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Commit 164c9f54 authored by Anjali Singhai Jain's avatar Anjali Singhai Jain Committed by Jeff Kirsher
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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: default avatarAnjali Singhai Jain <anjali.singhai@intel.com>
Tested-by: default avatarAndrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
parent 4f2f017c

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

+1 −0
Original line number Diff line number Diff line
@@ -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;

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

+1 −0
Original line number Diff line number Diff line
@@ -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,

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

+4 −1
Original line number Diff line number Diff line
@@ -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;

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

+3 −1
Original line number Diff line number Diff line
@@ -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;

	}

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

+1 −0
Original line number Diff line number Diff line
@@ -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 {