netdev - Re: [PATCH v6 16/28] sfc: obtain root decoder with enough HPA free space

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Message-ID: <bb5320a7-8cc0-fc62-1796-543a400ae3aa@amd.com>
Date: Mon, 9 Dec 2024 09:24:31 +0000
From: Alejandro Lucero Palau <alucerop@....com>
To: Fan Ni <nifan.cxl@...il.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, dave.jiang@...el.com
Subject: Re: [PATCH v6 16/28] sfc: obtain root decoder with enough HPA free
 space


On 12/6/24 21:36, Fan Ni wrote:
> On Mon, Dec 02, 2024 at 05:12:10PM +0000, alejandro.lucero-palau@....com wrote:
>> From: Alejandro Lucero <alucerop@....com>
>>
>> Asking for availbale HPA space is the previous step to try to obtain
> /availbale/available/
>
> Fan


Good catch.

I'll fix it.

Thanks!


>> an HPA range suitable to accel driver purposes.
>>
>> Add this call to efx cxl initialization.
>>
>> Signed-off-by: Alejandro Lucero <alucerop@....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 d03fa9f9c421..79b93d92f9c2 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;
>>   	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 %llu < %u\n",
>> +			__func__, max, EFX_CTPIO_BUFFER_SIZE);
>> +		rc = -ENOSPC;
>> +		goto err3;
>> +	}
>> +
>>   	probe_data->cxl = cxl;
>>   
>>   	return 0;
>> -- 
>> 2.17.1
>>