netdev - Re: [PATCH v1 2/6] staging: qlge: coredump via devlink health reporter

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Date:   Sat, 10 Oct 2020 16:48:09 +0900
From:   Benjamin Poirier <benjamin.poirier@...il.com>
To:     Coiby Xu <coiby.xu@...il.com>
Cc:     devel@...verdev.osuosl.org, Shung-Hsi Yu <shung-hsi.yu@...e.com>,
        Manish Chopra <manishc@...vell.com>,
        "supporter:QLOGIC QLGE 10Gb ETHERNET DRIVER" 
        <GR-Linux-NIC-Dev@...vell.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "open list:QLOGIC QLGE 10Gb ETHERNET DRIVER" <netdev@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 2/6] staging: qlge: coredump via devlink health
 reporter

On 2020-10-08 19:58 +0800, Coiby Xu wrote:
>     $ devlink health dump show DEVICE reporter coredump -p -j
>     {
>         "Core Registers": {
>             "segment": 1,
>             "values": [ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
> ,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 ]
>         },
>         "Test Logic Regs": {
>             "segment": 2,
>             "values": [ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 ]
>         },
>         "RMII Registers": {
>             "segment": 3,
>             "values": [ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 ]
>         },
>         ...
>         "Sem Registers": {
>             "segment": 50,
>             "values": [ 0,0,0,0 ]
>         }
>     }
> 
> Signed-off-by: Coiby Xu <coiby.xu@...il.com>
> ---
>  drivers/staging/qlge/qlge_devlink.c | 131 ++++++++++++++++++++++++++--
>  1 file changed, 125 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/staging/qlge/qlge_devlink.c b/drivers/staging/qlge/qlge_devlink.c
> index aa45e7e368c0..91b6600b94a9 100644
> --- a/drivers/staging/qlge/qlge_devlink.c
> +++ b/drivers/staging/qlge/qlge_devlink.c
> @@ -1,16 +1,135 @@
>  #include "qlge.h"
>  #include "qlge_devlink.h"
>  
> -static int
> -qlge_reporter_coredump(struct devlink_health_reporter *reporter,
> -			struct devlink_fmsg *fmsg, void *priv_ctx,
> -			struct netlink_ext_ack *extack)
> +static int fill_seg_(struct devlink_fmsg *fmsg,

Please include the "qlge_" prefix.

> +		    struct mpi_coredump_segment_header *seg_header,
> +		    u32 *reg_data)
>  {
> -	return 0;
> +	int i;
> +	int header_size = sizeof(struct mpi_coredump_segment_header);
> +	int regs_num = (seg_header->seg_size - header_size) / sizeof(u32);
> +	int err;
> +
> +	err = devlink_fmsg_pair_nest_start(fmsg, seg_header->description);
> +	if (err)
> +		return err;
> +	err = devlink_fmsg_obj_nest_start(fmsg);
> +	if (err)
> +		return err;
> +	err = devlink_fmsg_u32_pair_put(fmsg, "segment", seg_header->seg_num);
> +	if (err)
> +		return err;
> +	err = devlink_fmsg_arr_pair_nest_start(fmsg, "values");
> +	if (err)
> +		return err;
> +	for (i = 0; i < regs_num; i++) {
> +		err = devlink_fmsg_u32_put(fmsg, *reg_data);
> +		if (err)
> +			return err;
> +		reg_data++;
> +	}
> +	err = devlink_fmsg_obj_nest_end(fmsg);
> +	if (err)
> +		return err;
> +	err = devlink_fmsg_arr_pair_nest_end(fmsg);
> +	if (err)
> +		return err;
> +	err = devlink_fmsg_pair_nest_end(fmsg);
> +	return err;
> +}
> +
> +#define fill_seg(seg_hdr, seg_regs)			               \

considering that this macro accesses local variables, it is not really
"function-like". I think an all-caps name would be better to tip-off the
reader.

> +	do {                                                           \
> +		err = fill_seg_(fmsg, &dump->seg_hdr, dump->seg_regs); \
> +		if (err) {					       \
> +			kvfree(dump);                                  \
> +			return err;				       \
> +		}                                                      \
> +	} while (0)
> +
> +static int qlge_reporter_coredump(struct devlink_health_reporter *reporter,
> +				  struct devlink_fmsg *fmsg, void *priv_ctx,
> +				  struct netlink_ext_ack *extack)
> +{
> +	int err = 0;
> +
> +	struct qlge_devlink *dev = devlink_health_reporter_priv(reporter);

Please name this variable ql_devlink, like in qlge_probe().