sfc: Implement auto-negotiation

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>

1 files changed, 32 insertions, 0 deletions

diff --git a/drivers/net/sfc/mdio_10g.h b/drivers/net/sfc/mdio_10g.h
index 4830e0c1da0b..80c63dde8864 100644
--- a/drivers/net/sfc/mdio_10g.h
+++ b/drivers/net/sfc/mdio_10g.h
@@ -81,6 +81,17 @@
 #define MDIO_MMDREG_DEVS_PHYXS  DEV_PRESENT_BIT(MDIO_MMD_PHYXS)
 #define MDIO_MMDREG_DEVS_PCS    DEV_PRESENT_BIT(MDIO_MMD_PCS)
 #define MDIO_MMDREG_DEVS_PMAPMD DEV_PRESENT_BIT(MDIO_MMD_PMAPMD)
+#define MDIO_MMDREG_DEVS_AN     DEV_PRESENT_BIT(MDIO_MMD_AN)
+
+/* Bits in MMDREG_SPEED */
+#define MDIO_MMDREG_SPEED_10G_LBN       0
+#define MDIO_MMDREG_SPEED_10G_WIDTH     1
+#define MDIO_MMDREG_SPEED_1000M_LBN     4
+#define MDIO_MMDREG_SPEED_1000M_WIDTH   1
+#define MDIO_MMDREG_SPEED_100M_LBN      5
+#define MDIO_MMDREG_SPEED_100M_WIDTH    1
+#define MDIO_MMDREG_SPEED_10M_LBN       6
+#define MDIO_MMDREG_SPEED_10M_WIDTH     1
 
 /* Bits in MMDREG_STAT2 */
 #define MDIO_MMDREG_STAT2_PRESENT_VAL   (2)
@@ -119,12 +130,20 @@
 #define MDIO_PHYXS_LANE_ALIGNED_LBN     (12)
 
 /* AN registers */
+#define MDIO_AN_CTRL_XNP_LBN            13
 #define MDIO_AN_STATUS                  (1)
 #define MDIO_AN_STATUS_XNP_LBN          (7)
 #define MDIO_AN_STATUS_PAGE_LBN         (6)
 #define MDIO_AN_STATUS_AN_DONE_LBN      (5)
 #define MDIO_AN_STATUS_LP_AN_CAP_LBN    (0)
 
+#define MDIO_AN_ADVERTISE               16
+#define MDIO_AN_ADVERTISE_XNP_LBN       12
+#define MDIO_AN_LPA                     19
+#define MDIO_AN_XNP                     22
+#define MDIO_AN_LPA_XNP                 25
+
+#define MDIO_AN_10GBT_ADVERTISE         32
 #define MDIO_AN_10GBT_STATUS            (33)
 #define MDIO_AN_10GBT_STATUS_MS_FLT_LBN (15) /* MASTER/SLAVE config fault */
 #define MDIO_AN_10GBT_STATUS_MS_LBN     (14) /* MASTER/SLAVE config */
@@ -251,10 +270,23 @@ extern void mdio_clause45_set_mmds_lpower(struct efx_nic *efx,
 extern void mdio_clause45_get_settings(struct efx_nic *efx,
                                        struct ethtool_cmd *ecmd);
 
+/* Read (some of) the PHY settings over MDIO */
+extern void
+mdio_clause45_get_settings_ext(struct efx_nic *efx, struct ethtool_cmd *ecmd,
+                               u32 xnp, u32 xnp_lpa);
+
 /* Set (some of) the PHY settings over MDIO */
 extern int mdio_clause45_set_settings(struct efx_nic *efx,
                                       struct ethtool_cmd *ecmd);
 
+/* Set pause parameters to be advertised through AN (if available) */
+extern void mdio_clause45_set_pause(struct efx_nic *efx);
+
+/* Get pause parameters from AN if available (otherwise return
+ * requested pause parameters)
+ */
+enum efx_fc_type mdio_clause45_get_pause(struct efx_nic *efx);
+
 /* Wait for specified MMDs to exit reset within a timeout */
 extern int mdio_clause45_wait_reset_mmds(struct efx_nic *efx,
                                          unsigned int mmd_mask);