[PATCH AUTOSEL 4.18 087/100] bnxt_en: get the reduced max_irqs by the ones used by RDMA

[Sasha Levin]

From: Vasundhara Volam <vasundhara-v.volam@xxxxxxxxxxxx>

[ Upstream commit c78fe058879bdea919d44f23e21da26f603e9166 ]

When getting the max rings supported, get the reduced max_irqs
by the ones used by RDMA.

If the number MSIX is the limiting factor, this bug may cause the
max ring count to be higher than it should be when RDMA driver is
loaded and may result in ring allocation failures.

Fixes: 30f529473ec9 ("bnxt_en: Do not modify max IRQ count after RDMA driver requests/frees IRQs.")
Signed-off-by: Vasundhara Volam <vasundhara-v.volam@xxxxxxxxxxxx>
Signed-off-by: Michael Chan <michael.chan@xxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 84a96c277994..6d22762ca1c5 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -8500,7 +8500,7 @@ static void _bnxt_get_max_rings(struct bnxt *bp, int *max_rx, int *max_tx,
 	*max_tx = hw_resc->max_tx_rings;
 	*max_rx = hw_resc->max_rx_rings;
 	*max_cp = min_t(int, bnxt_get_max_func_cp_rings_for_en(bp),
-			hw_resc->max_irqs);
+			hw_resc->max_irqs - bnxt_get_ulp_msix_num(bp));
 	*max_cp = min_t(int, *max_cp, hw_resc->max_stat_ctxs);
 	max_ring_grps = hw_resc->max_hw_ring_grps;
 	if (BNXT_CHIP_TYPE_NITRO_A0(bp) && BNXT_PF(bp)) {
-- 
2.17.1