From 82c41671ca4f597b6ff05bd5d118161deec26e07 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Bj=C3=B6rn=20T=C3=B6pel?= Date: Wed, 20 May 2020 21:21:01 +0200 Subject: [PATCH] xdp: Simplify xdp_return_{frame, frame_rx_napi, buff} MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The xdp_return_{frame,frame_rx_napi,buff} function are never used, except in xdp_convert_zc_to_xdp_frame(), by the MEM_TYPE_XSK_BUFF_POOL memory type. To simplify and reduce code, change so that xdp_convert_zc_to_xdp_frame() calls xsk_buff_free() directly since the type is know, and remove MEM_TYPE_XSK_BUFF_POOL from the switch statement in __xdp_return() function. Suggested-by: Maxim Mikityanskiy Signed-off-by: Björn Töpel Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20200520192103.355233-14-bjorn.topel@gmail.com --- net/core/xdp.c | 21 +++++++++------------ 1 file changed, 9 insertions(+), 12 deletions(-) diff --git a/net/core/xdp.c b/net/core/xdp.c index a8c2f243367d..90f44f382115 100644 --- a/net/core/xdp.c +++ b/net/core/xdp.c @@ -335,10 +335,11 @@ EXPORT_SYMBOL_GPL(xdp_rxq_info_reg_mem_model); * scenarios (e.g. queue full), it is possible to return the xdp_frame * while still leveraging this protection. The @napi_direct boolean * is used for those calls sites. Thus, allowing for faster recycling - * of xdp_frames/pages in those cases. + * of xdp_frames/pages in those cases. This path is never used by the + * MEM_TYPE_XSK_BUFF_POOL memory type, so it's explicitly not part of + * the switch-statement. */ -static void __xdp_return(void *data, struct xdp_mem_info *mem, bool napi_direct, - struct xdp_buff *xdp) +static void __xdp_return(void *data, struct xdp_mem_info *mem, bool napi_direct) { struct xdp_mem_allocator *xa; struct page *page; @@ -360,33 +361,29 @@ static void __xdp_return(void *data, struct xdp_mem_info *mem, bool napi_direct, page = virt_to_page(data); /* Assumes order0 page*/ put_page(page); break; - case MEM_TYPE_XSK_BUFF_POOL: - /* NB! Only valid from an xdp_buff! */ - xsk_buff_free(xdp); - break; default: /* Not possible, checked in xdp_rxq_info_reg_mem_model() */ + WARN(1, "Incorrect XDP memory type (%d) usage", mem->type); break; } } void xdp_return_frame(struct xdp_frame *xdpf) { - __xdp_return(xdpf->data, &xdpf->mem, false, NULL); + __xdp_return(xdpf->data, &xdpf->mem, false); } EXPORT_SYMBOL_GPL(xdp_return_frame); void xdp_return_frame_rx_napi(struct xdp_frame *xdpf) { - __xdp_return(xdpf->data, &xdpf->mem, true, NULL); + __xdp_return(xdpf->data, &xdpf->mem, true); } EXPORT_SYMBOL_GPL(xdp_return_frame_rx_napi); void xdp_return_buff(struct xdp_buff *xdp) { - __xdp_return(xdp->data, &xdp->rxq->mem, true, xdp); + __xdp_return(xdp->data, &xdp->rxq->mem, true); } -EXPORT_SYMBOL_GPL(xdp_return_buff); /* Only called for MEM_TYPE_PAGE_POOL see xdp.h */ void __xdp_release_frame(void *data, struct xdp_mem_info *mem) @@ -467,7 +464,7 @@ struct xdp_frame *xdp_convert_zc_to_xdp_frame(struct xdp_buff *xdp) xdpf->metasize = metasize; xdpf->mem.type = MEM_TYPE_PAGE_ORDER0; - xdp_return_buff(xdp); + xsk_buff_free(xdp); return xdpf; } EXPORT_SYMBOL_GPL(xdp_convert_zc_to_xdp_frame);