netdev - [PATCH net-next v2 9/9] ibmvnic: Do not replenish RX buffers after every polling loop

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Date:   Wed, 18 Nov 2020 19:12:25 -0600
From:   Thomas Falcon <tlfalcon@...ux.ibm.com>
To:     kuba@...nel.org
Cc:     netdev@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        cforno12@...ux.ibm.com, ljp@...ux.vnet.ibm.com,
        ricklind@...ux.ibm.com, dnbanerg@...ibm.com,
        drt@...ux.vnet.ibm.com, brking@...ux.vnet.ibm.com,
        sukadev@...ux.vnet.ibm.com, tlfalcon@...ux.ibm.com
Subject: [PATCH net-next v2 9/9] ibmvnic: Do not replenish RX buffers after every polling loop

From: "Dwip N. Banerjee" <dnbanerg@...ibm.com>

Reduce the amount of time spent replenishing RX buffers by
only doing so once available buffers has fallen under a certain
threshold, in this case half of the total number of buffers, or
if the polling loop exits before the packets processed is less
than its budget.

Signed-off-by: Dwip N. Banerjee <dnbanerg@...ibm.com>
---
 drivers/net/ethernet/ibm/ibmvnic.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index 96df6d8fa277..9fe43ab0496d 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -2537,7 +2537,10 @@ static int ibmvnic_poll(struct napi_struct *napi, int budget)
 		frames_processed++;
 	}
 
-	if (adapter->state != VNIC_CLOSING)
+	if (adapter->state != VNIC_CLOSING &&
+	    ((atomic_read(&adapter->rx_pool[scrq_num].available) <
+	      adapter->req_rx_add_entries_per_subcrq / 2) ||
+	      frames_processed < budget))
 		replenish_rx_pool(adapter, &adapter->rx_pool[scrq_num]);
 	if (frames_processed < budget) {
 		if (napi_complete_done(napi, frames_processed)) {
-- 
2.26.2