netdev - Re: am335x: cpsw: phy ignores max-speed setting

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAA93jw5=LDirktyC+rvpLi-kywUSosj6QV8-na5p3-f=PxKcWQ@mail.gmail.com>
Date:	Thu, 6 Nov 2014 08:51:09 -0800
From:	Dave Taht <dave.taht@...il.com>
To:	Yegor Yefremov <yegorslists@...glemail.com>
Cc:	netdev <netdev@...r.kernel.org>,
	"N, Mugunthan V" <mugunthanvnm@...com>, mpa@...gutronix.de,
	lsorense@...lub.uwaterloo.ca, Daniel Mack <zonque@...il.com>
Subject: Re: am335x: cpsw: phy ignores max-speed setting

ooh! ooh! I have a BQL enablement patch for the cpsw that I have no
means of testing against multiple phys. Could
you give the attached very small patch a shot along the way?

The results I get on the beaglebone vs netperf-wrapper are pretty
spectacular - huge increase in throughput, big reduction in
latency.

http://snapon.lab.bufferbloat.net/~d/beagle_bql/bql_makes_a_difference.png
http://snapon.lab.bufferbloat.net/~d/beagle_bql/beaglebonewithbql.png

On Thu, Nov 6, 2014 at 8:25 AM, Yegor Yefremov
<yegorslists@...glemail.com> wrote:
> I' m trying to override max-speed setting for both CPSW connected
> PHYs. This is my DTS section for configuring CPSW:
>
> &mac {
>         pinctrl-names = "default", "sleep";
>         pinctrl-0 = <&cpsw_default>;
>         pinctrl-1 = <&cpsw_sleep>;
>         dual_emac = <1>;
>
>         status = "okay";
> };
>
> &davinci_mdio {
>         pinctrl-names = "default", "sleep";
>         pinctrl-0 = <&davinci_mdio_default>;
>         pinctrl-1 = <&davinci_mdio_sleep>;
>
>         status = "okay";
> };
>
> &cpsw_emac0 {
>         phy_id = <&davinci_mdio>, <0>;
>         phy-mode = "rgmii-id";
>         dual_emac_res_vlan = <1>;
>         max-speed = <100>;
> };
>
> &cpsw_emac1 {
>         phy_id = <&davinci_mdio>, <1>;
>         phy-mode = "rgmii-id";
>         dual_emac_res_vlan = <2>;
>         max-speed = <100>;
> };
>
> But in drivers/net/phy/phy_device.c->of_set_phy_supported() routine I
> don't get through node check, i.e. node == NULL. Any idea why?
>
> static void of_set_phy_supported(struct phy_device *phydev)
> {
>         struct device_node *node = phydev->dev.of_node;
>         u32 max_speed;
>
>         if (!IS_ENABLED(CONFIG_OF_MDIO))
>                 return;
>
>         if (!node)
>                 return;
>
>         if (!of_property_read_u32(node, "max-speed", &max_speed)) {
>                 /* The default values for phydev->supported are
> provided by the PHY
>                  * driver "features" member, we want to reset to sane
> defaults fist
>                  * before supporting higher speeds.
>                  */
>                 phydev->supported &= PHY_DEFAULT_FEATURES;
>
>                 switch (max_speed) {
>                 default:
>                         return;
>
>                 case SPEED_1000:
>                         phydev->supported |= PHY_1000BT_FEATURES;
>                 case SPEED_100:
>                         phydev->supported |= PHY_100BT_FEATURES;
>                 case SPEED_10:
>                         phydev->supported |= PHY_10BT_FEATURES;
>                 }
>         }
> }
>
> Yegor
> --
> To unsubscribe from this list: send the line "unsubscribe netdev" in
> the body of a message to majordomo@...r.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html



-- 
Dave Täht

thttp://www.bufferbloat.net/projects/bloat/wiki/Upcoming_Talks

View attachment "0001-Add-BQL-support-to-the-TI-cpsw-driver.patch" of type "text/x-patch" (2369 bytes)