/* Broadcom NetXtreme-C/E network driver.
*
* Copyright (c) 2016-2017 Broadcom Limited
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation.
*/
#include <linux/pci.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/rtnetlink.h>
#include <linux/jhash.h>
#include <net/pkt_cls.h>
#include "bnxt_hsi.h"
#include "bnxt.h"
#include "bnxt_hwrm.h"
#include "bnxt_vfr.h"
#include "bnxt_devlink.h"
#include "bnxt_tc.h"
#ifdef CONFIG_BNXT_SRIOV
#define CFA_HANDLE_INVALID 0xffff
#define VF_IDX_INVALID 0xffff
static int hwrm_cfa_vfr_alloc(struct bnxt *bp, u16 vf_idx,
u16 *tx_cfa_action, u16 *rx_cfa_code)
{
struct hwrm_cfa_vfr_alloc_output *resp;
struct hwrm_cfa_vfr_alloc_input *req;
int rc;
rc = hwrm_req_init(bp, req, HWRM_CFA_VFR_ALLOC);
if (!rc) {
req->vf_id = cpu_to_le16(vf_idx);
sprintf(req->vfr_name, "vfr%d", vf_idx);
resp = hwrm_req_hold(bp, req);
rc = hwrm_req_send(bp, req);
if (!rc) {
*tx_cfa_action = le16_to_cpu(resp->tx_cfa_action);
*rx_cfa_code = le16_to_cpu(resp->rx_cfa_code);
netdev_dbg(bp->dev, "tx_cfa_action=0x%x, rx_cfa_code=0x%x",
*tx_cfa_action, *rx_cfa_code);
}
hwrm_req_drop(bp, req);
}
if (rc)
netdev_info(bp->dev, "%s error rc=%d\n", __func__, rc);
return rc;
}
static int hwrm_cfa_vfr_free(struct bnxt *bp, u16 vf_idx)
{
struct hwrm_cfa_vfr_free_input *req;
int rc;
rc = hwrm_req_init(bp, req, HWRM_CFA_VFR_FREE);
if (!rc) {
sprintf(req->vfr_name, "vfr%d", vf_idx);
rc = hwrm_req_send(bp, req);
}
if (rc)
netdev_info(bp->dev, "%s error rc=%d\n", __func__, rc);
return rc;
}
static int bnxt_hwrm_vfr_qcfg(struct bnxt *bp, struct bnxt_vf_rep *vf_rep,
u16 *max_mtu)
{
struct hwrm_func_qcfg_output *resp;
struct hwrm_func_qcfg_input *req;
u16 mtu;
int rc;
rc = hwrm_req_init(bp, req, HWRM_FUNC_QCFG);
if (rc)
return rc;
req->fid = cpu_to_le16(bp->pf.vf[vf_rep->vf_idx].fw_fid);
resp = hwrm_req_hold(bp, req);
rc = hwrm_req_send(bp, req);
if (!rc) {
mtu = le16_to_cpu(resp->max_mtu_configured);
if (!mtu)
*max_mtu = BNXT_MAX_MTU;
else
*max_mtu = mtu;
}
hwrm_req_drop(bp, req);
return rc;
}
static int bnxt_vf_rep_open(struct net_device *dev)
{
struct bnxt_vf_rep *vf_rep = netdev_priv(dev);
struct bnxt *bp = vf_rep->bp;
/* Enable link and TX only if the parent PF is open. */
if (netif_running(bp->dev)) {
netif_carrier_on(dev);
netif_tx_start_all_queues(dev);
}
return 0;
}
static int bnxt_vf_rep_close(struct net_device *dev)
{
netif_carrier_off(dev);
netif_tx_disable(dev);
return 0;
}
static netdev_tx_t bnxt_vf_rep_xmit(struct sk_buff *skb,
struct net_device *dev)
{
struct bnxt_vf_rep *vf_rep = netdev_priv(dev);
int rc, len = skb->len;
skb_dst_drop(skb);
dst_hold((struct dst_entry *)vf_rep->dst);
skb_dst_set(skb, (struct dst_entry *)vf_rep->dst);
skb->dev = vf_rep->dst->u.port_info.lower_dev;
rc = dev_queue_xmit(skb);
if (!rc) {
vf_rep->tx_stats.packets++;
vf_rep->tx_stats.bytes += len;
}
return rc;
}
static void
bnxt_vf_rep_get_stats64(struct net_device *dev,
struct rtnl_link_stats64 *stats)
{
struct bnxt_vf_rep *vf_rep = netdev_priv(dev);
stats->rx_packets = vf_rep->rx_stats.packets;
stats->rx_bytes = vf_rep->rx_stats.bytes;
stats->tx_packets = vf_rep->tx_stats.packets;
stats->tx_bytes = vf_rep->tx_stats.bytes;
}
static int bnxt_vf_rep_setup_tc_block_cb(enum tc_setup_type type,
void *type_data,
void *cb_priv)
{
struct bnxt_vf_rep *vf_rep = cb_priv;
struct bnxt *bp = vf_rep->bp;
int vf_fid = bp->pf.vf[vf_rep->vf_idx].fw_fid;
if (!bnxt_tc_flower_enabled(vf_rep->bp) ||
!tc_cls_can_offload_and_chain0(bp->dev, type_data))
return -EOPNOTSUPP;
switch (type) {
case TC_SETUP_CLSFLOWER:
return bnxt_tc_setup_flower(bp, vf_fid, type_data);
default:
return -EOPNOTSUPP;
}
}
static LIST_HEAD(bnxt_vf_block_cb_list);
static int bnxt_vf_rep_setup_tc(struct net_device *dev, enum tc_setup_type type,
void *type_data)
{
struct bnxt_vf_rep *vf_rep = netdev_priv(dev);
switch (type) {
case TC_SETUP_BLOCK:
return flow_block_cb_setup_simple(type_data,
&bnxt_vf_block_cb_list,
bnxt_vf_rep_setup_tc_block_cb,
vf_rep, vf_rep, true);
default:
return -EOPNOTSUPP;
}
}
struct net_device *bnxt_get_vf_rep(struct bnxt *bp, u16 cfa_code)
{
u16 vf_idx;
if (cfa_code && bp->cfa_code_map && BNXT_PF(bp)) {
vf_idx = bp->cfa_code_map[cfa_code];
if (vf_idx != VF_IDX_INVALID)
return bp->vf_reps[vf_idx]->dev;
}
return NULL;
}
void bnxt_vf_rep_rx(struct bnxt *bp, struct sk_buff *skb)
{
struct bnxt_vf_rep *vf_rep = netdev_priv(skb->dev);
vf_rep->rx_stats.bytes += skb->len;
vf_rep->rx_stats.packets++;
netif_receive_skb(skb);
}
static int bnxt_vf_rep_get_phys_port_name(struct net_device *dev, char *buf,
size_t len)
{
struct bnxt_vf_rep *vf_rep = netdev_priv(dev);
struct pci_dev *pf_pdev = vf_rep->bp->pdev;
int rc;
rc = snprintf(buf, len, "pf%dvf%d", PCI_FUNC(pf_pdev->devfn),
vf_rep->vf_idx);
if (rc >= len)
return -EOPNOTSUPP;
return 0;
}
static void bnxt_vf_rep_get_drvinfo(struct net_device *dev,
struct ethtool_drvinfo *info)
{
strscpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
}
static int bnxt_vf_rep_get_port_parent_id(struct net_device *dev,
struct netdev_phys_item_id *ppid)
{
struct bnxt_vf_rep *vf_rep = netdev_priv(dev);
/* as only PORT_PARENT_ID is supported currently use common code
* between PF and VF-rep for now.
*/
return bnxt_get_port_parent_id(vf_rep->bp->dev, ppid);
}
static const struct ethtool_ops bnxt_vf_rep_ethtool_ops = {
.get_drvinfo = bnxt_vf_rep_get_drvinfo
};
static const struct net_device_ops bnxt_vf_rep_netdev_ops = {
.ndo_open = bnxt_vf_rep_open,
.ndo_stop = bnxt_vf_rep_close,
.ndo_start_xmit = bnxt_vf_rep_xmit,
.ndo_get_stats64 = bnxt_vf_rep_get_stats64,
.ndo_setup_tc = bnxt_vf_rep_setup_tc,
.ndo_get_port_parent_id = bnxt_vf_rep_get_port_parent_id,
.ndo_get_phys_port_name = bnxt_vf_rep_get_phys_port_name
};
bool bnxt_dev_is_vf_rep(struct net_device *dev)
{
return dev->netdev_ops == &bnxt_vf_rep_netdev_ops;
}
/* Called when the parent PF interface is closed:
* As the mode transition from SWITCHDEV to LEGACY
* happens under the rtnl_lock() this routine is safe
* under the rtnl_lock()
*/
void bnxt_vf_reps_close(struct bnxt *bp)
{
struct bnxt_vf_rep *vf_rep;
u16 num_vfs, i;
if (bp->eswitch_mode != DEVLINK_ESWITCH_MODE_SWITCHDEV)
return;
num_vfs = pci_num_vf(bp->pdev);
for (i = 0; i < num_vfs; i++) {
vf_rep = bp->vf_reps[i];
if (netif_running(vf_rep->dev))
bnxt_vf_rep_close(vf_rep->dev);
}
}
/* Called when the parent PF interface is opened (re-opened):
* As the mode transition from SWITCHDEV to LEGACY
* happen under the rtnl_lock() this routine is safe
* under the rtnl_lock()
*/
void bnxt_vf_reps_open(struct bnxt *bp)
{
int i;
if (bp->eswitch_mode != DEVLINK_ESWITCH_MODE_SWITCHDEV)
return;
for (i = 0; i < pci_num_vf(bp->pdev); i++) {
/* Open the VF-Rep only if it is allocated in the FW */
if (bp->vf_reps[i]->tx_cfa_action != CFA_HANDLE_INVALID)
bnxt_vf_rep_open(bp->vf_reps[i]->dev);
}
}
static void __bnxt_free_one_vf_rep(struct bnxt *bp, struct bnxt_vf_rep *vf_rep)
{
if (!vf_rep)
return;
if (vf_rep->dst) {
dst_release((struct dst_entry *)vf_rep->dst);
vf_rep->dst = NULL;
}
if (vf_rep->tx_cfa_action != CFA_HANDLE_INVALID) {
hwrm_cfa_vfr_free(bp, vf_rep->vf_idx);
vf_rep->tx_cfa_action = CFA_HANDLE_INVALID;
}
}
static void __bnxt_vf_reps_destroy(struct bnxt *bp)
{
u16 num_vfs = pci_num_vf(bp->pdev);
struct bnxt_vf_rep *vf_rep;
int i;
for (i = 0; i < num_vfs; i++) {
vf_rep = bp->vf_reps[i];
if (vf_rep) {
__bnxt_free_one_vf_rep(bp, vf_rep);
if (vf_rep->dev) {
/* if register_netdev failed, then netdev_ops
* would have been set to NULL
*/
if (vf_rep->dev->netdev_ops)
unregister_netdev(vf_rep->dev);
free_netdev(vf_rep->dev);
}
}
}
kfree(bp->vf_reps);
bp->vf_reps = NULL;
}
void bnxt_vf_reps_destroy(struct bnxt *bp)
{
bool closed = false;
if (bp->eswitch_mode != DEVLINK_ESWITCH_MODE_SWITCHDEV)
return;
if (!bp->vf_reps)
return;
/* Ensure that parent PF's and VF-reps' RX/TX has been quiesced
* before proceeding with VF-rep cleanup.
*/
rtnl_lock();
if (netif_running(bp->dev)) {
bnxt_close_nic(bp, false, false);
closed = true;
}
/* un-publish cfa_code_map so that RX path can't see it anymore */
kfree(bp->cfa_code_map);
bp->cfa_code_map = NULL;
if (closed) {
/* Temporarily set legacy mode to avoid re-opening
* representors and restore switchdev mode after that.
*/
bp->eswitch_mode = DEVLINK_ESWITCH_MODE_LEGACY;
bnxt_open_nic(bp, false, false);
bp->eswitch_mode = DEVLINK_ESWITCH_MODE_SWITCHDEV;
}
rtnl_unlock();
/* Need to call vf_reps_destroy() outside of rntl_lock
* as unregister_netdev takes rtnl_lock
*/
__bnxt_vf_reps_destroy(bp);
}
/* Free the VF-Reps in firmware, during firmware hot-reset processing.
* Note that the VF-Rep netdevs are still active (not unregistered) during
* this process. As the mode transition from SWITCHDEV to LEGACY happens
* under the rtnl_lock() this routine is safe under the rtnl_lock().
*/
void bnxt_vf_reps_free(struct bnxt *bp)
{
u16 num_vfs = pci_num_vf(bp->pdev);
int i;
if (bp->eswitch_mode != DEVLINK_ESWITCH_MODE_SWITCHDEV)
return;
for (i = 0; i < num_vfs; i++)
__bnxt_free_one_vf_rep(bp, bp->vf_reps[i]);
}
static int bnxt_alloc_vf_rep(struct bnxt *bp, struct bnxt_vf_rep *vf_rep,
u16 *cfa_code_map)
{
/* get cfa handles from FW */
if (hwrm_cfa_vfr_alloc(bp, vf_rep->vf_idx, &vf_rep->tx_cfa_action,
&vf_rep->rx_cfa_code))
return -ENOLINK;
cfa_code_map[vf_rep->rx_cfa_code] = vf_rep->vf_idx;
vf_rep->dst = metadata_dst_alloc(0, METADATA_HW_PORT_MUX, GFP_KERNEL);
if (!vf_rep->dst)
return -ENOMEM;
/* only cfa_action is needed to mux a packet while TXing */
vf_rep->dst->u.port_info.port_id = vf_rep->tx_cfa_action;
vf_rep->dst->u.port_info.lower_dev = bp->dev;
return 0;
}
/* Allocate the VF-Reps in firmware, during firmware hot-reset processing.
* Note that the VF-Rep netdevs are still active (not unregistered) during
* this process. As the mode transition from SWITCHDEV to LEGACY happens
* under the rtnl_lock() this routine is safe under the rtnl_lock().
*/
int bnxt_vf_reps_alloc(struct bnxt *bp)
{
u16 *cfa_code_map = bp->cfa_code_map, num_vfs = pci_num_vf(bp->pdev);
struct bnxt_vf_rep *vf_rep;
int rc, i;
if (bp->eswitch_mode != DEVLINK_ESWITCH_MODE_SWITCHDEV)
return 0;
if (!cfa_code_map)
return -EINVAL;
for (i = 0; i < MAX_CFA_CODE; i++)
cfa_code_map[i] = VF_IDX_INVALID;
for (i = 0; i < num_vfs; i++) {
vf_rep = bp->vf_reps[i];
vf_rep->vf_idx = i;
rc = bnxt_alloc_vf_rep(bp, vf_rep, cfa_code_map);
if (rc)
goto err;
}
return 0;
err:
netdev_info(bp->dev, "%s error=%d\n", __func__, rc);
bnxt_vf_reps_free(bp);
return rc;
}
/* Use the OUI of the PF's perm addr and report the same mac addr
* for the same VF-rep each time
*/
static void bnxt_vf_rep_eth_addr_gen(u8 *src_mac, u16 vf_idx, u8 *mac)
{
u32 addr;
ether_addr_copy(mac, src_mac);
addr = jhash(src_mac, ETH_ALEN, 0) + vf_idx;
mac[3] = (u8)(addr & 0xFF);
mac[4] = (u8)((addr >> 8) & 0xFF);
mac[5] = (u8)((addr >> 16) & 0xFF);
}
static void bnxt_vf_rep_netdev_init(struct bnxt *bp, struct bnxt_vf_rep *vf_rep,
struct net_device *dev)
{
struct net_device *pf_dev = bp->dev;
u16 max_mtu;
SET_NETDEV_DEV(dev, &bp->pdev->dev);
dev->netdev_ops = &bnxt_vf_rep_netdev_ops;
dev->ethtool_ops = &bnxt_vf_rep_ethtool_ops;
/* Just inherit all the featues of the parent PF as the VF-R
* uses the RX/TX rings of the parent PF
*/
dev->hw_features = pf_dev->hw_features;
dev->gso_partial_features = pf_dev->gso_partial_features;
dev->vlan_features = pf_dev->vlan_features;
dev->hw_enc_features = pf_dev->hw_enc_features;
dev->features |= pf_dev->features;
bnxt_vf_rep_eth_addr_gen(bp->pf.mac_addr, vf_rep->vf_idx,
dev->perm_addr);
eth_hw_addr_set(dev, dev->perm_addr);
/* Set VF-Rep's max-mtu to the corresponding VF's max-mtu */
if (!bnxt_hwrm_vfr_qcfg(bp, vf_rep, &max_mtu))
dev->max_mtu = max_mtu;
dev->min_mtu = ETH_ZLEN;
}
int bnxt_vf_reps_create(struct bnxt *bp)
{
u16 *cfa_code_map = NULL, num_vfs = pci_num_vf(bp->pdev);
struct bnxt_vf_rep *vf_rep;
struct net_device *dev;
int rc, i;
if (!(bp->flags & BNXT_FLAG_DSN_VALID))
return -ENODEV;
bp->vf_reps = kcalloc(num_vfs, sizeof(vf_rep), GFP_KERNEL);
if (!bp->vf_reps)
return -ENOMEM;
/* storage for cfa_code to vf-idx mapping */
cfa_code_map = kmalloc_array(MAX_CFA_CODE, sizeof(*bp->cfa_code_map),
GFP_KERNEL);
if (!cfa_code_map) {
rc = -ENOMEM;
goto err;
}
for (i = 0; i < MAX_CFA_CODE; i++)
cfa_code_map[i] = VF_IDX_INVALID;
for (i = 0; i < num_vfs; i++) {
dev = alloc_etherdev(sizeof(*vf_rep));
if (!dev) {
rc = -ENOMEM;
goto err;
}
vf_rep = netdev_priv(dev);
bp->vf_reps[i] = vf_rep;
vf_rep->dev = dev;
vf_rep->bp = bp;
vf_rep->vf_idx = i;
vf_rep->tx_cfa_action = CFA_HANDLE_INVALID;
rc = bnxt_alloc_vf_rep(bp, vf_rep, cfa_code_map);
if (rc)
goto err;
bnxt_vf_rep_netdev_init(bp, vf_rep, dev);
rc = register_netdev(dev);
if (rc) {
/* no need for unregister_netdev in cleanup */
dev->netdev_ops = NULL;
goto err;
}
}
/* publish cfa_code_map only after all VF-reps have been initialized */
bp->cfa_code_map = cfa_code_map;
netif_keep_dst(bp->dev);
return 0;
err:
netdev_info(bp->dev, "%s error=%d\n", __func__, rc);
kfree(cfa_code_map);
__bnxt_vf_reps_destroy(bp);
return rc;
}
/* Devlink related routines */
int bnxt_dl_eswitch_mode_get(struct devlink *devlink, u16 *mode)
{
struct bnxt *bp = bnxt_get_bp_from_dl(devlink);
*mode = bp->eswitch_mode;
return 0;
}
int bnxt_dl_eswitch_mode_set(struct devlink *devlink, u16 mode,
struct netlink_ext_ack *extack)
{
struct bnxt *bp = bnxt_get_bp_from_dl(devlink);
int ret = 0;
if (bp->eswitch_mode == mode) {
netdev_info(bp->dev, "already in %s eswitch mode\n",
mode == DEVLINK_ESWITCH_MODE_LEGACY ?
"legacy" : "switchdev");
return -EINVAL;
}
switch (mode) {
case DEVLINK_ESWITCH_MODE_LEGACY:
bnxt_vf_reps_destroy(bp);
break;
case DEVLINK_ESWITCH_MODE_SWITCHDEV:
if (bp->hwrm_spec_code < 0x10803) {
netdev_warn(bp->dev, "FW does not support SRIOV E-Switch SWITCHDEV mode\n");
return -ENOTSUPP;
}
/* Create representors for existing VFs */
if (pci_num_vf(bp->pdev) > 0)
ret = bnxt_vf_reps_create(bp);
break;
default:
return -EINVAL;
}
if (!ret)
bp->eswitch_mode = mode;
return ret;
}
#endif
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