Re: [Qemu-devel] [PATCH v3 4/4] hw/pvrdma: Add support for SRQ

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

On Wed, Apr 03, 2019 at 02:33:43PM +0300, Kamal Heib wrote:
> Implement the pvrdma device commands for supporting SRQ
> 
> Signed-off-by: Kamal Heib <kamalheib1@gmail.com>
> ---
>  hw/rdma/vmw/pvrdma_cmd.c    | 147 ++++++++++++++++++++++++++++++++++++
>  hw/rdma/vmw/pvrdma_main.c   |  16 ++++
>  hw/rdma/vmw/pvrdma_qp_ops.c |  46 ++++++++++-
>  hw/rdma/vmw/pvrdma_qp_ops.h |   1 +
>  4 files changed, 209 insertions(+), 1 deletion(-)
> 
> diff --git a/hw/rdma/vmw/pvrdma_cmd.c b/hw/rdma/vmw/pvrdma_cmd.c
> index b931bb6dc9d4..8d70c0d23de4 100644
> --- a/hw/rdma/vmw/pvrdma_cmd.c
> +++ b/hw/rdma/vmw/pvrdma_cmd.c
> @@ -609,6 +609,149 @@ static int destroy_uc(PVRDMADev *dev, union pvrdma_cmd_req *req,
>      return 0;
>  }
>  
> +static int create_srq_ring(PCIDevice *pci_dev, PvrdmaRing **ring,
> +                           uint64_t pdir_dma, uint32_t max_wr,
> +                           uint32_t max_sge, uint32_t nchunks)
> +{
> +    uint64_t *dir = NULL, *tbl = NULL;
> +    PvrdmaRing *r;
> +    int rc = -EINVAL;
> +    char ring_name[MAX_RING_NAME_SZ];
> +    uint32_t wqe_sz;
> +
> +    if (!nchunks || nchunks > PVRDMA_MAX_FAST_REG_PAGES) {
> +        rdma_error_report("Got invalid page count for SRQ ring: %d",
> +                          nchunks);
> +        return rc;
> +    }
> +
> +    dir = rdma_pci_dma_map(pci_dev, pdir_dma, TARGET_PAGE_SIZE);
> +    if (!dir) {
> +        rdma_error_report("Failed to map to SRQ page directory");
> +        goto out;
> +    }
> +
> +    tbl = rdma_pci_dma_map(pci_dev, dir[0], TARGET_PAGE_SIZE);
> +    if (!tbl) {
> +        rdma_error_report("Failed to map to SRQ page table");
> +        goto out;
> +    }
> +
> +    r = g_malloc(sizeof(*r));
> +    *ring = r;
> +
> +    r->ring_state = (struct pvrdma_ring *)
> +            rdma_pci_dma_map(pci_dev, tbl[0], TARGET_PAGE_SIZE);
> +    if (!r->ring_state) {
> +        rdma_error_report("Failed to map tp SRQ ring state");
> +        goto out_free_ring_mem;
> +    }
> +
> +    wqe_sz = pow2ceil(sizeof(struct pvrdma_rq_wqe_hdr) +
> +                      sizeof(struct pvrdma_sge) * max_sge - 1);
> +    sprintf(ring_name, "srq_ring_%" PRIx64, pdir_dma);
> +    rc = pvrdma_ring_init(r, ring_name, pci_dev, &r->ring_state[1], max_wr,
> +                          wqe_sz, (dma_addr_t *)&tbl[1], nchunks - 1);
> +    if (rc) {
> +        goto out_unmap_ring_state;
> +    }
> +
> +    goto out;
> +
> +out_unmap_ring_state:
> +    rdma_pci_dma_unmap(pci_dev, r->ring_state, TARGET_PAGE_SIZE);
> +
> +out_free_ring_mem:
> +    g_free(r);
> +
> +out:
> +    rdma_pci_dma_unmap(pci_dev, tbl, TARGET_PAGE_SIZE);
> +    rdma_pci_dma_unmap(pci_dev, dir, TARGET_PAGE_SIZE);
> +
> +    return rc;
> +}
> +
> +static void destroy_srq_ring(PvrdmaRing *ring)
> +{
> +    pvrdma_ring_free(ring);
> +    rdma_pci_dma_unmap(ring->dev, ring->ring_state, TARGET_PAGE_SIZE);
> +    g_free(ring);
> +}
> +
> +static int create_srq(PVRDMADev *dev, union pvrdma_cmd_req *req,
> +                      union pvrdma_cmd_resp *rsp)
> +{
> +    struct pvrdma_cmd_create_srq *cmd = &req->create_srq;
> +    struct pvrdma_cmd_create_srq_resp *resp = &rsp->create_srq_resp;
> +    PvrdmaRing *ring = NULL;
> +    int rc;
> +
> +    memset(resp, 0, sizeof(*resp));
> +
> +    rc = create_srq_ring(PCI_DEVICE(dev), &ring, cmd->pdir_dma,
> +                         cmd->attrs.max_wr, cmd->attrs.max_sge,
> +                         cmd->nchunks);
> +    if (rc) {
> +        return rc;
> +    }
> +
> +    rc = rdma_rm_alloc_srq(&dev->rdma_dev_res, cmd->pd_handle,
> +                           cmd->attrs.max_wr, cmd->attrs.max_sge,
> +                           cmd->attrs.srq_limit, &resp->srqn, ring);
> +    if (rc) {
> +        destroy_srq_ring(ring);
> +        return rc;
> +    }
> +
> +    return 0;
> +}
> +
> +static int query_srq(PVRDMADev *dev, union pvrdma_cmd_req *req,
> +                     union pvrdma_cmd_resp *rsp)
> +{
> +    struct pvrdma_cmd_query_srq *cmd = &req->query_srq;
> +    struct pvrdma_cmd_query_srq_resp *resp = &rsp->query_srq_resp;
> +
> +    memset(resp, 0, sizeof(*resp));
> +
> +    return rdma_rm_query_srq(&dev->rdma_dev_res, cmd->srq_handle,
> +                             (struct ibv_srq_attr *)&resp->attrs);
> +}
> +
> +static int modify_srq(PVRDMADev *dev, union pvrdma_cmd_req *req,
> +                      union pvrdma_cmd_resp *rsp)
> +{
> +    struct pvrdma_cmd_modify_srq *cmd = &req->modify_srq;
> +
> +    /* Only support SRQ limit */
> +    if (!(cmd->attr_mask & IBV_SRQ_LIMIT) ||
> +        (cmd->attr_mask & IBV_SRQ_MAX_WR))
> +            return -EINVAL;
> +
> +    return rdma_rm_modify_srq(&dev->rdma_dev_res, cmd->srq_handle,
> +                              (struct ibv_srq_attr *)&cmd->attrs,
> +                              cmd->attr_mask);
> +}
> +
> +static int destroy_srq(PVRDMADev *dev, union pvrdma_cmd_req *req,
> +                       union pvrdma_cmd_resp *rsp)
> +{
> +    struct pvrdma_cmd_destroy_srq *cmd = &req->destroy_srq;
> +    RdmaRmSRQ *srq;
> +    PvrdmaRing *ring;
> +
> +    srq = rdma_rm_get_srq(&dev->rdma_dev_res, cmd->srq_handle);
> +    if (!srq) {
> +        return -EINVAL;
> +    }
> +
> +    ring = (PvrdmaRing *)srq->opaque;
> +    destroy_srq_ring(ring);
> +    rdma_rm_dealloc_srq(&dev->rdma_dev_res, cmd->srq_handle);
> +
> +    return 0;
> +}
> +
>  struct cmd_handler {
>      uint32_t cmd;
>      uint32_t ack;
> @@ -634,6 +777,10 @@ static struct cmd_handler cmd_handlers[] = {
>      {PVRDMA_CMD_DESTROY_UC,   PVRDMA_CMD_DESTROY_UC_RESP_NOOP,   destroy_uc},
>      {PVRDMA_CMD_CREATE_BIND,  PVRDMA_CMD_CREATE_BIND_RESP_NOOP,  create_bind},
>      {PVRDMA_CMD_DESTROY_BIND, PVRDMA_CMD_DESTROY_BIND_RESP_NOOP, destroy_bind},
> +    {PVRDMA_CMD_CREATE_SRQ,   PVRDMA_CMD_CREATE_SRQ_RESP,        create_srq},
> +    {PVRDMA_CMD_QUERY_SRQ,    PVRDMA_CMD_QUERY_SRQ_RESP,         query_srq},
> +    {PVRDMA_CMD_MODIFY_SRQ,   PVRDMA_CMD_MODIFY_SRQ_RESP,        modify_srq},
> +    {PVRDMA_CMD_DESTROY_SRQ,  PVRDMA_CMD_DESTROY_SRQ_RESP,       destroy_srq},
>  };
>  
>  int pvrdma_exec_cmd(PVRDMADev *dev)
> diff --git a/hw/rdma/vmw/pvrdma_main.c b/hw/rdma/vmw/pvrdma_main.c
> index 0b46561bad11..769f7990f864 100644
> --- a/hw/rdma/vmw/pvrdma_main.c
> +++ b/hw/rdma/vmw/pvrdma_main.c
> @@ -53,6 +53,7 @@ static Property pvrdma_dev_properties[] = {
>      DEFINE_PROP_INT32("dev-caps-max-qp-init-rd-atom", PVRDMADev,
>                        dev_attr.max_qp_init_rd_atom, MAX_QP_INIT_RD_ATOM),
>      DEFINE_PROP_INT32("dev-caps-max-ah", PVRDMADev, dev_attr.max_ah, MAX_AH),
> +    DEFINE_PROP_INT32("dev-caps-max-srq", PVRDMADev, dev_attr.max_srq, MAX_SRQ),
>      DEFINE_PROP_CHR("mad-chardev", PVRDMADev, mad_chr),
>      DEFINE_PROP_END_OF_LIST(),
>  };
> @@ -261,6 +262,9 @@ static void init_dsr_dev_caps(PVRDMADev *dev)
>      dsr->caps.max_mr = dev->dev_attr.max_mr;
>      dsr->caps.max_pd = dev->dev_attr.max_pd;
>      dsr->caps.max_ah = dev->dev_attr.max_ah;
> +    dsr->caps.max_srq = dev->dev_attr.max_srq;
> +    dsr->caps.max_srq_wr = dev->dev_attr.max_srq_wr;
> +    dsr->caps.max_srq_sge = dev->dev_attr.max_srq_sge;
>      dsr->caps.gid_tbl_len = MAX_GIDS;
>      dsr->caps.sys_image_guid = 0;
>      dsr->caps.node_guid = dev->node_guid;
> @@ -485,6 +489,13 @@ static void pvrdma_uar_write(void *opaque, hwaddr addr, uint64_t val,
>              pvrdma_cq_poll(&dev->rdma_dev_res, val & PVRDMA_UAR_HANDLE_MASK);
>          }
>          break;
> +    case PVRDMA_UAR_SRQ_OFFSET:
> +        if (val & PVRDMA_UAR_SRQ_RECV) {
> +            trace_pvrdma_uar_write(addr, val, "QP", "SRQ",
> +                                   val & PVRDMA_UAR_HANDLE_MASK, 0);
> +            pvrdma_srq_recv(dev, val & PVRDMA_UAR_HANDLE_MASK);
> +        }
> +        break;
>      default:
>          rdma_error_report("Unsupported command, addr=0x%"PRIx64", val=0x%"PRIx64,
>                            addr, val);
> @@ -554,6 +565,11 @@ static void init_dev_caps(PVRDMADev *dev)
>  
>      dev->dev_attr.max_cqe = pg_tbl_bytes / sizeof(struct pvrdma_cqe) -
>                              TARGET_PAGE_SIZE; /* First page is ring state */
> +
> +    dev->dev_attr.max_srq_wr = pg_tbl_bytes /
> +                                ((sizeof(struct pvrdma_rq_wqe_hdr) +
> +                                sizeof(struct pvrdma_sge)) *
> +                                dev->dev_attr.max_sge) - TARGET_PAGE_SIZE;
>  }
>  
>  static int pvrdma_check_ram_shared(Object *obj, void *opaque)
> diff --git a/hw/rdma/vmw/pvrdma_qp_ops.c b/hw/rdma/vmw/pvrdma_qp_ops.c
> index 5b9786efbe4b..bd6db858de32 100644
> --- a/hw/rdma/vmw/pvrdma_qp_ops.c
> +++ b/hw/rdma/vmw/pvrdma_qp_ops.c
> @@ -70,7 +70,7 @@ static int pvrdma_post_cqe(PVRDMADev *dev, uint32_t cq_handle,
>  
>      memset(cqe1, 0, sizeof(*cqe1));
>      cqe1->wr_id = cqe->wr_id;
> -    cqe1->qp = cqe->qp;
> +    cqe1->qp = cqe->qp ? cqe->qp : wc->qp_num;
>      cqe1->opcode = cqe->opcode;
>      cqe1->status = wc->status;
>      cqe1->byte_len = wc->byte_len;
> @@ -241,6 +241,50 @@ void pvrdma_qp_recv(PVRDMADev *dev, uint32_t qp_handle)
>      }
>  }
>  
> +void pvrdma_srq_recv(PVRDMADev *dev, uint32_t srq_handle)
> +{
> +    RdmaRmSRQ *srq;
> +    PvrdmaRqWqe *wqe;
> +    PvrdmaRing *ring;
> +
> +    srq = rdma_rm_get_srq(&dev->rdma_dev_res, srq_handle);
> +    if (unlikely(!srq)) {
> +        return;
> +    }
> +
> +    ring = (PvrdmaRing *)srq->opaque;
> +
> +    wqe = (struct PvrdmaRqWqe *)pvrdma_ring_next_elem_read(ring);
> +    while (wqe) {
> +        CompHandlerCtx *comp_ctx;
> +
> +        /* Prepare CQE */
> +        comp_ctx = g_malloc(sizeof(CompHandlerCtx));
> +        comp_ctx->dev = dev;
> +        comp_ctx->cq_handle = srq->recv_cq_handle;
> +        comp_ctx->cqe.wr_id = wqe->hdr.wr_id;
> +        comp_ctx->cqe.qp = 0;
> +        comp_ctx->cqe.opcode = IBV_WC_RECV;
> +
> +        if (wqe->hdr.num_sge > dev->dev_attr.max_sge) {
> +            rdma_error_report("Invalid num_sge=%d (max %d)", wqe->hdr.num_sge,
> +                              dev->dev_attr.max_sge);
> +            complete_with_error(VENDOR_ERR_INV_NUM_SGE, comp_ctx);
> +            continue;
> +        }
> +
> +        rdma_backend_post_srq_recv(&dev->backend_dev, &srq->backend_srq,
> +                                   (struct ibv_sge *)&wqe->sge[0],
> +                                   wqe->hdr.num_sge,
> +                                   comp_ctx);
> +
> +        pvrdma_ring_read_inc(ring);
> +
> +        wqe = pvrdma_ring_next_elem_read(ring);
> +    }
> +
> +}
> +
>  void pvrdma_cq_poll(RdmaDeviceResources *dev_res, uint32_t cq_handle)
>  {
>      RdmaRmCQ *cq;
> diff --git a/hw/rdma/vmw/pvrdma_qp_ops.h b/hw/rdma/vmw/pvrdma_qp_ops.h
> index 31cb48ba29f1..82e720a76fb4 100644
> --- a/hw/rdma/vmw/pvrdma_qp_ops.h
> +++ b/hw/rdma/vmw/pvrdma_qp_ops.h
> @@ -22,6 +22,7 @@ int pvrdma_qp_ops_init(void);
>  void pvrdma_qp_ops_fini(void);
>  void pvrdma_qp_send(PVRDMADev *dev, uint32_t qp_handle);
>  void pvrdma_qp_recv(PVRDMADev *dev, uint32_t qp_handle);
> +void pvrdma_srq_recv(PVRDMADev *dev, uint32_t srq_handle);
>  void pvrdma_cq_poll(RdmaDeviceResources *dev_res, uint32_t cq_handle);
>  
>  #endif

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

> -- 
> 2.20.1
> 
>