netdev - Re: [PATCH v5 18/27] sfc: get endpoint decoder

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Message-ID: <8c3a262e-3e73-6391-8bfb-589600832024@amd.com>
Date: Wed, 27 Nov 2024 16:47:37 +0000
From: Alejandro Lucero Palau <alucerop@....com>
To: Ben Cheatham <benjamin.cheatham@....com>, alejandro.lucero-palau@....com
Cc: linux-cxl@...r.kernel.org, netdev@...r.kernel.org,
 dan.j.williams@...el.com, martin.habets@...inx.com, edward.cree@....com,
 davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com, edumazet@...gle.com
Subject: Re: [PATCH v5 18/27] sfc: get endpoint decoder


On 11/22/24 20:45, Ben Cheatham wrote:
> On 11/18/24 10:44 AM, alejandro.lucero-palau@....com wrote:
>> From: Alejandro Lucero <alucerop@....com>
>>
>> Use cxl api for getting DPA (Device Physical Address) to use through an
>> endpoint decoder.
>>
>> Signed-off-by: Alejandro Lucero <alucerop@....com>
>> ---
>>   drivers/net/ethernet/sfc/efx_cxl.c | 9 +++++++++
>>   1 file changed, 9 insertions(+)
>>
>> diff --git a/drivers/net/ethernet/sfc/efx_cxl.c b/drivers/net/ethernet/sfc/efx_cxl.c
>> index 048500492371..85d9632f497a 100644
>> --- a/drivers/net/ethernet/sfc/efx_cxl.c
>> +++ b/drivers/net/ethernet/sfc/efx_cxl.c
>> @@ -120,6 +120,14 @@ int efx_cxl_init(struct efx_probe_data *probe_data)
>>   		goto err3;
>>   	}
>>   
>> +	cxl->cxled = cxl_request_dpa(cxl->cxlmd, true, EFX_CTPIO_BUFFER_SIZE,
>> +				     EFX_CTPIO_BUFFER_SIZE);
>> +	if (!cxl->cxled || IS_ERR(cxl->cxled)) {
> I'm 99% sure you can replace this with IS_ERR_OR_NULL(cxl->cxled).


Right. I'll change it.

Thanks!


>
>> +		pci_err(pci_dev, "CXL accel request DPA failed");
>> +		rc = PTR_ERR(cxl->cxlrd);
>> +		goto err3;
>> +	}
>> +
>>   	probe_data->cxl = cxl;
>>   
>>   	return 0;
>> @@ -137,6 +145,7 @@ int efx_cxl_init(struct efx_probe_data *probe_data)
>>   void efx_cxl_exit(struct efx_probe_data *probe_data)
>>   {
>>   	if (probe_data->cxl) {
>> +		cxl_dpa_free(probe_data->cxl->cxled);
>>   		cxl_release_resource(probe_data->cxl->cxlds, CXL_RES_RAM);
>>   		kfree(probe_data->cxl->cxlds);
>>   		kfree(probe_data->cxl);