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libbpf: Unmap rings when umem deleted 

xsk_umem__create() does mmap for fill/comp rings, but xsk_umem__delete()
doesn't do the unmap. This works fine for regular cases, because
xsk_socket__delete() does unmap for the rings. But for the case that
xsk_socket__create_shared() fails, umem rings are not unmapped.

fill_save/comp_save are checked to determine if rings have already be
unmapped by xsk. If fill_save and comp_save are NULL, it means that the
rings have already been used by xsk. Then they are supposed to be
unmapped by xsk_socket__delete(). Otherwise, xsk_umem__delete() does the
unmap.

Fixes: 2f6324a393 ("libbpf: Support shared umems between queues and devices")
Signed-off-by: Cheng Li <lic121@chinatelecom.cn>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20220301132623.GA19995@vscode.7~
This commit is contained in:
lic121 2022-03-01 13:26:23 +00:00 committed by Andrii Nakryiko
parent c344b9fc21
commit 9c6e6a80ee
1 changed files with 11 additions and 0 deletions
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11
tools/lib/bpf/xsk.c
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@ -1193,12 +1193,23 @@ int xsk_socket__create(struct xsk_socket **xsk_ptr, const char *ifname,
int xsk_umem__delete(struct xsk_umem *umem)
{
struct xdp_mmap_offsets off;
int err;
if (!umem)
return 0;
if (umem->refcount)
return -EBUSY;
err = xsk_get_mmap_offsets(umem->fd, &off);
if (!err && umem->fill_save && umem->comp_save) {
munmap(umem->fill_save->ring - off.fr.desc,
off.fr.desc + umem->config.fill_size * sizeof(__u64));
munmap(umem->comp_save->ring - off.cr.desc,
off.cr.desc + umem->config.comp_size * sizeof(__u64));
}
close(umem->fd);
free(umem);