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xen-netback: pass hash value to the frontend 

My recent patch to include/xen/interface/io/netif.h defines a new extra
info type that can be used to pass hash values between backend and guest
frontend.

This patch adds code to xen-netback to pass hash values calculated for
guest receive-side packets (i.e. netback transmit side) to the frontend.

Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paul Durrant 2016-05-13 09:37:28 +01:00 committed by David S. Miller
parent 40d8abdee8
commit f07f989338
2 changed files with 77 additions and 14 deletions
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13
drivers/net/xen-netback/interface.c
View File

@ -158,8 +158,17 @@ static u16 xenvif_select_queue(struct net_device *dev, struct sk_buff *skb,
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;
if (vif->hash.alg == XEN_NETIF_CTRL_HASH_ALGORITHM_NONE) {
u16 index = fallback(dev, skb) % dev->real_num_tx_queues;
/* Make sure there is no hash information in the socket
* buffer otherwise it would be incorrectly forwarded
* to the frontend.
*/
skb_clear_hash(skb);
return index;
}
xenvif_set_skb_hash(vif, skb);

78
drivers/net/xen-netback/netback.c
View File

@ -168,6 +168,8 @@ static bool xenvif_rx_ring_slots_available(struct xenvif_queue *queue)
needed = DIV_ROUND_UP(skb->len, XEN_PAGE_SIZE);
if (skb_is_gso(skb))
needed++;
if (skb->sw_hash)
needed++;
do {
prod = queue->rx.sring->req_prod;
@ -285,6 +287,8 @@ struct gop_frag_copy {
struct xenvif_rx_meta *meta;
int head;
int gso_type;
int protocol;
int hash_present;
struct page *page;
};
@ -331,8 +335,15 @@ static void xenvif_setup_copy_gop(unsigned long gfn,
npo->copy_off += *len;
info->meta->size += *len;
if (!info->head)
return;
/* Leave a gap for the GSO descriptor. */
if (info->head && ((1 << info->gso_type) & queue->vif->gso_mask))
if ((1 << info->gso_type) & queue->vif->gso_mask)
queue->rx.req_cons++;
/* Leave a gap for the hash extra segment. */
if (info->hash_present)
queue->rx.req_cons++;
info->head = 0; /* There must be something in this buffer now */
@ -367,6 +378,11 @@ static void xenvif_gop_frag_copy(struct xenvif_queue *queue, struct sk_buff *skb
.npo = npo,
.head = *head,
.gso_type = XEN_NETIF_GSO_TYPE_NONE,
/* xenvif_set_skb_hash() will have either set a s/w
* hash or cleared the hash depending on
* whether the the frontend wants a hash for this skb.
*/
.hash_present = skb->sw_hash,
};
unsigned long bytes;
@ -555,6 +571,7 @@ void xenvif_kick_thread(struct xenvif_queue *queue)
static void xenvif_rx_action(struct xenvif_queue *queue)
{
struct xenvif *vif = queue->vif;
s8 status;
u16 flags;
struct xen_netif_rx_response *resp;
@ -590,9 +607,10 @@ static void xenvif_rx_action(struct xenvif_queue *queue)
gnttab_batch_copy(queue->grant_copy_op, npo.copy_prod);
while ((skb = __skb_dequeue(&rxq)) != NULL) {
struct xen_netif_extra_info *extra = NULL;
if ((1 << queue->meta[npo.meta_cons].gso_type) &
queue->vif->gso_prefix_mask) {
vif->gso_prefix_mask) {
resp = RING_GET_RESPONSE(&queue->rx,
queue->rx.rsp_prod_pvt++);
@ -610,7 +628,7 @@ static void xenvif_rx_action(struct xenvif_queue *queue)
queue->stats.tx_bytes += skb->len;
queue->stats.tx_packets++;
status = xenvif_check_gop(queue->vif,
status = xenvif_check_gop(vif,
XENVIF_RX_CB(skb)->meta_slots_used,
&npo);
@ -632,21 +650,57 @@ static void xenvif_rx_action(struct xenvif_queue *queue)
flags);
if ((1 << queue->meta[npo.meta_cons].gso_type) &
queue->vif->gso_mask) {
struct xen_netif_extra_info *gso =
(struct xen_netif_extra_info *)
vif->gso_mask) {
extra = (struct xen_netif_extra_info *)
RING_GET_RESPONSE(&queue->rx,
queue->rx.rsp_prod_pvt++);
resp->flags |= XEN_NETRXF_extra_info;
gso->u.gso.type = queue->meta[npo.meta_cons].gso_type;
gso->u.gso.size = queue->meta[npo.meta_cons].gso_size;
gso->u.gso.pad = 0;
gso->u.gso.features = 0;
extra->u.gso.type = queue->meta[npo.meta_cons].gso_type;
extra->u.gso.size = queue->meta[npo.meta_cons].gso_size;
extra->u.gso.pad = 0;
extra->u.gso.features = 0;
gso->type = XEN_NETIF_EXTRA_TYPE_GSO;
gso->flags = 0;
extra->type = XEN_NETIF_EXTRA_TYPE_GSO;
extra->flags = 0;
}
if (skb->sw_hash) {
/* Since the skb got here via xenvif_select_queue()
* we know that the hash has been re-calculated
* according to a configuration set by the frontend
* and therefore we know that it is legitimate to
* pass it to the frontend.
*/
if (resp->flags & XEN_NETRXF_extra_info)
extra->flags |= XEN_NETIF_EXTRA_FLAG_MORE;
else
resp->flags |= XEN_NETRXF_extra_info;
extra = (struct xen_netif_extra_info *)
RING_GET_RESPONSE(&queue->rx,
queue->rx.rsp_prod_pvt++);
extra->u.hash.algorithm =
XEN_NETIF_CTRL_HASH_ALGORITHM_TOEPLITZ;
if (skb->l4_hash)
extra->u.hash.type =
skb->protocol == htons(ETH_P_IP) ?
_XEN_NETIF_CTRL_HASH_TYPE_IPV4_TCP :
_XEN_NETIF_CTRL_HASH_TYPE_IPV6_TCP;
else
extra->u.hash.type =
skb->protocol == htons(ETH_P_IP) ?
_XEN_NETIF_CTRL_HASH_TYPE_IPV4 :
_XEN_NETIF_CTRL_HASH_TYPE_IPV6;
*(uint32_t *)extra->u.hash.value =
skb_get_hash_raw(skb);
extra->type = XEN_NETIF_EXTRA_TYPE_HASH;
extra->flags = 0;
}
xenvif_add_frag_responses(queue, status,