On Wed, Oct 25, 2023 at 3:08 AM Hawkins Jiawei <yin31...@gmail.com> wrote: > > This patch reuses vhost_vdpa_net_load_rss() with some > refactorings to restore the receive-side scaling state > at device's startup. >
Acked-by: Eugenio Pérez <epere...@redhat.com> > Signed-off-by: Hawkins Jiawei <yin31...@gmail.com> > --- > v5: > - resolve conflict with the updated patch > "Vhost-vdpa Shadow Virtqueue Hash calculation Support" > > v4: > https://lore.kernel.org/all/79caf9bf05778ed5279e11bdd1f26b49baf373ce.1697904740.git.yin31...@gmail.com/ > - add do_rss argument and relative code in vhost_vdpa_net_load_rss() > > v3: > https://lore.kernel.org/all/47b17e160ba4e55b24790b7d73b22d2b437ebe3c.1693299194.git.yin31...@gmail.com/ > - resolve conflict with updated patch > "Vhost-vdpa Shadow Virtqueue Hash calculation Support" > > RFC v2: > https://lore.kernel.org/all/af33aa80bc4ef0b2cec6c21b9448866c517fde80.1691926415.git.yin31...@gmail.com/ > - Correct the feature usage to VIRTIO_NET_F_HASH_REPORT when > loading the hash calculation state > > RFC v1: > https://lore.kernel.org/all/93d5d82f0a5df71df326830033e50358c8b6be7a.1691766252.git.yin31...@gmail.com/ > > net/vhost-vdpa.c | 67 +++++++++++++++++++++++++++++++----------------- > 1 file changed, 44 insertions(+), 23 deletions(-) > > diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c > index 3466936b87..a4cc1381fc 100644 > --- a/net/vhost-vdpa.c > +++ b/net/vhost-vdpa.c > @@ -828,7 +828,7 @@ static int vhost_vdpa_net_load_mac(VhostVDPAState *s, > const VirtIONet *n, > > static int vhost_vdpa_net_load_rss(VhostVDPAState *s, const VirtIONet *n, > struct iovec *out_cursor, > - struct iovec *in_cursor) > + struct iovec *in_cursor, bool do_rss) > { > struct virtio_net_rss_config cfg = {}; > ssize_t r; > @@ -854,21 +854,35 @@ static int vhost_vdpa_net_load_rss(VhostVDPAState *s, > const VirtIONet *n, > sizeof(n->rss_data.indirections_table[0])); > cfg.hash_types = 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_config, which corresponds to the > - * `reserved` field in struct virtio_net_hash_config. > - * > - * Note that all other fields are zeroed at their definitions, > - * except for the `indirection_table` field, where the actual data > - * is stored in the `table` variable to ensure compatibility > - * with RSS case. Therefore, we need to zero the `table` variable here. > - */ > - table[0] = 0; > + if (do_rss) { > + /* > + * According to VirtIO standard, "Number of entries in > indirection_table > + * is (indirection_table_mask + 1)". > + */ > + cfg.indirection_table_mask = > cpu_to_le16(n->rss_data.indirections_len - > + 1); > + cfg.unclassified_queue = cpu_to_le16(n->rss_data.default_queue); > + for (int i = 0; i < n->rss_data.indirections_len; ++i) { > + table[i] = cpu_to_le16(n->rss_data.indirections_table[i]); > + } > + cfg.max_tx_vq = cpu_to_le16(n->curr_queue_pairs); > + } else { > + /* > + * 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_config, which corresponds to the > + * `reserved` field in struct virtio_net_hash_config. > + * > + * Note that all other fields are zeroed at their definitions, > + * except for the `indirection_table` field, where the actual data > + * is stored in the `table` variable to ensure compatibility > + * with RSS case. Therefore, we need to zero the `table` variable > here. > + */ > + table[0] = 0; > + } > > /* > * Considering that virtio_net_handle_rss() currently does not restore > @@ -899,6 +913,7 @@ static int vhost_vdpa_net_load_rss(VhostVDPAState *s, > const VirtIONet *n, > > r = vhost_vdpa_net_load_cmd(s, out_cursor, in_cursor, > VIRTIO_NET_CTRL_MQ, > + do_rss ? VIRTIO_NET_CTRL_MQ_RSS_CONFIG : > VIRTIO_NET_CTRL_MQ_HASH_CONFIG, > data, ARRAY_SIZE(data)); > if (unlikely(r < 0)) { > @@ -933,13 +948,19 @@ static int vhost_vdpa_net_load_mq(VhostVDPAState *s, > return r; > } > > - if (!virtio_vdev_has_feature(&n->parent_obj, VIRTIO_NET_F_HASH_REPORT)) { > - return 0; > - } > - > - r = vhost_vdpa_net_load_rss(s, n, out_cursor, in_cursor); > - if (unlikely(r < 0)) { > - return r; > + if (virtio_vdev_has_feature(&n->parent_obj, VIRTIO_NET_F_RSS)) { > + /* load the receive-side scaling state */ > + r = vhost_vdpa_net_load_rss(s, n, out_cursor, in_cursor, true); > + if (unlikely(r < 0)) { > + return r; > + } > + } else if (virtio_vdev_has_feature(&n->parent_obj, > + VIRTIO_NET_F_HASH_REPORT)) { > + /* load the hash calculation state */ > + r = vhost_vdpa_net_load_rss(s, n, out_cursor, in_cursor, false); > + if (unlikely(r < 0)) { > + return r; > + } > } > > return 0; > -- > 2.25.1 >
