linux-kernel - Re: [PATCH net] net: mana: Support holes in device list reply msg

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Message-ID: <20250307102929.GA21981@linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net>
Date: Fri, 7 Mar 2025 02:29:29 -0800
From: Shradha Gupta <shradhagupta@...ux.microsoft.com>
To: Haiyang Zhang <haiyangz@...rosoft.com>
Cc: linux-hyperv@...r.kernel.org, netdev@...r.kernel.org,
	decui@...rosoft.com, stephen@...workplumber.org, kys@...rosoft.com,
	paulros@...rosoft.com, olaf@...fle.de, vkuznets@...hat.com,
	davem@...emloft.net, wei.liu@...nel.org, edumazet@...gle.com,
	kuba@...nel.org, pabeni@...hat.com, leon@...nel.org,
	longli@...rosoft.com, ssengar@...ux.microsoft.com,
	linux-rdma@...r.kernel.org, daniel@...earbox.net,
	john.fastabend@...il.com, bpf@...r.kernel.org, ast@...nel.org,
	hawk@...nel.org, tglx@...utronix.de, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Subject: Re: [PATCH net] net: mana: Support holes in device list reply msg

On Wed, Mar 05, 2025 at 01:46:21PM -0800, Haiyang Zhang wrote:
> According to GDMA protocol, holes (zeros) are allowed at the beginning
> or middle of the gdma_list_devices_resp message. The existing code
> cannot properly handle this, and may miss some devices in the list.
> 
> To fix, scan the entire list until the num_of_devs are found, or until
> the end of the list.
> 
> Cc: stable@...r.kernel.org
> Fixes: ca9c54d2d6a5 ("net: mana: Add a driver for Microsoft Azure Network Adapter (MANA)")
> Signed-off-by: Haiyang Zhang <haiyangz@...rosoft.com>
> 
> ---
>  drivers/net/ethernet/microsoft/mana/gdma_main.c | 16 ++++++++++++----
>  include/net/mana/gdma.h                         | 11 +++++++----
>  2 files changed, 19 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/net/ethernet/microsoft/mana/gdma_main.c b/drivers/net/ethernet/microsoft/mana/gdma_main.c
> index c15a5ef4674e..df3ab31974b1 100644
> --- a/drivers/net/ethernet/microsoft/mana/gdma_main.c
> +++ b/drivers/net/ethernet/microsoft/mana/gdma_main.c
> @@ -134,9 +134,10 @@ static int mana_gd_detect_devices(struct pci_dev *pdev)
>  	struct gdma_list_devices_resp resp = {};
>  	struct gdma_general_req req = {};
>  	struct gdma_dev_id dev;
> -	u32 i, max_num_devs;
> +	int found_dev = 0;
>  	u16 dev_type;
>  	int err;
> +	u32 i;
>  
>  	mana_gd_init_req_hdr(&req.hdr, GDMA_LIST_DEVICES, sizeof(req),
>  			     sizeof(resp));
> @@ -148,12 +149,19 @@ static int mana_gd_detect_devices(struct pci_dev *pdev)
>  		return err ? err : -EPROTO;
>  	}
>  
> -	max_num_devs = min_t(u32, MAX_NUM_GDMA_DEVICES, resp.num_of_devs);
> -
> -	for (i = 0; i < max_num_devs; i++) {
> +	for (i = 0; i < GDMA_DEV_LIST_SIZE &&
> +		found_dev < resp.num_of_devs; i++) {
>  		dev = resp.devs[i];
>  		dev_type = dev.type;
>  
> +		/* Skip empty devices */
> +		if (dev.as_uint32 == 0)
> +			continue;
> +
> +		found_dev++;
> +		dev_info(gc->dev, "Got devidx:%u, type:%u, instance:%u\n", i,
> +			 dev.type, dev.instance);
> +
>  		/* HWC is already detected in mana_hwc_create_channel(). */
>  		if (dev_type == GDMA_DEVICE_HWC)
>  			continue;
> diff --git a/include/net/mana/gdma.h b/include/net/mana/gdma.h
> index 90f56656b572..62e9d7673862 100644
> --- a/include/net/mana/gdma.h
> +++ b/include/net/mana/gdma.h
> @@ -408,8 +408,6 @@ struct gdma_context {
>  	struct gdma_dev		mana_ib;
>  };
>  
> -#define MAX_NUM_GDMA_DEVICES	4
> -
>  static inline bool mana_gd_is_mana(struct gdma_dev *gd)
>  {
>  	return gd->dev_id.type == GDMA_DEVICE_MANA;
> @@ -556,11 +554,15 @@ enum {
>  #define GDMA_DRV_CAP_FLAG_1_HWC_TIMEOUT_RECONFIG BIT(3)
>  #define GDMA_DRV_CAP_FLAG_1_VARIABLE_INDIRECTION_TABLE_SUPPORT BIT(5)
>  
> +/* Driver can handle holes (zeros) in the device list */
> +#define GDMA_DRV_CAP_FLAG_1_DEV_LIST_HOLES_SUP BIT(11)
> +
>  #define GDMA_DRV_CAP_FLAGS1 \
>  	(GDMA_DRV_CAP_FLAG_1_EQ_SHARING_MULTI_VPORT | \
>  	 GDMA_DRV_CAP_FLAG_1_NAPI_WKDONE_FIX | \
>  	 GDMA_DRV_CAP_FLAG_1_HWC_TIMEOUT_RECONFIG | \
> -	 GDMA_DRV_CAP_FLAG_1_VARIABLE_INDIRECTION_TABLE_SUPPORT)
> +	 GDMA_DRV_CAP_FLAG_1_VARIABLE_INDIRECTION_TABLE_SUPPORT | \
> +	 GDMA_DRV_CAP_FLAG_1_DEV_LIST_HOLES_SUP)
>  
>  #define GDMA_DRV_CAP_FLAGS2 0
>  
> @@ -621,11 +623,12 @@ struct gdma_query_max_resources_resp {
>  }; /* HW DATA */
>  
>  /* GDMA_LIST_DEVICES */
> +#define GDMA_DEV_LIST_SIZE 64
>  struct gdma_list_devices_resp {
>  	struct gdma_resp_hdr hdr;
>  	u32 num_of_devs;
>  	u32 reserved;
> -	struct gdma_dev_id devs[64];
> +	struct gdma_dev_id devs[GDMA_DEV_LIST_SIZE];
>  }; /* HW DATA */
>  
>  /* GDMA_REGISTER_DEVICE */

Reviewed-by: Shradha Gupta <shradhagupta@...rosoft.com>
> -- 
> 2.34.1