Merge branch '40GbE' of git://git.kernel.org/pub/scm/linux/kernel/git/tnguy/next

-queue

Tony Nguyen says:

====================
40GbE Intel Wired LAN Driver Updates 2022-02-08

Joe Damato says:

This patch set makes several updates to the i40e driver stats collection
and reporting code to help users of i40e get a better sense of how the
driver is performing and interacting with the rest of the kernel.

These patches include some new stats (like waived and busy) which were
inspired by other drivers that track stats using the same nomenclature.

The new stats and an existing stat, rx_reuse, are now accessible with
ethtool to make harvesting this data more convenient for users.
====================

Signed-off-by: David S. Miller <[email protected]>

Author: davem330

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

@@ -854,6 +854,10 @@ struct i40e_vsi {
 	u64 tx_force_wb;
 	u64 rx_buf_failed;
 	u64 rx_page_failed;
+	u64 rx_page_reuse;
+	u64 rx_page_alloc;
+	u64 rx_page_waive;
+	u64 rx_page_busy;
 
 	/* These are containers of ring pointers, allocated at run-time */
 	struct i40e_ring **rx_rings;

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

@@ -295,6 +295,10 @@ static const struct i40e_stats i40e_gstrings_misc_stats[] = {
 	I40E_VSI_STAT("tx_busy", tx_busy),
 	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),
+	I40E_VSI_STAT("rx_cache_waive", rx_page_waive),
+	I40E_VSI_STAT("rx_cache_busy", rx_page_busy),
 };
 
 /* These PF_STATs might look like duplicates of some NETDEV_STATs,

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

@@ -773,14 +773,14 @@ 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, rx_waive, rx_busy;
 	struct i40e_pf *pf = vsi->back;
 	struct rtnl_link_stats64 *ons;
 	struct rtnl_link_stats64 *ns;   /* netdev stats */
 	struct i40e_eth_stats *oes;
 	struct i40e_eth_stats *es;     /* device's eth stats */
 	u64 tx_restart, tx_busy;
 	struct i40e_ring *p;
-	u64 rx_page, rx_buf;
 	u64 bytes, packets;
 	unsigned int start;
 	u64 tx_linearize;
@@ -806,6 +806,10 @@ static void i40e_update_vsi_stats(struct i40e_vsi *vsi)
 	tx_restart = tx_busy = tx_linearize = tx_force_wb = 0;
 	rx_page = 0;
 	rx_buf = 0;
+	rx_reuse = 0;
+	rx_alloc = 0;
+	rx_waive = 0;
+	rx_busy = 0;
 	rcu_read_lock();
 	for (q = 0; q < vsi->num_queue_pairs; q++) {
 		/* locate Tx ring */
@@ -839,6 +843,10 @@ static void i40e_update_vsi_stats(struct i40e_vsi *vsi)
 		rx_p += packets;
 		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;
+		rx_waive += p->rx_stats.page_waive_count;
+		rx_busy += p->rx_stats.page_busy_count;
 
 		if (i40e_enabled_xdp_vsi(vsi)) {
 			/* locate XDP ring */
@@ -866,6 +874,10 @@ static void i40e_update_vsi_stats(struct i40e_vsi *vsi)
 	vsi->tx_force_wb = tx_force_wb;
 	vsi->rx_page_failed = rx_page;
 	vsi->rx_buf_failed = rx_buf;
+	vsi->rx_page_reuse = rx_reuse;
+	vsi->rx_page_alloc = rx_alloc;
+	vsi->rx_page_waive = rx_waive;
+	vsi->rx_page_busy = rx_busy;
 
 	ns->rx_packets = rx_p;
 	ns->rx_bytes = rx_b;

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

@@ -1382,8 +1382,6 @@ static void i40e_reuse_rx_page(struct i40e_ring *rx_ring,
 	new_buff->page_offset	= old_buff->page_offset;
 	new_buff->pagecnt_bias	= old_buff->pagecnt_bias;
 
-	rx_ring->rx_stats.page_reuse_count++;
-
 	/* clear contents of buffer_info */
 	old_buff->page = NULL;
 }
@@ -1675,6 +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),
@@ -1982,32 +1982,43 @@ static bool i40e_cleanup_headers(struct i40e_ring *rx_ring, struct sk_buff *skb,
 /**
  * i40e_can_reuse_rx_page - Determine if page can be reused for another Rx
  * @rx_buffer: buffer containing the page
+ * @rx_stats: rx stats structure for the rx ring
  * @rx_buffer_pgcnt: buffer page refcount pre xdp_do_redirect() call
  *
  * If page is reusable, we have a green light for calling i40e_reuse_rx_page,
  * which will assign the current buffer to the buffer that next_to_alloc is
  * pointing to; otherwise, the DMA mapping needs to be destroyed and
- * page freed
+ * page freed.
+ *
+ * rx_stats will be updated to indicate whether the page was waived
+ * or busy if it could not be reused.
  */
 static bool i40e_can_reuse_rx_page(struct i40e_rx_buffer *rx_buffer,
+				   struct i40e_rx_queue_stats *rx_stats,
 				   int rx_buffer_pgcnt)
 {
 	unsigned int pagecnt_bias = rx_buffer->pagecnt_bias;
 	struct page *page = rx_buffer->page;
 
 	/* Is any reuse possible? */
-	if (!dev_page_is_reusable(page))
+	if (!dev_page_is_reusable(page)) {
+		rx_stats->page_waive_count++;
 		return false;
+	}
 
 #if (PAGE_SIZE < 8192)
 	/* if we are only owner of page we can reuse it */
-	if (unlikely((rx_buffer_pgcnt - pagecnt_bias) > 1))
+	if (unlikely((rx_buffer_pgcnt - pagecnt_bias) > 1)) {
+		rx_stats->page_busy_count++;
 		return false;
+	}
 #else
 #define I40E_LAST_OFFSET \
 	(SKB_WITH_OVERHEAD(PAGE_SIZE) - I40E_RXBUFFER_2048)
-	if (rx_buffer->page_offset > I40E_LAST_OFFSET)
+	if (rx_buffer->page_offset > I40E_LAST_OFFSET) {
+		rx_stats->page_busy_count++;
 		return false;
+	}
 #endif
 
 	/* If we have drained the page fragment pool we need to update
@@ -2237,7 +2248,7 @@ static void i40e_put_rx_buffer(struct i40e_ring *rx_ring,
 			       struct i40e_rx_buffer *rx_buffer,
 			       int rx_buffer_pgcnt)
 {
-	if (i40e_can_reuse_rx_page(rx_buffer, rx_buffer_pgcnt)) {
+	if (i40e_can_reuse_rx_page(rx_buffer, &rx_ring->rx_stats, rx_buffer_pgcnt)) {
 		/* hand second half of page back to the ring */
 		i40e_reuse_rx_page(rx_ring, rx_buffer);
 	} else {

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

@@ -298,6 +298,9 @@ struct i40e_rx_queue_stats {
 	u64 alloc_page_failed;
 	u64 alloc_buff_failed;
 	u64 page_reuse_count;
+	u64 page_alloc_count;
+	u64 page_waive_count;
+	u64 page_busy_count;
 };
 
 enum i40e_ring_state_t {