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Sat, 06 May 2023 07:07:16 -0700 (PDT) From: Hawkins Jiawei To: eperezma@redhat.com, jasowang@redhat.com Cc: yin31149@gmail.com, 18801353760@163.com, qemu-devel@nongnu.org Subject: [PATCH v2 1/2] vdpa: rename vhost_vdpa_net_cvq_add() Date: Sat, 6 May 2023 22:06:12 +0800 Message-Id: X-Mailer: git-send-email 2.25.1 In-Reply-To: References: MIME-Version: 1.0 Received-SPF: pass client-ip=2607:f8b0:4864:20::435; envelope-from=yin31149@gmail.com; helo=mail-pf1-x435.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_ENVFROM_END_DIGIT=0.25, FREEMAIL_FROM=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org We want to introduce a new version of vhost_vdpa_net_cvq_add() that does not poll immediately after forwarding custom buffers to the device, so that QEMU can send all the SVQ control commands in parallel instead of serialized. Signed-off-by: Hawkins Jiawei Acked-by: Jason Wang --- net/vhost-vdpa.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c index 99904a0da7..10804c7200 100644 --- a/net/vhost-vdpa.c +++ b/net/vhost-vdpa.c @@ -590,8 +590,14 @@ static void vhost_vdpa_net_cvq_stop(NetClientState *nc) vhost_vdpa_net_client_stop(nc); } -static ssize_t vhost_vdpa_net_cvq_add(VhostVDPAState *s, size_t out_len, - size_t in_len) +/** + * vhost_vdpa_net_cvq_add_and_wait() adds SVQ control commands to SVQ, + * kicks the device and polls the device used buffers. + * + * Return the length written by the device. + */ +static ssize_t vhost_vdpa_net_cvq_add_and_wait(VhostVDPAState *s, + size_t out_len, size_t in_len) { /* Buffers for the device */ const struct iovec out = { @@ -636,7 +642,7 @@ static ssize_t vhost_vdpa_net_load_cmd(VhostVDPAState *s, uint8_t class, memcpy(s->cvq_cmd_out_buffer, &ctrl, sizeof(ctrl)); memcpy(s->cvq_cmd_out_buffer + sizeof(ctrl), data, data_size); - return vhost_vdpa_net_cvq_add(s, sizeof(ctrl) + data_size, + return vhost_vdpa_net_cvq_add_and_wait(s, sizeof(ctrl) + data_size, sizeof(virtio_net_ctrl_ack)); } @@ -753,7 +759,8 @@ static int vhost_vdpa_net_handle_ctrl_avail(VhostShadowVirtqueue *svq, dev_written = sizeof(status); *s->status = VIRTIO_NET_OK; } else { - dev_written = vhost_vdpa_net_cvq_add(s, out.iov_len, sizeof(status)); + dev_written = vhost_vdpa_net_cvq_add_and_wait(s, out.iov_len, + sizeof(status)); if (unlikely(dev_written < 0)) { goto out; }