sfc: Reinitialise and re-validate datapath caps after MC reboot

After an MC reboot, the datapath may be running a different firmware
variant and have different capabilities.  It is critical that we know
the current capabilities so that we can pass valid flags to
MC_CMD_INIT_EVQ.

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

2 files changed, 13 insertions, 0 deletions

diff --git a/drivers/net/ethernet/sfc/ef10.c b/drivers/net/ethernet/sfc/ef10.c
index a4956b86d145..9f18ae984f9e 100644
--- a/drivers/net/ethernet/sfc/ef10.c
+++ b/drivers/net/ethernet/sfc/ef10.c
@@ -343,6 +343,13 @@ static int efx_ef10_init_nic(struct efx_nic *efx)
         struct efx_ef10_nic_data *nic_data = efx->nic_data;
         int rc;
 
+        if (nic_data->must_check_datapath_caps) {
+                rc = efx_ef10_init_datapath_caps(efx);
+                if (rc)
+                        return rc;
+                nic_data->must_check_datapath_caps = false;
+        }
+
         if (nic_data->must_realloc_vis) {
                 /* We cannot let the number of VIs change now */
                 rc = efx_ef10_alloc_vis(efx, nic_data->n_allocated_vis,
@@ -711,6 +718,9 @@ static int efx_ef10_mcdi_poll_reboot(struct efx_nic *efx)
         nic_data->must_restore_filters = true;
         nic_data->rx_rss_context = EFX_EF10_RSS_CONTEXT_INVALID;
 
+        /* The datapath firmware might have been changed */
+        nic_data->must_check_datapath_caps = true;
+
         /* MAC statistics have been cleared on the NIC; clear the local
          * statistic that we update with efx_update_diff_stat().
          */
diff --git a/drivers/net/ethernet/sfc/nic.h b/drivers/net/ethernet/sfc/nic.h
index 4b1e188f7a2f..fda29d39032f 100644
--- a/drivers/net/ethernet/sfc/nic.h
+++ b/drivers/net/ethernet/sfc/nic.h
@@ -400,6 +400,8 @@ enum {
  * @rx_rss_context: Firmware handle for our RSS context
  * @stats: Hardware statistics
  * @workaround_35388: Flag: firmware supports workaround for bug 35388
+ * @must_check_datapath_caps: Flag: @datapath_caps needs to be revalidated
+ *      after MC reboot
  * @datapath_caps: Capabilities of datapath firmware (FLAGS1 field of
  *      %MC_CMD_GET_CAPABILITIES response)
  */
@@ -413,6 +415,7 @@ struct efx_ef10_nic_data {
         u32 rx_rss_context;
         u64 stats[EF10_STAT_COUNT];
         bool workaround_35388;
+        bool must_check_datapath_caps;
         u32 datapath_caps;
 };