netdev - [net-next 09/11] net/mlx5e: Add support for UNREADABLE netmem page pools

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Message-ID: <20250116215530.158886-10-saeed@kernel.org>
Date: Thu, 16 Jan 2025 13:55:27 -0800
From: Saeed Mahameed <saeed@...nel.org>
To: "David S. Miller" <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Eric Dumazet <edumazet@...gle.com>
Cc: Saeed Mahameed <saeedm@...dia.com>,
	netdev@...r.kernel.org,
	Tariq Toukan <tariqt@...dia.com>,
	Gal Pressman <gal@...dia.com>,
	Leon Romanovsky <leonro@...dia.com>,
	Dragos Tatulea <dtatulea@...dia.com>
Subject: [net-next 09/11] net/mlx5e: Add support for UNREADABLE netmem page pools

From: Saeed Mahameed <saeedm@...dia.com>

On netdev_rx_queue_restart, a special type of page pool maybe expected.

In this patch declare support for UNREADABLE netmem iov pages in the
pool params only when header data split shampo RQ mode is enabled, also
set the queue index in the page pool params struct.

Shampo mode requirement: Without header split rx needs to peek at the data,
we can't do UNREADABLE_NETMEM.

Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
Reviewed-by: Dragos Tatulea <dtatulea@...dia.com>
Reviewed-by: Tariq Toukan <tariqt@...dia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index 02c9737868b3..340ed7d3feac 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -946,6 +946,11 @@ static int mlx5e_alloc_rq(struct mlx5e_params *params,
 		pp_params.netdev    = rq->netdev;
 		pp_params.dma_dir   = rq->buff.map_dir;
 		pp_params.max_len   = PAGE_SIZE;
+		pp_params.queue_idx = rq->ix;
+
+		/* Shampo header data split rx path allow for unreadable netmem */
+		if (test_bit(MLX5E_RQ_STATE_SHAMPO, &rq->state))
+			pp_params.flags |= PP_FLAG_ALLOW_UNREADABLE_NETMEM;
 
 		/* page_pool can be used even when there is no rq->xdp_prog,
 		 * given page_pool does not handle DMA mapping there is no
-- 
2.48.0