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[PATCH 2/5] virtio-net: prepare for variable RSS key and indir table len
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From: |
Maxime Coquelin |
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Subject: |
[PATCH 2/5] virtio-net: prepare for variable RSS key and indir table lengths |
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Date: |
Fri, 8 Apr 2022 14:28:10 +0200 |
This patch is a preliminary rework to support RSS with
Vhost-user backends. It enables supporting different types
of hashes, key lengths and indirection table lengths.
This patch does not introduces behavioral changes.
Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
---
ebpf/ebpf_rss.c | 8 ++++----
hw/net/virtio-net.c | 35 +++++++++++++++++++++++++---------
include/hw/virtio/virtio-net.h | 16 +++++++++++++---
include/migration/vmstate.h | 10 ++++++++++
4 files changed, 53 insertions(+), 16 deletions(-)
diff --git a/ebpf/ebpf_rss.c b/ebpf/ebpf_rss.c
index 4a63854175..f03be5f919 100644
--- a/ebpf/ebpf_rss.c
+++ b/ebpf/ebpf_rss.c
@@ -96,7 +96,7 @@ static bool ebpf_rss_set_indirections_table(struct
EBPFRSSContext *ctx,
uint32_t i = 0;
if (!ebpf_rss_is_loaded(ctx) || indirections_table == NULL ||
- len > VIRTIO_NET_RSS_MAX_TABLE_LEN) {
+ len > VIRTIO_NET_RSS_DEFAULT_TABLE_LEN) {
return false;
}
@@ -116,13 +116,13 @@ static bool ebpf_rss_set_toepliz_key(struct
EBPFRSSContext *ctx,
uint32_t map_key = 0;
/* prepare toeplitz key */
- uint8_t toe[VIRTIO_NET_RSS_MAX_KEY_SIZE] = {};
+ uint8_t toe[VIRTIO_NET_RSS_DEFAULT_KEY_SIZE] = {};
if (!ebpf_rss_is_loaded(ctx) || toeplitz_key == NULL ||
- len != VIRTIO_NET_RSS_MAX_KEY_SIZE) {
+ len != VIRTIO_NET_RSS_DEFAULT_KEY_SIZE) {
return false;
}
- memcpy(toe, toeplitz_key, VIRTIO_NET_RSS_MAX_KEY_SIZE);
+ memcpy(toe, toeplitz_key, VIRTIO_NET_RSS_DEFAULT_KEY_SIZE);
*(uint32_t *)toe = ntohl(*(uint32_t *)toe);
if (bpf_map_update_elem(ctx->map_toeplitz_key, &map_key, toe,
diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 73145d6390..38436e472b 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -137,12 +137,11 @@ static void virtio_net_get_config(VirtIODevice *vdev,
uint8_t *config)
memcpy(netcfg.mac, n->mac, ETH_ALEN);
virtio_stl_p(vdev, &netcfg.speed, n->net_conf.speed);
netcfg.duplex = n->net_conf.duplex;
- netcfg.rss_max_key_size = VIRTIO_NET_RSS_MAX_KEY_SIZE;
+ netcfg.rss_max_key_size = n->rss_capa.max_key_size;
virtio_stw_p(vdev, &netcfg.rss_max_indirection_table_length,
- virtio_host_has_feature(vdev, VIRTIO_NET_F_RSS) ?
- VIRTIO_NET_RSS_MAX_TABLE_LEN : 1);
+ n->rss_capa.max_indirection_len);
virtio_stl_p(vdev, &netcfg.supported_hash_types,
- VIRTIO_NET_RSS_SUPPORTED_HASHES);
+ n->rss_capa.supported_hashes);
memcpy(config, &netcfg, n->config_size);
/*
@@ -1202,7 +1201,7 @@ static bool virtio_net_attach_epbf_rss(VirtIONet *n)
if (!ebpf_rss_set_all(&n->ebpf_rss, &config,
n->rss_data.indirections_table, n->rss_data.key,
- VIRTIO_NET_RSS_MAX_KEY_SIZE)) {
+ n->rss_data.key_len)) {
return false;
}
@@ -1277,7 +1276,7 @@ static uint16_t virtio_net_handle_rss(VirtIONet *n,
err_value = n->rss_data.indirections_len;
goto error;
}
- if (n->rss_data.indirections_len > VIRTIO_NET_RSS_MAX_TABLE_LEN) {
+ if (n->rss_data.indirections_len > n->rss_capa.max_indirection_len) {
err_msg = "Too large indirection table";
err_value = n->rss_data.indirections_len;
goto error;
@@ -1323,7 +1322,7 @@ static uint16_t virtio_net_handle_rss(VirtIONet *n,
err_value = queue_pairs;
goto error;
}
- if (temp.b > VIRTIO_NET_RSS_MAX_KEY_SIZE) {
+ if (temp.b > n->rss_capa.max_key_size) {
err_msg = "Invalid key size";
err_value = temp.b;
goto error;
@@ -1339,6 +1338,14 @@ static uint16_t virtio_net_handle_rss(VirtIONet *n,
}
offset += size_get;
size_get = temp.b;
+ n->rss_data.key_len = temp.b;
+ g_free(n->rss_data.key);
+ n->rss_data.key = g_malloc(size_get);
+ if (!n->rss_data.key) {
+ err_msg = "Can't allocate key";
+ err_value = n->rss_data.key_len;
+ goto error;
+ }
s = iov_to_buf(iov, iov_cnt, offset, n->rss_data.key, size_get);
if (s != size_get) {
err_msg = "Can get key buffer";
@@ -3093,8 +3100,9 @@ static const VMStateDescription vmstate_virtio_net_rss = {
VMSTATE_UINT32(rss_data.hash_types, VirtIONet),
VMSTATE_UINT16(rss_data.indirections_len, VirtIONet),
VMSTATE_UINT16(rss_data.default_queue, VirtIONet),
- VMSTATE_UINT8_ARRAY(rss_data.key, VirtIONet,
- VIRTIO_NET_RSS_MAX_KEY_SIZE),
+ VMSTATE_VARRAY_UINT8_ALLOC(rss_data.key, VirtIONet,
+ rss_data.key_len, 0,
+ vmstate_info_uint8, uint8_t),
VMSTATE_VARRAY_UINT16_ALLOC(rss_data.indirections_table, VirtIONet,
rss_data.indirections_len, 0,
vmstate_info_uint16, uint16_t),
@@ -3523,8 +3531,16 @@ static void virtio_net_device_realize(DeviceState *dev,
Error **errp)
net_rx_pkt_init(&n->rx_pkt, false);
if (virtio_has_feature(n->host_features, VIRTIO_NET_F_RSS)) {
+ n->rss_capa.max_key_size = VIRTIO_NET_RSS_DEFAULT_KEY_SIZE;
+ n->rss_capa.max_indirection_len = VIRTIO_NET_RSS_DEFAULT_TABLE_LEN;
+ n->rss_capa.supported_hashes = VIRTIO_NET_RSS_SUPPORTED_HASHES;
+
virtio_net_load_ebpf(n);
+ } else {
+ n->rss_capa.max_indirection_len = 1;
}
+
+
}
static void virtio_net_device_unrealize(DeviceState *dev)
@@ -3567,6 +3583,7 @@ static void virtio_net_device_unrealize(DeviceState *dev)
qemu_del_nic(n->nic);
virtio_net_rsc_cleanup(n);
g_free(n->rss_data.indirections_table);
+ g_free(n->rss_data.key);
net_rx_pkt_uninit(n->rx_pkt);
virtio_cleanup(vdev);
}
diff --git a/include/hw/virtio/virtio-net.h b/include/hw/virtio/virtio-net.h
index eb87032627..6794b354ad 100644
--- a/include/hw/virtio/virtio-net.h
+++ b/include/hw/virtio/virtio-net.h
@@ -127,8 +127,16 @@ typedef struct VirtioNetRscChain {
/* Maximum packet size we can receive from tap device: header + 64k */
#define VIRTIO_NET_MAX_BUFSIZE (sizeof(struct virtio_net_hdr) + (64 * KiB))
-#define VIRTIO_NET_RSS_MAX_KEY_SIZE 40
-#define VIRTIO_NET_RSS_MAX_TABLE_LEN 128
+typedef struct VirtioNetRssCapa {
+ uint8_t max_key_size;
+ uint16_t max_indirection_len;
+ uint32_t supported_hashes;
+} VirtioNetRssCapa;
+
+#define VIRTIO_NET_RSS_MIN_KEY_SIZE 40
+#define VIRTIO_NET_RSS_DEFAULT_KEY_SIZE 40
+#define VIRTIO_NET_RSS_MIN_TABLE_LEN 128
+#define VIRTIO_NET_RSS_DEFAULT_TABLE_LEN 128
typedef struct VirtioNetRssData {
bool enabled;
@@ -136,7 +144,8 @@ typedef struct VirtioNetRssData {
bool redirect;
bool populate_hash;
uint32_t hash_types;
- uint8_t key[VIRTIO_NET_RSS_MAX_KEY_SIZE];
+ uint8_t key_len;
+ uint8_t *key;
uint16_t indirections_len;
uint16_t *indirections_table;
uint16_t default_queue;
@@ -213,6 +222,7 @@ struct VirtIONet {
QDict *primary_opts;
bool primary_opts_from_json;
Notifier migration_state;
+ VirtioNetRssCapa rss_capa;
VirtioNetRssData rss_data;
struct NetRxPkt *rx_pkt;
struct EBPFRSSContext ebpf_rss;
diff --git a/include/migration/vmstate.h b/include/migration/vmstate.h
index ad24aa1934..9398cdf803 100644
--- a/include/migration/vmstate.h
+++ b/include/migration/vmstate.h
@@ -448,6 +448,16 @@ extern const VMStateInfo vmstate_info_qlist;
.offset = vmstate_offset_varray(_state, _field, _type), \
}
+#define VMSTATE_VARRAY_UINT8_ALLOC(_field, _state, _field_num, _version,
_info, _type) {\
+ .name = (stringify(_field)), \
+ .version_id = (_version), \
+ .num_offset = vmstate_offset_value(_state, _field_num, uint8_t),\
+ .info = &(_info), \
+ .size = sizeof(_type), \
+ .flags = VMS_VARRAY_UINT8 | VMS_POINTER | VMS_ALLOC, \
+ .offset = vmstate_offset_pointer(_state, _field, _type), \
+}
+
#define VMSTATE_VSTRUCT_TEST(_field, _state, _test, _version, _vmsd, _type,
_struct_version) { \
.name = (stringify(_field)), \
.version_id = (_version), \
--
2.35.1
- [PATCH 0/5] Vhost-user: add Virtio RSS support, Maxime Coquelin, 2022/04/08
- [PATCH 5/5] vhost-user: add RSS support, Maxime Coquelin, 2022/04/08
- [PATCH 4/5] docs: introduce RSS support in Vhost-user specification, Maxime Coquelin, 2022/04/08
- [PATCH 3/5] virtio-net: add RSS support for Vhost backends, Maxime Coquelin, 2022/04/08
- [PATCH 1/5] ebpf: pass and check RSS key length to the loader, Maxime Coquelin, 2022/04/08
- [PATCH 2/5] virtio-net: prepare for variable RSS key and indir table lengths,
Maxime Coquelin <=
- Re: [PATCH 0/5] Vhost-user: add Virtio RSS support, Jason Wang, 2022/04/15