git: 74861578d955 - main - gve: Fix Tx tcpdump panic

The branch main has been updated by delphij:

URL: https://cgit.FreeBSD.org/src/commit/?id=74861578d95573e13a2099143f9d4e7edbb82806

commit 74861578d95573e13a2099143f9d4e7edbb82806
Author:     Shailend Chand <shailend@google.com>
AuthorDate: 2023-07-27 05:22:31 +0000
Commit:     Xin LI <delphij@FreeBSD.org>
CommitDate: 2023-07-27 05:36:42 +0000

    gve: Fix Tx tcpdump panic
    
    Ringing the doorbell before making the BPF call can result in the
    mbuf being freed before the BPF call.
    
    Reviewed-by:            markj
    MFC-after:              3 days
    Differential Revision: https://reviews.freebsd.org/D41189
---
 sys/dev/gve/gve_tx.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/sys/dev/gve/gve_tx.c b/sys/dev/gve/gve_tx.c
index dd48bc35a258..db3f7415f412 100644
--- a/sys/dev/gve/gve_tx.c
+++ b/sys/dev/gve/gve_tx.c
@@ -706,12 +706,12 @@ gve_xmit_br(struct gve_tx_ring *tx)
 			break;
 		}
 
+		drbr_advance(ifp, tx->br);
+		BPF_MTAP(ifp, mbuf);
+
 		bus_dmamap_sync(tx->desc_ring_mem.tag, tx->desc_ring_mem.map,
 		    BUS_DMASYNC_PREWRITE);
 		gve_db_bar_write_4(priv, tx->com.db_offset, tx->req);
-
-		drbr_advance(ifp, tx->br);
-                BPF_MTAP(ifp, mbuf);
 	}
 }