提交 164c9f54 编写于 作者: A Anjali Singhai Jain 提交者: Jeff Kirsher

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: NAnjali Singhai Jain <anjali.singhai@intel.com>
Tested-by: NAndrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>
上级 4f2f017c
......@@ -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;
......
......@@ -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,
......
......@@ -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;
......
......@@ -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;
}
......
......@@ -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 {
......
......@@ -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;
}
......
......@@ -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 {
......
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