netdev - Re: [PATCH net-next 1/9] ibmvnic: Consolidate code in replenish_rx

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Date:   Tue, 31 Aug 2021 18:26:54 -0700
From:   Dany Madden <drt@...ux.ibm.com>
To:     Sukadev Bhattiprolu <sukadev@...ux.ibm.com>
Cc:     netdev@...r.kernel.org, Brian King <brking@...ux.ibm.com>,
        cforno12@...ux.ibm.com, Rick Lindsley <ricklind@...ux.ibm.com>
Subject: Re: [PATCH net-next 1/9] ibmvnic: Consolidate code in
 replenish_rx_pool()

On 2021-08-31 17:08, Sukadev Bhattiprolu wrote:
> For better readability, consolidate related code in replenish_rx_pool()
> and add some comments.
> 
> Signed-off-by: Sukadev Bhattiprolu <sukadev@...ux.ibm.com>
Reviewed-by: Dany Madden <drt@...ux.ibm.com>

> ---
>  drivers/net/ethernet/ibm/ibmvnic.c | 10 +++++++---
>  1 file changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/ethernet/ibm/ibmvnic.c
> b/drivers/net/ethernet/ibm/ibmvnic.c
> index a775c69e4fd7..e8b1231be485 100644
> --- a/drivers/net/ethernet/ibm/ibmvnic.c
> +++ b/drivers/net/ethernet/ibm/ibmvnic.c
> @@ -371,6 +371,8 @@ static void replenish_rx_pool(struct
> ibmvnic_adapter *adapter,
>  		}
> 
>  		index = pool->free_map[pool->next_free];
> +		pool->free_map[pool->next_free] = IBMVNIC_INVALID_MAP;
> +		pool->next_free = (pool->next_free + 1) % pool->size;
> 
>  		if (pool->rx_buff[index].skb)
>  			dev_err(dev, "Inconsistent free_map!\n");
> @@ -380,14 +382,15 @@ static void replenish_rx_pool(struct
> ibmvnic_adapter *adapter,
>  		dst = pool->long_term_buff.buff + offset;
>  		memset(dst, 0, pool->buff_size);
>  		dma_addr = pool->long_term_buff.addr + offset;
> -		pool->rx_buff[index].data = dst;
> 
> -		pool->free_map[pool->next_free] = IBMVNIC_INVALID_MAP;
> +		/* add the skb to an rx_buff in the pool */
> +		pool->rx_buff[index].data = dst;
>  		pool->rx_buff[index].dma = dma_addr;
>  		pool->rx_buff[index].skb = skb;
>  		pool->rx_buff[index].pool_index = pool->index;
>  		pool->rx_buff[index].size = pool->buff_size;
> 
> +		/* queue the rx_buff for the next send_subcrq_indirect */
>  		sub_crq = &ind_bufp->indir_arr[ind_bufp->index++];
>  		memset(sub_crq, 0, sizeof(*sub_crq));
>  		sub_crq->rx_add.first = IBMVNIC_CRQ_CMD;
> @@ -405,7 +408,8 @@ static void replenish_rx_pool(struct
> ibmvnic_adapter *adapter,
>  		shift = 8;
>  #endif
>  		sub_crq->rx_add.len = cpu_to_be32(pool->buff_size << shift);
> -		pool->next_free = (pool->next_free + 1) % pool->size;
> +
> +		/* if send_subcrq_indirect queue is full, flush to VIOS */
>  		if (ind_bufp->index == IBMVNIC_MAX_IND_DESCS ||
>  		    i == count - 1) {
>  			lpar_rc =