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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
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57
drivers/net/sfc/ethtool.c
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@@ -12,11 +12,13 @@
#include <linux/ethtool.h>
#include <linux/rtnetlink.h>
#include "net_driver.h"
#include "workarounds.h"
#include "selftest.h"
#include "efx.h"
#include "ethtool.h"
#include "falcon.h"
#include "spi.h"
#include "mdio_10g.h"
const char *efx_loopback_mode_names[] = {
[LOOPBACK_NONE] = "NONE",
@@ -674,14 +676,51 @@ static int efx_ethtool_set_pauseparam(struct net_device *net_dev,
struct ethtool_pauseparam *pause)
{
struct efx_nic *efx = netdev_priv(net_dev);
enum efx_fc_type flow_control = efx->flow_control;
enum efx_fc_type wanted_fc;
bool reset;
flow_control &= ~(EFX_FC_RX | EFX_FC_TX | EFX_FC_AUTO);
flow_control |= pause->rx_pause ? EFX_FC_RX : 0;
flow_control |= pause->tx_pause ? EFX_FC_TX : 0;
flow_control |= pause->autoneg ? EFX_FC_AUTO : 0;
wanted_fc = ((pause->rx_pause ? EFX_FC_RX : 0) |
(pause->tx_pause ? EFX_FC_TX : 0) |
(pause->autoneg ? EFX_FC_AUTO : 0));
if ((wanted_fc & EFX_FC_TX) && !(wanted_fc & EFX_FC_RX)) {
EFX_LOG(efx, "Flow control unsupported: tx ON rx OFF\n");
return -EINVAL;
}
if (!(efx->phy_op->mmds & DEV_PRESENT_BIT(MDIO_MMD_AN)) &&
(wanted_fc & EFX_FC_AUTO)) {
EFX_LOG(efx, "PHY does not support flow control "
"autonegotiation\n");
return -EINVAL;
}
/* TX flow control may automatically turn itself off if the
* link partner (intermittently) stops responding to pause
* frames. There isn't any indication that this has happened,
* so the best we do is leave it up to the user to spot this
* and fix it be cycling transmit flow control on this end. */
reset = (wanted_fc & EFX_FC_TX) && !(efx->wanted_fc & EFX_FC_TX);
if (EFX_WORKAROUND_11482(efx) && reset) {
if (falcon_rev(efx) >= FALCON_REV_B0) {
/* Recover by resetting the EM block */
if (efx->link_up)
falcon_drain_tx_fifo(efx);
} else {
/* Schedule a reset to recover */
efx_schedule_reset(efx, RESET_TYPE_INVISIBLE);
}
}
/* Try to push the pause parameters */
mutex_lock(&efx->mac_lock);
efx->wanted_fc = wanted_fc;
mdio_clause45_set_pause(efx);
__efx_reconfigure_port(efx);
mutex_unlock(&efx->mac_lock);
efx_reconfigure_port(efx);
return 0;
}
@@ -690,9 +729,9 @@ static void efx_ethtool_get_pauseparam(struct net_device *net_dev,
{
struct efx_nic *efx = netdev_priv(net_dev);
pause->rx_pause = !!(efx->flow_control & EFX_FC_RX);
pause->tx_pause = !!(efx->flow_control & EFX_FC_TX);
pause->autoneg = !!(efx->flow_control & EFX_FC_AUTO);
pause->rx_pause = !!(efx->wanted_fc & EFX_FC_RX);
pause->tx_pause = !!(efx->wanted_fc & EFX_FC_TX);
pause->autoneg = !!(efx->wanted_fc & EFX_FC_AUTO);
}