| Message ID | 20210411205511.417085-1-martin.blumenstingl@googlemail.com |
|---|---|
| State | New |
| Headers | show |
| Series | [net-next] net: dsa: lantiq_gswip: Add support for dumping the registers | expand |
On Tue, Apr 13, 2021 at 1:45 AM Andrew Lunn <andrew@lunn.ch> wrote: [...] > > > and a few people have forked it and modified it for other DSA > > > switches. At some point we might want to try to merge the forks back > > > together so we have one tool to dump any switch. > > actually I was wondering if there is some way to make the registers > > "easier to read" in userspace. > > You can add decoding to ethtool. The marvell chips have this, to some > extent. But the ethtool API is limited to just port registers, and > there can be a lot more registers which are not associated to a > port. devlink gives you access to these additional registers. oh, then that's actually also a problem with my patch: the .get_regs implementation currently also uses five registers which are not related to the specific port. noted in case I re-send this as .get_regs patch instead of moving over to devlink. Thanks for the hints as always! Martin
On 4/13/2021 12:25 PM, Martin Blumenstingl wrote: > On Tue, Apr 13, 2021 at 1:45 AM Andrew Lunn <andrew@lunn.ch> wrote: > [...] >>>> and a few people have forked it and modified it for other DSA >>>> switches. At some point we might want to try to merge the forks back >>>> together so we have one tool to dump any switch. >>> actually I was wondering if there is some way to make the registers >>> "easier to read" in userspace. >> >> You can add decoding to ethtool. The marvell chips have this, to some >> extent. But the ethtool API is limited to just port registers, and >> there can be a lot more registers which are not associated to a >> port. devlink gives you access to these additional registers. > oh, then that's actually also a problem with my patch: > the .get_regs implementation currently also uses five registers which > are not related to the specific port. > noted in case I re-send this as .get_regs patch instead of moving over > to devlink. In premise there is nothing that prevents you from returning the port registers as well as the global registers for any .get_regs() call. This is not really beautiful or clean but as far as register dumping goes it would get the job done. devlink is better organized in that you can dump global and per-port registers and they show up as separate regions. -- Florian
On 4/13/21 12:24 AM, Martin Blumenstingl wrote: > Hi Andrew, > > On Mon, Apr 12, 2021 at 1:16 AM Andrew Lunn <andrew@lunn.ch> wrote: >> >> On Sun, Apr 11, 2021 at 10:55:11PM +0200, Martin Blumenstingl wrote: >>> Add support for .get_regs_len and .get_regs so it is easier to find out >>> about the state of the ports on the GSWIP hardware. For this we >>> specifically add the GSWIP_MAC_PSTATp(port) and GSWIP_MDIO_STATp(port) >>> register #defines as these contain the current port status (as well as >>> the result of the auto polling mechanism). Other global and per-port >>> registers which are also considered useful are included as well. >> >> Although this is O.K, there has been a trend towards using devlink >> regions for this, and other register sets in the switch. Take a look >> at drivers/net/dsa/mv88e6xxx/devlink.c. >> >> There is a userspace tool for the mv88e6xxx devlink regions here: >> >> https://github.com/lunn/mv88e6xxx_dump >> >> and a few people have forked it and modified it for other DSA >> switches. At some point we might want to try to merge the forks back >> together so we have one tool to dump any switch. > actually I was wondering if there is some way to make the registers > "easier to read" in userspace. > It turns out there is :-) > > Hauke, which approach do you recommend?: > - update this patch with your suggestion and ask Andrew to still merge > it soon-ish > - put this topic somewhere on my or your TODO-list and come up with a > devlink solution at some point in the future Would you work on the devlink solution in the next weeks? I think this is part of the ABI when we add it, can we later remove the ethtool registers when we add devlink support or is this not allowed? Hauke
diff --git a/drivers/net/dsa/lantiq_gswip.c b/drivers/net/dsa/lantiq_gswip.c index 314ae78bbdd6..d3cfc72644ff 100644 --- a/drivers/net/dsa/lantiq_gswip.c +++ b/drivers/net/dsa/lantiq_gswip.c @@ -90,6 +90,21 @@ GSWIP_MDIO_PHY_LINK_MASK | \ GSWIP_MDIO_PHY_SPEED_MASK | \ GSWIP_MDIO_PHY_FDUP_MASK) +#define GSWIP_MDIO_STATp(p) (0x16 + (p)) +#define GSWIP_MDIO_STAT_RXACT BIT(10) +#define GSWIP_MDIO_STAT_TXACT BIT(9) +#define GSWIP_MDIO_STAT_CLK_STOP_CAPAB BIT(8) +#define GSWIP_MDIO_STAT_EEE_CAPABLE BIT(7) +#define GSWIP_MDIO_STAT_PACT BIT(6) +#define GSWIP_MDIO_STAT_LSTAT BIT(5) +#define GSWIP_MDIO_STAT_SPEED_M10 0x00 +#define GSWIP_MDIO_STAT_SPEED_M100 0x08 +#define GSWIP_MDIO_STAT_SPEED_1G 0x10 +#define GSWIP_MDIO_STAT_SPEED_RESERVED 0x18 +#define GSWIP_MDIO_STAT_SPEED_MASK 0x18 +#define GSWIP_MDIO_STAT_FDUP BIT(2) +#define GSWIP_MDIO_STAT_RXPAUEN BIT(1) +#define GSWIP_MDIO_STAT_TXPAUEN BIT(0) /* GSWIP MII Registers */ #define GSWIP_MII_CFGp(p) (0x2 * (p)) @@ -195,6 +210,19 @@ #define GSWIP_PCE_DEFPVID(p) (0x486 + ((p) * 0xA)) #define GSWIP_MAC_FLEN 0x8C5 +#define GSWIP_MAC_PSTATp(p) (0x900 + ((p) * 0xC)) +#define GSWIP_MAC_PSTAT_PACT BIT(11) +#define GSWIP_MAC_PSTAT_GBIT BIT(10) +#define GSWIP_MAC_PSTAT_MBIT BIT(9) +#define GSWIP_MAC_PSTAT_FDUP BIT(8) +#define GSWIP_MAC_PSTAT_RXPAU BIT(7) +#define GSWIP_MAC_PSTAT_TXPAU BIT(6) +#define GSWIP_MAC_PSTAT_RXPAUEN BIT(5) +#define GSWIP_MAC_PSTAT_TXPAUEN BIT(4) +#define GSWIP_MAC_PSTAT_LSTAT BIT(3) +#define GSWIP_MAC_PSTAT_CRS BIT(2) +#define GSWIP_MAC_PSTAT_TXLPI BIT(1) +#define GSWIP_MAC_PSTAT_RXLPI BIT(0) #define GSWIP_MAC_CTRL_0p(p) (0x903 + ((p) * 0xC)) #define GSWIP_MAC_CTRL_0_PADEN BIT(8) #define GSWIP_MAC_CTRL_0_FCS_EN BIT(7) @@ -701,6 +729,57 @@ static void gswip_port_disable(struct dsa_switch *ds, int port) GSWIP_SDMA_PCTRLp(port)); } +static int gswip_get_regs_len(struct dsa_switch *ds, int port) +{ + return 17 * sizeof(u32); +} + +static void gswip_get_regs(struct dsa_switch *ds, int port, + struct ethtool_regs *regs, void *_p) +{ + struct gswip_priv *priv = ds->priv; + u32 *p = _p; + + regs->version = gswip_switch_r(priv, GSWIP_VERSION); + + memset(p, 0xff, 17 * sizeof(u32)); + + p[0] = gswip_mdio_r(priv, GSWIP_MDIO_GLOB); + p[1] = gswip_mdio_r(priv, GSWIP_MDIO_CTRL); + p[2] = gswip_mdio_r(priv, GSWIP_MDIO_MDC_CFG0); + p[3] = gswip_mdio_r(priv, GSWIP_MDIO_MDC_CFG1); + + if (!dsa_is_cpu_port(priv->ds, port)) { + p[4] = gswip_mdio_r(priv, GSWIP_MDIO_PHYp(port)); + p[5] = gswip_mdio_r(priv, GSWIP_MDIO_STATp(port)); + p[6] = gswip_mii_r(priv, GSWIP_MII_CFGp(port)); + } + + switch (port) { + case 0: + p[7] = gswip_mii_r(priv, GSWIP_MII_PCDU0); + break; + case 1: + p[7] = gswip_mii_r(priv, GSWIP_MII_PCDU1); + break; + case 5: + p[7] = gswip_mii_r(priv, GSWIP_MII_PCDU5); + break; + default: + break; + } + + p[8] = gswip_switch_r(priv, GSWIP_PCE_PCTRL_0p(port)); + p[9] = gswip_switch_r(priv, GSWIP_PCE_VCTRL(port)); + p[10] = gswip_switch_r(priv, GSWIP_PCE_DEFPVID(port)); + p[11] = gswip_switch_r(priv, GSWIP_MAC_FLEN); + p[12] = gswip_switch_r(priv, GSWIP_MAC_PSTATp(port)); + p[13] = gswip_switch_r(priv, GSWIP_MAC_CTRL_0p(port)); + p[14] = gswip_switch_r(priv, GSWIP_MAC_CTRL_2p(port)); + p[15] = gswip_switch_r(priv, GSWIP_FDMA_PCTRLp(port)); + p[16] = gswip_switch_r(priv, GSWIP_SDMA_PCTRLp(port)); +} + static int gswip_pce_load_microcode(struct gswip_priv *priv) { int i; @@ -1795,6 +1874,8 @@ static const struct dsa_switch_ops gswip_xrx200_switch_ops = { .setup = gswip_setup, .port_enable = gswip_port_enable, .port_disable = gswip_port_disable, + .get_regs_len = gswip_get_regs_len, + .get_regs = gswip_get_regs, .port_bridge_join = gswip_port_bridge_join, .port_bridge_leave = gswip_port_bridge_leave, .port_fast_age = gswip_port_fast_age, @@ -1819,6 +1900,8 @@ static const struct dsa_switch_ops gswip_xrx300_switch_ops = { .setup = gswip_setup, .port_enable = gswip_port_enable, .port_disable = gswip_port_disable, + .get_regs_len = gswip_get_regs_len, + .get_regs = gswip_get_regs, .port_bridge_join = gswip_port_bridge_join, .port_bridge_leave = gswip_port_bridge_leave, .port_fast_age = gswip_port_fast_age,