From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by inbox.dpdk.org (Postfix) with ESMTP id B3ED9A0531; Wed, 29 Jan 2020 11:11:38 +0100 (CET) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 54A861C01B; Wed, 29 Jan 2020 11:10:27 +0100 (CET) Received: from mellanox.co.il (mail-il-dmz.mellanox.com [193.47.165.129]) by dpdk.org (Postfix) with ESMTP id 5E8031BFB1 for ; Wed, 29 Jan 2020 11:10:24 +0100 (CET) Received: from Internal Mail-Server by MTLPINE1 (envelope-from asafp@mellanox.com) with ESMTPS (AES256-SHA encrypted); 29 Jan 2020 12:10:20 +0200 Received: from pegasus07.mtr.labs.mlnx (pegasus07.mtr.labs.mlnx [10.210.16.112]) by labmailer.mlnx (8.13.8/8.13.8) with ESMTP id 00TA9BHQ032108; Wed, 29 Jan 2020 12:10:20 +0200 From: Matan Azrad To: dev@dpdk.org, Viacheslav Ovsiienko Cc: Maxime Coquelin Date: Wed, 29 Jan 2020 10:09:06 +0000 Message-Id: <1580292549-27439-11-git-send-email-matan@mellanox.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1580292549-27439-1-git-send-email-matan@mellanox.com> References: <1579539790-3882-1-git-send-email-matan@mellanox.com> <1580292549-27439-1-git-send-email-matan@mellanox.com> Subject: [dpdk-dev] [PATCH v2 10/13] vdpa/mlx5: map doorbell X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" The HW supports only 4 bytes doorbell writing detection. The virtio device set only 2 bytes when it rings the doorbell. Map the virtio doorbell detected by the virtio queue kickfd to the HW VAR space when it expects to get the virtio emulation doorbell. Use the EAL interrupt mechanism to get notification when a new event appears in kickfd by the guest and write 4 bytes to the HW doorbell space in the notification callback. Signed-off-by: Matan Azrad Acked-by: Viacheslav Ovsiienko --- drivers/vdpa/mlx5/mlx5_vdpa.h | 3 ++ drivers/vdpa/mlx5/mlx5_vdpa_virtq.c | 82 ++++++++++++++++++++++++++++++++++++- 2 files changed, 84 insertions(+), 1 deletion(-) diff --git a/drivers/vdpa/mlx5/mlx5_vdpa.h b/drivers/vdpa/mlx5/mlx5_vdpa.h index 383a33e..af78ea1 100644 --- a/drivers/vdpa/mlx5/mlx5_vdpa.h +++ b/drivers/vdpa/mlx5/mlx5_vdpa.h @@ -75,6 +75,7 @@ struct mlx5_vdpa_virtq { void *buf; uint32_t size; } umems[3]; + struct rte_intr_handle intr_handle; }; struct mlx5_vdpa_steer { @@ -112,6 +113,8 @@ struct mlx5_vdpa_priv { uint16_t log_max_rqt_size; SLIST_HEAD(virtq_list, mlx5_vdpa_virtq) virtq_list; struct mlx5_vdpa_steer steer; + struct mlx5dv_var *var; + void *virtq_db_addr; SLIST_HEAD(mr_list, mlx5_vdpa_query_mr) mr_list; }; diff --git a/drivers/vdpa/mlx5/mlx5_vdpa_virtq.c b/drivers/vdpa/mlx5/mlx5_vdpa_virtq.c index 60aa040..91347e9 100644 --- a/drivers/vdpa/mlx5/mlx5_vdpa_virtq.c +++ b/drivers/vdpa/mlx5/mlx5_vdpa_virtq.c @@ -2,9 +2,12 @@ * Copyright 2019 Mellanox Technologies, Ltd */ #include +#include +#include #include #include +#include #include @@ -12,11 +15,52 @@ #include "mlx5_vdpa.h" +static void +mlx5_vdpa_virtq_handler(void *cb_arg) +{ + struct mlx5_vdpa_virtq *virtq = cb_arg; + struct mlx5_vdpa_priv *priv = virtq->priv; + uint64_t buf; + int nbytes; + + do { + nbytes = read(virtq->intr_handle.fd, &buf, 8); + if (nbytes < 0) { + if (errno == EINTR || + errno == EWOULDBLOCK || + errno == EAGAIN) + continue; + DRV_LOG(ERR, "Failed to read kickfd of virtq %d: %s", + virtq->index, strerror(errno)); + } + break; + } while (1); + rte_write32(virtq->index, priv->virtq_db_addr); + DRV_LOG(DEBUG, "Ring virtq %u doorbell.", virtq->index); +} + static int mlx5_vdpa_virtq_unset(struct mlx5_vdpa_virtq *virtq) { - unsigned int; + unsigned int i; + int retries = MLX5_VDPA_INTR_RETRIES; + int ret = -EAGAIN; + if (virtq->intr_handle.fd) { + while (retries-- && ret == -EAGAIN) { + ret = rte_intr_callback_unregister(&virtq->intr_handle, + mlx5_vdpa_virtq_handler, + virtq); + if (ret == -EAGAIN) { + DRV_LOG(DEBUG, "Try again to unregister fd %d " + "of virtq %d interrupt, retries = %d.", + virtq->intr_handle.fd, + (int)virtq->index, retries); + usleep(MLX5_VDPA_INTR_RETRIES_USEC); + } + } + memset(&virtq->intr_handle, 0, sizeof(virtq->intr_handle)); + } if (virtq->virtq) { claim_zero(mlx5_devx_cmd_destroy(virtq->virtq)); virtq->virtq = NULL; @@ -57,6 +101,14 @@ claim_zero(mlx5_devx_cmd_destroy(priv->td)); priv->td = NULL; } + if (priv->virtq_db_addr) { + claim_zero(munmap(priv->virtq_db_addr, priv->var->length)); + priv->virtq_db_addr = NULL; + } + if (priv->var) { + mlx5_glue->dv_free_var(priv->var); + priv->var = NULL; + } priv->features = 0; } @@ -201,6 +253,17 @@ if (mlx5_vdpa_virtq_modify(virtq, 1)) goto error; virtq->enable = 1; + virtq->intr_handle.fd = vq.kickfd; + virtq->intr_handle.type = RTE_INTR_HANDLE_EXT; + if (rte_intr_callback_register(&virtq->intr_handle, + mlx5_vdpa_virtq_handler, virtq)) { + virtq->intr_handle.fd = 0; + DRV_LOG(ERR, "Failed to register virtq %d interrupt.", index); + goto error; + } else { + DRV_LOG(DEBUG, "Register fd %d interrupt for virtq %d.", + virtq->intr_handle.fd, index); + } return 0; error: mlx5_vdpa_virtq_unset(virtq); @@ -275,6 +338,23 @@ DRV_LOG(ERR, "Failed to configure negotiated features."); return -1; } + priv->var = mlx5_glue->dv_alloc_var(priv->ctx, 0); + if (!priv->var) { + DRV_LOG(ERR, "Failed to allocate VAR %u.\n", errno); + return -1; + } + /* Always map the entire page. */ + priv->virtq_db_addr = mmap(NULL, priv->var->length, PROT_READ | + PROT_WRITE, MAP_SHARED, priv->ctx->cmd_fd, + priv->var->mmap_off); + if (priv->virtq_db_addr == MAP_FAILED) { + DRV_LOG(ERR, "Failed to map doorbell page %u.", errno); + priv->virtq_db_addr = NULL; + goto error; + } else { + DRV_LOG(DEBUG, "VAR address of doorbell mapping is %p.", + priv->virtq_db_addr); + } priv->td = mlx5_devx_cmd_create_td(priv->ctx); if (!priv->td) { DRV_LOG(ERR, "Failed to create transport domain."); -- 1.8.3.1