diff options
Diffstat (limited to 'drivers/net/ethernet/qualcomm/rmnet/rmnet_map_command.c')
-rw-r--r-- | drivers/net/ethernet/qualcomm/rmnet/rmnet_map_command.c | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_command.c b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_command.c new file mode 100644 index 000000000000..d1ea5e21b982 --- /dev/null +++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_command.c @@ -0,0 +1,106 @@ +/* Copyright (c) 2013-2017, The Linux Foundation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/netdevice.h> +#include "rmnet_config.h" +#include "rmnet_map.h" +#include "rmnet_private.h" +#include "rmnet_vnd.h" + +static u8 rmnet_map_do_flow_control(struct sk_buff *skb, + struct rmnet_port *rdinfo, + int enable) +{ + struct rmnet_map_control_command *cmd; + struct rmnet_endpoint *ep; + struct net_device *vnd; + u16 ip_family; + u16 fc_seq; + u32 qos_id; + u8 mux_id; + int r; + + mux_id = RMNET_MAP_GET_MUX_ID(skb); + cmd = RMNET_MAP_GET_CMD_START(skb); + + if (mux_id >= RMNET_MAX_LOGICAL_EP) { + kfree_skb(skb); + return RX_HANDLER_CONSUMED; + } + + ep = &rdinfo->muxed_ep[mux_id]; + vnd = ep->egress_dev; + + ip_family = cmd->flow_control.ip_family; + fc_seq = ntohs(cmd->flow_control.flow_control_seq_num); + qos_id = ntohl(cmd->flow_control.qos_id); + + /* Ignore the ip family and pass the sequence number for both v4 and v6 + * sequence. User space does not support creating dedicated flows for + * the 2 protocols + */ + r = rmnet_vnd_do_flow_control(vnd, enable); + if (r) { + kfree_skb(skb); + return RMNET_MAP_COMMAND_UNSUPPORTED; + } else { + return RMNET_MAP_COMMAND_ACK; + } +} + +static void rmnet_map_send_ack(struct sk_buff *skb, + unsigned char type) +{ + struct rmnet_map_control_command *cmd; + int xmit_status; + + skb->protocol = htons(ETH_P_MAP); + + cmd = RMNET_MAP_GET_CMD_START(skb); + cmd->cmd_type = type & 0x03; + + netif_tx_lock(skb->dev); + xmit_status = skb->dev->netdev_ops->ndo_start_xmit(skb, skb->dev); + netif_tx_unlock(skb->dev); +} + +/* Process MAP command frame and send N/ACK message as appropriate. Message cmd + * name is decoded here and appropriate handler is called. + */ +rx_handler_result_t rmnet_map_command(struct sk_buff *skb, + struct rmnet_port *port) +{ + struct rmnet_map_control_command *cmd; + unsigned char command_name; + unsigned char rc = 0; + + cmd = RMNET_MAP_GET_CMD_START(skb); + command_name = cmd->command_name; + + switch (command_name) { + case RMNET_MAP_COMMAND_FLOW_ENABLE: + rc = rmnet_map_do_flow_control(skb, port, 1); + break; + + case RMNET_MAP_COMMAND_FLOW_DISABLE: + rc = rmnet_map_do_flow_control(skb, port, 0); + break; + + default: + rc = RMNET_MAP_COMMAND_UNSUPPORTED; + kfree_skb(skb); + break; + } + if (rc == RMNET_MAP_COMMAND_ACK) + rmnet_map_send_ack(skb, rc); + return RX_HANDLER_CONSUMED; +} |