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Message-ID: <67198e21-a679-b059-3eed-e579ada05a78@solarflare.com>
Date: Mon, 7 Sep 2020 17:15:08 +0100
From: Edward Cree <ecree@...arflare.com>
To: <linux-net-drivers@...arflare.com>, <davem@...emloft.net>
CC: <netdev@...r.kernel.org>
Subject: [PATCH net-next 4/6] sfc: handle limited FEC support
If the reported PHY capabilities do not include a given FEC mode, don't
attempt to select that FEC mode anyway. If the user tries to set a mode
through ethtool that is not supported, return an error.
The _REQUESTED bits don't appear in the supported caps, but are implied
by the corresponding FEC bits.
Signed-off-by: Edward Cree <ecree@...arflare.com>
---
drivers/net/ethernet/sfc/mcdi_port_common.c | 48 +++++++++++++++------
drivers/net/ethernet/sfc/mcdi_port_common.h | 2 +-
2 files changed, 36 insertions(+), 14 deletions(-)
diff --git a/drivers/net/ethernet/sfc/mcdi_port_common.c b/drivers/net/ethernet/sfc/mcdi_port_common.c
index 71c76a6a6b0e..c0e1c88a652c 100644
--- a/drivers/net/ethernet/sfc/mcdi_port_common.c
+++ b/drivers/net/ethernet/sfc/mcdi_port_common.c
@@ -308,7 +308,7 @@ void efx_mcdi_phy_decode_link(struct efx_nic *efx,
* Both RS and BASER (whether AUTO or not) means use FEC if cable and link
* partner support it, preferring RS to BASER.
*/
-u32 ethtool_fec_caps_to_mcdi(u32 ethtool_cap)
+u32 ethtool_fec_caps_to_mcdi(u32 supported_cap, u32 ethtool_cap)
{
u32 ret = 0;
@@ -316,17 +316,21 @@ u32 ethtool_fec_caps_to_mcdi(u32 ethtool_cap)
return 0;
if (ethtool_cap & ETHTOOL_FEC_AUTO)
- ret |= (1 << MC_CMD_PHY_CAP_BASER_FEC_LBN) |
- (1 << MC_CMD_PHY_CAP_25G_BASER_FEC_LBN) |
- (1 << MC_CMD_PHY_CAP_RS_FEC_LBN);
- if (ethtool_cap & ETHTOOL_FEC_RS)
+ ret |= ((1 << MC_CMD_PHY_CAP_BASER_FEC_LBN) |
+ (1 << MC_CMD_PHY_CAP_25G_BASER_FEC_LBN) |
+ (1 << MC_CMD_PHY_CAP_RS_FEC_LBN)) & supported_cap;
+ if (ethtool_cap & ETHTOOL_FEC_RS &&
+ supported_cap & (1 << MC_CMD_PHY_CAP_RS_FEC_LBN))
ret |= (1 << MC_CMD_PHY_CAP_RS_FEC_LBN) |
(1 << MC_CMD_PHY_CAP_RS_FEC_REQUESTED_LBN);
- if (ethtool_cap & ETHTOOL_FEC_BASER)
- ret |= (1 << MC_CMD_PHY_CAP_BASER_FEC_LBN) |
- (1 << MC_CMD_PHY_CAP_25G_BASER_FEC_LBN) |
- (1 << MC_CMD_PHY_CAP_BASER_FEC_REQUESTED_LBN) |
- (1 << MC_CMD_PHY_CAP_25G_BASER_FEC_REQUESTED_LBN);
+ if (ethtool_cap & ETHTOOL_FEC_BASER) {
+ if (supported_cap & (1 << MC_CMD_PHY_CAP_BASER_FEC_LBN))
+ ret |= (1 << MC_CMD_PHY_CAP_BASER_FEC_LBN) |
+ (1 << MC_CMD_PHY_CAP_BASER_FEC_REQUESTED_LBN);
+ if (supported_cap & (1 << MC_CMD_PHY_CAP_25G_BASER_FEC_LBN))
+ ret |= (1 << MC_CMD_PHY_CAP_25G_BASER_FEC_LBN) |
+ (1 << MC_CMD_PHY_CAP_25G_BASER_FEC_REQUESTED_LBN);
+ }
return ret;
}
@@ -577,7 +581,7 @@ int efx_mcdi_phy_set_link_ksettings(struct efx_nic *efx, const struct ethtool_li
}
}
- caps |= ethtool_fec_caps_to_mcdi(efx->fec_config);
+ caps |= ethtool_fec_caps_to_mcdi(phy_cfg->supported_cap, efx->fec_config);
rc = efx_mcdi_set_link(efx, caps, efx_get_mcdi_phy_flags(efx),
efx->loopback_mode, 0);
@@ -645,12 +649,30 @@ int efx_mcdi_phy_get_fecparam(struct efx_nic *efx, struct ethtool_fecparam *fec)
return 0;
}
+/* Basic validation to ensure that the caps we are going to attempt to set are
+ * in fact supported by the adapter. Note that 'no FEC' is always supported.
+ */
+static int ethtool_fec_supported(u32 supported_cap, u32 ethtool_cap)
+{
+ if (ethtool_cap & ETHTOOL_FEC_OFF)
+ return 0;
+
+ if (ethtool_cap &&
+ !ethtool_fec_caps_to_mcdi(supported_cap, ethtool_cap))
+ return -EINVAL;
+ return 0;
+}
+
int efx_mcdi_phy_set_fecparam(struct efx_nic *efx, const struct ethtool_fecparam *fec)
{
struct efx_mcdi_phy_data *phy_cfg = efx->phy_data;
u32 caps;
int rc;
+ rc = ethtool_fec_supported(phy_cfg->supported_cap, fec->fec);
+ if (rc)
+ return rc;
+
/* Work out what efx_mcdi_phy_set_link_ksettings() would produce from
* saved advertising bits
*/
@@ -660,7 +682,7 @@ int efx_mcdi_phy_set_fecparam(struct efx_nic *efx, const struct ethtool_fecparam
else
caps = phy_cfg->forced_cap;
- caps |= ethtool_fec_caps_to_mcdi(fec->fec);
+ caps |= ethtool_fec_caps_to_mcdi(phy_cfg->supported_cap, fec->fec);
rc = efx_mcdi_set_link(efx, caps, efx_get_mcdi_phy_flags(efx),
efx->loopback_mode, 0);
if (rc)
@@ -699,7 +721,7 @@ int efx_mcdi_port_reconfigure(struct efx_nic *efx)
ethtool_linkset_to_mcdi_cap(efx->link_advertising) :
phy_cfg->forced_cap);
- caps |= ethtool_fec_caps_to_mcdi(efx->fec_config);
+ caps |= ethtool_fec_caps_to_mcdi(phy_cfg->supported_cap, efx->fec_config);
return efx_mcdi_set_link(efx, caps, efx_get_mcdi_phy_flags(efx),
efx->loopback_mode, 0);
diff --git a/drivers/net/ethernet/sfc/mcdi_port_common.h b/drivers/net/ethernet/sfc/mcdi_port_common.h
index 9d214079f699..f37e18adbc37 100644
--- a/drivers/net/ethernet/sfc/mcdi_port_common.h
+++ b/drivers/net/ethernet/sfc/mcdi_port_common.h
@@ -41,7 +41,7 @@ u8 mcdi_to_ethtool_media(u32 media);
void efx_mcdi_phy_decode_link(struct efx_nic *efx,
struct efx_link_state *link_state,
u32 speed, u32 flags, u32 fcntl);
-u32 ethtool_fec_caps_to_mcdi(u32 ethtool_cap);
+u32 ethtool_fec_caps_to_mcdi(u32 supported_cap, u32 ethtool_cap);
u32 mcdi_fec_caps_to_ethtool(u32 caps, bool is_25g);
void efx_mcdi_phy_check_fcntl(struct efx_nic *efx, u32 lpa);
bool efx_mcdi_phy_poll(struct efx_nic *efx);
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