From 8ea4fae926afd81f4d7fd43444562afc8629f77c Mon Sep 17 00:00:00 2001 From: Ganesh Goudar Date: Mon, 5 Jun 2017 18:34:20 +0530 Subject: [PATCH] cxgb4: implement ndo_set_vf_rate() Implement ndo_set_vf_rate() for mgmt interface to support rate-limiting of VF traffic using 'ip' command. Based on the original work of Kumar Sanghvi Signed-off-by: Ganesh Goudar Signed-off-by: David S. Miller --- drivers/net/ethernet/chelsio/cxgb4/cxgb4.h | 1 + drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c | 106 ++++++++++++++++++++++++ 2 files changed, 107 insertions(+) diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4.h b/drivers/net/ethernet/chelsio/cxgb4/cxgb4.h index 1cf3e2f..b7a92eb 100644 --- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4.h +++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4.h @@ -777,6 +777,7 @@ struct uld_msix_info { struct vf_info { unsigned char vf_mac_addr[ETH_ALEN]; + unsigned int tx_rate; bool pf_set_mac; }; diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c index 8c69046..64af406 100644 --- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c +++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c @@ -2563,6 +2563,8 @@ static int cxgb_get_vf_config(struct net_device *dev, if (vf >= adap->num_vfs) return -EINVAL; ivi->vf = vf; + ivi->max_tx_rate = adap->vfinfo[vf].tx_rate; + ivi->min_tx_rate = 0; ether_addr_copy(ivi->mac, adap->vfinfo[vf].vf_mac_addr); return 0; } @@ -2579,6 +2581,109 @@ static int cxgb_get_phys_port_id(struct net_device *dev, return 0; } +static int cxgb_set_vf_rate(struct net_device *dev, int vf, int min_tx_rate, + int max_tx_rate) +{ + struct port_info *pi = netdev_priv(dev); + struct adapter *adap = pi->adapter; + struct fw_port_cmd port_cmd, port_rpl; + u32 link_status, speed = 0; + u32 fw_pfvf, fw_class; + int class_id = vf; + int link_ok, ret; + u16 pktsize; + + if (vf >= adap->num_vfs) + return -EINVAL; + + if (min_tx_rate) { + dev_err(adap->pdev_dev, + "Min tx rate (%d) (> 0) for VF %d is Invalid.\n", + min_tx_rate, vf); + return -EINVAL; + } + /* Retrieve link details for VF port */ + memset(&port_cmd, 0, sizeof(port_cmd)); + port_cmd.op_to_portid = cpu_to_be32(FW_CMD_OP_V(FW_PORT_CMD) | + FW_CMD_REQUEST_F | + FW_CMD_READ_F | + FW_PORT_CMD_PORTID_V(pi->port_id)); + port_cmd.action_to_len16 = + cpu_to_be32(FW_PORT_CMD_ACTION_V(FW_PORT_ACTION_GET_PORT_INFO) | + FW_LEN16(port_cmd)); + ret = t4_wr_mbox(adap, adap->mbox, &port_cmd, sizeof(port_cmd), + &port_rpl); + if (ret != FW_SUCCESS) { + dev_err(adap->pdev_dev, + "Failed to get link status for VF %d\n", vf); + return -EINVAL; + } + link_status = be32_to_cpu(port_rpl.u.info.lstatus_to_modtype); + link_ok = (link_status & FW_PORT_CMD_LSTATUS_F) != 0; + if (!link_ok) { + dev_err(adap->pdev_dev, "Link down for VF %d\n", vf); + return -EINVAL; + } + /* Determine link speed */ + if (link_status & FW_PORT_CMD_LSPEED_V(FW_PORT_CAP_SPEED_100M)) + speed = 100; + else if (link_status & FW_PORT_CMD_LSPEED_V(FW_PORT_CAP_SPEED_1G)) + speed = 1000; + else if (link_status & FW_PORT_CMD_LSPEED_V(FW_PORT_CAP_SPEED_10G)) + speed = 10000; + else if (link_status & FW_PORT_CMD_LSPEED_V(FW_PORT_CAP_SPEED_25G)) + speed = 25000; + else if (link_status & FW_PORT_CMD_LSPEED_V(FW_PORT_CAP_SPEED_40G)) + speed = 40000; + else if (link_status & FW_PORT_CMD_LSPEED_V(FW_PORT_CAP_SPEED_100G)) + speed = 100000; + + if (max_tx_rate > speed) { + dev_err(adap->pdev_dev, + "Max tx rate %d for VF %d can't be > link-speed %u", + max_tx_rate, vf, speed); + return -EINVAL; + } + pktsize = be16_to_cpu(port_rpl.u.info.mtu); + /* subtract ethhdr size and 4 bytes crc since, f/w appends it */ + pktsize = pktsize - sizeof(struct ethhdr) - 4; + /* subtract ipv4 hdr size, tcp hdr size to get typical IPv4 MSS size */ + pktsize = pktsize - sizeof(struct iphdr) - sizeof(struct tcphdr); + /* configure Traffic Class for rate-limiting */ + ret = t4_sched_params(adap, SCHED_CLASS_TYPE_PACKET, + SCHED_CLASS_LEVEL_CL_RL, + SCHED_CLASS_MODE_CLASS, + SCHED_CLASS_RATEUNIT_BITS, + SCHED_CLASS_RATEMODE_ABS, + pi->port_id, class_id, 0, + max_tx_rate * 1000, 0, pktsize); + if (ret) { + dev_err(adap->pdev_dev, "Err %d for Traffic Class config\n", + ret); + return -EINVAL; + } + dev_info(adap->pdev_dev, + "Class %d with MSS %u configured with rate %u\n", + class_id, pktsize, max_tx_rate); + + /* bind VF to configured Traffic Class */ + fw_pfvf = (FW_PARAMS_MNEM_V(FW_PARAMS_MNEM_PFVF) | + FW_PARAMS_PARAM_X_V(FW_PARAMS_PARAM_PFVF_SCHEDCLASS_ETH)); + fw_class = class_id; + ret = t4_set_params(adap, adap->mbox, adap->pf, vf + 1, 1, &fw_pfvf, + &fw_class); + if (ret) { + dev_err(adap->pdev_dev, + "Err %d in binding VF %d to Traffic Class %d\n", + ret, vf, class_id); + return -EINVAL; + } + dev_info(adap->pdev_dev, "PF %d VF %d is bound to Class %d\n", + adap->pf, vf, class_id); + adap->vfinfo[vf].tx_rate = max_tx_rate; + return 0; +} + #endif static int cxgb_set_mac_addr(struct net_device *dev, void *p) @@ -2766,6 +2871,7 @@ static const struct net_device_ops cxgb4_mgmt_netdev_ops = { .ndo_open = dummy_open, .ndo_set_vf_mac = cxgb_set_vf_mac, .ndo_get_vf_config = cxgb_get_vf_config, + .ndo_set_vf_rate = cxgb_set_vf_rate, .ndo_get_phys_port_id = cxgb_get_phys_port_id, }; #endif -- 2.7.4