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authorJoe Damato <jdamato@fastly.com>2021-12-17 22:35:18 +0300
committerTony Nguyen <anthony.l.nguyen@intel.com>2022-02-08 19:21:52 +0300
commitcb963b989755ed49f002b7b7c8c7a9c744e21bb0 (patch)
treecbe8a1d8b09ee7c09fcf066cc8a1f4dfdee918f3
parent453f8305483851c20a41b66719d5acdc945541ca (diff)
downloadlinux-cb963b989755ed49f002b7b7c8c7a9c744e21bb0.tar.xz
i40e: Add a stat for tracking pages waived
In some cases, pages can not be reused because they are not associated with the correct NUMA zone. Knowing how often pages are waived helps users to understand the interaction between the driver's memory usage and their system. Pass rx_stats through to i40e_can_reuse_rx_page to allow tracking when pages are waived. The page waive count is accessible via 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>
-rw-r--r--drivers/net/ethernet/intel/i40e/i40e.h1
-rw-r--r--drivers/net/ethernet/intel/i40e/i40e_ethtool.c1
-rw-r--r--drivers/net/ethernet/intel/i40e/i40e_main.c5
-rw-r--r--drivers/net/ethernet/intel/i40e/i40e_txrx.c13
-rw-r--r--drivers/net/ethernet/intel/i40e/i40e_txrx.h1
5 files changed, 17 insertions, 4 deletions
diff --git a/drivers/net/ethernet/intel/i40e/i40e.h b/drivers/net/ethernet/intel/i40e/i40e.h
index ea8021d9739c..d2e71db65fb4 100644
--- a/drivers/net/ethernet/intel/i40e/i40e.h
+++ b/drivers/net/ethernet/intel/i40e/i40e.h
@@ -856,6 +856,7 @@ struct i40e_vsi {
u64 rx_page_failed;
u64 rx_page_reuse;
u64 rx_page_alloc;
+ u64 rx_page_waive;
/* These are containers of ring pointers, allocated at run-time */
struct i40e_ring **rx_rings;
diff --git a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
index 17a16b4e4405..7e76cd0e7d55 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
@@ -297,6 +297,7 @@ static const struct i40e_stats i40e_gstrings_misc_stats[] = {
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),
};
/* These PF_STATs might look like duplicates of some NETDEV_STATs,
diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 9d62f5875c30..385b241abf06 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -773,7 +773,7 @@ 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;
+ u64 rx_page, rx_buf, rx_reuse, rx_alloc, rx_waive;
struct i40e_pf *pf = vsi->back;
struct rtnl_link_stats64 *ons;
struct rtnl_link_stats64 *ns; /* netdev stats */
@@ -808,6 +808,7 @@ static void i40e_update_vsi_stats(struct i40e_vsi *vsi)
rx_buf = 0;
rx_reuse = 0;
rx_alloc = 0;
+ rx_waive = 0;
rcu_read_lock();
for (q = 0; q < vsi->num_queue_pairs; q++) {
/* locate Tx ring */
@@ -843,6 +844,7 @@ static void i40e_update_vsi_stats(struct i40e_vsi *vsi)
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;
if (i40e_enabled_xdp_vsi(vsi)) {
/* locate XDP ring */
@@ -872,6 +874,7 @@ static void i40e_update_vsi_stats(struct i40e_vsi *vsi)
vsi->rx_buf_failed = rx_buf;
vsi->rx_page_reuse = rx_reuse;
vsi->rx_page_alloc = rx_alloc;
+ vsi->rx_page_waive = rx_waive;
ns->rx_packets = rx_p;
ns->rx_bytes = rx_b;
diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
index 54fd497f6535..3d91b1655aec 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
@@ -1982,22 +1982,29 @@ 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 if the page was waived because it was
+ * not reusable.
*/
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 */
@@ -2237,7 +2244,7 @@ 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 {
diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.h b/drivers/net/ethernet/intel/i40e/i40e_txrx.h
index 13188dcf4e8e..b1955d3f4718 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.h
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.h
@@ -299,6 +299,7 @@ struct i40e_rx_queue_stats {
u64 alloc_buff_failed;
u64 page_reuse_count;
u64 page_alloc_count;
+ u64 page_waive_count;
};
enum i40e_ring_state_t {