From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E78CAC5B57F for ; Sun, 30 Jun 2019 17:25:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BE09C20828 for ; Sun, 30 Jun 2019 17:25:00 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="m1JAM7jx" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726749AbfF3RYV (ORCPT ); Sun, 30 Jun 2019 13:24:21 -0400 Received: from mail-lj1-f194.google.com ([209.85.208.194]:42021 "EHLO mail-lj1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726658AbfF3RYV (ORCPT ); Sun, 30 Jun 2019 13:24:21 -0400 Received: by mail-lj1-f194.google.com with SMTP id t28so10625913lje.9 for ; Sun, 30 Jun 2019 10:24:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=nq/Fr5ga9FfpVS/76WeiZ/F4W2Ps3KMUrYs9XpFLQ9U=; b=m1JAM7jxFgTTz626vancR3myj2YTI3HwhDD7dSUSDqSEUDyxH1XHZ2EEnLnVnn/qlI YxSSLoc73DU2PCt2xfh0xIbhq8klGUM3v+ZbDDWMneprkyzGABPoZ9ctMMwlzF/cYrLd MHbdR4Xcp2TpPZoh6TmEHa44MAwIwgYPTkCCr0wBB4eKg7uraRSZqVf1KsXxDrGMJOZW 1AJMRLsbfzeQUpxusMQ1wf45FSQ3uFsbOtWgDZiPIXZWVPzGKN3Vijin3G4TZLwCdoZf FOe6jeR/5X8iTXcM/2nuyvN/TIBJfK+DfL9aKDLwROpfrywo0umBSH0RbhSBRd9QleH+ eMeg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=nq/Fr5ga9FfpVS/76WeiZ/F4W2Ps3KMUrYs9XpFLQ9U=; b=A2bNo7o+HSdGEDH6HnKC6jWG38T0Ee79El//ZkMYYpkRpdsI5Tf9juU/SYXr5cVkN/ By2Ey75fN835pWD/HLEYTtzhD3KeYCTLaTsSmEhS+nbWKb8yXsVHr1d+vkaVfSOl9BF7 WoaZNzr89cLkXW7bEPE1Os0VNcx1XJ4Ont10G92M53eL0v8rvitmV4dT1vNnBYNtyrP1 rgiP3sLl3i2KRZDYqboYGBR128DBJeQilnlMJNQitjS236dXvGZpUF/uIAMRHH7H1E1r LLrQXbkRKCbuxNRv/mmRGGQ6eLf2ZerhXAG3SX3en5jQ9WpIzRR3uM8o+DMKwh2HqkJh kGPw== X-Gm-Message-State: APjAAAWZ8pcnWNV+daprGW/xvqYVVTOY7Ow7YnnCqFfi1ry/n7RZQtlb ptJopL3/j/t0Fes9E2hasRKBRw== X-Google-Smtp-Source: APXvYqzXmPkPa9jeYtmnG7N/HecA9UovGa5vhR7RygW3HsNln2nuwphpbqFOO2/41bTIpk6LVbkBng== X-Received: by 2002:a05:651c:87:: with SMTP id 7mr9598881ljq.184.1561915458893; Sun, 30 Jun 2019 10:24:18 -0700 (PDT) Received: from localhost.localdomain (59-201-94-178.pool.ukrtel.net. [178.94.201.59]) by smtp.gmail.com with ESMTPSA id c1sm2273795lfh.13.2019.06.30.10.24.17 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Sun, 30 Jun 2019 10:24:18 -0700 (PDT) From: Ivan Khoronzhuk To: grygorii.strashko@ti.com, hawk@kernel.org, davem@davemloft.net Cc: ast@kernel.org, linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org, xdp-newbies@vger.kernel.org, ilias.apalodimas@linaro.org, netdev@vger.kernel.org, daniel@iogearbox.net, jakub.kicinski@netronome.com, john.fastabend@gmail.com, Ivan Khoronzhuk Subject: [PATCH v5 net-next 1/6] xdp: allow same allocator usage Date: Sun, 30 Jun 2019 20:23:43 +0300 Message-Id: <20190630172348.5692-2-ivan.khoronzhuk@linaro.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190630172348.5692-1-ivan.khoronzhuk@linaro.org> References: <20190630172348.5692-1-ivan.khoronzhuk@linaro.org> Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org XDP rxqs can be same for ndevs running under same rx napi softirq. But there is no ability to register same allocator for both rxqs, by fact it can same rxq but has different ndev as a reference. Due to last changes allocator destroy can be defered till the moment all packets are recycled by destination interface, afterwards it's freed. In order to schedule allocator destroy only after all users are unregistered, add refcnt to allocator object and schedule to destroy only it reaches 0. Signed-off-by: Ivan Khoronzhuk --- include/net/xdp_priv.h | 1 + net/core/xdp.c | 46 ++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 47 insertions(+) diff --git a/include/net/xdp_priv.h b/include/net/xdp_priv.h index 6a8cba6ea79a..995b21da2f27 100644 --- a/include/net/xdp_priv.h +++ b/include/net/xdp_priv.h @@ -18,6 +18,7 @@ struct xdp_mem_allocator { struct rcu_head rcu; struct delayed_work defer_wq; unsigned long defer_warn; + unsigned long refcnt; }; #endif /* __LINUX_NET_XDP_PRIV_H__ */ diff --git a/net/core/xdp.c b/net/core/xdp.c index b29d7b513a18..a44621190fdc 100644 --- a/net/core/xdp.c +++ b/net/core/xdp.c @@ -98,6 +98,18 @@ bool __mem_id_disconnect(int id, bool force) WARN(1, "Request remove non-existing id(%d), driver bug?", id); return true; } + + /* to avoid calling hash lookup twice, decrement refcnt here till it + * reaches zero, then it can be called from workqueue afterwards. + */ + if (xa->refcnt) + xa->refcnt--; + + if (xa->refcnt) { + mutex_unlock(&mem_id_lock); + return true; + } + xa->disconnect_cnt++; /* Detects in-flight packet-pages for page_pool */ @@ -312,6 +324,33 @@ static bool __is_supported_mem_type(enum xdp_mem_type type) return true; } +static struct xdp_mem_allocator *xdp_allocator_get(void *allocator) +{ + struct xdp_mem_allocator *xae, *xa = NULL; + struct rhashtable_iter iter; + + mutex_lock(&mem_id_lock); + rhashtable_walk_enter(mem_id_ht, &iter); + do { + rhashtable_walk_start(&iter); + + while ((xae = rhashtable_walk_next(&iter)) && !IS_ERR(xae)) { + if (xae->allocator == allocator) { + xae->refcnt++; + xa = xae; + break; + } + } + + rhashtable_walk_stop(&iter); + + } while (xae == ERR_PTR(-EAGAIN)); + rhashtable_walk_exit(&iter); + mutex_unlock(&mem_id_lock); + + return xa; +} + int xdp_rxq_info_reg_mem_model(struct xdp_rxq_info *xdp_rxq, enum xdp_mem_type type, void *allocator) { @@ -347,6 +386,12 @@ int xdp_rxq_info_reg_mem_model(struct xdp_rxq_info *xdp_rxq, } } + xdp_alloc = xdp_allocator_get(allocator); + if (xdp_alloc) { + xdp_rxq->mem.id = xdp_alloc->mem.id; + return 0; + } + xdp_alloc = kzalloc(sizeof(*xdp_alloc), gfp); if (!xdp_alloc) return -ENOMEM; @@ -360,6 +405,7 @@ int xdp_rxq_info_reg_mem_model(struct xdp_rxq_info *xdp_rxq, xdp_rxq->mem.id = id; xdp_alloc->mem = xdp_rxq->mem; xdp_alloc->allocator = allocator; + xdp_alloc->refcnt = 1; /* Insert allocator into ID lookup table */ ptr = rhashtable_insert_slow(mem_id_ht, &id, &xdp_alloc->node); -- 2.17.1