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 000000000..39c70e625
--- /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");