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Date:   Thu, 26 Oct 2023 11:47:34 +0200
User-Agent: Mozilla Thunderbird
Subject: Re: [PATCH iwl-next] iavf: Remove queue tracking fields from
 iavf_adminq_ring
Content-Language: en-US
To:     Ivan Vecera <ivecera@redhat.com>, <netdev@vger.kernel.org>
CC:     Jesse Brandeburg <jesse.brandeburg@intel.com>,
        Tony Nguyen <anthony.l.nguyen@intel.com>,
        "David S. Miller" <davem@davemloft.net>,
        "Eric Dumazet" <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>,
        <intel-wired-lan@lists.osuosl.org>, <linux-kernel@vger.kernel.org>,
        Jacob Keller <jacob.e.keller@intel.com>
References: <20231026083932.2623631-1-ivecera@redhat.com>
From:   Wojciech Drewek <wojciech.drewek@intel.com>
In-Reply-To: <20231026083932.2623631-1-ivecera@redhat.com>
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On 26.10.2023 10:39, Ivan Vecera wrote:
> Fields 'head', 'tail', 'len', 'bah' and 'bal' in iavf_adminq_ring
> are used to store register offsets. These offsets are initialized
> and remains constant so there is no need to store them in the
> iavf_adminq_ring structure.
> 
> Remove these fields from iavf_adminq_ring and use register offset
> constants instead. Remove iavf_adminq_init_regs() that originally
> stores these constants into these fields.
> 
> Finally improve iavf_check_asq_alive() that assumes that
> non-zero value of hw->aq.asq.len indicates fully initialized
> AdminQ send queue. Replace it by check for non-zero value
> of field hw->aq.asq.count that is non-zero when the sending
> queue is initialized and is zeroed during shutdown of
> the queue.
> 
> Signed-off-by: Ivan Vecera <ivecera@redhat.com>
> ---

Reviewed-by: Wojciech Drewek <wojciech.drewek@intel.com>

>  drivers/net/ethernet/intel/iavf/iavf_adminq.c | 86 +++++++------------
>  drivers/net/ethernet/intel/iavf/iavf_adminq.h |  7 --
>  drivers/net/ethernet/intel/iavf/iavf_common.c |  8 +-
>  drivers/net/ethernet/intel/iavf/iavf_main.c   |  8 +-
>  4 files changed, 39 insertions(+), 70 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/iavf/iavf_adminq.c b/drivers/net/ethernet/intel/iavf/iavf_adminq.c
> index 9ffbd24d83cb..82fcd18ad660 100644
> --- a/drivers/net/ethernet/intel/iavf/iavf_adminq.c
> +++ b/drivers/net/ethernet/intel/iavf/iavf_adminq.c
> @@ -7,27 +7,6 @@
>  #include "iavf_adminq.h"
>  #include "iavf_prototype.h"
>  
> -/**
> - *  iavf_adminq_init_regs - Initialize AdminQ registers
> - *  @hw: pointer to the hardware structure
> - *
> - *  This assumes the alloc_asq and alloc_arq functions have already been called
> - **/
> -static void iavf_adminq_init_regs(struct iavf_hw *hw)
> -{
> -	/* set head and tail registers in our local struct */
> -	hw->aq.asq.tail = IAVF_VF_ATQT1;
> -	hw->aq.asq.head = IAVF_VF_ATQH1;
> -	hw->aq.asq.len  = IAVF_VF_ATQLEN1;
> -	hw->aq.asq.bal  = IAVF_VF_ATQBAL1;
> -	hw->aq.asq.bah  = IAVF_VF_ATQBAH1;
> -	hw->aq.arq.tail = IAVF_VF_ARQT1;
> -	hw->aq.arq.head = IAVF_VF_ARQH1;
> -	hw->aq.arq.len  = IAVF_VF_ARQLEN1;
> -	hw->aq.arq.bal  = IAVF_VF_ARQBAL1;
> -	hw->aq.arq.bah  = IAVF_VF_ARQBAH1;
> -}
> -
>  /**
>   *  iavf_alloc_adminq_asq_ring - Allocate Admin Queue send rings
>   *  @hw: pointer to the hardware structure
> @@ -259,17 +238,17 @@ static enum iavf_status iavf_config_asq_regs(struct iavf_hw *hw)
>  	u32 reg = 0;
>  
>  	/* Clear Head and Tail */
> -	wr32(hw, hw->aq.asq.head, 0);
> -	wr32(hw, hw->aq.asq.tail, 0);
> +	wr32(hw, IAVF_VF_ATQH1, 0);
> +	wr32(hw, IAVF_VF_ATQT1, 0);
>  
>  	/* set starting point */
> -	wr32(hw, hw->aq.asq.len, (hw->aq.num_asq_entries |
> +	wr32(hw, IAVF_VF_ATQLEN1, (hw->aq.num_asq_entries |
>  				  IAVF_VF_ATQLEN1_ATQENABLE_MASK));
> -	wr32(hw, hw->aq.asq.bal, lower_32_bits(hw->aq.asq.desc_buf.pa));
> -	wr32(hw, hw->aq.asq.bah, upper_32_bits(hw->aq.asq.desc_buf.pa));
> +	wr32(hw, IAVF_VF_ATQBAL1, lower_32_bits(hw->aq.asq.desc_buf.pa));
> +	wr32(hw, IAVF_VF_ATQBAH1, upper_32_bits(hw->aq.asq.desc_buf.pa));
>  
>  	/* Check one register to verify that config was applied */
> -	reg = rd32(hw, hw->aq.asq.bal);
> +	reg = rd32(hw, IAVF_VF_ATQBAL1);
>  	if (reg != lower_32_bits(hw->aq.asq.desc_buf.pa))
>  		ret_code = IAVF_ERR_ADMIN_QUEUE_ERROR;
>  
> @@ -288,20 +267,20 @@ static enum iavf_status iavf_config_arq_regs(struct iavf_hw *hw)
>  	u32 reg = 0;
>  
>  	/* Clear Head and Tail */
> -	wr32(hw, hw->aq.arq.head, 0);
> -	wr32(hw, hw->aq.arq.tail, 0);
> +	wr32(hw, IAVF_VF_ARQH1, 0);
> +	wr32(hw, IAVF_VF_ARQT1, 0);
>  
>  	/* set starting point */
> -	wr32(hw, hw->aq.arq.len, (hw->aq.num_arq_entries |
> +	wr32(hw, IAVF_VF_ARQLEN1, (hw->aq.num_arq_entries |
>  				  IAVF_VF_ARQLEN1_ARQENABLE_MASK));
> -	wr32(hw, hw->aq.arq.bal, lower_32_bits(hw->aq.arq.desc_buf.pa));
> -	wr32(hw, hw->aq.arq.bah, upper_32_bits(hw->aq.arq.desc_buf.pa));
> +	wr32(hw, IAVF_VF_ARQBAL1, lower_32_bits(hw->aq.arq.desc_buf.pa));
> +	wr32(hw, IAVF_VF_ARQBAH1, upper_32_bits(hw->aq.arq.desc_buf.pa));
>  
>  	/* Update tail in the HW to post pre-allocated buffers */
> -	wr32(hw, hw->aq.arq.tail, hw->aq.num_arq_entries - 1);
> +	wr32(hw, IAVF_VF_ARQT1, hw->aq.num_arq_entries - 1);
>  
>  	/* Check one register to verify that config was applied */
> -	reg = rd32(hw, hw->aq.arq.bal);
> +	reg = rd32(hw, IAVF_VF_ARQBAL1);
>  	if (reg != lower_32_bits(hw->aq.arq.desc_buf.pa))
>  		ret_code = IAVF_ERR_ADMIN_QUEUE_ERROR;
>  
> @@ -455,11 +434,11 @@ static enum iavf_status iavf_shutdown_asq(struct iavf_hw *hw)
>  	}
>  
>  	/* Stop firmware AdminQ processing */
> -	wr32(hw, hw->aq.asq.head, 0);
> -	wr32(hw, hw->aq.asq.tail, 0);
> -	wr32(hw, hw->aq.asq.len, 0);
> -	wr32(hw, hw->aq.asq.bal, 0);
> -	wr32(hw, hw->aq.asq.bah, 0);
> +	wr32(hw, IAVF_VF_ATQH1, 0);
> +	wr32(hw, IAVF_VF_ATQT1, 0);
> +	wr32(hw, IAVF_VF_ATQLEN1, 0);
> +	wr32(hw, IAVF_VF_ATQBAL1, 0);
> +	wr32(hw, IAVF_VF_ATQBAH1, 0);
>  
>  	hw->aq.asq.count = 0; /* to indicate uninitialized queue */
>  
> @@ -489,11 +468,11 @@ static enum iavf_status iavf_shutdown_arq(struct iavf_hw *hw)
>  	}
>  
>  	/* Stop firmware AdminQ processing */
> -	wr32(hw, hw->aq.arq.head, 0);
> -	wr32(hw, hw->aq.arq.tail, 0);
> -	wr32(hw, hw->aq.arq.len, 0);
> -	wr32(hw, hw->aq.arq.bal, 0);
> -	wr32(hw, hw->aq.arq.bah, 0);
> +	wr32(hw, IAVF_VF_ARQH1, 0);
> +	wr32(hw, IAVF_VF_ARQT1, 0);
> +	wr32(hw, IAVF_VF_ARQLEN1, 0);
> +	wr32(hw, IAVF_VF_ARQBAL1, 0);
> +	wr32(hw, IAVF_VF_ARQBAH1, 0);
>  
>  	hw->aq.arq.count = 0; /* to indicate uninitialized queue */
>  
> @@ -529,9 +508,6 @@ enum iavf_status iavf_init_adminq(struct iavf_hw *hw)
>  		goto init_adminq_exit;
>  	}
>  
> -	/* Set up register offsets */
> -	iavf_adminq_init_regs(hw);
> -
>  	/* setup ASQ command write back timeout */
>  	hw->aq.asq_cmd_timeout = IAVF_ASQ_CMD_TIMEOUT;
>  
> @@ -587,9 +563,9 @@ static u16 iavf_clean_asq(struct iavf_hw *hw)
>  
>  	desc = IAVF_ADMINQ_DESC(*asq, ntc);
>  	details = IAVF_ADMINQ_DETAILS(*asq, ntc);
> -	while (rd32(hw, hw->aq.asq.head) != ntc) {
> +	while (rd32(hw, IAVF_VF_ATQH1) != ntc) {
>  		iavf_debug(hw, IAVF_DEBUG_AQ_MESSAGE,
> -			   "ntc %d head %d.\n", ntc, rd32(hw, hw->aq.asq.head));
> +			   "ntc %d head %d.\n", ntc, rd32(hw, IAVF_VF_ATQH1));
>  
>  		if (details->callback) {
>  			IAVF_ADMINQ_CALLBACK cb_func =
> @@ -624,7 +600,7 @@ bool iavf_asq_done(struct iavf_hw *hw)
>  	/* AQ designers suggest use of head for better
>  	 * timing reliability than DD bit
>  	 */
> -	return rd32(hw, hw->aq.asq.head) == hw->aq.asq.next_to_use;
> +	return rd32(hw, IAVF_VF_ATQH1) == hw->aq.asq.next_to_use;
>  }
>  
>  /**
> @@ -663,7 +639,7 @@ enum iavf_status iavf_asq_send_command(struct iavf_hw *hw,
>  
>  	hw->aq.asq_last_status = IAVF_AQ_RC_OK;
>  
> -	val = rd32(hw, hw->aq.asq.head);
> +	val = rd32(hw, IAVF_VF_ATQH1);
>  	if (val >= hw->aq.num_asq_entries) {
>  		iavf_debug(hw, IAVF_DEBUG_AQ_MESSAGE,
>  			   "AQTX: head overrun at %d\n", val);
> @@ -755,7 +731,7 @@ enum iavf_status iavf_asq_send_command(struct iavf_hw *hw,
>  	if (hw->aq.asq.next_to_use == hw->aq.asq.count)
>  		hw->aq.asq.next_to_use = 0;
>  	if (!details->postpone)
> -		wr32(hw, hw->aq.asq.tail, hw->aq.asq.next_to_use);
> +		wr32(hw, IAVF_VF_ATQT1, hw->aq.asq.next_to_use);
>  
>  	/* if cmd_details are not defined or async flag is not set,
>  	 * we need to wait for desc write back
> @@ -810,7 +786,7 @@ enum iavf_status iavf_asq_send_command(struct iavf_hw *hw,
>  	/* update the error if time out occurred */
>  	if ((!cmd_completed) &&
>  	    (!details->async && !details->postpone)) {
> -		if (rd32(hw, hw->aq.asq.len) & IAVF_VF_ATQLEN1_ATQCRIT_MASK) {
> +		if (rd32(hw, IAVF_VF_ATQLEN1) & IAVF_VF_ATQLEN1_ATQCRIT_MASK) {
>  			iavf_debug(hw, IAVF_DEBUG_AQ_MESSAGE,
>  				   "AQTX: AQ Critical error.\n");
>  			status = IAVF_ERR_ADMIN_QUEUE_CRITICAL_ERROR;
> @@ -878,7 +854,7 @@ enum iavf_status iavf_clean_arq_element(struct iavf_hw *hw,
>  	}
>  
>  	/* set next_to_use to head */
> -	ntu = rd32(hw, hw->aq.arq.head) & IAVF_VF_ARQH1_ARQH_MASK;
> +	ntu = rd32(hw, IAVF_VF_ARQH1) & IAVF_VF_ARQH1_ARQH_MASK;
>  	if (ntu == ntc) {
>  		/* nothing to do - shouldn't need to update ring's values */
>  		ret_code = IAVF_ERR_ADMIN_QUEUE_NO_WORK;
> @@ -926,7 +902,7 @@ enum iavf_status iavf_clean_arq_element(struct iavf_hw *hw,
>  	desc->params.external.addr_low = cpu_to_le32(lower_32_bits(bi->pa));
>  
>  	/* set tail = the last cleaned desc index. */
> -	wr32(hw, hw->aq.arq.tail, ntc);
> +	wr32(hw, IAVF_VF_ARQT1, ntc);
>  	/* ntc is updated to tail + 1 */
>  	ntc++;
>  	if (ntc == hw->aq.num_arq_entries)
> diff --git a/drivers/net/ethernet/intel/iavf/iavf_adminq.h b/drivers/net/ethernet/intel/iavf/iavf_adminq.h
> index 1f60518eb0e5..406506f64bdd 100644
> --- a/drivers/net/ethernet/intel/iavf/iavf_adminq.h
> +++ b/drivers/net/ethernet/intel/iavf/iavf_adminq.h
> @@ -29,13 +29,6 @@ struct iavf_adminq_ring {
>  	/* used for interrupt processing */
>  	u16 next_to_use;
>  	u16 next_to_clean;
> -
> -	/* used for queue tracking */
> -	u32 head;
> -	u32 tail;
> -	u32 len;
> -	u32 bah;
> -	u32 bal;
>  };
>  
>  /* ASQ transaction details */
> diff --git a/drivers/net/ethernet/intel/iavf/iavf_common.c b/drivers/net/ethernet/intel/iavf/iavf_common.c
> index 8091e6feca01..89d2bce529ae 100644
> --- a/drivers/net/ethernet/intel/iavf/iavf_common.c
> +++ b/drivers/net/ethernet/intel/iavf/iavf_common.c
> @@ -279,11 +279,11 @@ void iavf_debug_aq(struct iavf_hw *hw, enum iavf_debug_mask mask, void *desc,
>   **/
>  bool iavf_check_asq_alive(struct iavf_hw *hw)
>  {
> -	if (hw->aq.asq.len)
> -		return !!(rd32(hw, hw->aq.asq.len) &
> -			  IAVF_VF_ATQLEN1_ATQENABLE_MASK);
> -	else
> +	/* Check if the queue is initialized */
> +	if (!hw->aq.asq.count)
>  		return false;
> +
> +	return !!(rd32(hw, IAVF_VF_ATQLEN1) & IAVF_VF_ATQLEN1_ATQENABLE_MASK);
>  }
>  
>  /**
> diff --git a/drivers/net/ethernet/intel/iavf/iavf_main.c b/drivers/net/ethernet/intel/iavf/iavf_main.c
> index 6e27b7938b8a..146755498feb 100644
> --- a/drivers/net/ethernet/intel/iavf/iavf_main.c
> +++ b/drivers/net/ethernet/intel/iavf/iavf_main.c
> @@ -3253,7 +3253,7 @@ static void iavf_adminq_task(struct work_struct *work)
>  		goto freedom;
>  
>  	/* check for error indications */
> -	val = rd32(hw, hw->aq.arq.len);
> +	val = rd32(hw, IAVF_VF_ARQLEN1);
>  	if (val == 0xdeadbeef || val == 0xffffffff) /* device in reset */
>  		goto freedom;
>  	oldval = val;
> @@ -3270,9 +3270,9 @@ static void iavf_adminq_task(struct work_struct *work)
>  		val &= ~IAVF_VF_ARQLEN1_ARQCRIT_MASK;
>  	}
>  	if (oldval != val)
> -		wr32(hw, hw->aq.arq.len, val);
> +		wr32(hw, IAVF_VF_ARQLEN1, val);
>  
> -	val = rd32(hw, hw->aq.asq.len);
> +	val = rd32(hw, IAVF_VF_ATQLEN1);
>  	oldval = val;
>  	if (val & IAVF_VF_ATQLEN1_ATQVFE_MASK) {
>  		dev_info(&adapter->pdev->dev, "ASQ VF Error detected\n");
> @@ -3287,7 +3287,7 @@ static void iavf_adminq_task(struct work_struct *work)
>  		val &= ~IAVF_VF_ATQLEN1_ATQCRIT_MASK;
>  	}
>  	if (oldval != val)
> -		wr32(hw, hw->aq.asq.len, val);
> +		wr32(hw, IAVF_VF_ATQLEN1, val);
>  
>  freedom:
>  	kfree(event.msg_buf);