ixgbevf: Add XDP support for pass and drop actions

Implement XDP_PASS and XDP_DROP based on the ixgbe implementation.

Based largely on commit 92470808 ("ixgbe: add XDP support for pass and
drop actions").
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/ixgbevf/ethtool.c

 /*******************************************************************************
 
   Intel 82599 Virtual Function driver
-  Copyright(c) 1999 - 2015 Intel Corporation.
+  Copyright(c) 1999 - 2018 Intel Corporation.
 
   This program is free software; you can redistribute it and/or modify it
   under the terms and conditions of the GNU General Public License,
@@ -336,8 +336,13 @@ static int ixgbevf_set_ringparam(struct net_device *netdev,
 		for (i = 0; i < adapter->num_rx_queues; i++) {
 			/* clone ring and setup updated count */
 			rx_ring[i] = *adapter->rx_ring[i];
+
+			/* Clear copied XDP RX-queue info */
+			memset(&rx_ring[i].xdp_rxq, 0,
+			       sizeof(rx_ring[i].xdp_rxq));
+
 			rx_ring[i].count = new_rx_count;
-			err = ixgbevf_setup_rx_resources(&rx_ring[i]);
+			err = ixgbevf_setup_rx_resources(adapter, &rx_ring[i]);
 			if (err) {
 				while (i) {
 					i--;

drivers/net/ethernet/intel/ixgbevf/ixgbevf.h

@@ -2,7 +2,7 @@
 /*******************************************************************************
 
   Intel 82599 Virtual Function driver
-  Copyright(c) 1999 - 2015 Intel Corporation.
+  Copyright(c) 1999 - 2018 Intel Corporation.
 
   This program is free software; you can redistribute it and/or modify it
   under the terms and conditions of the GNU General Public License,
@@ -35,6 +35,7 @@
 #include <linux/netdevice.h>
 #include <linux/if_vlan.h>
 #include <linux/u64_stats_sync.h>
+#include <net/xdp.h>
 
 #include "vf.h"
 
@@ -100,6 +101,7 @@ struct ixgbevf_ring {
 	struct ixgbevf_ring *next;
 	struct ixgbevf_q_vector *q_vector;	/* backpointer to q_vector */
 	struct net_device *netdev;
+	struct bpf_prog *xdp_prog;
 	struct device *dev;
 	void *desc;			/* descriptor ring memory */
 	dma_addr_t dma;			/* phys. address of descriptor ring */
@@ -120,7 +122,7 @@ struct ixgbevf_ring {
 		struct ixgbevf_tx_queue_stats tx_stats;
 		struct ixgbevf_rx_queue_stats rx_stats;
 	};
-
+	struct xdp_rxq_info xdp_rxq;
 	u64 hw_csum_rx_error;
 	u8 __iomem *tail;
 	struct sk_buff *skb;
@@ -357,6 +359,7 @@ struct ixgbevf_adapter {
 
 	/* OS defined structs */
 	struct net_device *netdev;
+	struct bpf_prog *xdp_prog;
 	struct pci_dev *pdev;
 
 	/* structs defined in ixgbe_vf.h */
@@ -443,7 +446,8 @@ void ixgbevf_down(struct ixgbevf_adapter *adapter);
 void ixgbevf_reinit_locked(struct ixgbevf_adapter *adapter);
 void ixgbevf_reset(struct ixgbevf_adapter *adapter);
 void ixgbevf_set_ethtool_ops(struct net_device *netdev);
-int ixgbevf_setup_rx_resources(struct ixgbevf_ring *);
+int ixgbevf_setup_rx_resources(struct ixgbevf_adapter *adapter,
+			       struct ixgbevf_ring *rx_ring);
 int ixgbevf_setup_tx_resources(struct ixgbevf_ring *);
 void ixgbevf_free_rx_resources(struct ixgbevf_ring *);
 void ixgbevf_free_tx_resources(struct ixgbevf_ring *);