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Message-ID: <2a03fb50-7900-d6e9-bbd6-0ad45b003657@huawei.com>
Date: Wed, 25 Nov 2020 09:57:52 +0800
From: "liwei (GF)" <liwei391@...wei.com>
To: Li Yang <leoyang.li@....com>, Zhao Qiang <qiang.zhao@....com>
CC: "David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Paul Gortmaker <paul.gortmaker@...driver.com>,
Kumar Gala <galak@...nel.crashing.org>,
Timur Tabi <timur@...escale.com>,
Netdev <netdev@...r.kernel.org>,
linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
lkml <linux-kernel@...r.kernel.org>, <guohanjun@...wei.com>
Subject: Re: [PATCH] net/ethernet/freescale: Fix incorrect IS_ERR_VALUE macro
usages
Hi Yang,
On 2020/11/25 6:13, Li Yang wrote:
> On Tue, Nov 24, 2020 at 3:44 PM Li Yang <leoyang.li@....com> wrote:
>>
>> On Tue, Nov 24, 2020 at 12:24 AM Wei Li <liwei391@...wei.com> wrote:
>>>
>>> IS_ERR_VALUE macro should be used only with unsigned long type.
>>> Especially it works incorrectly with unsigned shorter types on
>>> 64bit machines.
>>
>> This is truly a problem for the driver to run on 64-bit architectures.
>> But from an earlier discussion
>> https://patchwork.kernel.org/project/linux-kbuild/patch/1464384685-347275-1-git-send-email-arnd@arndb.de/,
>> the preferred solution would be removing the IS_ERR_VALUE() usage or
>> make the values to be unsigned long.
>>
>> It looks like we are having a bigger problem with the 64-bit support
>> for the driver that the offset variables can also be real pointers
>> which cannot be held with 32-bit data types(when uf_info->bd_mem_part
>> == MEM_PART_SYSTEM). So actually we have to change these offsets to
>> unsigned long, otherwise we are having more serious issues on 64-bit
>> systems. Are you willing to make such changes or you want us to deal
>> with it?
>
> Well, it looks like this hardware block was never integrated on a
> 64-bit SoC and will very likely to keep so. So probably we can keep
> the driver 32-bit only. It is currently limited to PPC32 in Kconfig,
> how did you build it for 64-bit?
>
>>
Thank you for providing the earlier discussion archive. In fact, this
issue is detected by our static analysis tool.
>From my view, there is no harm to fix these potential misuses. But if you
really have decided to keep the driver 32-bit only, please just ingore this patch.
Thanks,
Wei
>>>
>>> Fixes: 4c35630ccda5 ("[POWERPC] Change rheap functions to use ulongs instead of pointers")
>>> Signed-off-by: Wei Li <liwei391@...wei.com>
>>> ---
>>> drivers/net/ethernet/freescale/ucc_geth.c | 30 +++++++++++------------
>>> 1 file changed, 15 insertions(+), 15 deletions(-)
>>>
>>> diff --git a/drivers/net/ethernet/freescale/ucc_geth.c b/drivers/net/ethernet/freescale/ucc_geth.c
>>> index 714b501be7d0..8656d9be256a 100644
>>> --- a/drivers/net/ethernet/freescale/ucc_geth.c
>>> +++ b/drivers/net/ethernet/freescale/ucc_geth.c
>>> @@ -286,7 +286,7 @@ static int fill_init_enet_entries(struct ucc_geth_private *ugeth,
>>> else {
>>> init_enet_offset =
>>> qe_muram_alloc(thread_size, thread_alignment);
>>> - if (IS_ERR_VALUE(init_enet_offset)) {
>>> + if (IS_ERR_VALUE((unsigned long)(int)init_enet_offset)) {
>>> if (netif_msg_ifup(ugeth))
>>> pr_err("Can not allocate DPRAM memory\n");
>>> qe_put_snum((u8) snum);
>>> @@ -2223,7 +2223,7 @@ static int ucc_geth_alloc_tx(struct ucc_geth_private *ugeth)
>>> ugeth->tx_bd_ring_offset[j] =
>>> qe_muram_alloc(length,
>>> UCC_GETH_TX_BD_RING_ALIGNMENT);
>>> - if (!IS_ERR_VALUE(ugeth->tx_bd_ring_offset[j]))
>>> + if (!IS_ERR_VALUE((unsigned long)(int)ugeth->tx_bd_ring_offset[j]))
>>> ugeth->p_tx_bd_ring[j] =
>>> (u8 __iomem *) qe_muram_addr(ugeth->
>>> tx_bd_ring_offset[j]);
>>> @@ -2300,7 +2300,7 @@ static int ucc_geth_alloc_rx(struct ucc_geth_private *ugeth)
>>> ugeth->rx_bd_ring_offset[j] =
>>> qe_muram_alloc(length,
>>> UCC_GETH_RX_BD_RING_ALIGNMENT);
>>> - if (!IS_ERR_VALUE(ugeth->rx_bd_ring_offset[j]))
>>> + if (!IS_ERR_VALUE((unsigned long)(int)ugeth->rx_bd_ring_offset[j]))
>>> ugeth->p_rx_bd_ring[j] =
>>> (u8 __iomem *) qe_muram_addr(ugeth->
>>> rx_bd_ring_offset[j]);
>>> @@ -2510,7 +2510,7 @@ static int ucc_geth_startup(struct ucc_geth_private *ugeth)
>>> ugeth->tx_glbl_pram_offset =
>>> qe_muram_alloc(sizeof(struct ucc_geth_tx_global_pram),
>>> UCC_GETH_TX_GLOBAL_PRAM_ALIGNMENT);
>>> - if (IS_ERR_VALUE(ugeth->tx_glbl_pram_offset)) {
>>> + if (IS_ERR_VALUE((unsigned long)(int)ugeth->tx_glbl_pram_offset)) {
>>> if (netif_msg_ifup(ugeth))
>>> pr_err("Can not allocate DPRAM memory for p_tx_glbl_pram\n");
>>> return -ENOMEM;
>>> @@ -2530,7 +2530,7 @@ static int ucc_geth_startup(struct ucc_geth_private *ugeth)
>>> sizeof(struct ucc_geth_thread_data_tx) +
>>> 32 * (numThreadsTxNumerical == 1),
>>> UCC_GETH_THREAD_DATA_ALIGNMENT);
>>> - if (IS_ERR_VALUE(ugeth->thread_dat_tx_offset)) {
>>> + if (IS_ERR_VALUE((unsigned long)(int)ugeth->thread_dat_tx_offset)) {
>>> if (netif_msg_ifup(ugeth))
>>> pr_err("Can not allocate DPRAM memory for p_thread_data_tx\n");
>>> return -ENOMEM;
>>> @@ -2557,7 +2557,7 @@ static int ucc_geth_startup(struct ucc_geth_private *ugeth)
>>> qe_muram_alloc(ug_info->numQueuesTx *
>>> sizeof(struct ucc_geth_send_queue_qd),
>>> UCC_GETH_SEND_QUEUE_QUEUE_DESCRIPTOR_ALIGNMENT);
>>> - if (IS_ERR_VALUE(ugeth->send_q_mem_reg_offset)) {
>>> + if (IS_ERR_VALUE((unsigned long)(int)ugeth->send_q_mem_reg_offset)) {
>>> if (netif_msg_ifup(ugeth))
>>> pr_err("Can not allocate DPRAM memory for p_send_q_mem_reg\n");
>>> return -ENOMEM;
>>> @@ -2597,7 +2597,7 @@ static int ucc_geth_startup(struct ucc_geth_private *ugeth)
>>> ugeth->scheduler_offset =
>>> qe_muram_alloc(sizeof(struct ucc_geth_scheduler),
>>> UCC_GETH_SCHEDULER_ALIGNMENT);
>>> - if (IS_ERR_VALUE(ugeth->scheduler_offset)) {
>>> + if (IS_ERR_VALUE((unsigned long)(int)ugeth->scheduler_offset)) {
>>> if (netif_msg_ifup(ugeth))
>>> pr_err("Can not allocate DPRAM memory for p_scheduler\n");
>>> return -ENOMEM;
>>> @@ -2644,7 +2644,7 @@ static int ucc_geth_startup(struct ucc_geth_private *ugeth)
>>> qe_muram_alloc(sizeof
>>> (struct ucc_geth_tx_firmware_statistics_pram),
>>> UCC_GETH_TX_STATISTICS_ALIGNMENT);
>>> - if (IS_ERR_VALUE(ugeth->tx_fw_statistics_pram_offset)) {
>>> + if (IS_ERR_VALUE((unsigned long)(int)ugeth->tx_fw_statistics_pram_offset)) {
>>> if (netif_msg_ifup(ugeth))
>>> pr_err("Can not allocate DPRAM memory for p_tx_fw_statistics_pram\n");
>>> return -ENOMEM;
>>> @@ -2681,7 +2681,7 @@ static int ucc_geth_startup(struct ucc_geth_private *ugeth)
>>> ugeth->rx_glbl_pram_offset =
>>> qe_muram_alloc(sizeof(struct ucc_geth_rx_global_pram),
>>> UCC_GETH_RX_GLOBAL_PRAM_ALIGNMENT);
>>> - if (IS_ERR_VALUE(ugeth->rx_glbl_pram_offset)) {
>>> + if (IS_ERR_VALUE((unsigned long)(int)ugeth->rx_glbl_pram_offset)) {
>>> if (netif_msg_ifup(ugeth))
>>> pr_err("Can not allocate DPRAM memory for p_rx_glbl_pram\n");
>>> return -ENOMEM;
>>> @@ -2700,7 +2700,7 @@ static int ucc_geth_startup(struct ucc_geth_private *ugeth)
>>> qe_muram_alloc(numThreadsRxNumerical *
>>> sizeof(struct ucc_geth_thread_data_rx),
>>> UCC_GETH_THREAD_DATA_ALIGNMENT);
>>> - if (IS_ERR_VALUE(ugeth->thread_dat_rx_offset)) {
>>> + if (IS_ERR_VALUE((unsigned long)(int)ugeth->thread_dat_rx_offset)) {
>>> if (netif_msg_ifup(ugeth))
>>> pr_err("Can not allocate DPRAM memory for p_thread_data_rx\n");
>>> return -ENOMEM;
>>> @@ -2721,7 +2721,7 @@ static int ucc_geth_startup(struct ucc_geth_private *ugeth)
>>> qe_muram_alloc(sizeof
>>> (struct ucc_geth_rx_firmware_statistics_pram),
>>> UCC_GETH_RX_STATISTICS_ALIGNMENT);
>>> - if (IS_ERR_VALUE(ugeth->rx_fw_statistics_pram_offset)) {
>>> + if (IS_ERR_VALUE((unsigned long)(int)ugeth->rx_fw_statistics_pram_offset)) {
>>> if (netif_msg_ifup(ugeth))
>>> pr_err("Can not allocate DPRAM memory for p_rx_fw_statistics_pram\n");
>>> return -ENOMEM;
>>> @@ -2741,7 +2741,7 @@ static int ucc_geth_startup(struct ucc_geth_private *ugeth)
>>> qe_muram_alloc(ug_info->numQueuesRx *
>>> sizeof(struct ucc_geth_rx_interrupt_coalescing_entry)
>>> + 4, UCC_GETH_RX_INTERRUPT_COALESCING_ALIGNMENT);
>>> - if (IS_ERR_VALUE(ugeth->rx_irq_coalescing_tbl_offset)) {
>>> + if (IS_ERR_VALUE((unsigned long)(int)ugeth->rx_irq_coalescing_tbl_offset)) {
>>> if (netif_msg_ifup(ugeth))
>>> pr_err("Can not allocate DPRAM memory for p_rx_irq_coalescing_tbl\n");
>>> return -ENOMEM;
>>> @@ -2807,7 +2807,7 @@ static int ucc_geth_startup(struct ucc_geth_private *ugeth)
>>> (sizeof(struct ucc_geth_rx_bd_queues_entry) +
>>> sizeof(struct ucc_geth_rx_prefetched_bds)),
>>> UCC_GETH_RX_BD_QUEUES_ALIGNMENT);
>>> - if (IS_ERR_VALUE(ugeth->rx_bd_qs_tbl_offset)) {
>>> + if (IS_ERR_VALUE((unsigned long)(int)ugeth->rx_bd_qs_tbl_offset)) {
>>> if (netif_msg_ifup(ugeth))
>>> pr_err("Can not allocate DPRAM memory for p_rx_bd_qs_tbl\n");
>>> return -ENOMEM;
>>> @@ -2892,7 +2892,7 @@ static int ucc_geth_startup(struct ucc_geth_private *ugeth)
>>> ugeth->exf_glbl_param_offset =
>>> qe_muram_alloc(sizeof(struct ucc_geth_exf_global_pram),
>>> UCC_GETH_RX_EXTENDED_FILTERING_GLOBAL_PARAMETERS_ALIGNMENT);
>>> - if (IS_ERR_VALUE(ugeth->exf_glbl_param_offset)) {
>>> + if (IS_ERR_VALUE((unsigned long)(int)ugeth->exf_glbl_param_offset)) {
>>> if (netif_msg_ifup(ugeth))
>>> pr_err("Can not allocate DPRAM memory for p_exf_glbl_param\n");
>>> return -ENOMEM;
>>> @@ -3026,7 +3026,7 @@ static int ucc_geth_startup(struct ucc_geth_private *ugeth)
>>>
>>> /* Allocate InitEnet command parameter structure */
>>> init_enet_pram_offset = qe_muram_alloc(sizeof(struct ucc_geth_init_pram), 4);
>>> - if (IS_ERR_VALUE(init_enet_pram_offset)) {
>>> + if (IS_ERR_VALUE((unsigned long)(int)init_enet_pram_offset)) {
>>> if (netif_msg_ifup(ugeth))
>>> pr_err("Can not allocate DPRAM memory for p_init_enet_pram\n");
>>> return -ENOMEM;
>>> --
>>> 2.17.1
>>>
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