From: Magnus Karlsson magnus.karlsson@intel.com
commit 94ff9ebb49a546b7f009ed840bafa235c96d4c4b upstream.
When the need_wakeup flag was added to AF_XDP, the format of the XDP_MMAP_OFFSETS getsockopt was extended. Code was added to the kernel to take care of compatibility issues arrising from running applications using any of the two formats. However, libbpf was not extended to take care of the case when the application/libbpf uses the new format but the kernel only supports the old format. This patch adds support in libbpf for parsing the old format, before the need_wakeup flag was added, and emulating a set of static need_wakeup flags that will always work for the application.
v2 -> v3: * Incorporated code improvements suggested by Jonathan Lemon
v1 -> v2: * Rebased to bpf-next * Rewrote the code as the previous version made you blind
Fixes: a4500432c2587cb2a ("libbpf: add support for need_wakeup flag in AF_XDP part") Reported-by: Eloy Degen degeneloy@gmail.com Signed-off-by: Magnus Karlsson magnus.karlsson@intel.com Signed-off-by: Alexei Starovoitov ast@kernel.org Acked-by: Jonathan Lemon jonathan.lemon@gmail.com Link: https://lore.kernel.org/bpf/1571995035-21889-1-git-send-email-magnus.karlsso... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- tools/lib/bpf/xsk.c | 83 ++++++++++++++++++++++++++++++++++++++++++++-------- 1 file changed, 71 insertions(+), 12 deletions(-)
--- a/tools/lib/bpf/xsk.c +++ b/tools/lib/bpf/xsk.c @@ -73,6 +73,21 @@ struct xsk_nl_info { int fd; };
+/* Up until and including Linux 5.3 */ +struct xdp_ring_offset_v1 { + __u64 producer; + __u64 consumer; + __u64 desc; +}; + +/* Up until and including Linux 5.3 */ +struct xdp_mmap_offsets_v1 { + struct xdp_ring_offset_v1 rx; + struct xdp_ring_offset_v1 tx; + struct xdp_ring_offset_v1 fr; + struct xdp_ring_offset_v1 cr; +}; + int xsk_umem__fd(const struct xsk_umem *umem) { return umem ? umem->fd : -EINVAL; @@ -133,6 +148,58 @@ static int xsk_set_xdp_socket_config(str return 0; }
+static void xsk_mmap_offsets_v1(struct xdp_mmap_offsets *off) +{ + struct xdp_mmap_offsets_v1 off_v1; + + /* getsockopt on a kernel <= 5.3 has no flags fields. + * Copy over the offsets to the correct places in the >=5.4 format + * and put the flags where they would have been on that kernel. + */ + memcpy(&off_v1, off, sizeof(off_v1)); + + off->rx.producer = off_v1.rx.producer; + off->rx.consumer = off_v1.rx.consumer; + off->rx.desc = off_v1.rx.desc; + off->rx.flags = off_v1.rx.consumer + sizeof(u32); + + off->tx.producer = off_v1.tx.producer; + off->tx.consumer = off_v1.tx.consumer; + off->tx.desc = off_v1.tx.desc; + off->tx.flags = off_v1.tx.consumer + sizeof(u32); + + off->fr.producer = off_v1.fr.producer; + off->fr.consumer = off_v1.fr.consumer; + off->fr.desc = off_v1.fr.desc; + off->fr.flags = off_v1.fr.consumer + sizeof(u32); + + off->cr.producer = off_v1.cr.producer; + off->cr.consumer = off_v1.cr.consumer; + off->cr.desc = off_v1.cr.desc; + off->cr.flags = off_v1.cr.consumer + sizeof(u32); +} + +static int xsk_get_mmap_offsets(int fd, struct xdp_mmap_offsets *off) +{ + socklen_t optlen; + int err; + + optlen = sizeof(*off); + err = getsockopt(fd, SOL_XDP, XDP_MMAP_OFFSETS, off, &optlen); + if (err) + return err; + + if (optlen == sizeof(*off)) + return 0; + + if (optlen == sizeof(struct xdp_mmap_offsets_v1)) { + xsk_mmap_offsets_v1(off); + return 0; + } + + return -EINVAL; +} + int xsk_umem__create_v0_0_4(struct xsk_umem **umem_ptr, void *umem_area, __u64 size, struct xsk_ring_prod *fill, struct xsk_ring_cons *comp, @@ -141,7 +208,6 @@ int xsk_umem__create_v0_0_4(struct xsk_u struct xdp_mmap_offsets off; struct xdp_umem_reg mr; struct xsk_umem *umem; - socklen_t optlen; void *map; int err;
@@ -190,8 +256,7 @@ int xsk_umem__create_v0_0_4(struct xsk_u goto out_socket; }
- optlen = sizeof(off); - err = getsockopt(umem->fd, SOL_XDP, XDP_MMAP_OFFSETS, &off, &optlen); + err = xsk_get_mmap_offsets(umem->fd, &off); if (err) { err = -errno; goto out_socket; @@ -499,7 +564,6 @@ int xsk_socket__create(struct xsk_socket struct sockaddr_xdp sxdp = {}; struct xdp_mmap_offsets off; struct xsk_socket *xsk; - socklen_t optlen; int err;
if (!umem || !xsk_ptr || !rx || !tx) @@ -558,8 +622,7 @@ int xsk_socket__create(struct xsk_socket } }
- optlen = sizeof(off); - err = getsockopt(xsk->fd, SOL_XDP, XDP_MMAP_OFFSETS, &off, &optlen); + err = xsk_get_mmap_offsets(xsk->fd, &off); if (err) { err = -errno; goto out_socket; @@ -645,7 +708,6 @@ out_xsk_alloc: int xsk_umem__delete(struct xsk_umem *umem) { struct xdp_mmap_offsets off; - socklen_t optlen; int err;
if (!umem) @@ -654,8 +716,7 @@ int xsk_umem__delete(struct xsk_umem *um if (umem->refcount) return -EBUSY;
- optlen = sizeof(off); - err = getsockopt(umem->fd, SOL_XDP, XDP_MMAP_OFFSETS, &off, &optlen); + err = xsk_get_mmap_offsets(umem->fd, &off); if (!err) { munmap(umem->fill->ring - off.fr.desc, off.fr.desc + umem->config.fill_size * sizeof(__u64)); @@ -673,7 +734,6 @@ void xsk_socket__delete(struct xsk_socke { size_t desc_sz = sizeof(struct xdp_desc); struct xdp_mmap_offsets off; - socklen_t optlen; int err;
if (!xsk) @@ -684,8 +744,7 @@ void xsk_socket__delete(struct xsk_socke close(xsk->prog_fd); }
- optlen = sizeof(off); - err = getsockopt(xsk->fd, SOL_XDP, XDP_MMAP_OFFSETS, &off, &optlen); + err = xsk_get_mmap_offsets(xsk->fd, &off); if (!err) { if (xsk->rx) { munmap(xsk->rx->ring - off.rx.desc,