From patchwork Wed Jul 19 13:24:08 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Fijalkowski, Maciej" X-Patchwork-Id: 13318986 X-Patchwork-Delegate: bpf@iogearbox.net Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1FCB623BCE; Wed, 19 Jul 2023 13:25:22 +0000 (UTC) Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 59050FD; Wed, 19 Jul 2023 06:25:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1689773119; x=1721309119; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=UQOkGhkEFkr9RQILif7dBYSzAZi7HHcOykMf9q5D34M=; b=g12aB8iGFkpvig/Nw3fKtejkk1tEzf3yG0BPPNy+qDhaL/HoWV7vYFkq RWEIEbAaNLajKO9VxMqgNFFf64ZovrH+pg+1loywVpU/lTl6iF6jker0K R8WnPBR/ZfvquBQ0buUojm+xoxKc71YFjaKElJWFpohVydaO5BhI4doRX XL32YxCLzJu338fF+0zqd260XaIt84aaZaEXi1qErcYK/vdh+t0jnYvlw OH7KHrxf1Hlcp3ttXPooQ3HMopn/MxTBYS4cnIKsIY8UdC+ukeyDbdJcx vtpIE2TRsTtgvPIWG99WhFbtIi3eLlcYoqYmTOC6iBjINpxlsTRIcAtF0 Q==; X-IronPort-AV: E=McAfee;i="6600,9927,10776"; a="363920618" X-IronPort-AV: E=Sophos;i="6.01,216,1684825200"; d="scan'208";a="363920618" Received: from orsmga007.jf.intel.com ([10.7.209.58]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Jul 2023 06:25:08 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10776"; a="717978118" X-IronPort-AV: E=Sophos;i="6.01,216,1684825200"; d="scan'208";a="717978118" Received: from boxer.igk.intel.com ([10.102.20.173]) by orsmga007.jf.intel.com with ESMTP; 19 Jul 2023 06:25:04 -0700 From: Maciej Fijalkowski To: bpf@vger.kernel.org, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org Cc: netdev@vger.kernel.org, magnus.karlsson@intel.com, bjorn@kernel.org, toke@kernel.org, kuba@kernel.org, horms@kernel.org, tirthendu.sarkar@intel.com, Maciej Fijalkowski Subject: [PATCH v7 bpf-next 11/24] xsk: support mbuf on ZC RX Date: Wed, 19 Jul 2023 15:24:08 +0200 Message-Id: <20230719132421.584801-12-maciej.fijalkowski@intel.com> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20230719132421.584801-1-maciej.fijalkowski@intel.com> References: <20230719132421.584801-1-maciej.fijalkowski@intel.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, RCVD_IN_DNSWL_BLOCKED,SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE, URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net X-Patchwork-Delegate: bpf@iogearbox.net Given that skb_shared_info relies on skb_frag_t, in order to support xskb chaining, introduce xdp_buff_xsk::xskb_list_node and xsk_buff_pool::xskb_list. This is needed so ZC drivers can add frags as xskb nodes which will make it possible to handle it both when producing AF_XDP Rx descriptors as well as freeing/recycling all the frags that a single frame carries. Speaking of latter, update xsk_buff_free() to take care of list nodes. For the former (adding as frags), introduce xsk_buff_add_frag() for ZC drivers usage that is going to be used to add a frag to xskb list from pool. xsk_buff_get_frag() will be utilized by XDP_TX and, on contrary, will return xdp_buff. One of the previous patches added a wrapper for ZC Rx so implement xskb list walk and production of Rx descriptors there. On bind() path, bail out if socket wants to use ZC multi-buffer but underlying netdev does not support it. Signed-off-by: Maciej Fijalkowski --- include/net/xdp_sock_drv.h | 44 +++++++++++++++++++++++++++++++++++++ include/net/xsk_buff_pool.h | 2 ++ net/xdp/xsk.c | 26 +++++++++++++++++++++- net/xdp/xsk_buff_pool.c | 7 ++++++ 4 files changed, 78 insertions(+), 1 deletion(-) diff --git a/include/net/xdp_sock_drv.h b/include/net/xdp_sock_drv.h index 0d34cdb5567d..1f6fc8c7a84c 100644 --- a/include/net/xdp_sock_drv.h +++ b/include/net/xdp_sock_drv.h @@ -108,10 +108,45 @@ static inline bool xsk_buff_can_alloc(struct xsk_buff_pool *pool, u32 count) static inline void xsk_buff_free(struct xdp_buff *xdp) { struct xdp_buff_xsk *xskb = container_of(xdp, struct xdp_buff_xsk, xdp); + struct list_head *xskb_list = &xskb->pool->xskb_list; + struct xdp_buff_xsk *pos, *tmp; + if (likely(!xdp_buff_has_frags(xdp))) + goto out; + + list_for_each_entry_safe(pos, tmp, xskb_list, xskb_list_node) { + list_del(&pos->xskb_list_node); + xp_free(pos); + } + + xdp_get_shared_info_from_buff(xdp)->nr_frags = 0; +out: xp_free(xskb); } +static inline void xsk_buff_add_frag(struct xdp_buff *xdp) +{ + struct xdp_buff_xsk *frag = container_of(xdp, struct xdp_buff_xsk, xdp); + + list_add_tail(&frag->xskb_list_node, &frag->pool->xskb_list); +} + +static inline struct xdp_buff *xsk_buff_get_frag(struct xdp_buff *first) +{ + struct xdp_buff_xsk *xskb = container_of(first, struct xdp_buff_xsk, xdp); + struct xdp_buff *ret = NULL; + struct xdp_buff_xsk *frag; + + frag = list_first_entry_or_null(&xskb->pool->xskb_list, + struct xdp_buff_xsk, xskb_list_node); + if (frag) { + list_del(&frag->xskb_list_node); + ret = &frag->xdp; + } + + return ret; +} + static inline void xsk_buff_set_size(struct xdp_buff *xdp, u32 size) { xdp->data = xdp->data_hard_start + XDP_PACKET_HEADROOM; @@ -265,6 +300,15 @@ static inline void xsk_buff_free(struct xdp_buff *xdp) { } +static inline void xsk_buff_add_frag(struct xdp_buff *xdp) +{ +} + +static inline struct xdp_buff *xsk_buff_get_frag(struct xdp_buff *first) +{ + return NULL; +} + static inline void xsk_buff_set_size(struct xdp_buff *xdp, u32 size) { } diff --git a/include/net/xsk_buff_pool.h b/include/net/xsk_buff_pool.h index 4dcca163e076..b0bdff26fc88 100644 --- a/include/net/xsk_buff_pool.h +++ b/include/net/xsk_buff_pool.h @@ -29,6 +29,7 @@ struct xdp_buff_xsk { struct xsk_buff_pool *pool; u64 orig_addr; struct list_head free_list_node; + struct list_head xskb_list_node; }; #define XSK_CHECK_PRIV_TYPE(t) BUILD_BUG_ON(sizeof(t) > offsetofend(struct xdp_buff_xsk, cb)) @@ -54,6 +55,7 @@ struct xsk_buff_pool { struct xdp_umem *umem; struct work_struct work; struct list_head free_list; + struct list_head xskb_list; u32 heads_cnt; u16 queue_id; diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c index ba755fed3750..4f1e0599146e 100644 --- a/net/xdp/xsk.c +++ b/net/xdp/xsk.c @@ -155,8 +155,32 @@ static int __xsk_rcv_zc(struct xdp_sock *xs, struct xdp_buff_xsk *xskb, u32 len, static int xsk_rcv_zc(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len) { struct xdp_buff_xsk *xskb = container_of(xdp, struct xdp_buff_xsk, xdp); + u32 frags = xdp_buff_has_frags(xdp); + struct xdp_buff_xsk *pos, *tmp; + struct list_head *xskb_list; + u32 contd = 0; + int err; + + if (frags) + contd = XDP_PKT_CONTD; - return __xsk_rcv_zc(xs, xskb, len, 0); + err = __xsk_rcv_zc(xs, xskb, len, contd); + if (err || likely(!frags)) + goto out; + + xskb_list = &xskb->pool->xskb_list; + list_for_each_entry_safe(pos, tmp, xskb_list, xskb_list_node) { + if (list_is_singular(xskb_list)) + contd = 0; + len = pos->xdp.data_end - pos->xdp.data; + err = __xsk_rcv_zc(xs, pos, len, contd); + if (err) + return err; + list_del(&pos->xskb_list_node); + } + +out: + return err; } static void *xsk_copy_xdp_start(struct xdp_buff *from) diff --git a/net/xdp/xsk_buff_pool.c b/net/xdp/xsk_buff_pool.c index 26f6d304451e..b3f7b310811e 100644 --- a/net/xdp/xsk_buff_pool.c +++ b/net/xdp/xsk_buff_pool.c @@ -86,6 +86,7 @@ struct xsk_buff_pool *xp_create_and_assign_umem(struct xdp_sock *xs, pool->umem = umem; pool->addrs = umem->addrs; INIT_LIST_HEAD(&pool->free_list); + INIT_LIST_HEAD(&pool->xskb_list); INIT_LIST_HEAD(&pool->xsk_tx_list); spin_lock_init(&pool->xsk_tx_list_lock); spin_lock_init(&pool->cq_lock); @@ -99,6 +100,7 @@ struct xsk_buff_pool *xp_create_and_assign_umem(struct xdp_sock *xs, xskb->pool = pool; xskb->xdp.frame_sz = umem->chunk_size - umem->headroom; INIT_LIST_HEAD(&xskb->free_list_node); + INIT_LIST_HEAD(&xskb->xskb_list_node); if (pool->unaligned) pool->free_heads[i] = xskb; else @@ -187,6 +189,11 @@ int xp_assign_dev(struct xsk_buff_pool *pool, goto err_unreg_pool; } + if (netdev->xdp_zc_max_segs == 1 && (flags & XDP_USE_SG)) { + err = -EOPNOTSUPP; + goto err_unreg_pool; + } + bpf.command = XDP_SETUP_XSK_POOL; bpf.xsk.pool = pool; bpf.xsk.queue_id = queue_id;