i40e: Add a stat tracking new RX page allocations

Add a counter for new page allocations in the i40e RX path. This stat is
accessible with ethtool.
Signed-off-by: Joe Damato <jdamato@fastly.com>
Tested-by: Dave Switzer <david.switzer@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

drivers/net/ethernet/intel/i40e/i40e.h

@@ -855,6 +855,7 @@ struct i40e_vsi {
 	u64 rx_buf_failed;
 	u64 rx_page_failed;
 	u64 rx_page_reuse;
+	u64 rx_page_alloc;
 
 	/* These are containers of ring pointers, allocated at run-time */
 	struct i40e_ring **rx_rings;

drivers/net/ethernet/intel/i40e/i40e_ethtool.c

@@ -296,6 +296,7 @@ static const struct i40e_stats i40e_gstrings_misc_stats[] = {
 	I40E_VSI_STAT("rx_alloc_fail", rx_buf_failed),
 	I40E_VSI_STAT("rx_pg_alloc_fail", rx_page_failed),
 	I40E_VSI_STAT("rx_cache_reuse", rx_page_reuse),
+	I40E_VSI_STAT("rx_cache_alloc", rx_page_alloc),
 };
 
 /* These PF_STATs might look like duplicates of some NETDEV_STATs,

drivers/net/ethernet/intel/i40e/i40e_main.c

@@ -773,8 +773,8 @@ void i40e_update_veb_stats(struct i40e_veb *veb)
  **/
 static void i40e_update_vsi_stats(struct i40e_vsi *vsi)
 {
+	u64 rx_page, rx_buf, rx_reuse, rx_alloc;
 	struct i40e_pf *pf = vsi->back;
-	u64 rx_page, rx_buf, rx_reuse;
 	struct rtnl_link_stats64 *ons;
 	struct rtnl_link_stats64 *ns;   /* netdev stats */
 	struct i40e_eth_stats *oes;
@@ -807,6 +807,7 @@ static void i40e_update_vsi_stats(struct i40e_vsi *vsi)
 	rx_page = 0;
 	rx_buf = 0;
 	rx_reuse = 0;
+	rx_alloc = 0;
 	rcu_read_lock();
 	for (q = 0; q < vsi->num_queue_pairs; q++) {
 		/* locate Tx ring */
@@ -841,6 +842,7 @@ static void i40e_update_vsi_stats(struct i40e_vsi *vsi)
 		rx_buf += p->rx_stats.alloc_buff_failed;
 		rx_page += p->rx_stats.alloc_page_failed;
 		rx_reuse += p->rx_stats.page_reuse_count;
+		rx_alloc += p->rx_stats.page_alloc_count;
 
 		if (i40e_enabled_xdp_vsi(vsi)) {
 			/* locate XDP ring */
@@ -869,6 +871,7 @@ static void i40e_update_vsi_stats(struct i40e_vsi *vsi)
 	vsi->rx_page_failed = rx_page;
 	vsi->rx_buf_failed = rx_buf;
 	vsi->rx_page_reuse = rx_reuse;
+	vsi->rx_page_alloc = rx_alloc;
 
 	ns->rx_packets = rx_p;
 	ns->rx_bytes = rx_b;

drivers/net/ethernet/intel/i40e/i40e_txrx.c

@@ -1673,6 +1673,8 @@ static bool i40e_alloc_mapped_page(struct i40e_ring *rx_ring,
 		return false;
 	}
 
+	rx_ring->rx_stats.page_alloc_count++;
+
 	/* map page for use */
 	dma = dma_map_page_attrs(rx_ring->dev, page, 0,
 				 i40e_rx_pg_size(rx_ring),

drivers/net/ethernet/intel/i40e/i40e_txrx.h

@@ -298,6 +298,7 @@ struct i40e_rx_queue_stats {
 	u64 alloc_page_failed;
 	u64 alloc_buff_failed;
 	u64 page_reuse_count;
+	u64 page_alloc_count;
 };
 
 enum i40e_ring_state_t {