mirror of https://github.com/xemu-project/xemu.git
hw/rdma: Protect against concurrent execution of poll_cq
The function rdma_poll_cq is called from two contexts - completion handler thread which sense new completion on backend channel and explicitly as result of guest issuing poll_cq command. Add lock to protect against concurrent executions. Signed-off-by: Yuval Shaia <yuval.shaia@oracle.com> Reviewed-by: Marcel Apfelbaum <marcel.apfelbaum@gmail.com> Message-Id: <1552300155-25216-4-git-send-email-yuval.shaia@oracle.com> Reviewed-by: Kamal Heib <kamalheib1@gmail.com> Signed-off-by: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>
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@ -70,6 +70,7 @@ static void rdma_poll_cq(RdmaDeviceResources *rdma_dev_res, struct ibv_cq *ibcq)
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BackendCtx *bctx;
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BackendCtx *bctx;
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struct ibv_wc wc[2];
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struct ibv_wc wc[2];
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qemu_mutex_lock(&rdma_dev_res->lock);
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do {
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do {
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ne = ibv_poll_cq(ibcq, ARRAY_SIZE(wc), wc);
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ne = ibv_poll_cq(ibcq, ARRAY_SIZE(wc), wc);
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@ -89,6 +90,7 @@ static void rdma_poll_cq(RdmaDeviceResources *rdma_dev_res, struct ibv_cq *ibcq)
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g_free(bctx);
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g_free(bctx);
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}
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}
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} while (ne > 0);
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} while (ne > 0);
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qemu_mutex_unlock(&rdma_dev_res->lock);
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if (ne < 0) {
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if (ne < 0) {
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rdma_error_report("ibv_poll_cq fail, rc=%d, errno=%d", ne, errno);
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rdma_error_report("ibv_poll_cq fail, rc=%d, errno=%d", ne, errno);
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@ -617,12 +617,16 @@ int rdma_rm_init(RdmaDeviceResources *dev_res, struct ibv_device_attr *dev_attr)
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init_ports(dev_res);
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init_ports(dev_res);
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qemu_mutex_init(&dev_res->lock);
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return 0;
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return 0;
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}
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}
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void rdma_rm_fini(RdmaDeviceResources *dev_res, RdmaBackendDev *backend_dev,
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void rdma_rm_fini(RdmaDeviceResources *dev_res, RdmaBackendDev *backend_dev,
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const char *ifname)
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const char *ifname)
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{
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{
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qemu_mutex_destroy(&dev_res->lock);
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fini_ports(dev_res, backend_dev, ifname);
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fini_ports(dev_res, backend_dev, ifname);
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res_tbl_free(&dev_res->uc_tbl);
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res_tbl_free(&dev_res->uc_tbl);
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@ -105,6 +105,7 @@ typedef struct RdmaDeviceResources {
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RdmaRmResTbl cq_tbl;
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RdmaRmResTbl cq_tbl;
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RdmaRmResTbl cqe_ctx_tbl;
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RdmaRmResTbl cqe_ctx_tbl;
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GHashTable *qp_hash; /* Keeps mapping between real and emulated */
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GHashTable *qp_hash; /* Keeps mapping between real and emulated */
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QemuMutex lock;
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} RdmaDeviceResources;
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} RdmaDeviceResources;
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#endif
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#endif
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