Abhishek Kumar <kua...@chromium.org> writes:
> Board data files wrapped inside board-2.bin files are
> identified based on a combination of bus architecture,
> chip-id, board-id or variants. Here is one such example
> of a BDF entry in board-2.bin file:
> bus=snoc,qmi-board-id=67,qmi-chip-id=320,variant=GO_XXXX
> It is possible for few platforms none of the combinations
> of bus,qmi-board,chip-id or variants match, e.g. if
> board-id is not programmed and thus reads board-id=0xff,
> there won't be any matching BDF to be found. In such
> situations, the wlan will fail to enumerate.
>
> Currently, to search for BDF, there are two fallback
> boardnames creates to search for BDFs in case the full BDF
> is not found. It is still possible that even the fallback
> boardnames do not match.
>
> As an improvement, search for BDF with full BDF combination
> and perform the fallback searches by stripping down the last
> elements until a BDF entry is found or none is found for all
> possible BDF combinations.e.g.
> Search for initial BDF first then followed by reduced BDF
> names as follows:
> bus=snoc,qmi-board-id=67,qmi-chip-id=320,variant=GO_XXXX
> bus=snoc,qmi-board-id=67,qmi-chip-id=320
> bus=snoc,qmi-board-id=67
> bus=snoc
> <No BDF found>
>
> Tested-on: WCN3990/hw1.0 WLAN.HL.3.2.2.c10-00754-QCAHLSWMTPL-1
> Signed-off-by: Abhishek Kumar <kua...@chromium.org>
> ---
>
> Changes in v3:
> - As discussed, instead of adding support for default BDF in DT, added
> a method to drop the last elements from full BDF until a BDF is found.
> - Previous patch was "ath10k: search for default BDF name provided in DT"
>
> drivers/net/wireless/ath/ath10k/core.c | 65 +++++++++++++-------------
> 1 file changed, 32 insertions(+), 33 deletions(-)
>
> diff --git a/drivers/net/wireless/ath/ath10k/core.c
> b/drivers/net/wireless/ath/ath10k/core.c
> index 688177453b07..ebb0d2a02c28 100644
> --- a/drivers/net/wireless/ath/ath10k/core.c
> +++ b/drivers/net/wireless/ath/ath10k/core.c
> @@ -1426,15 +1426,31 @@ static int ath10k_core_search_bd(struct ath10k *ar,
> return ret;
> }
>
> +static bool ath10k_create_reduced_boardname(struct ath10k *ar, char
> *boardname)
"static int" as you use error values. Strange that the compiler doesn't
warn about that.
> +{
> + /* Find last BDF element */
> + char *last_field = strrchr(boardname, ',');
> +
> + if (last_field) {
> + /* Drop the last BDF element */
> + last_field[0] = '\0';
> + ath10k_dbg(ar, ATH10K_DBG_BOOT,
> + "boardname =%s\n", boardname);
> + return 0;
> + }
> + return -ENODATA;
I would invert the check:
if (!last_field)
return -ENODATA;
/* Drop the last BDF element */
last_field[0] = '\0';
ath10k_dbg(ar, ATH10K_DBG_BOOT, "boot reduced boardname %s\n",
boardname);
return 0;
Also I changed the style used in the debug message.
https://wireless.wiki.kernel.org/en/users/drivers/ath10k/codingstyle#debug_messages
> data += magic_len;
> len -= magic_len;
>
> - /* attempt to find boardname in the IE list */
> - ret = ath10k_core_search_bd(ar, boardname, data, len);
> + memcpy(temp_boardname, boardname, board_len);
> + ath10k_dbg(ar, ATH10K_DBG_BOOT, "boardname :%s\n", boardname);
"boot boardname %s\n"
>
> - /* if we didn't find it and have a fallback name, try that */
> - if (ret == -ENOENT && fallback_boardname1)
> - ret = ath10k_core_search_bd(ar, fallback_boardname1, data, len);
> +retry_search:
> + /* attempt to find boardname in the IE list */
> + ret = ath10k_core_search_bd(ar, temp_boardname, data, len);
>
> - if (ret == -ENOENT && fallback_boardname2)
> - ret = ath10k_core_search_bd(ar, fallback_boardname2, data, len);
> + /* If the full BDF entry was not found then drop the last element and
> + * recheck until a BDF is found or until all options are exhausted.
> + */
> + if (ret == -ENOENT)
> + if (!ath10k_create_reduced_boardname(ar, temp_boardname))
> + goto retry_search;
>
> if (ret == -ENOENT) {
> ath10k_err(ar,
> "failed to fetch board data for %s from %s/%s\n",
> - boardname, ar->hw_params.fw.dir, filename);
> + temp_boardname, ar->hw_params.fw.dir, filename);
> ret = -ENODATA;
> }
This is hard to read, what about the loop below? Though I'm sure I
missed some corner case but I hope you get the idea. It's always good to
have a limit for the loops to avoid looping forever.
for (i = 0; i < 20; i++) {
/* attempt to find boardname in the IE list */
ret = ath10k_core_search_bd(ar, temp_boardname, data, len);
if (ret != -ENOENT)
/* found it or something was wrong */
break;
/* If the full BDF entry was not found then drop the last
element and
* recheck until a BDF is found or until all options are
exhausted.
*/
ret = ath10k_create_reduced_boardname(ar, temp_boardname);
if (ret) {
ath10k_err(ar,
"failed to fetch board data for %s from
%s/%s\n",
temp_boardname, ar->hw_params.fw.dir,
filename);
ret = -ENODATA;
break;
}
};
if (ret)
goto err;
return 0;
--
https://patchwork.kernel.org/project/linux-wireless/list/
https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
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