i40e/i40evf: Add a stat to track how many times we have to do a force WB

When in NAPI with interrupts disabled, the HW needs to be forced to do a
write back on TX if the number of descriptors pending are less than a
cache line.

This stat helps keep track of how many times we get into this situation.

Change-ID: I76c1bcc7ebccd6bffcc5aa33bfe05f2fa1c9a984
Signed-off-by: Anjali Singhai Jain <anjali.singhai@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/i40e/i40e.h b/drivers/net/ethernet/intel/i40e/i40e.h
index 4dd3e26..ca07a7b 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e.h
+++ b/drivers/net/ethernet/intel/i40e/i40e.h
@@ -487,6 +487,7 @@ struct i40e_vsi {
        u32 tx_restart;
        u32 tx_busy;
        u64 tx_linearize;
+       u64 tx_force_wb;
        u32 rx_buf_failed;
        u32 rx_page_failed;
 

diff --git a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
index 3f385ff..eeb1af4 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
@@ -88,6 +88,7 @@ static const struct i40e_stats i40e_gstrings_misc_stats[] = {
        I40E_VSI_STAT("tx_broadcast", eth_stats.tx_broadcast),
        I40E_VSI_STAT("rx_unknown_protocol", eth_stats.rx_unknown_protocol),
        I40E_VSI_STAT("tx_linearize", tx_linearize),
+       I40E_VSI_STAT("tx_force_wb", tx_force_wb),
 };
 
 /* 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 781a6f4..0e6abc2 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -881,6 +881,7 @@ static void i40e_update_vsi_stats(struct i40e_vsi *vsi)
        u64 bytes, packets;
        unsigned int start;
        u64 tx_linearize;
+       u64 tx_force_wb;
        u64 rx_p, rx_b;
        u64 tx_p, tx_b;
        u16 q;
@@ -899,7 +900,7 @@ static void i40e_update_vsi_stats(struct i40e_vsi *vsi)
         */
        rx_b = rx_p = 0;
        tx_b = tx_p = 0;
-       tx_restart = tx_busy = tx_linearize = 0;
+       tx_restart = tx_busy = tx_linearize = tx_force_wb = 0;
        rx_page = 0;
        rx_buf = 0;
        rcu_read_lock();
@@ -917,6 +918,7 @@ static void i40e_update_vsi_stats(struct i40e_vsi *vsi)
                tx_restart += p->tx_stats.restart_queue;
                tx_busy += p->tx_stats.tx_busy;
                tx_linearize += p->tx_stats.tx_linearize;
+               tx_force_wb += p->tx_stats.tx_force_wb;
 
                /* Rx queue is part of the same block as Tx queue */
                p = &p[1];
@@ -934,6 +936,7 @@ static void i40e_update_vsi_stats(struct i40e_vsi *vsi)
        vsi->tx_restart = tx_restart;
        vsi->tx_busy = tx_busy;
        vsi->tx_linearize = tx_linearize;
+       vsi->tx_force_wb = tx_force_wb;
        vsi->rx_page_failed = rx_page;
        vsi->rx_buf_failed = rx_buf;
 

diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
index 98680b6..dbd2bca 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
@@ -1925,8 +1925,10 @@ int i40e_napi_poll(struct napi_struct *napi, int budget)
        /* If work not completed, return budget and polling will return */
        if (!clean_complete) {
 tx_only:
-               if (arm_wb)
+               if (arm_wb) {
+                       q_vector->tx.ring[0].tx_stats.tx_force_wb++;
                        i40e_force_wb(vsi, q_vector);
+               }
                return budget;
        }
 

diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.h b/drivers/net/ethernet/intel/i40e/i40e_txrx.h
index 6779fb7..dccc1eb 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.h
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.h
@@ -202,6 +202,7 @@ struct i40e_tx_queue_stats {
        u64 tx_busy;
        u64 tx_done_old;
        u64 tx_linearize;
+       u64 tx_force_wb;
 };
 
 struct i40e_rx_queue_stats {

diff --git a/drivers/net/ethernet/intel/i40evf/i40e_txrx.c b/drivers/net/ethernet/intel/i40evf/i40e_txrx.c
index a4eea08..8629a9f 100644 (file)
--- a/drivers/net/ethernet/intel/i40evf/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40evf/i40e_txrx.c
@@ -1363,8 +1363,10 @@ int i40evf_napi_poll(struct napi_struct *napi, int budget)
        /* If work not completed, return budget and polling will return */
        if (!clean_complete) {
 tx_only:
-               if (arm_wb)
+               if (arm_wb) {
+                       q_vector->tx.ring[0].tx_stats.tx_force_wb++;
                        i40evf_force_wb(vsi, q_vector);
+               }
                return budget;
        }
 

diff --git a/drivers/net/ethernet/intel/i40evf/i40e_txrx.h b/drivers/net/ethernet/intel/i40evf/i40e_txrx.h
index ebc1bf7..997b374 100644 (file)
--- a/drivers/net/ethernet/intel/i40evf/i40e_txrx.h
+++ b/drivers/net/ethernet/intel/i40evf/i40e_txrx.h
@@ -201,6 +201,7 @@ struct i40e_tx_queue_stats {
        u64 tx_busy;
        u64 tx_done_old;
        u64 tx_linearize;
+       u64 tx_force_wb;
 };
 
 struct i40e_rx_queue_stats {