[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, 36 insertions, 0 deletions

diff --git a/drivers/net/sfc/xfp_phy.c b/drivers/net/sfc/xfp_phy.c
index 66dd5bf1eaa9..3b9f9ddbc372 100644
--- a/drivers/net/sfc/xfp_phy.c
+++ b/drivers/net/sfc/xfp_phy.c
@@ -24,6 +24,10 @@
                            MDIO_MMDREG_DEVS0_PMAPMD |   \
                            MDIO_MMDREG_DEVS0_PHYXS)
 
+#define XFP_LOOPBACKS ((1 << LOOPBACK_PCS) |            \
+                       (1 << LOOPBACK_PMAPMD) |         \
+                       (1 << LOOPBACK_NETWORK))
+
 /****************************************************************************/
 /* Quake-specific MDIO registers */
 #define MDIO_QUAKE_LED0_REG     (0xD006)
@@ -35,6 +39,10 @@ void xfp_set_led(struct efx_nic *p, int led, int mode)
                             mode);
 }
 
+struct xfp_phy_data {
+        int tx_disabled;
+};
+
 #define XFP_MAX_RESET_TIME 500
 #define XFP_RESET_WAIT 10
 
@@ -72,18 +80,31 @@ static int xfp_reset_phy(struct efx_nic *efx)
 
 static int xfp_phy_init(struct efx_nic *efx)
 {
+        struct xfp_phy_data *phy_data;
         u32 devid = mdio_clause45_read_id(efx, MDIO_MMD_PHYXS);
         int rc;
 
+        phy_data = kzalloc(sizeof(struct xfp_phy_data), GFP_KERNEL);
+        efx->phy_data = (void *) phy_data;
+
         EFX_INFO(efx, "XFP: PHY ID reg %x (OUI %x model %x revision"
                  " %x)\n", devid, MDIO_ID_OUI(devid), MDIO_ID_MODEL(devid),
                  MDIO_ID_REV(devid));
 
+        phy_data->tx_disabled = efx->tx_disabled;
+
         rc = xfp_reset_phy(efx);
 
         EFX_INFO(efx, "XFP: PHY init %s.\n",
                  rc ? "failed" : "successful");
+        if (rc < 0)
+                goto fail;
 
+        return 0;
+
+ fail:
+        kfree(efx->phy_data);
+        efx->phy_data = NULL;
         return rc;
 }
 
@@ -110,6 +131,16 @@ static int xfp_phy_check_hw(struct efx_nic *efx)
 
 static void xfp_phy_reconfigure(struct efx_nic *efx)
 {
+        struct xfp_phy_data *phy_data = efx->phy_data;
+
+        /* Reset the PHY when moving from tx off to tx on */
+        if (phy_data->tx_disabled && !efx->tx_disabled)
+                xfp_reset_phy(efx);
+
+        mdio_clause45_transmit_disable(efx);
+        mdio_clause45_phy_reconfigure(efx);
+
+        phy_data->tx_disabled = efx->tx_disabled;
         efx->link_up = xfp_link_ok(efx);
         efx->link_options = GM_LPA_10000FULL;
 }
@@ -119,6 +150,10 @@ static void xfp_phy_fini(struct efx_nic *efx)
 {
         /* Clobber the LED if it was blinking */
         efx->board_info.blink(efx, 0);
+
+        /* Free the context block */
+        kfree(efx->phy_data);
+        efx->phy_data = NULL;
 }
 
 struct efx_phy_operations falcon_xfp_phy_ops = {
@@ -129,4 +164,5 @@ struct efx_phy_operations falcon_xfp_phy_ops = {
         .clear_interrupt = xfp_phy_clear_interrupt,
         .reset_xaui      = efx_port_dummy_op_void,
         .mmds            = XFP_REQUIRED_DEVS,
+        .loopbacks       = XFP_LOOPBACKS,
 };