From: Saeed Mahameed Date: Tue, 22 Mar 2022 17:22:24 +0000 (-0700) Subject: net/mlx5e: Fix build warning, detected write beyond size of field X-Git-Tag: microblaze-v5.19~142^2~9 X-Git-Url: http://git.monstr.eu/?a=commitdiff_plain;h=2af7e566a8616c278e1d7287ce86cd3900bed943;p=linux-2.6-microblaze.git net/mlx5e: Fix build warning, detected write beyond size of field When merged with Linus tree, the cited patch below will cause the following build warning: In function 'fortify_memset_chk', inlined from 'mlx5e_xmit_xdp_frame' at drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c:438:3: include/linux/fortify-string.h:242:25: error: call to '__write_overflow_field' declared with attribute warning: detected write beyond size of field (1st parameter); maybe use struct_group()? [-Werror=attribute-warning] 242 | __write_overflow_field(p_size_field, size); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Fix that by grouping the fields to memeset in struct_group() to avoid the false alarm. Fixes: 9ded70fa1d81 ("net/mlx5e: Don't prefill WQEs in XDP SQ in the multi buffer mode") Reported-by: Stephen Rothwell Suggested-by: Stephen Rothwell Signed-off-by: Saeed Mahameed Link: https://lore.kernel.org/r/20220322172224.31849-1-saeed@kernel.org Signed-off-by: Jakub Kicinski --- diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c b/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c index f35b62ce4c07..8f321a6c0809 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c @@ -435,8 +435,7 @@ mlx5e_xmit_xdp_frame(struct mlx5e_xdpsq *sq, struct mlx5e_xmit_data *xdptxd, u8 num_pkts = 1 + num_frags; int i; - memset(&cseg->signature, 0, sizeof(*cseg) - - sizeof(cseg->opmod_idx_opcode) - sizeof(cseg->qpn_ds)); + memset(&cseg->trailer, 0, sizeof(cseg->trailer)); memset(eseg, 0, sizeof(*eseg) - sizeof(eseg->trailer)); eseg->inline_hdr.sz = cpu_to_be16(inline_hdr_sz); diff --git a/include/linux/mlx5/qp.h b/include/linux/mlx5/qp.h index 61e48d459b23..8bda3ba5b109 100644 --- a/include/linux/mlx5/qp.h +++ b/include/linux/mlx5/qp.h @@ -202,6 +202,9 @@ struct mlx5_wqe_fmr_seg { struct mlx5_wqe_ctrl_seg { __be32 opmod_idx_opcode; __be32 qpn_ds; + + struct_group(trailer, + u8 signature; u8 rsvd[2]; u8 fm_ce_se; @@ -211,6 +214,8 @@ struct mlx5_wqe_ctrl_seg { __be32 umr_mkey; __be32 tis_tir_num; }; + + ); /* end of trailer group */ }; #define MLX5_WQE_CTRL_DS_MASK 0x3f