From: Adrien Mazarguil <adrien.mazarguil@6wind.com>
To: Ophir Munk <ophirmu@mellanox.com>
Cc: dev@dpdk.org, Thomas Monjalon <thomas@monjalon.net>,
Olga Shern <olgas@mellanox.com>,
stable@dpdk.org
Subject: Re: [dpdk-dev] [PATCH v1] net/mlx4: fix single port configuration
Date: Fri, 26 Jan 2018 17:44:01 +0100 [thread overview]
Message-ID: <20180126164401.GY4256@6wind.com> (raw)
In-Reply-To: <1516750367-26610-1-git-send-email-ophirmu@mellanox.com>
Hi Ophir,
On Tue, Jan 23, 2018 at 11:32:47PM +0000, Ophir Munk wrote:
> The number of mlx4 present ports is calculated as follows:
> conf.ports.present |= (UINT64_C(1) << device_attr.phys_port_cnt) - 1;
>
> That is - all ones sequence (due to -1 subtraction)
> When retrieving the number of ports, 1 must be added in order to obtain
> the correct number of ports to the power of 2, as follows:
> uint32_t ports = rte_log2_u32(conf->ports.present + 1);
> If 1 was not added, in the case of one port, the number of ports would
> be falsely calculated as 0.
>
> Fixes: 82642799 ("net/mlx4: check max number of ports dynamically")
> Cc: stable@dpdk.org
>
> Signed-off-by: Ophir Munk <ophirmu@mellanox.com>
I was too busy to reply earlier, thanks for taking care of this issue.
Acked-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>
--
Adrien Mazarguil
6WIND
next prev parent reply other threads:[~2018-01-26 16:44 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-23 23:32 Ophir Munk
2018-01-26 16:44 ` Adrien Mazarguil [this message]
2018-01-28 7:22 ` [dpdk-dev] [dpdk-stable] " Shahaf Shuler
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