diff options
Diffstat (limited to 'drivers/net/hyperv/netvsc.c')
| -rw-r--r-- | drivers/net/hyperv/netvsc.c | 35 |
1 files changed, 31 insertions, 4 deletions
diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c index 5bce24731502..9d07c9ce4be2 100644 --- a/drivers/net/hyperv/netvsc.c +++ b/drivers/net/hyperv/netvsc.c @@ -31,12 +31,13 @@ * Switch the data path from the synthetic interface to the VF * interface. */ -void netvsc_switch_datapath(struct net_device *ndev, bool vf) +int netvsc_switch_datapath(struct net_device *ndev, bool vf) { struct net_device_context *net_device_ctx = netdev_priv(ndev); struct hv_device *dev = net_device_ctx->device_ctx; struct netvsc_device *nv_dev = rtnl_dereference(net_device_ctx->nvdev); struct nvsp_message *init_pkt = &nv_dev->channel_init_pkt; + int ret, retry = 0; /* Block sending traffic to VF if it's about to be gone */ if (!vf) @@ -51,15 +52,41 @@ void netvsc_switch_datapath(struct net_device *ndev, bool vf) init_pkt->msg.v4_msg.active_dp.active_datapath = NVSP_DATAPATH_SYNTHETIC; +again: trace_nvsp_send(ndev, init_pkt); - vmbus_sendpacket(dev->channel, init_pkt, + ret = vmbus_sendpacket(dev->channel, init_pkt, sizeof(struct nvsp_message), - (unsigned long)init_pkt, - VM_PKT_DATA_INBAND, + (unsigned long)init_pkt, VM_PKT_DATA_INBAND, VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); + + /* If failed to switch to/from VF, let data_path_is_vf stay false, + * so we use synthetic path to send data. + */ + if (ret) { + if (ret != -EAGAIN) { + netdev_err(ndev, + "Unable to send sw datapath msg, err: %d\n", + ret); + return ret; + } + + if (retry++ < RETRY_MAX) { + usleep_range(RETRY_US_LO, RETRY_US_HI); + goto again; + } else { + netdev_err( + ndev, + "Retry failed to send sw datapath msg, err: %d\n", + ret); + return ret; + } + } + wait_for_completion(&nv_dev->channel_init_wait); net_device_ctx->data_path_is_vf = vf; + + return 0; } /* Worker to setup sub channels on initial setup |