diff options
Diffstat (limited to 'drivers/crypto/chelsio/chcr_core.c')
-rw-r--r-- | drivers/crypto/chelsio/chcr_core.c | 311 |
1 files changed, 311 insertions, 0 deletions
diff --git a/drivers/crypto/chelsio/chcr_core.c b/drivers/crypto/chelsio/chcr_core.c new file mode 100644 index 0000000000..39c70e6255 --- /dev/null +++ b/drivers/crypto/chelsio/chcr_core.c @@ -0,0 +1,311 @@ +/* + * 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 struct chcr_driver_data drv_data; + +typedef int (*chcr_handler_func)(struct adapter *adap, unsigned char *input); +static int cpl_fw6_pld_handler(struct adapter *adap, 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, + /* Max ntxq will be derived from fw config file*/ + .rxq_size = 1024, + .add = chcr_uld_add, + .state_change = chcr_uld_state_change, + .rx_handler = chcr_uld_rx_handler, +}; + +static void detach_work_fn(struct work_struct *work) +{ + struct chcr_dev *dev; + + dev = container_of(work, struct chcr_dev, detach_work.work); + + if (atomic_read(&dev->inflight)) { + dev->wqretry--; + if (dev->wqretry) { + pr_debug("Request Inflight Count %d\n", + atomic_read(&dev->inflight)); + + schedule_delayed_work(&dev->detach_work, WQ_DETACH_TM); + } else { + WARN(1, "CHCR:%d request Still Pending\n", + atomic_read(&dev->inflight)); + complete(&dev->detach_comp); + } + } else { + complete(&dev->detach_comp); + } +} + +struct uld_ctx *assign_chcr_device(void) +{ + struct uld_ctx *u_ctx = NULL; + + /* + * When multiple devices are present in system select + * device in round-robin fashion for crypto operations + * Although One session must use the same device to + * maintain request-response ordering. + */ + mutex_lock(&drv_data.drv_mutex); + if (!list_empty(&drv_data.act_dev)) { + u_ctx = drv_data.last_dev; + if (list_is_last(&drv_data.last_dev->entry, &drv_data.act_dev)) + drv_data.last_dev = list_first_entry(&drv_data.act_dev, + struct uld_ctx, entry); + else + drv_data.last_dev = + list_next_entry(drv_data.last_dev, entry); + } + mutex_unlock(&drv_data.drv_mutex); + return u_ctx; +} + +static void chcr_dev_add(struct uld_ctx *u_ctx) +{ + struct chcr_dev *dev; + + dev = &u_ctx->dev; + dev->state = CHCR_ATTACH; + atomic_set(&dev->inflight, 0); + mutex_lock(&drv_data.drv_mutex); + list_move(&u_ctx->entry, &drv_data.act_dev); + if (!drv_data.last_dev) + drv_data.last_dev = u_ctx; + mutex_unlock(&drv_data.drv_mutex); +} + +static void chcr_dev_init(struct uld_ctx *u_ctx) +{ + struct chcr_dev *dev; + + dev = &u_ctx->dev; + spin_lock_init(&dev->lock_chcr_dev); + INIT_DELAYED_WORK(&dev->detach_work, detach_work_fn); + init_completion(&dev->detach_comp); + dev->state = CHCR_INIT; + dev->wqretry = WQ_RETRY; + atomic_inc(&drv_data.dev_count); + atomic_set(&dev->inflight, 0); + mutex_lock(&drv_data.drv_mutex); + list_add_tail(&u_ctx->entry, &drv_data.inact_dev); + mutex_unlock(&drv_data.drv_mutex); +} + +static int chcr_dev_move(struct uld_ctx *u_ctx) +{ + mutex_lock(&drv_data.drv_mutex); + if (drv_data.last_dev == u_ctx) { + if (list_is_last(&drv_data.last_dev->entry, &drv_data.act_dev)) + drv_data.last_dev = list_first_entry(&drv_data.act_dev, + struct uld_ctx, entry); + else + drv_data.last_dev = + list_next_entry(drv_data.last_dev, entry); + } + list_move(&u_ctx->entry, &drv_data.inact_dev); + if (list_empty(&drv_data.act_dev)) + drv_data.last_dev = NULL; + atomic_dec(&drv_data.dev_count); + mutex_unlock(&drv_data.drv_mutex); + + return 0; +} + +static int cpl_fw6_pld_handler(struct adapter *adap, + 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 (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); + } else { + pr_err("Incorrect request address from the firmware\n"); + return -EFAULT; + } + if (error_status) + atomic_inc(&adap->chcr_stats.error); + + 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 */ + pr_info_once("%s\n", DRV_DESC); + if (!(lld->ulp_crypto & ULP_CRYPTO_LOOKASIDE)) + return ERR_PTR(-EOPNOTSUPP); + + /* 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; + chcr_dev_init(u_ctx); +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; + struct adapter *adap = padap(dev); + const struct cpl_fw6_pld *rpl = (struct cpl_fw6_pld *)rsp; + + if (!work_handlers[rpl->opcode]) { + pr_err("Unsupported opcode %d received\n", rpl->opcode); + return 0; + } + + if (!pgl) + work_handlers[rpl->opcode](adap, (unsigned char *)&rsp[1]); + else + work_handlers[rpl->opcode](adap, pgl->va); + return 0; +} + +static void chcr_detach_device(struct uld_ctx *u_ctx) +{ + struct chcr_dev *dev = &u_ctx->dev; + + if (dev->state == CHCR_DETACH) { + pr_debug("Detached Event received for already detach device\n"); + return; + } + dev->state = CHCR_DETACH; + if (atomic_read(&dev->inflight) != 0) { + schedule_delayed_work(&dev->detach_work, WQ_DETACH_TM); + wait_for_completion(&dev->detach_comp); + } + + // Move u_ctx to inactive_dev list + chcr_dev_move(u_ctx); +} + +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.state != CHCR_INIT) { + // ALready Initialised. + return 0; + } + chcr_dev_add(u_ctx); + ret = start_crypto(); + break; + + case CXGB4_STATE_DETACH: + chcr_detach_device(u_ctx); + if (!atomic_read(&drv_data.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) +{ + INIT_LIST_HEAD(&drv_data.act_dev); + INIT_LIST_HEAD(&drv_data.inact_dev); + atomic_set(&drv_data.dev_count, 0); + mutex_init(&drv_data.drv_mutex); + drv_data.last_dev = NULL; + cxgb4_register_uld(CXGB4_ULD_CRYPTO, &chcr_uld_info); + + return 0; +} + +static void __exit chcr_crypto_exit(void) +{ + struct uld_ctx *u_ctx, *tmp; + struct adapter *adap; + + stop_crypto(); + cxgb4_unregister_uld(CXGB4_ULD_CRYPTO); + /* Remove all devices from list */ + mutex_lock(&drv_data.drv_mutex); + list_for_each_entry_safe(u_ctx, tmp, &drv_data.act_dev, entry) { + adap = padap(&u_ctx->dev); + memset(&adap->chcr_stats, 0, sizeof(adap->chcr_stats)); + list_del(&u_ctx->entry); + kfree(u_ctx); + } + list_for_each_entry_safe(u_ctx, tmp, &drv_data.inact_dev, entry) { + adap = padap(&u_ctx->dev); + memset(&adap->chcr_stats, 0, sizeof(adap->chcr_stats)); + list_del(&u_ctx->entry); + kfree(u_ctx); + } + mutex_unlock(&drv_data.drv_mutex); +} + +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"); |