sfc: Refactor link configuration

Refactor PHY, MAC and NIC configuration operations so that the
existing link configuration can be re-pushed with:

	efx->phy_op->reconfigure(efx);
	efx->mac_op->reconfigure(efx);

and a new configuration with:

	efx->nic_op->reconfigure_port(efx);

(plus locking and error-checking).

We have not held the link settings in software (aside from flow
control), and have relied on asking the hardware what they are.  This
is a problem because in some cases the hardware may no longer be in a
state to tell us.  In particular, if an entire multi-port board is
reset through one port, the driver bindings to other ports have no
chance to save settings before recovering.

We only actually need to keep track of the autonegotiation settings,
so add an ethtool advertising mask to struct efx_nic, initialise it
in PHY init and update it as necessary.

Remove now-unneeded uses of efx_phy_op::{get,set}_settings() and
struct ethtool_cmd.

Much of this was done by Steve Hodgson <shodgson@solarflare.com>.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 3 deletions

diff --git a/drivers/net/sfc/falcon_xmac.c b/drivers/net/sfc/falcon_xmac.c
index 60dc097..898afc1 100644
--- a/drivers/net/sfc/falcon_xmac.c
+++ b/drivers/net/sfc/falcon_xmac.c
@@ -112,7 +112,7 @@ static void falcon_mask_status_intr(struct efx_nic *efx, bool enable)
 }
 
 /* Get status of XAUI link */
-bool falcon_xaui_link_ok(struct efx_nic *efx)
+static bool falcon_xaui_link_ok(struct efx_nic *efx)
 {
 	efx_oword_t reg;
 	bool align_done, link_ok = false;
@@ -143,7 +143,7 @@ bool falcon_xaui_link_ok(struct efx_nic *efx)
 	return link_ok;
 }
 
-static void falcon_reconfigure_xmac_core(struct efx_nic *efx)
+void falcon_reconfigure_xmac_core(struct efx_nic *efx)
 {
 	unsigned int max_frame_len;
 	efx_oword_t reg;
@@ -275,7 +275,7 @@ static bool falcon_xmac_check_fault(struct efx_nic *efx)
 	return !falcon_check_xaui_link_up(efx, 5);
 }
 
-static void falcon_reconfigure_xmac(struct efx_nic *efx)
+static int falcon_reconfigure_xmac(struct efx_nic *efx)
 {
 	falcon_mask_status_intr(efx, false);
 
@@ -286,6 +286,8 @@ static void falcon_reconfigure_xmac(struct efx_nic *efx)
 
 	efx->xmac_poll_required = !falcon_check_xaui_link_up(efx, 5);
 	falcon_mask_status_intr(efx, true);
+
+	return 0;
 }
 
 static void falcon_update_stats_xmac(struct efx_nic *efx)