Re: [Qemu-devel] [PATCH 2/4] hw/rdma: Add support for managing SRQ resource

[Yuval Shaia <yuval.shaia@oracle.com>]

On Wed, Apr 03, 2019 at 02:33:41PM +0300, Kamal Heib wrote:
> Adding the required functions and definitions for support managing the
> shared receive queues (SRQs).
> 
> Signed-off-by: Kamal Heib <kamalheib1@gmail.com>
> ---
>  hw/rdma/rdma_rm.c      | 93 ++++++++++++++++++++++++++++++++++++++++++
>  hw/rdma/rdma_rm.h      | 10 +++++
>  hw/rdma/rdma_rm_defs.h |  8 ++++
>  3 files changed, 111 insertions(+)
> 
> diff --git a/hw/rdma/rdma_rm.c b/hw/rdma/rdma_rm.c
> index b683506b8616..c4fb140dcd96 100644
> --- a/hw/rdma/rdma_rm.c
> +++ b/hw/rdma/rdma_rm.c
> @@ -544,6 +544,96 @@ void rdma_rm_dealloc_qp(RdmaDeviceResources *dev_res, uint32_t qp_handle)
>      rdma_res_tbl_dealloc(&dev_res->qp_tbl, qp->qpn);
>  }
>  
> +RdmaRmSRQ *rdma_rm_get_srq(RdmaDeviceResources *dev_res, uint32_t srq_handle)
> +{
> +    return rdma_res_tbl_get(&dev_res->srq_tbl, srq_handle);
> +}
> +
> +int rdma_rm_alloc_srq(RdmaDeviceResources *dev_res, uint32_t pd_handle,
> +                      uint32_t max_wr, uint32_t max_sge, uint32_t srq_limit,
> +                      uint32_t *srq_handle, void *opaque)
> +{
> +    RdmaRmSRQ *srq;
> +    RdmaRmPD *pd;
> +    int rc;
> +
> +    pd = rdma_rm_get_pd(dev_res, pd_handle);
> +    if (!pd) {
> +        return -EINVAL;
> +    }
> +
> +    srq = rdma_res_tbl_alloc(&dev_res->srq_tbl, srq_handle);
> +    if (!srq) {
> +        return -ENOMEM;
> +    }
> +
> +    rc = rdma_backend_create_srq(&srq->backend_srq, &pd->backend_pd,
> +                                 max_wr, max_sge, srq_limit);
> +    if (rc) {
> +        rc = -EIO;
> +        goto out_dealloc_srq;
> +    }
> +
> +    srq->opaque = opaque;
> +
> +    return 0;
> +
> +out_dealloc_srq:
> +    rdma_res_tbl_dealloc(&dev_res->srq_tbl, *srq_handle);
> +
> +    return rc;
> +}
> +
> +int rdma_rm_query_srq(RdmaDeviceResources *dev_res, uint32_t srq_handle,
> +                      struct ibv_srq_attr *srq_attr)
> +{
> +    RdmaRmSRQ *srq;
> +
> +    srq = rdma_rm_get_srq(dev_res, srq_handle);
> +    if (!srq) {
> +        return -EINVAL;
> +    }
> +
> +    return rdma_backend_query_srq(&srq->backend_srq, srq_attr);
> +}
> +
> +int rdma_rm_modify_srq(RdmaDeviceResources *dev_res, uint32_t srq_handle,
> +                       struct ibv_srq_attr *srq_attr, int srq_attr_mask)
> +{
> +    RdmaRmSRQ *srq;
> +
> +    srq = rdma_rm_get_srq(dev_res, srq_handle);
> +    if (!srq) {
> +        return -EINVAL;
> +    }
> +
> +    if ((srq_attr_mask & IBV_SRQ_LIMIT) &&
> +        (srq_attr->srq_limit == 0)) {
> +        return -EINVAL;
> +    }
> +
> +    if ((srq_attr_mask & IBV_SRQ_MAX_WR) &&
> +        (srq_attr->max_wr == 0)) {
> +        return -EINVAL;
> +    }
> +
> +    return rdma_backend_modify_srq(&srq->backend_srq, srq_attr,
> +                                   srq_attr_mask);
> +}
> +
> +void rdma_rm_dealloc_srq(RdmaDeviceResources *dev_res, uint32_t srq_handle)
> +{
> +    RdmaRmSRQ *srq;
> +
> +    srq = rdma_rm_get_srq(dev_res, srq_handle);
> +    if (!srq) {
> +        return;
> +    }
> +
> +    rdma_backend_destroy_srq(&srq->backend_srq, dev_res);
> +    rdma_res_tbl_dealloc(&dev_res->srq_tbl, srq_handle);
> +}
> +
>  void *rdma_rm_get_cqe_ctx(RdmaDeviceResources *dev_res, uint32_t cqe_ctx_id)
>  {
>      void **cqe_ctx;
> @@ -673,6 +763,8 @@ int rdma_rm_init(RdmaDeviceResources *dev_res, struct ibv_device_attr *dev_attr)
>      res_tbl_init("CQE_CTX", &dev_res->cqe_ctx_tbl, dev_attr->max_qp *
>                         dev_attr->max_qp_wr, sizeof(void *));
>      res_tbl_init("UC", &dev_res->uc_tbl, MAX_UCS, sizeof(RdmaRmUC));
> +    res_tbl_init("SRQ", &dev_res->srq_tbl, dev_attr->max_srq,
> +                 sizeof(RdmaRmSRQ));
>  
>      init_ports(dev_res);
>  
> @@ -691,6 +783,7 @@ void rdma_rm_fini(RdmaDeviceResources *dev_res, RdmaBackendDev *backend_dev,
>  
>      fini_ports(dev_res, backend_dev, ifname);
>  
> +    res_tbl_free(&dev_res->srq_tbl);
>      res_tbl_free(&dev_res->uc_tbl);
>      res_tbl_free(&dev_res->cqe_ctx_tbl);
>      res_tbl_free(&dev_res->qp_tbl);
> diff --git a/hw/rdma/rdma_rm.h b/hw/rdma/rdma_rm.h
> index 4f03f9b8c5f1..e88ab95e264b 100644
> --- a/hw/rdma/rdma_rm.h
> +++ b/hw/rdma/rdma_rm.h
> @@ -65,6 +65,16 @@ int rdma_rm_query_qp(RdmaDeviceResources *dev_res, RdmaBackendDev *backend_dev,
>                       int attr_mask, struct ibv_qp_init_attr *init_attr);
>  void rdma_rm_dealloc_qp(RdmaDeviceResources *dev_res, uint32_t qp_handle);
>  
> +RdmaRmSRQ *rdma_rm_get_srq(RdmaDeviceResources *dev_res, uint32_t srq_handle);
> +int rdma_rm_alloc_srq(RdmaDeviceResources *dev_res, uint32_t pd_handle,
> +                      uint32_t max_wr, uint32_t max_sge, uint32_t srq_limit,
> +                      uint32_t *srq_handle, void *opaque);
> +int rdma_rm_query_srq(RdmaDeviceResources *dev_res, uint32_t srq_handle,
> +                      struct ibv_srq_attr *srq_attr);
> +int rdma_rm_modify_srq(RdmaDeviceResources *dev_res, uint32_t srq_handle,
> +                       struct ibv_srq_attr *srq_attr, int srq_attr_mask);
> +void rdma_rm_dealloc_srq(RdmaDeviceResources *dev_res, uint32_t srq_handle);
> +
>  int rdma_rm_alloc_cqe_ctx(RdmaDeviceResources *dev_res, uint32_t *cqe_ctx_id,
>                            void *ctx);
>  void *rdma_rm_get_cqe_ctx(RdmaDeviceResources *dev_res, uint32_t cqe_ctx_id);
> diff --git a/hw/rdma/rdma_rm_defs.h b/hw/rdma/rdma_rm_defs.h
> index e774af528022..7bdd9f291f9f 100644
> --- a/hw/rdma/rdma_rm_defs.h
> +++ b/hw/rdma/rdma_rm_defs.h
> @@ -33,6 +33,7 @@
>  #define MAX_QP_RD_ATOM        16
>  #define MAX_QP_INIT_RD_ATOM   16
>  #define MAX_AH                64
> +#define MAX_SRQ               512
>  
>  #define MAX_RM_TBL_NAME             16
>  #define MAX_CONSEQ_EMPTY_POLL_CQ    4096 /* considered as error above this */
> @@ -89,6 +90,12 @@ typedef struct RdmaRmQP {
>      enum ibv_qp_state qp_state;
>  } RdmaRmQP;
>  
> +typedef struct RdmaRmSRQ {
> +    RdmaBackendSRQ backend_srq;
> +    uint32_t recv_cq_handle;
> +    void *opaque;
> +} RdmaRmSRQ;
> +
>  typedef struct RdmaRmGid {
>      union ibv_gid gid;
>      int backend_gid_index;
> @@ -129,6 +136,7 @@ struct RdmaDeviceResources {
>      RdmaRmResTbl qp_tbl;
>      RdmaRmResTbl cq_tbl;
>      RdmaRmResTbl cqe_ctx_tbl;
> +    RdmaRmResTbl srq_tbl;
>      GHashTable *qp_hash; /* Keeps mapping between real and emulated */
>      QemuMutex lock;
>      RdmaRmStats stats;

For some reason v3 is omitted from subject, weird.
Anyway, looks like you took care for the comment raised.

With that - patch lgtm.

Reviewed-by: Yuval Shaia <yuval.shaia@oracle.com>

> -- 
> 2.20.1
> 
>