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Message-Id: <1286261660-5157-1-git-send-email-bmt@zurich.ibm.com>
Date: Tue, 5 Oct 2010 08:54:20 +0200
From: Bernard Metzler <bmt@...ich.ibm.com>
To: netdev@...r.kernel.org
Cc: linux-rdma@...r.kernel.org, Bernard Metzler <bmt@...ich.ibm.com>
Subject: [PATCH] SIW: Connection management
---
drivers/infiniband/hw/siw/siw_cm.c | 1939 ++++++++++++++++++++++++++++++++++++
drivers/infiniband/hw/siw/siw_cm.h | 155 +++
2 files changed, 2094 insertions(+), 0 deletions(-)
create mode 100644 drivers/infiniband/hw/siw/siw_cm.c
create mode 100644 drivers/infiniband/hw/siw/siw_cm.h
diff --git a/drivers/infiniband/hw/siw/siw_cm.c b/drivers/infiniband/hw/siw/siw_cm.c
new file mode 100644
index 0000000..628b3b1
--- /dev/null
+++ b/drivers/infiniband/hw/siw/siw_cm.c
@@ -0,0 +1,1939 @@
+/*
+ * Software iWARP device driver for Linux
+ *
+ * Authors: Bernard Metzler <bmt@...ich.ibm.com>
+ * Fredy Neeser <nfd@...ich.ibm.com>
+ *
+ * Copyright (c) 2008-2010, IBM Corporation
+ *
+ * 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
+ * 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.
+ *
+ * - Neither the name of IBM nor the names of its contributors may be
+ * used to endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * 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/module.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/net.h>
+#include <linux/inetdevice.h>
+#include <linux/workqueue.h>
+#include <net/sock.h>
+#include <linux/tcp.h>
+
+
+#include <rdma/iw_cm.h>
+#include <rdma/ib_verbs.h>
+#include <rdma/ib_smi.h>
+#include <rdma/ib_user_verbs.h>
+
+#include "siw.h"
+#include "siw_cm.h"
+#include "siw_obj.h"
+
+static int mpa_crc_enabled;
+module_param(mpa_crc_enabled, int, 0644);
+MODULE_PARM_DESC(mpa_crc_enabled, "MPA CRC enabled");
+
+static int mpa_revision = 1;
+
+
+/*
+ * siw_sock_nodelay() - Disable Nagle algorithm
+ *
+ * See also fs/ocfs2/cluster/tcp.c, o2net_set_nodelay()
+ */
+static int siw_sock_nodelay(struct socket *sock)
+{
+ int ret, val = 1;
+ mm_segment_t oldfs;
+ oldfs = get_fs();
+ set_fs(KERNEL_DS);
+
+ /*
+ * Don't use sock_setsockopt() for SOL_TCP. It doesn't check its level
+ * argument and assumes SOL_SOCKET so, say, your TCP_NODELAY will
+ * silently turn into SO_DEBUG.
+ */
+ ret = sock->ops->setsockopt(sock, SOL_TCP, TCP_NODELAY,
+ (char __user *)&val, sizeof(val));
+ set_fs(oldfs);
+ return ret;
+}
+
+static void siw_cm_llp_state_change(struct sock *);
+static void siw_cm_llp_data_ready(struct sock *, int);
+static void siw_cm_llp_write_space(struct sock *);
+static void siw_cm_llp_error_report(struct sock *);
+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);
+ BUG_ON(!cep);
+
+ 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;
+ sk->sk_no_check = 0;
+}
+
+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);
+ }
+ write_unlock_bh(&sk->sk_callback_lock);
+ }
+}
+
+
+static inline int kernel_peername(struct socket *s, struct sockaddr_in *addr)
+{
+ int unused;
+ return s->ops->getname(s, (struct sockaddr *)addr, &unused, 1);
+}
+
+static inline int kernel_localname(struct socket *s, struct sockaddr_in *addr)
+{
+ int unused;
+ return s->ops->getname(s, (struct sockaddr *)addr, &unused, 0);
+}
+
+static void siw_cep_socket_assoc(struct siw_cep *cep, struct socket *s)
+{
+ cep->llp.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(void)
+{
+ struct siw_cep *cep = kzalloc(sizeof *cep, GFP_KERNEL);
+ if (cep) {
+ INIT_LIST_HEAD(&cep->list);
+ INIT_LIST_HEAD(&cep->work_freelist);
+
+ cep->mpa.hdr.params.c = mpa_crc_enabled ? 1 : 0;
+ cep->mpa.hdr.params.m = 0;
+ cep->mpa.hdr.params.rev = mpa_revision ? 1 : 0;
+ kref_init(&cep->ref);
+ cep->state = SIW_EPSTATE_IDLE;
+ init_waitqueue_head(&cep->waitq);
+ spin_lock_init(&cep->lock);
+ dprint(DBG_OBJ|DBG_CM, "(CEP 0x%p): New Object\n", cep);
+ }
+ 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_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_dealloc(struct kref *ref)
+{
+ struct siw_cep *cep = container_of(ref, struct siw_cep, ref);
+
+ dprint(DBG_OBJ|DBG_CM, "(CEP 0x%p): Free Object\n", cep);
+
+ if (cep->listen_cep)
+ siw_cep_put(cep->listen_cep);
+
+ /* kfree(NULL) is save */
+ 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);
+
+ 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;
+
+ BUG_ON(!list_empty(&cep->work_freelist));
+
+ while (num--) {
+ work = kmalloc(sizeof *work, GFP_KERNEL);
+ if (!work) {
+ if (!(list_empty(&cep->work_freelist)))
+ siw_cm_free_work(cep);
+ dprint(DBG_ON, " Failed\n");
+ return -ENOMEM;
+ }
+ work->cep = cep;
+ INIT_LIST_HEAD(&work->list);
+ list_add(&work->list, &cep->work_freelist);
+ }
+ return 0;
+}
+
+static void siw_cm_release(struct siw_cep *cep)
+{
+ if (cep->llp.sock) {
+ siw_socket_disassoc(cep->llp.sock);
+ sock_release(cep->llp.sock);
+ cep->llp.sock = NULL;
+ }
+ if (cep->qp) {
+ struct siw_qp *qp = cep->qp;
+ cep->qp = NULL;
+ siw_qp_put(qp);
+ }
+ if (cep->cm_id) {
+ cep->cm_id->rem_ref(cep->cm_id);
+ cep->cm_id = NULL;
+ siw_cep_put(cep);
+ }
+ cep->state = SIW_EPSTATE_CLOSED;
+}
+
+/*
+ * Test and set CEP into CLOSE pending. After calling
+ * this function, the CEP conn_close flag is set. Returns:
+ *
+ * 1, if CEP is currently in use,
+ * 0, if CEP is not in use and not already in CLOSE,
+ * -1, if CEP is not in use and already in CLOSE.
+ */
+int siw_cep_in_close(struct siw_cep *cep)
+{
+ int rv;
+
+ spin_lock_bh(&cep->lock);
+
+ dprint(DBG_CM, " (CEP 0x%p): close %d, use %d\n",
+ cep, cep->conn_close, cep->in_use);
+
+ rv = cep->in_use ? 1 : (cep->conn_close ? -1 : 0);
+ cep->conn_close = 1; /* may be redundant */
+
+ spin_unlock_bh(&cep->lock);
+
+ return rv;
+}
+
+/*
+ * 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) and if IWCM should get
+ * informed of LLP state change.
+ */
+void siw_qp_cm_drop(struct siw_qp *qp, int schedule)
+{
+ struct siw_cep *cep = qp->cep;
+
+ qp->rx_ctx.rx_suspend = 1;
+ qp->tx_ctx.tx_suspend = 1;
+
+ if (cep && !siw_cep_in_close(cep)) {
+ if (schedule) {
+ siw_cm_queue_work(cep, SIW_CM_WORK_CLOSE_LLP);
+ return;
+ }
+ /*
+ * Immediately close socket
+ */
+ dprint(DBG_CM, "(): immediate close, cep->state=%d\n",
+ cep->state);
+
+ if (cep->cm_id) {
+ switch (cep->state) {
+
+ case SIW_EPSTATE_AWAIT_MPAREP:
+ siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY,
+ IW_CM_EVENT_STATUS_EINVAL);
+ break;
+
+ case SIW_EPSTATE_RDMA_MODE:
+ siw_cm_upcall(cep, IW_CM_EVENT_CLOSE,
+ IW_CM_EVENT_STATUS_OK);
+
+ 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->llp.sock) {
+ siw_socket_disassoc(cep->llp.sock);
+ sock_release(cep->llp.sock);
+ cep->llp.sock = NULL;
+ }
+ cep->qp = NULL;
+ siw_qp_put(qp);
+ }
+}
+
+
+/*
+ * Set CEP in_use flag. Returns:
+ *
+ * 1, if CEP was not in use and not scheduled for closing,
+ * 0, if CEP was not in use but scheduled for closing,
+ * -1, if CEP is currently in use.
+ */
+static int siw_cep_set_inuse(struct siw_cep *cep)
+{
+ int rv;
+
+ spin_lock_bh(&cep->lock);
+
+ dprint(DBG_CM, " (CEP 0x%p): close %d, use %d\n",
+ cep, cep->conn_close, cep->in_use);
+
+ rv = cep->in_use ? -1 : (cep->conn_close ? 0 : 1);
+ cep->in_use = 1; /* may be redundant */
+
+ spin_unlock_bh(&cep->lock);
+
+ return rv;
+}
+
+/*
+ * Clear CEP in_use flag. Returns:
+ *
+ * 1, if CEP is not scheduled for closing,
+ * 0, else.
+ */
+static int siw_cep_set_free(struct siw_cep *cep)
+{
+ int rv;
+
+ spin_lock_bh(&cep->lock);
+
+ dprint(DBG_CM, " (CEP 0x%p): close %d, use %d\n",
+ cep, cep->conn_close, cep->in_use);
+
+ cep->in_use = 0;
+ rv = cep->conn_close ? 0 : 1;
+
+ spin_unlock_bh(&cep->lock);
+
+ wake_up(&cep->waitq);
+
+ return rv;
+}
+
+
+void siw_cep_put(struct siw_cep *cep)
+{
+ dprint(DBG_OBJ|DBG_CM, "(CEP 0x%p): New refcount: %d\n",
+ cep, atomic_read(&cep->ref.refcount) - 1);
+
+ if (!kref_put(&cep->ref, __siw_cep_dealloc))
+ wake_up(&cep->waitq);
+}
+
+void siw_cep_get(struct siw_cep *cep)
+{
+ kref_get(&cep->ref);
+ dprint(DBG_OBJ|DBG_CM, "(CEP 0x%p): New refcount: %d\n",
+ cep, atomic_read(&cep->ref.refcount));
+}
+
+
+
+static inline int ksock_recv(struct socket *sock, char *buf, size_t size,
+ int flags)
+{
+ struct kvec iov = {buf, size};
+ struct msghdr msg = {.msg_name = NULL, .msg_flags = flags};
+
+ return kernel_recvmsg(sock, &msg, &iov, 1, size, flags);
+}
+
+/*
+ * Receive MPA Request/Reply heder.
+ *
+ * Returns 0 if complete MPA Request/Reply haeder 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->llp.sock;
+ 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;
+
+ hdr->params.pd_len = ntohs(hdr->params.pd_len);
+
+ if (hdr->params.pd_len > MPA_MAX_PRIVDATA)
+ return -EPROTO;
+ }
+
+ /*
+ * At least the MPA Request/Reply header (frame not including
+ * private data) has been received.
+ * Receive (or continue receiving) any private data.
+ */
+ to_rcv = hdr->params.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) {
+ dprint(DBG_CM, " peer EOF\n");
+ return -EPIPE;
+ }
+ if (rcvd < 0) {
+ dprint(DBG_CM, " ERROR: %d: \n", rcvd);
+ return rcvd;
+ }
+ dprint(DBG_CM, " 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 iff hdr->params.pd_len != 0.
+ * Ownership of this buffer will be transferred to the IWCM
+ * when calling siw_cm_upcall().
+ */
+ if (!cep->mpa.pdata &&
+ !(cep->mpa.pdata = kmalloc(hdr->params.pd_len + 4, GFP_KERNEL)))
+ 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) {
+ dprint(DBG_CM, "%d bytes private_data received",
+ hdr->params.pd_len);
+ return 0;
+ }
+ return -EAGAIN;
+}
+
+
+static void siw_proc_mpareq(struct siw_cep *cep)
+{
+ int err = siw_recv_mpa_rr(cep);
+
+ if (err)
+ goto out;
+
+ if (cep->mpa.hdr.params.rev > MPA_REVISION_1) {
+ /* allow for 0 and 1 only */
+ err = -EPROTO;
+ goto out;
+ }
+
+ if (memcmp(cep->mpa.hdr.key, MPA_KEY_REQ, sizeof cep->mpa.hdr.key)) {
+ err = -EPROTO;
+ goto out;
+ }
+ cep->state = SIW_EPSTATE_RECVD_MPAREQ;
+
+ if (cep->listen_cep->state == SIW_EPSTATE_LISTENING) {
+ /*
+ * Since siw_cm_upcall() called with success, iwcm must hold
+ * a reference to the CEP until the IW_CM_EVENT_CONNECT_REQUEST
+ * has been accepted or rejected.
+ * NOTE: If the iwcm never calls back with accept/reject,
+ * (e.g., the user types ^C instead), the CEP can never be
+ * free'd. It results in a memory hole which should be
+ * fixed by calling siw_reject() in case of application
+ * termination..
+ */
+ siw_cep_get(cep);
+
+ err = siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REQUEST,
+ IW_CM_EVENT_STATUS_OK);
+ if (err)
+ siw_cep_put(cep);
+ } else {
+ /*
+ * listener lost: new connection cannot be signalled
+ */
+ dprint(DBG_CM|DBG_ON, "(cep=0x%p): Listener lost:!\n", cep);
+ err = -EINVAL;
+ }
+out:
+ if (err) {
+ dprint(DBG_CM|DBG_ON, "(cep=0x%p): error %d\n", cep, err);
+
+ if (!siw_cep_in_close(cep)) {
+ /*
+ * remove reference from listening cep and clear
+ * information on related listener.
+ */
+ siw_cep_put(cep->listen_cep);
+ cep->listen_cep = NULL;
+
+ siw_socket_disassoc(cep->llp.sock);
+ sock_release(cep->llp.sock);
+ cep->llp.sock = NULL;
+
+ cep->state = SIW_EPSTATE_CLOSED;
+ siw_cep_put(cep);
+ }
+ }
+}
+
+
+static void siw_proc_mpareply(struct siw_cep *cep)
+{
+ struct siw_qp_attrs qp_attrs;
+ struct siw_qp *qp = cep->qp;
+ int rv;
+
+ rv = siw_recv_mpa_rr(cep);
+ if (rv == -EAGAIN)
+ /* incomplete mpa reply */
+ return;
+
+ if (rv)
+ goto error;
+
+ if (cep->mpa.hdr.params.rev > MPA_REVISION_1) {
+ /* allow for 0 and 1 only */
+ rv = -EPROTO;
+ goto error;
+ }
+ if (memcmp(cep->mpa.hdr.key, MPA_KEY_REP, sizeof cep->mpa.hdr.key)) {
+ rv = -EPROTO;
+ goto error;
+ }
+ /*
+ * TODO: 1. handle eventual MPA reject (upcall with ECONNREFUSED)
+ * 2. finish mpa parameter check/negotiation
+ */
+ memset(&qp_attrs, 0, sizeof qp_attrs);
+ qp_attrs.mpa.marker_rcv = 0;
+ qp_attrs.mpa.marker_snd = 0;
+ qp_attrs.mpa.crc = CONFIG_RDMA_SIW_CRC_ENFORCED;
+ qp_attrs.mpa.version = 1;
+ qp_attrs.ird = cep->ird;
+ qp_attrs.ord = cep->ord;
+ qp_attrs.llp_stream_handle = cep->llp.sock;
+ qp_attrs.state = SIW_QP_STATE_RTS;
+
+ /* 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 error;
+ }
+ 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);
+
+ if (!rv) {
+ cep->state = SIW_EPSTATE_RDMA_MODE;
+ siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY,
+ IW_CM_EVENT_STATUS_OK);
+
+ up_write(&qp->state_lock);
+ return;
+ }
+ up_write(&qp->state_lock);
+error:
+ /*
+ * failed socket handover returns responsibility:
+ * inform iwcm and drop connection
+ * TODO: 1. send MPA reject for MPA rev==1
+ * if rv != ECONNREFUSED
+ */
+ siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY, rv);
+
+ if (!siw_cep_in_close(cep)) {
+
+ cep->cm_id->rem_ref(cep->cm_id);
+ cep->cm_id = NULL;
+ siw_cep_put(cep);
+
+ siw_socket_disassoc(cep->llp.sock);
+ sock_release(cep->llp.sock);
+ cep->llp.sock = NULL;
+
+ cep->qp = NULL;
+ siw_qp_put(cep->qp);
+ }
+ cep->state = SIW_EPSTATE_CLOSED;
+}
+
+/*
+ * siw_accept_newconn - accept an incoming pending connection
+ *
+ */
+static void siw_accept_newconn(struct siw_cep *cep)
+{
+ struct socket *s = cep->llp.sock;
+ struct socket *new_s = NULL;
+ struct siw_cep *new_cep = NULL;
+ int rv = 0; /* debug only. should disappear */
+
+ new_cep = siw_cep_alloc();
+ if (!new_cep)
+ goto error;
+
+ 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) {
+ /*
+ * TODO: Already aborted by peer?
+ * Is there anything we should do?
+ */
+ dprint(DBG_CM|DBG_ON, "(cep=0x%p): ERROR: "
+ "kernel_accept(): rv=%d\n", cep, rv);
+ goto error;
+ }
+ new_cep->llp.sock = new_s;
+ siw_cep_get(new_cep);
+ new_s->sk->sk_user_data = new_cep;
+
+ dprint(DBG_CM, "(cep=0x%p, s=0x%p, new_s=0x%p): "
+ "New LLP connection accepted\n", cep, s, new_s);
+
+ rv = siw_sock_nodelay(new_s);
+ if (rv != 0) {
+ dprint(DBG_CM|DBG_ON, "(cep=0x%p): ERROR: "
+ "siw_sock_nodelay(): rv=%d\n", cep, rv);
+ goto error;
+ }
+
+ rv = kernel_peername(new_s, &new_cep->llp.raddr);
+ if (rv != 0) {
+ dprint(DBG_CM|DBG_ON, "(cep=0x%p): ERROR: "
+ "kernel_peername(): rv=%d\n", cep, rv);
+ goto error;
+ }
+ rv = kernel_localname(new_s, &new_cep->llp.laddr);
+ if (rv != 0) {
+ dprint(DBG_CM|DBG_ON, "(cep=0x%p): ERROR: "
+ "kernel_localname(): rv=%d\n", cep, 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);
+
+ new_cep->state = SIW_EPSTATE_AWAIT_MPAREQ;
+
+ if (atomic_read(&new_s->sk->sk_rmem_alloc)) {
+ /*
+ * MPA REQ already queued
+ */
+ dprint(DBG_CM, "(cep=0x%p): Immediate MPA req.\n", cep);
+
+ siw_proc_mpareq(new_cep);
+ }
+ return;
+
+error:
+ if (new_cep)
+ siw_cep_put(new_cep);
+
+ if (new_s) {
+ siw_socket_disassoc(new_s);
+ sock_release(new_s);
+ }
+ dprint(DBG_CM|DBG_ON, "(cep=0x%p): ERROR: rv=%d\n", cep, rv);
+}
+
+/*
+ * Expects params->pd_len in host byte order
+ *
+ * TODO: We might want to combine the arguments params and pdata to a single
+ * pointer to a struct siw_mpa_info as defined in siw_cm.h.
+ * This way, all private data parameters would be in a common struct.
+ */
+static int siw_send_mpareqrep(struct socket *s, struct mpa_rr_params *params,
+ char *key, char *pdata)
+{
+ struct mpa_rr hdr;
+ struct kvec iov[2];
+ struct msghdr msg;
+
+ int rv;
+ unsigned short pd_len = params->pd_len;
+
+ memset(&msg, 0, sizeof(msg));
+ memset(&hdr, 0, sizeof hdr);
+ memcpy(hdr.key, key, 16);
+
+ /*
+ * TODO: By adding a union to struct mpa_rr_params, it should be
+ * possible to replace the next 4 statements by one
+ */
+ hdr.params.r = params->r;
+ hdr.params.c = params->c;
+ hdr.params.m = params->m;
+ hdr.params.rev = params->rev;
+
+ if (pd_len > MPA_MAX_PRIVDATA)
+ return -EINVAL;
+
+ hdr.params.pd_len = htons(pd_len);
+
+ iov[0].iov_base = &hdr;
+ iov[0].iov_len = sizeof hdr;
+
+ if (pd_len) {
+ iov[1].iov_base = pdata;
+ iov[1].iov_len = pd_len;
+
+ rv = kernel_sendmsg(s, &msg, iov, 2, pd_len + sizeof hdr);
+ } else
+ rv = kernel_sendmsg(s, &msg, iov, 1, sizeof hdr);
+
+ return rv < 0 ? rv : 0;
+}
+
+/*
+ * siw_cm_upcall()
+ *
+ * Upcall to IWCM to inform about async connection events
+ */
+int siw_cm_upcall(struct siw_cep *cep, enum iw_cm_event_type reason,
+ enum iw_cm_event_status status)
+{
+ struct iw_cm_event event;
+ struct iw_cm_id *cm_id;
+
+ memset(&event, 0, sizeof event);
+ event.status = status;
+ event.event = reason;
+
+ if (cep->mpa.hdr.params.pd_len != 0) {
+ /*
+ * hand over MPA private data
+ */
+ event.private_data_len = cep->mpa.hdr.params.pd_len;
+ event.private_data = cep->mpa.pdata;
+ cep->mpa.hdr.params.pd_len = 0;
+ }
+ if (reason == IW_CM_EVENT_CONNECT_REQUEST ||
+ reason == IW_CM_EVENT_CONNECT_REPLY) {
+ event.local_addr = cep->llp.laddr;
+ event.remote_addr = cep->llp.raddr;
+ }
+ if (reason == IW_CM_EVENT_CONNECT_REQUEST) {
+ event.provider_data = cep;
+ cm_id = cep->listen_cep->cm_id;
+ } else
+ cm_id = cep->cm_id;
+
+ dprint(DBG_CM, " (QP%d): cep=0x%p, id=0x%p, dev(id)=%s, "
+ "reason=%d, status=%d\n",
+ cep->qp ? QP_ID(cep->qp) : -1, cep, cm_id,
+ cm_id->device->name, reason, status);
+
+ return cm_id->event_handler(cm_id, &event);
+}
+
+static void siw_cm_work_handler(struct work_struct *w)
+{
+ struct siw_cm_work *work;
+ struct siw_cep *cep;
+ int rv;
+
+ work = container_of(w, struct siw_cm_work, work);
+ cep = work->cep;
+
+ dprint(DBG_CM, " (QP%d): WORK type: %d, CEP: 0x%p\n",
+ cep->qp ? QP_ID(cep->qp) : -1, work->type, cep);
+
+ switch (work->type) {
+
+ case SIW_CM_WORK_ACCEPT:
+
+ rv = siw_cep_set_inuse(cep);
+ if (rv > 0) {
+ if (cep->state == SIW_EPSTATE_LISTENING)
+ siw_accept_newconn(cep);
+
+ if (!siw_cep_set_free(cep)) {
+ siw_cm_release(cep);
+ siw_cep_put(cep);
+ }
+ break;
+ }
+ /*
+ * CEP already scheduled for closing
+ */
+ if (!rv) {
+ siw_cm_release(cep);
+ (void) siw_cep_set_free(cep);
+ }
+ break;
+
+ case SIW_CM_WORK_READ_MPAHDR:
+
+ rv = siw_cep_set_inuse(cep);
+ if (rv > 0) {
+ switch (cep->state) {
+
+ case SIW_EPSTATE_AWAIT_MPAREQ:
+
+ siw_proc_mpareq(cep);
+ break;
+
+ case SIW_EPSTATE_AWAIT_MPAREP:
+
+ siw_proc_mpareply(cep);
+ break;
+
+ default:
+ /*
+ * CEP already moved out of MPA handshake.
+ * any connection management already done.
+ * silently ignore the mpa packet.
+ */
+ dprint(DBG_CM, "(): CEP not in MPA "
+ "handshake state: %d\n", cep->state);
+ }
+ if (!siw_cep_set_free(cep))
+ siw_cm_release(cep);
+
+ break;
+ }
+ /*
+ * CEP already scheduled for closing
+ */
+ if (!rv) {
+ siw_cm_release(cep);
+ (void) siw_cep_set_free(cep);
+ }
+ break;
+
+ case SIW_CM_WORK_CLOSE_LLP:
+ /*
+ * QP scheduled LLP close
+ */
+ dprint(DBG_CM, "(): SIW_CM_WORK_CLOSE_LLP, cep->state=%d\n",
+ cep->state);
+
+ cep->state = SIW_EPSTATE_CLOSED;
+
+ if (cep->llp.sock) {
+ siw_socket_disassoc(cep->llp.sock);
+ sock_release(cep->llp.sock);
+ cep->llp.sock = NULL;
+ }
+ if (cep->qp) {
+ siw_qp_llp_close(cep->qp);
+ siw_qp_put(cep->qp);
+ cep->qp = NULL;
+ }
+ if (cep->cm_id) {
+ siw_cm_upcall(cep, IW_CM_EVENT_CLOSE,
+ IW_CM_EVENT_STATUS_OK);
+
+ cep->cm_id->rem_ref(cep->cm_id);
+ cep->cm_id = NULL;
+ siw_cep_put(cep);
+ }
+ break;
+
+ case SIW_CM_WORK_PEER_CLOSE:
+
+ dprint(DBG_CM, "(): SIW_CM_WORK_PEER_CLOSE, "
+ "cep->state=%d\n", cep->state);
+
+ if (cep->cm_id) {
+ switch (cep->state) {
+
+ case SIW_EPSTATE_AWAIT_MPAREP:
+ /*
+ * MPA reply not received, but connection drop
+ */
+ siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY,
+ -ECONNRESET);
+ break;
+
+ case SIW_EPSTATE_RDMA_MODE:
+ /*
+ * NOTE: IW_CM_EVENT_DISCONNECT is given just
+ * to transition IWCM into CLOSING.
+ * FIXME: is that needed?
+ */
+ siw_cm_upcall(cep, IW_CM_EVENT_DISCONNECT,
+ IW_CM_EVENT_STATUS_OK);
+ siw_cm_upcall(cep, IW_CM_EVENT_CLOSE,
+ IW_CM_EVENT_STATUS_OK);
+
+ break;
+
+ default:
+
+ break;
+ /*
+ * for these states there is no connection
+ * known to the IWCM. Even not for
+ * SIW_EPSTATE_RECVD_MPAREQ.
+ */
+ }
+ cep->cm_id->rem_ref(cep->cm_id);
+ cep->cm_id = NULL;
+ siw_cep_put(cep);
+ }
+ if (cep->qp) {
+ siw_qp_llp_close(cep->qp);
+ siw_qp_put(cep->qp);
+ cep->qp = NULL;
+ }
+ if (cep->state != SIW_EPSTATE_CLOSED) {
+ cep->state = SIW_EPSTATE_CLOSED;
+ siw_socket_disassoc(cep->llp.sock);
+ sock_release(cep->llp.sock);
+ cep->llp.sock = NULL;
+ }
+
+ break;
+
+ default:
+ BUG();
+ }
+ dprint(DBG_CM, " (Exit): WORK type: %d, CEP: 0x%p\n", work->type, 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);
+
+ dprint(DBG_CM, " (QP%d): WORK type: %d, CEP: 0x%p\n",
+ cep->qp ? QP_ID(cep->qp) : -1, type, cep);
+
+ if (!work) {
+ dprint(DBG_ON, " Failed\n");
+ return -ENOMEM;
+ }
+ work->type = type;
+ work->cep = cep;
+
+ siw_cep_get(cep);
+
+ INIT_WORK(&work->work, siw_cm_work_handler);
+ queue_work(siw_cm_wq, &work->work);
+
+ return 0;
+}
+
+
+static void siw_cm_llp_data_ready(struct sock *sk, int flags)
+{
+ struct siw_cep *cep;
+
+ read_lock(&sk->sk_callback_lock);
+
+ cep = sk_to_cep(sk);
+ if (!cep) {
+ WARN_ON(1);
+ goto out;
+ }
+
+ if (cep->conn_close)
+ goto out;
+
+ dprint(DBG_CM, "(): cep 0x%p, state: %d, flags %x\n", cep,
+ cep->state, flags);
+
+ 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:
+ dprint(DBG_CM, "(): 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)
+ dprint(DBG_CM, "(): cep: 0x%p, state: %d\n", cep, cep->state);
+}
+
+static void siw_cm_llp_error_report(struct sock *sk)
+{
+ struct siw_cep *cep = sk_to_cep(sk);
+
+ dprint(DBG_CM, "(): error: %d, state: %d\n", sk->sk_err, sk->sk_state);
+
+ if (cep) {
+ cep->sk_error = sk->sk_err;
+ dprint(DBG_CM, "(): cep->state: %d\n", cep->state);
+ cep->sk_error_report(sk);
+ }
+}
+
+static void siw_cm_llp_state_change(struct sock *sk)
+{
+ struct siw_cep *cep;
+ struct socket *s;
+ void (*orig_state_change)(struct sock *);
+
+
+ read_lock(&sk->sk_callback_lock);
+
+ cep = sk_to_cep(sk);
+ if (!cep) {
+ WARN_ON(1);
+ read_unlock(&sk->sk_callback_lock);
+ return;
+ }
+ orig_state_change = cep->sk_state_change;
+
+ s = sk->sk_socket;
+
+ dprint(DBG_CM, "(): cep: 0x%p, state: %d\n", cep, cep->state);
+
+ switch (sk->sk_state) {
+
+ case TCP_ESTABLISHED:
+ /*
+ * handle accepting socket as special case where only
+ * new connection is possible
+ */
+ if (cep->conn_close)
+ break;
+
+ if (cep->state == SIW_EPSTATE_LISTENING &&
+ siw_cm_queue_work(cep, SIW_CM_WORK_ACCEPT) != 0) {
+ dprint(DBG_ON, "Cannot accept\n");
+ }
+ break;
+
+ case TCP_CLOSE:
+ case TCP_CLOSE_WAIT:
+ if (cep->state <= SIW_EPSTATE_LISTENING) {
+ dprint(DBG_CM, "() Close before accept()\n");
+ break;
+ }
+ if (cep->qp)
+ cep->qp->tx_ctx.tx_suspend = 1;
+
+ if (!siw_cep_in_close(cep))
+ siw_cm_queue_work(cep, SIW_CM_WORK_PEER_CLOSE);
+
+ break;
+
+ default:
+ dprint(DBG_CM, "Unexpected sock 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, int laddrlen,
+ struct sockaddr *raddr, int raddrlen, int flags)
+{
+ int err, s_val = 1;
+ /*
+ * XXX
+ * Tentative fix. Should not be needed but sometimes iwcm
+ * chooses ports in use
+ */
+ err = kernel_setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char *)&s_val,
+ sizeof s_val);
+ if (err < 0)
+ goto done;
+
+ err = s->ops->bind(s, laddr, laddrlen);
+ if (err < 0)
+ goto done;
+
+ err = s->ops->connect(s, raddr, raddrlen, flags);
+ if (err < 0)
+ goto done;
+
+ err = s->ops->getname(s, laddr, &s_val, 0);
+
+done:
+ return err;
+}
+
+
+int siw_connect(struct iw_cm_id *id, struct iw_cm_conn_param *params)
+{
+ struct siw_dev *dev = siw_dev_ofa2siw(id->device);
+ struct siw_qp *qp;
+ struct siw_cep *cep = NULL;
+ struct socket *s = NULL;
+ struct sockaddr *laddr, *raddr;
+
+ u16 pd_len = params->private_data_len;
+ int rv, size;
+
+ if (pd_len > MPA_MAX_PRIVDATA)
+ return -EINVAL;
+
+ qp = siw_qp_id2obj(dev, params->qpn);
+ BUG_ON(!qp);
+
+ dprint(DBG_CM, "(id=0x%p, QP%d): dev(id)=%s, l2dev=%s\n",
+ id, QP_ID(qp), dev->ofa_dev.name, dev->l2dev->name);
+ dprint(DBG_CM, "(id=0x%p, QP%d): laddr=(0x%x,%d), raddr=(0x%x,%d)\n",
+ id, QP_ID(qp),
+ ntohl(id->local_addr.sin_addr.s_addr),
+ ntohs(id->local_addr.sin_port),
+ ntohl(id->remote_addr.sin_addr.s_addr),
+ ntohs(id->remote_addr.sin_port));
+
+ down_write(&qp->state_lock);
+ if (qp->attrs.state > SIW_QP_STATE_RTR) {
+ rv = -EINVAL;
+ goto error;
+ }
+
+ laddr = (struct sockaddr *)&id->local_addr;
+ raddr = (struct sockaddr *)&id->remote_addr;
+
+ rv = sock_create(AF_INET, SOCK_STREAM, IPPROTO_TCP, &s);
+ if (rv < 0)
+ goto error;
+
+ size = SOCKBUFSIZE;
+ rv = kernel_setsockopt(s, SOL_SOCKET, SO_SNDBUF, (char *)&size,
+ sizeof size);
+ if (rv < 0)
+ goto error;
+
+ rv = kernel_setsockopt(s, SOL_SOCKET, SO_RCVBUF, (char *)&size,
+ sizeof size);
+ 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, sizeof *laddr, raddr,
+ sizeof *raddr, 0);
+ if (rv != 0) {
+ dprint(DBG_CM, "(id=0x%p, QP%d): kernel_bindconnect: rv=%d\n",
+ id, QP_ID(qp), rv);
+ goto error;
+ }
+ rv = siw_sock_nodelay(s);
+ if (rv != 0) {
+ dprint(DBG_CM, "(id=0x%p, QP%d): siw_sock_nodelay(): rv=%d\n",
+ id, QP_ID(qp), rv);
+ goto error;
+ }
+ cep = siw_cep_alloc();
+ if (!cep) {
+ rv = -ENOMEM;
+ goto error;
+ }
+
+ /* 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;
+
+ rv = siw_cm_alloc_work(cep, 4);
+ if (rv != 0) {
+ rv = -ENOMEM;
+ goto error;
+ }
+ cep->mpa.hdr.params.pd_len = pd_len;
+ cep->ird = params->ird;
+ cep->ord = params->ord;
+ cep->state = SIW_EPSTATE_CONNECTING;
+
+ rv = kernel_peername(s, &cep->llp.raddr);
+ if (rv)
+ goto error;
+
+ rv = kernel_localname(s, &cep->llp.laddr);
+ if (rv)
+ goto error;
+
+ dprint(DBG_CM, "(id=0x%p, QP%d): pd_len = %u\n", id, QP_ID(qp), pd_len);
+ if (pd_len)
+ dprint(DBG_CM, "%d bytes private_data\n", pd_len);
+ /*
+ * Associate CEP with socket
+ */
+ siw_cep_socket_assoc(cep, s);
+
+ cep->state = SIW_EPSTATE_AWAIT_MPAREP;
+
+ rv = siw_send_mpareqrep(cep->llp.sock, &cep->mpa.hdr.params,
+ MPA_KEY_REQ, (char *)params->private_data);
+
+ /*
+ * Reset private data len: in case connection drops w/o peer
+ * sending MPA reply we would report stale data pointer during
+ * IW_CM_EVENT_CONNECT_REPLY.
+ */
+ cep->mpa.hdr.params.pd_len = 0;
+
+ if (rv >= 0) {
+ dprint(DBG_CM, "(id=0x%p, QP%d): Exit\n", id, QP_ID(qp));
+ up_write(&qp->state_lock);
+ return 0;
+ }
+error:
+ up_write(&qp->state_lock);
+
+ dprint(DBG_ON, " Failed: %d\n", rv);
+
+ if (cep && !siw_cep_in_close(cep)) {
+
+ siw_socket_disassoc(s);
+ sock_release(s);
+ cep->llp.sock = NULL;
+
+ cep->qp = NULL;
+
+ cep->cm_id = NULL;
+ id->rem_ref(id);
+ siw_cep_put(cep);
+
+ qp->cep = NULL;
+ siw_cep_put(cep);
+
+ cep->state = SIW_EPSTATE_CLOSED;
+ } else if (!cep && s)
+ sock_release(s);
+
+ 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_dev *dev = siw_dev_ofa2siw(id->device);
+ struct siw_cep *cep = (struct siw_cep *)id->provider_data;
+ struct siw_qp *qp;
+ struct siw_qp_attrs qp_attrs;
+ char *pdata = NULL;
+ int rv;
+
+retry:
+ rv = siw_cep_set_inuse(cep);
+ if (rv < 0) {
+ dprint(DBG_CM, "(id=0x%p, cep=0x%p): CEP in use\n", id, cep);
+ wait_event(cep->waitq, !cep->in_use);
+ goto retry;
+ }
+ if (!rv) {
+ dprint(DBG_CM, "(id=0x%p, cep=0x%p): CEP in close\n", id, cep);
+ (void) siw_cep_set_free(cep);
+ return -EINVAL;
+ }
+ if (cep->state != SIW_EPSTATE_RECVD_MPAREQ) {
+ if (cep->state == SIW_EPSTATE_CLOSED) {
+
+ dprint(DBG_CM, "(id=0x%p): Out of State\n", id);
+ (void) siw_cep_set_free(cep);
+
+ siw_cep_put(cep);
+ return -ECONNRESET;
+ }
+ BUG();
+ }
+ /* clear iwcm reference to CEP from IW_CM_EVENT_CONNECT_REQUEST */
+ siw_cep_put(cep);
+
+ qp = siw_qp_id2obj(dev, params->qpn);
+ BUG_ON(!qp); /* The OFA core should prevent this */
+
+ down_write(&qp->state_lock);
+ if (qp->attrs.state > SIW_QP_STATE_RTR) {
+ rv = -EINVAL;
+ goto unlock;
+ }
+
+ dprint(DBG_CM, "(id=0x%p, QP%d): dev(id)=%s\n",
+ id, QP_ID(qp), dev->ofa_dev.name);
+
+ if (params->ord > qp->attrs.ord || params->ird > qp->attrs.ird) {
+ dprint(DBG_CM|DBG_ON, "(id=0x%p, QP%d): "
+ "ORD: %d (max: %d), IRD: %d (max: %d)\n",
+ id, QP_ID(qp),
+ params->ord, qp->attrs.ord,
+ params->ird, qp->attrs.ird);
+ rv = -EINVAL;
+ goto unlock;
+ }
+ if (params->private_data_len > MPA_MAX_PRIVDATA) {
+ dprint(DBG_CM|DBG_ON, "(id=0x%p, QP%d): "
+ "Private data too long: %d (max: %d)\n",
+ id, QP_ID(qp),
+ params->private_data_len, MPA_MAX_PRIVDATA);
+ rv = -EINVAL;
+ goto unlock;
+ }
+ cep->cm_id = id;
+ id->add_ref(id);
+
+ memset(&qp_attrs, 0, sizeof qp_attrs);
+ qp_attrs.ord = params->ord;
+ qp_attrs.ird = params->ird;
+ qp_attrs.llp_stream_handle = cep->llp.sock;
+
+ /*
+ * TODO: Add MPA negotiation
+ */
+ qp_attrs.mpa.marker_rcv = 0;
+ qp_attrs.mpa.marker_snd = 0;
+ qp_attrs.mpa.crc = CONFIG_RDMA_SIW_CRC_ENFORCED;
+ qp_attrs.mpa.version = 0;
+ qp_attrs.state = SIW_QP_STATE_RTS;
+
+ dprint(DBG_CM, "(id=0x%p, QP%d): Moving to RTS\n", id, 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;
+
+
+ /*
+ * TODO: It might be more elegant and concise to check the
+ * private data length cep->mpa.hdr.params.pd_len
+ * inside siw_send_mpareqrep().
+ */
+ if (params->private_data_len) {
+ pdata = (char *)params->private_data;
+
+ dprint(DBG_CM, "(id=0x%p, QP%d): %d bytes private_data\n",
+ id, QP_ID(qp), params->private_data_len);
+ }
+ cep->mpa.hdr.params.pd_len = params->private_data_len;
+
+ dprint(DBG_CM, "(id=0x%p, QP%d): Sending MPA Reply\n", id, QP_ID(qp));
+
+ rv = siw_send_mpareqrep(cep->llp.sock, &cep->mpa.hdr.params,
+ MPA_KEY_REP, pdata);
+ if (!rv) {
+ /*
+ * FIXME: In order to ensure that the first FPDU will be sent
+ * from the RDMA Initiator side, the "connection established"
+ * event should be delayed until Softiwarp has received the
+ * first FPDU from the RDMA Initiator side.
+ * Alternatively, Softiwarp could prevent this side to
+ * send a first FPDU until a first FPDU has been received.
+ *
+ * The two alternatives above will work if
+ * (1) the RDMA application is iWARP standards compliant
+ * by sending its first RDMA payload from the
+ * RDMA Initiator side, or
+ * (2) the RDMA Initiator side RNIC inserts an under-cover
+ * zero-length RDMA operation (negotiated through an
+ * extended MPA Request/Reply handshake) such as a
+ * zero-length RDMA Write or Read.
+ * Note that (2) would require an extension of the MPA RFC.
+ *
+ * A third alternative (which may be the easiest for now) is to
+ * return an error to an RDMA application that attempts to send
+ * the first RDMA payload from the RDMA Responder side.
+ */
+ siw_cm_upcall(cep, IW_CM_EVENT_ESTABLISHED,
+ IW_CM_EVENT_STATUS_OK);
+
+ if (!siw_cep_set_free(cep))
+ siw_cm_release(cep);
+
+ dprint(DBG_CM, "(id=0x%p, QP%d): Exit\n", id, QP_ID(qp));
+ return 0;
+ }
+
+error:
+ if (siw_cep_set_free(cep)) {
+
+ siw_socket_disassoc(cep->llp.sock);
+ sock_release(cep->llp.sock);
+ cep->llp.sock = NULL;
+
+ cep->state = SIW_EPSTATE_CLOSED;
+
+ 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);
+ }
+ return rv;
+unlock:
+ up_write(&qp->state_lock);
+ goto error;
+}
+
+/*
+ * 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 plen)
+{
+ struct siw_cep *cep = (struct siw_cep *)id->provider_data;
+
+ dprint(DBG_CM, "(id=0x%p): cep->state=%d\n", id, cep->state);
+ dprint(DBG_CM, " Reject: %s\n", plen ? (char *)pdata:"(no data)");
+
+ if (!siw_cep_in_close(cep)) {
+
+ dprint(DBG_ON, " Sending REJECT not yet implemented\n");
+
+ siw_socket_disassoc(cep->llp.sock);
+ sock_release(cep->llp.sock);
+ cep->llp.sock = NULL;
+
+ siw_cep_put(cep);
+ cep->state = SIW_EPSTATE_CLOSED;
+ } else {
+ dprint(DBG_CM, " (id=0x%p): Connection lost\n", id);
+ }
+
+ /*
+ * clear iwcm reference to CEP from
+ * IW_CM_EVENT_CONNECT_REQUEST
+ */
+ siw_cep_put(cep);
+
+ return 0;
+}
+
+int siw_listen_address(struct iw_cm_id *id, int backlog, struct sockaddr *laddr)
+{
+ struct socket *s;
+ struct siw_cep *cep = NULL;
+ int rv = 0, s_val;
+
+ rv = sock_create(AF_INET, SOCK_STREAM, IPPROTO_TCP, &s);
+ if (rv < 0) {
+ dprint(DBG_CM|DBG_ON, "(id=0x%p): ERROR: "
+ "sock_create(): rv=%d\n", id, rv);
+ return rv;
+ }
+
+ s_val = SOCKBUFSIZE;
+ rv = kernel_setsockopt(s, SOL_SOCKET, SO_SNDBUF, (char *)&s_val,
+ sizeof s_val);
+ if (rv)
+ goto error;
+
+ rv = kernel_setsockopt(s, SOL_SOCKET, SO_RCVBUF, (char *)&s_val,
+ sizeof s_val);
+ if (rv)
+ goto error;
+
+ /*
+ * Probably to be removed later. Allows binding
+ * local port when still in TIME_WAIT from last close.
+ */
+ s_val = 1;
+ rv = kernel_setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char *)&s_val,
+ sizeof s_val);
+ if (rv != 0) {
+ dprint(DBG_CM|DBG_ON, "(id=0x%p): ERROR: "
+ "kernel_setsockopt(): rv=%d\n", id, rv);
+ goto error;
+ }
+
+ rv = s->ops->bind(s, laddr, sizeof *laddr);
+ if (rv != 0) {
+ dprint(DBG_CM|DBG_ON, "(id=0x%p): ERROR: bind(): rv=%d\n",
+ id, rv);
+ goto error;
+ }
+
+ cep = siw_cep_alloc();
+ if (!cep) {
+ rv = -ENOMEM;
+ goto error;
+ }
+ siw_cep_socket_assoc(cep, s);
+
+ rv = siw_cm_alloc_work(cep, backlog);
+ if (rv != 0) {
+ dprint(DBG_CM|DBG_ON, "(id=0x%p): ERROR: "
+ "siw_cm_alloc_work(backlog=%d): rv=%d\n",
+ id, backlog, rv);
+ goto error;
+ }
+
+ rv = s->ops->listen(s, backlog);
+ if (rv != 0) {
+ dprint(DBG_CM|DBG_ON, "(id=0x%p): ERROR: listen() rv=%d\n",
+ id, rv);
+ goto error;
+ }
+
+ /*
+ * TODO: Do we really need the copies of local_addr and remote_addr
+ * in CEP ???
+ */
+ memcpy(&cep->llp.laddr, &id->local_addr, sizeof cep->llp.laddr);
+ memcpy(&cep->llp.raddr, &id->remote_addr, sizeof cep->llp.raddr);
+
+ 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 a 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);
+ }
+
+ dprint(DBG_CM, "(id=0x%p): dev(id)=%s, l2dev=%s, "
+ "id->provider_data=0x%p, cep=0x%p\n",
+ id, id->device->name,
+ siw_dev_ofa2siw(id->device)->l2dev->name,
+ id->provider_data, cep);
+
+ list_add_tail(&cep->list, (struct list_head *)id->provider_data);
+ cep->state = SIW_EPSTATE_LISTENING;
+ return 0;
+
+error:
+ dprint(DBG_ON, " Failed: %d\n", rv);
+
+ if (cep) {
+ cep->llp.sock = NULL;
+ siw_socket_disassoc(s);
+ cep->state = SIW_EPSTATE_CLOSED;
+ siw_cep_put(cep);
+ }
+ sock_release(s);
+ return rv;
+}
+
+
+/*
+ * siw_create_listen - Create resources for a listener's IWCM ID @id
+ *
+ * Listens on the socket addresses id->local_addr and id->remote_addr.
+ * We support listening on multi-homed devices, i.e., Softiwarp devices
+ * whose underlying net_device is associated with multiple IP addresses.
+ * Wildcard listening (listening with zero IP address) is also supported.
+ *
+ * There are three design options for Softiwarp device management supporting
+ * - multiple physical Ethernet ports, i.e., multiple net_device instances, and
+ * - multiple IP addresses associated with net_device,
+ * as follows:
+ *
+ * Option 1: One Softiwarp device per net_device and
+ * IP address associated with the net_device
+ * Option 2: One Softiwarp device per net_device
+ * (and all IP addresses associated with the net_device)
+ * Option 3: Single Softiwarp device for all net_device instances
+ * (and all IP addresses associated with these instances)
+ *
+ * We currently use Option 2, registering a separate siw_dev for
+ * each net_device. Consequently, siw_create_listen() (called separately
+ * by the IWCM for each Softiwarp device) handles the associated IP address(es)
+ * as follows:
+ *
+ * - If the listener's @id provides a specific local IP address, at most one
+ * listening socket is created and associated with @id.
+ *
+ * - If the listener's @id provides the wildcard (zero) local IP address,
+ * a separate listen is performed for each local IP address of the device
+ * by creating a listening socket and binding to that local IP address.
+ * This avoids attempts to bind to the wildcard (zero) IP address
+ * on multiple devices, which fails with -EADDRINUSE on the second and
+ * all subsequent devices.
+ *
+ * For the given IWCM and Option 2 above, the alternative approach of doing
+ * a single wildcard listen by creating one listening socket and binding it
+ * to the wildcard IP address is not a good idea if
+ * - there is more than one Softiwarp device (e.g., for lo and eth0), or
+ * - there are non-Softiwarp iWARP devices that cannot cooperate.
+ */
+int siw_create_listen(struct iw_cm_id *id, int backlog)
+{
+ struct ib_device *ofa_dev = id->device;
+ struct siw_dev *dev = siw_dev_ofa2siw(ofa_dev);
+ int rv = 0;
+
+ dprint(DBG_CM, "(id=0x%p): dev(id)=%s, l2dev=%s backlog=%d\n",
+ id, ofa_dev->name, dev->l2dev->name, backlog);
+
+ /*
+ * IPv4/v6 design differences regarding multi-homing
+ * propagate up to iWARP:
+ * o For IPv4, use dev->l2dev->ip_ptr
+ * o For IPv6, use dev->l2dev->ipv6_ptr
+ */
+ if (id->local_addr.sin_family == AF_INET) {
+ /* IPv4 */
+ struct sockaddr_in laddr = id->local_addr;
+ u8 *l_ip, *r_ip;
+ struct in_device *in_dev;
+
+ l_ip = (u8 *) &id->local_addr.sin_addr.s_addr;
+ r_ip = (u8 *) &id->remote_addr.sin_addr.s_addr;
+ dprint(DBG_CM, "(id=0x%p): "
+ "laddr(id) : ipv4=%d.%d.%d.%d, port=%d; "
+ "raddr(id) : ipv4=%d.%d.%d.%d, port=%d\n",
+ id,
+ l_ip[0], l_ip[1], l_ip[2], l_ip[3],
+ ntohs(id->local_addr.sin_port),
+ r_ip[0], r_ip[1], r_ip[2], r_ip[3],
+ ntohs(id->remote_addr.sin_port));
+
+ in_dev = in_dev_get(dev->l2dev);
+ if (!in_dev) {
+ dprint(DBG_CM|DBG_ON, "(id=0x%p): "
+ "l2dev has no in_device\n", id);
+ return -ENODEV;
+ }
+
+ /*
+ * If in_dev is not configured, in_dev->ifa_list may be empty
+ */
+ for_ifa(in_dev) {
+ /*
+ * Create a listening socket if id->local_addr
+ * contains the wildcard IP address OR
+ * the IP address of the interface.
+ */
+ if (ipv4_is_zeronet(id->local_addr.sin_addr.s_addr) ||
+ id->local_addr.sin_addr.s_addr ==
+ ifa->ifa_address) {
+ laddr.sin_addr.s_addr = ifa->ifa_address;
+
+ l_ip = (u8 *) &laddr.sin_addr.s_addr;
+ dprint(DBG_CM, "(id=0x%p): "
+ "laddr(bind): ipv4=%d.%d.%d.%d,"
+ " port=%d\n", id,
+ l_ip[0], l_ip[1], l_ip[2],
+ l_ip[3], ntohs(laddr.sin_port));
+
+ rv = siw_listen_address(id, backlog,
+ (struct sockaddr *)&laddr);
+ if (rv)
+ break;
+ }
+ }
+ endfor_ifa(in_dev);
+ in_dev_put(in_dev);
+
+ if (rv) {
+ /*
+ * TODO: Cleanup resources already associated with
+ * id->provider_data
+ */
+ dprint(DBG_CM|DBG_ON, "(id=0x%p): "
+ "TODO: Cleanup resources\n", id);
+ }
+
+ } else {
+ /* IPv6 */
+ dprint(DBG_CM|DBG_ON, "(id=0x%p): TODO: IPv6 support\n", id);
+ }
+ if (!rv)
+ dprint(DBG_CM, "(id=0x%p): Success\n", id);
+
+ return rv;
+}
+
+
+int siw_destroy_listen(struct iw_cm_id *id)
+{
+ struct list_head *p, *tmp;
+ struct siw_cep *cep;
+
+ dprint(DBG_CM, "(id=0x%p): dev(id)=%s, l2dev=%s\n",
+ id, id->device->name,
+ siw_dev_ofa2siw(id->device)->l2dev->name);
+
+ if (!id->provider_data) {
+ /*
+ * TODO: See if there's a way to avoid getting any
+ * listener ids without a list of CEPs
+ */
+ dprint(DBG_CM, "(id=0x%p): Listener id: no CEP(s)\n", id);
+ return 0;
+ }
+
+ /*
+ * 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) {
+
+ cep = list_entry(p, struct siw_cep, list);
+ list_del(p);
+
+ if (siw_cep_set_inuse(cep) > 0) {
+
+ cep->conn_close = 1;
+
+ siw_socket_disassoc(cep->llp.sock);
+ sock_release(cep->llp.sock);
+ cep->llp.sock = NULL;
+ id->rem_ref(id);
+
+ cep->state = SIW_EPSTATE_CLOSED;
+ /*
+ * Do not set the CEP free again. The CEP is dead.
+ * (void) siw_cep_set_free(cep);
+ */
+ } else
+ cep->state = SIW_EPSTATE_CLOSED;
+
+ siw_cep_put(cep);
+ }
+ kfree(id->provider_data);
+ id->provider_data = NULL;
+
+ return 0;
+}
+
+int __init 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 __exit siw_cm_exit(void)
+{
+ if (siw_cm_wq) {
+ flush_workqueue(siw_cm_wq);
+ destroy_workqueue(siw_cm_wq);
+ }
+}
diff --git a/drivers/infiniband/hw/siw/siw_cm.h b/drivers/infiniband/hw/siw/siw_cm.h
new file mode 100644
index 0000000..fcb4544
--- /dev/null
+++ b/drivers/infiniband/hw/siw/siw_cm.h
@@ -0,0 +1,155 @@
+/*
+ * Software iWARP device driver for Linux
+ *
+ * Authors: Bernard Metzler <bmt@...ich.ibm.com>
+ *
+ * Copyright (c) 2008-2010, IBM Corporation
+ *
+ * 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
+ * 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.
+ *
+ * - Neither the name of IBM nor the names of its contributors may be
+ * used to endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * 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.
+ */
+
+#ifndef _SIW_CM_H
+#define _SIW_CM_H
+
+#include <net/sock.h>
+#include <linux/tcp.h>
+
+#include <rdma/iw_cm.h>
+
+
+enum siw_cep_state {
+ SIW_EPSTATE_IDLE = 1,
+ SIW_EPSTATE_LISTENING,
+ SIW_EPSTATE_CONNECTING,
+ SIW_EPSTATE_AWAIT_MPAREQ,
+ SIW_EPSTATE_RECVD_MPAREQ,
+ SIW_EPSTATE_AWAIT_MPAREP,
+ SIW_EPSTATE_RDMA_MODE,
+ SIW_EPSTATE_CLOSED
+};
+
+struct siw_mpa_info {
+ struct mpa_rr hdr; /* peer mpa hdr in host byte order */
+ char *pdata;
+ int bytes_rcvd;
+};
+
+struct siw_llp_info {
+ struct socket *sock;
+ struct sockaddr_in laddr; /* redundant with socket info above */
+ struct sockaddr_in raddr; /* dito, consider removal */
+ struct siw_sk_upcalls sk_def_upcalls;
+};
+
+struct siw_cep {
+ struct iw_cm_id *cm_id;
+
+ /*
+ * The provider_data element of a listener IWCM ID
+ * refers to a list of one or more listener CEPs
+ */
+ struct list_head list;
+
+ struct siw_cep *listen_cep;
+ struct siw_qp *qp;
+ spinlock_t lock;
+ wait_queue_head_t waitq;
+ struct kref ref;
+ enum siw_cep_state state;
+ short conn_close; /* sched. for closing or closed */
+ short in_use;
+ struct siw_cm_work *mpa_timer;
+ struct list_head work_freelist;
+ struct siw_llp_info llp;
+ struct siw_mpa_info mpa;
+ int ord;
+ int ird;
+ int sk_error; /* not (yet) used XXX */
+
+ /* Saved upcalls of socket llp.sock */
+ void (*sk_state_change)(struct sock *sk);
+ void (*sk_data_ready)(struct sock *sk, int bytes);
+ void (*sk_write_space)(struct sock *sk);
+ void (*sk_error_report)(struct sock *sk);
+};
+
+enum siw_work_type {
+ SIW_CM_WORK_ACCEPT = 1,
+ SIW_CM_WORK_READ_MPAHDR,
+ SIW_CM_WORK_CLOSE_LLP, /* close socket */
+ SIW_CM_WORK_PEER_CLOSE, /* socket indicated peer close */
+ SIW_CM_WORK_MPATIMEOUT /* to be done ! */
+};
+
+struct siw_cm_work {
+ struct work_struct work;
+ struct list_head list;
+ enum siw_work_type type;
+ struct siw_cep *cep;
+};
+
+extern int siw_connect(struct iw_cm_id *, struct iw_cm_conn_param *);
+extern int siw_accept(struct iw_cm_id *, struct iw_cm_conn_param *);
+extern int siw_reject(struct iw_cm_id *, const void *, u8);
+extern int siw_create_listen(struct iw_cm_id *, int);
+extern int siw_destroy_listen(struct iw_cm_id *);
+
+extern int siw_cm_upcall(struct siw_cep *, enum iw_cm_event_type,
+ enum iw_cm_event_status);
+
+extern void siw_cep_upcall(struct siw_cep *, enum iw_cm_event_type);
+
+extern void siw_cep_put(struct siw_cep *);
+extern void siw_cep_get(struct siw_cep *);
+extern int siw_cep_in_close(struct siw_cep *);
+
+extern int siw_cm_queue_work(struct siw_cep *, enum siw_work_type);
+
+extern int siw_cm_init(void);
+extern void siw_cm_exit(void);
+
+/*
+ * TCP socket interface
+ */
+#define sk_to_qp(sk) (((struct siw_cep *)((sk)->sk_user_data))->qp)
+#define sk_to_cep(sk) ((struct siw_cep *)((sk)->sk_user_data))
+
+/*
+ * Should we use tcp_current_mss()?
+ * But its not exported by kernel.
+ */
+static inline unsigned int get_tcp_mss(struct sock *sk)
+{
+ return ((struct tcp_sock *)sk)->xmit_size_goal_segs *
+ ((struct tcp_sock *)sk)->mss_cache;
+}
+
+#endif
--
1.5.4.3
--
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