librdmacm: extend rsocket for Redis, iperf3, memcached and more Linux APIsRsocket upstream#1702
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BatshevaBlack wants to merge 14 commits intolinux-rdma:masterfrom
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librdmacm: extend rsocket for Redis, iperf3, memcached and more Linux APIsRsocket upstream#1702BatshevaBlack wants to merge 14 commits intolinux-rdma:masterfrom
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This commit introduces epoll_create functionality to support a centralized thread for managing all epoll instances. The epoll_create call creates an epoll_inst struct and two epoll file descriptors: a "regular epfd" for handling real file descriptors and another epfd that includes the "regular epfd" added using epoll_ctl. The latter epfd is returned from the epoll_create function. Additionally, the new epoll instance is registered with a global thread that processes all instances in a round-robin fashion, efficiently handling events for both regular and rsocket file descriptors. The global thread manages polling in two steps for each epoll instance. First, it iterates through the list of rsocket fds in the epoll struct, polling each one to check for events. Second, it calls epoll_wait on the "regular epfd" to gather events from the real file descriptors. The thread keeps the events in the struct, and proceeds to the next epoll instance. Signed-off-by: Batsheva Black <bblack@nvidia.com>
This commit implements epoll_ctl with tailored handling for real and rsocket file descriptors. For regular file descriptors, epoll_ctl directly operates on the "regular epfd". For rsocket file descriptors, they are added to a dedicated list maintained in the epoll instance struct. This list ensures that the global thread can handle these file descriptors during its polling cycle. epoll_ctl triggers the thread to reprocess the epoll instance to update the ready list. Reflecting any events on the newly added file descriptors. Signed-off-by: Batsheva Black <bblack@nvidia.com>
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This commit implements epoll_wait to retrieve events processed by the centralized thread for an epoll instance. When epoll_wait is called, it copies the events collected by the global thread from the ready list in the epoll instance to the user-provided events buffer. If no events are available in the `revents` field, the function triggers the thread to recheck for events. Epoll_wait returns the total number of ready events. Signed-off-by: Batsheva Black <bblack@nvidia.com>
in case of timeout which causes poll to return, clear all signals that arrived by calling rs_poll_exit. Signed-off-by: Batsheva Black <bblack@nvidia.com>
Keep the list of the fds that are sent to poll in order to know which fd belongs to each rfd when returning the revents to the fds list. Signed-off-by: Batsheva Black <bblack@nvidia.com>
The accept4 implementation extends accept to support the additional atomic flag-setting functionality provided by accept4. Signed-off-by: Batsheva Black <bblack@nvidia.com>
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Add preload interception for fcntl64 so rsocket file descriptors support the same flag semantics as the glibc fcntl64 API. Signed-off-by: Batsheva Black <bblack@nvidia.com>
getsockopt: TCP_INFO, TCP_CONGESTION, SO_BROADCAST & IP_TOS. setsockopt: IP_TOS & TCP_CONGESTION. Signed-off-by: Batsheva Black <bblack@nvidia.com>
rfcntl keeps the files flags all in the fd_flags argument. Adding the new field fs_flags to the rs struct allows the fcntl function to keep the file status flags separately from the file descriptor flags. Signed-off-by: Batsheva Black <bblack@nvidia.com>
Add preload interception for sendfile64 so applications using the 64-bit offset sendfile64 API work correctly with rsocket file descriptors. Signed-off-by: Batsheva Black <bblack@nvidia.com>
Add preload interception for dup so that duplicating an rsocket file descriptor produces another rsocket fd that refers to the same connection. Signed-off-by: Batsheva Black <bblack@nvidia.com>
To allow us to respond to disconnect events initiated by the peer kernel CM, run the connect service always with TCP protocol- also when connection succeeds. Signed-off-by: Batsheva Black <bblack@nvidia.com>
The changes to rpoll to use a signaling fd to wake up blocked threads, combined with suspending polling while rsockets states may be changing _should_ prevent any threads from blocking indefinitely in rpoll() when a desired state change occurs. We periodically wake up any polling thread, so that it can recheck its rsocket states. The sleeping interval was set to an arbitrary value of 5 seconds, this interval is too long for apps that request a connection and are dependent on the thread waking up, so it's changed now to 0.5 seconds, but can be overridden using config files. Signed-off-by: Batsheva Black <bblack@nvidia.com>
Updated type checks to identify socket types even when additional flags are present in the type field. Changed the comparison to use bitwise AND for more accurate detection. Signed-off-by: Batsheva Black <bblack@nvidia.com>
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Summary
Extend the rsocket implementation in librdmacm so that applications such as Redis, iperf3, and memcached can use rsocket transparently via LD_PRELOAD (librspreload), and so rsocket aligns with more standard Linux socket and I/O behavior.
Motivation
The rsocket library did not fully support several POSIX/Linux interfaces (epoll, select, accept4, sendfile, fcntl64, and various socket options). Applications that rely on these either failed or fell back to TCP. This change extends the rsocket implementation to implement or fix those interfaces, so the preload can intercept them and route traffic over RDMA.
Changes