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Message-ID: <46FC03B8.1030106@opengridcomputing.com>
Date: Thu, 27 Sep 2007 14:25:44 -0500
From: Steve Wise <swise@...ngridcomputing.com>
To: Sean Hefty <mshefty@...ips.intel.com>
CC: rdreier@...co.com, sean.hefty@...el.com, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org, general@...ts.openfabrics.org
Subject: Re: [ofa-general] [PATCH v3] iw_cxgb3: Support "iwarp-only" interfaces
to avoid 4-tuple conflicts.
Sean Hefty wrote:
>> The sysadmin creates "for iwarp use only" alias interfaces of the form
>> "devname:iw*" where devname is the native interface name (eg eth0) for
>> the
>> iwarp netdev device. The alias label can be anything starting with "iw".
>> The "iw" immediately after the ':' is the key used by the iw_cxgb3
>> driver.
>
> I'm still not sure about this, but haven't come up with anything better
> myself. And if there's a good chance of other rnic's needing the same
> support, I'd rather see the common code separated out, even if just
> encapsulated within this module for easy re-use.
>
> As for the code, I have a couple of questions about whether deadlock and
> a race condition are possible, plus a few minor comments.
>
Thanks for reviewing! Responses are in-line below.
>> +static void insert_ifa(struct iwch_dev *rnicp, struct in_ifaddr *ifa)
>> +{
>> + struct iwch_addrlist *addr;
>> +
>> + addr = kmalloc(sizeof *addr, GFP_KERNEL);
>> + if (!addr) {
>> + printk(KERN_ERR MOD "%s - failed to alloc memory!\n",
>> + __FUNCTION__);
>> + return;
>> + }
>> + addr->ifa = ifa;
>> + mutex_lock(&rnicp->mutex);
>> + list_add_tail(&addr->entry, &rnicp->addrlist);
>> + mutex_unlock(&rnicp->mutex);
>> +}
>
> Should this return success/failure?
>
I think so. See below...
>> +static int nb_callback(struct notifier_block *self, unsigned long event,
>> + void *ctx)
>> +{
>> + struct in_ifaddr *ifa = ctx;
>> + struct iwch_dev *rnicp = container_of(self, struct iwch_dev, nb);
>> +
>> + PDBG("%s rnicp %p event %lx\n", __FUNCTION__, rnicp, event);
>> +
>> + switch (event) {
>> + case NETDEV_UP:
>> + if (netdev_is_ours(rnicp, ifa->ifa_dev->dev) &&
>> + is_iwarp_label(ifa->ifa_label)) {
>> + PDBG("%s label %s addr 0x%x added\n",
>> + __FUNCTION__, ifa->ifa_label, ifa->ifa_address);
>> + insert_ifa(rnicp, ifa);
>> + iwch_listeners_add_addr(rnicp, ifa->ifa_address);
>
> If insert_ifa() fails, what will iwch_listeners_add_addr() do? (I'm not
> easily seeing the relationship between the address list and the listen
> list at this point.)
>
I guess insert_ifa() needs to return success/failure. Then if we failed
to add the ifa to the list we won't update the listeners.
The relationship is this:
- when a listen is done on addr 0.0.0.0, the code walks the list of
addresses to do specific listens on each address.
- when an address is added or deleted, then the list of current
listeners is walked and updated accordingly.
>> + }
>> + break;
>> + case NETDEV_DOWN:
>> + if (netdev_is_ours(rnicp, ifa->ifa_dev->dev) &&
>> + is_iwarp_label(ifa->ifa_label)) {
>> + PDBG("%s label %s addr 0x%x deleted\n",
>> + __FUNCTION__, ifa->ifa_label, ifa->ifa_address);
>> + iwch_listeners_del_addr(rnicp, ifa->ifa_address);
>> + remove_ifa(rnicp, ifa);
>> + }
>> + break;
>> + default:
>> + break;
>> + }
>> + return 0;
>> +}
>> +
>> +static void delete_addrlist(struct iwch_dev *rnicp)
>> +{
>> + struct iwch_addrlist *addr, *tmp;
>> +
>> + mutex_lock(&rnicp->mutex);
>> + list_for_each_entry_safe(addr, tmp, &rnicp->addrlist, entry) {
>> + list_del(&addr->entry);
>> + kfree(addr);
>> + }
>> + mutex_unlock(&rnicp->mutex);
>> +}
>> +
>> +static void populate_addrlist(struct iwch_dev *rnicp)
>> +{
>> + int i;
>> + struct in_device *indev;
>> +
>> + for (i = 0; i < rnicp->rdev.port_info.nports; i++) {
>> + indev = in_dev_get(rnicp->rdev.port_info.lldevs[i]);
>> + if (!indev)
>> + continue;
>> + for_ifa(indev)
>> + if (is_iwarp_label(ifa->ifa_label)) {
>> + PDBG("%s label %s addr 0x%x added\n",
>> + __FUNCTION__, ifa->ifa_label,
>> + ifa->ifa_address);
>> + insert_ifa(rnicp, ifa);
>> + }
>> + endfor_ifa(indev);
>> + }
>> +}
>> +
>> static void rnic_init(struct iwch_dev *rnicp)
>> {
>> PDBG("%s iwch_dev %p\n", __FUNCTION__, rnicp);
>> @@ -70,6 +187,12 @@ static void rnic_init(struct iwch_dev *r
>> idr_init(&rnicp->qpidr);
>> idr_init(&rnicp->mmidr);
>> spin_lock_init(&rnicp->lock);
>> + INIT_LIST_HEAD(&rnicp->addrlist);
>> + INIT_LIST_HEAD(&rnicp->listen_eps);
>> + mutex_init(&rnicp->mutex);
>> + rnicp->nb.notifier_call = nb_callback;
>> + populate_addrlist(rnicp);
>> + register_inetaddr_notifier(&rnicp->nb);
>>
>> rnicp->attr.vendor_id = 0x168;
>> rnicp->attr.vendor_part_id = 7;
>> @@ -148,6 +271,8 @@ static void close_rnic_dev(struct t3cdev
>> mutex_lock(&dev_mutex);
>> list_for_each_entry_safe(dev, tmp, &dev_list, entry) {
>> if (dev->rdev.t3cdev_p == tdev) {
>> + unregister_inetaddr_notifier(&dev->nb);
>> + delete_addrlist(dev);
>> list_del(&dev->entry);
>> iwch_unregister_device(dev);
>> cxio_rdev_close(&dev->rdev);
>> diff --git a/drivers/infiniband/hw/cxgb3/iwch.h
>> b/drivers/infiniband/hw/cxgb3/iwch.h
>> index caf4e60..7fa0a47 100644
>> --- a/drivers/infiniband/hw/cxgb3/iwch.h
>> +++ b/drivers/infiniband/hw/cxgb3/iwch.h
>> @@ -36,6 +36,8 @@ #include <linux/mutex.h>
>> #include <linux/list.h>
>> #include <linux/spinlock.h>
>> #include <linux/idr.h>
>> +#include <linux/notifier.h>
>> +#include <linux/inetdevice.h>
>>
>> #include <rdma/ib_verbs.h>
>>
>> @@ -101,6 +103,11 @@ struct iwch_rnic_attributes {
>> u32 cq_overflow_detection;
>> };
>>
>> +struct iwch_addrlist {
>> + struct list_head entry;
>> + struct in_ifaddr *ifa;
>> +};
>> +
>> struct iwch_dev {
>> struct ib_device ibdev;
>> struct cxio_rdev rdev;
>> @@ -111,6 +118,10 @@ struct iwch_dev {
>> struct idr mmidr;
>> spinlock_t lock;
>> struct list_head entry;
>> + struct notifier_block nb;
>> + struct list_head addrlist;
>> + struct list_head listen_eps;
>
> The behavior of the listen lists is similar to what's done in the
> rdma_cm: Wildcard listens are stored in a listen_any_list. When new
> devices are added, associated listens are added to each device. This is
> similar, except we're dealing with devices and addresses. I'm wondering
> if we shouldn't mimic the same behavior and track listens in
> iwch_addrlist directly. (I don't see anything wrong with this approach
> though.)
>
> What happens if an address changes between iwarp only and non-iwarp?
>
That results in a NETDEV_DOWN event indicating the iwarp only address is
getting deleted. All the affected listening endpoints are updated to
stop listening on that address. A NETDEV_UP event would happen when the
ipaddress is switched over to the TCP interface, but our callback
function ignores this since the interface name is not ethX:iw.
> How are listens on specific addresses handled from an rdma_cm level?
> Does the rdma_cm map the address to the device, call the iw_cm to
> listen, which in turn calls the device listen function?
Yes.
> The device then
> checks that the address has been marked as iwarp only? (I'm being too
> lazy to trace this through the code, but if you don't know off the top
> of your head, I will do that.)
Actually, I don't enforce this. If the app explicitly binds/listens to
a non-iwarp address, then the code happily allows it. I could fail this
case though. That would be best I guess.
>
>> + struct mutex mutex;
>> };
>>
>> static inline struct iwch_dev *to_iwch_dev(struct ib_device *ibdev)
>> diff --git a/drivers/infiniband/hw/cxgb3/iwch_cm.c
>> b/drivers/infiniband/hw/cxgb3/iwch_cm.c
>> index 1cdfcd4..afc8a48 100644
>> --- a/drivers/infiniband/hw/cxgb3/iwch_cm.c
>> +++ b/drivers/infiniband/hw/cxgb3/iwch_cm.c
>> @@ -1127,23 +1127,149 @@ static int act_open_rpl(struct t3cdev *t
>> return CPL_RET_BUF_DONE;
>> }
>>
>> -static int listen_start(struct iwch_listen_ep *ep)
>> +static int wait_for_reply(struct iwch_ep_common *epc)
>> +{
>> + PDBG("%s ep %p waiting\n", __FUNCTION__, epc);
>> + wait_event(epc->waitq, epc->rpl_done);
>> + PDBG("%s ep %p done waiting err %d\n", __FUNCTION__, epc,
>> epc->rpl_err);
>> + return epc->rpl_err;
>> +}
>
> What thread is being blocked here, and what sets the event?
>
The thread calling rdma_listen() gets blocked here until the rnic posts
a response to the listen request. Ditto for rdma_destroy_id() on a
listening endpoint. The event is set and the wakeup don in
pass_open_rpl() and close_listsrv_rpl().
>> +
>> +static struct iwch_listen_entry *alloc_listener(struct iwch_listen_ep
>> *ep,
>> + __be32 addr)
>> +{
>> + struct iwch_dev *h = to_iwch_dev(ep->com.cm_id->device);
>> + struct iwch_listen_entry *le;
>> +
>> + le = kmalloc(sizeof *le, GFP_KERNEL);
>> + if (!le) {
>> + printk(KERN_ERR MOD "%s - failed to alloc memory!\n",
>> + __FUNCTION__);
>> + return NULL;
>> + }
>> + le->stid = cxgb3_alloc_stid(h->rdev.t3cdev_p,
>> + &t3c_client, ep);
>> + if (le->stid == -1) {
>> + printk(KERN_ERR MOD "%s - cannot alloc stid.\n",
>> + __FUNCTION__);
>> + kfree(le);
>> + return NULL;
>> + }
>> + le->addr = addr;
>> + PDBG("%s stid %u addr %x port %x\n", __FUNCTION__, le->stid,
>> + ntohl(le->addr), ntohs(ep->com.local_addr.sin_port));
>> + return le;
>> +}
>> +
>> +static void dealloc_listener(struct iwch_listen_ep *ep,
>> + struct iwch_listen_entry *le)
>> +{
>> + PDBG("%s stid %u addr %x port %x\n", __FUNCTION__, le->stid,
>> + ntohl(le->addr), ntohs(ep->com.local_addr.sin_port));
>> + cxgb3_free_stid(ep->com.tdev, le->stid);
>> + kfree(le);
>> +}
>> +
>> +static void dealloc_listener_list(struct iwch_listen_ep *ep)
>> +{
>> + struct iwch_listen_entry *le, *tmp;
>> + struct iwch_dev *h = to_iwch_dev(ep->com.cm_id->device);
>> +
>> + mutex_lock(&h->mutex);
>> + list_for_each_entry_safe(le, tmp, &ep->listeners, entry) {
>> + list_del(&le->entry);
>> + dealloc_listener(ep, le);
>> + }
>> + mutex_unlock(&h->mutex);
>> +}
>> +
>> +static int alloc_listener_list(struct iwch_listen_ep *ep)
>> +{
>> + struct iwch_dev *h = to_iwch_dev(ep->com.cm_id->device);
>
> nit: in place of 'h' in several places, how about 'rnicp', which is also
> used?
>
>> + struct iwch_addrlist *addr;
>> + struct iwch_listen_entry *le;
>> + int err = 0;
>> + int added=0;
>> + mutex_lock(&h->mutex);
>> + list_for_each_entry(addr, &h->addrlist, entry) {
>> + if (ep->com.local_addr.sin_addr.s_addr == 0 ||
>> + ep->com.local_addr.sin_addr.s_addr ==
>> + addr->ifa->ifa_address) {
>> + le = alloc_listener(ep, addr->ifa->ifa_address);
>> + if (!le)
>> + break;
>> + list_add_tail(&le->entry, &ep->listeners);
>> + added++;
>> + }
>> + }
>> + mutex_unlock(&h->mutex);
>> + if (ep->com.local_addr.sin_addr.s_addr != 0 && !added)
>> + err = -EADDRNOTAVAIL;
>> + if (!err && !added)
>> + printk(KERN_WARNING MOD
>> + "No RDMA interface found for device %s\n",
>> + pci_name(h->rdev.rnic_info.pdev));
>> + return err;
>> +}
>
> Adding some white space would improve readability.
>
>> +
>> +static int listen_stop_one(struct iwch_listen_ep *ep, unsigned int
>> stid)
>> {
>> struct sk_buff *skb;
>> - struct cpl_pass_open_req *req;
>> + struct cpl_close_listserv_req *req;
>> +
>> + PDBG("%s stid %u\n", __FUNCTION__, stid);
>> + skb = get_skb(NULL, sizeof(*req), GFP_KERNEL);
>> + if (!skb) {
>> + printk(KERN_ERR MOD "%s - failed to alloc skb\n", __FUNCTION__);
>> + return -ENOMEM;
>> + }
>> + req = (struct cpl_close_listserv_req *) skb_put(skb, sizeof(*req));
>> + req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
>> + req->cpu_idx = 0;
>> + OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_CLOSE_LISTSRV_REQ, stid));
>> + skb->priority = 1;
>> + ep->com.rpl_err = 0;
>> + ep->com.rpl_done = 0;
>> + cxgb3_ofld_send(ep->com.tdev, skb);
>> + return wait_for_reply(&ep->com);
>> +}
>> +
>> +static int listen_stop(struct iwch_listen_ep *ep)
>> +{
>> + struct iwch_listen_entry *le;
>> + struct iwch_dev *h = to_iwch_dev(ep->com.cm_id->device);
>> + int err = 0;
>>
>> PDBG("%s ep %p\n", __FUNCTION__, ep);
>> + mutex_lock(&h->mutex);
>> + list_for_each_entry(le, &ep->listeners, entry) {
>> + err = listen_stop_one(ep, le->stid);
>
> This ends up blocking while holding a mutex, which looks like deadlock
> potential.
>
I don't think there are any deadlocks. I don't know how to avoid
blocking while holding the mutex. But its ok, I think.
>> + if (err)
>> + break;
>> + }
>> + mutex_unlock(&h->mutex);
>> + return err;
>> +}
>> +
>> +static int listen_start_one(struct iwch_listen_ep *ep, unsigned int
>> stid,
>> + __be32 addr, __be16 port)
>> +{
>> + struct sk_buff *skb;
>> + struct cpl_pass_open_req *req;
>> +
>> + PDBG("%s stid %u addr %x port %x\n", __FUNCTION__, stid,
>> ntohl(addr),
>> + ntohs(port));
>> skb = get_skb(NULL, sizeof(*req), GFP_KERNEL);
>> if (!skb) {
>> - printk(KERN_ERR MOD "t3c_listen_start failed to alloc skb!\n");
>> + printk(KERN_ERR MOD "%s - failed to alloc skb\n", __FUNCTION__);
>> return -ENOMEM;
>> }
>>
>> req = (struct cpl_pass_open_req *) skb_put(skb, sizeof(*req));
>> req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
>> - OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_PASS_OPEN_REQ, ep->stid));
>> - req->local_port = ep->com.local_addr.sin_port;
>> - req->local_ip = ep->com.local_addr.sin_addr.s_addr;
>> + OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_PASS_OPEN_REQ, stid));
>> + req->local_port = port;
>> + req->local_ip = addr;
>> req->peer_port = 0;
>> req->peer_ip = 0;
>> req->peer_netmask = 0;
>> @@ -1152,8 +1278,32 @@ static int listen_start(struct iwch_list
>> req->opt1 = htonl(V_CONN_POLICY(CPL_CONN_POLICY_ASK));
>>
>> skb->priority = 1;
>> + ep->com.rpl_err = 0;
>> + ep->com.rpl_done = 0;
>> cxgb3_ofld_send(ep->com.tdev, skb);
>> - return 0;
>> + return wait_for_reply(&ep->com);
>> +}
>> +
>> +static int listen_start(struct iwch_listen_ep *ep)
>> +{
>> + struct iwch_listen_entry *le;
>> + struct iwch_dev *h = to_iwch_dev(ep->com.cm_id->device);
>> + int err = 0;
>> +
>> + PDBG("%s ep %p\n", __FUNCTION__, ep);
>> + mutex_lock(&h->mutex);
>> + list_for_each_entry(le, &ep->listeners, entry) {
>> + err = listen_start_one(ep, le->stid, le->addr,
>> + ep->com.local_addr.sin_port);
>
> Similar to above - blocking while holding a mutex. There are a couple
> of other places where this also occurs.
It is ok to block while holding a mutex, yes?
>
>> + if (err)
>> + goto fail;
>> + }
>> + mutex_unlock(&h->mutex);
>> + return err;
>> +fail:
>> + mutex_unlock(&h->mutex);
>> + listen_stop(ep);
>> + return err;
>> }
>>
>> static int pass_open_rpl(struct t3cdev *tdev, struct sk_buff *skb,
>> void *ctx)
>> @@ -1170,39 +1320,59 @@ static int pass_open_rpl(struct t3cdev *
>> return CPL_RET_BUF_DONE;
>> }
>>
>> -static int listen_stop(struct iwch_listen_ep *ep)
>> -{
>> - struct sk_buff *skb;
>> - struct cpl_close_listserv_req *req;
>> -
>> - PDBG("%s ep %p\n", __FUNCTION__, ep);
>> - skb = get_skb(NULL, sizeof(*req), GFP_KERNEL);
>> - if (!skb) {
>> - printk(KERN_ERR MOD "%s - failed to alloc skb\n", __FUNCTION__);
>> - return -ENOMEM;
>> - }
>> - req = (struct cpl_close_listserv_req *) skb_put(skb, sizeof(*req));
>> - req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
>> - req->cpu_idx = 0;
>> - OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_CLOSE_LISTSRV_REQ,
>> ep->stid));
>> - skb->priority = 1;
>> - cxgb3_ofld_send(ep->com.tdev, skb);
>> - return 0;
>> -}
>> -
>> static int close_listsrv_rpl(struct t3cdev *tdev, struct sk_buff *skb,
>> void *ctx)
>> {
>> struct iwch_listen_ep *ep = ctx;
>> struct cpl_close_listserv_rpl *rpl = cplhdr(skb);
>>
>> - PDBG("%s ep %p\n", __FUNCTION__, ep);
>> + PDBG("%s ep %p stid %u\n", __FUNCTION__, ep, GET_TID(rpl));
>> +
>> ep->com.rpl_err = status2errno(rpl->status);
>> ep->com.rpl_done = 1;
>> wake_up(&ep->com.waitq);
>> return CPL_RET_BUF_DONE;
>> }
>>
>> +void iwch_listeners_add_addr(struct iwch_dev *rnicp, __be32 addr)
>> +{
>> + struct iwch_listen_ep *listen_ep;
>> + struct iwch_listen_entry *le;
>> +
>> + mutex_lock(&rnicp->mutex);
>> + list_for_each_entry(listen_ep, &rnicp->listen_eps, entry) {
>> + if (listen_ep->com.local_addr.sin_addr.s_addr)
>> + continue;
>> + le = alloc_listener(listen_ep, addr);
>> + if (le) {
>> + list_add_tail(&le->entry, &listen_ep->listeners);
>> + listen_start_one(listen_ep, le->stid, addr,
>> + listen_ep->com.local_addr.sin_port);
>> + }
>> + }
>> + mutex_unlock(&rnicp->mutex);
>> +}
>> +
>> +void iwch_listeners_del_addr(struct iwch_dev *rnicp, __be32 addr)
>> +{
>> + struct iwch_listen_ep *listen_ep;
>> + struct iwch_listen_entry *le, *tmp;
>> +
>> + mutex_lock(&rnicp->mutex);
>> + list_for_each_entry(listen_ep, &rnicp->listen_eps, entry) {
>> + if (listen_ep->com.local_addr.sin_addr.s_addr)
>> + continue;
>> + list_for_each_entry_safe(le, tmp, &listen_ep->listeners,
>> + entry)
>> + if (le->addr == addr) {
>> + listen_stop_one(listen_ep, le->stid);
>> + list_del(&le->entry);
>> + dealloc_listener(listen_ep, le);
>> + }
>> + }
>> + mutex_unlock(&rnicp->mutex);
>> +}
>> +
>> static void accept_cr(struct iwch_ep *ep, __be32 peer_ip, struct
>> sk_buff *skb)
>> {
>> struct cpl_pass_accept_rpl *rpl;
>> @@ -1767,8 +1937,7 @@ int iwch_accept_cr(struct iw_cm_id *cm_i
>> goto err;
>>
>> /* wait for wr_ack */
>> - wait_event(ep->com.waitq, ep->com.rpl_done);
>> - err = ep->com.rpl_err;
>> + err = wait_for_reply(&ep->com);
>> if (err)
>> goto err;
>>
>> @@ -1887,31 +2056,23 @@ int iwch_create_listen(struct iw_cm_id *
>> ep->com.cm_id = cm_id;
>> ep->backlog = backlog;
>> ep->com.local_addr = cm_id->local_addr;
>> + INIT_LIST_HEAD(&ep->listeners);
>>
>> - /*
>> - * Allocate a server TID.
>> - */
>> - ep->stid = cxgb3_alloc_stid(h->rdev.t3cdev_p, &t3c_client, ep);
>> - if (ep->stid == -1) {
>> - printk(KERN_ERR MOD "%s - cannot alloc atid.\n", __FUNCTION__);
>> - err = -ENOMEM;
>> + err = alloc_listener_list(ep);
>> + if (err)
>> goto fail2;
>> - }
>>
>> state_set(&ep->com, LISTEN);
>> err = listen_start(ep);
>> - if (err)
>> - goto fail3;
>>
>> - /* wait for pass_open_rpl */
>> - wait_event(ep->com.waitq, ep->com.rpl_done);
>> - err = ep->com.rpl_err;
>> if (!err) {
>> cm_id->provider_data = ep;
>> + mutex_lock(&h->mutex);
>> + list_add_tail(&ep->entry, &h->listen_eps);
>> + mutex_unlock(&h->mutex);
>
> Is there a race between listen_start() being called and inserting the ep
> into the list? Could anything try to find the ep on the list after
> listen_start returns?
>
I guess if the iwarp address was removed between after the
listen_start() and before we add it to the list, then we would not stop
the listen for this address. Perhaps I need to hold the mutex around
the listen_start() -and- the insert...
>> goto out;
>> }
>> -fail3:
>> - cxgb3_free_stid(ep->com.tdev, ep->stid);
>> + dealloc_listener_list(ep);
>> fail2:
>> cm_id->rem_ref(cm_id);
>> put_ep(&ep->com);
>> @@ -1923,18 +2084,20 @@ out:
>> int iwch_destroy_listen(struct iw_cm_id *cm_id)
>> {
>> int err;
>> + struct iwch_dev *h = to_iwch_dev(cm_id->device);
>> struct iwch_listen_ep *ep = to_listen_ep(cm_id);
>>
>> PDBG("%s ep %p\n", __FUNCTION__, ep);
>>
>> might_sleep();
>> + mutex_lock(&h->mutex);
>> + list_del(&ep->entry);
>> + mutex_unlock(&h->mutex);
>> state_set(&ep->com, DEAD);
>> ep->com.rpl_done = 0;
>> ep->com.rpl_err = 0;
>> err = listen_stop(ep);
>> - wait_event(ep->com.waitq, ep->com.rpl_done);
>> - cxgb3_free_stid(ep->com.tdev, ep->stid);
>> - err = ep->com.rpl_err;
>> + dealloc_listener_list(ep);
>> cm_id->rem_ref(cm_id);
>> put_ep(&ep->com);
>> return err;
>> diff --git a/drivers/infiniband/hw/cxgb3/iwch_cm.h
>> b/drivers/infiniband/hw/cxgb3/iwch_cm.h
>> index 6107e7c..23e5a22 100644
>> --- a/drivers/infiniband/hw/cxgb3/iwch_cm.h
>> +++ b/drivers/infiniband/hw/cxgb3/iwch_cm.h
>> @@ -162,10 +162,19 @@ struct iwch_ep_common {
>> int rpl_err;
>> };
>>
>> -struct iwch_listen_ep {
>> - struct iwch_ep_common com;
>> +struct iwch_listen_entry {
>> + struct list_head entry;
>> unsigned int stid;
>> + __be32 addr;
>> +};
>> +
>> +struct iwch_listen_ep {
>> + struct iwch_ep_common com; /* Must be first entry! */
>> + struct list_head entry;
>> + struct list_head listeners;
>> int backlog;
>> + int listen_count;
>
> I didn't notice where this was used.
>
>> + int listen_rpls;
>
> or this.
>
Yea, I think this is dead code. I'll remove these.
>> };
>>
>> struct iwch_ep {
>> @@ -222,6 +231,8 @@ int iwch_resume_tid(struct iwch_ep *ep);
>> void __free_ep(struct kref *kref);
>> void iwch_rearp(struct iwch_ep *ep);
>> int iwch_ep_redirect(void *ctx, struct dst_entry *old, struct
>> dst_entry *new, struct l2t_entry *l2t);
>> +void iwch_listeners_add_addr(struct iwch_dev *rnicp, __be32 addr);
>> +void iwch_listeners_del_addr(struct iwch_dev *rnicp, __be32 addr);
>>
>> int __init iwch_cm_init(void);
>> void __exit iwch_cm_term(void);
>> _______________________________________________
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>>
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>>
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