From 458f7272341265e443c227ba55ee4a338021a60a Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Bj=C3=B6rn=20T=C3=B6pel?= Date: Fri, 22 Jan 2021 11:53:49 +0100 Subject: [PATCH] xsk: Remove explicit_free parameter from __xsk_rcv() MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The explicit_free parameter of the __xsk_rcv() function was used to mark whether the call was via the generic XDP or the native XDP path. Instead of clutter the code with if-statements and "true/false" parameters which are hard to understand, simply move the explicit free to the __xsk_map_redirect() which is always called from the native XDP path. Signed-off-by: Björn Töpel Signed-off-by: Daniel Borkmann Reviewed-by: Maciej Fijalkowski Link: https://lore.kernel.org/bpf/20210122105351.11751-2-bjorn.topel@gmail.com --- net/xdp/xsk.c | 47 +++++++++++++++++++++++++++++++---------------- 1 file changed, 31 insertions(+), 16 deletions(-) diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c index 4a83117507f5..4faabd1ecfd1 100644 --- a/net/xdp/xsk.c +++ b/net/xdp/xsk.c @@ -184,12 +184,13 @@ static void xsk_copy_xdp(struct xdp_buff *to, struct xdp_buff *from, u32 len) memcpy(to_buf, from_buf, len + metalen); } -static int __xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len, - bool explicit_free) +static int __xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp) { struct xdp_buff *xsk_xdp; int err; + u32 len; + len = xdp->data_end - xdp->data; if (len > xsk_pool_get_rx_frame_size(xs->pool)) { xs->rx_dropped++; return -ENOSPC; @@ -207,8 +208,6 @@ static int __xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len, xsk_buff_free(xsk_xdp); return err; } - if (explicit_free) - xdp_return_buff(xdp); return 0; } @@ -230,11 +229,8 @@ static bool xsk_is_bound(struct xdp_sock *xs) return false; } -static int xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp, - bool explicit_free) +static int xsk_rcv_check(struct xdp_sock *xs, struct xdp_buff *xdp) { - u32 len; - if (!xsk_is_bound(xs)) return -EINVAL; @@ -242,11 +238,7 @@ static int xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp, return -EINVAL; sk_mark_napi_id_once_xdp(&xs->sk, xdp); - len = xdp->data_end - xdp->data; - - return xdp->rxq->mem.type == MEM_TYPE_XSK_BUFF_POOL ? - __xsk_rcv_zc(xs, xdp, len) : - __xsk_rcv(xs, xdp, len, explicit_free); + return 0; } static void xsk_flush(struct xdp_sock *xs) @@ -261,18 +253,41 @@ int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp) int err; spin_lock_bh(&xs->rx_lock); - err = xsk_rcv(xs, xdp, false); - xsk_flush(xs); + err = xsk_rcv_check(xs, xdp); + if (!err) { + err = __xsk_rcv(xs, xdp); + xsk_flush(xs); + } spin_unlock_bh(&xs->rx_lock); return err; } +static int xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp) +{ + int err; + u32 len; + + err = xsk_rcv_check(xs, xdp); + if (err) + return err; + + if (xdp->rxq->mem.type == MEM_TYPE_XSK_BUFF_POOL) { + len = xdp->data_end - xdp->data; + return __xsk_rcv_zc(xs, xdp, len); + } + + err = __xsk_rcv(xs, xdp); + if (!err) + xdp_return_buff(xdp); + return err; +} + int __xsk_map_redirect(struct xdp_sock *xs, struct xdp_buff *xdp) { struct list_head *flush_list = this_cpu_ptr(&xskmap_flush_list); int err; - err = xsk_rcv(xs, xdp, true); + err = xsk_rcv(xs, xdp); if (err) return err;