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Tsirkin" To: qemu-devel@nongnu.org Cc: Peter Maydell , Hawkins Jiawei , Jason Wang Subject: [PULL 08/83] vdpa: Restore hash calculation state Message-ID: <1908cfd6e1748d94680e468b9df6321087b8fcf2.1697644299.git.mst@redhat.com> References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-Mailer: git-send-email 2.27.0.106.g8ac3dc51b1 X-Mutt-Fcc: =sent Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=mst@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1697644468996100001 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Hawkins Jiawei This patch introduces vhost_vdpa_net_load_rss() to restore the hash calculation state at device's startup. Note that vhost_vdpa_net_load_rss() has `do_rss` argument, which allows future code to reuse this function to restore the receive-side scaling state when the VIRTIO_NET_F_RSS feature is enabled in SVQ. Currently, vhost_vdpa_net_load_rss() could only be invoked when `do_rss` is set to false. Signed-off-by: Hawkins Jiawei Message-Id: Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- net/vhost-vdpa.c | 91 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 91 insertions(+) diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c index 4b7c3b81b8..40d0bcbc0b 100644 --- a/net/vhost-vdpa.c +++ b/net/vhost-vdpa.c @@ -817,6 +817,88 @@ static int vhost_vdpa_net_load_mac(VhostVDPAState *s, = const VirtIONet *n, return 0; } =20 +static int vhost_vdpa_net_load_rss(VhostVDPAState *s, const VirtIONet *n, + struct iovec *out_cursor, + struct iovec *in_cursor, bool do_rss) +{ + struct virtio_net_rss_config cfg; + ssize_t r; + g_autofree uint16_t *table =3D NULL; + + /* + * According to VirtIO standard, "Initially the device has all hash + * types disabled and reports only VIRTIO_NET_HASH_REPORT_NONE.". + * + * Therefore, there is no need to send this CVQ command if the + * driver disable the all hash types, which aligns with + * the device's defaults. + * + * Note that the device's defaults can mismatch the driver's + * configuration only at live migration. + */ + if (!n->rss_data.enabled || + n->rss_data.hash_types =3D=3D VIRTIO_NET_HASH_REPORT_NONE) { + return 0; + } + + cfg.hash_types =3D cpu_to_le32(n->rss_data.hash_types); + + /* + * According to VirtIO standard, "Field reserved MUST contain zeroes. + * It is defined to make the structure to match the layout of + * virtio_net_rss_config structure, defined in 5.1.6.5.7.". + * + * Therefore, we need to zero the fields in struct virtio_net_rss_conf= ig, + * which corresponds the `reserved` field in + * struct virtio_net_hash_config. + */ + memset(&cfg.indirection_table_mask, 0, + sizeof_field(struct virtio_net_hash_config, reserved)); + + table =3D g_malloc_n(n->rss_data.indirections_len, + sizeof(n->rss_data.indirections_table[0])); + for (int i =3D 0; i < n->rss_data.indirections_len; ++i) { + table[i] =3D cpu_to_le16(n->rss_data.indirections_table[i]); + } + + /* + * Consider that virtio_net_handle_rss() currently does not restore the + * hash key length parsed from the CVQ command sent from the guest into + * n->rss_data and uses the maximum key length in other code, so we al= so + * employthe the maxium key length here. + */ + cfg.hash_key_length =3D sizeof(n->rss_data.key); + + const struct iovec data[] =3D { + { + .iov_base =3D &cfg, + .iov_len =3D offsetof(struct virtio_net_rss_config, + indirection_table), + }, { + .iov_base =3D table, + .iov_len =3D n->rss_data.indirections_len * + sizeof(n->rss_data.indirections_table[0]), + }, { + .iov_base =3D &cfg.max_tx_vq, + .iov_len =3D offsetof(struct virtio_net_rss_config, hash_key_d= ata) - + offsetof(struct virtio_net_rss_config, max_tx_vq), + }, { + .iov_base =3D (void *)n->rss_data.key, + .iov_len =3D sizeof(n->rss_data.key), + } + }; + + r =3D vhost_vdpa_net_load_cmd(s, out_cursor, in_cursor, + VIRTIO_NET_CTRL_MQ, + VIRTIO_NET_CTRL_MQ_HASH_CONFIG, + data, ARRAY_SIZE(data)); + if (unlikely(r < 0)) { + return r; + } + + return 0; +} + static int vhost_vdpa_net_load_mq(VhostVDPAState *s, const VirtIONet *n, struct iovec *out_cursor, @@ -842,6 +924,15 @@ static int vhost_vdpa_net_load_mq(VhostVDPAState *s, return r; } =20 + if (!virtio_vdev_has_feature(&n->parent_obj, VIRTIO_NET_F_HASH_REPORT)= ) { + return 0; + } + + r =3D vhost_vdpa_net_load_rss(s, n, out_cursor, in_cursor, false); + if (unlikely(r < 0)) { + return r; + } + return 0; } =20 --=20 MST