Re: [PATCH net-next v17 02/13] rtase: Implement the .ndo_open function

From: Simon Horman
Date: Fri May 03 2024 - 04:53:11 EST


On Thu, May 02, 2024 at 05:18:36PM +0800, Justin Lai wrote:
> Implement the .ndo_open function to set default hardware settings
> and initialize the descriptor ring and interrupts. Among them,
> when requesting irq, because the first group of interrupts needs to
> process more events, the overall structure will be different from
> other groups of interrupts, so it needs to be processed separately.
>
> Signed-off-by: Justin Lai <justinlai0215@xxxxxxxxxxx>

Hi Justin,

some minor feedback from my side.

> ---
> .../net/ethernet/realtek/rtase/rtase_main.c | 419 ++++++++++++++++++
> 1 file changed, 419 insertions(+)
>
> diff --git a/drivers/net/ethernet/realtek/rtase/rtase_main.c b/drivers/net/ethernet/realtek/rtase/rtase_main.c
> index 5ddb5f7abfe9..b286aac1eedc 100644
> --- a/drivers/net/ethernet/realtek/rtase/rtase_main.c
> +++ b/drivers/net/ethernet/realtek/rtase/rtase_main.c
> @@ -130,6 +130,293 @@ static u32 rtase_r32(const struct rtase_private *tp, u16 reg)
> return readl(tp->mmio_addr + reg);
> }
>
> +static void rtase_set_rxbufsize(struct rtase_private *tp)
> +{
> + tp->rx_buf_sz = RTASE_RX_BUF_SIZE;
> +}

I'm a big fan of helpers, but maybe it's better to just open-code this one
as it is trivial and seems to only be used once.

..

> +static int rtase_open(struct net_device *dev)
> +{
> + struct rtase_private *tp = netdev_priv(dev);
> + struct rtase_int_vector *ivec = &tp->int_vector[0];
> + const struct pci_dev *pdev = tp->pdev;
> + u16 i, j;
> + int ret;

nit: please use reverse xmas tree order - longest line to shortest -
for local variable declarations in new Networking code.

> +
> + rtase_set_rxbufsize(tp);
> +
> + ret = rtase_alloc_desc(tp);
> + if (ret)
> + goto err_free_all_allocated_mem;
> +
> + ret = rtase_init_ring(dev);
> + if (ret)
> + goto err_free_all_allocated_mem;
> +
> + rtase_hw_config(dev);
> +
> + if (tp->sw_flag & RTASE_SWF_MSIX_ENABLED) {
> + ret = request_irq(ivec->irq, rtase_interrupt, 0,
> + dev->name, ivec);
> + if (ret)
> + goto err_free_all_allocated_irq;

This goto jumps to code that relies on i to set the bounds on a loop.
However, i is not initialised here. Perhaps it should be set to 1?

Flagged by Smatch, and clang-18 W=1 builds.

> +
> + /* request other interrupts to handle multiqueue */
> + for (i = 1; i < tp->int_nums; i++) {
> + ivec = &tp->int_vector[i];
> + snprintf(ivec->name, sizeof(ivec->name), "%s_int%i", tp->dev->name, i);

nit: This line could trivially be split into two lines,
each less than 80 columns wide.

> + ret = request_irq(ivec->irq, rtase_q_interrupt, 0,
> + ivec->name, ivec);
> + if (ret)
> + goto err_free_all_allocated_irq;
> + }
> + } else {
> + ret = request_irq(pdev->irq, rtase_interrupt, 0, dev->name,
> + ivec);
> + if (ret)
> + goto err_free_all_allocated_mem;
> + }
> +
> + rtase_hw_start(dev);
> +
> + for (i = 0; i < tp->int_nums; i++) {
> + ivec = &tp->int_vector[i];
> + napi_enable(&ivec->napi);
> + }
> +
> + netif_carrier_on(dev);
> + netif_wake_queue(dev);
> +
> + return 0;
> +
> +err_free_all_allocated_irq:
> + for (j = 0; j < i; j++)
> + free_irq(tp->int_vector[j].irq, &tp->int_vector[j]);
> +
> +err_free_all_allocated_mem:
> + rtase_free_desc(tp);
> +
> + return ret;
> +}

..