RDMA/mlx5: Fix mlx5 rates to IB rates map

Correct the map between mlx5 rates and corresponding ib rates, as they
don't always have a fixed offset between them.

Fixes: e126ba97dba9 ("mlx5: Add driver for Mellanox Connect-IB adapters")
Link: https://lore.kernel.org/r/20210304124517.1100608-4-leon@kernel.org
Signed-off-by: Mark Zhang <markzhang@nvidia.com>
Reviewed-by: Maor Gottlieb <maorg@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

diff --git a/drivers/infiniband/hw/mlx5/qp.c b/drivers/infiniband/hw/mlx5/qp.c
index ec4b3f6a8222ff89c37e87811568ebbba12474ac..79f498c83dc6b59784e7fb272d5fc440fa58d1e6 100644 (file)
--- a/drivers/infiniband/hw/mlx5/qp.c
+++ b/drivers/infiniband/hw/mlx5/qp.c
@@ -3142,6 +3142,19 @@ enum {
        MLX5_PATH_FLAG_COUNTER  = 1 << 2,
 };
 
+static int mlx5_to_ib_rate_map(u8 rate)
+{
+       static const int rates[] = { IB_RATE_PORT_CURRENT, IB_RATE_56_GBPS,
+                                    IB_RATE_25_GBPS,      IB_RATE_100_GBPS,
+                                    IB_RATE_200_GBPS,     IB_RATE_50_GBPS,
+                                    IB_RATE_400_GBPS };
+
+       if (rate < ARRAY_SIZE(rates))
+               return rates[rate];
+
+       return rate - MLX5_STAT_RATE_OFFSET;
+}
+
 static int ib_to_mlx5_rate_map(u8 rate)
 {
        switch (rate) {
@@ -4481,7 +4494,7 @@ static void to_rdma_ah_attr(struct mlx5_ib_dev *ibdev,
        rdma_ah_set_path_bits(ah_attr, MLX5_GET(ads, path, mlid));
 
        static_rate = MLX5_GET(ads, path, stat_rate);
-       rdma_ah_set_static_rate(ah_attr, static_rate ? static_rate - 5 : 0);
+       rdma_ah_set_static_rate(ah_attr, mlx5_to_ib_rate_map(static_rate));
        if (MLX5_GET(ads, path, grh) ||
            ah_attr->type == RDMA_AH_ATTR_TYPE_ROCE) {
                rdma_ah_set_grh(ah_attr, NULL, MLX5_GET(ads, path, flow_label),