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Message-Id: <20220208215117.1733822-6-anthony.l.nguyen@intel.com>
Date: Tue, 8 Feb 2022 13:51:17 -0800
From: Tony Nguyen <anthony.l.nguyen@...el.com>
To: davem@...emloft.net, kuba@...nel.org
Cc: Joe Damato <jdamato@...tly.com>, netdev@...r.kernel.org,
anthony.l.nguyen@...el.com, sassmann@...hat.com,
Dave Switzer <david.switzer@...el.com>
Subject: [PATCH net-next 5/5] i40e: Add a stat for tracking busy rx pages
From: Joe Damato <jdamato@...tly.com>
In some cases, pages cannot be reused by i40e because the page is busy. Add
a counter for this event.
Busy page count is accessible via ethtool.
Signed-off-by: Joe Damato <jdamato@...tly.com>
Tested-by: Dave Switzer <david.switzer@...el.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
---
drivers/net/ethernet/intel/i40e/i40e.h | 1 +
drivers/net/ethernet/intel/i40e/i40e_ethtool.c | 1 +
drivers/net/ethernet/intel/i40e/i40e_main.c | 5 ++++-
drivers/net/ethernet/intel/i40e/i40e_txrx.c | 12 ++++++++----
drivers/net/ethernet/intel/i40e/i40e_txrx.h | 1 +
5 files changed, 15 insertions(+), 5 deletions(-)
diff --git a/drivers/net/ethernet/intel/i40e/i40e.h b/drivers/net/ethernet/intel/i40e/i40e.h
index d2e71db65fb4..55c6bce5da61 100644
--- a/drivers/net/ethernet/intel/i40e/i40e.h
+++ b/drivers/net/ethernet/intel/i40e/i40e.h
@@ -857,6 +857,7 @@ struct i40e_vsi {
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;
diff --git a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
index 7e76cd0e7d55..e48499624d22 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
@@ -298,6 +298,7 @@ static const struct i40e_stats i40e_gstrings_misc_stats[] = {
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,
diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 385b241abf06..9b7ce6d9a92b 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, rx_waive;
+ 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 */
@@ -809,6 +809,7 @@ static void i40e_update_vsi_stats(struct i40e_vsi *vsi)
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 */
@@ -845,6 +846,7 @@ static void i40e_update_vsi_stats(struct i40e_vsi *vsi)
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 */
@@ -875,6 +877,7 @@ static void i40e_update_vsi_stats(struct i40e_vsi *vsi)
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;
diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
index 3d91b1655aec..a628f4b43fe8 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
@@ -1990,8 +1990,8 @@ static bool i40e_cleanup_headers(struct i40e_ring *rx_ring, struct sk_buff *skb,
* pointing to; otherwise, the DMA mapping needs to be destroyed and
* page freed.
*
- * rx_stats will be updated to indicate if the page was waived because it was
- * not reusable.
+ * 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,
@@ -2008,13 +2008,17 @@ static bool i40e_can_reuse_rx_page(struct i40e_rx_buffer *rx_buffer,
#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
diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.h b/drivers/net/ethernet/intel/i40e/i40e_txrx.h
index b1955d3f4718..324699ec930b 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.h
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.h
@@ -300,6 +300,7 @@ struct i40e_rx_queue_stats {
u64 page_reuse_count;
u64 page_alloc_count;
u64 page_waive_count;
+ u64 page_busy_count;
};
enum i40e_ring_state_t {
--
2.31.1
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