->tx_zc_list);
+ ksocknal_tx_decref(tx);
+ }
+
+ return count == 0 ? 0 : -EPROTO;
+}
+
+static int
+ksocknal_send_hello_v1 (ksock_conn_t *conn, ksock_hello_msg_t *hello)
+{
+ socket_t *sock = conn->ksnc_sock;
+ lnet_hdr_t *hdr;
+ lnet_magicversion_t *hmv;
+ int rc;
+ int i;
+
+ CLASSERT(sizeof(lnet_magicversion_t) == offsetof(lnet_hdr_t, src_nid));
+
+ LIBCFS_ALLOC(hdr, sizeof(*hdr));
+ if (hdr == NULL) {
+ CERROR("Can't allocate lnet_hdr_t\n");
+ return -ENOMEM;
+ }
+
+ hmv = (lnet_magicversion_t *)&hdr->dest_nid;
+
+ /* Re-organize V2.x message header to V1.x (lnet_hdr_t)
+ * header and send out */
+ hmv->magic = cpu_to_le32 (LNET_PROTO_TCP_MAGIC);
+ hmv->version_major = cpu_to_le16 (KSOCK_PROTO_V1_MAJOR);
+ hmv->version_minor = cpu_to_le16 (KSOCK_PROTO_V1_MINOR);
+
+ if (the_lnet.ln_testprotocompat != 0) {
+ /* single-shot proto check */
+ LNET_LOCK();
+ if ((the_lnet.ln_testprotocompat & 1) != 0) {
+ hmv->version_major++; /* just different! */
+ the_lnet.ln_testprotocompat &= ~1;
+ }
+ if ((the_lnet.ln_testprotocompat & 2) != 0) {
+ hmv->magic = LNET_PROTO_MAGIC;
+ the_lnet.ln_testprotocompat &= ~2;
+ }
+ LNET_UNLOCK();
+ }
+
+ hdr->src_nid = cpu_to_le64 (hello->kshm_src_nid);
+ hdr->src_pid = cpu_to_le32 (hello->kshm_src_pid);
+ hdr->type = cpu_to_le32 (LNET_MSG_HELLO);
+ hdr->payload_length = cpu_to_le32 (hello->kshm_nips * sizeof(__u32));
+ hdr->msg.hello.type = cpu_to_le32 (hello->kshm_ctype);
+ hdr->msg.hello.incarnation = cpu_to_le64 (hello->kshm_src_incarnation);
+
+ rc = libcfs_sock_write(sock, hdr, sizeof(*hdr),lnet_acceptor_timeout());
+
+ if (rc != 0) {
+ CNETERR("Error %d sending HELLO hdr to %u.%u.%u.%u/%d\n",
+ rc, HIPQUAD(conn->ksnc_ipaddr), conn->ksnc_port);
+ goto out;
+ }
+
+ if (hello->kshm_nips == 0)
+ goto out;
+
+ for (i = 0; i < (int) hello->kshm_nips; i++) {
+ hello->kshm_ips[i] = __cpu_to_le32 (hello->kshm_ips[i]);
+ }
+
+ rc = libcfs_sock_write(sock, hello->kshm_ips,
+ hello->kshm_nips * sizeof(__u32),
+ lnet_acceptor_timeout());
+ if (rc != 0) {
+ CNETERR("Error %d sending HELLO payload (%d)"
+ " to %u.%u.%u.%u/%d\n", rc, hello->kshm_nips,
+ HIPQUAD(conn->ksnc_ipaddr), conn->ksnc_port);
+ }
+out:
+ LIBCFS_FREE(hdr, sizeof(*hdr));
+
+ return rc;
+}
+
+static int
+ksocknal_send_hello_v2 (ksock_conn_t *conn, ksock_hello_msg_t *hello)
+{
+ socket_t *sock = conn->ksnc_sock;
+ int rc;
+
+ hello->kshm_magic = LNET_PROTO_MAGIC;
+ hello->kshm_version = conn->ksnc_proto->pro_version;
+
+ if (the_lnet.ln_testprotocompat != 0) {
+ /* single-shot proto check */
+ LNET_LOCK();
+ if ((the_lnet.ln_testprotocompat & 1) != 0) {
+ hello->kshm_version++; /* just different! */
+ the_lnet.ln_testprotocompat &= ~1;
+ }
+ LNET_UNLOCK();
+ }
+
+ rc = libcfs_sock_write(sock, hello, offsetof(ksock_hello_msg_t, kshm_ips),
+ lnet_acceptor_timeout());
+
+ if (rc != 0) {
+ CNETERR("Error %d sending HELLO hdr to %u.%u.%u.%u/%d\n",
+ rc, HIPQUAD(conn->ksnc_ipaddr), conn->ksnc_port);
+ return rc;
+ }
+
+ if (hello->kshm_nips == 0)
+ return 0;
+
+ rc = libcfs_sock_write(sock, hello->kshm_ips,
+ hello->kshm_nips * sizeof(__u32),
+ lnet_acceptor_timeout());
+ if (rc != 0) {
+ CNETERR("Error %d sending HELLO payload (%d)"
+ " to %u.%u.%u.%u/%d\n", rc, hello->kshm_nips,
+ HIPQUAD(conn->ksnc_ipaddr), conn->ksnc_port);
+ }
+
+ return rc;
+}
+
+static int
+ksocknal_recv_hello_v1(ksock_conn_t *conn, ksock_hello_msg_t *hello,int timeout)
+{
+ socket_t *sock = conn->ksnc_sock;
+ lnet_hdr_t *hdr;
+ int rc;
+ int i;
+
+ LIBCFS_ALLOC(hdr, sizeof(*hdr));
+ if (hdr == NULL) {
+ CERROR("Can't allocate lnet_hdr_t\n");
+ return -ENOMEM;
+ }
+
+ rc = libcfs_sock_read(sock, &hdr->src_nid,
+ sizeof (*hdr) - offsetof (lnet_hdr_t, src_nid),
+ timeout);
+ if (rc != 0) {
+ CERROR ("Error %d reading rest of HELLO hdr from %u.%u.%u.%u\n",
+ rc, HIPQUAD(conn->ksnc_ipaddr));
+ LASSERT (rc < 0 && rc != -EALREADY);
+ goto out;
+ }
+
+ /* ...and check we got what we expected */
+ if (hdr->type != cpu_to_le32 (LNET_MSG_HELLO)) {
+ CERROR ("Expecting a HELLO hdr,"
+ " but got type %d from %u.%u.%u.%u\n",
+ le32_to_cpu (hdr->type),
+ HIPQUAD(conn->ksnc_ipaddr));
+ rc = -EPROTO;
+ goto out;
+ }
+
+ hello->kshm_src_nid = le64_to_cpu (hdr->src_nid);
+ hello->kshm_src_pid = le32_to_cpu (hdr->src_pid);
+ hello->kshm_src_incarnation = le64_to_cpu (hdr->msg.hello.incarnation);
+ hello->kshm_ctype = le32_to_cpu (hdr->msg.hello.type);
+ hello->kshm_nips = le32_to_cpu (hdr->payload_length) /
+ sizeof (__u32);
+
+ if (hello->kshm_nips > LNET_MAX_INTERFACES) {
+ CERROR("Bad nips %d from ip %u.%u.%u.%u\n",
+ hello->kshm_nips, HIPQUAD(conn->ksnc_ipaddr));
+ rc = -EPROTO;
+ goto out;
+ }
+
+ if (hello->kshm_nips == 0)
+ goto out;
+
+ rc = libcfs_sock_read(sock, hello->kshm_ips,
+ hello->kshm_nips * sizeof(__u32), timeout);
+ if (rc != 0) {
+ CERROR ("Error %d reading IPs from ip %u.%u.%u.%u\n",
+ rc, HIPQUAD(conn->ksnc_ipaddr));
+ LASSERT (rc < 0 && rc != -EALREADY);
+ goto out;
+ }
+
+ for (i = 0; i < (int) hello->kshm_nips; i++) {
+ hello->kshm_ips[i] = __le32_to_cpu(hello->kshm_ips[i]);
+
+ if (hello->kshm_ips[i] == 0) {
+ CERROR("Zero IP[%d] from ip %u.%u.%u.%u\n",
+ i, HIPQUAD(conn->ksnc_ipaddr));
+ rc = -EPROTO;
+ break;
+ }
+ }
+out:
+ LIBCFS_FREE(hdr, sizeof(*hdr));
+
+ return rc;
+}
+
+static int
+ksocknal_recv_hello_v2 (ksock_conn_t *conn, ksock_hello_msg_t *hello, int timeout)
+{
+ socket_t *sock = conn->ksnc_sock;
+ int rc;
+ int i;
+
+ if (hello->kshm_magic == LNET_PROTO_MAGIC)
+ conn->ksnc_flip = 0;
+ else
+ conn->ksnc_flip = 1;
+
+ rc = libcfs_sock_read(sock, &hello->kshm_src_nid,
+ offsetof(ksock_hello_msg_t, kshm_ips) -
+ offsetof(ksock_hello_msg_t, kshm_src_nid),
+ timeout);
+ if (rc != 0) {
+ CERROR ("Error %d reading HELLO from %u.%u.%u.%u\n",
+ rc, HIPQUAD(conn->ksnc_ipaddr));
+ LASSERT (rc < 0 && rc != -EALREADY);
+ return rc;
+ }
+
+ if (conn->ksnc_flip) {
+ __swab32s(&hello->kshm_src_pid);
+ __swab64s(&hello->kshm_src_nid);
+ __swab32s(&hello->kshm_dst_pid);
+ __swab64s(&hello->kshm_dst_nid);
+ __swab64s(&hello->kshm_src_incarnation);
+ __swab64s(&hello->kshm_dst_incarnation);
+ __swab32s(&hello->kshm_ctype);
+ __swab32s(&hello->kshm_nips);
+ }
+
+ if (hello->kshm_nips > LNET_MAX_INTERFACES) {
+ CERROR("Bad nips %d from ip %u.%u.%u.%u\n",
+ hello->kshm_nips, HIPQUAD(conn->ksnc_ipaddr));
+ return -EPROTO;
+ }
+
+ if (hello->kshm_nips == 0)
+ return 0;
+
+ rc = libcfs_sock_read(sock, hello->kshm_ips,
+ hello->kshm_nips * sizeof(__u32), timeout);
+ if (rc != 0) {
+ CERROR ("Error %d reading IPs from ip %u.%u.%u.%u\n",
+ rc, HIPQUAD(conn->ksnc_ipaddr));
+ LASSERT (rc < 0 && rc != -EALREADY);
+ return rc;
+ }
+
+ for (i = 0; i < (int) hello->kshm_nips; i++) {
+ if (conn->ksnc_flip)
+ __swab32s(&hello->kshm_ips[i]);
+
+ if (hello->kshm_ips[i] == 0) {
+ CERROR("Zero IP[%d] from ip %u.%u.%u.%u\n",
+ i, HIPQUAD(conn->ksnc_ipaddr));
+ return -EPROTO;
+ }
+ }
+
+ return 0;
+}
+
+static void
+ksocknal_pack_msg_v1(ksock_tx_t *tx)
+{
+ /* V1.x has no KSOCK_MSG_NOOP */
+ LASSERT(tx->tx_msg.ksm_type != KSOCK_MSG_NOOP);
+ LASSERT(tx->tx_lnetmsg != NULL);
+
+ tx->tx_iov[0].iov_base = (void *)&tx->tx_lnetmsg->msg_hdr;
+ tx->tx_iov[0].iov_len = sizeof(lnet_hdr_t);
+
+ tx->tx_resid = tx->tx_nob = tx->tx_lnetmsg->msg_len + sizeof(lnet_hdr_t);
+}
+
+static void
+ksocknal_pack_msg_v2(ksock_tx_t *tx)
+{
+ tx->tx_iov[0].iov_base = (void *)&tx->tx_msg;
+
+ if (tx->tx_lnetmsg != NULL) {
+ LASSERT(tx->tx_msg.ksm_type != KSOCK_MSG_NOOP);
+
+ tx->tx_msg.ksm_u.lnetmsg.ksnm_hdr = tx->tx_lnetmsg->msg_hdr;
+ tx->tx_iov[0].iov_len = sizeof(ksock_msg_t);
+ tx->tx_resid = tx->tx_nob = sizeof(ksock_msg_t) + tx->tx_lnetmsg->msg_len;
+ } else {
+ LASSERT(tx->tx_msg.ksm_type == KSOCK_MSG_NOOP);
+
+ tx->tx_iov[0].iov_len = offsetof(ksock_msg_t, ksm_u.lnetmsg.ksnm_hdr);
+ tx->tx_resid = tx->tx_nob = offsetof(ksock_msg_t, ksm_u.lnetmsg.ksnm_hdr);
+ }
+ /* Don't checksum before start sending, because packet can be piggybacked with ACK */
+}
+
+static void
+ksocknal_unpack_msg_v1(ksock_msg_t *msg)
+{
+ msg->ksm_csum = 0;
+ msg->ksm_type = KSOCK_MSG_LNET;
+ msg->ksm_zc_cookies[0] = msg->ksm_zc_cookies[1] = 0;
+}
+
+static void
+ksocknal_unpack_msg_v2(ksock_msg_t *msg)
+{
+ return; /* Do nothing */
+}
+
+ksock_proto_t ksocknal_protocol_v1x =
+{
+ .pro_version = KSOCK_PROTO_V1,
+ .pro_send_hello = ksocknal_send_hello_v1,
+ .pro_recv_hello = ksocknal_recv_hello_v1,
+ .pro_pack = ksocknal_pack_msg_v1,
+ .pro_unpack = ksocknal_unpack_msg_v1,
+ .pro_queue_tx_msg = ksocknal_queue_tx_msg_v1,
+ .pro_handle_zcreq = NULL,
+ .pro_handle_zcack = NULL,
+ .pro_queue_tx_zcack = NULL,
+ .pro_match_tx = ksocknal_match_tx
+};
+
+ksock_proto_t ksocknal_protocol_v2x =
+{
+ .pro_version = KSOCK_PROTO_V2,
+ .pro_send_hello = ksocknal_send_hello_v2,
+ .pro_recv_hello = ksocknal_recv_hello_v2,
+ .pro_pack = ksocknal_pack_msg_v2,
+ .pro_unpack = ksocknal_unpack_msg_v2,
+ .pro_queue_tx_msg = ksocknal_queue_tx_msg_v2,
+ .pro_queue_tx_zcack = ksocknal_queue_tx_zcack_v2,
+ .pro_handle_zcreq = ksocknal_handle_zcreq,
+ .pro_handle_zcack = ksocknal_handle_zcack,
+ .pro_match_tx = ksocknal_match_tx
+};
+
+ksock_proto_t ksocknal_protocol_v3x =
+{
+ .pro_version = KSOCK_PROTO_V3,
+ .pro_send_hello = ksocknal_send_hello_v2,
+ .pro_recv_hello = ksocknal_recv_hello_v2,
+ .pro_pack = ksocknal_pack_msg_v2,
+ .pro_unpack = ksocknal_unpack_msg_v2,
+ .pro_queue_tx_msg = ksocknal_queue_tx_msg_v2,
+ .pro_queue_tx_zcack = ksocknal_queue_tx_zcack_v3,
+ .pro_handle_zcreq = ksocknal_handle_zcreq,
+ .pro_handle_zcack = ksocknal_handle_zcack,
+ .pro_match_tx = ksocknal_match_tx_v3
+};
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.