netdev - [PATCH net] gve: Fix XDP TX completion handling when counters overflow

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Message-ID: <20240716171041.1561142-1-pkaligineedi@google.com>
Date: Tue, 16 Jul 2024 10:10:41 -0700
From: Praveen Kaligineedi <pkaligineedi@...gle.com>
To: netdev@...r.kernel.org
Cc: stable@...nel.org, hramamurthy@...gle.com, jfraker@...gle.com, 
	jeroendb@...gle.com, shailend@...gle.com, davem@...emloft.net, 
	edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com, ast@...nel.org, 
	daniel@...earbox.net, hawk@...nel.org, john.fastabend@...il.com, 
	ziweixiao@...gle.com, willemb@...gle.com, 
	Joshua Washington <joshwash@...gle.com>, Praveen Kaligineedi <pkaligineedi@...gle.com>
Subject: [PATCH net] gve: Fix XDP TX completion handling when counters overflow

From: Joshua Washington <joshwash@...gle.com>

In gve_clean_xdp_done, the driver processes the TX completions based on
a 32-bit NIC counter and a 32-bit completion counter stored in the tx
queue.

Fix the for loop so that the counter wraparound is handled correctly.

Fixes: 75eaae158b1b ("gve: Add XDP DROP and TX support for GQI-QPL format")
Signed-off-by: Joshua Washington <joshwash@...gle.com>
Signed-off-by: Praveen Kaligineedi <pkaligineedi@...gle.com>
---
 drivers/net/ethernet/google/gve/gve_tx.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/google/gve/gve_tx.c b/drivers/net/ethernet/google/gve/gve_tx.c
index 24a64ec1073e..e7fb7d6d283d 100644
--- a/drivers/net/ethernet/google/gve/gve_tx.c
+++ b/drivers/net/ethernet/google/gve/gve_tx.c
@@ -158,15 +158,16 @@ static int gve_clean_xdp_done(struct gve_priv *priv, struct gve_tx_ring *tx,
 			      u32 to_do)
 {
 	struct gve_tx_buffer_state *info;
-	u32 clean_end = tx->done + to_do;
 	u64 pkts = 0, bytes = 0;
 	size_t space_freed = 0;
 	u32 xsk_complete = 0;
 	u32 idx;
+	int i;
 
-	for (; tx->done < clean_end; tx->done++) {
+	for (i = 0; i < to_do; i++) {
 		idx = tx->done & tx->mask;
 		info = &tx->info[idx];
+		tx->done++;
 
 		if (unlikely(!info->xdp.size))
 			continue;
-- 
2.45.2.803.g4e1b14247a-goog