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1f9ecd7eac
Pass a struct rds_conn_path to rds_send_xmit so that MP capable transports can transmit packets on something other than c_path[0]. The eventual goal for MP capable transports is to hash the rds socket to a path based on the bound local address/port, and use this path as the argument to rds_send_xmit() Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
946 lines
27 KiB
C
946 lines
27 KiB
C
/*
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* Copyright (c) 2006 Oracle. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/in.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/ratelimit.h>
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#include "rds_single_path.h"
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#include "rds.h"
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#include "ib.h"
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/*
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* Set the selected protocol version
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*/
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static void rds_ib_set_protocol(struct rds_connection *conn, unsigned int version)
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{
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conn->c_version = version;
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}
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/*
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* Set up flow control
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*/
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static void rds_ib_set_flow_control(struct rds_connection *conn, u32 credits)
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{
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struct rds_ib_connection *ic = conn->c_transport_data;
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if (rds_ib_sysctl_flow_control && credits != 0) {
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/* We're doing flow control */
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ic->i_flowctl = 1;
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rds_ib_send_add_credits(conn, credits);
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} else {
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ic->i_flowctl = 0;
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}
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}
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/*
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* Tune RNR behavior. Without flow control, we use a rather
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* low timeout, but not the absolute minimum - this should
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* be tunable.
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*
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* We already set the RNR retry count to 7 (which is the
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* smallest infinite number :-) above.
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* If flow control is off, we want to change this back to 0
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* so that we learn quickly when our credit accounting is
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* buggy.
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*
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* Caller passes in a qp_attr pointer - don't waste stack spacv
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* by allocation this twice.
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*/
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static void
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rds_ib_tune_rnr(struct rds_ib_connection *ic, struct ib_qp_attr *attr)
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{
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int ret;
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attr->min_rnr_timer = IB_RNR_TIMER_000_32;
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ret = ib_modify_qp(ic->i_cm_id->qp, attr, IB_QP_MIN_RNR_TIMER);
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if (ret)
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printk(KERN_NOTICE "ib_modify_qp(IB_QP_MIN_RNR_TIMER): err=%d\n", -ret);
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}
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/*
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* Connection established.
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* We get here for both outgoing and incoming connection.
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*/
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void rds_ib_cm_connect_complete(struct rds_connection *conn, struct rdma_cm_event *event)
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{
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const struct rds_ib_connect_private *dp = NULL;
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struct rds_ib_connection *ic = conn->c_transport_data;
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struct ib_qp_attr qp_attr;
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int err;
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if (event->param.conn.private_data_len >= sizeof(*dp)) {
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dp = event->param.conn.private_data;
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/* make sure it isn't empty data */
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if (dp->dp_protocol_major) {
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rds_ib_set_protocol(conn,
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RDS_PROTOCOL(dp->dp_protocol_major,
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dp->dp_protocol_minor));
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rds_ib_set_flow_control(conn, be32_to_cpu(dp->dp_credit));
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}
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}
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if (conn->c_version < RDS_PROTOCOL(3,1)) {
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printk(KERN_NOTICE "RDS/IB: Connection to %pI4 version %u.%u failed,"
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" no longer supported\n",
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&conn->c_faddr,
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RDS_PROTOCOL_MAJOR(conn->c_version),
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RDS_PROTOCOL_MINOR(conn->c_version));
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rds_conn_destroy(conn);
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return;
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} else {
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printk(KERN_NOTICE "RDS/IB: connected to %pI4 version %u.%u%s\n",
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&conn->c_faddr,
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RDS_PROTOCOL_MAJOR(conn->c_version),
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RDS_PROTOCOL_MINOR(conn->c_version),
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ic->i_flowctl ? ", flow control" : "");
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}
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/*
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* Init rings and fill recv. this needs to wait until protocol negotiation
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* is complete, since ring layout is different from 3.0 to 3.1.
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*/
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rds_ib_send_init_ring(ic);
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rds_ib_recv_init_ring(ic);
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/* Post receive buffers - as a side effect, this will update
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* the posted credit count. */
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rds_ib_recv_refill(conn, 1, GFP_KERNEL);
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/* Tune RNR behavior */
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rds_ib_tune_rnr(ic, &qp_attr);
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qp_attr.qp_state = IB_QPS_RTS;
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err = ib_modify_qp(ic->i_cm_id->qp, &qp_attr, IB_QP_STATE);
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if (err)
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printk(KERN_NOTICE "ib_modify_qp(IB_QP_STATE, RTS): err=%d\n", err);
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/* update ib_device with this local ipaddr */
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err = rds_ib_update_ipaddr(ic->rds_ibdev, conn->c_laddr);
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if (err)
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printk(KERN_ERR "rds_ib_update_ipaddr failed (%d)\n",
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err);
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/* If the peer gave us the last packet it saw, process this as if
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* we had received a regular ACK. */
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if (dp) {
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/* dp structure start is not guaranteed to be 8 bytes aligned.
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* Since dp_ack_seq is 64-bit extended load operations can be
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* used so go through get_unaligned to avoid unaligned errors.
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*/
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__be64 dp_ack_seq = get_unaligned(&dp->dp_ack_seq);
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if (dp_ack_seq)
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rds_send_drop_acked(conn, be64_to_cpu(dp_ack_seq),
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NULL);
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}
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rds_connect_complete(conn);
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}
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static void rds_ib_cm_fill_conn_param(struct rds_connection *conn,
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struct rdma_conn_param *conn_param,
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struct rds_ib_connect_private *dp,
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u32 protocol_version,
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u32 max_responder_resources,
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u32 max_initiator_depth)
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{
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struct rds_ib_connection *ic = conn->c_transport_data;
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struct rds_ib_device *rds_ibdev = ic->rds_ibdev;
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memset(conn_param, 0, sizeof(struct rdma_conn_param));
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conn_param->responder_resources =
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min_t(u32, rds_ibdev->max_responder_resources, max_responder_resources);
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conn_param->initiator_depth =
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min_t(u32, rds_ibdev->max_initiator_depth, max_initiator_depth);
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conn_param->retry_count = min_t(unsigned int, rds_ib_retry_count, 7);
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conn_param->rnr_retry_count = 7;
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if (dp) {
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memset(dp, 0, sizeof(*dp));
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dp->dp_saddr = conn->c_laddr;
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dp->dp_daddr = conn->c_faddr;
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dp->dp_protocol_major = RDS_PROTOCOL_MAJOR(protocol_version);
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dp->dp_protocol_minor = RDS_PROTOCOL_MINOR(protocol_version);
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dp->dp_protocol_minor_mask = cpu_to_be16(RDS_IB_SUPPORTED_PROTOCOLS);
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dp->dp_ack_seq = cpu_to_be64(rds_ib_piggyb_ack(ic));
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/* Advertise flow control */
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if (ic->i_flowctl) {
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unsigned int credits;
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credits = IB_GET_POST_CREDITS(atomic_read(&ic->i_credits));
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dp->dp_credit = cpu_to_be32(credits);
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atomic_sub(IB_SET_POST_CREDITS(credits), &ic->i_credits);
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}
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conn_param->private_data = dp;
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conn_param->private_data_len = sizeof(*dp);
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}
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}
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static void rds_ib_cq_event_handler(struct ib_event *event, void *data)
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{
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rdsdebug("event %u (%s) data %p\n",
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event->event, ib_event_msg(event->event), data);
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}
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/* Plucking the oldest entry from the ring can be done concurrently with
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* the thread refilling the ring. Each ring operation is protected by
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* spinlocks and the transient state of refilling doesn't change the
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* recording of which entry is oldest.
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*
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* This relies on IB only calling one cq comp_handler for each cq so that
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* there will only be one caller of rds_recv_incoming() per RDS connection.
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*/
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static void rds_ib_cq_comp_handler_recv(struct ib_cq *cq, void *context)
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{
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struct rds_connection *conn = context;
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struct rds_ib_connection *ic = conn->c_transport_data;
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rdsdebug("conn %p cq %p\n", conn, cq);
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rds_ib_stats_inc(s_ib_evt_handler_call);
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tasklet_schedule(&ic->i_recv_tasklet);
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}
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static void poll_scq(struct rds_ib_connection *ic, struct ib_cq *cq,
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struct ib_wc *wcs)
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{
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int nr, i;
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struct ib_wc *wc;
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while ((nr = ib_poll_cq(cq, RDS_IB_WC_MAX, wcs)) > 0) {
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for (i = 0; i < nr; i++) {
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wc = wcs + i;
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rdsdebug("wc wr_id 0x%llx status %u byte_len %u imm_data %u\n",
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(unsigned long long)wc->wr_id, wc->status,
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wc->byte_len, be32_to_cpu(wc->ex.imm_data));
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if (wc->wr_id <= ic->i_send_ring.w_nr ||
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wc->wr_id == RDS_IB_ACK_WR_ID)
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rds_ib_send_cqe_handler(ic, wc);
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else
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rds_ib_mr_cqe_handler(ic, wc);
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}
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}
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}
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static void rds_ib_tasklet_fn_send(unsigned long data)
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{
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struct rds_ib_connection *ic = (struct rds_ib_connection *)data;
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struct rds_connection *conn = ic->conn;
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rds_ib_stats_inc(s_ib_tasklet_call);
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poll_scq(ic, ic->i_send_cq, ic->i_send_wc);
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ib_req_notify_cq(ic->i_send_cq, IB_CQ_NEXT_COMP);
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poll_scq(ic, ic->i_send_cq, ic->i_send_wc);
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if (rds_conn_up(conn) &&
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(!test_bit(RDS_LL_SEND_FULL, &conn->c_flags) ||
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test_bit(0, &conn->c_map_queued)))
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rds_send_xmit(&ic->conn->c_path[0]);
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}
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static void poll_rcq(struct rds_ib_connection *ic, struct ib_cq *cq,
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struct ib_wc *wcs,
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struct rds_ib_ack_state *ack_state)
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{
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int nr, i;
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struct ib_wc *wc;
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while ((nr = ib_poll_cq(cq, RDS_IB_WC_MAX, wcs)) > 0) {
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for (i = 0; i < nr; i++) {
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wc = wcs + i;
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rdsdebug("wc wr_id 0x%llx status %u byte_len %u imm_data %u\n",
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(unsigned long long)wc->wr_id, wc->status,
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wc->byte_len, be32_to_cpu(wc->ex.imm_data));
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rds_ib_recv_cqe_handler(ic, wc, ack_state);
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}
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}
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}
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static void rds_ib_tasklet_fn_recv(unsigned long data)
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{
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struct rds_ib_connection *ic = (struct rds_ib_connection *)data;
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struct rds_connection *conn = ic->conn;
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struct rds_ib_device *rds_ibdev = ic->rds_ibdev;
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struct rds_ib_ack_state state;
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if (!rds_ibdev)
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rds_conn_drop(conn);
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rds_ib_stats_inc(s_ib_tasklet_call);
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memset(&state, 0, sizeof(state));
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poll_rcq(ic, ic->i_recv_cq, ic->i_recv_wc, &state);
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ib_req_notify_cq(ic->i_recv_cq, IB_CQ_SOLICITED);
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poll_rcq(ic, ic->i_recv_cq, ic->i_recv_wc, &state);
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if (state.ack_next_valid)
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rds_ib_set_ack(ic, state.ack_next, state.ack_required);
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if (state.ack_recv_valid && state.ack_recv > ic->i_ack_recv) {
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rds_send_drop_acked(conn, state.ack_recv, NULL);
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ic->i_ack_recv = state.ack_recv;
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}
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if (rds_conn_up(conn))
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rds_ib_attempt_ack(ic);
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}
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static void rds_ib_qp_event_handler(struct ib_event *event, void *data)
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{
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struct rds_connection *conn = data;
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struct rds_ib_connection *ic = conn->c_transport_data;
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rdsdebug("conn %p ic %p event %u (%s)\n", conn, ic, event->event,
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ib_event_msg(event->event));
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switch (event->event) {
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case IB_EVENT_COMM_EST:
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rdma_notify(ic->i_cm_id, IB_EVENT_COMM_EST);
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break;
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default:
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rdsdebug("Fatal QP Event %u (%s) "
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"- connection %pI4->%pI4, reconnecting\n",
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event->event, ib_event_msg(event->event),
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&conn->c_laddr, &conn->c_faddr);
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rds_conn_drop(conn);
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break;
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}
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}
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static void rds_ib_cq_comp_handler_send(struct ib_cq *cq, void *context)
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{
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struct rds_connection *conn = context;
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struct rds_ib_connection *ic = conn->c_transport_data;
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rdsdebug("conn %p cq %p\n", conn, cq);
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rds_ib_stats_inc(s_ib_evt_handler_call);
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tasklet_schedule(&ic->i_send_tasklet);
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}
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|
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/*
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* This needs to be very careful to not leave IS_ERR pointers around for
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* cleanup to trip over.
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*/
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static int rds_ib_setup_qp(struct rds_connection *conn)
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{
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struct rds_ib_connection *ic = conn->c_transport_data;
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struct ib_device *dev = ic->i_cm_id->device;
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struct ib_qp_init_attr attr;
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struct ib_cq_init_attr cq_attr = {};
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struct rds_ib_device *rds_ibdev;
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int ret, fr_queue_space;
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|
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/*
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* It's normal to see a null device if an incoming connection races
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* with device removal, so we don't print a warning.
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*/
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rds_ibdev = rds_ib_get_client_data(dev);
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if (!rds_ibdev)
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return -EOPNOTSUPP;
|
|
|
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/* The fr_queue_space is currently set to 512, to add extra space on
|
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* completion queue and send queue. This extra space is used for FRMR
|
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* registration and invalidation work requests
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*/
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fr_queue_space = (rds_ibdev->use_fastreg ? RDS_IB_DEFAULT_FR_WR : 0);
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|
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/* add the conn now so that connection establishment has the dev */
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rds_ib_add_conn(rds_ibdev, conn);
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|
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if (rds_ibdev->max_wrs < ic->i_send_ring.w_nr + 1)
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rds_ib_ring_resize(&ic->i_send_ring, rds_ibdev->max_wrs - 1);
|
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if (rds_ibdev->max_wrs < ic->i_recv_ring.w_nr + 1)
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rds_ib_ring_resize(&ic->i_recv_ring, rds_ibdev->max_wrs - 1);
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|
|
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/* Protection domain and memory range */
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ic->i_pd = rds_ibdev->pd;
|
|
|
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cq_attr.cqe = ic->i_send_ring.w_nr + fr_queue_space + 1;
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|
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ic->i_send_cq = ib_create_cq(dev, rds_ib_cq_comp_handler_send,
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rds_ib_cq_event_handler, conn,
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&cq_attr);
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if (IS_ERR(ic->i_send_cq)) {
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ret = PTR_ERR(ic->i_send_cq);
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ic->i_send_cq = NULL;
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rdsdebug("ib_create_cq send failed: %d\n", ret);
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goto out;
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}
|
|
|
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cq_attr.cqe = ic->i_recv_ring.w_nr;
|
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ic->i_recv_cq = ib_create_cq(dev, rds_ib_cq_comp_handler_recv,
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rds_ib_cq_event_handler, conn,
|
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&cq_attr);
|
|
if (IS_ERR(ic->i_recv_cq)) {
|
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ret = PTR_ERR(ic->i_recv_cq);
|
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ic->i_recv_cq = NULL;
|
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rdsdebug("ib_create_cq recv failed: %d\n", ret);
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goto out;
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}
|
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|
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ret = ib_req_notify_cq(ic->i_send_cq, IB_CQ_NEXT_COMP);
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if (ret) {
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rdsdebug("ib_req_notify_cq send failed: %d\n", ret);
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goto out;
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}
|
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|
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ret = ib_req_notify_cq(ic->i_recv_cq, IB_CQ_SOLICITED);
|
|
if (ret) {
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rdsdebug("ib_req_notify_cq recv failed: %d\n", ret);
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goto out;
|
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}
|
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|
|
/* XXX negotiate max send/recv with remote? */
|
|
memset(&attr, 0, sizeof(attr));
|
|
attr.event_handler = rds_ib_qp_event_handler;
|
|
attr.qp_context = conn;
|
|
/* + 1 to allow for the single ack message */
|
|
attr.cap.max_send_wr = ic->i_send_ring.w_nr + fr_queue_space + 1;
|
|
attr.cap.max_recv_wr = ic->i_recv_ring.w_nr + 1;
|
|
attr.cap.max_send_sge = rds_ibdev->max_sge;
|
|
attr.cap.max_recv_sge = RDS_IB_RECV_SGE;
|
|
attr.sq_sig_type = IB_SIGNAL_REQ_WR;
|
|
attr.qp_type = IB_QPT_RC;
|
|
attr.send_cq = ic->i_send_cq;
|
|
attr.recv_cq = ic->i_recv_cq;
|
|
atomic_set(&ic->i_fastreg_wrs, RDS_IB_DEFAULT_FR_WR);
|
|
|
|
/*
|
|
* XXX this can fail if max_*_wr is too large? Are we supposed
|
|
* to back off until we get a value that the hardware can support?
|
|
*/
|
|
ret = rdma_create_qp(ic->i_cm_id, ic->i_pd, &attr);
|
|
if (ret) {
|
|
rdsdebug("rdma_create_qp failed: %d\n", ret);
|
|
goto out;
|
|
}
|
|
|
|
ic->i_send_hdrs = ib_dma_alloc_coherent(dev,
|
|
ic->i_send_ring.w_nr *
|
|
sizeof(struct rds_header),
|
|
&ic->i_send_hdrs_dma, GFP_KERNEL);
|
|
if (!ic->i_send_hdrs) {
|
|
ret = -ENOMEM;
|
|
rdsdebug("ib_dma_alloc_coherent send failed\n");
|
|
goto out;
|
|
}
|
|
|
|
ic->i_recv_hdrs = ib_dma_alloc_coherent(dev,
|
|
ic->i_recv_ring.w_nr *
|
|
sizeof(struct rds_header),
|
|
&ic->i_recv_hdrs_dma, GFP_KERNEL);
|
|
if (!ic->i_recv_hdrs) {
|
|
ret = -ENOMEM;
|
|
rdsdebug("ib_dma_alloc_coherent recv failed\n");
|
|
goto out;
|
|
}
|
|
|
|
ic->i_ack = ib_dma_alloc_coherent(dev, sizeof(struct rds_header),
|
|
&ic->i_ack_dma, GFP_KERNEL);
|
|
if (!ic->i_ack) {
|
|
ret = -ENOMEM;
|
|
rdsdebug("ib_dma_alloc_coherent ack failed\n");
|
|
goto out;
|
|
}
|
|
|
|
ic->i_sends = vzalloc_node(ic->i_send_ring.w_nr * sizeof(struct rds_ib_send_work),
|
|
ibdev_to_node(dev));
|
|
if (!ic->i_sends) {
|
|
ret = -ENOMEM;
|
|
rdsdebug("send allocation failed\n");
|
|
goto out;
|
|
}
|
|
|
|
ic->i_recvs = vzalloc_node(ic->i_recv_ring.w_nr * sizeof(struct rds_ib_recv_work),
|
|
ibdev_to_node(dev));
|
|
if (!ic->i_recvs) {
|
|
ret = -ENOMEM;
|
|
rdsdebug("recv allocation failed\n");
|
|
goto out;
|
|
}
|
|
|
|
rds_ib_recv_init_ack(ic);
|
|
|
|
rdsdebug("conn %p pd %p cq %p %p\n", conn, ic->i_pd,
|
|
ic->i_send_cq, ic->i_recv_cq);
|
|
|
|
out:
|
|
rds_ib_dev_put(rds_ibdev);
|
|
return ret;
|
|
}
|
|
|
|
static u32 rds_ib_protocol_compatible(struct rdma_cm_event *event)
|
|
{
|
|
const struct rds_ib_connect_private *dp = event->param.conn.private_data;
|
|
u16 common;
|
|
u32 version = 0;
|
|
|
|
/*
|
|
* rdma_cm private data is odd - when there is any private data in the
|
|
* request, we will be given a pretty large buffer without telling us the
|
|
* original size. The only way to tell the difference is by looking at
|
|
* the contents, which are initialized to zero.
|
|
* If the protocol version fields aren't set, this is a connection attempt
|
|
* from an older version. This could could be 3.0 or 2.0 - we can't tell.
|
|
* We really should have changed this for OFED 1.3 :-(
|
|
*/
|
|
|
|
/* Be paranoid. RDS always has privdata */
|
|
if (!event->param.conn.private_data_len) {
|
|
printk(KERN_NOTICE "RDS incoming connection has no private data, "
|
|
"rejecting\n");
|
|
return 0;
|
|
}
|
|
|
|
/* Even if len is crap *now* I still want to check it. -ASG */
|
|
if (event->param.conn.private_data_len < sizeof (*dp) ||
|
|
dp->dp_protocol_major == 0)
|
|
return RDS_PROTOCOL_3_0;
|
|
|
|
common = be16_to_cpu(dp->dp_protocol_minor_mask) & RDS_IB_SUPPORTED_PROTOCOLS;
|
|
if (dp->dp_protocol_major == 3 && common) {
|
|
version = RDS_PROTOCOL_3_0;
|
|
while ((common >>= 1) != 0)
|
|
version++;
|
|
} else
|
|
printk_ratelimited(KERN_NOTICE "RDS: Connection from %pI4 using incompatible protocol version %u.%u\n",
|
|
&dp->dp_saddr,
|
|
dp->dp_protocol_major,
|
|
dp->dp_protocol_minor);
|
|
return version;
|
|
}
|
|
|
|
int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
|
|
struct rdma_cm_event *event)
|
|
{
|
|
__be64 lguid = cm_id->route.path_rec->sgid.global.interface_id;
|
|
__be64 fguid = cm_id->route.path_rec->dgid.global.interface_id;
|
|
const struct rds_ib_connect_private *dp = event->param.conn.private_data;
|
|
struct rds_ib_connect_private dp_rep;
|
|
struct rds_connection *conn = NULL;
|
|
struct rds_ib_connection *ic = NULL;
|
|
struct rdma_conn_param conn_param;
|
|
u32 version;
|
|
int err = 1, destroy = 1;
|
|
|
|
/* Check whether the remote protocol version matches ours. */
|
|
version = rds_ib_protocol_compatible(event);
|
|
if (!version)
|
|
goto out;
|
|
|
|
rdsdebug("saddr %pI4 daddr %pI4 RDSv%u.%u lguid 0x%llx fguid "
|
|
"0x%llx\n", &dp->dp_saddr, &dp->dp_daddr,
|
|
RDS_PROTOCOL_MAJOR(version), RDS_PROTOCOL_MINOR(version),
|
|
(unsigned long long)be64_to_cpu(lguid),
|
|
(unsigned long long)be64_to_cpu(fguid));
|
|
|
|
/* RDS/IB is not currently netns aware, thus init_net */
|
|
conn = rds_conn_create(&init_net, dp->dp_daddr, dp->dp_saddr,
|
|
&rds_ib_transport, GFP_KERNEL);
|
|
if (IS_ERR(conn)) {
|
|
rdsdebug("rds_conn_create failed (%ld)\n", PTR_ERR(conn));
|
|
conn = NULL;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* The connection request may occur while the
|
|
* previous connection exist, e.g. in case of failover.
|
|
* But as connections may be initiated simultaneously
|
|
* by both hosts, we have a random backoff mechanism -
|
|
* see the comment above rds_queue_reconnect()
|
|
*/
|
|
mutex_lock(&conn->c_cm_lock);
|
|
if (!rds_conn_transition(conn, RDS_CONN_DOWN, RDS_CONN_CONNECTING)) {
|
|
if (rds_conn_state(conn) == RDS_CONN_UP) {
|
|
rdsdebug("incoming connect while connecting\n");
|
|
rds_conn_drop(conn);
|
|
rds_ib_stats_inc(s_ib_listen_closed_stale);
|
|
} else
|
|
if (rds_conn_state(conn) == RDS_CONN_CONNECTING) {
|
|
/* Wait and see - our connect may still be succeeding */
|
|
rds_ib_stats_inc(s_ib_connect_raced);
|
|
}
|
|
goto out;
|
|
}
|
|
|
|
ic = conn->c_transport_data;
|
|
|
|
rds_ib_set_protocol(conn, version);
|
|
rds_ib_set_flow_control(conn, be32_to_cpu(dp->dp_credit));
|
|
|
|
/* If the peer gave us the last packet it saw, process this as if
|
|
* we had received a regular ACK. */
|
|
if (dp->dp_ack_seq)
|
|
rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL);
|
|
|
|
BUG_ON(cm_id->context);
|
|
BUG_ON(ic->i_cm_id);
|
|
|
|
ic->i_cm_id = cm_id;
|
|
cm_id->context = conn;
|
|
|
|
/* We got halfway through setting up the ib_connection, if we
|
|
* fail now, we have to take the long route out of this mess. */
|
|
destroy = 0;
|
|
|
|
err = rds_ib_setup_qp(conn);
|
|
if (err) {
|
|
rds_ib_conn_error(conn, "rds_ib_setup_qp failed (%d)\n", err);
|
|
goto out;
|
|
}
|
|
|
|
rds_ib_cm_fill_conn_param(conn, &conn_param, &dp_rep, version,
|
|
event->param.conn.responder_resources,
|
|
event->param.conn.initiator_depth);
|
|
|
|
/* rdma_accept() calls rdma_reject() internally if it fails */
|
|
err = rdma_accept(cm_id, &conn_param);
|
|
if (err)
|
|
rds_ib_conn_error(conn, "rdma_accept failed (%d)\n", err);
|
|
|
|
out:
|
|
if (conn)
|
|
mutex_unlock(&conn->c_cm_lock);
|
|
if (err)
|
|
rdma_reject(cm_id, NULL, 0);
|
|
return destroy;
|
|
}
|
|
|
|
|
|
int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id)
|
|
{
|
|
struct rds_connection *conn = cm_id->context;
|
|
struct rds_ib_connection *ic = conn->c_transport_data;
|
|
struct rdma_conn_param conn_param;
|
|
struct rds_ib_connect_private dp;
|
|
int ret;
|
|
|
|
/* If the peer doesn't do protocol negotiation, we must
|
|
* default to RDSv3.0 */
|
|
rds_ib_set_protocol(conn, RDS_PROTOCOL_3_0);
|
|
ic->i_flowctl = rds_ib_sysctl_flow_control; /* advertise flow control */
|
|
|
|
ret = rds_ib_setup_qp(conn);
|
|
if (ret) {
|
|
rds_ib_conn_error(conn, "rds_ib_setup_qp failed (%d)\n", ret);
|
|
goto out;
|
|
}
|
|
|
|
rds_ib_cm_fill_conn_param(conn, &conn_param, &dp, RDS_PROTOCOL_VERSION,
|
|
UINT_MAX, UINT_MAX);
|
|
ret = rdma_connect(cm_id, &conn_param);
|
|
if (ret)
|
|
rds_ib_conn_error(conn, "rdma_connect failed (%d)\n", ret);
|
|
|
|
out:
|
|
/* Beware - returning non-zero tells the rdma_cm to destroy
|
|
* the cm_id. We should certainly not do it as long as we still
|
|
* "own" the cm_id. */
|
|
if (ret) {
|
|
if (ic->i_cm_id == cm_id)
|
|
ret = 0;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int rds_ib_conn_connect(struct rds_connection *conn)
|
|
{
|
|
struct rds_ib_connection *ic = conn->c_transport_data;
|
|
struct sockaddr_in src, dest;
|
|
int ret;
|
|
|
|
/* XXX I wonder what affect the port space has */
|
|
/* delegate cm event handler to rdma_transport */
|
|
ic->i_cm_id = rdma_create_id(&init_net, rds_rdma_cm_event_handler, conn,
|
|
RDMA_PS_TCP, IB_QPT_RC);
|
|
if (IS_ERR(ic->i_cm_id)) {
|
|
ret = PTR_ERR(ic->i_cm_id);
|
|
ic->i_cm_id = NULL;
|
|
rdsdebug("rdma_create_id() failed: %d\n", ret);
|
|
goto out;
|
|
}
|
|
|
|
rdsdebug("created cm id %p for conn %p\n", ic->i_cm_id, conn);
|
|
|
|
src.sin_family = AF_INET;
|
|
src.sin_addr.s_addr = (__force u32)conn->c_laddr;
|
|
src.sin_port = (__force u16)htons(0);
|
|
|
|
dest.sin_family = AF_INET;
|
|
dest.sin_addr.s_addr = (__force u32)conn->c_faddr;
|
|
dest.sin_port = (__force u16)htons(RDS_PORT);
|
|
|
|
ret = rdma_resolve_addr(ic->i_cm_id, (struct sockaddr *)&src,
|
|
(struct sockaddr *)&dest,
|
|
RDS_RDMA_RESOLVE_TIMEOUT_MS);
|
|
if (ret) {
|
|
rdsdebug("addr resolve failed for cm id %p: %d\n", ic->i_cm_id,
|
|
ret);
|
|
rdma_destroy_id(ic->i_cm_id);
|
|
ic->i_cm_id = NULL;
|
|
}
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* This is so careful about only cleaning up resources that were built up
|
|
* so that it can be called at any point during startup. In fact it
|
|
* can be called multiple times for a given connection.
|
|
*/
|
|
void rds_ib_conn_shutdown(struct rds_connection *conn)
|
|
{
|
|
struct rds_ib_connection *ic = conn->c_transport_data;
|
|
int err = 0;
|
|
|
|
rdsdebug("cm %p pd %p cq %p %p qp %p\n", ic->i_cm_id,
|
|
ic->i_pd, ic->i_send_cq, ic->i_recv_cq,
|
|
ic->i_cm_id ? ic->i_cm_id->qp : NULL);
|
|
|
|
if (ic->i_cm_id) {
|
|
struct ib_device *dev = ic->i_cm_id->device;
|
|
|
|
rdsdebug("disconnecting cm %p\n", ic->i_cm_id);
|
|
err = rdma_disconnect(ic->i_cm_id);
|
|
if (err) {
|
|
/* Actually this may happen quite frequently, when
|
|
* an outgoing connect raced with an incoming connect.
|
|
*/
|
|
rdsdebug("failed to disconnect, cm: %p err %d\n",
|
|
ic->i_cm_id, err);
|
|
}
|
|
|
|
/*
|
|
* We want to wait for tx and rx completion to finish
|
|
* before we tear down the connection, but we have to be
|
|
* careful not to get stuck waiting on a send ring that
|
|
* only has unsignaled sends in it. We've shutdown new
|
|
* sends before getting here so by waiting for signaled
|
|
* sends to complete we're ensured that there will be no
|
|
* more tx processing.
|
|
*/
|
|
wait_event(rds_ib_ring_empty_wait,
|
|
rds_ib_ring_empty(&ic->i_recv_ring) &&
|
|
(atomic_read(&ic->i_signaled_sends) == 0) &&
|
|
(atomic_read(&ic->i_fastreg_wrs) == RDS_IB_DEFAULT_FR_WR));
|
|
tasklet_kill(&ic->i_send_tasklet);
|
|
tasklet_kill(&ic->i_recv_tasklet);
|
|
|
|
/* first destroy the ib state that generates callbacks */
|
|
if (ic->i_cm_id->qp)
|
|
rdma_destroy_qp(ic->i_cm_id);
|
|
if (ic->i_send_cq)
|
|
ib_destroy_cq(ic->i_send_cq);
|
|
if (ic->i_recv_cq)
|
|
ib_destroy_cq(ic->i_recv_cq);
|
|
|
|
/* then free the resources that ib callbacks use */
|
|
if (ic->i_send_hdrs)
|
|
ib_dma_free_coherent(dev,
|
|
ic->i_send_ring.w_nr *
|
|
sizeof(struct rds_header),
|
|
ic->i_send_hdrs,
|
|
ic->i_send_hdrs_dma);
|
|
|
|
if (ic->i_recv_hdrs)
|
|
ib_dma_free_coherent(dev,
|
|
ic->i_recv_ring.w_nr *
|
|
sizeof(struct rds_header),
|
|
ic->i_recv_hdrs,
|
|
ic->i_recv_hdrs_dma);
|
|
|
|
if (ic->i_ack)
|
|
ib_dma_free_coherent(dev, sizeof(struct rds_header),
|
|
ic->i_ack, ic->i_ack_dma);
|
|
|
|
if (ic->i_sends)
|
|
rds_ib_send_clear_ring(ic);
|
|
if (ic->i_recvs)
|
|
rds_ib_recv_clear_ring(ic);
|
|
|
|
rdma_destroy_id(ic->i_cm_id);
|
|
|
|
/*
|
|
* Move connection back to the nodev list.
|
|
*/
|
|
if (ic->rds_ibdev)
|
|
rds_ib_remove_conn(ic->rds_ibdev, conn);
|
|
|
|
ic->i_cm_id = NULL;
|
|
ic->i_pd = NULL;
|
|
ic->i_send_cq = NULL;
|
|
ic->i_recv_cq = NULL;
|
|
ic->i_send_hdrs = NULL;
|
|
ic->i_recv_hdrs = NULL;
|
|
ic->i_ack = NULL;
|
|
}
|
|
BUG_ON(ic->rds_ibdev);
|
|
|
|
/* Clear pending transmit */
|
|
if (ic->i_data_op) {
|
|
struct rds_message *rm;
|
|
|
|
rm = container_of(ic->i_data_op, struct rds_message, data);
|
|
rds_message_put(rm);
|
|
ic->i_data_op = NULL;
|
|
}
|
|
|
|
/* Clear the ACK state */
|
|
clear_bit(IB_ACK_IN_FLIGHT, &ic->i_ack_flags);
|
|
#ifdef KERNEL_HAS_ATOMIC64
|
|
atomic64_set(&ic->i_ack_next, 0);
|
|
#else
|
|
ic->i_ack_next = 0;
|
|
#endif
|
|
ic->i_ack_recv = 0;
|
|
|
|
/* Clear flow control state */
|
|
ic->i_flowctl = 0;
|
|
atomic_set(&ic->i_credits, 0);
|
|
|
|
rds_ib_ring_init(&ic->i_send_ring, rds_ib_sysctl_max_send_wr);
|
|
rds_ib_ring_init(&ic->i_recv_ring, rds_ib_sysctl_max_recv_wr);
|
|
|
|
if (ic->i_ibinc) {
|
|
rds_inc_put(&ic->i_ibinc->ii_inc);
|
|
ic->i_ibinc = NULL;
|
|
}
|
|
|
|
vfree(ic->i_sends);
|
|
ic->i_sends = NULL;
|
|
vfree(ic->i_recvs);
|
|
ic->i_recvs = NULL;
|
|
}
|
|
|
|
int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp)
|
|
{
|
|
struct rds_ib_connection *ic;
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
/* XXX too lazy? */
|
|
ic = kzalloc(sizeof(struct rds_ib_connection), gfp);
|
|
if (!ic)
|
|
return -ENOMEM;
|
|
|
|
ret = rds_ib_recv_alloc_caches(ic);
|
|
if (ret) {
|
|
kfree(ic);
|
|
return ret;
|
|
}
|
|
|
|
INIT_LIST_HEAD(&ic->ib_node);
|
|
tasklet_init(&ic->i_send_tasklet, rds_ib_tasklet_fn_send,
|
|
(unsigned long)ic);
|
|
tasklet_init(&ic->i_recv_tasklet, rds_ib_tasklet_fn_recv,
|
|
(unsigned long)ic);
|
|
mutex_init(&ic->i_recv_mutex);
|
|
#ifndef KERNEL_HAS_ATOMIC64
|
|
spin_lock_init(&ic->i_ack_lock);
|
|
#endif
|
|
atomic_set(&ic->i_signaled_sends, 0);
|
|
|
|
/*
|
|
* rds_ib_conn_shutdown() waits for these to be emptied so they
|
|
* must be initialized before it can be called.
|
|
*/
|
|
rds_ib_ring_init(&ic->i_send_ring, rds_ib_sysctl_max_send_wr);
|
|
rds_ib_ring_init(&ic->i_recv_ring, rds_ib_sysctl_max_recv_wr);
|
|
|
|
ic->conn = conn;
|
|
conn->c_transport_data = ic;
|
|
|
|
spin_lock_irqsave(&ib_nodev_conns_lock, flags);
|
|
list_add_tail(&ic->ib_node, &ib_nodev_conns);
|
|
spin_unlock_irqrestore(&ib_nodev_conns_lock, flags);
|
|
|
|
|
|
rdsdebug("conn %p conn ic %p\n", conn, conn->c_transport_data);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Free a connection. Connection must be shut down and not set for reconnect.
|
|
*/
|
|
void rds_ib_conn_free(void *arg)
|
|
{
|
|
struct rds_ib_connection *ic = arg;
|
|
spinlock_t *lock_ptr;
|
|
|
|
rdsdebug("ic %p\n", ic);
|
|
|
|
/*
|
|
* Conn is either on a dev's list or on the nodev list.
|
|
* A race with shutdown() or connect() would cause problems
|
|
* (since rds_ibdev would change) but that should never happen.
|
|
*/
|
|
lock_ptr = ic->rds_ibdev ? &ic->rds_ibdev->spinlock : &ib_nodev_conns_lock;
|
|
|
|
spin_lock_irq(lock_ptr);
|
|
list_del(&ic->ib_node);
|
|
spin_unlock_irq(lock_ptr);
|
|
|
|
rds_ib_recv_free_caches(ic);
|
|
|
|
kfree(ic);
|
|
}
|
|
|
|
|
|
/*
|
|
* An error occurred on the connection
|
|
*/
|
|
void
|
|
__rds_ib_conn_error(struct rds_connection *conn, const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
|
|
rds_conn_drop(conn);
|
|
|
|
va_start(ap, fmt);
|
|
vprintk(fmt, ap);
|
|
va_end(ap);
|
|
}
|