i40evf: Allow PF driver to configure RSS

If the PF driver reports proper support, allow the PF driver to
configure RSS on the behalf of the VF driver. This will allow for RSS
support on future hardware without changes to the VF driver.

Unfortunately, the old RSS code still needs to stay as the driver needs
to be compatible with PF drivers that don't support this interface. But
this change still simplifies the data structures a bunch and makes this
code simpler to read and maintain.

Change-ID: I0375aad40788ecdc0cb24d5cfeccf07804e69771
Signed-off-by: Mitch Williams <mitch.a.williams@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 119 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/i40evf/i40evf_virtchnl.c b/drivers/net/ethernet/intel/i40evf/i40evf_virtchnl.c
index 488e738f76c6..e62c56b5a141 100644
--- a/drivers/net/ethernet/intel/i40evf/i40evf_virtchnl.c
+++ b/drivers/net/ethernet/intel/i40evf/i40evf_virtchnl.c
@@ -681,6 +681,115 @@ void i40evf_request_stats(struct i40evf_adapter *adapter)
 		/* if the request failed, don't lock out others */
 		adapter->current_op = I40E_VIRTCHNL_OP_UNKNOWN;
 }
+
+/**
+ * i40evf_get_hena
+ * @adapter: adapter structure
+ *
+ * Request hash enable capabilities from PF
+ **/
+void i40evf_get_hena(struct i40evf_adapter *adapter)
+{
+	if (adapter->current_op != I40E_VIRTCHNL_OP_UNKNOWN) {
+		/* bail because we already have a command pending */
+		dev_err(&adapter->pdev->dev, "Cannot get RSS hash capabilities, command %d pending\n",
+			adapter->current_op);
+		return;
+	}
+	adapter->current_op = I40E_VIRTCHNL_OP_GET_RSS_HENA_CAPS;
+	adapter->aq_required &= ~I40EVF_FLAG_AQ_GET_HENA;
+	i40evf_send_pf_msg(adapter, I40E_VIRTCHNL_OP_GET_RSS_HENA_CAPS,
+			   NULL, 0);
+}
+
+/**
+ * i40evf_set_hena
+ * @adapter: adapter structure
+ *
+ * Request the PF to set our RSS hash capabilities
+ **/
+void i40evf_set_hena(struct i40evf_adapter *adapter)
+{
+	struct i40e_virtchnl_rss_hena vrh;
+
+	if (adapter->current_op != I40E_VIRTCHNL_OP_UNKNOWN) {
+		/* bail because we already have a command pending */
+		dev_err(&adapter->pdev->dev, "Cannot set RSS hash enable, command %d pending\n",
+			adapter->current_op);
+		return;
+	}
+	vrh.hena = adapter->hena;
+	adapter->current_op = I40E_VIRTCHNL_OP_SET_RSS_HENA;
+	adapter->aq_required &= ~I40EVF_FLAG_AQ_SET_HENA;
+	i40evf_send_pf_msg(adapter, I40E_VIRTCHNL_OP_SET_RSS_HENA,
+			   (u8 *)&vrh, sizeof(vrh));
+}
+
+/**
+ * i40evf_set_rss_key
+ * @adapter: adapter structure
+ *
+ * Request the PF to set our RSS hash key
+ **/
+void i40evf_set_rss_key(struct i40evf_adapter *adapter)
+{
+	struct i40e_virtchnl_rss_key *vrk;
+	int len;
+
+	if (adapter->current_op != I40E_VIRTCHNL_OP_UNKNOWN) {
+		/* bail because we already have a command pending */
+		dev_err(&adapter->pdev->dev, "Cannot set RSS key, command %d pending\n",
+			adapter->current_op);
+		return;
+	}
+	len = sizeof(struct i40e_virtchnl_rss_key) +
+	      (adapter->rss_key_size * sizeof(u8)) - 1;
+	vrk = kzalloc(len, GFP_KERNEL);
+	if (!vrk)
+		return;
+	vrk->vsi_id = adapter->vsi.id;
+	vrk->key_len = adapter->rss_key_size;
+	memcpy(vrk->key, adapter->rss_key, adapter->rss_key_size);
+
+	adapter->current_op = I40E_VIRTCHNL_OP_CONFIG_RSS_KEY;
+	adapter->aq_required &= ~I40EVF_FLAG_AQ_SET_RSS_KEY;
+	i40evf_send_pf_msg(adapter, I40E_VIRTCHNL_OP_CONFIG_RSS_KEY,
+			   (u8 *)vrk, len);
+	kfree(vrk);
+}
+
+/**
+ * i40evf_set_rss_lut
+ * @adapter: adapter structure
+ *
+ * Request the PF to set our RSS lookup table
+ **/
+void i40evf_set_rss_lut(struct i40evf_adapter *adapter)
+{
+	struct i40e_virtchnl_rss_lut *vrl;
+	int len;
+
+	if (adapter->current_op != I40E_VIRTCHNL_OP_UNKNOWN) {
+		/* bail because we already have a command pending */
+		dev_err(&adapter->pdev->dev, "Cannot set RSS LUT, command %d pending\n",
+			adapter->current_op);
+		return;
+	}
+	len = sizeof(struct i40e_virtchnl_rss_lut) +
+	      (adapter->rss_lut_size * sizeof(u8)) - 1;
+	vrl = kzalloc(len, GFP_KERNEL);
+	if (!vrl)
+		return;
+	vrl->vsi_id = adapter->vsi.id;
+	vrl->lut_entries = adapter->rss_lut_size;
+	memcpy(vrl->lut, adapter->rss_lut, adapter->rss_lut_size);
+	adapter->current_op = I40E_VIRTCHNL_OP_CONFIG_RSS_LUT;
+	adapter->aq_required &= ~I40EVF_FLAG_AQ_SET_RSS_LUT;
+	i40evf_send_pf_msg(adapter, I40E_VIRTCHNL_OP_CONFIG_RSS_LUT,
+			   (u8 *)vrl, len);
+	kfree(vrl);
+}
+
 /**
  * i40evf_request_reset
  * @adapter: adapter structure
@@ -820,6 +929,16 @@ void i40evf_virtchnl_completion(struct i40evf_adapter *adapter,
 		if (v_opcode != adapter->current_op)
 			return;
 		break;
+	case I40E_VIRTCHNL_OP_GET_RSS_HENA_CAPS: {
+		struct i40e_virtchnl_rss_hena *vrh =
+			(struct i40e_virtchnl_rss_hena *)msg;
+		if (msglen == sizeof(*vrh))
+			adapter->hena = vrh->hena;
+		else
+			dev_warn(&adapter->pdev->dev,
+				 "Invalid message %d from PF\n", v_opcode);
+		}
+		break;
 	default:
 		if (v_opcode != adapter->current_op)
 			dev_warn(&adapter->pdev->dev, "Expected response %d from PF, received %d\n",