[netdrvr] sfc: sfc: Add self-test support

Add a set of self-tests accessible thorugh ethtool.
Add hardware loopback and TX disable control code to support them.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

1 files changed, 78 insertions, 0 deletions

diff --git a/drivers/net/sfc/mdio_10g.c b/drivers/net/sfc/mdio_10g.c
index dc06bb0aa575..c4f540e93b79 100644
--- a/drivers/net/sfc/mdio_10g.c
+++ b/drivers/net/sfc/mdio_10g.c
@@ -44,6 +44,9 @@ static int mdio_clause45_check_mmd(struct efx_nic *efx, int mmd,
         int status;
         int phy_id = efx->mii.phy_id;
 
+        if (LOOPBACK_INTERNAL(efx))
+                return 0;
+
         /* Read MMD STATUS2 to check it is responding. */
         status = mdio_clause45_read(efx, phy_id, mmd, MDIO_MMDREG_STAT2);
         if (((status >> MDIO_MMDREG_STAT2_PRESENT_LBN) &
@@ -164,6 +167,22 @@ int mdio_clause45_links_ok(struct efx_nic *efx, unsigned int mmd_mask)
         int mmd = 0;
         int good;
 
+        /* If the port is in loopback, then we should only consider a subset
+         * of mmd's */
+        if (LOOPBACK_INTERNAL(efx))
+                return 1;
+        else if (efx->loopback_mode == LOOPBACK_NETWORK)
+                return 0;
+        else if (efx->loopback_mode == LOOPBACK_PHYXS)
+                mmd_mask &= ~(MDIO_MMDREG_DEVS0_PHYXS |
+                              MDIO_MMDREG_DEVS0_PCS |
+                              MDIO_MMDREG_DEVS0_PMAPMD);
+        else if (efx->loopback_mode == LOOPBACK_PCS)
+                mmd_mask &= ~(MDIO_MMDREG_DEVS0_PCS |
+                              MDIO_MMDREG_DEVS0_PMAPMD);
+        else if (efx->loopback_mode == LOOPBACK_PMAPMD)
+                mmd_mask &= ~MDIO_MMDREG_DEVS0_PMAPMD;
+
         while (mmd_mask) {
                 if (mmd_mask & 1) {
                         /* Double reads because link state is latched, and a
@@ -182,6 +201,65 @@ int mdio_clause45_links_ok(struct efx_nic *efx, unsigned int mmd_mask)
         return ok;
 }
 
+void mdio_clause45_transmit_disable(struct efx_nic *efx)
+{
+        int phy_id = efx->mii.phy_id;
+        int ctrl1, ctrl2;
+
+        ctrl1 = ctrl2 = mdio_clause45_read(efx, phy_id, MDIO_MMD_PMAPMD,
+                                           MDIO_MMDREG_TXDIS);
+        if (efx->tx_disabled)
+                ctrl2 |= (1 << MDIO_MMDREG_TXDIS_GLOBAL_LBN);
+        else
+                ctrl1 &= ~(1 << MDIO_MMDREG_TXDIS_GLOBAL_LBN);
+        if (ctrl1 != ctrl2)
+                mdio_clause45_write(efx, phy_id, MDIO_MMD_PMAPMD,
+                                    MDIO_MMDREG_TXDIS, ctrl2);
+}
+
+void mdio_clause45_phy_reconfigure(struct efx_nic *efx)
+{
+        int phy_id = efx->mii.phy_id;
+        int ctrl1, ctrl2;
+
+        /* Handle (with debouncing) PMA/PMD loopback */
+        ctrl1 = ctrl2 = mdio_clause45_read(efx, phy_id, MDIO_MMD_PMAPMD,
+                                           MDIO_MMDREG_CTRL1);
+
+        if (efx->loopback_mode == LOOPBACK_PMAPMD)
+                ctrl2 |= (1 << MDIO_PMAPMD_CTRL1_LBACK_LBN);
+        else
+                ctrl2 &= ~(1 << MDIO_PMAPMD_CTRL1_LBACK_LBN);
+
+        if (ctrl1 != ctrl2)
+                mdio_clause45_write(efx, phy_id, MDIO_MMD_PMAPMD,
+                                    MDIO_MMDREG_CTRL1, ctrl2);
+
+        /* Handle (with debouncing) PCS loopback */
+        ctrl1 = ctrl2 = mdio_clause45_read(efx, phy_id, MDIO_MMD_PCS,
+                                           MDIO_MMDREG_CTRL1);
+        if (efx->loopback_mode == LOOPBACK_PCS)
+                ctrl2 |= (1 << MDIO_MMDREG_CTRL1_LBACK_LBN);
+        else
+                ctrl2 &= ~(1 << MDIO_MMDREG_CTRL1_LBACK_LBN);
+
+        if (ctrl1 != ctrl2)
+                mdio_clause45_write(efx, phy_id, MDIO_MMD_PCS,
+                                    MDIO_MMDREG_CTRL1, ctrl2);
+
+        /* Handle (with debouncing) PHYXS network loopback */
+        ctrl1 = ctrl2 = mdio_clause45_read(efx, phy_id, MDIO_MMD_PHYXS,
+                                           MDIO_MMDREG_CTRL1);
+        if (efx->loopback_mode == LOOPBACK_NETWORK)
+                ctrl2 |= (1 << MDIO_MMDREG_CTRL1_LBACK_LBN);
+        else
+                ctrl2 &= ~(1 << MDIO_MMDREG_CTRL1_LBACK_LBN);
+
+        if (ctrl1 != ctrl2)
+                mdio_clause45_write(efx, phy_id, MDIO_MMD_PHYXS,
+                                    MDIO_MMDREG_CTRL1, ctrl2);
+}
+
 /**
  * mdio_clause45_get_settings - Read (some of) the PHY settings over MDIO.
  * @efx:                Efx NIC