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/**
* This file is part of the Chelsio T4/T5/T6 Ethernet driver for Linux.
*
* Copyright (C) 2011-2016 Chelsio Communications. 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 as published by
* the Free Software Foundation.
*
* Written and Maintained by:
* Manoj Malviya (manojmalviya@chelsio.com)
* Atul Gupta (atul.gupta@chelsio.com)
* Jitendra Lulla (jlulla@chelsio.com)
* Yeshaswi M R Gowda (yeshaswi@chelsio.com)
* Harsh Jain (harsh@chelsio.com)
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/skbuff.h>
#include <crypto/aes.h>
#include <crypto/hash.h>
#include "t4_msg.h"
#include "chcr_core.h"
#include "cxgb4_uld.h"
static LIST_HEAD(uld_ctx_list);
static DEFINE_MUTEX(dev_mutex);
static atomic_t dev_count;
typedef int (*chcr_handler_func)(struct chcr_dev *dev, unsigned char *input);
static int cpl_fw6_pld_handler(struct chcr_dev *dev, unsigned char *input);
static void *chcr_uld_add(const struct cxgb4_lld_info *lld);
static int chcr_uld_state_change(void *handle, enum cxgb4_state state);
static chcr_handler_func work_handlers[NUM_CPL_CMDS] = {
[CPL_FW6_PLD] = cpl_fw6_pld_handler,
};
static struct cxgb4_uld_info chcr_uld_info = {
.name = DRV_MODULE_NAME,
.nrxq = MAX_ULD_QSETS,
.ntxq = MAX_ULD_QSETS,
.rxq_size = 1024,
.add = chcr_uld_add,
.state_change = chcr_uld_state_change,
.rx_handler = chcr_uld_rx_handler,
};
int assign_chcr_device(struct chcr_dev **dev)
{
struct uld_ctx *u_ctx;
/*
* Which device to use if multiple devices are available TODO
* May be select the device based on round robin. One session
* must go to the same device to maintain the ordering.
*/
mutex_lock(&dev_mutex); /* TODO ? */
u_ctx = list_first_entry(&uld_ctx_list, struct uld_ctx, entry);
if (!u_ctx) {
mutex_unlock(&dev_mutex);
return -ENXIO;
}
*dev = u_ctx->dev;
mutex_unlock(&dev_mutex);
return 0;
}
static int chcr_dev_add(struct uld_ctx *u_ctx)
{
struct chcr_dev *dev;
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (!dev)
return -ENXIO;
spin_lock_init(&dev->lock_chcr_dev);
u_ctx->dev = dev;
dev->u_ctx = u_ctx;
atomic_inc(&dev_count);
return 0;
}
static int chcr_dev_remove(struct uld_ctx *u_ctx)
{
kfree(u_ctx->dev);
u_ctx->dev = NULL;
atomic_dec(&dev_count);
return 0;
}
static int cpl_fw6_pld_handler(struct chcr_dev *dev,
unsigned char *input)
{
struct crypto_async_request *req;
struct cpl_fw6_pld *fw6_pld;
u32 ack_err_status = 0;
int error_status = 0;
fw6_pld = (struct cpl_fw6_pld *)input;
req = (struct crypto_async_request *)(uintptr_t)be64_to_cpu(
fw6_pld->data[1]);
ack_err_status =
ntohl(*(__be32 *)((unsigned char *)&fw6_pld->data[0] + 4));
if (ack_err_status) {
if (CHK_MAC_ERR_BIT(ack_err_status) ||
CHK_PAD_ERR_BIT(ack_err_status))
error_status = -EBADMSG;
}
/* call completion callback with failure status */
if (req) {
error_status = chcr_handle_resp(req, input, error_status);
req->complete(req, error_status);
} else {
pr_err("Incorrect request address from the firmware\n");
return -EFAULT;
}
return 0;
}
int chcr_send_wr(struct sk_buff *skb)
{
return cxgb4_crypto_send(skb->dev, skb);
}
static void *chcr_uld_add(const struct cxgb4_lld_info *lld)
{
struct uld_ctx *u_ctx;
/* Create the device and add it in the device list */
u_ctx = kzalloc(sizeof(*u_ctx), GFP_KERNEL);
if (!u_ctx) {
u_ctx = ERR_PTR(-ENOMEM);
goto out;
}
u_ctx->lldi = *lld;
mutex_lock(&dev_mutex);
list_add_tail(&u_ctx->entry, &uld_ctx_list);
mutex_unlock(&dev_mutex);
out:
return u_ctx;
}
int chcr_uld_rx_handler(void *handle, const __be64 *rsp,
const struct pkt_gl *pgl)
{
struct uld_ctx *u_ctx = (struct uld_ctx *)handle;
struct chcr_dev *dev = u_ctx->dev;
const struct cpl_act_establish *rpl = (struct cpl_act_establish
*)rsp;
if (rpl->ot.opcode != CPL_FW6_PLD) {
pr_err("Unsupported opcode\n");
return 0;
}
if (!pgl)
work_handlers[rpl->ot.opcode](dev, (unsigned char *)&rsp[1]);
else
work_handlers[rpl->ot.opcode](dev, pgl->va);
return 0;
}
static int chcr_uld_state_change(void *handle, enum cxgb4_state state)
{
struct uld_ctx *u_ctx = handle;
int ret = 0;
switch (state) {
case CXGB4_STATE_UP:
if (!u_ctx->dev) {
ret = chcr_dev_add(u_ctx);
if (ret != 0)
return ret;
}
if (atomic_read(&dev_count) == 1)
ret = start_crypto();
break;
case CXGB4_STATE_DETACH:
if (u_ctx->dev) {
mutex_lock(&dev_mutex);
chcr_dev_remove(u_ctx);
mutex_unlock(&dev_mutex);
}
if (!atomic_read(&dev_count))
stop_crypto();
break;
case CXGB4_STATE_START_RECOVERY:
case CXGB4_STATE_DOWN:
default:
break;
}
return ret;
}
static int __init chcr_crypto_init(void)
{
if (cxgb4_register_uld(CXGB4_ULD_CRYPTO, &chcr_uld_info)) {
pr_err("ULD register fail: No chcr crypto support in cxgb4");
return -1;
}
return 0;
}
static void __exit chcr_crypto_exit(void)
{
struct uld_ctx *u_ctx, *tmp;
if (atomic_read(&dev_count))
stop_crypto();
/* Remove all devices from list */
mutex_lock(&dev_mutex);
list_for_each_entry_safe(u_ctx, tmp, &uld_ctx_list, entry) {
if (u_ctx->dev)
chcr_dev_remove(u_ctx);
kfree(u_ctx);
}
mutex_unlock(&dev_mutex);
cxgb4_unregister_uld(CXGB4_ULD_CRYPTO);
}
module_init(chcr_crypto_init);
module_exit(chcr_crypto_exit);
MODULE_DESCRIPTION("Crypto Co-processor for Chelsio Terminator cards.");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Chelsio Communications");
MODULE_VERSION(DRV_VERSION);
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