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xen-netback: add control protocol implementation

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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@citrix.com>
Cc: Wei Liu <wei.liu2@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 09:37:27 +01:00 • committed by David S. Miller
parent 4e15ee2cb4
commit 40d8abdee8
5 changed files with 502 additions and 3 deletions
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49
drivers/net/xen-netback/netback.c
View file

@ -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);
@ -2192,8 +2197,48 @@ 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);
}