netdev - Re: [PATCH net v8 2/2] net/ps3_gelic_net: Use dma_mapping

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Date:   Sat, 18 Mar 2023 10:37:39 -0700
From:   Geoff Levand <geoff@...radead.org>
To:     Alexander H Duyck <alexander.duyck@...il.com>,
        netdev@...r.kernel.org, Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>
Cc:     Alexander Lobakin <alexandr.lobakin@...el.com>,
        Paolo Abeni <pabeni@...hat.com>
Subject: Re: [PATCH net v8 2/2] net/ps3_gelic_net: Use dma_mapping_error

On 3/11/23 14:41, Alexander H Duyck wrote:
> On Sat, 2023-03-11 at 21:46 +0000, Geoff Levand wrote:
>> The current Gelic Etherenet driver was checking the return value of its
>> dma_map_single call, and not using the dma_mapping_error() routine.
>>
>> Fixes runtime problems like these:
>>
>>   DMA-API: ps3_gelic_driver sb_05: device driver failed to check map error
>>   WARNING: CPU: 0 PID: 0 at kernel/dma/debug.c:1027 .check_unmap+0x888/0x8dc
>>
>> Fixes: 02c1889166b4 ("ps3: gigabit ethernet driver for PS3, take3")
>> Signed-off-by: Geoff Levand <geoff@...radead.org>
>> ---
>>  drivers/net/ethernet/toshiba/ps3_gelic_net.c | 24 +++++++++++---------
>>  1 file changed, 13 insertions(+), 11 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/toshiba/ps3_gelic_net.c b/drivers/net/ethernet/toshiba/ps3_gelic_net.c
>> index 56557fc8d18a..87d3c768286e 100644
>> --- a/drivers/net/ethernet/toshiba/ps3_gelic_net.c
>> +++ b/drivers/net/ethernet/toshiba/ps3_gelic_net.c
>> @@ -325,15 +325,17 @@ static int gelic_card_init_chain(struct gelic_card *card,
>>  
>>  	/* set up the hardware pointers in each descriptor */
>>  	for (i = 0; i < no; i++, descr++) {
>> +		dma_addr_t cpu_addr;
>> +
>>  		gelic_descr_set_status(descr, GELIC_DESCR_DMA_NOT_IN_USE);
>> -		descr->bus_addr =
>> -			dma_map_single(ctodev(card), descr,
>> -				       GELIC_DESCR_SIZE,
>> -				       DMA_BIDIRECTIONAL);
>>  
>> -		if (!descr->bus_addr)
>> +		cpu_addr = dma_map_single(ctodev(card), descr,
>> +					  GELIC_DESCR_SIZE, DMA_BIDIRECTIONAL);
>> +
>> +		if (dma_mapping_error(ctodev(card), cpu_addr))
>>  			goto iommu_error;
>>  
>> +		descr->bus_addr = cpu_to_be32(cpu_addr);
>>  		descr->next = descr + 1;
>>  		descr->prev = descr - 1;
>>  	}
>> @@ -377,6 +379,7 @@ static int gelic_card_init_chain(struct gelic_card *card,
>>  static int gelic_descr_prepare_rx(struct gelic_card *card,
>>  				  struct gelic_descr *descr)
>>  {
>> +	dma_addr_t cpu_addr;
>>  	int offset;
>>  
>>  	if (gelic_descr_get_status(descr) !=  GELIC_DESCR_DMA_NOT_IN_USE)
>> @@ -398,11 +401,10 @@ static int gelic_descr_prepare_rx(struct gelic_card *card,
>>  	if (offset)
>>  		skb_reserve(descr->skb, GELIC_NET_RXBUF_ALIGN - offset);
>>  	/* io-mmu-map the skb */
>> -	descr->buf_addr = cpu_to_be32(dma_map_single(ctodev(card),
>> -						     descr->skb->data,
>> -						     gelic_rx_skb_size,
>> -						     DMA_FROM_DEVICE));
>> -	if (!descr->buf_addr) {
>> +	cpu_addr = dma_map_single(ctodev(card), descr->skb->data,
>> +				  gelic_rx_skb_size, DMA_FROM_DEVICE);
>> +	descr->buf_addr = cpu_to_be32(cpu_addr);
>> +	if (dma_mapping_error(ctodev(card), cpu_addr)) {
>>  		dev_kfree_skb_any(descr->skb);
>>  		descr->skb = NULL;
>>  		dev_info(ctodev(card),
>> @@ -782,7 +784,7 @@ static int gelic_descr_prepare_tx(struct gelic_card *card,
>>  
>>  	buf = dma_map_single(ctodev(card), skb->data, skb->len, DMA_TO_DEVICE);
>>  
>> -	if (!buf) {
>> +	if (dma_mapping_error(ctodev(card), buf)) {
>>  		dev_err(ctodev(card),
>>  			"dma map 2 failed (%p, %i). Dropping packet\n",
>>  			skb->data, skb->len);
> 
> Looks good to me. The only tweak I would make is maybe using "dma_addr"
> , "phys_addr" or "bus_addr" instead of "cpu_addr", however that is more
> cosmetic than anything else.

Well, cpu_addr is used for cpu_to_be32(cpu_addr)...

> Reviewed-by: Alexander Duyck <alexanderduyck@...com>

Thanks for the review.

-Geoff