diff options
Diffstat (limited to 'drivers/vdpa/mlx5/core/resources.c')
-rw-r--r-- | drivers/vdpa/mlx5/core/resources.c | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/drivers/vdpa/mlx5/core/resources.c b/drivers/vdpa/mlx5/core/resources.c index 5c5a41b64bfc..22ea32fe007b 100644 --- a/drivers/vdpa/mlx5/core/resources.c +++ b/drivers/vdpa/mlx5/core/resources.c @@ -321,3 +321,76 @@ void mlx5_vdpa_free_resources(struct mlx5_vdpa_dev *mvdev) mutex_destroy(&mvdev->mr_mtx); res->valid = false; } + +static void virtqueue_cmd_callback(int status, struct mlx5_async_work *context) +{ + struct mlx5_vdpa_async_cmd *cmd = + container_of(context, struct mlx5_vdpa_async_cmd, cb_work); + + cmd->err = mlx5_cmd_check(context->ctx->dev, status, cmd->in, cmd->out); + complete(&cmd->cmd_done); +} + +static int issue_async_cmd(struct mlx5_vdpa_dev *mvdev, + struct mlx5_vdpa_async_cmd *cmds, + int issued, + int *completed) + +{ + struct mlx5_vdpa_async_cmd *cmd = &cmds[issued]; + int err; + +retry: + err = mlx5_cmd_exec_cb(&mvdev->async_ctx, + cmd->in, cmd->inlen, + cmd->out, cmd->outlen, + virtqueue_cmd_callback, + &cmd->cb_work); + if (err == -EBUSY) { + if (*completed < issued) { + /* Throttled by own commands: wait for oldest completion. */ + wait_for_completion(&cmds[*completed].cmd_done); + (*completed)++; + + goto retry; + } else { + /* Throttled by external commands: switch to sync api. */ + err = mlx5_cmd_exec(mvdev->mdev, + cmd->in, cmd->inlen, + cmd->out, cmd->outlen); + if (!err) + (*completed)++; + } + } + + return err; +} + +int mlx5_vdpa_exec_async_cmds(struct mlx5_vdpa_dev *mvdev, + struct mlx5_vdpa_async_cmd *cmds, + int num_cmds) +{ + int completed = 0; + int issued = 0; + int err = 0; + + for (int i = 0; i < num_cmds; i++) + init_completion(&cmds[i].cmd_done); + + while (issued < num_cmds) { + + err = issue_async_cmd(mvdev, cmds, issued, &completed); + if (err) { + mlx5_vdpa_err(mvdev, "error issuing command %d of %d: %d\n", + issued, num_cmds, err); + break; + } + + issued++; + } + + while (completed < issued) + wait_for_completion(&cmds[completed++].cmd_done); + + return err; +} |