cregit-Linux how code gets into the kernel

Release 4.8 net/rds/ib_cm.c

Directory: net/rds
/*
 * Copyright (c) 2006 Oracle.  All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 */
#include <linux/kernel.h>
#include <linux/in.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/ratelimit.h>

#include "rds_single_path.h"
#include "rds.h"
#include "ib.h"

/*
 * Set the selected protocol version
 */

static void rds_ib_set_protocol(struct rds_connection *conn, unsigned int version) { conn->c_version = version; }

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/* * Set up flow control */
static void rds_ib_set_flow_control(struct rds_connection *conn, u32 credits) { struct rds_ib_connection *ic = conn->c_transport_data; if (rds_ib_sysctl_flow_control && credits != 0) { /* We're doing flow control */ ic->i_flowctl = 1; rds_ib_send_add_credits(conn, credits); } else { ic->i_flowctl = 0; } }

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/* * Tune RNR behavior. Without flow control, we use a rather * low timeout, but not the absolute minimum - this should * be tunable. * * We already set the RNR retry count to 7 (which is the * smallest infinite number :-) above. * If flow control is off, we want to change this back to 0 * so that we learn quickly when our credit accounting is * buggy. * * Caller passes in a qp_attr pointer - don't waste stack spacv * by allocation this twice. */
static void rds_ib_tune_rnr(struct rds_ib_connection *ic, struct ib_qp_attr *attr) { int ret; attr->min_rnr_timer = IB_RNR_TIMER_000_32; ret = ib_modify_qp(ic->i_cm_id->qp, attr, IB_QP_MIN_RNR_TIMER); if (ret) printk(KERN_NOTICE "ib_modify_qp(IB_QP_MIN_RNR_TIMER): err=%d\n", -ret); }

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/* * Connection established. * We get here for both outgoing and incoming connection. */
void rds_ib_cm_connect_complete(struct rds_connection *conn, struct rdma_cm_event *event) { const struct rds_ib_connect_private *dp = NULL; struct rds_ib_connection *ic = conn->c_transport_data; struct ib_qp_attr qp_attr; int err; if (event->param.conn.private_data_len >= sizeof(*dp)) { dp = event->param.conn.private_data; /* make sure it isn't empty data */ if (dp->dp_protocol_major) { rds_ib_set_protocol(conn, RDS_PROTOCOL(dp->dp_protocol_major, dp->dp_protocol_minor)); rds_ib_set_flow_control(conn, be32_to_cpu(dp->dp_credit)); } } if (conn->c_version < RDS_PROTOCOL(3, 1)) { printk(KERN_NOTICE "RDS/IB: Connection to %pI4 version %u.%u failed," " no longer supported\n", &conn->c_faddr, RDS_PROTOCOL_MAJOR(conn->c_version), RDS_PROTOCOL_MINOR(conn->c_version)); rds_conn_destroy(conn); return; } else { printk(KERN_NOTICE "RDS/IB: connected to %pI4 version %u.%u%s\n", &conn->c_faddr, RDS_PROTOCOL_MAJOR(conn->c_version), RDS_PROTOCOL_MINOR(conn->c_version), ic->i_flowctl ? ", flow control" : ""); } /* * Init rings and fill recv. this needs to wait until protocol negotiation * is complete, since ring layout is different from 3.0 to 3.1. */ rds_ib_send_init_ring(ic); rds_ib_recv_init_ring(ic); /* Post receive buffers - as a side effect, this will update * the posted credit count. */ rds_ib_recv_refill(conn, 1, GFP_KERNEL); /* Tune RNR behavior */ rds_ib_tune_rnr(ic, &qp_attr); qp_attr.qp_state = IB_QPS_RTS; err = ib_modify_qp(ic->i_cm_id->qp, &qp_attr, IB_QP_STATE); if (err) printk(KERN_NOTICE "ib_modify_qp(IB_QP_STATE, RTS): err=%d\n", err); /* update ib_device with this local ipaddr */ err = rds_ib_update_ipaddr(ic->rds_ibdev, conn->c_laddr); if (err) printk(KERN_ERR "rds_ib_update_ipaddr failed (%d)\n", err); /* If the peer gave us the last packet it saw, process this as if * we had received a regular ACK. */ if (dp) { /* dp structure start is not guaranteed to be 8 bytes aligned. * Since dp_ack_seq is 64-bit extended load operations can be * used so go through get_unaligned to avoid unaligned errors. */ __be64 dp_ack_seq = get_unaligned(&dp->dp_ack_seq); if (dp_ack_seq) rds_send_drop_acked(conn, be64_to_cpu(dp_ack_seq), NULL); } rds_connect_complete(conn); }

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shamir rabinovitchshamir rabinovitch144.42%110.00%
zach brownzach brown30.95%110.00%
santosh shilimkarsantosh shilimkar20.63%110.00%
david aherndavid ahern10.32%110.00%
Total317100.00%10100.00%


static void rds_ib_cm_fill_conn_param(struct rds_connection *conn, struct rdma_conn_param *conn_param, struct rds_ib_connect_private *dp, u32 protocol_version, u32 max_responder_resources, u32 max_initiator_depth) { struct rds_ib_connection *ic = conn->c_transport_data; struct rds_ib_device *rds_ibdev = ic->rds_ibdev; memset(conn_param, 0, sizeof(struct rdma_conn_param)); conn_param->responder_resources = min_t(u32, rds_ibdev->max_responder_resources, max_responder_resources); conn_param->initiator_depth = min_t(u32, rds_ibdev->max_initiator_depth, max_initiator_depth); conn_param->retry_count = min_t(unsigned int, rds_ib_retry_count, 7); conn_param->rnr_retry_count = 7; if (dp) { memset(dp, 0, sizeof(*dp)); dp->dp_saddr = conn->c_laddr; dp->dp_daddr = conn->c_faddr; dp->dp_protocol_major = RDS_PROTOCOL_MAJOR(protocol_version); dp->dp_protocol_minor = RDS_PROTOCOL_MINOR(protocol_version); dp->dp_protocol_minor_mask = cpu_to_be16(RDS_IB_SUPPORTED_PROTOCOLS); dp->dp_ack_seq = cpu_to_be64(rds_ib_piggyb_ack(ic)); /* Advertise flow control */ if (ic->i_flowctl) { unsigned int credits; credits = IB_GET_POST_CREDITS(atomic_read(&ic->i_credits)); dp->dp_credit = cpu_to_be32(credits); atomic_sub(IB_SET_POST_CREDITS(credits), &ic->i_credits); } conn_param->private_data = dp; conn_param->private_data_len = sizeof(*dp); } }

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qing huangqing huang31.21%120.00%
Total248100.00%5100.00%


static void rds_ib_cq_event_handler(struct ib_event *event, void *data) { rdsdebug("event %u (%s) data %p\n", event->event, ib_event_msg(event->event), data); }

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andy groverandy grover2575.76%133.33%
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sagi grimbergsagi grimberg13.03%133.33%
Total33100.00%3100.00%

/* Plucking the oldest entry from the ring can be done concurrently with * the thread refilling the ring. Each ring operation is protected by * spinlocks and the transient state of refilling doesn't change the * recording of which entry is oldest. * * This relies on IB only calling one cq comp_handler for each cq so that * there will only be one caller of rds_recv_incoming() per RDS connection. */
static void rds_ib_cq_comp_handler_recv(struct ib_cq *cq, void *context) { struct rds_connection *conn = context; struct rds_ib_connection *ic = conn->c_transport_data; rdsdebug("conn %p cq %p\n", conn, cq); rds_ib_stats_inc(s_ib_evt_handler_call); tasklet_schedule(&ic->i_recv_tasklet); }

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santosh shilimkarsantosh shilimkar53100.00%1100.00%
Total53100.00%1100.00%


static void poll_scq(struct rds_ib_connection *ic, struct ib_cq *cq, struct ib_wc *wcs) { int nr, i; struct ib_wc *wc; while ((nr = ib_poll_cq(cq, RDS_IB_WC_MAX, wcs)) > 0) { for (i = 0; i < nr; i++) { wc = wcs + i; rdsdebug("wc wr_id 0x%llx status %u byte_len %u imm_data %u\n", (unsigned long long)wc->wr_id, wc->status, wc->byte_len, be32_to_cpu(wc->ex.imm_data)); if (wc->wr_id <= ic->i_send_ring.w_nr || wc->wr_id == RDS_IB_ACK_WR_ID) rds_ib_send_cqe_handler(ic, wc); else rds_ib_mr_cqe_handler(ic, wc); } } }

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santosh shilimkarsantosh shilimkar10980.74%375.00%
avinash repakaavinash repaka2619.26%125.00%
Total135100.00%4100.00%


static void rds_ib_tasklet_fn_send(unsigned long data) { struct rds_ib_connection *ic = (struct rds_ib_connection *)data; struct rds_connection *conn = ic->conn; rds_ib_stats_inc(s_ib_tasklet_call); poll_scq(ic, ic->i_send_cq, ic->i_send_wc); ib_req_notify_cq(ic->i_send_cq, IB_CQ_NEXT_COMP); poll_scq(ic, ic->i_send_cq, ic->i_send_wc); if (rds_conn_up(conn) && (!test_bit(RDS_LL_SEND_FULL, &conn->c_flags) || test_bit(0, &conn->c_map_queued))) rds_send_xmit(&ic->conn->c_path[0]); }

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santosh shilimkarsantosh shilimkar10894.74%266.67%
sowmini varadhansowmini varadhan65.26%133.33%
Total114100.00%3100.00%


static void poll_rcq(struct rds_ib_connection *ic, struct ib_cq *cq, struct ib_wc *wcs, struct rds_ib_ack_state *ack_state) { int nr, i; struct ib_wc *wc; while ((nr = ib_poll_cq(cq, RDS_IB_WC_MAX, wcs)) > 0) { for (i = 0; i < nr; i++) { wc = wcs + i; rdsdebug("wc wr_id 0x%llx status %u byte_len %u imm_data %u\n", (unsigned long long)wc->wr_id, wc->status, wc->byte_len, be32_to_cpu(wc->ex.imm_data)); rds_ib_recv_cqe_handler(ic, wc, ack_state); } } }

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static void rds_ib_tasklet_fn_recv(unsigned long data) { struct rds_ib_connection *ic = (struct rds_ib_connection *)data; struct rds_connection *conn = ic->conn; struct rds_ib_device *rds_ibdev = ic->rds_ibdev; struct rds_ib_ack_state state; if (!rds_ibdev) rds_conn_drop(conn); rds_ib_stats_inc(s_ib_tasklet_call); memset(&state, 0, sizeof(state)); poll_rcq(ic, ic->i_recv_cq, ic->i_recv_wc, &state); ib_req_notify_cq(ic->i_recv_cq, IB_CQ_SOLICITED); poll_rcq(ic, ic->i_recv_cq, ic->i_recv_wc, &state); if (state.ack_next_valid) rds_ib_set_ack(ic, state.ack_next, state.ack_required); if (state.ack_recv_valid && state.ack_recv > ic->i_ack_recv) { rds_send_drop_acked(conn, state.ack_recv, NULL); ic->i_ack_recv = state.ack_recv; } if (rds_conn_up(conn)) rds_ib_attempt_ack(ic); }

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santosh shilimkarsantosh shilimkar179100.00%3100.00%
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static void rds_ib_qp_event_handler(struct ib_event *event, void *data) { struct rds_connection *conn = data; struct rds_ib_connection *ic = conn->c_transport_data; rdsdebug("conn %p ic %p event %u (%s)\n", conn, ic, event->event, ib_event_msg(event->event)); switch (event->event) { case IB_EVENT_COMM_EST: rdma_notify(ic->i_cm_id, IB_EVENT_COMM_EST); break; default: rdsdebug("Fatal QP Event %u (%s) " "- connection %pI4->%pI4, reconnecting\n", event->event, ib_event_msg(event->event), &conn->c_laddr, &conn->c_faddr); rds_conn_drop(conn); break; } }

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andy groverandy grover9084.91%360.00%
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sagi grimbergsagi grimberg21.89%120.00%
Total106100.00%5100.00%


static void rds_ib_cq_comp_handler_send(struct ib_cq *cq, void *context) { struct rds_connection *conn = context; struct rds_ib_connection *ic = conn->c_transport_data; rdsdebug("conn %p cq %p\n", conn, cq); rds_ib_stats_inc(s_ib_evt_handler_call); tasklet_schedule(&ic->i_send_tasklet); }

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santosh shilimkarsantosh shilimkar53100.00%1100.00%
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/* * This needs to be very careful to not leave IS_ERR pointers around for * cleanup to trip over. */
static int rds_ib_setup_qp(struct rds_connection *conn) { struct rds_ib_connection *ic = conn->c_transport_data; struct ib_device *dev = ic->i_cm_id->device; struct ib_qp_init_attr attr; struct ib_cq_init_attr cq_attr = {}; struct rds_ib_device *rds_ibdev; int ret, fr_queue_space; /* * It's normal to see a null device if an incoming connection races * with device removal, so we don't print a warning. */ rds_ibdev = rds_ib_get_client_data(dev); if (!rds_ibdev) return -EOPNOTSUPP; /* The fr_queue_space is currently set to 512, to add extra space on * completion queue and send queue. This extra space is used for FRMR * registration and invalidation work requests */ fr_queue_space = (rds_ibdev->use_fastreg ? RDS_IB_DEFAULT_FR_WR : 0); /* add the conn now so that connection establishment has the dev */ rds_ib_add_conn(rds_ibdev, conn); if (rds_ibdev->max_wrs < ic->i_send_ring.w_nr + 1) rds_ib_ring_resize(&ic->i_send_ring, rds_ibdev->max_wrs - 1); if (rds_ibdev->max_wrs < ic->i_recv_ring.w_nr + 1) rds_ib_ring_resize(&ic->i_recv_ring, rds_ibdev->max_wrs - 1); /* Protection domain and memory range */ ic->i_pd = rds_ibdev->pd; cq_attr.cqe = ic->i_send_ring.w_nr + fr_queue_space + 1; ic->i_send_cq = ib_create_cq(dev, rds_ib_cq_comp_handler_send, rds_ib_cq_event_handler, conn, &cq_attr); if (IS_ERR(ic->i_send_cq)) { ret = PTR_ERR(ic->i_send_cq); ic->i_send_cq = NULL; rdsdebug("ib_create_cq send failed: %d\n", ret); goto out; } cq_attr.cqe = ic->i_recv_ring.w_nr; ic->i_recv_cq = ib_create_cq(dev, rds_ib_cq_comp_handler_recv, rds_ib_cq_event_handler, conn, &cq_attr); if (IS_ERR(ic->i_recv_cq)) { ret = PTR_ERR(ic->i_recv_cq); ic->i_recv_cq = NULL; rdsdebug("ib_create_cq recv failed: %d\n", ret); goto out; } ret = ib_req_notify_cq(ic->i_send_cq, IB_CQ_NEXT_COMP); if (ret) { rdsdebug("ib_req_notify_cq send failed: %d\n", ret); goto out; } ret = ib_req_notify_cq(ic->i_recv_cq, IB_CQ_SOLICITED); if (ret) { rdsdebug("ib_req_notify_cq recv failed: %d\n", ret); goto out; } /* 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; }

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matan barakmatan barak324.23%110.00%
santosh shilimkarsantosh shilimkar314.10%330.00%
zach brownzach brown151.98%110.00%
joe perchesjoe perches20.26%110.00%
jason gunthorpejason gunthorpe10.13%110.00%
Total756100.00%10100.00%


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; }

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manuel zerpiesmanuel zerpies10.68%125.00%
Total147100.00%4100.00%


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; }

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andy groverandy grover43695.20%360.00%
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sowmini varadhansowmini varadhan40.87%120.00%
Total458100.00%5100.00%


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