bnxt_en: Notify firmware about IF state changes.

Use latest firmware API to notify firmware about IF state changes.
Firmware has the option to clean up resources during IF down and
to require the driver to reserve resources again during IF up.

Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 52 insertions, 2 deletions

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 165994047f81..56bd09758e22 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -3638,7 +3638,9 @@ int bnxt_hwrm_func_rgtr_async_events(struct bnxt *bp, unsigned long *bmap,
 
 static int bnxt_hwrm_func_drv_rgtr(struct bnxt *bp)
 {
+        struct hwrm_func_drv_rgtr_output *resp = bp->hwrm_cmd_resp_addr;
         struct hwrm_func_drv_rgtr_input req = {0};
+        int rc;
 
         bnxt_hwrm_cmd_hdr_init(bp, &req, HWRM_FUNC_DRV_RGTR, -1, -1);
 
@@ -3676,7 +3678,15 @@ static int bnxt_hwrm_func_drv_rgtr(struct bnxt *bp)
                         cpu_to_le32(FUNC_DRV_RGTR_REQ_ENABLES_VF_REQ_FWD);
         }
 
-        return hwrm_send_message(bp, &req, sizeof(req), HWRM_CMD_TIMEOUT);
+        mutex_lock(&bp->hwrm_cmd_lock);
+        rc = _hwrm_send_message(bp, &req, sizeof(req), HWRM_CMD_TIMEOUT);
+        if (rc)
+                rc = -EIO;
+        else if (resp->flags &
+                 cpu_to_le32(FUNC_DRV_RGTR_RESP_FLAGS_IF_CHANGE_SUPPORTED))
+                bp->fw_cap |= BNXT_FW_CAP_IF_CHANGE;
+        mutex_unlock(&bp->hwrm_cmd_lock);
+        return rc;
 }
 
 static int bnxt_hwrm_func_drv_unrgtr(struct bnxt *bp)
@@ -6637,6 +6647,39 @@ static int bnxt_hwrm_shutdown_link(struct bnxt *bp)
         return hwrm_send_message(bp, &req, sizeof(req), HWRM_CMD_TIMEOUT);
 }
 
+static int bnxt_hwrm_if_change(struct bnxt *bp, bool up)
+{
+        struct hwrm_func_drv_if_change_output *resp = bp->hwrm_cmd_resp_addr;
+        struct hwrm_func_drv_if_change_input req = {0};
+        bool resc_reinit = false;
+        int rc;
+
+        if (!(bp->fw_cap & BNXT_FW_CAP_IF_CHANGE))
+                return 0;
+
+        bnxt_hwrm_cmd_hdr_init(bp, &req, HWRM_FUNC_DRV_IF_CHANGE, -1, -1);
+        if (up)
+                req.flags = cpu_to_le32(FUNC_DRV_IF_CHANGE_REQ_FLAGS_UP);
+        mutex_lock(&bp->hwrm_cmd_lock);
+        rc = _hwrm_send_message(bp, &req, sizeof(req), HWRM_CMD_TIMEOUT);
+        if (!rc && (resp->flags &
+                    cpu_to_le32(FUNC_DRV_IF_CHANGE_RESP_FLAGS_RESC_CHANGE)))
+                resc_reinit = true;
+        mutex_unlock(&bp->hwrm_cmd_lock);
+
+        if (up && resc_reinit && BNXT_NEW_RM(bp)) {
+                struct bnxt_hw_resc *hw_resc = &bp->hw_resc;
+
+                rc = bnxt_hwrm_func_resc_qcaps(bp, true);
+                hw_resc->resv_cp_rings = 0;
+                hw_resc->resv_tx_rings = 0;
+                hw_resc->resv_rx_rings = 0;
+                hw_resc->resv_hw_ring_grps = 0;
+                hw_resc->resv_vnics = 0;
+        }
+        return rc;
+}
+
 static int bnxt_hwrm_port_led_qcaps(struct bnxt *bp)
 {
         struct hwrm_port_led_qcaps_output *resp = bp->hwrm_cmd_resp_addr;
@@ -6991,8 +7034,13 @@ void bnxt_half_close_nic(struct bnxt *bp)
 static int bnxt_open(struct net_device *dev)
 {
         struct bnxt *bp = netdev_priv(dev);
+        int rc;
 
-        return __bnxt_open_nic(bp, true, true);
+        bnxt_hwrm_if_change(bp, true);
+        rc = __bnxt_open_nic(bp, true, true);
+        if (rc)
+                bnxt_hwrm_if_change(bp, false);
+        return rc;
 }
 
 static bool bnxt_drv_busy(struct bnxt *bp)
@@ -7056,6 +7104,7 @@ static int bnxt_close(struct net_device *dev)
 
         bnxt_close_nic(bp, true, true);
         bnxt_hwrm_shutdown_link(bp);
+        bnxt_hwrm_if_change(bp, false);
         return 0;
 }
 
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
index ded2affd9ee8..6c40b25716d3 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
@@ -1290,6 +1290,7 @@ struct bnxt {
         #define BNXT_FW_CAP_LLDP_AGENT  0x00000002
         #define BNXT_FW_CAP_DCBX_AGENT  0x00000004
         #define BNXT_FW_CAP_NEW_RM      0x00000008
+        #define BNXT_FW_CAP_IF_CHANGE   0x00000010
 
 #define BNXT_NEW_RM(bp)         ((bp)->fw_cap & BNXT_FW_CAP_NEW_RM)
         u32                     hwrm_spec_code;