From: Vladimir Oltean <olteanv@gmail.com>
To: Dan Carpenter <dan.carpenter@oracle.com>
Cc: kbuild@lists.01.org, "David S . Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
netdev@vger.kernel.org, lkp@intel.com, kbuild-all@lists.01.org,
Andrew Lunn <andrew@lunn.ch>,
Florian Fainelli <f.fainelli@gmail.com>,
Vivien Didelot <vivien.didelot@gmail.com>,
Richard Cochran <richardcochran@gmail.com>,
Claudiu Manoil <claudiu.manoil@nxp.com>,
Alexandre Belloni <alexandre.belloni@bootlin.com>,
Vladimir Oltean <vladimir.oltean@nxp.com>
Subject: Re: [PATCH net-next 09/12] net: dsa: tag_ocelot: create separate tagger for Seville
Date: Mon, 15 Feb 2021 15:19:31 +0200 [thread overview]
Message-ID: <20210215131931.4nibzc53doqiignb@skbuf> (raw)
In-Reply-To: <20210215130003.GL2087@kadam>
Hi Dan,
On Mon, Feb 15, 2021 at 04:00:04PM +0300, Dan Carpenter wrote:
> db->index is less than db->num_ports which 32 or less but sometimes it
> comes from the device tree so who knows.
The destination port mask is copied into a 12-bit field of the packet,
starting at bit offset 67 and ending at 56:
static inline void ocelot_ifh_set_dest(void *injection, u64 dest)
{
packing(injection, &dest, 67, 56, OCELOT_TAG_LEN, PACK, 0);
}
So this DSA tagging protocol supports at most 12 bits, which is clearly
less than 32. Attempting to send to a port number > 12 will cause the
packing() call to truncate way before there will be 32-bit truncation
due to type promotion of the BIT(port) argument towards u64.
> The ocelot_ifh_set_dest() function takes a u64 though and that
> suggests that BIT() should be changed to BIT_ULL().
I understand that you want to silence the warning, which fundamentally
comes from the packing() API which works with u64 values and nothing of
a smaller size. So I can send a patch which replaces BIT(port) with
BIT_ULL(port), even if in practice both are equally fine.
next prev parent reply other threads:[~2021-02-15 13:20 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-13 0:14 [PATCH net-next 00/12] PTP for DSA tag_ocelot_8021q Vladimir Oltean
2021-02-13 0:14 ` [PATCH net-next 01/12] net: mscc: ocelot: stop returning IRQ_NONE in ocelot_xtr_irq_handler Vladimir Oltean
2021-02-13 0:14 ` [PATCH net-next 02/12] net: mscc: ocelot: only drain extraction queue on error Vladimir Oltean
2021-02-13 0:14 ` [PATCH net-next 03/12] net: mscc: ocelot: better error handling in ocelot_xtr_irq_handler Vladimir Oltean
2021-02-13 0:14 ` [PATCH net-next 04/12] net: mscc: ocelot: use DIV_ROUND_UP helper in ocelot_port_inject_frame Vladimir Oltean
2021-02-13 0:14 ` [PATCH net-next 05/12] net: mscc: ocelot: refactor ocelot_port_inject_frame out of ocelot_port_xmit Vladimir Oltean
2021-02-13 0:14 ` [PATCH net-next 06/12] net: dsa: tag_ocelot: avoid accessing ds->priv in ocelot_rcv Vladimir Oltean
2021-02-13 0:14 ` [PATCH net-next 07/12] net: mscc: ocelot: use common tag parsing code with DSA Vladimir Oltean
2021-02-13 0:14 ` [PATCH net-next 08/12] net: dsa: tag_ocelot: single out PTP-related transmit tag processing Vladimir Oltean
2021-02-13 0:14 ` [PATCH net-next 09/12] net: dsa: tag_ocelot: create separate tagger for Seville Vladimir Oltean
2021-02-15 13:00 ` Dan Carpenter
2021-02-15 13:19 ` Vladimir Oltean [this message]
2021-02-15 14:15 ` Dan Carpenter
2021-02-15 14:49 ` Vladimir Oltean
2021-02-13 0:14 ` [PATCH net-next 10/12] net: mscc: ocelot: refactor ocelot_xtr_irq_handler into ocelot_xtr_poll Vladimir Oltean
2021-02-13 0:14 ` [PATCH net-next 11/12] net: dsa: felix: setup MMIO filtering rules for PTP when using tag_8021q Vladimir Oltean
2021-02-13 0:14 ` [PATCH net-next 12/12] net: dsa: tag_ocelot_8021q: add support for PTP timestamping Vladimir Oltean
2021-02-13 7:42 ` kernel test robot
2021-02-13 11:14 ` Vladimir Oltean
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