From patchwork Tue Nov 7 21:40:27 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Wei X-Patchwork-Id: 13449345 X-Patchwork-Delegate: kuba@kernel.org 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 DF74F450D1 for ; Tue, 7 Nov 2023 21:40:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=davidwei-uk.20230601.gappssmtp.com header.i=@davidwei-uk.20230601.gappssmtp.com header.b="k9vEzKgG" Received: from mail-pg1-x52b.google.com (mail-pg1-x52b.google.com [IPv6:2607:f8b0:4864:20::52b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B8F1310E4 for ; Tue, 7 Nov 2023 13:40:58 -0800 (PST) Received: by mail-pg1-x52b.google.com with SMTP id 41be03b00d2f7-5bd0631f630so107747a12.0 for ; Tue, 07 Nov 2023 13:40:58 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=davidwei-uk.20230601.gappssmtp.com; s=20230601; t=1699393258; x=1699998058; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=520r0fT9CXFqnN6K8LnXvZLFpQESKDxVi7WN1Xfbe2s=; b=k9vEzKgGlRKmhi2MuyolRjg5HtyNkSuNUVCRr0Jvexarp+wKHrVnPNqne56FWpyAEI igW6nHudepHRNs7Wp9vDHYF/DhEzpmTPgCn3qhlIA01xd/99xMqgdmC6RvS8jJOQWsKY 8qp178i/m62iTjNOvwFoIxwrLJRKYorN1bIHt3TIWpE7R8Y9OOdodowTlgjsZ6P3bHlO mePztIytxhFUt3upa+u/4Fj/BlGe2qkrk2gjU5eDlQeQZXBUj/UKAff9xNx2dgltRq3k WoGe2oJsh+VjP6vClHszNRjWlo6kmld/vCD62JScEjV69ofpno51OZM8ikgAoIrS/H62 hOdg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1699393258; x=1699998058; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=520r0fT9CXFqnN6K8LnXvZLFpQESKDxVi7WN1Xfbe2s=; b=bsv325OD0B7KNpO1qJURa0ii0bnuTKGoDDLNZA15fDF3FNv+8cVBLe1afTwkefNnl+ zRJqty67jsdaXECppO0ksMDeYx5UsVSSFjjejUXE8PnzjpWfYU/dhSp1+vx5BisTD0WX 2ylyRMfnF2J/ayH1K/ox7tjGD84aaPQm/oKpFdTI28q1YzimhBpVxqktJl6kfLUy3pgl FPBKCdAW8qgx63O3lk+G3AY2fmY32ezYhG8V+im7Jw+lMEhhKBI+Km14G7NGgAXIfjwJ hBvdRwpBuE1OtF2rdHNtc2sz/gwC3aD0WApo2IO8RDaSX7nl3mQf2J2PGyoEaNnIJrSn ix4A== X-Gm-Message-State: AOJu0YwsBnj40EXVqt3E7anO686qfGxPooYFuQ7Vxx/bupsy9U3a6kqL JPDeqc9Qxg2bOOQqVz5NTH1c3Q== X-Google-Smtp-Source: AGHT+IFF+B6gbHUBADrXjroISxhXSQTrTB1jUxSanL6FHfskkynBovVZjD0Q3/Xkekd9MJkNt6gUMA== X-Received: by 2002:a17:90a:fb42:b0:280:6cde:ecc2 with SMTP id iq2-20020a17090afb4200b002806cdeecc2mr5299320pjb.11.1699393258176; Tue, 07 Nov 2023 13:40:58 -0800 (PST) Received: from localhost (fwdproxy-prn-010.fbsv.net. [2a03:2880:ff:a::face:b00c]) by smtp.gmail.com with ESMTPSA id ft20-20020a17090b0f9400b002800d17a21csm268331pjb.15.2023.11.07.13.40.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 07 Nov 2023 13:40:57 -0800 (PST) From: David Wei To: io-uring@vger.kernel.org, netdev@vger.kernel.org Cc: Jens Axboe , Pavel Begunkov , Jakub Kicinski , Paolo Abeni , "David S. Miller" , Eric Dumazet , Jesper Dangaard Brouer , David Ahern , Mina Almasry , Willem de Bruijn , Dragos Tatulea Subject: [PATCH 02/20] io_uring: add mmap support for shared ifq ringbuffers Date: Tue, 7 Nov 2023 13:40:27 -0800 Message-Id: <20231107214045.2172393-3-dw@davidwei.uk> X-Mailer: git-send-email 2.39.3 In-Reply-To: <20231107214045.2172393-1-dw@davidwei.uk> References: <20231107214045.2172393-1-dw@davidwei.uk> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 This patch adds mmap support for ifq rbuf rings. There are two rings and a struct io_rbuf_ring that contains the head and tail ptrs into each ring. Just like the io_uring SQ/CQ rings, userspace issues a single mmap call using the io_uring fd w/ magic offset IORING_OFF_RBUF_RING. An opaque ptr is returned to userspace, which is then expected to use the offsets returned in the registration struct to get access to the head/tail and rings. Co-developed-by: Pavel Begunkov Signed-off-by: Pavel Begunkov Signed-off-by: David Wei --- include/uapi/linux/io_uring.h | 2 ++ io_uring/io_uring.c | 5 +++++ io_uring/zc_rx.c | 17 +++++++++++++++++ 3 files changed, 24 insertions(+) diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h index 84c82a789543..ae5608bcd785 100644 --- a/include/uapi/linux/io_uring.h +++ b/include/uapi/linux/io_uring.h @@ -416,6 +416,8 @@ enum { #define IORING_OFF_PBUF_RING 0x80000000ULL #define IORING_OFF_PBUF_SHIFT 16 #define IORING_OFF_MMAP_MASK 0xf8000000ULL +#define IORING_OFF_RBUF_RING 0x20000000ULL +#define IORING_OFF_RBUF_SHIFT 16 /* * Filled with the offset for mmap(2) diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c index ae7f37aabe78..f06e9ed397da 100644 --- a/io_uring/io_uring.c +++ b/io_uring/io_uring.c @@ -3438,6 +3438,11 @@ static void *io_uring_validate_mmap_request(struct file *file, return ERR_PTR(-EINVAL); break; } + case IORING_OFF_RBUF_RING: + if (!ctx->ifq) + return ERR_PTR(-EINVAL); + ptr = ctx->ifq->ring; + break; default: return ERR_PTR(-EINVAL); } diff --git a/io_uring/zc_rx.c b/io_uring/zc_rx.c index 45dab29fe0ae..a3a54845c712 100644 --- a/io_uring/zc_rx.c +++ b/io_uring/zc_rx.c @@ -35,6 +35,7 @@ int io_register_zc_rx_ifq(struct io_ring_ctx *ctx, { struct io_uring_zc_rx_ifq_reg reg; struct io_zc_rx_ifq *ifq; + size_t ring_sz, rqes_sz, cqes_sz; int ret; if (copy_from_user(®, arg, sizeof(reg))) @@ -59,6 +60,22 @@ int io_register_zc_rx_ifq(struct io_ring_ctx *ctx, ifq->if_rxq_id = reg.if_rxq_id; ctx->ifq = ifq; + ring_sz = sizeof(struct io_rbuf_ring); + rqes_sz = sizeof(struct io_uring_rbuf_rqe) * ifq->rq_entries; + cqes_sz = sizeof(struct io_uring_rbuf_cqe) * ifq->cq_entries; + reg.mmap_sz = ring_sz + rqes_sz + cqes_sz; + reg.rq_off.rqes = ring_sz; + reg.cq_off.cqes = ring_sz + rqes_sz; + reg.rq_off.head = offsetof(struct io_rbuf_ring, rq.head); + reg.rq_off.tail = offsetof(struct io_rbuf_ring, rq.tail); + reg.cq_off.head = offsetof(struct io_rbuf_ring, cq.head); + reg.cq_off.tail = offsetof(struct io_rbuf_ring, cq.tail); + + if (copy_to_user(arg, ®, sizeof(reg))) { + ret = -EFAULT; + goto err; + } + return 0; err: io_zc_rx_ifq_free(ifq);