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vdpa/mlx5: Use kvzalloc_flex() for MTT command memory

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The create mkey command memory embeds the MTT array as a flexible array
member. Use kvzalloc_flex() to allocate it directly instead of open-coding
the struct_size() calculation with kvcalloc().

The MTT allocation still needs to be aligned to MLX5_VDPA_MTT_ALIGN bytes.
Since each MTT entry is __be64, align the entry count directly and avoid
carrying a separate byte length variable.

Assisted-by: Codex:GPT-5.5
Signed-off-by: Rosen Penev <rosenp@gmail.com>
Reviewed-by: Dragos Tatulea <dtatulea@nvidia.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Message-ID: <20260508051837.1744409-1-rosenp@gmail.com>
This commit is contained in:
Rosen Penev
2026-05-07 22:18:37 -07:00
committed by Michael S. Tsirkin
parent e13fc46b4d
commit 4d130b63bd
1 changed files with 3 additions and 4 deletions
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7
drivers/vdpa/mlx5/core/mr.c
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@@ -221,11 +221,10 @@ static int create_direct_keys(struct mlx5_vdpa_dev *mvdev, struct mlx5_vdpa_mr *
list_for_each_entry(dmr, &mr->head, list) {
struct mlx5_create_mkey_mem *cmd_mem;
int mttlen, mttcount;
int mttcount;
mttlen = roundup(MLX5_ST_SZ_BYTES(mtt) * dmr->nsg, MLX5_VDPA_MTT_ALIGN);
mttcount = mttlen / sizeof(cmd_mem->mtt[0]);
cmd_mem = kvcalloc(1, struct_size(cmd_mem, mtt, mttcount), GFP_KERNEL);
mttcount = ALIGN(dmr->nsg, MLX5_VDPA_MTT_ALIGN / sizeof(cmd_mem->mtt[0]));
cmd_mem = kvzalloc_flex(*cmd_mem, mtt, mttcount);
if (!cmd_mem) {
err = -ENOMEM;
goto done;