Repository files (latest commit first)

Filename	Latest commit message	Latest commit date
Guangguan Wang c9d5f2776c net/smc: check sndbuf_space again after NOSPACE flag is set in smc_poll ... [ Upstream commit 679e9ddcf90dbdf98aaaa71a492454654b627bcb ] When application sending data more than sndbuf_space, there have chances application will sleep in epoll_wait, and will never be wakeup again. This is caused by a race between smc_poll and smc_cdc_tx_handler. application tasklet smc_tx_sendmsg(len > sndbuf_space) | epoll_wait for EPOLL_OUT,timeout=0 | smc_poll | if (!smc->conn.sndbuf_space) | | smc_cdc_tx_handler | atomic_add sndbuf_space | smc_tx_sndbuf_nonfull | if (!test_bit SOCK_NOSPACE) | do not sk_write_space; set_bit SOCK_NOSPACE; | return mask=0; | Application will sleep in epoll_wait as smc_poll returns 0. And smc_cdc_tx_handler will not call sk_write_space because the SOCK_NOSPACE has not be set. If there is no inflight cdc msg, sk_write_space will not be called any more, and application will sleep in epoll_wait forever. So check sndbuf_space again after NOSPACE flag is set to break the race. Fixes: 8dce2786a2 ("net/smc: smc_poll improvements") Signed-off-by: Guangguan Wang <guangguan.wang@linux.alibaba.com> Suggested-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org>		2025-01-09 13:23:27 +01:00
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af_smc.c	net/smc: check sndbuf_space again after NOSPACE flag is set in smc_poll	2025-01-09 13:23:27 +01:00
Kconfig
Makefile
smc.h	net/smc: fix dangling sock under state SMC_APPFINCLOSEWAIT	2023-11-20 10:30:16 +01:00
smc_cdc.c	net/smc: fix dangling sock under state SMC_APPFINCLOSEWAIT	2023-11-20 10:30:16 +01:00
smc_cdc.h
smc_clc.c
smc_clc.h
smc_close.c	net/smc: fix dangling sock under state SMC_APPFINCLOSEWAIT	2023-11-20 10:30:16 +01:00
smc_close.h
smc_core.c	net/smc: set rmb's SG_MAX_SINGLE_ALLOC limitation only when CONFIG_ARCH_NO_SG_CHAIN is defined	2024-08-19 05:33:28 +02:00
smc_core.h
smc_diag.c	net/smc: fix illegal rmb_desc access in SMC-D connection dump	2024-02-23 08:24:50 +01:00
smc_ib.c
smc_ib.h
smc_ism.c
smc_ism.h
smc_llc.c
smc_llc.h
smc_netns.h
smc_pnet.c
smc_pnet.h
smc_rx.c	net/smc: non blocking recvmsg() return -EAGAIN when no data and signal_pending	2022-05-18 09:47:25 +02:00
smc_rx.h
smc_tx.c
smc_tx.h
smc_wr.c
smc_wr.h