diff options
Diffstat (limited to 'drivers/infiniband/sw/siw/siw_cm.c')
| -rw-r--r-- | drivers/infiniband/sw/siw/siw_cm.c | 1952 |
1 files changed, 1952 insertions, 0 deletions
diff --git a/drivers/infiniband/sw/siw/siw_cm.c b/drivers/infiniband/sw/siw/siw_cm.c new file mode 100644 index 000000000..df5f67599 --- /dev/null +++ b/drivers/infiniband/sw/siw/siw_cm.c @@ -0,0 +1,1952 @@ +// SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause + +/* Authors: Bernard Metzler <bmt@zurich.ibm.com> */ +/* Fredy Neeser */ +/* Greg Joyce <greg@opengridcomputing.com> */ +/* Copyright (c) 2008-2019, IBM Corporation */ +/* Copyright (c) 2017, Open Grid Computing, Inc. */ + +#include <linux/errno.h> +#include <linux/types.h> +#include <linux/net.h> +#include <linux/inetdevice.h> +#include <net/addrconf.h> +#include <linux/workqueue.h> +#include <net/sock.h> +#include <net/tcp.h> +#include <linux/inet.h> +#include <linux/tcp.h> + +#include <rdma/iw_cm.h> +#include <rdma/ib_verbs.h> +#include <rdma/ib_user_verbs.h> + +#include "siw.h" +#include "siw_cm.h" + +/* + * Set to any combination of + * MPA_V2_RDMA_NO_RTR, MPA_V2_RDMA_READ_RTR, MPA_V2_RDMA_WRITE_RTR + */ +static __be16 rtr_type = MPA_V2_RDMA_READ_RTR | MPA_V2_RDMA_WRITE_RTR; +static const bool relaxed_ird_negotiation = true; + +static void siw_cm_llp_state_change(struct sock *s); +static void siw_cm_llp_data_ready(struct sock *s); +static void siw_cm_llp_write_space(struct sock *s); +static void siw_cm_llp_error_report(struct sock *s); +static int siw_cm_upcall(struct siw_cep *cep, enum iw_cm_event_type reason, + int status); + +static void siw_sk_assign_cm_upcalls(struct sock *sk) +{ + write_lock_bh(&sk->sk_callback_lock); + sk->sk_state_change = siw_cm_llp_state_change; + sk->sk_data_ready = siw_cm_llp_data_ready; + sk->sk_write_space = siw_cm_llp_write_space; + sk->sk_error_report = siw_cm_llp_error_report; + write_unlock_bh(&sk->sk_callback_lock); +} + +static void siw_sk_save_upcalls(struct sock *sk) +{ + struct siw_cep *cep = sk_to_cep(sk); + + write_lock_bh(&sk->sk_callback_lock); + cep->sk_state_change = sk->sk_state_change; + cep->sk_data_ready = sk->sk_data_ready; + cep->sk_write_space = sk->sk_write_space; + cep->sk_error_report = sk->sk_error_report; + write_unlock_bh(&sk->sk_callback_lock); +} + +static void siw_sk_restore_upcalls(struct sock *sk, struct siw_cep *cep) +{ + sk->sk_state_change = cep->sk_state_change; + sk->sk_data_ready = cep->sk_data_ready; + sk->sk_write_space = cep->sk_write_space; + sk->sk_error_report = cep->sk_error_report; + sk->sk_user_data = NULL; +} + +static void siw_qp_socket_assoc(struct siw_cep *cep, struct siw_qp *qp) +{ + struct socket *s = cep->sock; + struct sock *sk = s->sk; + + write_lock_bh(&sk->sk_callback_lock); + + qp->attrs.sk = s; + sk->sk_data_ready = siw_qp_llp_data_ready; + sk->sk_write_space = siw_qp_llp_write_space; + + write_unlock_bh(&sk->sk_callback_lock); +} + +static void siw_socket_disassoc(struct socket *s) +{ + struct sock *sk = s->sk; + struct siw_cep *cep; + + if (sk) { + write_lock_bh(&sk->sk_callback_lock); + cep = sk_to_cep(sk); + if (cep) { + siw_sk_restore_upcalls(sk, cep); + siw_cep_put(cep); + } else { + pr_warn("siw: cannot restore sk callbacks: no ep\n"); + } + write_unlock_bh(&sk->sk_callback_lock); + } else { + pr_warn("siw: cannot restore sk callbacks: no sk\n"); + } +} + +static void siw_rtr_data_ready(struct sock *sk) +{ + struct siw_cep *cep; + struct siw_qp *qp = NULL; + read_descriptor_t rd_desc; + + read_lock(&sk->sk_callback_lock); + + cep = sk_to_cep(sk); + if (!cep) { + WARN(1, "No connection endpoint\n"); + goto out; + } + qp = sk_to_qp(sk); + + memset(&rd_desc, 0, sizeof(rd_desc)); + rd_desc.arg.data = qp; + rd_desc.count = 1; + + tcp_read_sock(sk, &rd_desc, siw_tcp_rx_data); + /* + * Check if first frame was successfully processed. + * Signal connection full establishment if yes. + * Failed data processing would have already scheduled + * connection drop. + */ + if (!qp->rx_stream.rx_suspend) + siw_cm_upcall(cep, IW_CM_EVENT_ESTABLISHED, 0); +out: + read_unlock(&sk->sk_callback_lock); + if (qp) + siw_qp_socket_assoc(cep, qp); +} + +static void siw_sk_assign_rtr_upcalls(struct siw_cep *cep) +{ + struct sock *sk = cep->sock->sk; + + write_lock_bh(&sk->sk_callback_lock); + sk->sk_data_ready = siw_rtr_data_ready; + sk->sk_write_space = siw_qp_llp_write_space; + write_unlock_bh(&sk->sk_callback_lock); +} + +static void siw_cep_socket_assoc(struct siw_cep *cep, struct socket *s) +{ + cep->sock = s; + siw_cep_get(cep); + s->sk->sk_user_data = cep; + + siw_sk_save_upcalls(s->sk); + siw_sk_assign_cm_upcalls(s->sk); +} + +static struct siw_cep *siw_cep_alloc(struct siw_device *sdev) +{ + struct siw_cep *cep = kzalloc(sizeof(*cep), GFP_KERNEL); + unsigned long flags; + + if (!cep) + return NULL; + + INIT_LIST_HEAD(&cep->listenq); + INIT_LIST_HEAD(&cep->devq); + INIT_LIST_HEAD(&cep->work_freelist); + + kref_init(&cep->ref); + cep->state = SIW_EPSTATE_IDLE; + init_waitqueue_head(&cep->waitq); + spin_lock_init(&cep->lock); + cep->sdev = sdev; + cep->enhanced_rdma_conn_est = false; + + spin_lock_irqsave(&sdev->lock, flags); + list_add_tail(&cep->devq, &sdev->cep_list); + spin_unlock_irqrestore(&sdev->lock, flags); + + siw_dbg_cep(cep, "new endpoint\n"); + return cep; +} + +static void siw_cm_free_work(struct siw_cep *cep) +{ + struct list_head *w, *tmp; + struct siw_cm_work *work; + + list_for_each_safe(w, tmp, &cep->work_freelist) { + work = list_entry(w, struct siw_cm_work, list); + list_del(&work->list); + kfree(work); + } +} + +static void siw_cancel_mpatimer(struct siw_cep *cep) +{ + spin_lock_bh(&cep->lock); + if (cep->mpa_timer) { + if (cancel_delayed_work(&cep->mpa_timer->work)) { + siw_cep_put(cep); + kfree(cep->mpa_timer); /* not needed again */ + } + cep->mpa_timer = NULL; + } + spin_unlock_bh(&cep->lock); +} + +static void siw_put_work(struct siw_cm_work *work) +{ + INIT_LIST_HEAD(&work->list); + spin_lock_bh(&work->cep->lock); + list_add(&work->list, &work->cep->work_freelist); + spin_unlock_bh(&work->cep->lock); +} + +static void siw_cep_set_inuse(struct siw_cep *cep) +{ + unsigned long flags; +retry: + spin_lock_irqsave(&cep->lock, flags); + + if (cep->in_use) { + spin_unlock_irqrestore(&cep->lock, flags); + wait_event_interruptible(cep->waitq, !cep->in_use); + if (signal_pending(current)) + flush_signals(current); + goto retry; + } else { + cep->in_use = 1; + spin_unlock_irqrestore(&cep->lock, flags); + } +} + +static void siw_cep_set_free(struct siw_cep *cep) +{ + unsigned long flags; + + spin_lock_irqsave(&cep->lock, flags); + cep->in_use = 0; + spin_unlock_irqrestore(&cep->lock, flags); + + wake_up(&cep->waitq); +} + +static void __siw_cep_dealloc(struct kref *ref) +{ + struct siw_cep *cep = container_of(ref, struct siw_cep, ref); + struct siw_device *sdev = cep->sdev; + unsigned long flags; + + WARN_ON(cep->listen_cep); + + /* kfree(NULL) is safe */ + kfree(cep->mpa.pdata); + spin_lock_bh(&cep->lock); + if (!list_empty(&cep->work_freelist)) + siw_cm_free_work(cep); + spin_unlock_bh(&cep->lock); + + spin_lock_irqsave(&sdev->lock, flags); + list_del(&cep->devq); + spin_unlock_irqrestore(&sdev->lock, flags); + + siw_dbg_cep(cep, "free endpoint\n"); + kfree(cep); +} + +static struct siw_cm_work *siw_get_work(struct siw_cep *cep) +{ + struct siw_cm_work *work = NULL; + + spin_lock_bh(&cep->lock); + if (!list_empty(&cep->work_freelist)) { + work = list_entry(cep->work_freelist.next, struct siw_cm_work, + list); + list_del_init(&work->list); + } + spin_unlock_bh(&cep->lock); + return work; +} + +static int siw_cm_alloc_work(struct siw_cep *cep, int num) +{ + struct siw_cm_work *work; + + while (num--) { + work = kmalloc(sizeof(*work), GFP_KERNEL); + if (!work) { + if (!(list_empty(&cep->work_freelist))) + siw_cm_free_work(cep); + return -ENOMEM; + } + work->cep = cep; + INIT_LIST_HEAD(&work->list); + list_add(&work->list, &cep->work_freelist); + } + return 0; +} + +/* + * siw_cm_upcall() + * + * Upcall to IWCM to inform about async connection events + */ +static int siw_cm_upcall(struct siw_cep *cep, enum iw_cm_event_type reason, + int status) +{ + struct iw_cm_event event; + struct iw_cm_id *id; + + memset(&event, 0, sizeof(event)); + event.status = status; + event.event = reason; + + if (reason == IW_CM_EVENT_CONNECT_REQUEST) { + event.provider_data = cep; + id = cep->listen_cep->cm_id; + } else { + id = cep->cm_id; + } + /* Signal IRD and ORD */ + if (reason == IW_CM_EVENT_ESTABLISHED || + reason == IW_CM_EVENT_CONNECT_REPLY) { + /* Signal negotiated IRD/ORD values we will use */ + event.ird = cep->ird; + event.ord = cep->ord; + } else if (reason == IW_CM_EVENT_CONNECT_REQUEST) { + event.ird = cep->ord; + event.ord = cep->ird; + } + /* Signal private data and address information */ + if (reason == IW_CM_EVENT_CONNECT_REQUEST || + reason == IW_CM_EVENT_CONNECT_REPLY) { + u16 pd_len = be16_to_cpu(cep->mpa.hdr.params.pd_len); + + if (pd_len) { + /* + * hand over MPA private data + */ + event.private_data_len = pd_len; + event.private_data = cep->mpa.pdata; + + /* Hide MPA V2 IRD/ORD control */ + if (cep->enhanced_rdma_conn_est) { + event.private_data_len -= + sizeof(struct mpa_v2_data); + event.private_data += + sizeof(struct mpa_v2_data); + } + } + getname_local(cep->sock, &event.local_addr); + getname_peer(cep->sock, &event.remote_addr); + } + siw_dbg_cep(cep, "[QP %u]: reason=%d, status=%d\n", + cep->qp ? qp_id(cep->qp) : UINT_MAX, reason, status); + + return id->event_handler(id, &event); +} + +/* + * siw_qp_cm_drop() + * + * Drops established LLP connection if present and not already + * scheduled for dropping. Called from user context, SQ workqueue + * or receive IRQ. Caller signals if socket can be immediately + * closed (basically, if not in IRQ). + */ +void siw_qp_cm_drop(struct siw_qp *qp, int schedule) +{ + struct siw_cep *cep = qp->cep; + + qp->rx_stream.rx_suspend = 1; + qp->tx_ctx.tx_suspend = 1; + + if (!qp->cep) + return; + + if (schedule) { + siw_cm_queue_work(cep, SIW_CM_WORK_CLOSE_LLP); + } else { + siw_cep_set_inuse(cep); + + if (cep->state == SIW_EPSTATE_CLOSED) { + siw_dbg_cep(cep, "already closed\n"); + goto out; + } + siw_dbg_cep(cep, "immediate close, state %d\n", cep->state); + + if (qp->term_info.valid) + siw_send_terminate(qp); + + if (cep->cm_id) { + switch (cep->state) { + case SIW_EPSTATE_AWAIT_MPAREP: + siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY, + -EINVAL); + break; + + case SIW_EPSTATE_RDMA_MODE: + siw_cm_upcall(cep, IW_CM_EVENT_CLOSE, 0); + break; + + case SIW_EPSTATE_IDLE: + case SIW_EPSTATE_LISTENING: + case SIW_EPSTATE_CONNECTING: + case SIW_EPSTATE_AWAIT_MPAREQ: + case SIW_EPSTATE_RECVD_MPAREQ: + case SIW_EPSTATE_CLOSED: + default: + break; + } + cep->cm_id->rem_ref(cep->cm_id); + cep->cm_id = NULL; + siw_cep_put(cep); + } + cep->state = SIW_EPSTATE_CLOSED; + + if (cep->sock) { + siw_socket_disassoc(cep->sock); + /* + * Immediately close socket + */ + sock_release(cep->sock); + cep->sock = NULL; + } + if (cep->qp) { + cep->qp = NULL; + siw_qp_put(qp); + } +out: + siw_cep_set_free(cep); + } +} + +void siw_cep_put(struct siw_cep *cep) +{ + WARN_ON(kref_read(&cep->ref) < 1); + kref_put(&cep->ref, __siw_cep_dealloc); +} + +void siw_cep_get(struct siw_cep *cep) +{ + kref_get(&cep->ref); +} + +/* + * Expects params->pd_len in host byte order + */ +static int siw_send_mpareqrep(struct siw_cep *cep, const void *pdata, u8 pd_len) +{ + struct socket *s = cep->sock; + struct mpa_rr *rr = &cep->mpa.hdr; + struct kvec iov[3]; + struct msghdr msg; + int rv; + int iovec_num = 0; + int mpa_len; + + memset(&msg, 0, sizeof(msg)); + + iov[iovec_num].iov_base = rr; + iov[iovec_num].iov_len = sizeof(*rr); + mpa_len = sizeof(*rr); + + if (cep->enhanced_rdma_conn_est) { + iovec_num++; + iov[iovec_num].iov_base = &cep->mpa.v2_ctrl; + iov[iovec_num].iov_len = sizeof(cep->mpa.v2_ctrl); + mpa_len += sizeof(cep->mpa.v2_ctrl); + } + if (pd_len) { + iovec_num++; + iov[iovec_num].iov_base = (char *)pdata; + iov[iovec_num].iov_len = pd_len; + mpa_len += pd_len; + } + if (cep->enhanced_rdma_conn_est) + pd_len += sizeof(cep->mpa.v2_ctrl); + + rr->params.pd_len = cpu_to_be16(pd_len); + + rv = kernel_sendmsg(s, &msg, iov, iovec_num + 1, mpa_len); + + return rv < 0 ? rv : 0; +} + +/* + * Receive MPA Request/Reply header. + * + * Returns 0 if complete MPA Request/Reply header including + * eventual private data was received. Returns -EAGAIN if + * header was partially received or negative error code otherwise. + * + * Context: May be called in process context only + */ +static int siw_recv_mpa_rr(struct siw_cep *cep) +{ + struct mpa_rr *hdr = &cep->mpa.hdr; + struct socket *s = cep->sock; + u16 pd_len; + int rcvd, to_rcv; + + if (cep->mpa.bytes_rcvd < sizeof(struct mpa_rr)) { + rcvd = ksock_recv(s, (char *)hdr + cep->mpa.bytes_rcvd, + sizeof(struct mpa_rr) - cep->mpa.bytes_rcvd, + 0); + if (rcvd <= 0) + return -ECONNABORTED; + + cep->mpa.bytes_rcvd += rcvd; + + if (cep->mpa.bytes_rcvd < sizeof(struct mpa_rr)) + return -EAGAIN; + + if (be16_to_cpu(hdr->params.pd_len) > MPA_MAX_PRIVDATA) + return -EPROTO; + } + pd_len = be16_to_cpu(hdr->params.pd_len); + + /* + * At least the MPA Request/Reply header (frame not including + * private data) has been received. + * Receive (or continue receiving) any private data. + */ + to_rcv = pd_len - (cep->mpa.bytes_rcvd - sizeof(struct mpa_rr)); + + if (!to_rcv) { + /* + * We must have hdr->params.pd_len == 0 and thus received a + * complete MPA Request/Reply frame. + * Check against peer protocol violation. + */ + u32 word; + + rcvd = ksock_recv(s, (char *)&word, sizeof(word), MSG_DONTWAIT); + if (rcvd == -EAGAIN) + return 0; + + if (rcvd == 0) { + siw_dbg_cep(cep, "peer EOF\n"); + return -EPIPE; + } + if (rcvd < 0) { + siw_dbg_cep(cep, "error: %d\n", rcvd); + return rcvd; + } + siw_dbg_cep(cep, "peer sent extra data: %d\n", rcvd); + + return -EPROTO; + } + + /* + * At this point, we must have hdr->params.pd_len != 0. + * A private data buffer gets allocated if hdr->params.pd_len != 0. + */ + if (!cep->mpa.pdata) { + cep->mpa.pdata = kmalloc(pd_len + 4, GFP_KERNEL); + if (!cep->mpa.pdata) + return -ENOMEM; + } + rcvd = ksock_recv( + s, cep->mpa.pdata + cep->mpa.bytes_rcvd - sizeof(struct mpa_rr), + to_rcv + 4, MSG_DONTWAIT); + + if (rcvd < 0) + return rcvd; + + if (rcvd > to_rcv) + return -EPROTO; + + cep->mpa.bytes_rcvd += rcvd; + + if (to_rcv == rcvd) { + siw_dbg_cep(cep, "%d bytes private data received\n", pd_len); + return 0; + } + return -EAGAIN; +} + +/* + * siw_proc_mpareq() + * + * Read MPA Request from socket and signal new connection to IWCM + * if success. Caller must hold lock on corresponding listening CEP. + */ +static int siw_proc_mpareq(struct siw_cep *cep) +{ + struct mpa_rr *req; + int version, rv; + u16 pd_len; + + rv = siw_recv_mpa_rr(cep); + if (rv) + return rv; + + req = &cep->mpa.hdr; + + version = __mpa_rr_revision(req->params.bits); + pd_len = be16_to_cpu(req->params.pd_len); + + if (version > MPA_REVISION_2) + /* allow for 0, 1, and 2 only */ + return -EPROTO; + + if (memcmp(req->key, MPA_KEY_REQ, 16)) + return -EPROTO; + + /* Prepare for sending MPA reply */ + memcpy(req->key, MPA_KEY_REP, 16); + + if (version == MPA_REVISION_2 && + (req->params.bits & MPA_RR_FLAG_ENHANCED)) { + /* + * MPA version 2 must signal IRD/ORD values and P2P mode + * in private data if header flag MPA_RR_FLAG_ENHANCED + * is set. + */ + if (pd_len < sizeof(struct mpa_v2_data)) + goto reject_conn; + + cep->enhanced_rdma_conn_est = true; + } + + /* MPA Markers: currently not supported. Marker TX to be added. */ + if (req->params.bits & MPA_RR_FLAG_MARKERS) + goto reject_conn; + + if (req->params.bits & MPA_RR_FLAG_CRC) { + /* + * RFC 5044, page 27: CRC MUST be used if peer requests it. + * siw specific: 'mpa_crc_strict' parameter to reject + * connection with CRC if local CRC off enforced by + * 'mpa_crc_strict' module parameter. + */ + if (!mpa_crc_required && mpa_crc_strict) + goto reject_conn; + + /* Enable CRC if requested by module parameter */ + if (mpa_crc_required) + req->params.bits |= MPA_RR_FLAG_CRC; + } + if (cep->enhanced_rdma_conn_est) { + struct mpa_v2_data *v2 = (struct mpa_v2_data *)cep->mpa.pdata; + + /* + * Peer requested ORD becomes requested local IRD, + * peer requested IRD becomes requested local ORD. + * IRD and ORD get limited by global maximum values. + */ + cep->ord = ntohs(v2->ird) & MPA_IRD_ORD_MASK; + cep->ord = min(cep->ord, SIW_MAX_ORD_QP); + cep->ird = ntohs(v2->ord) & MPA_IRD_ORD_MASK; + cep->ird = min(cep->ird, SIW_MAX_IRD_QP); + + /* May get overwritten by locally negotiated values */ + cep->mpa.v2_ctrl.ird = htons(cep->ird); + cep->mpa.v2_ctrl.ord = htons(cep->ord); + + /* + * Support for peer sent zero length Write or Read to + * let local side enter RTS. Writes are preferred. + * Sends would require pre-posting a Receive and are + * not supported. + * Propose zero length Write if none of Read and Write + * is indicated. + */ + if (v2->ird & MPA_V2_PEER_TO_PEER) { + cep->mpa.v2_ctrl.ird |= MPA_V2_PEER_TO_PEER; + + if (v2->ord & MPA_V2_RDMA_WRITE_RTR) + cep->mpa.v2_ctrl.ord |= MPA_V2_RDMA_WRITE_RTR; + else if (v2->ord & MPA_V2_RDMA_READ_RTR) + cep->mpa.v2_ctrl.ord |= MPA_V2_RDMA_READ_RTR; + else + cep->mpa.v2_ctrl.ord |= MPA_V2_RDMA_WRITE_RTR; + } + } + + cep->state = SIW_EPSTATE_RECVD_MPAREQ; + + /* Keep reference until IWCM accepts/rejects */ + siw_cep_get(cep); + rv = siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REQUEST, 0); + if (rv) + siw_cep_put(cep); + + return rv; + +reject_conn: + siw_dbg_cep(cep, "reject: crc %d:%d:%d, m %d:%d\n", + req->params.bits & MPA_RR_FLAG_CRC ? 1 : 0, + mpa_crc_required, mpa_crc_strict, + req->params.bits & MPA_RR_FLAG_MARKERS ? 1 : 0, 0); + + req->params.bits &= ~MPA_RR_FLAG_MARKERS; + req->params.bits |= MPA_RR_FLAG_REJECT; + + if (!mpa_crc_required && mpa_crc_strict) + req->params.bits &= ~MPA_RR_FLAG_CRC; + + if (pd_len) + kfree(cep->mpa.pdata); + + cep->mpa.pdata = NULL; + + siw_send_mpareqrep(cep, NULL, 0); + + return -EOPNOTSUPP; +} + +static int siw_proc_mpareply(struct siw_cep *cep) +{ + struct siw_qp_attrs qp_attrs; + enum siw_qp_attr_mask qp_attr_mask; + struct siw_qp *qp = cep->qp; + struct mpa_rr *rep; + int rv; + u16 rep_ord; + u16 rep_ird; + bool ird_insufficient = false; + enum mpa_v2_ctrl mpa_p2p_mode = MPA_V2_RDMA_NO_RTR; + + rv = siw_recv_mpa_rr(cep); + if (rv) + goto out_err; + + siw_cancel_mpatimer(cep); + + rep = &cep->mpa.hdr; + + if (__mpa_rr_revision(rep->params.bits) > MPA_REVISION_2) { + /* allow for 0, 1, and 2 only */ + rv = -EPROTO; + goto out_err; + } + if (memcmp(rep->key, MPA_KEY_REP, 16)) { + siw_init_terminate(qp, TERM_ERROR_LAYER_LLP, LLP_ETYPE_MPA, + LLP_ECODE_INVALID_REQ_RESP, 0); + siw_send_terminate(qp); + rv = -EPROTO; + goto out_err; + } + if (rep->params.bits & MPA_RR_FLAG_REJECT) { + siw_dbg_cep(cep, "got mpa reject\n"); + siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY, -ECONNRESET); + + return -ECONNRESET; + } + if (try_gso && rep->params.bits & MPA_RR_FLAG_GSO_EXP) { + siw_dbg_cep(cep, "peer allows GSO on TX\n"); + qp->tx_ctx.gso_seg_limit = 0; + } + if ((rep->params.bits & MPA_RR_FLAG_MARKERS) || + (mpa_crc_required && !(rep->params.bits & MPA_RR_FLAG_CRC)) || + (mpa_crc_strict && !mpa_crc_required && + (rep->params.bits & MPA_RR_FLAG_CRC))) { + siw_dbg_cep(cep, "reply unsupp: crc %d:%d:%d, m %d:%d\n", + rep->params.bits & MPA_RR_FLAG_CRC ? 1 : 0, + mpa_crc_required, mpa_crc_strict, + rep->params.bits & MPA_RR_FLAG_MARKERS ? 1 : 0, 0); + + siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY, -ECONNREFUSED); + + return -EINVAL; + } + if (cep->enhanced_rdma_conn_est) { + struct mpa_v2_data *v2; + + if (__mpa_rr_revision(rep->params.bits) < MPA_REVISION_2 || + !(rep->params.bits & MPA_RR_FLAG_ENHANCED)) { + /* + * Protocol failure: The responder MUST reply with + * MPA version 2 and MUST set MPA_RR_FLAG_ENHANCED. + */ + siw_dbg_cep(cep, "mpa reply error: vers %d, enhcd %d\n", + __mpa_rr_revision(rep->params.bits), + rep->params.bits & MPA_RR_FLAG_ENHANCED ? + 1 : + 0); + + siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY, + -ECONNRESET); + return -EINVAL; + } + v2 = (struct mpa_v2_data *)cep->mpa.pdata; + rep_ird = ntohs(v2->ird) & MPA_IRD_ORD_MASK; + rep_ord = ntohs(v2->ord) & MPA_IRD_ORD_MASK; + + if (cep->ird < rep_ord && + (relaxed_ird_negotiation == false || + rep_ord > cep->sdev->attrs.max_ird)) { + siw_dbg_cep(cep, "ird %d, rep_ord %d, max_ord %d\n", + cep->ird, rep_ord, + cep->sdev->attrs.max_ord); + ird_insufficient = true; + } + if (cep->ord > rep_ird && relaxed_ird_negotiation == false) { + siw_dbg_cep(cep, "ord %d, rep_ird %d\n", cep->ord, + rep_ird); + ird_insufficient = true; + } + /* + * Always report negotiated peer values to user, + * even if IRD/ORD negotiation failed + */ + cep->ird = rep_ord; + cep->ord = rep_ird; + + if (ird_insufficient) { + /* + * If the initiator IRD is insuffient for the + * responder ORD, send a TERM. + */ + siw_init_terminate(qp, TERM_ERROR_LAYER_LLP, + LLP_ETYPE_MPA, + LLP_ECODE_INSUFFICIENT_IRD, 0); + siw_send_terminate(qp); + rv = -ENOMEM; + goto out_err; + } + if (cep->mpa.v2_ctrl_req.ird & MPA_V2_PEER_TO_PEER) + mpa_p2p_mode = + cep->mpa.v2_ctrl_req.ord & + (MPA_V2_RDMA_WRITE_RTR | MPA_V2_RDMA_READ_RTR); + + /* + * Check if we requested P2P mode, and if peer agrees + */ + if (mpa_p2p_mode != MPA_V2_RDMA_NO_RTR) { + if ((mpa_p2p_mode & v2->ord) == 0) { + /* + * We requested RTR mode(s), but the peer + * did not pick any mode we support. + */ + siw_dbg_cep(cep, + "rtr mode: req %2x, got %2x\n", + mpa_p2p_mode, + v2->ord & (MPA_V2_RDMA_WRITE_RTR | + MPA_V2_RDMA_READ_RTR)); + + siw_init_terminate(qp, TERM_ERROR_LAYER_LLP, + LLP_ETYPE_MPA, + LLP_ECODE_NO_MATCHING_RTR, + 0); + siw_send_terminate(qp); + rv = -EPROTO; + goto out_err; + } + mpa_p2p_mode = v2->ord & (MPA_V2_RDMA_WRITE_RTR | + MPA_V2_RDMA_READ_RTR); + } + } + memset(&qp_attrs, 0, sizeof(qp_attrs)); + + if (rep->params.bits & MPA_RR_FLAG_CRC) + qp_attrs.flags = SIW_MPA_CRC; + + qp_attrs.irq_size = cep->ird; + qp_attrs.orq_size = cep->ord; + qp_attrs.sk = cep->sock; + qp_attrs.state = SIW_QP_STATE_RTS; + + qp_attr_mask = SIW_QP_ATTR_STATE | SIW_QP_ATTR_LLP_HANDLE | + SIW_QP_ATTR_ORD | SIW_QP_ATTR_IRD | SIW_QP_ATTR_MPA; + + /* Move socket RX/TX under QP control */ + down_write(&qp->state_lock); + if (qp->attrs.state > SIW_QP_STATE_RTR) { + rv = -EINVAL; + up_write(&qp->state_lock); + goto out_err; + } + rv = siw_qp_modify(qp, &qp_attrs, qp_attr_mask); + + siw_qp_socket_assoc(cep, qp); + + up_write(&qp->state_lock); + + /* Send extra RDMA frame to trigger peer RTS if negotiated */ + if (mpa_p2p_mode != MPA_V2_RDMA_NO_RTR) { + rv = siw_qp_mpa_rts(qp, mpa_p2p_mode); + if (rv) + goto out_err; + } + if (!rv) { + rv = siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY, 0); + if (!rv) + cep->state = SIW_EPSTATE_RDMA_MODE; + + return 0; + } + +out_err: + if (rv != -EAGAIN) + siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY, -EINVAL); + + return rv; +} + +/* + * siw_accept_newconn - accept an incoming pending connection + * + */ +static void siw_accept_newconn(struct siw_cep *cep) +{ + struct socket *s = cep->sock; + struct socket *new_s = NULL; + struct siw_cep *new_cep = NULL; + int rv = 0; /* debug only. should disappear */ + + if (cep->state != SIW_EPSTATE_LISTENING) + goto error; + + new_cep = siw_cep_alloc(cep->sdev); + if (!new_cep) + goto error; + + /* + * 4: Allocate a sufficient number of work elements + * to allow concurrent handling of local + peer close + * events, MPA header processing + MPA timeout. + */ + if (siw_cm_alloc_work(new_cep, 4) != 0) + goto error; + + /* + * Copy saved socket callbacks from listening CEP + * and assign new socket with new CEP + */ + new_cep->sk_state_change = cep->sk_state_change; + new_cep->sk_data_ready = cep->sk_data_ready; + new_cep->sk_write_space = cep->sk_write_space; + new_cep->sk_error_report = cep->sk_error_report; + + rv = kernel_accept(s, &new_s, O_NONBLOCK); + if (rv != 0) { + /* + * Connection already aborted by peer..? + */ + siw_dbg_cep(cep, "kernel_accept() error: %d\n", rv); + goto error; + } + new_cep->sock = new_s; + siw_cep_get(new_cep); + new_s->sk->sk_user_data = new_cep; + + if (siw_tcp_nagle == false) + tcp_sock_set_nodelay(new_s->sk); + new_cep->state = SIW_EPSTATE_AWAIT_MPAREQ; + + rv = siw_cm_queue_work(new_cep, SIW_CM_WORK_MPATIMEOUT); + if (rv) + goto error; + /* + * See siw_proc_mpareq() etc. for the use of new_cep->listen_cep. + */ + new_cep->listen_cep = cep; + siw_cep_get(cep); + + if (atomic_read(&new_s->sk->sk_rmem_alloc)) { + /* + * MPA REQ already queued + */ + siw_dbg_cep(cep, "immediate mpa request\n"); + + siw_cep_set_inuse(new_cep); + rv = siw_proc_mpareq(new_cep); + if (rv != -EAGAIN) { + siw_cep_put(cep); + new_cep->listen_cep = NULL; + if (rv) { + siw_cancel_mpatimer(new_cep); + siw_cep_set_free(new_cep); + goto error; + } + } + siw_cep_set_free(new_cep); + } + return; + +error: + if (new_cep) + siw_cep_put(new_cep); + + if (new_s) { + siw_socket_disassoc(new_s); + sock_release(new_s); + new_cep->sock = NULL; + } + siw_dbg_cep(cep, "error %d\n", rv); +} + +static void siw_cm_work_handler(struct work_struct *w) +{ + struct siw_cm_work *work; + struct siw_cep *cep; + int release_cep = 0, rv = 0; + + work = container_of(w, struct siw_cm_work, work.work); + cep = work->cep; + + siw_dbg_cep(cep, "[QP %u]: work type: %d, state %d\n", + cep->qp ? qp_id(cep->qp) : UINT_MAX, + work->type, cep->state); + + siw_cep_set_inuse(cep); + + switch (work->type) { + case SIW_CM_WORK_ACCEPT: + siw_accept_newconn(cep); + break; + + case SIW_CM_WORK_READ_MPAHDR: + if (cep->state == SIW_EPSTATE_AWAIT_MPAREQ) { + if (cep->listen_cep) { + siw_cep_set_inuse(cep->listen_cep); + + if (cep->listen_cep->state == + SIW_EPSTATE_LISTENING) + rv = siw_proc_mpareq(cep); + else + rv = -EFAULT; + + siw_cep_set_free(cep->listen_cep); + + if (rv != -EAGAIN) { + siw_cep_put(cep->listen_cep); + cep->listen_cep = NULL; + if (rv) + siw_cep_put(cep); + } + } + } else if (cep->state == SIW_EPSTATE_AWAIT_MPAREP) { + rv = siw_proc_mpareply(cep); + } else { + /* + * CEP already moved out of MPA handshake. + * any connection management already done. + * silently ignore the mpa packet. + */ + if (cep->state == SIW_EPSTATE_RDMA_MODE) { + cep->sock->sk->sk_data_ready(cep->sock->sk); + siw_dbg_cep(cep, "already in RDMA mode"); + } else { + siw_dbg_cep(cep, "out of state: %d\n", + cep->state); + } + } + if (rv && rv != EAGAIN) + release_cep = 1; + break; + + case SIW_CM_WORK_CLOSE_LLP: + /* + * QP scheduled LLP close + */ + if (cep->qp && cep->qp->term_info.valid) + siw_send_terminate(cep->qp); + + if (cep->cm_id) + siw_cm_upcall(cep, IW_CM_EVENT_CLOSE, 0); + + release_cep = 1; + break; + + case SIW_CM_WORK_PEER_CLOSE: + if (cep->cm_id) { + if (cep->state == SIW_EPSTATE_AWAIT_MPAREP) { + /* + * MPA reply not received, but connection drop + */ + siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY, + -ECONNRESET); + } else if (cep->state == SIW_EPSTATE_RDMA_MODE) { + /* + * NOTE: IW_CM_EVENT_DISCONNECT is given just + * to transition IWCM into CLOSING. + */ + siw_cm_upcall(cep, IW_CM_EVENT_DISCONNECT, 0); + siw_cm_upcall(cep, IW_CM_EVENT_CLOSE, 0); + } + /* + * for other states there is no connection + * known to the IWCM. + */ + } else { + if (cep->state == SIW_EPSTATE_RECVD_MPAREQ) { + /* + * Wait for the ulp/CM to call accept/reject + */ + siw_dbg_cep(cep, + "mpa req recvd, wait for ULP\n"); + } else if (cep->state == SIW_EPSTATE_AWAIT_MPAREQ) { + /* + * Socket close before MPA request received. + */ + if (cep->listen_cep) { + siw_dbg_cep(cep, + "no mpareq: drop listener\n"); + siw_cep_put(cep->listen_cep); + cep->listen_cep = NULL; + } + } + } + release_cep = 1; + break; + + case SIW_CM_WORK_MPATIMEOUT: + cep->mpa_timer = NULL; + + if (cep->state == SIW_EPSTATE_AWAIT_MPAREP) { + /* + * MPA request timed out: + * Hide any partially received private data and signal + * timeout + */ + cep->mpa.hdr.params.pd_len = 0; + + if (cep->cm_id) + siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY, + -ETIMEDOUT); + release_cep = 1; + + } else if (cep->state == SIW_EPSTATE_AWAIT_MPAREQ) { + /* + * No MPA request received after peer TCP stream setup. + */ + if (cep->listen_cep) { + siw_cep_put(cep->listen_cep); + cep->listen_cep = NULL; + } + release_cep = 1; + } + break; + + default: + WARN(1, "Undefined CM work type: %d\n", work->type); + } + if (release_cep) { + siw_dbg_cep(cep, + "release: timer=%s, QP[%u]\n", + cep->mpa_timer ? "y" : "n", + cep->qp ? qp_id(cep->qp) : UINT_MAX); + + siw_cancel_mpatimer(cep); + + cep->state = SIW_EPSTATE_CLOSED; + + if (cep->qp) { + struct siw_qp *qp = cep->qp; + /* + * Serialize a potential race with application + * closing the QP and calling siw_qp_cm_drop() + */ + siw_qp_get(qp); + siw_cep_set_free(cep); + + siw_qp_llp_close(qp); + siw_qp_put(qp); + + siw_cep_set_inuse(cep); + cep->qp = NULL; + siw_qp_put(qp); + } + if (cep->sock) { + siw_socket_disassoc(cep->sock); + sock_release(cep->sock); + cep->sock = NULL; + } + if (cep->cm_id) { + cep->cm_id->rem_ref(cep->cm_id); + cep->cm_id = NULL; + siw_cep_put(cep); + } + } + siw_cep_set_free(cep); + siw_put_work(work); + siw_cep_put(cep); +} + +static struct workqueue_struct *siw_cm_wq; + +int siw_cm_queue_work(struct siw_cep *cep, enum siw_work_type type) +{ + struct siw_cm_work *work = siw_get_work(cep); + unsigned long delay = 0; + + if (!work) { + siw_dbg_cep(cep, "failed with no work available\n"); + return -ENOMEM; + } + work->type = type; + work->cep = cep; + + siw_cep_get(cep); + + INIT_DELAYED_WORK(&work->work, siw_cm_work_handler); + + if (type == SIW_CM_WORK_MPATIMEOUT) { + cep->mpa_timer = work; + + if (cep->state == SIW_EPSTATE_AWAIT_MPAREP) + delay = MPAREQ_TIMEOUT; + else + delay = MPAREP_TIMEOUT; + } + siw_dbg_cep(cep, "[QP %u]: work type: %d, timeout %lu\n", + cep->qp ? qp_id(cep->qp) : -1, type, delay); + + queue_delayed_work(siw_cm_wq, &work->work, delay); + + return 0; +} + +static void siw_cm_llp_data_ready(struct sock *sk) +{ + struct siw_cep *cep; + + read_lock(&sk->sk_callback_lock); + + cep = sk_to_cep(sk); + if (!cep) + goto out; + + siw_dbg_cep(cep, "cep state: %d, socket state %d\n", + cep->state, sk->sk_state); + + if (sk->sk_state != TCP_ESTABLISHED) + goto out; + + switch (cep->state) { + case SIW_EPSTATE_RDMA_MODE: + case SIW_EPSTATE_LISTENING: + break; + + case SIW_EPSTATE_AWAIT_MPAREQ: + case SIW_EPSTATE_AWAIT_MPAREP: + siw_cm_queue_work(cep, SIW_CM_WORK_READ_MPAHDR); + break; + + default: + siw_dbg_cep(cep, "unexpected data, state %d\n", cep->state); + break; + } +out: + read_unlock(&sk->sk_callback_lock); +} + +static void siw_cm_llp_write_space(struct sock *sk) +{ + struct siw_cep *cep = sk_to_cep(sk); + + if (cep) + siw_dbg_cep(cep, "state: %d\n", cep->state); +} + +static void siw_cm_llp_error_report(struct sock *sk) +{ + struct siw_cep *cep = sk_to_cep(sk); + + if (cep) { + siw_dbg_cep(cep, "error %d, socket state: %d, cep state: %d\n", + sk->sk_err, sk->sk_state, cep->state); + cep->sk_error_report(sk); + } +} + +static void siw_cm_llp_state_change(struct sock *sk) +{ + struct siw_cep *cep; + void (*orig_state_change)(struct sock *s); + + read_lock(&sk->sk_callback_lock); + + cep = sk_to_cep(sk); + if (!cep) { + /* endpoint already disassociated */ + read_unlock(&sk->sk_callback_lock); + return; + } + orig_state_change = cep->sk_state_change; + + siw_dbg_cep(cep, "state: %d\n", cep->state); + + switch (sk->sk_state) { + case TCP_ESTABLISHED: + /* + * handle accepting socket as special case where only + * new connection is possible + */ + siw_cm_queue_work(cep, SIW_CM_WORK_ACCEPT); + break; + + case TCP_CLOSE: + case TCP_CLOSE_WAIT: + if (cep->qp) + cep->qp->tx_ctx.tx_suspend = 1; + siw_cm_queue_work(cep, SIW_CM_WORK_PEER_CLOSE); + break; + + default: + siw_dbg_cep(cep, "unexpected socket state %d\n", sk->sk_state); + } + read_unlock(&sk->sk_callback_lock); + orig_state_change(sk); +} + +static int kernel_bindconnect(struct socket *s, struct sockaddr *laddr, + struct sockaddr *raddr) +{ + int rv, flags = 0; + size_t size = laddr->sa_family == AF_INET ? + sizeof(struct sockaddr_in) : sizeof(struct sockaddr_in6); + + /* + * Make address available again asap. + */ + sock_set_reuseaddr(s->sk); + + rv = s->ops->bind(s, laddr, size); + if (rv < 0) + return rv; + + rv = s->ops->connect(s, raddr, size, flags); + + return rv < 0 ? rv : 0; +} + +int siw_connect(struct iw_cm_id *id, struct iw_cm_conn_param *params) +{ + struct siw_device *sdev = to_siw_dev(id->device); + struct siw_qp *qp; + struct siw_cep *cep = NULL; + struct socket *s = NULL; + struct sockaddr *laddr = (struct sockaddr *)&id->local_addr, + *raddr = (struct sockaddr *)&id->remote_addr; + bool p2p_mode = peer_to_peer, v4 = true; + u16 pd_len = params->private_data_len; + int version = mpa_version, rv; + + if (pd_len > MPA_MAX_PRIVDATA) + return -EINVAL; + + if (params->ird > sdev->attrs.max_ird || + params->ord > sdev->attrs.max_ord) + return -ENOMEM; + + if (laddr->sa_family == AF_INET6) + v4 = false; + else if (laddr->sa_family != AF_INET) + return -EAFNOSUPPORT; + + /* + * Respect any iwarp port mapping: Use mapped remote address + * if valid. Local address must not be mapped, since siw + * uses kernel TCP stack. + */ + if ((v4 && to_sockaddr_in(id->remote_addr).sin_port != 0) || + to_sockaddr_in6(id->remote_addr).sin6_port != 0) + raddr = (struct sockaddr *)&id->m_remote_addr; + + qp = siw_qp_id2obj(sdev, params->qpn); + if (!qp) { + WARN(1, "[QP %u] does not exist\n", params->qpn); + rv = -EINVAL; + goto error; + } + siw_dbg_qp(qp, "pd_len %d, laddr %pISp, raddr %pISp\n", pd_len, laddr, + raddr); + + rv = sock_create(v4 ? AF_INET : AF_INET6, SOCK_STREAM, IPPROTO_TCP, &s); + if (rv < 0) + goto error; + + /* + * NOTE: For simplification, connect() is called in blocking + * mode. Might be reconsidered for async connection setup at + * TCP level. + */ + rv = kernel_bindconnect(s, laddr, raddr); + if (rv != 0) { + siw_dbg_qp(qp, "kernel_bindconnect: error %d\n", rv); + goto error; + } + if (siw_tcp_nagle == false) + tcp_sock_set_nodelay(s->sk); + cep = siw_cep_alloc(sdev); + if (!cep) { + rv = -ENOMEM; + goto error; + } + siw_cep_set_inuse(cep); + + /* Associate QP with CEP */ + siw_cep_get(cep); + qp->cep = cep; + + /* siw_qp_get(qp) already done by QP lookup */ + cep->qp = qp; + + id->add_ref(id); + cep->cm_id = id; + + /* + * 4: Allocate a sufficient number of work elements + * to allow concurrent handling of local + peer close + * events, MPA header processing + MPA timeout. + */ + rv = siw_cm_alloc_work(cep, 4); + if (rv != 0) { + rv = -ENOMEM; + goto error; + } + cep->ird = params->ird; + cep->ord = params->ord; + + if (p2p_mode && cep->ord == 0) + cep->ord = 1; + + cep->state = SIW_EPSTATE_CONNECTING; + + /* + * Associate CEP with socket + */ + siw_cep_socket_assoc(cep, s); + + cep->state = SIW_EPSTATE_AWAIT_MPAREP; + + /* + * Set MPA Request bits: CRC if required, no MPA Markers, + * MPA Rev. according to module parameter 'mpa_version', Key 'Request'. + */ + cep->mpa.hdr.params.bits = 0; + if (version > MPA_REVISION_2) { + pr_warn("Setting MPA version to %u\n", MPA_REVISION_2); + version = MPA_REVISION_2; + /* Adjust also module parameter */ + mpa_version = MPA_REVISION_2; + } + __mpa_rr_set_revision(&cep->mpa.hdr.params.bits, version); + + if (try_gso) + cep->mpa.hdr.params.bits |= MPA_RR_FLAG_GSO_EXP; + + if (mpa_crc_required) + cep->mpa.hdr.params.bits |= MPA_RR_FLAG_CRC; + + /* + * If MPA version == 2: + * o Include ORD and IRD. + * o Indicate peer-to-peer mode, if required by module + * parameter 'peer_to_peer'. + */ + if (version == MPA_REVISION_2) { + cep->enhanced_rdma_conn_est = true; + cep->mpa.hdr.params.bits |= MPA_RR_FLAG_ENHANCED; + + cep->mpa.v2_ctrl.ird = htons(cep->ird); + cep->mpa.v2_ctrl.ord = htons(cep->ord); + + if (p2p_mode) { + cep->mpa.v2_ctrl.ird |= MPA_V2_PEER_TO_PEER; + cep->mpa.v2_ctrl.ord |= rtr_type; + } + /* Remember own P2P mode requested */ + cep->mpa.v2_ctrl_req.ird = cep->mpa.v2_ctrl.ird; + cep->mpa.v2_ctrl_req.ord = cep->mpa.v2_ctrl.ord; + } + memcpy(cep->mpa.hdr.key, MPA_KEY_REQ, 16); + + rv = siw_send_mpareqrep(cep, params->private_data, pd_len); + /* + * Reset private data. + */ + cep->mpa.hdr.params.pd_len = 0; + + if (rv >= 0) { + rv = siw_cm_queue_work(cep, SIW_CM_WORK_MPATIMEOUT); + if (!rv) { + siw_dbg_cep(cep, "[QP %u]: exit\n", qp_id(qp)); + siw_cep_set_free(cep); + return 0; + } + } +error: + siw_dbg(id->device, "failed: %d\n", rv); + + if (cep) { + siw_socket_disassoc(s); + sock_release(s); + cep->sock = NULL; + + cep->qp = NULL; + + cep->cm_id = NULL; + id->rem_ref(id); + + qp->cep = NULL; + siw_cep_put(cep); + + cep->state = SIW_EPSTATE_CLOSED; + + siw_cep_set_free(cep); + + siw_cep_put(cep); + + } else if (s) { + sock_release(s); + } + if (qp) + siw_qp_put(qp); + + return rv; +} + +/* + * siw_accept - Let SoftiWARP accept an RDMA connection request + * + * @id: New connection management id to be used for accepted + * connection request + * @params: Connection parameters provided by ULP for accepting connection + * + * Transition QP to RTS state, associate new CM id @id with accepted CEP + * and get prepared for TCP input by installing socket callbacks. + * Then send MPA Reply and generate the "connection established" event. + * Socket callbacks must be installed before sending MPA Reply, because + * the latter may cause a first RDMA message to arrive from the RDMA Initiator + * side very quickly, at which time the socket callbacks must be ready. + */ +int siw_accept(struct iw_cm_id *id, struct iw_cm_conn_param *params) +{ + struct siw_device *sdev = to_siw_dev(id->device); + struct siw_cep *cep = (struct siw_cep *)id->provider_data; + struct siw_qp *qp; + struct siw_qp_attrs qp_attrs; + int rv, max_priv_data = MPA_MAX_PRIVDATA; + bool wait_for_peer_rts = false; + + siw_cep_set_inuse(cep); + siw_cep_put(cep); + + /* Free lingering inbound private data */ + if (cep->mpa.hdr.params.pd_len) { + cep->mpa.hdr.params.pd_len = 0; + kfree(cep->mpa.pdata); + cep->mpa.pdata = NULL; + } + siw_cancel_mpatimer(cep); + + if (cep->state != SIW_EPSTATE_RECVD_MPAREQ) { + siw_dbg_cep(cep, "out of state\n"); + + siw_cep_set_free(cep); + siw_cep_put(cep); + + return -ECONNRESET; + } + qp = siw_qp_id2obj(sdev, params->qpn); + if (!qp) { + WARN(1, "[QP %d] does not exist\n", params->qpn); + siw_cep_set_free(cep); + siw_cep_put(cep); + + return -EINVAL; + } + down_write(&qp->state_lock); + if (qp->attrs.state > SIW_QP_STATE_RTR) { + rv = -EINVAL; + up_write(&qp->state_lock); + goto error; + } + siw_dbg_cep(cep, "[QP %d]\n", params->qpn); + + if (try_gso && cep->mpa.hdr.params.bits & MPA_RR_FLAG_GSO_EXP) { + siw_dbg_cep(cep, "peer allows GSO on TX\n"); + qp->tx_ctx.gso_seg_limit = 0; + } + if (params->ord > sdev->attrs.max_ord || + params->ird > sdev->attrs.max_ird) { + siw_dbg_cep( + cep, + "[QP %u]: ord %d (max %d), ird %d (max %d)\n", + qp_id(qp), params->ord, sdev->attrs.max_ord, + params->ird, sdev->attrs.max_ird); + rv = -EINVAL; + up_write(&qp->state_lock); + goto error; + } + if (cep->enhanced_rdma_conn_est) + max_priv_data -= sizeof(struct mpa_v2_data); + + if (params->private_data_len > max_priv_data) { + siw_dbg_cep( + cep, + "[QP %u]: private data length: %d (max %d)\n", + qp_id(qp), params->private_data_len, max_priv_data); + rv = -EINVAL; + up_write(&qp->state_lock); + goto error; + } + if (cep->enhanced_rdma_conn_est) { + if (params->ord > cep->ord) { + if (relaxed_ird_negotiation) { + params->ord = cep->ord; + } else { + cep->ird = params->ird; + cep->ord = params->ord; + rv = -EINVAL; + up_write(&qp->state_lock); + goto error; + } + } + if (params->ird < cep->ird) { + if (relaxed_ird_negotiation && + cep->ird <= sdev->attrs.max_ird) + params->ird = cep->ird; + else { + rv = -ENOMEM; + up_write(&qp->state_lock); + goto error; + } + } + if (cep->mpa.v2_ctrl.ord & + (MPA_V2_RDMA_WRITE_RTR | MPA_V2_RDMA_READ_RTR)) + wait_for_peer_rts = true; + /* + * Signal back negotiated IRD and ORD values + */ + cep->mpa.v2_ctrl.ord = + htons(params->ord & MPA_IRD_ORD_MASK) | + (cep->mpa.v2_ctrl.ord & ~MPA_V2_MASK_IRD_ORD); + cep->mpa.v2_ctrl.ird = + htons(params->ird & MPA_IRD_ORD_MASK) | + (cep->mpa.v2_ctrl.ird & ~MPA_V2_MASK_IRD_ORD); + } + cep->ird = params->ird; + cep->ord = params->ord; + + cep->cm_id = id; + id->add_ref(id); + + memset(&qp_attrs, 0, sizeof(qp_attrs)); + qp_attrs.orq_size = cep->ord; + qp_attrs.irq_size = cep->ird; + qp_attrs.sk = cep->sock; + if (cep->mpa.hdr.params.bits & MPA_RR_FLAG_CRC) + qp_attrs.flags = SIW_MPA_CRC; + qp_attrs.state = SIW_QP_STATE_RTS; + + siw_dbg_cep(cep, "[QP%u]: moving to rts\n", qp_id(qp)); + + /* Associate QP with CEP */ + siw_cep_get(cep); + qp->cep = cep; + + /* siw_qp_get(qp) already done by QP lookup */ + cep->qp = qp; + + cep->state = SIW_EPSTATE_RDMA_MODE; + + /* Move socket RX/TX under QP control */ + rv = siw_qp_modify(qp, &qp_attrs, + SIW_QP_ATTR_STATE | SIW_QP_ATTR_LLP_HANDLE | + SIW_QP_ATTR_ORD | SIW_QP_ATTR_IRD | + SIW_QP_ATTR_MPA); + up_write(&qp->state_lock); + + if (rv) + goto error; + + siw_dbg_cep(cep, "[QP %u]: send mpa reply, %d byte pdata\n", + qp_id(qp), params->private_data_len); + + rv = siw_send_mpareqrep(cep, params->private_data, + params->private_data_len); + if (rv != 0) + goto error; + + if (wait_for_peer_rts) { + siw_sk_assign_rtr_upcalls(cep); + } else { + siw_qp_socket_assoc(cep, qp); + rv = siw_cm_upcall(cep, IW_CM_EVENT_ESTABLISHED, 0); + if (rv) + goto error; + } + siw_cep_set_free(cep); + + return 0; +error: + siw_socket_disassoc(cep->sock); + sock_release(cep->sock); + cep->sock = NULL; + + cep->state = SIW_EPSTATE_CLOSED; + + if (cep->cm_id) { + cep->cm_id->rem_ref(id); + cep->cm_id = NULL; + } + if (qp->cep) { + siw_cep_put(cep); + qp->cep = NULL; + } + cep->qp = NULL; + siw_qp_put(qp); + + siw_cep_set_free(cep); + siw_cep_put(cep); + + return rv; +} + +/* + * siw_reject() + * + * Local connection reject case. Send private data back to peer, + * close connection and dereference connection id. + */ +int siw_reject(struct iw_cm_id *id, const void *pdata, u8 pd_len) +{ + struct siw_cep *cep = (struct siw_cep *)id->provider_data; + + siw_cep_set_inuse(cep); + siw_cep_put(cep); + + siw_cancel_mpatimer(cep); + + if (cep->state != SIW_EPSTATE_RECVD_MPAREQ) { + siw_dbg_cep(cep, "out of state\n"); + + siw_cep_set_free(cep); + siw_cep_put(cep); /* put last reference */ + + return -ECONNRESET; + } + siw_dbg_cep(cep, "cep->state %d, pd_len %d\n", cep->state, + pd_len); + + if (__mpa_rr_revision(cep->mpa.hdr.params.bits) >= MPA_REVISION_1) { + cep->mpa.hdr.params.bits |= MPA_RR_FLAG_REJECT; /* reject */ + siw_send_mpareqrep(cep, pdata, pd_len); + } + siw_socket_disassoc(cep->sock); + sock_release(cep->sock); + cep->sock = NULL; + + cep->state = SIW_EPSTATE_CLOSED; + + siw_cep_set_free(cep); + siw_cep_put(cep); + + return 0; +} + +/* + * siw_create_listen - Create resources for a listener's IWCM ID @id + * + * Starts listen on the socket address id->local_addr. + * + */ +int siw_create_listen(struct iw_cm_id *id, int backlog) +{ + struct socket *s; + struct siw_cep *cep = NULL; + struct siw_device *sdev = to_siw_dev(id->device); + int addr_family = id->local_addr.ss_family; + int rv = 0; + + if (addr_family != AF_INET && addr_family != AF_INET6) + return -EAFNOSUPPORT; + + rv = sock_create(addr_family, SOCK_STREAM, IPPROTO_TCP, &s); + if (rv < 0) + return rv; + + /* + * Allow binding local port when still in TIME_WAIT from last close. + */ + sock_set_reuseaddr(s->sk); + + if (addr_family == AF_INET) { + struct sockaddr_in *laddr = &to_sockaddr_in(id->local_addr); + + /* For wildcard addr, limit binding to current device only */ + if (ipv4_is_zeronet(laddr->sin_addr.s_addr)) + s->sk->sk_bound_dev_if = sdev->netdev->ifindex; + + rv = s->ops->bind(s, (struct sockaddr *)laddr, + sizeof(struct sockaddr_in)); + } else { + struct sockaddr_in6 *laddr = &to_sockaddr_in6(id->local_addr); + + /* For wildcard addr, limit binding to current device only */ + if (ipv6_addr_any(&laddr->sin6_addr)) + s->sk->sk_bound_dev_if = sdev->netdev->ifindex; + + rv = s->ops->bind(s, (struct sockaddr *)laddr, + sizeof(struct sockaddr_in6)); + } + if (rv) { + siw_dbg(id->device, "socket bind error: %d\n", rv); + goto error; + } + cep = siw_cep_alloc(sdev); + if (!cep) { + rv = -ENOMEM; + goto error; + } + siw_cep_socket_assoc(cep, s); + + rv = siw_cm_alloc_work(cep, backlog); + if (rv) { + siw_dbg(id->device, + "alloc_work error %d, backlog %d\n", + rv, backlog); + goto error; + } + rv = s->ops->listen(s, backlog); + if (rv) { + siw_dbg(id->device, "listen error %d\n", rv); + goto error; + } + cep->cm_id = id; + id->add_ref(id); + + /* + * In case of a wildcard rdma_listen on a multi-homed device, + * a listener's IWCM id is associated with more than one listening CEP. + * + * We currently use id->provider_data in three different ways: + * + * o For a listener's IWCM id, id->provider_data points to + * the list_head of the list of listening CEPs. + * Uses: siw_create_listen(), siw_destroy_listen() + * + * o For each accepted passive-side IWCM id, id->provider_data + * points to the CEP itself. This is a consequence of + * - siw_cm_upcall() setting event.provider_data = cep and + * - the IWCM's cm_conn_req_handler() setting provider_data of the + * new passive-side IWCM id equal to event.provider_data + * Uses: siw_accept(), siw_reject() + * + * o For an active-side IWCM id, id->provider_data is not used at all. + * + */ + if (!id->provider_data) { + id->provider_data = + kmalloc(sizeof(struct list_head), GFP_KERNEL); + if (!id->provider_data) { + rv = -ENOMEM; + goto error; + } + INIT_LIST_HEAD((struct list_head *)id->provider_data); + } + list_add_tail(&cep->listenq, (struct list_head *)id->provider_data); + cep->state = SIW_EPSTATE_LISTENING; + + siw_dbg(id->device, "Listen at laddr %pISp\n", &id->local_addr); + + return 0; + +error: + siw_dbg(id->device, "failed: %d\n", rv); + + if (cep) { + siw_cep_set_inuse(cep); + + if (cep->cm_id) { + cep->cm_id->rem_ref(cep->cm_id); + cep->cm_id = NULL; + } + cep->sock = NULL; + siw_socket_disassoc(s); + cep->state = SIW_EPSTATE_CLOSED; + + siw_cep_set_free(cep); + siw_cep_put(cep); + } + sock_release(s); + + return rv; +} + +static void siw_drop_listeners(struct iw_cm_id *id) +{ + struct list_head *p, *tmp; + + /* + * In case of a wildcard rdma_listen on a multi-homed device, + * a listener's IWCM id is associated with more than one listening CEP. + */ + list_for_each_safe(p, tmp, (struct list_head *)id->provider_data) { + struct siw_cep *cep = list_entry(p, struct siw_cep, listenq); + + list_del(p); + + siw_dbg_cep(cep, "drop cep, state %d\n", cep->state); + + siw_cep_set_inuse(cep); + + if (cep->cm_id) { + cep->cm_id->rem_ref(cep->cm_id); + cep->cm_id = NULL; + } + if (cep->sock) { + siw_socket_disassoc(cep->sock); + sock_release(cep->sock); + cep->sock = NULL; + } + cep->state = SIW_EPSTATE_CLOSED; + siw_cep_set_free(cep); + siw_cep_put(cep); + } +} + +int siw_destroy_listen(struct iw_cm_id *id) +{ + if (!id->provider_data) { + siw_dbg(id->device, "no cep(s)\n"); + return 0; + } + siw_drop_listeners(id); + kfree(id->provider_data); + id->provider_data = NULL; + + return 0; +} + +int siw_cm_init(void) +{ + /* + * create_single_workqueue for strict ordering + */ + siw_cm_wq = create_singlethread_workqueue("siw_cm_wq"); + if (!siw_cm_wq) + return -ENOMEM; + + return 0; +} + +void siw_cm_exit(void) +{ + if (siw_cm_wq) { + flush_workqueue(siw_cm_wq); + destroy_workqueue(siw_cm_wq); + } +} |