net/mlx5e: When changing XDP program without reset, take refs for XSK RQs

stable inclusion
from stable-5.10.27
commit d0be25fa4f960dac846c894f43d481f3fa521864
bugzilla: 51493

--------------------------------

[ Upstream commit e5eb0134 ]

Each RQ (including XSK RQs) takes a reference to the XDP program. When
an XDP program is attached or detached, the channels and queues are
recreated, however, there is a special flow for changing an active XDP
program to another one. In that flow, channels and queues stay alive,
but the refcounts of the old and new XDP programs are adjusted. This
flow didn't increment refcount by the number of active XSK RQs, and this
commit fixes it.

Fixes: db05815b ("net/mlx5e: Add XSK zero-copy support")
Signed-off-by: NMaxim Mikityanskiy <maximmi@mellanox.com>
Reviewed-by: NTariq Toukan <tariqt@nvidia.com>
Signed-off-by: NSaeed Mahameed <saeedm@nvidia.com>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Acked-by: N  Weilong Chen <chenweilong@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/net/ethernet/mellanox/mlx5/core/en_main.c

@@ -4494,8 +4494,10 @@ static int mlx5e_xdp_set(struct net_device *netdev, struct bpf_prog *prog)
 		struct mlx5e_channel *c = priv->channels.c[i];
 
 		mlx5e_rq_replace_xdp_prog(&c->rq, prog);
-		if (test_bit(MLX5E_CHANNEL_STATE_XSK, c->state))
+		if (test_bit(MLX5E_CHANNEL_STATE_XSK, c->state)) {
+			bpf_prog_inc(prog);
 			mlx5e_rq_replace_xdp_prog(&c->xskrq, prog);
+		}
 	}
 
 unlock: