netdev - Re: [PATCH net-next 2/9] ibmvnic: Fix up some comments and messages

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Date:   Tue, 31 Aug 2021 18:28:11 -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 2/9] ibmvnic: Fix up some comments and messages

On 2021-08-31 17:08, Sukadev Bhattiprolu wrote:
> Add/update some comments/function headers and fix up some messages.
> 
> Signed-off-by: Sukadev Bhattiprolu <sukadev@...ux.ibm.com>
Reviewed-by: Dany Madden <drt@...ux.ibm.com>

> ---
>  drivers/net/ethernet/ibm/ibmvnic.c | 40 +++++++++++++++++++++++++-----
>  1 file changed, 34 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/net/ethernet/ibm/ibmvnic.c
> b/drivers/net/ethernet/ibm/ibmvnic.c
> index e8b1231be485..911315b10731 100644
> --- a/drivers/net/ethernet/ibm/ibmvnic.c
> +++ b/drivers/net/ethernet/ibm/ibmvnic.c
> @@ -243,14 +243,13 @@ static int alloc_long_term_buff(struct
> ibmvnic_adapter *adapter,
> 
>  	rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
>  	if (rc) {
> -		dev_err(dev,
> -			"Long term map request aborted or timed out,rc = %d\n",
> +		dev_err(dev, "LTB map request aborted or timed out, rc = %d\n",
>  			rc);
>  		goto out;
>  	}
> 
>  	if (adapter->fw_done_rc) {
> -		dev_err(dev, "Couldn't map long term buffer,rc = %d\n",
> +		dev_err(dev, "Couldn't map LTB, rc = %d\n",
>  			adapter->fw_done_rc);
>  		rc = -1;
>  		goto out;
> @@ -281,7 +280,9 @@ static void free_long_term_buff(struct
> ibmvnic_adapter *adapter,
>  	    adapter->reset_reason != VNIC_RESET_MOBILITY &&
>  	    adapter->reset_reason != VNIC_RESET_TIMEOUT)
>  		send_request_unmap(adapter, ltb->map_id);
> +
>  	dma_free_coherent(dev, ltb->size, ltb->buff, ltb->addr);
> +
>  	ltb->buff = NULL;
>  	ltb->map_id = 0;
>  }
> @@ -574,6 +575,10 @@ static int reset_rx_pools(struct ibmvnic_adapter 
> *adapter)
>  	return 0;
>  }
> 
> +/**
> + * Release any rx_pools attached to @adapter.
> + * Safe to call this multiple times - even if no pools are attached.
> + */
>  static void release_rx_pools(struct ibmvnic_adapter *adapter)
>  {
>  	struct ibmvnic_rx_pool *rx_pool;
> @@ -628,6 +633,9 @@ static int init_rx_pools(struct net_device *netdev)
>  		return -1;
>  	}
> 
> +	/* Set num_active_rx_pools early. If we fail below after partial
> +	 * allocation, release_rx_pools() will know how many to look for.
> +	 */
>  	adapter->num_active_rx_pools = rxadd_subcrqs;
> 
>  	for (i = 0; i < rxadd_subcrqs; i++) {
> @@ -646,6 +654,7 @@ static int init_rx_pools(struct net_device *netdev)
>  		rx_pool->free_map = kcalloc(rx_pool->size, sizeof(int),
>  					    GFP_KERNEL);
>  		if (!rx_pool->free_map) {
> +			dev_err(dev, "Couldn't alloc free_map %d\n", i);
>  			release_rx_pools(adapter);
>  			return -1;
>  		}
> @@ -739,10 +748,17 @@ static void release_one_tx_pool(struct
> ibmvnic_adapter *adapter,
>  	free_long_term_buff(adapter, &tx_pool->long_term_buff);
>  }
> 
> +/**
> + * Release any tx and tso pools attached to @adapter.
> + * Safe to call this multiple times - even if no pools are attached.
> + */
>  static void release_tx_pools(struct ibmvnic_adapter *adapter)
>  {
>  	int i;
> 
> +	/* init_tx_pools() ensures that ->tx_pool and ->tso_pool are
> +	 * both NULL or both non-NULL. So we only need to check one.
> +	 */
>  	if (!adapter->tx_pool)
>  		return;
> 
> @@ -793,6 +809,7 @@ static int init_one_tx_pool(struct net_device 
> *netdev,
>  static int init_tx_pools(struct net_device *netdev)
>  {
>  	struct ibmvnic_adapter *adapter = netdev_priv(netdev);
> +	struct device *dev = &adapter->vdev->dev;
>  	int tx_subcrqs;
>  	u64 buff_size;
>  	int i, rc;
> @@ -805,17 +822,27 @@ static int init_tx_pools(struct net_device 
> *netdev)
> 
>  	adapter->tso_pool = kcalloc(tx_subcrqs,
>  				    sizeof(struct ibmvnic_tx_pool), GFP_KERNEL);
> +	/* To simplify release_tx_pools() ensure that ->tx_pool and
> +	 * ->tso_pool are either both NULL or both non-NULL.
> +	 */
>  	if (!adapter->tso_pool) {
>  		kfree(adapter->tx_pool);
>  		adapter->tx_pool = NULL;
>  		return -1;
>  	}
> 
> +	/* Set num_active_tx_pools early. If we fail below after partial
> +	 * allocation, release_tx_pools() will know how many to look for.
> +	 */
>  	adapter->num_active_tx_pools = tx_subcrqs;
> 
>  	for (i = 0; i < tx_subcrqs; i++) {
>  		buff_size = adapter->req_mtu + VLAN_HLEN;
>  		buff_size = ALIGN(buff_size, L1_CACHE_BYTES);
> +
> +		dev_dbg(dev, "Init tx pool %d [%llu, %llu]\n",
> +			i, adapter->req_tx_entries_per_subcrq, buff_size);
> +
>  		rc = init_one_tx_pool(netdev, &adapter->tx_pool[i],
>  				      adapter->req_tx_entries_per_subcrq,
>  				      buff_size);
> @@ -4774,9 +4801,10 @@ static void handle_query_map_rsp(union 
> ibmvnic_crq *crq,
>  		dev_err(dev, "Error %ld in QUERY_MAP_RSP\n", rc);
>  		return;
>  	}
> -	netdev_dbg(netdev, "page_size = %d\ntot_pages = %d\nfree_pages = 
> %d\n",
> -		   crq->query_map_rsp.page_size, crq->query_map_rsp.tot_pages,
> -		   crq->query_map_rsp.free_pages);
> +	netdev_dbg(netdev, "page_size = %d\ntot_pages = %u\nfree_pages = 
> %u\n",
> +		   crq->query_map_rsp.page_size,
> +		   __be32_to_cpu(crq->query_map_rsp.tot_pages),
> +		   __be32_to_cpu(crq->query_map_rsp.free_pages));
>  }
> 
>  static void handle_query_cap_rsp(union ibmvnic_crq *crq,