From patchwork Tue Jan 30 03:06:00 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xuan Zhuo X-Patchwork-Id: 13536768 Received: from out30-132.freemail.mail.aliyun.com (out30-132.freemail.mail.aliyun.com [115.124.30.132]) (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 1B62D53E0A; Tue, 30 Jan 2024 03:06:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=115.124.30.132 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706583990; cv=none; b=bho1bBRYGzQ3Tsr4qaDbzf2sqMTrWyb+ERZj2Wo5k70neoXe/plLVpnoaj6Sc/5wCDCd6gLGA7dIRlkCpOoa7l3+U50bslDPCNp1znXiF6CdRe+IexY68VTtyLYPnWwe8E4ny017mV/5cvIkO0lhdHcrUaTv+dusJjcin9GX0Kk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706583990; c=relaxed/simple; bh=tmhjzYNCYCrDHond5B6w87b0fu++aBkzE0b6FJjDiXU=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=qqVjdl395s50RYXR90dyYGWc9zWYzLXXuhJxpKx///xRh1yIFoPk6ppKFvFgWXWcN/h2STPzHV4KVjo1ggxOVm2KoLl5+V1X2DRYgup1Vf7icpBE8DfJjCm4HQt8is/yvArJi4TUhX1TV0cKVGpXz82G3b/WE3LhAt9l9aKfDKQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com; spf=pass smtp.mailfrom=linux.alibaba.com; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b=Ywvb1IEe; arc=none smtp.client-ip=115.124.30.132 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b="Ywvb1IEe" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1706583985; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=NS9ceng5ziq2Yn2+9KrlE+PH2QFHreCvTPLpx0wusIg=; b=Ywvb1IEeUVL4yr5O0hJN7sb5UHSdq/MiFNL1QHJ4RLquvlb1XTTsnRMFOQ+ypuruNxCw7TzS6G7FWEwyWRiyhqiZNwOOSQHc7rSANCFsY+E6ID1i9MiWobGA6Uu64NzAYyEvG9OcRGrITF1BFZTNfizElou3JEYQri9FIW/gn/Q= X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R171e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018046059;MF=xuanzhuo@linux.alibaba.com;NM=1;PH=DS;RN=37;SR=0;TI=SMTPD_---0W.eaYxi_1706583981; Received: from localhost(mailfrom:xuanzhuo@linux.alibaba.com fp:SMTPD_---0W.eaYxi_1706583981) by smtp.aliyun-inc.com; Tue, 30 Jan 2024 11:06:22 +0800 From: Xuan Zhuo To: virtualization@lists.linux.dev Cc: Richard Weinberger , Anton Ivanov , Johannes Berg , "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Hans de Goede , =?utf-8?q?Ilpo_J=C3=A4rvinen?= , Vadim Pasternak , Bjorn Andersson , Mathieu Poirier , Cornelia Huck , Halil Pasic , Eric Farman , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , Benjamin Berg , Yang Li , linux-um@lists.infradead.org, netdev@vger.kernel.org, platform-driver-x86@vger.kernel.org, linux-remoteproc@vger.kernel.org, linux-s390@vger.kernel.org, kvm@vger.kernel.org, bpf@vger.kernel.org Subject: [PATCH 10/14] virtio_net: set premapped mode by find_vqs() Date: Tue, 30 Jan 2024 11:06:00 +0800 Message-Id: <20240130030604.108463-11-xuanzhuo@linux.alibaba.com> X-Mailer: git-send-email 2.32.0.3.g01195cf9f In-Reply-To: <20240130030604.108463-1-xuanzhuo@linux.alibaba.com> References: <20240130030604.108463-1-xuanzhuo@linux.alibaba.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Git-Hash: ce068f9b825d Now, the virtio core can set the premapped mode by find_vqs(). If the premapped can be enabled, the dma array will not be allocated. So virtio-net use the api of find_vqs to enable the premapped. Judge the premapped mode by the vq->premapped instead of saving local variable. Signed-off-by: Xuan Zhuo --- drivers/net/virtio_net.c | 50 ++++++++++++++--------------------- include/linux/virtio_config.h | 10 +++---- 2 files changed, 25 insertions(+), 35 deletions(-) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index 51b1868d2f22..660459b4c3e3 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -196,9 +196,6 @@ struct receive_queue { /* Record the last dma info to free after new pages is allocated. */ struct virtnet_rq_dma *last_dma; - - /* Do dma by self */ - bool do_dma; }; /* This structure can contain rss message with maximum settings for indirection table and keysize @@ -638,7 +635,7 @@ static void *virtnet_rq_get_buf(struct receive_queue *rq, u32 *len, void **ctx) void *buf; buf = virtqueue_get_buf_ctx(rq->vq, len, ctx); - if (buf && rq->do_dma) + if (buf && rq->vq->premapped) virtnet_rq_unmap(rq, buf, *len); return buf; @@ -651,7 +648,7 @@ static void virtnet_rq_init_one_sg(struct receive_queue *rq, void *buf, u32 len) u32 offset; void *head; - if (!rq->do_dma) { + if (!rq->vq->premapped) { sg_init_one(rq->sg, buf, len); return; } @@ -681,7 +678,7 @@ static void *virtnet_rq_alloc(struct receive_queue *rq, u32 size, gfp_t gfp) head = page_address(alloc_frag->page); - if (rq->do_dma) { + if (rq->vq->premapped) { dma = head; /* new pages */ @@ -727,22 +724,6 @@ static void *virtnet_rq_alloc(struct receive_queue *rq, u32 size, gfp_t gfp) return buf; } -static void virtnet_rq_set_premapped(struct virtnet_info *vi) -{ - int i; - - /* disable for big mode */ - if (!vi->mergeable_rx_bufs && vi->big_packets) - return; - - for (i = 0; i < vi->max_queue_pairs; i++) { - if (virtqueue_set_dma_premapped(vi->rq[i].vq)) - continue; - - vi->rq[i].do_dma = true; - } -} - static void virtnet_rq_unmap_free_buf(struct virtqueue *vq, void *buf) { struct virtnet_info *vi = vq->vdev->priv; @@ -751,7 +732,7 @@ static void virtnet_rq_unmap_free_buf(struct virtqueue *vq, void *buf) rq = &vi->rq[i]; - if (rq->do_dma) + if (rq->vq->premapped) virtnet_rq_unmap(rq, buf, 0); virtnet_rq_free_buf(vi, rq, buf); @@ -1846,7 +1827,7 @@ static int add_recvbuf_small(struct virtnet_info *vi, struct receive_queue *rq, err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp); if (err < 0) { - if (rq->do_dma) + if (rq->vq->premapped) virtnet_rq_unmap(rq, buf, 0); put_page(virt_to_head_page(buf)); } @@ -1961,7 +1942,7 @@ static int add_recvbuf_mergeable(struct virtnet_info *vi, ctx = mergeable_len_to_ctx(len + room, headroom); err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp); if (err < 0) { - if (rq->do_dma) + if (rq->vq->premapped) virtnet_rq_unmap(rq, buf, 0); put_page(virt_to_head_page(buf)); } @@ -4030,7 +4011,7 @@ static void free_receive_page_frags(struct virtnet_info *vi) int i; for (i = 0; i < vi->max_queue_pairs; i++) if (vi->rq[i].alloc_frag.page) { - if (vi->rq[i].do_dma && vi->rq[i].last_dma) + if (vi->rq[i].vq->premapped && vi->rq[i].last_dma) virtnet_rq_unmap(&vi->rq[i], vi->rq[i].last_dma, 0); put_page(vi->rq[i].alloc_frag.page); } @@ -4099,6 +4080,7 @@ static int virtnet_find_vqs(struct virtnet_info *vi) int ret = -ENOMEM; int i, total_vqs; const char **names; + bool *premapped; bool *ctx; /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by @@ -4122,8 +4104,13 @@ static int virtnet_find_vqs(struct virtnet_info *vi) ctx = kcalloc(total_vqs, sizeof(*ctx), GFP_KERNEL); if (!ctx) goto err_ctx; + + premapped = kcalloc(total_vqs, sizeof(*ctx), GFP_KERNEL); + if (!ctx) + goto err_premapped; } else { ctx = NULL; + premapped = NULL; } /* Parameters for control virtqueue, if any */ @@ -4142,10 +4129,13 @@ static int virtnet_find_vqs(struct virtnet_info *vi) names[txq2vq(i)] = vi->sq[i].name; if (ctx) ctx[rxq2vq(i)] = true; + + if (premapped) + premapped[rxq2vq(i)] = true; } - ret = virtio_find_vqs_ctx(vi->vdev, total_vqs, vqs, callbacks, - names, ctx, NULL); + ret = virtio_find_vqs_ctx_premapped(vi->vdev, total_vqs, vqs, callbacks, + names, ctx, premapped, NULL); if (ret) goto err_find; @@ -4165,6 +4155,8 @@ static int virtnet_find_vqs(struct virtnet_info *vi) err_find: + kfree(premapped); +err_premapped: kfree(ctx); err_ctx: kfree(names); @@ -4234,8 +4226,6 @@ static int init_vqs(struct virtnet_info *vi) if (ret) goto err_free; - virtnet_rq_set_premapped(vi); - cpus_read_lock(); virtnet_set_affinity(vi); cpus_read_unlock(); diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h index 45b5a980561e..908e68a48c99 100644 --- a/include/linux/virtio_config.h +++ b/include/linux/virtio_config.h @@ -235,13 +235,13 @@ int virtio_find_vqs(struct virtio_device *vdev, unsigned nvqs, } static inline -int virtio_find_vqs_ctx(struct virtio_device *vdev, unsigned nvqs, - struct virtqueue *vqs[], vq_callback_t *callbacks[], - const char * const names[], const bool *ctx, - struct irq_affinity *desc) +int virtio_find_vqs_ctx_premapped(struct virtio_device *vdev, unsigned int nvqs, + struct virtqueue *vqs[], vq_callback_t *callbacks[], + const char * const names[], const bool *ctx, + const bool *premapped, struct irq_affinity *desc) { return vdev->config->find_vqs(vdev, nvqs, vqs, callbacks, names, ctx, - NULL, desc); + premapped, desc); } /**