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/* 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 "bnxt_hsi.h"
#include "bnxt.h"
#include "bnxt_vfr.h"
#define CFA_HANDLE_INVALID 0xffff
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) {
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;
}
bp->eswitch_mode = DEVLINK_ESWITCH_MODE_LEGACY;
if (closed)
bnxt_open_nic(bp, false, false);
rtnl_unlock();
/* Need to call vf_reps_destroy() outside of rntl_lock
* as unregister_netdev takes rtnl_lock
*/
__bnxt_vf_reps_destroy(bp);
}
/* 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;
/* 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);
ether_addr_copy(dev->dev_addr, dev->perm_addr);
}
static int bnxt_vf_reps_create(struct bnxt *bp)
{
u16 num_vfs = pci_num_vf(bp->pdev);
struct bnxt_vf_rep *vf_rep;
struct net_device *dev;
int rc, i;
bp->vf_reps = kcalloc(num_vfs, sizeof(vf_rep), GFP_KERNEL);
if (!bp->vf_reps)
return -ENOMEM;
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;
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;
}
}
bp->eswitch_mode = DEVLINK_ESWITCH_MODE_SWITCHDEV;
return 0;
err:
netdev_info(bp->dev, "%s error=%d", __func__, rc);
__bnxt_vf_reps_destroy(bp);
return rc;
}
/* Devlink related routines */
static 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;
}
static int bnxt_dl_eswitch_mode_set(struct devlink *devlink, u16 mode)
{
struct bnxt *bp = bnxt_get_bp_from_dl(devlink);
int rc = 0;
mutex_lock(&bp->sriov_lock);
if (bp->eswitch_mode == mode) {
netdev_info(bp->dev, "already in %s eswitch mode",
mode == DEVLINK_ESWITCH_MODE_LEGACY ?
"legacy" : "switchdev");
rc = -EINVAL;
goto done;
}
switch (mode) {
case DEVLINK_ESWITCH_MODE_LEGACY:
bnxt_vf_reps_destroy(bp);
break;
case DEVLINK_ESWITCH_MODE_SWITCHDEV:
if (pci_num_vf(bp->pdev) == 0) {
netdev_info(bp->dev,
"Enable VFs before setting swtichdev mode");
rc = -EPERM;
goto done;
}
rc = bnxt_vf_reps_create(bp);
break;
default:
rc = -EINVAL;
goto done;
}
done:
mutex_unlock(&bp->sriov_lock);
return rc;
}
static const struct devlink_ops bnxt_dl_ops = {
.eswitch_mode_set = bnxt_dl_eswitch_mode_set,
.eswitch_mode_get = bnxt_dl_eswitch_mode_get
};
int bnxt_dl_register(struct bnxt *bp)
{
struct devlink *dl;
int rc;
if (!pci_find_ext_capability(bp->pdev, PCI_EXT_CAP_ID_SRIOV))
return 0;
if (bp->hwrm_spec_code < 0x10800) {
netdev_warn(bp->dev, "Firmware does not support SR-IOV E-Switch SWITCHDEV mode.\n");
return -ENOTSUPP;
}
dl = devlink_alloc(&bnxt_dl_ops, sizeof(struct bnxt_dl));
if (!dl) {
netdev_warn(bp->dev, "devlink_alloc failed");
return -ENOMEM;
}
bnxt_link_bp_to_dl(dl, bp);
bp->eswitch_mode = DEVLINK_ESWITCH_MODE_LEGACY;
rc = devlink_register(dl, &bp->pdev->dev);
if (rc) {
bnxt_link_bp_to_dl(dl, NULL);
devlink_free(dl);
netdev_warn(bp->dev, "devlink_register failed. rc=%d", rc);
return rc;
}
return 0;
}
void bnxt_dl_unregister(struct bnxt *bp)
{
struct devlink *dl = bp->dl;
if (!dl)
return;
devlink_unregister(dl);
devlink_free(dl);
}
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