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Michal Suchanek |
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From 41ed0a00ffcd903ece4304a4a65d95706115ffcb Mon Sep 17 00:00:00 2001
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Michal Suchanek |
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From: "Dwip N. Banerjee" <dnbanerg@us.ibm.com>
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Michal Suchanek |
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Date: Wed, 18 Nov 2020 19:12:25 -0600
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Michal Suchanek |
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Subject: [PATCH] ibmvnic: Do not replenish RX buffers after every polling loop
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Michal Suchanek |
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Michal Suchanek |
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References: bsc#1184114 ltc#192237 bsc#1179243 ltc#189290
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Michal Suchanek |
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Patch-mainline: v5.11-rc1
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Git-commit: 41ed0a00ffcd903ece4304a4a65d95706115ffcb
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Michal Suchanek |
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Michal Suchanek |
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Reduce the amount of time spent replenishing RX buffers by only doing
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so once available buffers has fallen under a certain threshold, in this
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case half of the total number of buffers, or if the polling loop exits
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before the packets processed is less than its budget. Non-exhaustion of
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NAPI budget implies lower incoming packet pressure, allowing the leeway
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to refill the buffers in preparation for any impending burst.
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Signed-off-by: Dwip N. Banerjee <dnbanerg@us.ibm.com>
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Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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Acked-by: Michal Suchanek <msuchanek@suse.de>
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Michal Suchanek |
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---
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drivers/net/ethernet/ibm/ibmvnic.c | 5 ++++-
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1 file changed, 4 insertions(+), 1 deletion(-)
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diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
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index 96df6d8fa277..9fe43ab0496d 100644
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--- a/drivers/net/ethernet/ibm/ibmvnic.c
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+++ b/drivers/net/ethernet/ibm/ibmvnic.c
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@@ -2537,7 +2537,10 @@ static int ibmvnic_poll(struct napi_struct *napi, int budget)
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frames_processed++;
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}
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- if (adapter->state != VNIC_CLOSING)
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+ if (adapter->state != VNIC_CLOSING &&
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+ ((atomic_read(&adapter->rx_pool[scrq_num].available) <
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+ adapter->req_rx_add_entries_per_subcrq / 2) ||
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+ frames_processed < budget))
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replenish_rx_pool(adapter, &adapter->rx_pool[scrq_num]);
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if (frames_processed < budget) {
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if (napi_complete_done(napi, frames_processed)) {
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--
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Michal Suchanek |
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2.26.2
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