Currently the shared umem feature is not supported in libbpf. The patch removes the refcount check in libbpf to enable use of shared umem. Also, a umem can be shared by multiple netdevs, so remove the checking at xsk_bind.
Tested using OVS at: https://mail.openvswitch.org/pipermail/ovs-dev/2019-November/364392.html Signed-off-by: William Tu <[email protected]> --- net/xdp/xsk.c | 5 ----- tools/lib/bpf/xsk.c | 10 +++++----- 2 files changed, 5 insertions(+), 10 deletions(-) diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c index 6040bc2b0088..0f2b16e275e3 100644 --- a/net/xdp/xsk.c +++ b/net/xdp/xsk.c @@ -697,11 +697,6 @@ static int xsk_bind(struct socket *sock, struct sockaddr *addr, int addr_len) sockfd_put(sock); goto out_unlock; } - if (umem_xs->dev != dev || umem_xs->queue_id != qid) { - err = -EINVAL; - sockfd_put(sock); - goto out_unlock; - } xdp_get_umem(umem_xs->umem); WRITE_ONCE(xs->umem, umem_xs->umem); diff --git a/tools/lib/bpf/xsk.c b/tools/lib/bpf/xsk.c index 74d84f36a5b2..e6c4eb077dcd 100644 --- a/tools/lib/bpf/xsk.c +++ b/tools/lib/bpf/xsk.c @@ -579,16 +579,13 @@ int xsk_socket__create(struct xsk_socket **xsk_ptr, const char *ifname, struct sockaddr_xdp sxdp = {}; struct xdp_mmap_offsets off; struct xsk_socket *xsk; + bool shared; int err; if (!umem || !xsk_ptr || !rx || !tx) return -EFAULT; - if (umem->refcount) { - pr_warn("Error: shared umems not supported by libbpf.\n"); - return -EBUSY; - } - + shared = !!(usr_config->bind_flags & XDP_SHARED_UMEM); xsk = calloc(1, sizeof(*xsk)); if (!xsk) return -ENOMEM; @@ -687,6 +684,9 @@ int xsk_socket__create(struct xsk_socket **xsk_ptr, const char *ifname, sxdp.sxdp_queue_id = xsk->queue_id; sxdp.sxdp_flags = xsk->config.bind_flags; + if (shared) + sxdp.sxdp_shared_umem_fd = umem->fd; + err = bind(xsk->fd, (struct sockaddr *)&sxdp, sizeof(sxdp)); if (err) { err = -errno; -- 2.7.4 _______________________________________________ dev mailing list [email protected] https://mail.openvswitch.org/mailman/listinfo/ovs-dev
