Similarly to other recently fixed drivers make sure we don't
try to access XDP or page pool APIs when NAPI budget is 0.
NAPI budget of 0 may mean that we are in netpoll.

This may result in running software IRQs in hard IRQ context,
leading to deadlocks or crashes.

Fixes: 322b87ca55f2 ("bnxt_en: add page_pool support")
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
CC: michael.chan@broadcom.com
CC: gospo@broadcom.com

Side note - having to plumb the "budget" everywhere really makes
me wonder if we shouldn't have had those APIs accept a pointer
to napi_struct instead :S
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c     | 19 +++++++++++--------
 drivers/net/ethernet/broadcom/bnxt/bnxt.h     |  2 +-
 drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c |  6 +++++-
 drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.h |  3 ++-
 4 files changed, 19 insertions(+), 11 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c
index 5b6fbdc4dc40..33b7eddfbf41 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c

@@ -125,7 +125,8 @@ static void __bnxt_xmit_xdp_redirect(struct bnxt *bp,
        dma_unmap_len_set(tx_buf, len, 0);
 }

-void bnxt_tx_int_xdp(struct bnxt *bp, struct bnxt_napi *bnapi, int nr_pkts)
+void bnxt_tx_int_xdp(struct bnxt *bp, struct bnxt_napi *bnapi, int nr_pkts,
+                    int budget)
 {
        struct bnxt_tx_ring_info *txr = bnapi->tx_ring;
        struct bnxt_rx_ring_info *rxr = bnapi->rx_ring;

@@ -135,6 +136,9 @@ void bnxt_tx_int_xdp(struct bnxt *bp, struct bnxt_napi *bnapi, int nr_pkts)
        u16 last_tx_cons = tx_cons;
        int i, j, frags;

+       if (!budget)
+               return;
+