linux-kernel - Re: [PATCH v4 04/27] IB/Verbs: Reform IB-core cm

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Message-ID: <552FAE87.50303@dev.mellanox.co.il>
Date:	Thu, 16 Apr 2015 08:43:51 -0400
From:	Hal Rosenstock <hal@....mellanox.co.il>
To:	Michael Wang <yun.wang@...fitbricks.com>
CC:	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,
	Tom Tucker <tom@...ngridcomputing.com>,
	Steve Wise <swise@...ngridcomputing.com>,
	Hoang-Nam Nguyen <hnguyen@...ibm.com>,
	Christoph Raisch <raisch@...ibm.com>,
	Mike Marciniszyn <infinipath@...el.com>,
	Eli Cohen <eli@...lanox.com>,
	Faisal Latif <faisal.latif@...el.com>,
	Jack Morgenstein <jackm@....mellanox.co.il>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Haggai Eran <haggaie@...lanox.com>,
	Ira Weiny <ira.weiny@...el.com>, Tom Talpey <tom@...pey.com>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Doug Ledford <dledford@...hat.com>
Subject: Re: [PATCH v4 04/27] IB/Verbs: Reform IB-core cm

On 4/16/2015 4:05 AM, Michael Wang wrote:
> 
> Use raw management helpers to reform IB-core cm.
> 
> Cc: Steve Wise <swise@...ngridcomputing.com>
> Cc: Tom Talpey <tom@...pey.com>
> 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/cm.c | 22 +++++++++++++++++++---
>  1 file changed, 19 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/infiniband/core/cm.c b/drivers/infiniband/core/cm.c
> index e28a494..50321fe 100644
> --- a/drivers/infiniband/core/cm.c
> +++ b/drivers/infiniband/core/cm.c
> @@ -3761,9 +3761,7 @@ static void cm_add_one(struct ib_device *ib_device)
>  	unsigned long flags;
>  	int ret;
>  	u8 i;
> -
> -	if (rdma_node_get_transport(ib_device->node_type) != RDMA_TRANSPORT_IB)
> -		return;
> +	int count = 0;
>  
>  	cm_dev = kzalloc(sizeof(*cm_dev) + sizeof(*port) *
>  			 ib_device->phys_port_cnt, GFP_KERNEL);
> @@ -3783,6 +3781,9 @@ static void cm_add_one(struct ib_device *ib_device)
>  
>  	set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
>  	for (i = 1; i <= ib_device->phys_port_cnt; i++) {
> +		if (!rdma_ib_or_iboe(ib_device, i))
> +			continue;
> +
>  		port = kzalloc(sizeof *port, GFP_KERNEL);
>  		if (!port)
>  			goto error1;
> @@ -3809,7 +3810,16 @@ static void cm_add_one(struct ib_device *ib_device)
>  		ret = ib_modify_port(ib_device, i, 0, &port_modify);
>  		if (ret)
>  			goto error3;
> +
> +		count++;
>  	}
> +
> +	if (!count) {
> +		device_unregister(cm_dev->device);
> +		kfree(cm_dev);
> +		return;

Nit: alternatively, this could be goto at end of this routine where
there is same 2 calls. I think Jason made this comment on earlier set of
these patches.

-- Hal

> +	}
> +
>  	ib_set_client_data(ib_device, &cm_client, cm_dev);
>  
>  	write_lock_irqsave(&cm.device_lock, flags);
> @@ -3825,6 +3835,9 @@ error1:
>  	port_modify.set_port_cap_mask = 0;
>  	port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
>  	while (--i) {
> +		if (!rdma_ib_or_iboe(ib_device, i))
> +			continue;
> +
>  		port = cm_dev->port[i-1];
>  		ib_modify_port(ib_device, port->port_num, 0, &port_modify);
>  		ib_unregister_mad_agent(port->mad_agent);
> @@ -3853,6 +3866,9 @@ static void cm_remove_one(struct ib_device *ib_device)
>  	write_unlock_irqrestore(&cm.device_lock, flags);
>  
>  	for (i = 1; i <= ib_device->phys_port_cnt; i++) {
> +		if (!rdma_ib_or_iboe(ib_device, i))
> +			continue;
> +
>  		port = cm_dev->port[i-1];
>  		ib_modify_port(ib_device, port->port_num, 0, &port_modify);
>  		ib_unregister_mad_agent(port->mad_agent);

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