linux-next: build failure after merge of the net-next tree

Stephen Rothwell
2022-03-21T07:39:48Z

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Hi all,

After merging the net-next tree, today's linux-next build (x86_64
allmodconfig) failed like this:

In file included from include/linux/string.h:253,
from include/linux/bitmap.h:11,
from include/linux/cpumask.h:12,
from arch/x86/include/asm/cpumask.h:5,
from arch/x86/include/asm/msr.h:11,
from arch/x86/include/asm/processor.h:22,
from arch/x86/include/asm/timex.h:5,
from include/linux/timex.h:65,
from include/linux/time32.h:13,
from include/linux/time.h:60,
from include/linux/ktime.h:24,
from include/linux/timer.h:6,
from include/linux/netdevice.h:24,
from include/trace/events/xdp.h:8,
from include/linux/bpf_trace.h:5,
from drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c:33:
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);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Caused by commit

9ded70fa1d81 ("net/mlx5e: Don't prefill WQEs in XDP SQ in the multi buffer mode")

exposed by the kspp tree.

I have applied the following fix patch for today (a better one is
probably possible).

From: Stephen Rothwell <sfr@canb.auug.org.au>
Date: Mon, 21 Mar 2022 18:29:24 +1100
Subject: [PATCH] fxup for "net/mlx5e: Don't prefill WQEs in XDP SQ in the multi buffer mode"

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
---
drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c | 3 +--
include/linux/mlx5/qp.h | 5 +++++
2 files changed, 6 insertions(+), 2 deletions(-)

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
--
2.34.1

--
Cheers,
Stephen Rothwell

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