diff options
Diffstat (limited to 'net/rds/ib_cm.c')
| -rw-r--r-- | net/rds/ib_cm.c | 1190 |
1 files changed, 1190 insertions, 0 deletions
diff --git a/net/rds/ib_cm.c b/net/rds/ib_cm.c new file mode 100644 index 000000000..bfbb31f0c --- /dev/null +++ b/net/rds/ib_cm.c @@ -0,0 +1,1190 @@ +/* + * Copyright (c) 2006, 2018 Oracle and/or its affiliates. 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 <net/addrconf.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; +} + +/* + * 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; + } +} + +/* + * 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); +} + +/* + * 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) +{ + struct rds_ib_connection *ic = conn->c_transport_data; + const union rds_ib_conn_priv *dp = NULL; + struct ib_qp_attr qp_attr; + __be64 ack_seq = 0; + __be32 credit = 0; + u8 major = 0; + u8 minor = 0; + int err; + + dp = event->param.conn.private_data; + if (conn->c_isv6) { + if (event->param.conn.private_data_len >= + sizeof(struct rds6_ib_connect_private)) { + major = dp->ricp_v6.dp_protocol_major; + minor = dp->ricp_v6.dp_protocol_minor; + credit = dp->ricp_v6.dp_credit; + /* 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. + */ + ack_seq = get_unaligned(&dp->ricp_v6.dp_ack_seq); + } + } else if (event->param.conn.private_data_len >= + sizeof(struct rds_ib_connect_private)) { + major = dp->ricp_v4.dp_protocol_major; + minor = dp->ricp_v4.dp_protocol_minor; + credit = dp->ricp_v4.dp_credit; + ack_seq = get_unaligned(&dp->ricp_v4.dp_ack_seq); + } + + /* make sure it isn't empty data */ + if (major) { + rds_ib_set_protocol(conn, RDS_PROTOCOL(major, minor)); + rds_ib_set_flow_control(conn, be32_to_cpu(credit)); + } + + if (conn->c_version < RDS_PROTOCOL(3, 1)) { + pr_notice("RDS/IB: Connection <%pI6c,%pI6c> version %u.%u no longer supported\n", + &conn->c_laddr, &conn->c_faddr, + RDS_PROTOCOL_MAJOR(conn->c_version), + RDS_PROTOCOL_MINOR(conn->c_version)); + set_bit(RDS_DESTROY_PENDING, &conn->c_path[0].cp_flags); + rds_conn_destroy(conn); + return; + } else { + pr_notice("RDS/IB: %s conn connected <%pI6c,%pI6c> version %u.%u%s\n", + ic->i_active_side ? "Active" : "Passive", + &conn->c_laddr, &conn->c_faddr, + RDS_PROTOCOL_MAJOR(conn->c_version), + RDS_PROTOCOL_MINOR(conn->c_version), + ic->i_flowctl ? ", flow control" : ""); + } + + atomic_set(&ic->i_cq_quiesce, 0); + + /* Init rings and fill recv. this needs to wait until protocol + * negotiation is complete, since ring layout is different + * from 3.1 to 4.1. + */ + 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) { + if (ack_seq) + rds_send_drop_acked(conn, be64_to_cpu(ack_seq), + NULL); + } + + rds_connect_complete(conn); +} + +static void rds_ib_cm_fill_conn_param(struct rds_connection *conn, + struct rdma_conn_param *conn_param, + union rds_ib_conn_priv *dp, + u32 protocol_version, + u32 max_responder_resources, + u32 max_initiator_depth, + bool isv6) +{ + 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)); + if (isv6) { + dp->ricp_v6.dp_saddr = conn->c_laddr; + dp->ricp_v6.dp_daddr = conn->c_faddr; + dp->ricp_v6.dp_protocol_major = + RDS_PROTOCOL_MAJOR(protocol_version); + dp->ricp_v6.dp_protocol_minor = + RDS_PROTOCOL_MINOR(protocol_version); + dp->ricp_v6.dp_protocol_minor_mask = + cpu_to_be16(RDS_IB_SUPPORTED_PROTOCOLS); + dp->ricp_v6.dp_ack_seq = + cpu_to_be64(rds_ib_piggyb_ack(ic)); + + conn_param->private_data = &dp->ricp_v6; + conn_param->private_data_len = sizeof(dp->ricp_v6); + } else { + dp->ricp_v4.dp_saddr = conn->c_laddr.s6_addr32[3]; + dp->ricp_v4.dp_daddr = conn->c_faddr.s6_addr32[3]; + dp->ricp_v4.dp_protocol_major = + RDS_PROTOCOL_MAJOR(protocol_version); + dp->ricp_v4.dp_protocol_minor = + RDS_PROTOCOL_MINOR(protocol_version); + dp->ricp_v4.dp_protocol_minor_mask = + cpu_to_be16(RDS_IB_SUPPORTED_PROTOCOLS); + dp->ricp_v4.dp_ack_seq = + cpu_to_be64(rds_ib_piggyb_ack(ic)); + + conn_param->private_data = &dp->ricp_v4; + conn_param->private_data_len = sizeof(dp->ricp_v4); + } + + /* Advertise flow control */ + if (ic->i_flowctl) { + unsigned int credits; + + credits = IB_GET_POST_CREDITS + (atomic_read(&ic->i_credits)); + if (isv6) + dp->ricp_v6.dp_credit = cpu_to_be32(credits); + else + dp->ricp_v4.dp_credit = cpu_to_be32(credits); + atomic_sub(IB_SET_POST_CREDITS(credits), + &ic->i_credits); + } + } +} + +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); +} + +/* 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); +} + +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); + + } + } +} + +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); + + /* if cq has been already reaped, ignore incoming cq event */ + if (atomic_read(&ic->i_cq_quiesce)) + return; + + 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]); +} + +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); + } + } +} + +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); + + /* if cq has been already reaped, ignore incoming cq event */ + if (atomic_read(&ic->i_cq_quiesce)) + return; + + 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); +} + +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 %pI6c->%pI6c, reconnecting\n", + event->event, ib_event_msg(event->event), + &conn->c_laddr, &conn->c_faddr); + rds_conn_drop(conn); + break; + } +} + +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); +} + +static inline int ibdev_get_unused_vector(struct rds_ib_device *rds_ibdev) +{ + int min = rds_ibdev->vector_load[rds_ibdev->dev->num_comp_vectors - 1]; + int index = rds_ibdev->dev->num_comp_vectors - 1; + int i; + + for (i = rds_ibdev->dev->num_comp_vectors - 1; i >= 0; i--) { + if (rds_ibdev->vector_load[i] < min) { + index = i; + min = rds_ibdev->vector_load[i]; + } + } + + rds_ibdev->vector_load[index]++; + return index; +} + +static inline void ibdev_put_vector(struct rds_ib_device *rds_ibdev, int index) +{ + rds_ibdev->vector_load[index]--; +} + +/* + * 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 + 1) + + (RDS_IB_DEFAULT_FR_INV_WR + 1) + : 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; + + ic->i_scq_vector = ibdev_get_unused_vector(rds_ibdev); + cq_attr.cqe = ic->i_send_ring.w_nr + fr_queue_space + 1; + cq_attr.comp_vector = ic->i_scq_vector; + 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; + ibdev_put_vector(rds_ibdev, ic->i_scq_vector); + rdsdebug("ib_create_cq send failed: %d\n", ret); + goto rds_ibdev_out; + } + + ic->i_rcq_vector = ibdev_get_unused_vector(rds_ibdev); + cq_attr.cqe = ic->i_recv_ring.w_nr; + cq_attr.comp_vector = ic->i_rcq_vector; + 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; + ibdev_put_vector(rds_ibdev, ic->i_rcq_vector); + rdsdebug("ib_create_cq recv failed: %d\n", ret); + goto send_cq_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 recv_cq_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 recv_cq_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); + atomic_set(&ic->i_fastunreg_wrs, RDS_IB_DEFAULT_FR_INV_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 recv_cq_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 qp_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 send_hdrs_dma_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 recv_hdrs_dma_out; + } + + ic->i_sends = vzalloc_node(array_size(sizeof(struct rds_ib_send_work), + ic->i_send_ring.w_nr), + ibdev_to_node(dev)); + if (!ic->i_sends) { + ret = -ENOMEM; + rdsdebug("send allocation failed\n"); + goto ack_dma_out; + } + + ic->i_recvs = vzalloc_node(array_size(sizeof(struct rds_ib_recv_work), + ic->i_recv_ring.w_nr), + ibdev_to_node(dev)); + if (!ic->i_recvs) { + ret = -ENOMEM; + rdsdebug("recv allocation failed\n"); + goto sends_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); + + goto out; + +sends_out: + vfree(ic->i_sends); +ack_dma_out: + ib_dma_free_coherent(dev, sizeof(struct rds_header), + ic->i_ack, ic->i_ack_dma); +recv_hdrs_dma_out: + ib_dma_free_coherent(dev, ic->i_recv_ring.w_nr * + sizeof(struct rds_header), + ic->i_recv_hdrs, ic->i_recv_hdrs_dma); +send_hdrs_dma_out: + ib_dma_free_coherent(dev, ic->i_send_ring.w_nr * + sizeof(struct rds_header), + ic->i_send_hdrs, ic->i_send_hdrs_dma); +qp_out: + rdma_destroy_qp(ic->i_cm_id); +recv_cq_out: + if (!ib_destroy_cq(ic->i_recv_cq)) + ic->i_recv_cq = NULL; +send_cq_out: + if (!ib_destroy_cq(ic->i_send_cq)) + ic->i_send_cq = NULL; +rds_ibdev_out: + rds_ib_remove_conn(rds_ibdev, conn); +out: + rds_ib_dev_put(rds_ibdev); + + return ret; +} + +static u32 rds_ib_protocol_compatible(struct rdma_cm_event *event, bool isv6) +{ + const union rds_ib_conn_priv *dp = event->param.conn.private_data; + u8 data_len, major, minor; + u32 version = 0; + __be16 mask; + u16 common; + + /* + * 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; + } + + if (isv6) { + data_len = sizeof(struct rds6_ib_connect_private); + major = dp->ricp_v6.dp_protocol_major; + minor = dp->ricp_v6.dp_protocol_minor; + mask = dp->ricp_v6.dp_protocol_minor_mask; + } else { + data_len = sizeof(struct rds_ib_connect_private); + major = dp->ricp_v4.dp_protocol_major; + minor = dp->ricp_v4.dp_protocol_minor; + mask = dp->ricp_v4.dp_protocol_minor_mask; + } + + /* Even if len is crap *now* I still want to check it. -ASG */ + if (event->param.conn.private_data_len < data_len || major == 0) + return RDS_PROTOCOL_3_0; + + common = be16_to_cpu(mask) & RDS_IB_SUPPORTED_PROTOCOLS; + if (major == 3 && common) { + version = RDS_PROTOCOL_3_0; + while ((common >>= 1) != 0) + version++; + } else { + if (isv6) + printk_ratelimited(KERN_NOTICE "RDS: Connection from %pI6c using incompatible protocol version %u.%u\n", + &dp->ricp_v6.dp_saddr, major, minor); + else + printk_ratelimited(KERN_NOTICE "RDS: Connection from %pI4 using incompatible protocol version %u.%u\n", + &dp->ricp_v4.dp_saddr, major, minor); + } + return version; +} + +#if IS_ENABLED(CONFIG_IPV6) +/* Given an IPv6 address, find the net_device which hosts that address and + * return its index. This is used by the rds_ib_cm_handle_connect() code to + * find the interface index of where an incoming request comes from when + * the request is using a link local address. + * + * Note one problem in this search. It is possible that two interfaces have + * the same link local address. Unfortunately, this cannot be solved unless + * the underlying layer gives us the interface which an incoming RDMA connect + * request comes from. + */ +static u32 __rds_find_ifindex(struct net *net, const struct in6_addr *addr) +{ + struct net_device *dev; + int idx = 0; + + rcu_read_lock(); + for_each_netdev_rcu(net, dev) { + if (ipv6_chk_addr(net, addr, dev, 1)) { + idx = dev->ifindex; + break; + } + } + rcu_read_unlock(); + + return idx; +} +#endif + +int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id, + struct rdma_cm_event *event, bool isv6) +{ + __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_conn_priv_cmn *dp_cmn; + struct rds_connection *conn = NULL; + struct rds_ib_connection *ic = NULL; + struct rdma_conn_param conn_param; + const union rds_ib_conn_priv *dp; + union rds_ib_conn_priv dp_rep; + struct in6_addr s_mapped_addr; + struct in6_addr d_mapped_addr; + const struct in6_addr *saddr6; + const struct in6_addr *daddr6; + int destroy = 1; + u32 ifindex = 0; + u32 version; + int err = 1; + + /* Check whether the remote protocol version matches ours. */ + version = rds_ib_protocol_compatible(event, isv6); + if (!version) + goto out; + + dp = event->param.conn.private_data; + if (isv6) { +#if IS_ENABLED(CONFIG_IPV6) + dp_cmn = &dp->ricp_v6.dp_cmn; + saddr6 = &dp->ricp_v6.dp_saddr; + daddr6 = &dp->ricp_v6.dp_daddr; + /* If either address is link local, need to find the + * interface index in order to create a proper RDS + * connection. + */ + if (ipv6_addr_type(daddr6) & IPV6_ADDR_LINKLOCAL) { + /* Using init_net for now .. */ + ifindex = __rds_find_ifindex(&init_net, daddr6); + /* No index found... Need to bail out. */ + if (ifindex == 0) { + err = -EOPNOTSUPP; + goto out; + } + } else if (ipv6_addr_type(saddr6) & IPV6_ADDR_LINKLOCAL) { + /* Use our address to find the correct index. */ + ifindex = __rds_find_ifindex(&init_net, daddr6); + /* No index found... Need to bail out. */ + if (ifindex == 0) { + err = -EOPNOTSUPP; + goto out; + } + } +#else + err = -EOPNOTSUPP; + goto out; +#endif + } else { + dp_cmn = &dp->ricp_v4.dp_cmn; + ipv6_addr_set_v4mapped(dp->ricp_v4.dp_saddr, &s_mapped_addr); + ipv6_addr_set_v4mapped(dp->ricp_v4.dp_daddr, &d_mapped_addr); + saddr6 = &s_mapped_addr; + daddr6 = &d_mapped_addr; + } + + rdsdebug("saddr %pI6c daddr %pI6c RDSv%u.%u lguid 0x%llx fguid " + "0x%llx\n", saddr6, daddr6, + 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, daddr6, saddr6, + &rds_ib_transport, GFP_KERNEL, ifindex); + 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_cmn->ricpc_credit)); + + /* If the peer gave us the last packet it saw, process this as if + * we had received a regular ACK. */ + if (dp_cmn->ricpc_ack_seq) + rds_send_drop_acked(conn, be64_to_cpu(dp_cmn->ricpc_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, isv6); + + /* rdma_accept() calls rdma_reject() internally if it fails */ + if (rdma_accept(cm_id, &conn_param)) + rds_ib_conn_error(conn, "rdma_accept failed\n"); + +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, bool isv6) +{ + struct rds_connection *conn = cm_id->context; + struct rds_ib_connection *ic = conn->c_transport_data; + struct rdma_conn_param conn_param; + union rds_ib_conn_priv 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, isv6); + 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; + } + ic->i_active_side = true; + return ret; +} + +int rds_ib_conn_path_connect(struct rds_conn_path *cp) +{ + struct rds_connection *conn = cp->cp_conn; + struct sockaddr_storage src, dest; + rdma_cm_event_handler handler; + struct rds_ib_connection *ic; + int ret; + + ic = conn->c_transport_data; + + /* XXX I wonder what affect the port space has */ + /* delegate cm event handler to rdma_transport */ +#if IS_ENABLED(CONFIG_IPV6) + if (conn->c_isv6) + handler = rds6_rdma_cm_event_handler; + else +#endif + handler = rds_rdma_cm_event_handler; + ic->i_cm_id = rdma_create_id(&init_net, 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); + + if (ipv6_addr_v4mapped(&conn->c_faddr)) { + struct sockaddr_in *sin; + + sin = (struct sockaddr_in *)&src; + sin->sin_family = AF_INET; + sin->sin_addr.s_addr = conn->c_laddr.s6_addr32[3]; + sin->sin_port = 0; + + sin = (struct sockaddr_in *)&dest; + sin->sin_family = AF_INET; + sin->sin_addr.s_addr = conn->c_faddr.s6_addr32[3]; + sin->sin_port = htons(RDS_PORT); + } else { + struct sockaddr_in6 *sin6; + + sin6 = (struct sockaddr_in6 *)&src; + sin6->sin6_family = AF_INET6; + sin6->sin6_addr = conn->c_laddr; + sin6->sin6_port = 0; + sin6->sin6_scope_id = conn->c_dev_if; + + sin6 = (struct sockaddr_in6 *)&dest; + sin6->sin6_family = AF_INET6; + sin6->sin6_addr = conn->c_faddr; + sin6->sin6_port = htons(RDS_CM_PORT); + sin6->sin6_scope_id = conn->c_dev_if; + } + + 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_path_shutdown(struct rds_conn_path *cp) +{ + struct rds_connection *conn = cp->cp_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) && + (atomic_read(&ic->i_fastunreg_wrs) == RDS_IB_DEFAULT_FR_INV_WR)); + tasklet_kill(&ic->i_send_tasklet); + tasklet_kill(&ic->i_recv_tasklet); + + atomic_set(&ic->i_cq_quiesce, 1); + + /* 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) { + if (ic->rds_ibdev) + ibdev_put_vector(ic->rds_ibdev, ic->i_scq_vector); + ib_destroy_cq(ic->i_send_cq); + } + + if (ic->i_recv_cq) { + if (ic->rds_ibdev) + ibdev_put_vector(ic->rds_ibdev, ic->i_rcq_vector); + 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; + ic->i_active_side = false; +} + +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, gfp); + 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); +} |