- 根目录:
- net
- rds
- iw_cm.c
/*
* Copyright (c) 2006 Oracle. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
*/
#include <linux/kernel.h>
#include <linux/in.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/ratelimit.h>
#include "rds.h"
#include "iw.h"
/*
* Set the selected protocol version
*/
static void rds_iw_set_protocol(struct rds_connection *conn, unsigned int version)
{
conn->c_version = version;
}
/*
* Set up flow control
*/
static void rds_iw_set_flow_control(struct rds_connection *conn, u32 credits)
{
struct rds_iw_connection *ic = conn->c_transport_data;
if (rds_iw_sysctl_flow_control && credits != 0) {
/* We're doing flow control */
ic->i_flowctl = 1;
rds_iw_send_add_credits(conn, credits);
} else {
ic->i_flowctl = 0;
}
}
/*
* Connection established.
* We get here for both outgoing and incoming connection.
*/
void rds_iw_cm_connect_complete(struct rds_connection *conn, struct rdma_cm_event *event)
{
const struct rds_iw_connect_private *dp = NULL;
struct rds_iw_connection *ic = conn->c_transport_data;
struct rds_iw_device *rds_iwdev;
int err;
if (event->param.conn.private_data_len) {
dp = event->param.conn.private_data;
rds_iw_set_protocol(conn,
RDS_PROTOCOL(dp->dp_protocol_major,
dp->dp_protocol_minor));
rds_iw_set_flow_control(conn, be32_to_cpu(dp->dp_credit));
}
/* update ib_device with this local ipaddr & conn */
rds_iwdev = ib_get_client_data(ic->i_cm_id->device, &rds_iw_client);
err = rds_iw_update_cm_id(rds_iwdev, ic->i_cm_id);
if (err)
printk(KERN_ERR "rds_iw_update_ipaddr failed (%d)\n", err);
rds_iw_add_conn(rds_iwdev, conn);
/* If the peer gave us the last packet it saw, process this as if
* we had received a regular ACK. */
if (dp && dp->dp_ack_seq)
rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL);
printk(KERN_NOTICE "RDS/IW: connected to %pI4<->%pI4 version %u.%u%s\n",
&conn->c_laddr, &conn->c_faddr,
RDS_PROTOCOL_MAJOR(conn->c_version),
RDS_PROTOCOL_MINOR(conn->c_version),
ic->i_flowctl ? ", flow control" : "");
rds_connect_complete(conn);
}
static void rds_iw_cm_fill_conn_param(struct rds_connection *conn,
struct rdma_conn_param *conn_param,
struct rds_iw_connect_private *dp,
u32 protocol_version)
{
struct rds_iw_connection *ic = conn->c_transport_data;
memset(conn_param, 0, sizeof(struct rdma_conn_param));
/* XXX tune these? */
conn_param->responder_resources = 1;
conn_param->initiator_depth = 1;
if (dp) {
memset(dp, 0, sizeof(*dp));
dp->dp_saddr = conn->c_laddr;
dp->dp_daddr = conn->c_faddr;
dp->dp_protocol_major = RDS_PROTOCOL_MAJOR(protocol_version);
dp->dp_protocol_minor = RDS_PROTOCOL_MINOR(protocol_version);
dp->dp_protocol_minor_mask = cpu_to_be16(RDS_IW_SUPPORTED_PROTOCOLS);
dp->dp_ack_seq = rds_iw_piggyb_ack(ic);
/* Advertise flow control */
if (ic->i_flowctl) {
unsigned int credits;
credits = IB_GET_POST_CREDITS(atomic_read(&ic->i_credits));
dp->dp_credit = cpu_to_be32(credits);
atomic_sub(IB_SET_POST_CREDITS(credits), &ic->i_credits);
}
conn_param->private_data = dp;
conn_param->private_data_len = sizeof(*dp);
}
}
static void rds_iw_cq_event_handler(struct ib_event *event, void *data)
{
rdsdebug("event %u data %p\n", event->event, data);
}
static void rds_iw_qp_event_handler(struct ib_event *event, void *data)
{
struct rds_connection *conn = data;
struct rds_iw_connection *ic = conn->c_transport_data;
rdsdebug("conn %p ic %p event %u\n", conn, ic, event->event);
switch (event->event) {
case IB_EVENT_COMM_EST:
rdma_notify(ic->i_cm_id, IB_EVENT_COMM_EST);
break;
case IB_EVENT_QP_REQ_ERR:
case IB_EVENT_QP_FATAL:
default:
rdsdebug("Fatal QP Event %u "
"- connection %pI4->%pI4, reconnecting\n",
event->event, &conn->c_laddr,
&conn->c_faddr);
rds_conn_drop(conn);
break;
}
}
/*
* Create a QP
*/
static int rds_iw_init_qp_attrs(struct ib_qp_init_attr *attr,
struct rds_iw_device *rds_iwdev,
struct rds_iw_work_ring *send_ring,
void (*send_cq_handler)(struct ib_cq *, void *),
struct rds_iw_work_ring *recv_ring,
void (*recv_cq_handler)(struct ib_cq *, void *),
void *context)
{
struct ib_device *dev = rds_iwdev->dev;
unsigned int send_size, recv_size;
int ret;
/* The offset of 1 is to accommodate the additional ACK WR. */
send_size = min_t(unsigned int, rds_iwdev->max_wrs, rds_iw_sysctl_max_send_wr + 1);
recv_size = min_t(unsigned int, rds_iwdev->max_wrs, rds_iw_sysctl_max_recv_wr + 1);
rds_iw_ring_resize(send_ring, send_size - 1);
rds_iw_ring_resize(recv_ring, recv_size - 1);
memset(attr, 0, sizeof(*attr));
attr->event_handler = rds_iw_qp_event_handler;
attr->qp_context = context;
attr->cap.max_send_wr = send_size;
attr->cap.max_recv_wr = recv_size;
attr->cap.max_send_sge = rds_iwdev->max_sge;
attr->cap.max_recv_sge = RDS_IW_RECV_SGE;
attr->sq_sig_type = IB_SIGNAL_REQ_WR;
attr->qp_type = IB_QPT_RC;
attr->send_cq = ib_create_cq(dev, send_cq_handler,
rds_iw_cq_event_handler,
context, send_size, 0);
if (IS_ERR(attr->send_cq)) {
ret = PTR_ERR(attr->send_cq);
attr->send_cq = NULL;
rdsdebug("ib_create_cq send failed: %d\n", ret);
goto out;
}
attr->recv_cq = ib_create_cq(dev, recv_cq_handler,
rds_iw_cq_event_handler,
context, recv_size, 0);
if (IS_ERR(attr->recv_cq)) {
ret = PTR_ERR(attr->recv_cq);
attr->recv_cq = NULL;
rdsdebug("ib_create_cq send failed: %d\n", ret);
goto out;
}
ret = ib_req_notify_cq(attr->send_cq, IB_CQ_NEXT_COMP);
if (ret) {
rdsdebug("ib_req_notify_cq send failed: %d\n", ret);
goto out;
}
ret = ib_req_notify_cq(attr->recv_cq, IB_CQ_SOLICITED);
if (ret) {
rdsdebug("ib_req_notify_cq recv failed: %d\n", ret);
goto out;
}
out:
if (ret) {
if (attr->send_cq)
ib_destroy_cq(attr->send_cq);
if (attr->recv_cq)
ib_destroy_cq(attr->recv_cq);
}
return ret;
}
/*
* This needs to be very careful to not leave IS_ERR pointers around for
* cleanup to trip over.
*/
static int rds_iw_setup_qp(struct rds_connection *conn)
{
struct rds_iw_connection *ic = conn->c_transport_data;
struct ib_device *dev = ic->i_cm_id->device;
struct ib_qp_init_attr attr;
struct rds_iw_device *rds_iwdev;
int ret;
/* rds_iw_add_one creates a rds_iw_device object per IB device,
* and allocates a protection domain, memory range and MR pool
* for each. If that fails for any reason, it will not register
* the rds_iwdev at all.
*/
rds_iwdev = ib_get_client_data(dev, &rds_iw_client);
if (!rds_iwdev) {
printk_ratelimited(KERN_NOTICE "RDS/IW: No client_data for device %s\n",
dev->name);
return -EOPNOTSUPP;
}
/* Protection domain and memory range */
ic->i_pd = rds_iwdev->pd;
ic->i_mr = rds_iwdev->mr;
ret = rds_iw_init_qp_attrs(&attr, rds_iwdev,
&ic->i_send_ring, rds_iw_send_cq_comp_handler,
&ic->i_recv_ring, rds_iw_recv_cq_comp_handler,
conn);
if (ret < 0)
goto out;
ic->i_send_cq = attr.send_cq;
ic->i_recv_cq = attr.recv_cq;
/*
* XXX this can fail if max_*_wr is too large? Are we supposed
* to back off until we get a value that the hardware can support?
*/
ret = rdma_create_qp(ic->i_cm_id, ic->i_pd, &attr);
if (ret) {
rdsdebug("rdma_create_qp failed: %d\n", ret);
goto out;
}
ic->i_send_hdrs = ib_dma_alloc_coherent(dev,
ic->i_send_ring.w_nr *
sizeof(struct rds_header),
&ic->i_send_hdrs_dma, GFP_KERNEL);
if (!ic->i_send_hdrs) {
ret = -ENOMEM;
rdsdebug("ib_dma_alloc_coherent send failed\n");
goto out;
}
ic->i_recv_hdrs = ib_dma_alloc_coherent(dev,
ic->i_recv_ring.w_nr *
sizeof(struct rds_header),
&ic->i_recv_hdrs_dma, GFP_KERNEL);
if (!ic->i_recv_hdrs) {
ret = -ENOMEM;
rdsdebug("ib_dma_alloc_coherent recv failed\n");
goto out;
}
ic->i_ack = ib_dma_alloc_coherent(dev, sizeof(struct rds_header),
&ic->i_ack_dma, GFP_KERNEL);
if (!ic->i_ack) {
ret = -ENOMEM;
rdsdebug("ib_dma_alloc_coherent ack failed\n");
goto out;
}
ic->i_sends = vmalloc(ic->i_send_ring.w_nr * sizeof(struct rds_iw_send_work));
if (!ic->i_sends) {
ret = -ENOMEM;
rdsdebug("send allocation failed\n");
goto out;
}
rds_iw_send_init_ring(ic);
ic->i_recvs = vmalloc(ic->i_recv_ring.w_nr * sizeof(struct rds_iw_recv_work));
if (!ic->i_recvs) {
ret = -ENOMEM;
rdsdebug("recv allocation failed\n");
goto out;
}
rds_iw_recv_init_ring(ic);
rds_iw_recv_init_ack(ic);
/* Post receive buffers - as a side effect, this will update
* the posted credit count. */
rds_iw_recv_refill(conn, GFP_KERNEL, GFP_HIGHUSER, 1);
rdsdebug("conn %p pd %p mr %p cq %p %p\n", conn, ic->i_pd, ic->i_mr,
ic->i_send_cq, ic->i_recv_cq);
out:
return ret;
}
static u32 rds_iw_protocol_compatible(const struct rds_iw_connect_private *dp)
{
u16 common;
u32 version = 0;
/* rdma_cm private data is odd - when there is any private data in the
* request, we will be given a pretty large buffer without telling us the
* original size. The only way to tell the difference is by looking at
* the contents, which are initialized to zero.
* If the protocol version fields aren't set, this is a connection attempt
* from an older version. This could could be 3.0 or 2.0 - we can't tell.
* We really should have changed this for OFED 1.3 :-( */
if (dp->dp_protocol_major == 0)
return RDS_PROTOCOL_3_0;
common = be16_to_cpu(dp->dp_protocol_minor_mask) & RDS_IW_SUPPORTED_PROTOCOLS;
if (dp->dp_protocol_major == 3 && common) {
version = RDS_PROTOCOL_3_0;
while ((common >>= 1) != 0)
version++;
}
printk_ratelimited(KERN_NOTICE "RDS: Connection from %pI4 using "
"incompatible protocol version %u.%u\n",
&dp->dp_saddr,
dp->dp_protocol_major,
dp->dp_protocol_minor);
return version;
}
int rds_iw_cm_handle_connect(struct rdma_cm_id *cm_id,
struct rdma_cm_event *event)
{
const struct rds_iw_connect_private *dp = event->param.conn.private_data;
struct rds_iw_connect_private dp_rep;
struct rds_connection *conn = NULL;
struct rds_iw_connection *ic = NULL;
struct rdma_conn_param conn_param;
struct rds_iw_device *rds_iwdev;
u32 version;
int err, destroy = 1;
/* Check whether the remote protocol version matches ours. */
version = rds_iw_protocol_compatible(dp);
if (!version)
goto out;
rdsdebug("saddr %pI4 daddr %pI4 RDSv%u.%u\n",
&dp->dp_saddr, &dp->dp_daddr,
RDS_PROTOCOL_MAJOR(version), RDS_PROTOCOL_MINOR(version));
conn = rds_conn_create(dp->dp_daddr, dp->dp_saddr, &rds_iw_transport,
GFP_KERNEL);
if (IS_ERR(conn)) {
rdsdebug("rds_conn_create failed (%ld)\n", PTR_ERR(conn));
conn = NULL;
goto out;
}
/*
* The connection request may occur while the
* previous connection exist, e.g. in case of failover.
* But as connections may be initiated simultaneously
* by both hosts, we have a random backoff mechanism -
* see the comment above rds_queue_reconnect()
*/
mutex_lock(&conn->c_cm_lock);
if (!rds_conn_transition(conn, RDS_CONN_DOWN, RDS_CONN_CONNECTING)) {
if (rds_conn_state(conn) == RDS_CONN_UP) {
rdsdebug("incoming connect while connecting\n");
rds_conn_drop(conn);
rds_iw_stats_inc(s_iw_listen_closed_stale);
} else
if (rds_conn_state(conn) == RDS_CONN_CONNECTING) {
/* Wait and see - our connect may still be succeeding */
rds_iw_stats_inc(s_iw_connect_raced);
}
mutex_unlock(&conn->c_cm_lock);
goto out;
}
ic = conn->c_transport_data;
rds_iw_set_protocol(conn, version);
rds_iw_set_flow_control(conn, be32_to_cpu(dp->dp_credit));
/* If the peer gave us the last packet it saw, process this as if
* we had received a regular ACK. */
if (dp->dp_ack_seq)
rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL);
BUG_ON(cm_id->context);
BUG_ON(ic->i_cm_id);
ic->i_cm_id = cm_id;
cm_id->context = conn;
rds_iwdev = ib_get_client_data(cm_id->device, &rds_iw_client);
ic->i_dma_local_lkey = rds_iwdev->dma_local_lkey;
/* We got halfway through setting up the ib_connection, if we
* fail now, we have to take the long route out of this mess. */
destroy = 0;
err = rds_iw_setup_qp(conn);
if (err) {
rds_iw_conn_error(conn, "rds_iw_setup_qp failed (%d)\n", err);
mutex_unlock(&conn->c_cm_lock);
goto out;
}
rds_iw_cm_fill_conn_param(conn, &conn_param, &dp_rep, version);
/* rdma_accept() calls rdma_reject() internally if it fails */
err = rdma_accept(cm_id, &conn_param);
mutex_unlock(&conn->c_cm_lock);
if (err) {
rds_iw_conn_error(conn, "rdma_accept failed (%d)\n", err);
goto out;
}
return 0;
out:
rdma_reject(cm_id, NULL, 0);
return destroy;
}
int rds_iw_cm_initiate_connect(struct rdma_cm_id *cm_id)
{
struct rds_connection *conn = cm_id->context;
struct rds_iw_connection *ic = conn->c_transport_data;
struct rdma_conn_param conn_param;
struct rds_iw_connect_private dp;
int ret;
/* If the peer doesn't do protocol negotiation, we must
* default to RDSv3.0 */
rds_iw_set_protocol(conn, RDS_PROTOCOL_3_0);
ic->i_flowctl = rds_iw_sysctl_flow_control; /* advertise flow control */
ret = rds_iw_setup_qp(conn);
if (ret) {
rds_iw_conn_error(conn, "rds_iw_setup_qp failed (%d)\n", ret);
goto out;
}
rds_iw_cm_fill_conn_param(conn, &conn_param, &dp, RDS_PROTOCOL_VERSION);
ret = rdma_connect(cm_id, &conn_param);
if (ret)
rds_iw_conn_error(conn, "rdma_connect failed (%d)\n", ret);
out:
/* Beware - returning non-zero tells the rdma_cm to destroy
* the cm_id. We should certainly not do it as long as we still
* "own" the cm_id. */
if (ret) {
struct rds_iw_connection *ic = conn->c_transport_data;
if (ic->i_cm_id == cm_id)
ret = 0;
}
return ret;
}
int rds_iw_conn_connect(struct rds_connection *conn)
{
struct rds_iw_connection *ic = conn->c_transport_data;
struct rds_iw_device *rds_iwdev;
struct sockaddr_in src, dest;
int ret;
/* XXX I wonder what affect the port space has */
/* delegate cm event handler to rdma_transport */
ic->i_cm_id = rdma_create_id(rds_rdma_cm_event_handler, conn,
RDMA_PS_TCP, IB_QPT_RC);
if (IS_ERR(ic->i_cm_id)) {
ret = PTR_ERR(ic->i_cm_id);
ic->i_cm_id = NULL;
rdsdebug("rdma_create_id() failed: %d\n", ret);
goto out;
}
rdsdebug("created cm id %p for conn %p\n", ic->i_cm_id, conn);
src.sin_family = AF_INET;
src.sin_addr.s_addr = (__force u32)conn->c_laddr;
src.sin_port = (__force u16)htons(0);
/* First, bind to the local address and device. */
ret = rdma_bind_addr(ic->i_cm_id, (struct sockaddr *) &src);
if (ret) {
rdsdebug("rdma_bind_addr(%pI4) failed: %d\n",
&conn->c_laddr, ret);
rdma_destroy_id(ic->i_cm_id);
ic->i_cm_id = NULL;
goto out;
}
rds_iwdev = ib_get_client_data(ic->i_cm_id->device, &rds_iw_client);
ic->i_dma_local_lkey = rds_iwdev->dma_local_lkey;
dest.sin_family = AF_INET;
dest.sin_addr.s_addr = (__force u32)conn->c_faddr;
dest.sin_port = (__force u16)htons(RDS_PORT);
ret = rdma_resolve_addr(ic->i_cm_id, (struct sockaddr *)&src,
(struct sockaddr *)&dest,
RDS_RDMA_RESOLVE_TIMEOUT_MS);
if (ret) {
rdsdebug("addr resolve failed for cm id %p: %d\n", ic->i_cm_id,
ret);
rdma_destroy_id(ic->i_cm_id);
ic->i_cm_id = NULL;
}
out:
return ret;
}
/*
* This is so careful about only cleaning up resources that were built up
* so that it can be called at any point during startup. In fact it
* can be called multiple times for a given connection.
*/
void rds_iw_conn_shutdown(struct rds_connection *conn)
{
struct rds_iw_connection *ic = conn->c_transport_data;
int err = 0;
struct ib_qp_attr qp_attr;
rdsdebug("cm %p pd %p cq %p %p qp %p\n", ic->i_cm_id,
ic->i_pd, ic->i_send_cq, ic->i_recv_cq,
ic->i_cm_id ? ic->i_cm_id->qp : NULL);
if (ic->i_cm_id) {
struct ib_device *dev = ic->i_cm_id->device;
rdsdebug("disconnecting cm %p\n", ic->i_cm_id);
err = rdma_disconnect(ic->i_cm_id);
if (err) {
/* Actually this may happen quite frequently, when
* an outgoing connect raced with an incoming connect.
*/
rdsdebug("rds_iw_conn_shutdown: failed to disconnect,"
" cm: %p err %d\n", ic->i_cm_id, err);
}
if (ic->i_cm_id->qp) {
qp_attr.qp_state = IB_QPS_ERR;
ib_modify_qp(ic->i_cm_id->qp, &qp_attr, IB_QP_STATE);
}
wait_event(rds_iw_ring_empty_wait,
rds_iw_ring_empty(&ic->i_send_ring) &&
rds_iw_ring_empty(&ic->i_recv_ring));
if (ic->i_send_hdrs)
ib_dma_free_coherent(dev,
ic->i_send_ring.w_nr *
sizeof(struct rds_header),
ic->i_send_hdrs,
ic->i_send_hdrs_dma);
if (ic->i_recv_hdrs)
ib_dma_free_coherent(dev,
ic->i_recv_ring.w_nr *
sizeof(struct rds_header),
ic->i_recv_hdrs,
ic->i_recv_hdrs_dma);
if (ic->i_ack)
ib_dma_free_coherent(dev, sizeof(struct rds_header),
ic->i_ack, ic->i_ack_dma);
if (ic->i_sends)
rds_iw_send_clear_ring(ic);
if (ic->i_recvs)
rds_iw_recv_clear_ring(ic);
if (ic->i_cm_id->qp)
rdma_destroy_qp(ic->i_cm_id);
if (ic->i_send_cq)
ib_destroy_cq(ic->i_send_cq);
if (ic->i_recv_cq)
ib_destroy_cq(ic->i_recv_cq);
/*
* If associated with an rds_iw_device:
* Move connection back to the nodev list.
* Remove cm_id from the device cm_id list.
*/
if (ic->rds_iwdev)
rds_iw_remove_conn(ic->rds_iwdev, conn);
rdma_destroy_id(ic->i_cm_id);
ic->i_cm_id = NULL;
ic->i_pd = NULL;
ic->i_mr = NULL;
ic->i_send_cq = NULL;
ic->i_recv_cq = NULL;
ic->i_send_hdrs = NULL;
ic->i_recv_hdrs = NULL;
ic->i_ack = NULL;
}
BUG_ON(ic->rds_iwdev);
/* Clear pending transmit */
if (ic->i_rm) {
rds_message_put(ic->i_rm);
ic->i_rm = NULL;
}
/* Clear the ACK state */
clear_bit(IB_ACK_IN_FLIGHT, &ic->i_ack_flags);
#ifdef KERNEL_HAS_ATOMIC64
atomic64_set(&ic->i_ack_next, 0);
#else
ic->i_ack_next = 0;
#endif
ic->i_ack_recv = 0;
/* Clear flow control state */
ic->i_flowctl = 0;
atomic_set(&ic->i_credits, 0);
rds_iw_ring_init(&ic->i_send_ring, rds_iw_sysctl_max_send_wr);
rds_iw_ring_init(&ic->i_recv_ring, rds_iw_sysctl_max_recv_wr);
if (ic->i_iwinc) {
rds_inc_put(&ic->i_iwinc->ii_inc);
ic->i_iwinc = NULL;
}
vfree(ic->i_sends);
ic->i_sends = NULL;
vfree(ic->i_recvs);
ic->i_recvs = NULL;
rdsdebug("shutdown complete\n");
}
int rds_iw_conn_alloc(struct rds_connection *conn, gfp_t gfp)
{
struct rds_iw_connection *ic;
unsigned long flags;
/* XXX too lazy? */
ic = kzalloc(sizeof(struct rds_iw_connection), gfp);
if (!ic)
return -ENOMEM;
INIT_LIST_HEAD(&ic->iw_node);
tasklet_init(&ic->i_recv_tasklet, rds_iw_recv_tasklet_fn,
(unsigned long) ic);
mutex_init(&ic->i_recv_mutex);
#ifndef KERNEL_HAS_ATOMIC64
spin_lock_init(&ic->i_ack_lock);
#endif
/*
* rds_iw_conn_shutdown() waits for these to be emptied so they
* must be initialized before it can be called.
*/
rds_iw_ring_init(&ic->i_send_ring, rds_iw_sysctl_max_send_wr);
rds_iw_ring_init(&ic->i_recv_ring, rds_iw_sysctl_max_recv_wr);
ic->conn = conn;
conn->c_transport_data = ic;
spin_lock_irqsave(&iw_nodev_conns_lock, flags);
list_add_tail(&ic->iw_node, &iw_nodev_conns);
spin_unlock_irqrestore(&iw_nodev_conns_lock, flags);
rdsdebug("conn %p conn ic %p\n", conn, conn->c_transport_data);
return 0;
}
/*
* Free a connection. Connection must be shut down and not set for reconnect.
*/
void rds_iw_conn_free(void *arg)
{
struct rds_iw_connection *ic = arg;
spinlock_t *lock_ptr;
rdsdebug("ic %p\n", ic);
/*
* Conn is either on a dev's list or on the nodev list.
* A race with shutdown() or connect() would cause problems
* (since rds_iwdev would change) but that should never happen.
*/
lock_ptr = ic->rds_iwdev ? &ic->rds_iwdev->spinlock : &iw_nodev_conns_lock;
spin_lock_irq(lock_ptr);
list_del(&ic->iw_node);
spin_unlock_irq(lock_ptr);
kfree(ic);
}
/*
* An error occurred on the connection
*/
void
__rds_iw_conn_error(struct rds_connection *conn, const char *fmt, ...)
{
va_list ap;
rds_conn_drop(conn);
va_start(ap, fmt);
vprintk(fmt, ap);
va_end(ap);
}