linux-kernel - Re: [PATCH net-next v3 5/6] net: xilinx: axienet: Get coalesce parameters from driver state

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Message-ID: <14d13d7e-ef1d-4dcc-bd18-7a6709616678@linux.dev>
Date: Mon, 13 Jan 2025 12:45:24 -0500
From: Sean Anderson <sean.anderson@...ux.dev>
To: Simon Horman <horms@...nel.org>
Cc: "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>,
 Radhey Shyam Pandey <radhey.shyam.pandey@....com>, netdev@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, Shannon Nelson
 <shannon.nelson@....com>, Michal Simek <michal.simek@....com>,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v3 5/6] net: xilinx: axienet: Get coalesce
 parameters from driver state

Hi Simon,

On 1/13/25 12:39, Simon Horman wrote:
> On Fri, Jan 10, 2025 at 02:26:15PM -0500, Sean Anderson wrote:
>> The cr variables now contain the same values as the control registers
>> themselves. Extract/calculate the values from the variables instead of
>> saving the user-specified values. This allows us to remove some
>> bookeeping, and also lets the user know what the actual coalesce
>> settings are.
>> 
>> Signed-off-by: Sean Anderson <sean.anderson@...ux.dev>
>> Reviewed by: Shannon Nelson <shannon.nelson@....com>
> 
> Hi Sean,
> 
> Unfortunately this series does not appear to apply cleanly to net-next.
> Which is our CI is currently unable to cope with :(
> 
> Please consider rebasing and reposting.

As noted in the cover letter, this series depends on [1] (now [2]). It
will apply cleanly without rebasing once that patch is applied. So maybe
you can re-run the CI at that time.

--Sean

[1] https://lore.kernel.org/netdev/20250110190726.2057790-1-sean.anderson@linux.dev/
[2] https://lore.kernel.org/netdev/20250113163001.2335235-1-sean.anderson@linux.dev

>> ---
>> 
>> (no changes since v2)
>> 
>> Changes in v2:
>> - New
>> 
>>  drivers/net/ethernet/xilinx/xilinx_axienet.h  |  8 ---
>>  .../net/ethernet/xilinx/xilinx_axienet_main.c | 70 +++++++++++++------
>>  2 files changed, 47 insertions(+), 31 deletions(-)
>> 
>> diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet.h b/drivers/net/ethernet/xilinx/xilinx_axienet.h
>> index 6b8e550c2155..45d8d80dbb1a 100644
>> --- a/drivers/net/ethernet/xilinx/xilinx_axienet.h
>> +++ b/drivers/net/ethernet/xilinx/xilinx_axienet.h
>> @@ -533,10 +533,6 @@ struct skbuf_dma_descriptor {
>>   *		  supported, the maximum frame size would be 9k. Else it is
>>   *		  1522 bytes (assuming support for basic VLAN)
>>   * @rxmem:	Stores rx memory size for jumbo frame handling.
>> - * @coalesce_count_rx:	Store the irq coalesce on RX side.
>> - * @coalesce_usec_rx:	IRQ coalesce delay for RX
>> - * @coalesce_count_tx:	Store the irq coalesce on TX side.
>> - * @coalesce_usec_tx:	IRQ coalesce delay for TX
>>   * @use_dmaengine: flag to check dmaengine framework usage.
>>   * @tx_chan:	TX DMA channel.
>>   * @rx_chan:	RX DMA channel.
>> @@ -615,10 +611,6 @@ struct axienet_local {
>>  	u32 max_frm_size;
>>  	u32 rxmem;
>>  
>> -	u32 coalesce_count_rx;
>> -	u32 coalesce_usec_rx;
>> -	u32 coalesce_count_tx;
>> -	u32 coalesce_usec_tx;
>>  	u8  use_dmaengine;
>>  	struct dma_chan *tx_chan;
>>  	struct dma_chan *rx_chan;
> 
>> diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
> 
> ...
> 
>> @@ -260,6 +264,23 @@ static u32 axienet_calc_cr(struct axienet_local *lp, u32 count, u32 usec)
>>  	return cr;
>>  }
>>  
>> +/**
>> + * axienet_cr_params() - Extract coalesce parameters from the CR
> 
> nit: axienet_coalesce_params
> 
>> + * @lp: Device private data
>> + * @cr: The control register to parse
>> + * @count: Number of packets before an interrupt
>> + * @usec: Idle time (in usec) before an interrupt
>> + */
>> +static void axienet_coalesce_params(struct axienet_local *lp, u32 cr,
>> +				    u32 *count, u32 *usec)
>> +{
>> +	u64 clk_rate = axienet_dma_rate(lp);
>> +	u64 timer = FIELD_GET(XAXIDMA_DELAY_MASK, cr);
>> +
>> +	*count = FIELD_GET(XAXIDMA_COALESCE_MASK, cr);
>> +	*usec = DIV64_U64_ROUND_CLOSEST(timer * XAXIDMA_DELAY_SCALE, clk_rate);
>> +}
>> +
>>  /**
>>   * axienet_dma_start - Set up DMA registers and start DMA operation
>>   * @lp:		Pointer to the axienet_local structure