netdev - [PATCH net-next 02/13] bnxt_en: Fix AGG ring check logic in bnxt_check

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Date: Mon, 11 Dec 2023 16:51:11 -0800
From: Michael Chan <michael.chan@...adcom.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	gospo@...adcom.com,
	Somnath Kotur <somnath.kotur@...adcom.com>
Subject: [PATCH net-next 02/13] bnxt_en: Fix AGG ring check logic in bnxt_check_rings()

From: Somnath Kotur <somnath.kotur@...adcom.com>

_bnxt_get_max_rings() that is invoked in bnxt_check_rings() already
accounts for the AGG ring(s) and gives a max value based on that.
Increasing for AGG rings before calling _bnxt_get_max_rings() will
result in checking for twice the number of rings than required and
it can fail.  Fix it by adjusting for AGG rings after calling
_bnxt_get_max_rings().

Fixes: f5b29c6afe36 ("bnxt_en: Add helper to get the number of CP rings required for TX rings")
Signed-off-by: Somnath Kotur <somnath.kotur@...adcom.com>
Signed-off-by: Michael Chan <michael.chan@...adcom.com>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 7afbbc71f92f..114beaa95e78 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -12724,14 +12724,14 @@ int bnxt_check_rings(struct bnxt *bp, int tx, int rx, bool sh, int tcs,
 	if (tcs)
 		tx_sets = tcs;
 
-	if (bp->flags & BNXT_FLAG_AGG_RINGS)
-		rx_rings <<= 1;
-
 	_bnxt_get_max_rings(bp, &max_rx, &max_tx, &max_cp);
 
 	if (max_rx < rx_rings)
 		return -ENOMEM;
 
+	if (bp->flags & BNXT_FLAG_AGG_RINGS)
+		rx_rings <<= 1;
+
 	tx_rings_needed = tx * tx_sets + tx_xdp;
 	if (max_tx < tx_rings_needed)
 		return -ENOMEM;
-- 
2.30.1


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