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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH net-next 2/4] xen-netback: add control protocol implementation
My recent patch to include/xen/interface/io/netif.h defines a new shared
ring (in addition to the rx and tx rings) for passing control messages
from a VM frontend driver to a backend driver.
A previous patch added the necessary boilerplate for mapping the control
ring from the frontend, should it be created. This patch adds
implementations for each of the defined protocol messages.
Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
---
drivers/net/xen-netback/Makefile | 2 +-
drivers/net/xen-netback/common.h | 43 +++++
drivers/net/xen-netback/hash.c | 361 ++++++++++++++++++++++++++++++++++++
drivers/net/xen-netback/interface.c | 28 +++
drivers/net/xen-netback/netback.c | 49 ++++-
5 files changed, 480 insertions(+), 3 deletions(-)
create mode 100644 drivers/net/xen-netback/hash.c
diff --git a/drivers/net/xen-netback/Makefile b/drivers/net/xen-netback/Makefile
index e346e81..11e02be 100644
--- a/drivers/net/xen-netback/Makefile
+++ b/drivers/net/xen-netback/Makefile
@@ -1,3 +1,3 @@
obj-$(CONFIG_XEN_NETDEV_BACKEND) := xen-netback.o
-xen-netback-y := netback.o xenbus.o interface.o
+xen-netback-y := netback.o xenbus.o interface.o hash.o
diff --git a/drivers/net/xen-netback/common.h b/drivers/net/xen-netback/common.h
index 093a12a..4959716 100644
--- a/drivers/net/xen-netback/common.h
+++ b/drivers/net/xen-netback/common.h
@@ -220,6 +220,32 @@ struct xenvif_mcast_addr {
#define XEN_NETBK_MCAST_MAX 64
+#define XEN_NETBK_MAX_HASH_KEY_SIZE 40
+#define XEN_NETBK_MAX_HASH_MAPPING_SIZE 128
+#define XEN_NETBK_HASH_TAG_SIZE 40
+
+struct xenvif_hash_cache_entry {
+ u8 tag[XEN_NETBK_HASH_TAG_SIZE];
+ unsigned int len;
+ u32 val;
+ int seq;
+};
+
+struct xenvif_hash_cache {
+ rwlock_t lock;
+ struct xenvif_hash_cache_entry *entry;
+ atomic_t seq;
+};
+
+struct xenvif_hash {
+ unsigned int alg;
+ u32 flags;
+ u8 key[XEN_NETBK_MAX_HASH_KEY_SIZE];
+ u32 mapping[XEN_NETBK_MAX_HASH_MAPPING_SIZE];
+ unsigned int size;
+ struct xenvif_hash_cache cache;
+};
+
struct xenvif {
/* Unique identifier for this interface. */
domid_t domid;
@@ -251,6 +277,8 @@ struct xenvif {
unsigned int num_queues; /* active queues, resource allocated */
unsigned int stalled_queues;
+ struct xenvif_hash hash;
+
struct xenbus_watch credit_watch;
struct xenbus_watch mcast_ctrl_watch;
@@ -353,6 +381,7 @@ extern bool separate_tx_rx_irq;
extern unsigned int rx_drain_timeout_msecs;
extern unsigned int rx_stall_timeout_msecs;
extern unsigned int xenvif_max_queues;
+extern unsigned int xenvif_hash_cache_size;
#ifdef CONFIG_DEBUG_FS
extern struct dentry *xen_netback_dbg_root;
@@ -366,4 +395,18 @@ void xenvif_skb_zerocopy_complete(struct xenvif_queue
*queue);
bool xenvif_mcast_match(struct xenvif *vif, const u8 *addr);
void xenvif_mcast_addr_list_free(struct xenvif *vif);
+/* Hash */
+int xenvif_init_hash(struct xenvif *vif);
+void xenvif_deinit_hash(struct xenvif *vif);
+
+u32 xenvif_set_hash_alg(struct xenvif *vif, u32 alg);
+u32 xenvif_get_hash_flags(struct xenvif *vif, u32 *flags);
+u32 xenvif_set_hash_flags(struct xenvif *vif, u32 flags);
+u32 xenvif_set_hash_key(struct xenvif *vif, u32 gref, u32 len);
+u32 xenvif_set_hash_mapping_size(struct xenvif *vif, u32 size);
+u32 xenvif_set_hash_mapping(struct xenvif *vif, u32 gref, u32 len,
+ u32 off);
+
+void xenvif_set_skb_hash(struct xenvif *vif, struct sk_buff *skb);
+
#endif /* __XEN_NETBACK__COMMON_H__ */
diff --git a/drivers/net/xen-netback/hash.c b/drivers/net/xen-netback/hash.c
new file mode 100644
index 0000000..054bfd9
--- /dev/null
+++ b/drivers/net/xen-netback/hash.c
@@ -0,0 +1,361 @@
+/*
+ * Copyright (c) 2016 Citrix Systems Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version 2
+ * as published by the Free Softare Foundation; or, when distributed
+ * separately from the Linux kernel or incorporated into other
+ * software packages, subject to the following license:
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this source file (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy, modify,
+ * merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#define XEN_NETIF_DEFINE_TOEPLITZ
+
+#include "common.h"
+#include <linux/vmalloc.h>
+
+static u32 xenvif_new_hash(struct xenvif *vif, const u8 *data,
+ unsigned int len)
+{
+ struct xenvif_hash_cache_entry new, *entry, *oldest = NULL;
+ unsigned long flags;
+ u32 val;
+ unsigned int i;
+
+ val = xen_netif_toeplitz_hash(vif->hash.key,
+ sizeof(vif->hash.key),
+ data, len);
+
+ if (xenvif_hash_cache_size == 0)
+ goto out;
+
+ write_lock_irqsave(&vif->hash.cache.lock, flags);
+
+ /* Create a new cache entry */
+ memcpy(new.tag, data, len);
+ new.len = len;
+ new.val = val;
+ new.seq = atomic_inc_return(&vif->hash.cache.seq);
+
+ /* Find the oldest entry in the cache. */
+ for (i = 0; i < xenvif_hash_cache_size; i++) {
+ entry = &vif->hash.cache.entry[i];
+
+ if (!oldest ||
+ (new.seq - entry->seq > new.seq - oldest->seq))
+ oldest = entry;
+ }
+
+ /* Replace that entry with the new one. */
+ *oldest = new;
+
+ write_unlock_irqrestore(&vif->hash.cache.lock, flags);
+
+out:
+ return val;
+}
+
+static void xenvif_flush_hash(struct xenvif *vif)
+{
+ unsigned long flags;
+
+ if (xenvif_hash_cache_size == 0)
+ return;
+
+ write_lock_irqsave(&vif->hash.cache.lock, flags);
+
+ memset(vif->hash.cache.entry, 0, xenvif_hash_cache_size *
+ sizeof(struct xenvif_hash_cache_entry));
+
+ write_unlock_irqrestore(&vif->hash.cache.lock, flags);
+}
+
+static u32 xenvif_find_hash(struct xenvif *vif, const u8 *data,
+ unsigned int len)
+{
+ struct xenvif_hash_cache_entry *entry;
+ unsigned long flags;
+ unsigned int i;
+ bool found = false;
+
+ if (len >= XEN_NETBK_HASH_TAG_SIZE)
+ return 0;
+
+ if (xenvif_hash_cache_size == 0)
+ return xenvif_new_hash(vif, data, len);
+
+ read_lock_irqsave(&vif->hash.cache.lock, flags);
+
+ for (i = 0; i < xenvif_hash_cache_size; i++) {
+ entry = &vif->hash.cache.entry[i];
+
+ if (entry->len == len &&
+ memcmp(entry->tag, data, len) == 0) {
+ found = true;
+ break;
+ }
+ }
+
+ read_unlock_irqrestore(&vif->hash.cache.lock, flags);
+
+ if (!found)
+ return xenvif_new_hash(vif, data, len);
+
+ entry->seq = atomic_inc_return(&vif->hash.cache.seq);
+ return entry->val;
+}
+
+void xenvif_set_skb_hash(struct xenvif *vif, struct sk_buff *skb)
+{
+ struct flow_keys flow;
+ u32 hash = 0;
+ enum pkt_hash_types type = PKT_HASH_TYPE_NONE;
+ u32 flags = vif->hash.flags;
+ bool has_tcp_hdr;
+
+ /* Quick rejection test: If the network protocol doesn't
+ * correspond to any enabled hash type then there's no point
+ * in parsing the packet header.
+ */
+ switch (skb->protocol) {
+ case htons(ETH_P_IP):
+ if (flags & (XEN_NETIF_CTRL_HASH_TYPE_IPV4_TCP |
+ XEN_NETIF_CTRL_HASH_TYPE_IPV4))
+ break;
+
+ goto done;
+
+ case htons(ETH_P_IPV6):
+ if (flags & (XEN_NETIF_CTRL_HASH_TYPE_IPV6_TCP |
+ XEN_NETIF_CTRL_HASH_TYPE_IPV6))
+ break;
+
+ goto done;
+
+ default:
+ goto done;
+ }
+
+ memset(&flow, 0, sizeof(flow));
+ if (!skb_flow_dissect_flow_keys(skb, &flow, 0))
+ goto done;
+
+ has_tcp_hdr = (flow.basic.ip_proto == IPPROTO_TCP) &&
+ !(flow.control.flags & FLOW_DIS_IS_FRAGMENT);
+
+ switch (skb->protocol) {
+ case htons(ETH_P_IP):
+ if (has_tcp_hdr &&
+ (flags & XEN_NETIF_CTRL_HASH_TYPE_IPV4_TCP)) {
+ u8 data[12];
+
+ memcpy(&data[0], &flow.addrs.v4addrs.src, 4);
+ memcpy(&data[4], &flow.addrs.v4addrs.dst, 4);
+ memcpy(&data[8], &flow.ports.src, 2);
+ memcpy(&data[10], &flow.ports.dst, 2);
+
+ hash = xenvif_find_hash(vif, data, sizeof(data));
+ type = PKT_HASH_TYPE_L4;
+ } else if (flags & XEN_NETIF_CTRL_HASH_TYPE_IPV4) {
+ u8 data[8];
+
+ memcpy(&data[0], &flow.addrs.v4addrs.src, 4);
+ memcpy(&data[4], &flow.addrs.v4addrs.dst, 4);
+
+ hash = xenvif_find_hash(vif, data, sizeof(data));
+ type = PKT_HASH_TYPE_L3;
+ }
+
+ break;
+
+ case htons(ETH_P_IPV6):
+ if (has_tcp_hdr &&
+ (flags & XEN_NETIF_CTRL_HASH_TYPE_IPV6_TCP)) {
+ u8 data[36];
+
+ memcpy(&data[0], &flow.addrs.v6addrs.src, 16);
+ memcpy(&data[16], &flow.addrs.v6addrs.dst, 16);
+ memcpy(&data[32], &flow.ports.src, 2);
+ memcpy(&data[34], &flow.ports.dst, 2);
+
+ hash = xenvif_find_hash(vif, data, sizeof(data));
+ type = PKT_HASH_TYPE_L4;
+ } else if (flags & XEN_NETIF_CTRL_HASH_TYPE_IPV6) {
+ u8 data[32];
+
+ memcpy(&data[0], &flow.addrs.v6addrs.src, 16);
+ memcpy(&data[16], &flow.addrs.v6addrs.dst, 16);
+
+ hash = xenvif_find_hash(vif, data, sizeof(data));
+ type = PKT_HASH_TYPE_L3;
+ }
+
+ break;
+ }
+
+done:
+ if (type == PKT_HASH_TYPE_NONE)
+ skb_clear_hash(skb);
+ else
+ __skb_set_sw_hash(skb, hash, type == PKT_HASH_TYPE_L4);
+}
+
+u32 xenvif_set_hash_alg(struct xenvif *vif, u32 alg)
+{
+ switch (alg) {
+ case XEN_NETIF_CTRL_HASH_ALGORITHM_NONE:
+ case XEN_NETIF_CTRL_HASH_ALGORITHM_TOEPLITZ:
+ break;
+
+ default:
+ return XEN_NETIF_CTRL_STATUS_INVALID_PARAMETER;
+ }
+
+ vif->hash.alg = alg;
+
+ return XEN_NETIF_CTRL_STATUS_SUCCESS;
+}
+
+u32 xenvif_get_hash_flags(struct xenvif *vif, u32 *flags)
+{
+ if (vif->hash.alg == XEN_NETIF_CTRL_HASH_ALGORITHM_NONE)
+ return XEN_NETIF_CTRL_STATUS_NOT_SUPPORTED;
+
+ *flags = XEN_NETIF_CTRL_HASH_TYPE_IPV4 |
+ XEN_NETIF_CTRL_HASH_TYPE_IPV4_TCP |
+ XEN_NETIF_CTRL_HASH_TYPE_IPV6 |
+ XEN_NETIF_CTRL_HASH_TYPE_IPV6_TCP;
+
+ return XEN_NETIF_CTRL_STATUS_SUCCESS;
+}
+
+u32 xenvif_set_hash_flags(struct xenvif *vif, u32 flags)
+{
+ if (flags & ~(XEN_NETIF_CTRL_HASH_TYPE_IPV4 |
+ XEN_NETIF_CTRL_HASH_TYPE_IPV4_TCP |
+ XEN_NETIF_CTRL_HASH_TYPE_IPV6 |
+ XEN_NETIF_CTRL_HASH_TYPE_IPV6_TCP))
+ return XEN_NETIF_CTRL_STATUS_INVALID_PARAMETER;
+
+ if (vif->hash.alg == XEN_NETIF_CTRL_HASH_ALGORITHM_NONE)
+ return XEN_NETIF_CTRL_STATUS_INVALID_PARAMETER;
+
+ vif->hash.flags = flags;
+
+ return XEN_NETIF_CTRL_STATUS_SUCCESS;
+}
+
+u32 xenvif_set_hash_key(struct xenvif *vif, u32 gref, u32 len)
+{
+ u8 *key = vif->hash.key;
+ struct gnttab_copy copy_op = {
+ .source.u.ref = gref,
+ .source.domid = vif->domid,
+ .dest.u.gmfn = virt_to_gfn(key),
+ .dest.domid = DOMID_SELF,
+ .dest.offset = xen_offset_in_page(key),
+ .len = len,
+ .flags = GNTCOPY_source_gref
+ };
+
+ if (len > XEN_NETBK_MAX_HASH_KEY_SIZE)
+ return XEN_NETIF_CTRL_STATUS_INVALID_PARAMETER;
+
+ if (len != 0) {
+ gnttab_batch_copy(©_op, 1);
+
+ if (copy_op.status != GNTST_okay)
+ return XEN_NETIF_CTRL_STATUS_INVALID_PARAMETER;
+ }
+
+ /* Clear any remaining key octets */
+ if (len < XEN_NETBK_MAX_HASH_KEY_SIZE)
+ memset(key + len, 0, XEN_NETBK_MAX_HASH_KEY_SIZE - len);
+
+ xenvif_flush_hash(vif);
+
+ return XEN_NETIF_CTRL_STATUS_SUCCESS;
+}
+
+u32 xenvif_set_hash_mapping_size(struct xenvif *vif, u32 size)
+{
+ if (size > XEN_NETBK_MAX_HASH_MAPPING_SIZE)
+ return XEN_NETIF_CTRL_STATUS_INVALID_PARAMETER;
+
+ vif->hash.size = size;
+ memset(vif->hash.mapping, 0, sizeof(u32) * size);
+
+ return XEN_NETIF_CTRL_STATUS_SUCCESS;
+}
+
+u32 xenvif_set_hash_mapping(struct xenvif *vif, u32 gref, u32 len,
+ u32 off)
+{
+ u32 *mapping = &vif->hash.mapping[off];
+ struct gnttab_copy copy_op = {
+ .source.u.ref = gref,
+ .source.domid = vif->domid,
+ .dest.u.gmfn = virt_to_gfn(mapping),
+ .dest.domid = DOMID_SELF,
+ .dest.offset = xen_offset_in_page(mapping),
+ .len = len * sizeof(u32),
+ .flags = GNTCOPY_source_gref
+ };
+
+ if ((off + len > vif->hash.size) || copy_op.len > XEN_PAGE_SIZE)
+ return XEN_NETIF_CTRL_STATUS_INVALID_PARAMETER;
+
+ while (len-- != 0)
+ if (mapping[off++] >= vif->num_queues)
+ return XEN_NETIF_CTRL_STATUS_INVALID_PARAMETER;
+
+ if (len != 0) {
+ gnttab_batch_copy(©_op, 1);
+
+ if (copy_op.status != GNTST_okay)
+ return XEN_NETIF_CTRL_STATUS_INVALID_PARAMETER;
+ }
+
+ return XEN_NETIF_CTRL_STATUS_SUCCESS;
+}
+
+int xenvif_init_hash(struct xenvif *vif)
+{
+ if (xenvif_hash_cache_size == 0)
+ return 0;
+
+ vif->hash.cache.entry =
+ vzalloc(xenvif_hash_cache_size *
+ sizeof(struct xenvif_hash_cache_entry));
+
+ if (!vif->hash.cache.entry)
+ return -ENOMEM;
+
+ rwlock_init(&vif->hash.cache.lock);
+ return 0;
+}
+
+void xenvif_deinit_hash(struct xenvif *vif)
+{
+ if (vif->hash.cache.entry)
+ vfree(vif->hash.cache.entry);
+
+ memset(&vif->hash, 0, sizeof(vif->hash));
+}
diff --git a/drivers/net/xen-netback/interface.c
b/drivers/net/xen-netback/interface.c
index 78a10d2..e54b475 100644
--- a/drivers/net/xen-netback/interface.c
+++ b/drivers/net/xen-netback/interface.c
@@ -151,6 +151,24 @@ void xenvif_wake_queue(struct xenvif_queue *queue)
netif_tx_wake_queue(netdev_get_tx_queue(dev, id));
}
+static u16 xenvif_select_queue(struct net_device *dev, struct sk_buff *skb,
+ void *accel_priv,
+ select_queue_fallback_t fallback)
+{
+ struct xenvif *vif = netdev_priv(dev);
+ unsigned int size = vif->hash.size;
+
+ if (vif->hash.alg == XEN_NETIF_CTRL_HASH_ALGORITHM_NONE)
+ return fallback(dev, skb) % dev->real_num_tx_queues;
+
+ xenvif_set_skb_hash(vif, skb);
+
+ if (size == 0)
+ return skb_get_hash_raw(skb) % dev->real_num_tx_queues;
+
+ return vif->hash.mapping[skb_get_hash_raw(skb) % size];
+}
+
static int xenvif_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct xenvif *vif = netdev_priv(dev);
@@ -395,6 +413,7 @@ static const struct ethtool_ops xenvif_ethtool_ops = {
};
static const struct net_device_ops xenvif_netdev_ops = {
+ .ndo_select_queue = xenvif_select_queue,
.ndo_start_xmit = xenvif_start_xmit,
.ndo_get_stats = xenvif_get_stats,
.ndo_open = xenvif_open,
@@ -563,6 +582,10 @@ int xenvif_connect_ctrl(struct xenvif *vif, grant_ref_t
ring_ref,
vif->ctrl_irq = err;
+ err = xenvif_init_hash(vif);
+ if (err < 0)
+ goto err_unbind;
+
task = kthread_create(xenvif_ctrl_kthread, (void *)vif,
"%s-control", dev->name);
if (IS_ERR(task)) {
@@ -579,6 +602,9 @@ int xenvif_connect_ctrl(struct xenvif *vif, grant_ref_t
ring_ref,
return 0;
err_deinit:
+ xenvif_deinit_hash(vif);
+
+err_unbind:
unbind_from_irqhandler(vif->ctrl_irq, vif);
vif->ctrl_irq = 0;
@@ -749,6 +775,8 @@ void xenvif_disconnect_ctrl(struct xenvif *vif)
vif->ctrl_task = NULL;
}
+ xenvif_deinit_hash(vif);
+
if (vif->ctrl_irq) {
unbind_from_irqhandler(vif->ctrl_irq, vif);
vif->ctrl_irq = 0;
diff --git a/drivers/net/xen-netback/netback.c
b/drivers/net/xen-netback/netback.c
index 45aa40b..6509d11 100644
--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -89,6 +89,11 @@ module_param(fatal_skb_slots, uint, 0444);
*/
#define XEN_NETBACK_TX_COPY_LEN 128
+/* This is the maximum number of flows in the hash cache. */
+#define XENVIF_HASH_CACHE_SIZE_DEFAULT 64
+unsigned int xenvif_hash_cache_size = XENVIF_HASH_CACHE_SIZE_DEFAULT;
+module_param_named(hash_cache_size, xenvif_hash_cache_size, uint, 0644);
+MODULE_PARM_DESC(hash_cache_size, "Number of flows in the hash cache");
static void xenvif_idx_release(struct xenvif_queue *queue, u16 pending_idx,
u8 status);
@@ -2191,8 +2196,48 @@ static void push_ctrl_response(struct xenvif *vif)
static void process_ctrl_request(struct xenvif *vif,
const struct xen_netif_ctrl_request *req)
{
- make_ctrl_response(vif, req, XEN_NETIF_CTRL_STATUS_NOT_SUPPORTED,
- 0);
+ u32 status = XEN_NETIF_CTRL_STATUS_NOT_SUPPORTED;
+ u32 data = 0;
+
+ switch (req->type) {
+ case XEN_NETIF_CTRL_TYPE_SET_HASH_ALGORITHM:
+ status = xenvif_set_hash_alg(vif, req->data[0]);
+ break;
+
+ case XEN_NETIF_CTRL_TYPE_GET_HASH_FLAGS:
+ status = xenvif_get_hash_flags(vif, &data);
+ break;
+
+ case XEN_NETIF_CTRL_TYPE_SET_HASH_FLAGS:
+ status = xenvif_set_hash_flags(vif, req->data[0]);
+ break;
+
+ case XEN_NETIF_CTRL_TYPE_SET_HASH_KEY:
+ status = xenvif_set_hash_key(vif, req->data[0],
+ req->data[1]);
+ break;
+
+ case XEN_NETIF_CTRL_TYPE_GET_HASH_MAPPING_SIZE:
+ status = XEN_NETIF_CTRL_STATUS_SUCCESS;
+ data = XEN_NETBK_MAX_HASH_MAPPING_SIZE;
+ break;
+
+ case XEN_NETIF_CTRL_TYPE_SET_HASH_MAPPING_SIZE:
+ status = xenvif_set_hash_mapping_size(vif,
+ req->data[0]);
+ break;
+
+ case XEN_NETIF_CTRL_TYPE_SET_HASH_MAPPING:
+ status = xenvif_set_hash_mapping(vif, req->data[0],
+ req->data[1],
+ req->data[2]);
+ break;
+
+ default:
+ break;
+ }
+
+ make_ctrl_response(vif, req, status, data);
push_ctrl_response(vif);
}
--
2.1.4
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