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Date: Thu, 28 Apr 2022 17:58:38 +0200
From: Miquel Raynal <miquel.raynal@...tlin.com>
To: Alexander Aring <alex.aring@...il.com>,
Stefan Schmidt <stefan@...enfreihafen.org>,
linux-wpan@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
Xue Liu <liuxuenetmail@...il.com>,
Marcel Holtmann <marcel@...tmann.org>,
Harry Morris <harrymorris12@...il.com>,
David Girault <david.girault@...vo.com>,
Romuald Despres <romuald.despres@...vo.com>,
Frederic Blain <frederic.blain@...vo.com>,
Nicolas Schodet <nico@...fr.eu.org>,
Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH wpan-next v3 3/4] net: mac802154: Set durations
automatically
Hi Stefan,
miquel.raynal@...tlin.com wrote on Tue, 1 Feb 2022 19:06:28 +0100:
> As depicted in the IEEE 802.15.4 specification, modulation/bands are
> tight to a number of page/channels so we can for most of them derive the
> durations automatically.
>
> The two locations that must call this new helper to set the variou
> symbol durations are:
> - when manually requesting a channel change though the netlink interface
> - at PHY creation, once the device driver has set the default
> page/channel
>
> If an information is missing, the symbol duration is not touched, a
> debug message is eventually printed. This keeps the compatibility with
> the unconverted drivers for which it was too complicated for me to find
> their precise information. If they initially provided a symbol duration,
> it would be kept. If they don't, the symbol duration value is left
> untouched.
>
> Once the symbol duration derived, the lifs and sifs durations are
> updated as well.
>
> Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
> ---
> include/net/cfg802154.h | 2 ++
> net/mac802154/cfg.c | 1 +
> net/mac802154/main.c | 46 +++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 49 insertions(+)
>
> diff --git a/include/net/cfg802154.h b/include/net/cfg802154.h
> index 8a4b6a50452f..49b4bcc24032 100644
> --- a/include/net/cfg802154.h
> +++ b/include/net/cfg802154.h
> @@ -405,4 +405,6 @@ static inline const char *wpan_phy_name(struct wpan_phy *phy)
> return dev_name(&phy->dev);
> }
>
> +void ieee802154_configure_durations(struct wpan_phy *phy);
> +
> #endif /* __NET_CFG802154_H */
> diff --git a/net/mac802154/cfg.c b/net/mac802154/cfg.c
> index fbeebe3bc31d..1e4a9f74ed43 100644
> --- a/net/mac802154/cfg.c
> +++ b/net/mac802154/cfg.c
> @@ -118,6 +118,7 @@ ieee802154_set_channel(struct wpan_phy *wpan_phy, u8 page, u8 channel)
> if (!ret) {
> wpan_phy->current_page = page;
> wpan_phy->current_channel = channel;
> + ieee802154_configure_durations(wpan_phy);
> }
>
> return ret;
> diff --git a/net/mac802154/main.c b/net/mac802154/main.c
> index 53153367f9d0..5546ef86e231 100644
> --- a/net/mac802154/main.c
> +++ b/net/mac802154/main.c
> @@ -113,6 +113,50 @@ ieee802154_alloc_hw(size_t priv_data_len, const struct ieee802154_ops *ops)
> }
> EXPORT_SYMBOL(ieee802154_alloc_hw);
>
> +void ieee802154_configure_durations(struct wpan_phy *phy)
> +{
> + u32 duration = 0;
> +
> + switch (phy->current_page) {
> + case 0:
> + if (BIT(phy->current_page) & 0x1)
I am very sorry to spot this only now but this is wrong.
all the conditions from here and below should be:
if (BIT(phy->current_channel & <mask>))
The masks look good, the durations as well, but the conditions are
wrong.
> + /* 868 MHz BPSK 802.15.4-2003: 20 ksym/s */
> + duration = 50 * NSEC_PER_USEC;
> + else if (phy->current_page & 0x7FE)
Ditto
> + /* 915 MHz BPSK 802.15.4-2003: 40 ksym/s */
> + duration = 25 * NSEC_PER_USEC;
> + else if (phy->current_page & 0x7FFF800)
Ditto
> + /* 2400 MHz O-QPSK 802.15.4-2006: 62.5 ksym/s */
> + duration = 16 * NSEC_PER_USEC;
> + break;
> + case 2:
> + if (BIT(phy->current_page) & 0x1)
Ditto
> + /* 868 MHz O-QPSK 802.15.4-2006: 25 ksym/s */
> + duration = 40 * NSEC_PER_USEC;
> + else if (phy->current_page & 0x7FE)
Ditto
> + /* 915 MHz O-QPSK 802.15.4-2006: 62.5 ksym/s */
> + duration = 16 * NSEC_PER_USEC;
> + break;
> + case 3:
> + if (BIT(phy->current_page) & 0x3FFF)
Ditto
> + /* 2.4 GHz CSS 802.15.4a-2007: 1/6 Msym/s */
> + duration = 6 * NSEC_PER_USEC;
> + break;
I see it's "only" in wpan-next (781830c800dd "net: mac802154: Set
durations automatically") and was not yet pulled in the net-next
tree so please let me know what you prefer: I can either provide a
proper patch to fit it (without upstream Fixes reference), or you can
just apply this diff below and push -f the branch. Let me know what you
prefer.
Again, sorry to only see this now.
Thanks,
Miquèl
---
commit 4122765e5f982ed8f0ccea5fd813ef4d53d20a90 (HEAD)
Author: Miquel Raynal <miquel.raynal@...tlin.com>
Date: Thu Apr 28 17:57:59 2022 +0200
fixup! net: mac802154: Set durations automatically
diff --git a/net/mac802154/main.c b/net/mac802154/main.c
index 5546ef86e231..bbbdac6ee028 100644
--- a/net/mac802154/main.c
+++ b/net/mac802154/main.c
@@ -119,26 +119,26 @@ void ieee802154_configure_durations(struct wpan_phy *phy)
switch (phy->current_page) {
case 0:
- if (BIT(phy->current_page) & 0x1)
+ if (BIT(phy->current_channel) & 0x1)
/* 868 MHz BPSK 802.15.4-2003: 20 ksym/s */
duration = 50 * NSEC_PER_USEC;
- else if (phy->current_page & 0x7FE)
+ else if (phy->current_channel & 0x7FE)
/* 915 MHz BPSK 802.15.4-2003: 40 ksym/s */
duration = 25 * NSEC_PER_USEC;
- else if (phy->current_page & 0x7FFF800)
+ else if (phy->current_channel & 0x7FFF800)
/* 2400 MHz O-QPSK 802.15.4-2006: 62.5 ksym/s */
duration = 16 * NSEC_PER_USEC;
break;
case 2:
- if (BIT(phy->current_page) & 0x1)
+ if (BIT(phy->current_channel) & 0x1)
/* 868 MHz O-QPSK 802.15.4-2006: 25 ksym/s */
duration = 40 * NSEC_PER_USEC;
- else if (phy->current_page & 0x7FE)
+ else if (phy->current_channel & 0x7FE)
/* 915 MHz O-QPSK 802.15.4-2006: 62.5 ksym/s */
duration = 16 * NSEC_PER_USEC;
break;
case 3:
- if (BIT(phy->current_page) & 0x3FFF)
+ if (BIT(phy->current_channel) & 0x3FFF)
/* 2.4 GHz CSS 802.15.4a-2007: 1/6 Msym/s */
duration = 6 * NSEC_PER_USEC;
break;
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