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Wed, 12 Feb 2020 11:49:59 +0000 (UTC) Message-ID: Subject: Re: [PATCH v5 18/26] nvme: use preallocated qsg/iov in nvme_dma_prp From: Maxim Levitsky To: Klaus Jensen , qemu-block@nongnu.org Date: Wed, 12 Feb 2020 13:49:48 +0200 In-Reply-To: <20200204095208.269131-19-k.jensen@samsung.com> References: <20200204095208.269131-1-k.jensen@samsung.com> <20200204095208.269131-19-k.jensen@samsung.com> Mime-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-MC-Unique: Ir6-swzMP9K3rpSu_dKjkw-1 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 205.139.110.61 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , Beata Michalska , qemu-devel@nongnu.org, Max Reitz , Keith Busch , Klaus Jensen , Javier Gonzalez Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Tue, 2020-02-04 at 10:52 +0100, Klaus Jensen wrote: > Since clean up of the request qsg/iov has been moved to the common > nvme_enqueue_req_completion function, there is no need to use a > stack allocated qsg/iov in nvme_dma_prp. > > Signed-off-by: Klaus Jensen > --- > hw/block/nvme.c | 18 ++++++------------ > 1 file changed, 6 insertions(+), 12 deletions(-) > > diff --git a/hw/block/nvme.c b/hw/block/nvme.c > index e97da35c4ca1..f8c81b9e2202 100644 > --- a/hw/block/nvme.c > +++ b/hw/block/nvme.c > @@ -298,23 +298,21 @@ unmap: > static uint16_t nvme_dma_prp(NvmeCtrl *n, uint8_t *ptr, uint32_t len, > uint64_t prp1, uint64_t prp2, DMADirection dir, NvmeRequest *req) > { > - QEMUSGList qsg; > - QEMUIOVector iov; > uint16_t status = NVME_SUCCESS; > size_t bytes; > > - status = nvme_map_prp(n, &qsg, &iov, prp1, prp2, len, req); > + status = nvme_map_prp(n, &req->qsg, &req->iov, prp1, prp2, len, req); > if (status) { > return status; > } > > - if (qsg.nsg > 0) { > + if (req->qsg.nsg > 0) { > uint64_t residual; > > if (dir == DMA_DIRECTION_TO_DEVICE) { > - residual = dma_buf_write(ptr, len, &qsg); > + residual = dma_buf_write(ptr, len, &req->qsg); > } else { > - residual = dma_buf_read(ptr, len, &qsg); > + residual = dma_buf_read(ptr, len, &req->qsg); > } > > if (unlikely(residual)) { > @@ -322,15 +320,13 @@ static uint16_t nvme_dma_prp(NvmeCtrl *n, uint8_t *ptr, uint32_t len, > status = NVME_INVALID_FIELD | NVME_DNR; > } > > - qemu_sglist_destroy(&qsg); > - > return status; > } > > if (dir == DMA_DIRECTION_TO_DEVICE) { > - bytes = qemu_iovec_to_buf(&iov, 0, ptr, len); > + bytes = qemu_iovec_to_buf(&req->iov, 0, ptr, len); > } else { > - bytes = qemu_iovec_from_buf(&iov, 0, ptr, len); > + bytes = qemu_iovec_from_buf(&req->iov, 0, ptr, len); > } > > if (unlikely(bytes != len)) { > @@ -338,8 +334,6 @@ static uint16_t nvme_dma_prp(NvmeCtrl *n, uint8_t *ptr, uint32_t len, > status = NVME_INVALID_FIELD | NVME_DNR; > } > > - qemu_iovec_destroy(&iov); > - > return status; > } > Reviewed-by: Maxim Levitsky Best regards, Maxim Levitsky