From mboxrd@z Thu Jan 1 00:00:00 1970 From: Cunming Liang Subject: [PATCH v10 06/13] eal/linux: standalone intr event fd create support Date: Tue, 2 Jun 2015 14:53:19 +0800 Message-ID: <1433228006-24661-7-git-send-email-cunming.liang@intel.com> References: <1432889125-20255-1-git-send-email-cunming.liang@intel.com> <1433228006-24661-1-git-send-email-cunming.liang@intel.com> Cc: shemming@brocade.com, liang-min.wang@intel.com To: dev@dpdk.org Return-path: Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by dpdk.org (Postfix) with ESMTP id C75D0C34C for ; Tue, 2 Jun 2015 08:53:54 +0200 (CEST) In-Reply-To: <1433228006-24661-1-git-send-email-cunming.liang@intel.com> List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" The patch exposes intr event fd create and release for PMD. The device driver can assign the number of event associated with interrupt vector. It also provides misc funtions to check 1) allows other slowpath intr(e.g. lsc); 2) intr event on fastpath is enabled or not. Signed-off-by: Cunming Liang --- lib/librte_eal/linuxapp/eal/eal_interrupts.c | 57 ++++++++++++++++++++++ .../linuxapp/eal/include/exec-env/rte_interrupts.h | 51 +++++++++++++++++++ lib/librte_eal/linuxapp/eal/rte_eal_version.map | 4 ++ 3 files changed, 112 insertions(+) diff --git a/lib/librte_eal/linuxapp/eal/eal_interrupts.c b/lib/librte_eal/linuxapp/eal/eal_interrupts.c index 7fa5ba2..c2bf165 100644 --- a/lib/librte_eal/linuxapp/eal/eal_interrupts.c +++ b/lib/librte_eal/linuxapp/eal/eal_interrupts.c @@ -44,6 +44,7 @@ #include #include #include +#include #include #include @@ -68,6 +69,7 @@ #include "eal_vfio.h" #define EAL_INTR_EPOLL_WAIT_FOREVER (-1) +#define NB_OTHER_INTR 1 static RTE_DEFINE_PER_LCORE(int, _epfd) = -1; /**< epoll fd per thread */ @@ -1109,3 +1111,58 @@ rte_intr_rx_ctl(struct rte_intr_handle *intr_handle, int epfd, return rc; } + +int +rte_intr_efd_enable(struct rte_intr_handle *intr_handle, uint32_t nb_efd) +{ + uint32_t i; + int fd; + uint32_t n = RTE_MIN(nb_efd, (uint32_t)RTE_MAX_RXTX_INTR_VEC_ID); + + if (intr_handle->type == RTE_INTR_HANDLE_VFIO_MSIX) { + for (i = 0; i < n; i++) { + fd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC); + if (fd < 0) { + RTE_LOG(ERR, EAL, + "cannot setup eventfd," + "error %i (%s)\n", + errno, strerror(errno)); + return -1; + } + intr_handle->efds[i] = fd; + } + intr_handle->nb_efd = n; + intr_handle->max_intr = NB_OTHER_INTR + n; + } else { + intr_handle->efds[0] = intr_handle->fd; + intr_handle->nb_efd = RTE_MIN(nb_efd, 1U); + intr_handle->max_intr = NB_OTHER_INTR; + } + + return 0; +} + +void +rte_intr_efd_disable(struct rte_intr_handle *intr_handle) +{ + uint32_t i; + struct rte_epoll_event *rev; + + for (i = 0; i < intr_handle->nb_efd; i++) { + rev = &intr_handle->elist[i]; + if (rev->status == RTE_EPOLL_INVALID) + continue; + if (rte_epoll_ctl(rev->epfd, EPOLL_CTL_DEL, rev->fd, rev)) { + /* force free if the entry valid */ + eal_epoll_data_safe_free(rev); + rev->status = RTE_EPOLL_INVALID; + } + } + + if (intr_handle->max_intr > intr_handle->nb_efd) { + for (i = 0; i < intr_handle->nb_efd; i++) + close(intr_handle->efds[i]); + } + intr_handle->nb_efd = 0; + intr_handle->max_intr = 0; +} diff --git a/lib/librte_eal/linuxapp/eal/include/exec-env/rte_interrupts.h b/lib/librte_eal/linuxapp/eal/include/exec-env/rte_interrupts.h index 8b7793f..7c8a62b 100644 --- a/lib/librte_eal/linuxapp/eal/include/exec-env/rte_interrupts.h +++ b/lib/librte_eal/linuxapp/eal/include/exec-env/rte_interrupts.h @@ -166,4 +166,55 @@ int rte_intr_rx_ctl(struct rte_intr_handle *intr_handle, int epfd, int op, unsigned int vec, void *data); +/** + * It enables the fastpath event fds if it's necessary. + * It creates event fds when multi-vectors allowed, + * otherwise it multiplexes the single event fds. + * + * @param intr_handle + * Pointer to the interrupt handle. + * @param nb_vec + * Number of intrrupt vector trying to enable. + * @return + * - On success, zero. + * - On failure, a negative value. + */ +int +rte_intr_efd_enable(struct rte_intr_handle *intr_handle, uint32_t nb_efd); + +/** + * It disable the fastpath event fds. + * It deletes registered eventfds and closes the open fds. + * + * @param intr_handle + * Pointer to the interrupt handle. + */ +void +rte_intr_efd_disable(struct rte_intr_handle *intr_handle); + +/** + * The fastpath interrupt is enabled or not. + * + * @param intr_handle + * Pointer to the interrupt handle. + */ +static inline int +rte_intr_dp_is_en(struct rte_intr_handle *intr_handle) +{ + return !(!intr_handle->nb_efd); +} + +/** + * The interrupt handle instance allows other cause or not. + * Other cause stands for none fastpath interrupt. + * + * @param intr_handle + * Pointer to the interrupt handle. + */ +static inline int +rte_intr_allow_others(struct rte_intr_handle *intr_handle) +{ + return !!(intr_handle->max_intr - intr_handle->nb_efd); +} + #endif /* _RTE_LINUXAPP_INTERRUPTS_H_ */ diff --git a/lib/librte_eal/linuxapp/eal/rte_eal_version.map b/lib/librte_eal/linuxapp/eal/rte_eal_version.map index 65b5ed2..d0df6b4 100644 --- a/lib/librte_eal/linuxapp/eal/rte_eal_version.map +++ b/lib/librte_eal/linuxapp/eal/rte_eal_version.map @@ -61,7 +61,11 @@ DPDK_2.0 { rte_hexdump; rte_intr_callback_register; rte_intr_callback_unregister; + rte_intr_allow_others; rte_intr_disable; + rte_intr_dp_is_en; + rte_intr_efd_enable; + rte_intr_efd_disable; rte_intr_enable; rte_intr_rx_ctl; rte_intr_tls_epfd; -- 1.8.1.4