Date: Wed, 15 Apr 2026 19:27:43 +0000 From: Michael Tuexen <tuexen@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: 04b994d19eec - main - bpf: fix handling the read timeout on ppc64 Message-ID: <69dfe6af.18613.27aafdc1@gitrepo.freebsd.org>
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The branch main has been updated by tuexen: URL: https://cgit.FreeBSD.org/src/commit/?id=04b994d19eec68a6b5d27ff4b0fa223a05f00e1f commit 04b994d19eec68a6b5d27ff4b0fa223a05f00e1f Author: Michael Tuexen <tuexen@FreeBSD.org> AuthorDate: 2026-04-15 19:24:05 +0000 Commit: Michael Tuexen <tuexen@FreeBSD.org> CommitDate: 2026-04-15 19:24:05 +0000 bpf: fix handling the read timeout on ppc64 On platforms other than amd64, BIOCSRTIMEOUT is equal to BIOCSRTIMEOUT32. Therefore, running the COMPAT_FREEBSD32 code basically clears tv_usec on big endian platforms. When tcpdump is used, the timeout requested is 100ms, which gets cleared to 0 on ppc64 platforms. This results in tcpdump showing the packets only when the read buffer is full. Thanks to kib for guiding me to the correct fix. Reported by: ivy Reviewed by: adrian, kib MFC after: 3 days Differential Revision: https://reviews.freebsd.org/D56399 --- sys/net/bpf.c | 42 ++++++++++++++++++++++-------------------- 1 file changed, 22 insertions(+), 20 deletions(-) diff --git a/sys/net/bpf.c b/sys/net/bpf.c index 05877f6410a4..9d0b76753560 100644 --- a/sys/net/bpf.c +++ b/sys/net/bpf.c @@ -1201,7 +1201,7 @@ bpfioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, case BIOCGDLTLIST32: case BIOCGRTIMEOUT32: case BIOCSRTIMEOUT32: - if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { + if (SV_CURPROC_FLAG(SV_ILP32)) { BPFD_LOCK(d); d->bd_compat32 = 1; BPFD_UNLOCK(d); @@ -1209,6 +1209,19 @@ bpfioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, } #endif +#if defined(COMPAT_FREEBSD32) + if (SV_CURPROC_FLAG(SV_ILP32)) { + /* + * On platforms other than amd64, BIOC[GS]RTIMEOUT32 is equal to + * BIOC[GS]RTIMEOUT. Since this is difficult to handle in the + * switch command, map them. + */ + if (cmd == BIOCSRTIMEOUT32) + cmd = BIOCSRTIMEOUT; + if (cmd == BIOCGRTIMEOUT32) + cmd = BIOCGRTIMEOUT; + } +#endif CURVNET_SET(TD_TO_VNET(td)); switch (cmd) { default: @@ -1419,23 +1432,19 @@ bpfioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, * Set read timeout. */ case BIOCSRTIMEOUT: -#if defined(COMPAT_FREEBSD32) && defined(__amd64__) - case BIOCSRTIMEOUT32: -#endif { struct timeval *tv = (struct timeval *)addr; -#if defined(COMPAT_FREEBSD32) +#ifdef COMPAT_FREEBSD32 struct timeval32 *tv32; struct timeval tv64; - if (cmd == BIOCSRTIMEOUT32) { + if (SV_CURPROC_FLAG(SV_ILP32)) { tv32 = (struct timeval32 *)addr; tv = &tv64; tv->tv_sec = tv32->tv_sec; tv->tv_usec = tv32->tv_usec; - } else + } #endif - tv = (struct timeval *)addr; /* * Subtract 1 tick from tvtohz() since this isn't @@ -1450,31 +1459,24 @@ bpfioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, * Get read timeout. */ case BIOCGRTIMEOUT: -#if defined(COMPAT_FREEBSD32) && defined(__amd64__) - case BIOCGRTIMEOUT32: -#endif { - struct timeval *tv; -#if defined(COMPAT_FREEBSD32) && defined(__amd64__) + struct timeval *tv = (struct timeval *)addr; +#ifdef COMPAT_FREEBSD32 struct timeval32 *tv32; struct timeval tv64; - if (cmd == BIOCGRTIMEOUT32) + if (SV_CURPROC_FLAG(SV_ILP32)) tv = &tv64; - else #endif - tv = (struct timeval *)addr; - tv->tv_sec = d->bd_rtout / hz; tv->tv_usec = (d->bd_rtout % hz) * tick; -#if defined(COMPAT_FREEBSD32) && defined(__amd64__) - if (cmd == BIOCGRTIMEOUT32) { +#ifdef COMPAT_FREEBSD32 + if (SV_CURPROC_FLAG(SV_ILP32)) { tv32 = (struct timeval32 *)addr; tv32->tv_sec = tv->tv_sec; tv32->tv_usec = tv->tv_usec; } #endif - break; }home | help
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