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Date: Mon, 13 Nov 2023 16:41:44 -0800
From: Ziwei Xiao <ziweixiao@...gle.com>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, kuba@...nel.org, edumazet@...gle.com, 
	pabeni@...hat.com, stable@...nel.org, willemb@...gle.com, csully@...gle.com, 
	shailend@...gle.com, jeroendb@...gle.com, pkaligineedi@...gle.com, 
	jonolson@...gle.com, sagis@...gle.com, lrizzo@...gle.com, bpf@...r.kernel.org, 
	ast@...nel.org, daniel@...earbox.net, hawk@...nel.org, 
	john.fastabend@...il.com, Ziwei Xiao <ziweixiao@...gle.com>
Subject: [PATCH net v2] gve: Fixes for napi_poll when budget is 0

Netpoll will explicilty pass the polling call with a budget of 0 to
indicate it's clearing the Tx path only. For the gve_rx_poll and
gve_xdp_poll, they were mistakenly taking the 0 budget as the indication
to do all the work. Add check to avoid the rx path and xdp path being
called when budget is 0. And also avoid napi_complete_done being called
when budget is 0 for netpoll.

Fixes: f5cedc84a30d ("gve: Add transmit and receive support")
Signed-off-by: Ziwei Xiao <ziweixiao@...gle.com>
---
Changes since v1:
 - Adjust the logic of checking budget when it's 0
 - Update the commit message based on the new change
 - CCed the maintainers queried from get_maintainer.pl, but it outputs 19 lines which seems excessive

 drivers/net/ethernet/google/gve/gve_main.c | 8 +++++++-
 drivers/net/ethernet/google/gve/gve_rx.c   | 4 ----
 drivers/net/ethernet/google/gve/gve_tx.c   | 4 ----
 3 files changed, 7 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/google/gve/gve_main.c b/drivers/net/ethernet/google/gve/gve_main.c
index 276f996f95dc..2d42e733837b 100644
--- a/drivers/net/ethernet/google/gve/gve_main.c
+++ b/drivers/net/ethernet/google/gve/gve_main.c
@@ -254,10 +254,13 @@ static int gve_napi_poll(struct napi_struct *napi, int budget)
 	if (block->tx) {
 		if (block->tx->q_num < priv->tx_cfg.num_queues)
 			reschedule |= gve_tx_poll(block, budget);
-		else
+		else if (budget)
 			reschedule |= gve_xdp_poll(block, budget);
 	}
 
+	if (!budget)
+		return 0;
+
 	if (block->rx) {
 		work_done = gve_rx_poll(block, budget);
 		reschedule |= work_done == budget;
@@ -298,6 +301,9 @@ static int gve_napi_poll_dqo(struct napi_struct *napi, int budget)
 	if (block->tx)
 		reschedule |= gve_tx_poll_dqo(block, /*do_clean=*/true);
 
+	if (!budget)
+		return 0;
+
 	if (block->rx) {
 		work_done = gve_rx_poll_dqo(block, budget);
 		reschedule |= work_done == budget;
diff --git a/drivers/net/ethernet/google/gve/gve_rx.c b/drivers/net/ethernet/google/gve/gve_rx.c
index e84a066aa1a4..73655347902d 100644
--- a/drivers/net/ethernet/google/gve/gve_rx.c
+++ b/drivers/net/ethernet/google/gve/gve_rx.c
@@ -1007,10 +1007,6 @@ int gve_rx_poll(struct gve_notify_block *block, int budget)
 
 	feat = block->napi.dev->features;
 
-	/* If budget is 0, do all the work */
-	if (budget == 0)
-		budget = INT_MAX;
-
 	if (budget > 0)
 		work_done = gve_clean_rx_done(rx, budget, feat);
 
diff --git a/drivers/net/ethernet/google/gve/gve_tx.c b/drivers/net/ethernet/google/gve/gve_tx.c
index 6957a865cff3..9f6ffc4a54f0 100644
--- a/drivers/net/ethernet/google/gve/gve_tx.c
+++ b/drivers/net/ethernet/google/gve/gve_tx.c
@@ -925,10 +925,6 @@ bool gve_xdp_poll(struct gve_notify_block *block, int budget)
 	bool repoll;
 	u32 to_do;
 
-	/* If budget is 0, do all the work */
-	if (budget == 0)
-		budget = INT_MAX;
-
 	/* Find out how much work there is to be done */
 	nic_done = gve_tx_load_event_counter(priv, tx);
 	to_do = min_t(u32, (nic_done - tx->done), budget);
-- 
2.43.0.rc0.421.g78406f8d94-goog


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