hw/rdma/vmw/pvrdma_qp_ops.c

   1 /*
   2  * QEMU paravirtual RDMA - QP implementation
   3  *
   4  * Copyright (C) 2018 Oracle
   5  * Copyright (C) 2018 Red Hat Inc
   6  *
   7  * Authors:
   8  *     Yuval Shaia <yuval.shaia@oracle.com>
   9  *     Marcel Apfelbaum <marcel@redhat.com>
  10  *
  11  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  12  * See the COPYING file in the top-level directory.
  13  *
  14  */
  15
  16 #include "qemu/osdep.h"
  17
  18 #include "../rdma_utils.h"
  19 #include "../rdma_rm.h"
  20 #include "../rdma_backend.h"
  21
  22 #include "pvrdma.h"
  23 #include "standard-headers/rdma/vmw_pvrdma-abi.h"
  24 #include "pvrdma_qp_ops.h"
  25
  26 typedef struct CompHandlerCtx {
  27     PVRDMADev *dev;
  28     uint32_t cq_handle;
  29     struct pvrdma_cqe cqe;
  30 } CompHandlerCtx;
  31
  32 /* Send Queue WQE */
  33 typedef struct PvrdmaSqWqe {
  34     struct pvrdma_sq_wqe_hdr hdr;
  35     struct pvrdma_sge sge[0];
  36 } PvrdmaSqWqe;
  37
  38 /* Recv Queue WQE */
  39 typedef struct PvrdmaRqWqe {
  40     struct pvrdma_rq_wqe_hdr hdr;
  41     struct pvrdma_sge sge[0];
  42 } PvrdmaRqWqe;
  43
  44 /*
  45  * 1. Put CQE on send CQ ring
  46  * 2. Put CQ number on dsr completion ring
  47  * 3. Interrupt host
  48  */
  49 static int pvrdma_post_cqe(PVRDMADev *dev, uint32_t cq_handle,
  50                            struct pvrdma_cqe *cqe, struct ibv_wc *wc)
  51 {
  52     struct pvrdma_cqe *cqe1;
  53     struct pvrdma_cqne *cqne;
  54     PvrdmaRing *ring;
  55     RdmaRmCQ *cq = rdma_rm_get_cq(&dev->rdma_dev_res, cq_handle);
  56
  57     if (unlikely(!cq)) {
  58         pr_dbg("Invalid cqn %d\n", cq_handle);
  59         return -EINVAL;
  60     }
  61
  62     ring = (PvrdmaRing *)cq->opaque;
  63     pr_dbg("ring=%p\n", ring);
  64
  65     /* Step #1: Put CQE on CQ ring */
  66     pr_dbg("Writing CQE\n");
  67     cqe1 = pvrdma_ring_next_elem_write(ring);
  68     if (unlikely(!cqe1)) {
  69         pr_dbg("No CQEs in ring\n");
  70         return -EINVAL;
  71     }
  72
  73     memset(cqe1, 0, sizeof(*cqe1));
  74     cqe1->wr_id = cqe->wr_id;
  75     cqe1->qp = cqe->qp;
  76     cqe1->opcode = cqe->opcode;
  77     cqe1->status = wc->status;
  78     cqe1->byte_len = wc->byte_len;
  79     cqe1->src_qp = wc->src_qp;
  80     cqe1->wc_flags = wc->wc_flags;
  81     cqe1->vendor_err = wc->vendor_err;
  82
  83     pr_dbg("wr_id=%" PRIx64 "\n", cqe1->wr_id);
  84     pr_dbg("qp=0x%lx\n", cqe1->qp);
  85     pr_dbg("opcode=%d\n", cqe1->opcode);
  86     pr_dbg("status=%d\n", cqe1->status);
  87     pr_dbg("byte_len=%d\n", cqe1->byte_len);
  88     pr_dbg("src_qp=%d\n", cqe1->src_qp);
  89     pr_dbg("wc_flags=%d\n", cqe1->wc_flags);
  90     pr_dbg("vendor_err=%d\n", cqe1->vendor_err);
  91
  92     pvrdma_ring_write_inc(ring);
  93
  94     /* Step #2: Put CQ number on dsr completion ring */
  95     pr_dbg("Writing CQNE\n");
  96     cqne = pvrdma_ring_next_elem_write(&dev->dsr_info.cq);
  97     if (unlikely(!cqne)) {
  98         return -EINVAL;
  99     }
 100
 101     cqne->info = cq_handle;
 102     pvrdma_ring_write_inc(&dev->dsr_info.cq);
 103
 104     pr_dbg("cq->notify=%d\n", cq->notify);
 105     if (cq->notify != CNT_CLEAR) {
 106         if (cq->notify == CNT_ARM) {
 107             cq->notify = CNT_CLEAR;
 108         }
 109         post_interrupt(dev, INTR_VEC_CMD_COMPLETION_Q);
 110     }
 111
 112     return 0;
 113 }
 114
 115 static void pvrdma_qp_ops_comp_handler(void *ctx, struct ibv_wc *wc)
 116 {
 117     CompHandlerCtx *comp_ctx = (CompHandlerCtx *)ctx;
 118
 119     pvrdma_post_cqe(comp_ctx->dev, comp_ctx->cq_handle, &comp_ctx->cqe, wc);
 120
 121     g_free(ctx);
 122 }
 123
 124 void pvrdma_qp_ops_fini(void)
 125 {
 126     rdma_backend_unregister_comp_handler();
 127 }
 128
 129 int pvrdma_qp_ops_init(void)
 130 {
 131     rdma_backend_register_comp_handler(pvrdma_qp_ops_comp_handler);
 132
 133     return 0;
 134 }
 135
 136 int pvrdma_qp_send(PVRDMADev *dev, uint32_t qp_handle)
 137 {
 138     RdmaRmQP *qp;
 139     PvrdmaSqWqe *wqe;
 140     PvrdmaRing *ring;
 141     int sgid_idx;
 142     union ibv_gid *sgid;
 143
 144     pr_dbg("qp_handle=0x%x\n", qp_handle);
 145
 146     qp = rdma_rm_get_qp(&dev->rdma_dev_res, qp_handle);
 147     if (unlikely(!qp)) {
 148         return -EINVAL;
 149     }
 150
 151     ring = (PvrdmaRing *)qp->opaque;
 152     pr_dbg("sring=%p\n", ring);
 153
 154     wqe = (struct PvrdmaSqWqe *)pvrdma_ring_next_elem_read(ring);
 155     while (wqe) {
 156         CompHandlerCtx *comp_ctx;
 157
 158         pr_dbg("wr_id=%" PRIx64 "\n", wqe->hdr.wr_id);
 159
 160         /* Prepare CQE */
 161         comp_ctx = g_malloc(sizeof(CompHandlerCtx));
 162         comp_ctx->dev = dev;
 163         comp_ctx->cq_handle = qp->send_cq_handle;
 164         comp_ctx->cqe.wr_id = wqe->hdr.wr_id;
 165         comp_ctx->cqe.qp = qp_handle;
 166         comp_ctx->cqe.opcode = IBV_WC_SEND;
 167
 168         sgid = rdma_rm_get_gid(&dev->rdma_dev_res, wqe->hdr.wr.ud.av.gid_index);
 169         if (!sgid) {
 170             pr_dbg("Fail to get gid for idx %d\n", wqe->hdr.wr.ud.av.gid_index);
 171             return -EIO;
 172         }
 173         pr_dbg("sgid_id=%d, sgid=0x%llx\n", wqe->hdr.wr.ud.av.gid_index,
 174                sgid->global.interface_id);
 175
 176         sgid_idx = rdma_rm_get_backend_gid_index(&dev->rdma_dev_res,
 177                                                  &dev->backend_dev,
 178                                                  wqe->hdr.wr.ud.av.gid_index);
 179         if (sgid_idx <= 0) {
 180             pr_dbg("Fail to get bk sgid_idx for sgid_idx %d\n",
 181                    wqe->hdr.wr.ud.av.gid_index);
 182             return -EIO;
 183         }
 184
 185         rdma_backend_post_send(&dev->backend_dev, &qp->backend_qp, qp->qp_type,
 186                                (struct ibv_sge *)&wqe->sge[0], wqe->hdr.num_sge,
 187                                sgid_idx, sgid,
 188                                (union ibv_gid *)wqe->hdr.wr.ud.av.dgid,
 189                                wqe->hdr.wr.ud.remote_qpn,
 190                                wqe->hdr.wr.ud.remote_qkey, comp_ctx);
 191
 192         pvrdma_ring_read_inc(ring);
 193
 194         wqe = pvrdma_ring_next_elem_read(ring);
 195     }
 196
 197     return 0;
 198 }
 199
 200 int pvrdma_qp_recv(PVRDMADev *dev, uint32_t qp_handle)
 201 {
 202     RdmaRmQP *qp;
 203     PvrdmaRqWqe *wqe;
 204     PvrdmaRing *ring;
 205
 206     pr_dbg("qp_handle=0x%x\n", qp_handle);
 207
 208     qp = rdma_rm_get_qp(&dev->rdma_dev_res, qp_handle);
 209     if (unlikely(!qp)) {
 210         return -EINVAL;
 211     }
 212
 213     ring = &((PvrdmaRing *)qp->opaque)[1];
 214     pr_dbg("rring=%p\n", ring);
 215
 216     wqe = (struct PvrdmaRqWqe *)pvrdma_ring_next_elem_read(ring);
 217     while (wqe) {
 218         CompHandlerCtx *comp_ctx;
 219
 220         pr_dbg("wr_id=%" PRIx64 "\n", wqe->hdr.wr_id);
 221
 222         /* Prepare CQE */
 223         comp_ctx = g_malloc(sizeof(CompHandlerCtx));
 224         comp_ctx->dev = dev;
 225         comp_ctx->cq_handle = qp->recv_cq_handle;
 226         comp_ctx->cqe.wr_id = wqe->hdr.wr_id;
 227         comp_ctx->cqe.qp = qp_handle;
 228         comp_ctx->cqe.opcode = IBV_WC_RECV;
 229
 230         rdma_backend_post_recv(&dev->backend_dev, &dev->rdma_dev_res,
 231                                &qp->backend_qp, qp->qp_type,
 232                                (struct ibv_sge *)&wqe->sge[0], wqe->hdr.num_sge,
 233                                comp_ctx);
 234
 235         pvrdma_ring_read_inc(ring);
 236
 237         wqe = pvrdma_ring_next_elem_read(ring);
 238     }
 239
 240     return 0;
 241 }
 242
 243 void pvrdma_cq_poll(RdmaDeviceResources *dev_res, uint32_t cq_handle)
 244 {
 245     RdmaRmCQ *cq;
 246
 247     cq = rdma_rm_get_cq(dev_res, cq_handle);
 248     if (!cq) {
 249         pr_dbg("Invalid CQ# %d\n", cq_handle);
 250         return;
 251     }
 252
 253     rdma_backend_poll_cq(dev_res, &cq->backend_cq);
 254 }