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Thu, 25 May 2023 05:08:46 -0500 From: Nipun Gupta To: , , , , , CC: , , , Nipun Gupta Subject: [PATCH v5 4/5] bus/cdx: add support for MSI Date: Thu, 25 May 2023 15:38:20 +0530 Message-ID: <20230525100821.12148-5-nipun.gupta@amd.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20230525100821.12148-1-nipun.gupta@amd.com> References: <20230124140746.594066-1-nipun.gupta@amd.com> <20230525100821.12148-1-nipun.gupta@amd.com> MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1NAM11FT084:EE_|IA1PR12MB6258:EE_ X-MS-Office365-Filtering-Correlation-Id: 4da0018c-3ee1-468a-cd20-08db5d080fd9 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17; CTRY:US; LANG:en; SCL:1; SRV:; IPV:CAL; SFV:NSPM; H:SATLEXMB03.amd.com; PTR:InfoDomainNonexistent; CAT:NONE; SFS:(13230028)(4636009)(396003)(376002)(346002)(136003)(39860400002)(451199021)(40470700004)(46966006)(36840700001)(478600001)(1076003)(82310400005)(54906003)(2616005)(26005)(186003)(6666004)(426003)(336012)(356005)(81166007)(82740400003)(40460700003)(4326008)(47076005)(83380400001)(36756003)(110136005)(8676002)(316002)(30864003)(44832011)(2906002)(70586007)(70206006)(8936002)(5660300002)(41300700001)(36860700001)(40480700001)(86362001)(36900700001); DIR:OUT; SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 25 May 2023 10:09:00.8548 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 4da0018c-3ee1-468a-cd20-08db5d080fd9 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d; Ip=[165.204.84.17]; Helo=[SATLEXMB03.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CO1NAM11FT084.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR12MB6258 X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org MSI's are exposed to the devices using VFIO (vfio-cdx). This patch uses the same to add support for MSI for the devices on the cdx bus. A couple of API's have been introduced in the EAL interrupt framework: - rte_intr_irq_count_set: This API is used to set the total interrupts on the interrupt handle. This would be provided by VFIO (irq.count) for VFIO enabled devices. - rte_intr_irq_count_get: This API returns the total number interrupts which were set. Signed-off-by: Nipun Gupta Acked-by: Ferruh Yigit --- drivers/bus/cdx/bus_cdx_driver.h | 25 +++++ drivers/bus/cdx/cdx.c | 11 ++ drivers/bus/cdx/cdx_vfio.c | 182 ++++++++++++++++++++++++++++++- drivers/bus/cdx/version.map | 2 + 4 files changed, 218 insertions(+), 2 deletions(-) diff --git a/drivers/bus/cdx/bus_cdx_driver.h b/drivers/bus/cdx/bus_cdx_driver.h index f1dce06a16..a8c54d728e 100644 --- a/drivers/bus/cdx/bus_cdx_driver.h +++ b/drivers/bus/cdx/bus_cdx_driver.h @@ -67,6 +67,7 @@ struct rte_cdx_device { struct rte_cdx_id id; /**< CDX ID. */ struct rte_mem_resource mem_resource[CDX_MAX_RESOURCE]; /**< CDX Memory Resource */ + struct rte_intr_handle *intr_handle; /**< Interrupt handle */ }; /** @@ -168,6 +169,30 @@ void rte_cdx_unmap_device(struct rte_cdx_device *dev); __rte_internal void rte_cdx_register(struct rte_cdx_driver *driver); +/** + * Enables VFIO Interrupts for CDX bus devices. + * + * @param intr_handle + * Pointer to the interrupt handle. + * + * @return + * 0 on success, -1 on error. + */ +__rte_internal +int rte_cdx_vfio_intr_enable(const struct rte_intr_handle *intr_handle); + +/** + * Disable VFIO Interrupts for CDX bus devices. + * + * @param intr_handle + * Pointer to the interrupt handle. + * + * @return + * 0 on success, -1 on error. + */ +__rte_internal +int rte_cdx_vfio_intr_disable(const struct rte_intr_handle *intr_handle); + /** * Helper for CDX device registration from driver (eth, crypto, raw) instance */ diff --git a/drivers/bus/cdx/cdx.c b/drivers/bus/cdx/cdx.c index 64ea879f3b..c691c38e04 100644 --- a/drivers/bus/cdx/cdx.c +++ b/drivers/bus/cdx/cdx.c @@ -201,6 +201,15 @@ cdx_scan_one(const char *dirname, const char *dev_name) goto err; } + /* Allocate interrupt instance for cdx device */ + dev->intr_handle = + rte_intr_instance_alloc(RTE_INTR_INSTANCE_F_PRIVATE); + if (dev->intr_handle == NULL) { + CDX_BUS_ERR("Failed to create interrupt instance for %s\n", + dev->device.name); + return -ENOMEM; + } + /* * Check if device is bound to 'vfio-cdx' driver, so that user-space * can gracefully access the device. @@ -391,6 +400,8 @@ cdx_probe_one_driver(struct rte_cdx_driver *dr, return ret; error_probe: + rte_intr_instance_free(dev->intr_handle); + dev->intr_handle = NULL; cdx_vfio_unmap_resource(dev); error_map_device: return ret; diff --git a/drivers/bus/cdx/cdx_vfio.c b/drivers/bus/cdx/cdx_vfio.c index e54432de5b..ec6512e158 100644 --- a/drivers/bus/cdx/cdx_vfio.c +++ b/drivers/bus/cdx/cdx_vfio.c @@ -50,6 +50,10 @@ struct mapped_cdx_resource { /** mapped cdx device list */ TAILQ_HEAD(mapped_cdx_res_list, mapped_cdx_resource); +/* IRQ set buffer length for MSI interrupts */ +#define MSI_IRQ_SET_BUF_LEN (sizeof(struct vfio_irq_set) + \ + sizeof(int) * (RTE_MAX_RXTX_INTR_VEC_ID + 1)) + static struct rte_tailq_elem cdx_vfio_tailq = { .name = "VFIO_CDX_RESOURCE_LIST", }; @@ -94,6 +98,27 @@ cdx_vfio_unmap_resource_primary(struct rte_cdx_device *dev) char cdx_addr[PATH_MAX] = {0}; struct mapped_cdx_resource *vfio_res = NULL; struct mapped_cdx_res_list *vfio_res_list; + int ret, vfio_dev_fd; + + if (rte_intr_fd_get(dev->intr_handle) < 0) + return -1; + + if (close(rte_intr_fd_get(dev->intr_handle)) < 0) { + CDX_BUS_ERR("Error when closing eventfd file descriptor for %s", + dev->device.name); + return -1; + } + + vfio_dev_fd = rte_intr_dev_fd_get(dev->intr_handle); + if (vfio_dev_fd < 0) + return -1; + + ret = rte_vfio_release_device(rte_cdx_get_sysfs_path(), dev->device.name, + vfio_dev_fd); + if (ret < 0) { + CDX_BUS_ERR("Cannot release VFIO device"); + return ret; + } vfio_res_list = RTE_TAILQ_CAST(cdx_vfio_tailq.head, mapped_cdx_res_list); @@ -116,6 +141,18 @@ cdx_vfio_unmap_resource_secondary(struct rte_cdx_device *dev) { struct mapped_cdx_resource *vfio_res = NULL; struct mapped_cdx_res_list *vfio_res_list; + int ret, vfio_dev_fd; + + vfio_dev_fd = rte_intr_dev_fd_get(dev->intr_handle); + if (vfio_dev_fd < 0) + return -1; + + ret = rte_vfio_release_device(rte_cdx_get_sysfs_path(), dev->device.name, + vfio_dev_fd); + if (ret < 0) { + CDX_BUS_ERR("Cannot release VFIO device"); + return ret; + } vfio_res_list = RTE_TAILQ_CAST(cdx_vfio_tailq.head, mapped_cdx_res_list); @@ -140,9 +177,80 @@ cdx_vfio_unmap_resource(struct rte_cdx_device *dev) return cdx_vfio_unmap_resource_secondary(dev); } +/* set up interrupt support (but not enable interrupts) */ static int -cdx_rte_vfio_setup_device(int vfio_dev_fd) +cdx_vfio_setup_interrupts(struct rte_cdx_device *dev, int vfio_dev_fd, + int num_irqs) { + int i, ret; + + if (num_irqs == 0) + return 0; + + /* start from MSI interrupt type */ + for (i = 0; i < num_irqs; i++) { + struct vfio_irq_info irq = { .argsz = sizeof(irq) }; + int fd = -1; + + irq.index = i; + + ret = ioctl(vfio_dev_fd, VFIO_DEVICE_GET_IRQ_INFO, &irq); + if (ret < 0) { + CDX_BUS_ERR("Cannot get VFIO IRQ info, error %i (%s)", + errno, strerror(errno)); + return -1; + } + + /* if this vector cannot be used with eventfd, fail if we explicitly + * specified interrupt type, otherwise continue + */ + if ((irq.flags & VFIO_IRQ_INFO_EVENTFD) == 0) + continue; + + if (rte_intr_irq_count_set(dev->intr_handle, irq.count)) + return -1; + + /* Reallocate the efds and elist fields of intr_handle based + * on CDX device MSI size. + */ + if ((uint32_t)rte_intr_nb_intr_get(dev->intr_handle) < irq.count && + rte_intr_event_list_update(dev->intr_handle, irq.count)) + return -1; + + /* set up an eventfd for interrupts */ + fd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC); + if (fd < 0) { + CDX_BUS_ERR("Cannot set up eventfd, error %i (%s)", + errno, strerror(errno)); + return -1; + } + + if (rte_intr_fd_set(dev->intr_handle, fd)) + return -1; + + /* DPDK CDX bus currently supports only MSI-X */ + if (rte_intr_type_set(dev->intr_handle, RTE_INTR_HANDLE_VFIO_MSIX)) + return -1; + + if (rte_intr_dev_fd_set(dev->intr_handle, vfio_dev_fd)) + return -1; + + return 0; + } + + /* if we're here, we haven't found a suitable interrupt vector */ + return -1; +} + +static int +cdx_vfio_setup_device(struct rte_cdx_device *dev, int vfio_dev_fd, + int num_irqs) +{ + if (cdx_vfio_setup_interrupts(dev, vfio_dev_fd, num_irqs) != 0) { + CDX_BUS_ERR("Error setting up interrupts!"); + return -1; + } + /* * Reset the device. If the device is not capable of resetting, * then it updates errno as EINVAL. @@ -278,6 +386,9 @@ cdx_vfio_map_resource_primary(struct rte_cdx_device *dev) struct cdx_map *maps; int vfio_dev_fd, i, ret; + if (rte_intr_fd_set(dev->intr_handle, -1)) + return -1; + ret = rte_vfio_setup_device(rte_cdx_get_sysfs_path(), dev_name, &vfio_dev_fd, &device_info); if (ret) @@ -343,7 +454,7 @@ cdx_vfio_map_resource_primary(struct rte_cdx_device *dev) free(reg); } - if (cdx_rte_vfio_setup_device(vfio_dev_fd) < 0) { + if (cdx_vfio_setup_device(dev, vfio_dev_fd, device_info.num_irqs) < 0) { CDX_BUS_ERR("%s setup device failed", dev_name); goto err_vfio_res; } @@ -373,6 +484,9 @@ cdx_vfio_map_resource_secondary(struct rte_cdx_device *dev) const char *dev_name = dev->device.name; struct cdx_map *maps; + if (rte_intr_fd_set(dev->intr_handle, -1)) + return -1; + /* if we're in a secondary process, just find our tailq entry */ TAILQ_FOREACH(vfio_res, vfio_res_list, next) { if (strcmp(vfio_res->name, dev_name)) @@ -406,6 +520,10 @@ cdx_vfio_map_resource_secondary(struct rte_cdx_device *dev) dev->mem_resource[i].len = maps[i].size; } + /* we need save vfio_dev_fd, so it can be used during release */ + if (rte_intr_dev_fd_set(dev->intr_handle, vfio_dev_fd)) + goto err_vfio_dev_fd; + return 0; err_vfio_dev_fd: rte_vfio_release_device(rte_cdx_get_sysfs_path(), @@ -425,3 +543,63 @@ cdx_vfio_map_resource(struct rte_cdx_device *dev) else return cdx_vfio_map_resource_secondary(dev); } + +int +rte_cdx_vfio_intr_enable(const struct rte_intr_handle *intr_handle) +{ + char irq_set_buf[MSI_IRQ_SET_BUF_LEN]; + struct vfio_irq_set *irq_set; + int *fd_ptr, vfio_dev_fd, i; + int ret; + + irq_set = (struct vfio_irq_set *) irq_set_buf; + irq_set->count = rte_intr_irq_count_get(intr_handle); + irq_set->argsz = sizeof(struct vfio_irq_set) + + (sizeof(int) * irq_set->count); + + irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_TRIGGER; + irq_set->index = 0; + irq_set->start = 0; + fd_ptr = (int *) &irq_set->data; + + for (i = 0; i < rte_intr_nb_efd_get(intr_handle); i++) + fd_ptr[i] = rte_intr_efds_index_get(intr_handle, i); + + vfio_dev_fd = rte_intr_dev_fd_get(intr_handle); + ret = ioctl(vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set); + + if (ret) { + CDX_BUS_ERR("Error enabling MSI interrupts for fd %d", + rte_intr_fd_get(intr_handle)); + return -1; + } + + return 0; +} + +/* disable MSI interrupts */ +int +rte_cdx_vfio_intr_disable(const struct rte_intr_handle *intr_handle) +{ + struct vfio_irq_set *irq_set; + char irq_set_buf[MSI_IRQ_SET_BUF_LEN]; + int len, ret, vfio_dev_fd; + + len = sizeof(struct vfio_irq_set); + + irq_set = (struct vfio_irq_set *) irq_set_buf; + irq_set->argsz = len; + irq_set->count = 0; + irq_set->flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_TRIGGER; + irq_set->index = 0; + irq_set->start = 0; + + vfio_dev_fd = rte_intr_dev_fd_get(intr_handle); + ret = ioctl(vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set); + + if (ret) + CDX_BUS_ERR("Error disabling MSI interrupts for fd %d", + rte_intr_fd_get(intr_handle)); + + return ret; +} diff --git a/drivers/bus/cdx/version.map b/drivers/bus/cdx/version.map index 957fcab978..2f3d484ebd 100644 --- a/drivers/bus/cdx/version.map +++ b/drivers/bus/cdx/version.map @@ -6,6 +6,8 @@ INTERNAL { rte_cdx_register; rte_cdx_unmap_device; rte_cdx_unregister; + rte_cdx_vfio_intr_disable; + rte_cdx_vfio_intr_enable; local: *; };