netdev - Re: [RFC PATCH 07/11] IB/Verbs: Use management helper has_mcast() and, cap

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Date:	Tue, 31 Mar 2015 09:25:45 +0200
From:	Michael Wang <yun.wang@...fitbricks.com>
To:	"ira.weiny" <ira.weiny@...el.com>
CC:	Doug Ledford <dledford@...hat.com>,
	Roland Dreier <roland@...nel.org>,
	Sean Hefty <sean.hefty@...el.com>,
	Hal Rosenstock <hal.rosenstock@...il.com>,
	linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-nfs@...r.kernel.org, netdev@...r.kernel.org,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Trond Myklebust <trond.myklebust@...marydata.com>,
	"David S. Miller" <davem@...emloft.net>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Moni Shoua <monis@...lanox.com>,
	PJ Waskiewicz <pj.waskiewicz@...idfire.com>,
	Tatyana Nikolova <Tatyana.E.Nikolova@...el.com>,
	Yan Burman <yanb@...lanox.com>,
	Jack Morgenstein <jackm@....mellanox.co.il>,
	Bart Van Assche <bvanassche@....org>,
	Yann Droneaud <ydroneaud@...eya.com>,
	Colin Ian King <colin.king@...onical.com>,
	Majd Dibbiny <majd@...lanox.com>,
	Jiri Kosina <jkosina@...e.cz>,
	Matan Barak <matanb@...lanox.com>,
	Alex Estrin <alex.estrin@...el.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Erez Shitrit <erezsh@...lanox.com>,
	Sagi Grimberg <sagig@...lanox.com>,
	Haggai Eran <haggaie@...lanox.com>,
	Shachar Raindel <raindel@...lanox.com>,
	Mike Marciniszyn <mike.marciniszyn@...el.com>,
	Steve Wise <swise@...ngridcomputing.com>,
	Tom Tucker <tom@....us>, Chuck Lever <chuck.lever@...cle.com>
Subject: Re: [RFC PATCH 07/11] IB/Verbs: Use management helper has_mcast()
 and, cap_mcast() for mcast-check

On 03/31/2015 01:47 AM, ira.weiny wrote:
> On Mon, Mar 30, 2015 at 06:20:48PM +0200, Michael Wang wrote:
>> [snip]
>>>> Cc: Jason Gunthorpe <jgunthorpe@...idianresearch.com>
>>>> Cc: Doug Ledford <dledford@...hat.com>
>>>> Cc: Ira Weiny <ira.weiny@...el.com>
>>>> Cc: Sean Hefty <sean.hefty@...el.com>
>>>> Signed-off-by: Michael Wang <yun.wang@...fitbricks.com>
>>>> ---
>>>>  drivers/infiniband/core/cma.c       |  2 +-
>>>>  drivers/infiniband/core/multicast.c |  8 ++++----
>>>>  include/rdma/ib_verbs.h             | 28 ++++++++++++++++++++++++++++
>>>>  3 files changed, 33 insertions(+), 5 deletions(-)
>>>>
>>>> diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
>>>> index 276fb76..cbbc85b 100644
>>>> --- a/drivers/infiniband/core/cma.c
>>>> +++ b/drivers/infiniband/core/cma.c
>>>> @@ -3398,7 +3398,7 @@ void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr)
>>>>                  ib_detach_mcast(id->qp,
>>>>                          &mc->multicast.ib->rec.mgid,
>>>>                          be16_to_cpu(mc->multicast.ib->rec.mlid));
>>>> -            if (rdma_transport_is_ib(id_priv->cma_dev->device)) {
>>>> +            if (has_mcast(id_priv->cma_dev->device)) {
>
> You need a similar check in rdma_join_multicast.
Thanks for the remind, I'll give it a reform :-)

Regards,
Michael Wang


>
> Ira
>
>
>>>>                  switch (rdma_port_get_link_layer(id->device, id->port_num)) {
>>>>                  case IB_LINK_LAYER_INFINIBAND:
>>>>                      ib_sa_free_multicast(mc->multicast.ib);
>>>> diff --git a/drivers/infiniband/core/multicast.c b/drivers/infiniband/core/multicast.c
>>>> index 17573ff..ffeaf27 100644
>>>> --- a/drivers/infiniband/core/multicast.c
>>>> +++ b/drivers/infiniband/core/multicast.c
>>>> @@ -780,7 +780,7 @@ static void mcast_event_handler(struct ib_event_handler *handler,
>>>>      int index;
>>>>  
>>>>      dev = container_of(handler, struct mcast_device, event_handler);
>>>> -    if (!rdma_port_ll_is_ib(dev->device, event->element.port_num))
>>>> +    if (!cap_mcast(dev->device, event->element.port_num))
>>>>          return;
>>>>  
>>>>      index = event->element.port_num - dev->start_port;
>>>> @@ -807,7 +807,7 @@ static void mcast_add_one(struct ib_device *device)
>>>>      int i;
>>>>      int count = 0;
>>>>  
>>>> -    if (!rdma_transport_is_ib(device))
>>>> +    if (!has_mcast(device))
>>>>          return;
>>>>  
>>>>      dev = kmalloc(sizeof *dev + device->phys_port_cnt * sizeof *port,
>>>> @@ -823,7 +823,7 @@ static void mcast_add_one(struct ib_device *device)
>>>>      }
>>>>  
>>>>      for (i = 0; i <= dev->end_port - dev->start_port; i++) {
>>>> -        if (!rdma_port_ll_is_ib(device, dev->start_port + i))
>>>> +        if (!cap_mcast(device, dev->start_port + i))
>>>>              continue;
>>>>          port = &dev->port[i];
>>>>          port->dev = dev;
>>>> @@ -861,7 +861,7 @@ static void mcast_remove_one(struct ib_device *device)
>>>>      flush_workqueue(mcast_wq);
>>>>  
>>>>      for (i = 0; i <= dev->end_port - dev->start_port; i++) {
>>>> -        if (rdma_port_ll_is_ib(device, dev->start_port + i)) {
>>>> +        if (cap_mcast(device, dev->start_port + i)) {
>>>>              port = &dev->port[i];
>>>>              deref_port(port);
>>>>              wait_for_completion(&port->comp);
>>>> diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
>>>> index fa8ffa3..e796104 100644
>>>> --- a/include/rdma/ib_verbs.h
>>>> +++ b/include/rdma/ib_verbs.h
>>>> @@ -1823,6 +1823,19 @@ static inline int has_sa(struct ib_device *device)
>>>>  }
>>>>  
>>>>  /**
>>>> + * has_mcast - Check if a device support Multicast.
>>>> + *
>>>> + * @device: Device to be checked
>>>> + *
>>>> + * Return 0 when a device has none port to support
>>>> + * Multicast.
>>>> + */
>>>> +static inline int has_mcast(struct ib_device *device)
>>>> +{
>>>> +    return rdma_transport_is_ib(device);
>>>> +}
>>>> +
>>>> +/**
>>>>   * cap_smi - Check if the port of device has the capability
>>>>   * Subnet Management Interface.
>>>>   *
>>>> @@ -1852,6 +1865,21 @@ static inline int cap_sa(struct ib_device *device, u8 port_num)
>>>>      return rdma_port_ll_is_ib(device, port_num);
>>>>  }
>>>>  
>>>> +/**
>>>> + * cap_mcast - Check if the port of device has the capability
>>>> + * Multicast.
>>>> + *
>>>> + * @device: Device to be checked
>>>> + * @port_num: Port number of the device
>>>> + *
>>>> + * Return 0 when port of the device don't support
>>>> + * Multicast.
>>>> + */
>>>> +static inline int cap_mcast(struct ib_device *device, u8 port_num)
>>>> +{
>>>> +    return rdma_port_ll_is_ib(device, port_num);
>>>> +}
>>>> +
>>>>  int ib_query_gid(struct ib_device *device,
>>>>           u8 port_num, int index, union ib_gid *gid);
>>>>  
>> --
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