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sfc: Implement auto-negotiation

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Add infrastructure for auto-negotiation of speed, duplex and flow
control.

When using 10Xpress, auto-negotiate flow control.  While we're
at it, clean up the code to warn when partner is not 10GBASE-T
capable.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ben Hutchings
2008-12-12 21:50:46 -08:00
committed by David S. Miller
parent 177dfcd80f
commit 04cc8cacb0
9 changed files with 479 additions and 161 deletions
Download Patch File Download Diff File Expand all files Collapse all files

138
drivers/net/sfc/tenxpress.c
View File

@@ -17,10 +17,10 @@
#include "boards.h"
/* We expect these MMDs to be in the package */
/* AN not here as mdio_check_mmds() requires STAT2 support */
#define TENXPRESS_REQUIRED_DEVS (MDIO_MMDREG_DEVS_PMAPMD | \
MDIO_MMDREG_DEVS_PCS | \
MDIO_MMDREG_DEVS_PHYXS)
MDIO_MMDREG_DEVS_PHYXS | \
MDIO_MMDREG_DEVS_AN)
#define TENXPRESS_LOOPBACKS ((1 << LOOPBACK_PHYXS) | \
(1 << LOOPBACK_PCS) | \
@@ -57,6 +57,7 @@
#define PMA_PMD_LED_ON (1)
#define PMA_PMD_LED_OFF (2)
#define PMA_PMD_LED_FLASH (3)
#define PMA_PMD_LED_MASK 3
/* All LEDs under hardware control */
#define PMA_PMD_LED_FULL_AUTO (0)
/* Green and Amber under hardware control, Red off */
@@ -242,78 +243,60 @@ unlock:
return rc;
}
static void tenxpress_set_bad_lp(struct efx_nic *efx, bool bad_lp)
static void tenxpress_check_bad_lp(struct efx_nic *efx, bool link_ok)
{
struct tenxpress_phy_data *pd = efx->phy_data;
int phy_id = efx->mii.phy_id;
bool bad_lp;
int reg;
if (link_ok) {
bad_lp = false;
} else {
/* Check that AN has started but not completed. */
reg = mdio_clause45_read(efx, phy_id, MDIO_MMD_AN,
MDIO_AN_STATUS);
if (!(reg & (1 << MDIO_AN_STATUS_LP_AN_CAP_LBN)))
return; /* LP status is unknown */
bad_lp = !(reg & (1 << MDIO_AN_STATUS_AN_DONE_LBN));
if (bad_lp)
pd->bad_lp_tries++;
}
/* Nothing to do if all is well and was previously so. */
if (!(bad_lp || pd->bad_lp_tries))
if (!pd->bad_lp_tries)
return;
reg = mdio_clause45_read(efx, efx->mii.phy_id,
MDIO_MMD_PMAPMD, PMA_PMD_LED_OVERR_REG);
if (bad_lp)
pd->bad_lp_tries++;
else
pd->bad_lp_tries = 0;
if (pd->bad_lp_tries == MAX_BAD_LP_TRIES) {
pd->bad_lp_tries = 0; /* Restart count */
reg &= ~(PMA_PMD_LED_FLASH << PMA_PMD_LED_RX_LBN);
reg |= (PMA_PMD_LED_FLASH << PMA_PMD_LED_RX_LBN);
EFX_ERR(efx, "This NIC appears to be plugged into"
" a port that is not 10GBASE-T capable.\n"
" This PHY is 10GBASE-T ONLY, so no link can"
" be established.\n");
} else {
reg |= (PMA_PMD_LED_OFF << PMA_PMD_LED_RX_LBN);
/* Use the RX (red) LED as an error indicator once we've seen AN
* failure several times in a row, and also log a message. */
if (!bad_lp || pd->bad_lp_tries == MAX_BAD_LP_TRIES) {
reg = mdio_clause45_read(efx, phy_id, MDIO_MMD_PMAPMD,
PMA_PMD_LED_OVERR_REG);
reg &= ~(PMA_PMD_LED_MASK << PMA_PMD_LED_RX_LBN);
if (!bad_lp) {
reg |= PMA_PMD_LED_OFF << PMA_PMD_LED_RX_LBN;
} else {
reg |= PMA_PMD_LED_FLASH << PMA_PMD_LED_RX_LBN;
EFX_ERR(efx, "appears to be plugged into a port"
" that is not 10GBASE-T capable. The PHY"
" supports 10GBASE-T ONLY, so no link can"
" be established\n");
}
mdio_clause45_write(efx, phy_id, MDIO_MMD_PMAPMD,
PMA_PMD_LED_OVERR_REG, reg);
pd->bad_lp_tries = bad_lp;
}
mdio_clause45_write(efx, efx->mii.phy_id, MDIO_MMD_PMAPMD,
PMA_PMD_LED_OVERR_REG, reg);
}
/* Check link status and return a boolean OK value. If the link is NOT
* OK we have a quick rummage round to see if we appear to be plugged
* into a non-10GBT port and if so warn the user that they won't get
* link any time soon as we are 10GBT only, unless caller specified
* not to do this check (it isn't useful in loopback) */
static bool tenxpress_link_ok(struct efx_nic *efx, bool check_lp)
static bool tenxpress_link_ok(struct efx_nic *efx)
{
bool ok = mdio_clause45_links_ok(efx, TENXPRESS_REQUIRED_DEVS);
if (ok) {
tenxpress_set_bad_lp(efx, false);
} else if (check_lp) {
/* Are we plugged into the wrong sort of link? */
bool bad_lp = false;
int phy_id = efx->mii.phy_id;
int an_stat = mdio_clause45_read(efx, phy_id, MDIO_MMD_AN,
MDIO_AN_STATUS);
int xphy_stat = mdio_clause45_read(efx, phy_id,
MDIO_MMD_PMAPMD,
PMA_PMD_XSTATUS_REG);
/* Are we plugged into anything that sends FLPs? If
* not we can't distinguish between not being plugged
* in and being plugged into a non-AN antique. The FLP
* bit has the advantage of not clearing when autoneg
* restarts. */
if (!(xphy_stat & (1 << PMA_PMD_XSTAT_FLP_LBN))) {
tenxpress_set_bad_lp(efx, false);
return ok;
}
/* If it can do 10GBT it must be XNP capable */
bad_lp = !(an_stat & (1 << MDIO_AN_STATUS_XNP_LBN));
if (!bad_lp && (an_stat & (1 << MDIO_AN_STATUS_PAGE_LBN))) {
bad_lp = !(mdio_clause45_read(efx, phy_id,
MDIO_MMD_AN, MDIO_AN_10GBT_STATUS) &
(1 << MDIO_AN_10GBT_STATUS_LP_10G_LBN));
}
tenxpress_set_bad_lp(efx, bad_lp);
}
return ok;
if (efx->loopback_mode == LOOPBACK_NONE)
return mdio_clause45_links_ok(efx, MDIO_MMDREG_DEVS_AN);
else
return mdio_clause45_links_ok(efx,
MDIO_MMDREG_DEVS_PMAPMD |
MDIO_MMDREG_DEVS_PCS |
MDIO_MMDREG_DEVS_PHYXS);
}
static void tenxpress_phyxs_loopback(struct efx_nic *efx)
@@ -359,9 +342,10 @@ static void tenxpress_phy_reconfigure(struct efx_nic *efx)
phy_data->loopback_mode = efx->loopback_mode;
phy_data->phy_mode = efx->phy_mode;
efx->link_up = tenxpress_link_ok(efx, false);
efx->link_up = tenxpress_link_ok(efx);
efx->link_speed = 10000;
efx->link_fd = true;
efx->link_fc = mdio_clause45_get_pause(efx);
}
static void tenxpress_phy_clear_interrupt(struct efx_nic *efx)
@@ -377,7 +361,8 @@ static int tenxpress_phy_check_hw(struct efx_nic *efx)
bool link_ok;
int rc = 0;
link_ok = tenxpress_link_ok(efx, true);
link_ok = tenxpress_link_ok(efx);
tenxpress_check_bad_lp(efx, link_ok);
if (link_ok != efx->link_up)
falcon_sim_phy_event(efx);
@@ -451,6 +436,27 @@ static int tenxpress_phy_test(struct efx_nic *efx)
return tenxpress_special_reset(efx);
}
static u32 tenxpress_get_xnp_lpa(struct efx_nic *efx)
{
int phy = efx->mii.phy_id;
u32 lpa = 0;
int reg;
reg = mdio_clause45_read(efx, phy, MDIO_MMD_AN, MDIO_AN_10GBT_STATUS);
if (reg & (1 << MDIO_AN_10GBT_STATUS_LP_10G_LBN))
lpa |= ADVERTISED_10000baseT_Full;
return lpa;
}
static void
tenxpress_get_settings(struct efx_nic *efx, struct ethtool_cmd *ecmd)
{
mdio_clause45_get_settings_ext(efx, ecmd, ADVERTISED_10000baseT_Full,
tenxpress_get_xnp_lpa(efx));
ecmd->supported |= SUPPORTED_10000baseT_Full;
ecmd->advertising |= ADVERTISED_10000baseT_Full;
}
struct efx_phy_operations falcon_tenxpress_phy_ops = {
.macs = EFX_XMAC,
.init = tenxpress_phy_init,
@@ -459,7 +465,7 @@ struct efx_phy_operations falcon_tenxpress_phy_ops = {
.fini = tenxpress_phy_fini,
.clear_interrupt = tenxpress_phy_clear_interrupt,
.test = tenxpress_phy_test,
.get_settings = mdio_clause45_get_settings,
.get_settings = tenxpress_get_settings,
.set_settings = mdio_clause45_set_settings,
.mmds = TENXPRESS_REQUIRED_DEVS,
.loopbacks = TENXPRESS_LOOPBACKS,