sfc: Clean up validation of datapath capabilities

Rename efx_ef10_init_capabilities() to the more specific
efx_ef10_init_datapath_caps().

Stop accepting short responses to MC_CMD_GET_CAPABILITIES; we
don't need to support pre-production firmware.

Move the check for RX prefix support from efx_ef10_probe() into
efx_ef10_init_datapath_caps() and use consistent error messages
for missing TSO support and missing RX prefix support.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>

1 files changed, 22 insertions, 19 deletions

diff --git a/drivers/net/ethernet/sfc/ef10.c b/drivers/net/ethernet/sfc/ef10.c
index 80a6eea49e36..a4956b86d145 100644
--- a/drivers/net/ethernet/sfc/ef10.c
+++ b/drivers/net/ethernet/sfc/ef10.c
@@ -94,7 +94,7 @@ static unsigned int efx_ef10_mem_map_size(struct efx_nic *efx)
         return resource_size(&efx->pci_dev->resource[EFX_MEM_BAR]);
 }
 
-static int efx_ef10_init_capabilities(struct efx_nic *efx)
+static int efx_ef10_init_datapath_caps(struct efx_nic *efx)
 {
         MCDI_DECLARE_BUF(outbuf, MC_CMD_GET_CAPABILITIES_OUT_LEN);
         struct efx_ef10_nic_data *nic_data = efx->nic_data;
@@ -107,16 +107,27 @@ static int efx_ef10_init_capabilities(struct efx_nic *efx)
                           outbuf, sizeof(outbuf), &outlen);
         if (rc)
                 return rc;
+        if (outlen < sizeof(outbuf)) {
+                netif_err(efx, drv, efx->net_dev,
+                          "unable to read datapath firmware capabilities\n");
+                return -EIO;
+        }
 
-        if (outlen >= sizeof(outbuf)) {
-                nic_data->datapath_caps =
-                        MCDI_DWORD(outbuf, GET_CAPABILITIES_OUT_FLAGS1);
-                if (!(nic_data->datapath_caps &
-                     (1 << MC_CMD_GET_CAPABILITIES_OUT_TX_TSO_LBN))) {
-                        netif_err(efx, drv, efx->net_dev,
-                                  "Capabilities don't indicate TSO support.\n");
-                        return -ENODEV;
-                }
+        nic_data->datapath_caps =
+                MCDI_DWORD(outbuf, GET_CAPABILITIES_OUT_FLAGS1);
+
+        if (!(nic_data->datapath_caps &
+              (1 << MC_CMD_GET_CAPABILITIES_OUT_TX_TSO_LBN))) {
+                netif_err(efx, drv, efx->net_dev,
+                          "current firmware does not support TSO\n");
+                return -ENODEV;
+        }
+
+        if (!(nic_data->datapath_caps &
+              (1 << MC_CMD_GET_CAPABILITIES_OUT_RX_PREFIX_LEN_14_LBN))) {
+                netif_err(efx, probe, efx->net_dev,
+                          "current firmware does not support an RX prefix\n");
+                return -ENODEV;
         }
 
         return 0;
@@ -217,21 +228,13 @@ static int efx_ef10_probe(struct efx_nic *efx)
         if (rc)
                 goto fail3;
 
-        rc = efx_ef10_init_capabilities(efx);
+        rc = efx_ef10_init_datapath_caps(efx);
         if (rc < 0)
                 goto fail3;
 
         efx->rx_packet_len_offset =
                 ES_DZ_RX_PREFIX_PKTLEN_OFST - ES_DZ_RX_PREFIX_SIZE;
 
-        if (!(nic_data->datapath_caps &
-              (1 << MC_CMD_GET_CAPABILITIES_OUT_RX_PREFIX_LEN_14_LBN))) {
-                netif_err(efx, probe, efx->net_dev,
-                          "current firmware does not support an RX prefix\n");
-                rc = -ENODEV;
-                goto fail3;
-        }
-
         rc = efx_mcdi_port_get_number(efx);
         if (rc < 0)
                 goto fail3;