bnxt_en: get the reduced max_irqs by the ones used by RDMA

[ 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@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index d63996a7ff25a8e4a830312d29feb6481d348985..33f0861057fd9074bffe441d12118c2bac47d4f6 100644 (file)
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -8501,7 +8501,7 @@ 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)) {