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vdpa/mlx5: Distribute RX virtqueues in RQT object

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Distribute the available rx virtqueues amongst the available RQT
entries.

RQTs require to have a power of two entries. When creating or modifying
the RQT, use the lowest number of power of two entries that is not less
than the number of rx virtqueues. Distribute them in the available
entries such that some virtqueus may be referenced twice.

This allows to configure any number of virtqueue pairs when multiqueue
is used.

Reviewed-by: Si-Wei Liu <si-wei.liu@oracle.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Eli Cohen <elic@nvidia.com>
Link: https://lore.kernel.org/r/20220105114646.577224-3-elic@nvidia.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Eli Cohen 2022-01-05 13:46:34 +02:00 committed by Michael S. Tsirkin
parent a64917bc2e
commit a7f46ba424
1 changed files with 7 additions and 23 deletions
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30
drivers/vdpa/mlx5/net/mlx5_vnet.c
View file

@ -1259,17 +1259,10 @@ static int create_rqt(struct mlx5_vdpa_net *ndev)
MLX5_SET(rqtc, rqtc, list_q_type, MLX5_RQTC_LIST_Q_TYPE_VIRTIO_NET_Q);
MLX5_SET(rqtc, rqtc, rqt_max_size, max_rqt);
list = MLX5_ADDR_OF(rqtc, rqtc, rq_num[0]);
for (i = 0, j = 0; j < max_rqt; j++) {
if (!ndev->vqs[j].initialized)
continue;
if (!vq_is_tx(ndev->vqs[j].index)) {
list[i] = cpu_to_be32(ndev->vqs[j].virtq_id);
i++;
}
}
MLX5_SET(rqtc, rqtc, rqt_actual_size, i);
for (i = 0, j = 0; i < max_rqt; i++, j += 2)
list[i] = cpu_to_be32(ndev->vqs[j % ndev->mvdev.max_vqs].virtq_id);
MLX5_SET(rqtc, rqtc, rqt_actual_size, max_rqt);
err = mlx5_vdpa_create_rqt(&ndev->mvdev, in, inlen, &ndev->res.rqtn);
kfree(in);
if (err)
@ -1290,7 +1283,7 @@ static int modify_rqt(struct mlx5_vdpa_net *ndev, int num)
int i, j;
int err;
max_rqt = min_t(int, ndev->cur_num_vqs / 2,
max_rqt = min_t(int, roundup_pow_of_two(ndev->cur_num_vqs / 2),
1 << MLX5_CAP_GEN(ndev->mvdev.mdev, log_max_rqt_size));
if (max_rqt < 1)
return -EOPNOTSUPP;
@ -1306,16 +1299,10 @@ static int modify_rqt(struct mlx5_vdpa_net *ndev, int num)
MLX5_SET(rqtc, rqtc, list_q_type, MLX5_RQTC_LIST_Q_TYPE_VIRTIO_NET_Q);
list = MLX5_ADDR_OF(rqtc, rqtc, rq_num[0]);
for (i = 0, j = 0; j < num; j++) {
if (!ndev->vqs[j].initialized)
continue;
for (i = 0, j = 0; i < max_rqt; i++, j += 2)
list[i] = cpu_to_be32(ndev->vqs[j % num].virtq_id);
if (!vq_is_tx(ndev->vqs[j].index)) {
list[i] = cpu_to_be32(ndev->vqs[j].virtq_id);
i++;
}
}
MLX5_SET(rqtc, rqtc, rqt_actual_size, i);
MLX5_SET(rqtc, rqtc, rqt_actual_size, max_rqt);
err = mlx5_vdpa_modify_rqt(&ndev->mvdev, in, inlen, ndev->res.rqtn);
kfree(in);
if (err)
@ -1579,9 +1566,6 @@ static virtio_net_ctrl_ack handle_ctrl_mq(struct mlx5_vdpa_dev *mvdev, u8 cmd)
break;
}
if (newqps & (newqps - 1))
break;
if (!change_num_qps(mvdev, newqps))
status = VIRTIO_NET_OK;