netdev - Re: [PATCH v7 16/28] sfc: obtain root decoder with enough HPA free space

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Message-ID: <5cf7fb31-5e84-5baa-5f43-37ba01eed957@amd.com>
Date: Tue, 10 Dec 2024 12:34:22 +0000
From: Alejandro Lucero Palau <alucerop@....com>
To: Edward Cree <ecree.xilinx@...il.com>, alejandro.lucero-palau@....com,
 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, dave.jiang@...el.com
Subject: Re: [PATCH v7 16/28] sfc: obtain root decoder with enough HPA free
 space


On 12/10/24 09:51, Edward Cree wrote:
> On 09/12/2024 18:54, alejandro.lucero-palau@....com wrote:
>> From: Alejandro Lucero <alucerop@....com>
>>
>> Asking for available HPA space is the previous step to try to obtain
>> an HPA range suitable to accel driver purposes.
>>
>> Add this call to efx cxl initialization.
>>
>> Signed-off-by: Alejandro Lucero <alucerop@....com>
>> Reviewed-by: Martin Habets <habetsm.xilinx@...il.com>
>> ---
>>   drivers/net/ethernet/sfc/efx_cxl.c | 18 ++++++++++++++++++
>>   1 file changed, 18 insertions(+)
>>
>> diff --git a/drivers/net/ethernet/sfc/efx_cxl.c b/drivers/net/ethernet/sfc/efx_cxl.c
>> index 8db5cf5d9ab0..f2dc025c9fbb 100644
>> --- a/drivers/net/ethernet/sfc/efx_cxl.c
>> +++ b/drivers/net/ethernet/sfc/efx_cxl.c
>> @@ -26,6 +26,7 @@ int efx_cxl_init(struct efx_probe_data *probe_data)
>>   	struct pci_dev *pci_dev;
>>   	struct efx_cxl *cxl;
>>   	struct resource res;
>> +	resource_size_t max;
> While it won't actually match because there's no (), the fact that this
>   is the name of a common function-like macro is not ideal.  Can you
>   rename this variable to something clearer ('max_size' perhaps)?


It makes sense. I'll do it.


>
>>   	u16 dvsec;
>>   	int rc;
>>   
>> @@ -102,6 +103,23 @@ int efx_cxl_init(struct efx_probe_data *probe_data)
>>   		goto err3;
>>   	}
>>   
>> +	cxl->cxlrd = cxl_get_hpa_freespace(cxl->cxlmd,
>> +					   CXL_DECODER_F_RAM | CXL_DECODER_F_TYPE2,
>> +					   &max);
>> +
>> +	if (IS_ERR(cxl->cxlrd)) {
>> +		pci_err(pci_dev, "cxl_get_hpa_freespace failed\n");
>> +		rc = PTR_ERR(cxl->cxlrd);
>> +		goto err3;
>> +	}
>> +
>> +	if (max < EFX_CTPIO_BUFFER_SIZE) {
>> +		pci_err(pci_dev, "%s: no enough free HPA space %pap < %u\n",
> s/no/not/


Right. I'll fix it.

Thanks


>> +			__func__, &max, EFX_CTPIO_BUFFER_SIZE);
>> +		rc = -ENOSPC;
>> +		goto err3;
>> +	}
>> +
>>   	probe_data->cxl = cxl;
>>   
>>   	return 0;
>>