Re: [PATCHv2 1/1] RDMA/irdma: Make the source udp port vary

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On 12/19/2021 4:44 AM, yanjun.zhu@xxxxxxxxx wrote:
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From: Zhu Yanjun <yanjun.zhu@xxxxxxxxx>

Based on the link https://www.spinics.net/lists/linux-rdma/msg73735.html,
get the source udp port number for a QP based on the grh.flow_label or
lqpn/rqpn. This provides a better spread of traffic across NIC RX queues.
The method in the commit 2b880b2e5e03 ("RDMA/mlx5: Define RoCEv2 udp
source port when set path") is a standard way. So it is also adopted in
this commit.

Signed-off-by: Zhu Yanjun <yanjun.zhu@xxxxxxxxx>
---
V1->V2: Adopt a standard method to get udp source port.
---
  drivers/infiniband/hw/irdma/verbs.c | 13 +++++++++++++
  1 file changed, 13 insertions(+)

diff --git a/drivers/infiniband/hw/irdma/verbs.c b/drivers/infiniband/hw/irdma/verbs.c
index 8cd5f9261692..9fe73d1db0d9 100644
--- a/drivers/infiniband/hw/irdma/verbs.c
+++ b/drivers/infiniband/hw/irdma/verbs.c
@@ -1094,6 +1094,15 @@ static int irdma_query_pkey(struct ib_device *ibdev, u32 port, u16 index,
         return 0;
  }

+
+static u16 irdma_get_udp_sport(u32 fl, u32 lqpn, u32 rqpn)
+{
+       if (!fl)
+               fl = rdma_calc_flow_label(lqpn, rqpn);
+
+       return rdma_flow_label_to_udp_sport(fl);
+}
+
  /**
   * irdma_modify_qp_roce - modify qp request
   * @ibqp: qp's pointer for modify
@@ -1159,6 +1168,10 @@ int irdma_modify_qp_roce(struct ib_qp *ibqp, struct ib_qp_attr *attr,

         ctx_info->roce_info->pd_id = iwpd->sc_pd.pd_id;

+       udp_info->src_port = irdma_get_udp_sport(udp_info->flow_label,
+                                                ibqp->qp_num,
+                                                roce_info->dest_qp);
+

FYI that in mlx5 driver the udp_sport is only set when address vector
and dest qpn (IB_QP_AV and IB_QP_DEST_QPN) is provided.

         if (attr_mask & IB_QP_AV) {
                 struct irdma_av *av = &iwqp->roce_ah.av;
                 const struct ib_gid_attr *sgid_attr;
--
2.27.0





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