On 8/14/19 6:32 AM, Björn Töpel wrote: > On Wed, 14 Aug 2019 at 13:57, Ivan Khoronzhuk > <ivan.khoronz...@linaro.org> wrote: >> >> On Wed, Aug 14, 2019 at 12:24:05PM +0300, Ivan Khoronzhuk wrote: >>> On Tue, Aug 13, 2019 at 04:38:13PM -0700, Andrii Nakryiko wrote: >>> >>> Hi, Andrii >>> >>>> On Tue, Aug 13, 2019 at 3:24 AM Ivan Khoronzhuk >>>> <ivan.khoronz...@linaro.org> wrote: >>>>> >>>>> That's needed to get __NR_mmap2 when mmap2 syscall is used. >>>>> >>>>> Signed-off-by: Ivan Khoronzhuk <ivan.khoronz...@linaro.org> >>>>> --- >>>>> tools/lib/bpf/xsk.c | 1 + >>>>> 1 file changed, 1 insertion(+) >>>>> >>>>> diff --git a/tools/lib/bpf/xsk.c b/tools/lib/bpf/xsk.c >>>>> index 5007b5d4fd2c..f2fc40f9804c 100644 >>>>> --- a/tools/lib/bpf/xsk.c >>>>> +++ b/tools/lib/bpf/xsk.c >>>>> @@ -12,6 +12,7 @@ >>>>> #include <stdlib.h> >>>>> #include <string.h> >>>>> #include <unistd.h> >>>>> +#include <asm/unistd.h> >>>> >>>> asm/unistd.h is not present in Github libbpf projection. Is there any >>> >>> Look on includes from >>> tools/lib/bpf/libpf.c >>> tools/lib/bpf/bpf.c >>> >>> That's how it's done... Copping headers to arch/arm will not >>> solve this, it includes both of them anyway, and anyway it needs >>> asm/unistd.h inclusion here, only because xsk.c needs __NR_* >>> >>> >> >> There is one more radical solution for this I can send, but I'm not sure how >> it >> can impact on other syscals/arches... >> >> Looks like: >> >> >> diff --git a/tools/lib/bpf/Makefile b/tools/lib/bpf/Makefile >> index 9312066a1ae3..8b2f8ff7ce44 100644 >> --- a/tools/lib/bpf/Makefile >> +++ b/tools/lib/bpf/Makefile >> @@ -113,6 +113,7 @@ override CFLAGS += -Werror -Wall >> override CFLAGS += -fPIC >> override CFLAGS += $(INCLUDES) >> override CFLAGS += -fvisibility=hidden >> +override CFLAGS += -D_FILE_OFFSET_BITS=64 >> > > Hmm, isn't this glibc-ism? Does is it work for, say, musl or bionic? > > If this is portable, and works on 32-, and 64-bit archs, I'm happy > with the patch. :-)
Second here. Looks defining -D_FILE_OFFSET_BITS=64 is a well known fix for 32bit system to deal with files > 2GB. I remembered I used it in distant past. The below link also explains the case. https://digital-domain.net/largefiles.html Testing on musl is necessary as Arnaldo's perf test suite indeed tested it. Probably bionic too, not really familiar with that. > > > Björn > >> ifeq ($(VERBOSE),1) >> Q = >> diff --git a/tools/lib/bpf/xsk.c b/tools/lib/bpf/xsk.c >> index f2fc40f9804c..ff2d03b8380d 100644 >> --- a/tools/lib/bpf/xsk.c >> +++ b/tools/lib/bpf/xsk.c >> @@ -75,23 +75,6 @@ struct xsk_nl_info { >> int fd; >> }; >> >> -/* For 32-bit systems, we need to use mmap2 as the offsets are 64-bit. >> - * Unfortunately, it is not part of glibc. >> - */ >> -static inline void *xsk_mmap(void *addr, size_t length, int prot, int flags, >> - int fd, __u64 offset) >> -{ >> -#ifdef __NR_mmap2 >> - unsigned int page_shift = __builtin_ffs(getpagesize()) - 1; >> - long ret = syscall(__NR_mmap2, addr, length, prot, flags, fd, >> - (off_t)(offset >> page_shift)); >> - >> - return (void *)ret; >> -#else >> - return mmap(addr, length, prot, flags, fd, offset); >> -#endif >> -} >> - >> int xsk_umem__fd(const struct xsk_umem *umem) >> { >> return umem ? umem->fd : -EINVAL; >> @@ -211,10 +194,9 @@ int xsk_umem__create(struct xsk_umem **umem_ptr, void >> *umem_area, __u64 size, >> goto out_socket; >> } >> >> - map = xsk_mmap(NULL, off.fr.desc + >> - umem->config.fill_size * sizeof(__u64), >> - PROT_READ | PROT_WRITE, MAP_SHARED | MAP_POPULATE, >> - umem->fd, XDP_UMEM_PGOFF_FILL_RING); >> + map = mmap(NULL, off.fr.desc + umem->config.fill_size * >> sizeof(__u64), >> + PROT_READ | PROT_WRITE, MAP_SHARED | MAP_POPULATE, >> umem->fd, >> + XDP_UMEM_PGOFF_FILL_RING); >> if (map == MAP_FAILED) { >> err = -errno; >> goto out_socket; >> @@ -228,10 +210,9 @@ int xsk_umem__create(struct xsk_umem **umem_ptr, void >> *umem_area, __u64 size, >> fill->ring = map + off.fr.desc; >> fill->cached_cons = umem->config.fill_size; >> >> - map = xsk_mmap(NULL, >> - off.cr.desc + umem->config.comp_size * sizeof(__u64), >> - PROT_READ | PROT_WRITE, MAP_SHARED | MAP_POPULATE, >> - umem->fd, XDP_UMEM_PGOFF_COMPLETION_RING); >> + map = mmap(NULL, off.cr.desc + umem->config.comp_size * >> sizeof(__u64), >> + PROT_READ | PROT_WRITE, MAP_SHARED | MAP_POPULATE, >> umem->fd, >> + XDP_UMEM_PGOFF_COMPLETION_RING); >> if (map == MAP_FAILED) { >> err = -errno; >> goto out_mmap; >> @@ -552,11 +533,10 @@ int xsk_socket__create(struct xsk_socket **xsk_ptr, >> const char *ifname, >> } >> >> if (rx) { >> - rx_map = xsk_mmap(NULL, off.rx.desc + >> - xsk->config.rx_size * sizeof(struct >> xdp_desc), >> - PROT_READ | PROT_WRITE, >> - MAP_SHARED | MAP_POPULATE, >> - xsk->fd, XDP_PGOFF_RX_RING); >> + rx_map = mmap(NULL, off.rx.desc + >> + xsk->config.rx_size * sizeof(struct xdp_desc), >> + PROT_READ | PROT_WRITE, MAP_SHARED | >> MAP_POPULATE, >> + xsk->fd, XDP_PGOFF_RX_RING); >> if (rx_map == MAP_FAILED) { >> err = -errno; >> goto out_socket; >> @@ -571,11 +551,10 @@ int xsk_socket__create(struct xsk_socket **xsk_ptr, >> const char *ifname, >> xsk->rx = rx; >> >> if (tx) { >> - tx_map = xsk_mmap(NULL, off.tx.desc + >> - xsk->config.tx_size * sizeof(struct >> xdp_desc), >> - PROT_READ | PROT_WRITE, >> - MAP_SHARED | MAP_POPULATE, >> - xsk->fd, XDP_PGOFF_TX_RING); >> + tx_map = mmap(NULL, off.tx.desc + >> + xsk->config.tx_size * sizeof(struct xdp_desc), >> + PROT_READ | PROT_WRITE, MAP_SHARED | >> MAP_POPULATE, >> + xsk->fd, XDP_PGOFF_TX_RING); >> if (tx_map == MAP_FAILED) { >> err = -errno; >> goto out_mmap_rx; >> >> >> If maintainers are ready to accept this I can send. >> What do you say? >> >> -- >> Regards, >> Ivan Khoronzhuk
