From e2195ac505bd423d3d2f973bbe94da1c78296aa6 Mon Sep 17 00:00:00 2001 From: Alex Williams Date: Fri, 31 Aug 2018 11:35:07 -0700 Subject: transport: Add blocking recv calls to uhd-dpdk This adds an internal wait queue API to uhd-dpdk. Socket configuration requests had their blocking calls re-implemented on top of this API, and it is also used to service requests to wait on RX packets (w/ timeout). The wait API involves a multi-producer, single-consumer queue per I/O thread (waiter_ring), with a condition variable used for sleeping. The data structure is shared between user thread and I/O thread, and because timeouts make resource release time non-deterministic, we use reference counting on the shared resource. One reference is generated by the user thread and passed to the I/O thread to consume. A user thread that still needs the data after waking must get() another reference, to postpone the destruction of the resource until it is done. Timeouts are based on CLOCK_MONOTONIC. For recv, a timeout of 0 indicates blocking indefinitely, and a negative timeout indicates no timeout is desired. Also drop timeout for closing sockets in uhd-dpdk. The timeout would allow a user thread to pre-empt the I/O thread's cleanup process. The user thread would free data structures the I/O thread still needed to function. Since this timeout is superfluous anyway, let's just get rid of it. Also add some more input checking and error reporting. --- host/lib/transport/uhd-dpdk/uhd_dpdk_fops.h | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'host/lib/transport/uhd-dpdk/uhd_dpdk_fops.h') diff --git a/host/lib/transport/uhd-dpdk/uhd_dpdk_fops.h b/host/lib/transport/uhd-dpdk/uhd_dpdk_fops.h index c07c1913a..66adb0f54 100644 --- a/host/lib/transport/uhd-dpdk/uhd_dpdk_fops.h +++ b/host/lib/transport/uhd-dpdk/uhd_dpdk_fops.h @@ -12,4 +12,12 @@ int _uhd_dpdk_config_req_compl(struct uhd_dpdk_config_req *req, int retval); int _uhd_dpdk_sock_setup(struct uhd_dpdk_config_req *req); int _uhd_dpdk_sock_release(struct uhd_dpdk_config_req *req); + +/* + * Get key for RX table corresponding to this socket + * + * This is primarily used to get access to the waiter entry + */ +int _uhd_dpdk_sock_rx_key(struct uhd_dpdk_socket *sock, + struct uhd_dpdk_ipv4_5tuple *key); #endif /* _UHD_DPDK_FOPS_H_ */ -- cgit v1.2.3