RDMA/cxgb3: Add driver for Chelsio T3 RNIC

Add an RDMA/iWARP driver for the Chelsio T3 1GbE and 10GbE adapters.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

drivers/infiniband/hw/cxgb3/cxio_resource.c

@@ -0,0 +1,331 @@
+/*
+ * Copyright (c) 2006 Chelsio, Inc. All rights reserved.
+ * Copyright (c) 2006 Open Grid Computing, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      - Redistributions of source code must retain the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer.
+ *
+ *      - Redistributions in binary form must reproduce the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+/* Crude resource management */
+#include <linux/kernel.h>
+#include <linux/random.h>
+#include <linux/slab.h>
+#include <linux/kfifo.h>
+#include <linux/spinlock.h>
+#include <linux/errno.h>
+#include "cxio_resource.h"
+#include "cxio_hal.h"
+
+static struct kfifo *rhdl_fifo;
+static spinlock_t rhdl_fifo_lock;
+
+#define RANDOM_SIZE 16
+
+static int __cxio_init_resource_fifo(struct kfifo **fifo,
+				   spinlock_t *fifo_lock,
+				   u32 nr, u32 skip_low,
+				   u32 skip_high,
+				   int random)
+{
+	u32 i, j, entry = 0, idx;
+	u32 random_bytes;
+	u32 rarray[16];
+	spin_lock_init(fifo_lock);
+
+	*fifo = kfifo_alloc(nr * sizeof(u32), GFP_KERNEL, fifo_lock);
+	if (IS_ERR(*fifo))
+		return -ENOMEM;
+
+	for (i = 0; i < skip_low + skip_high; i++)
+		__kfifo_put(*fifo, (unsigned char *) &entry, sizeof(u32));
+	if (random) {
+		j = 0;
+		random_bytes = random32();
+		for (i = 0; i < RANDOM_SIZE; i++)
+			rarray[i] = i + skip_low;
+		for (i = skip_low + RANDOM_SIZE; i < nr - skip_high; i++) {
+			if (j >= RANDOM_SIZE) {
+				j = 0;
+				random_bytes = random32();
+			}
+			idx = (random_bytes >> (j * 2)) & 0xF;
+			__kfifo_put(*fifo,
+				(unsigned char *) &rarray[idx],
+				sizeof(u32));
+			rarray[idx] = i;
+			j++;
+		}
+		for (i = 0; i < RANDOM_SIZE; i++)
+			__kfifo_put(*fifo,
+				(unsigned char *) &rarray[i],
+				sizeof(u32));
+	} else
+		for (i = skip_low; i < nr - skip_high; i++)
+			__kfifo_put(*fifo, (unsigned char *) &i, sizeof(u32));
+
+	for (i = 0; i < skip_low + skip_high; i++)
+		kfifo_get(*fifo, (unsigned char *) &entry, sizeof(u32));
+	return 0;
+}
+
+static int cxio_init_resource_fifo(struct kfifo **fifo, spinlock_t * fifo_lock,
+				   u32 nr, u32 skip_low, u32 skip_high)
+{
+	return (__cxio_init_resource_fifo(fifo, fifo_lock, nr, skip_low,
+					  skip_high, 0));
+}
+
+static int cxio_init_resource_fifo_random(struct kfifo **fifo,
+				   spinlock_t * fifo_lock,
+				   u32 nr, u32 skip_low, u32 skip_high)
+{
+
+	return (__cxio_init_resource_fifo(fifo, fifo_lock, nr, skip_low,
+					  skip_high, 1));
+}
+
+static int cxio_init_qpid_fifo(struct cxio_rdev *rdev_p)
+{
+	u32 i;
+
+	spin_lock_init(&rdev_p->rscp->qpid_fifo_lock);
+
+	rdev_p->rscp->qpid_fifo = kfifo_alloc(T3_MAX_NUM_QP * sizeof(u32),
+					      GFP_KERNEL,
+					      &rdev_p->rscp->qpid_fifo_lock);
+	if (IS_ERR(rdev_p->rscp->qpid_fifo))
+		return -ENOMEM;
+
+	for (i = 16; i < T3_MAX_NUM_QP; i++)
+		if (!(i & rdev_p->qpmask))
+			__kfifo_put(rdev_p->rscp->qpid_fifo,
+				    (unsigned char *) &i, sizeof(u32));
+	return 0;
+}
+
+int cxio_hal_init_rhdl_resource(u32 nr_rhdl)
+{
+	return cxio_init_resource_fifo(&rhdl_fifo, &rhdl_fifo_lock, nr_rhdl, 1,
+				       0);
+}
+
+void cxio_hal_destroy_rhdl_resource(void)
+{
+	kfifo_free(rhdl_fifo);
+}
+
+/* nr_* must be power of 2 */
+int cxio_hal_init_resource(struct cxio_rdev *rdev_p,
+			   u32 nr_tpt, u32 nr_pbl,
+			   u32 nr_rqt, u32 nr_qpid, u32 nr_cqid, u32 nr_pdid)
+{
+	int err = 0;
+	struct cxio_hal_resource *rscp;
+
+	rscp = kmalloc(sizeof(*rscp), GFP_KERNEL);
+	if (!rscp)
+		return -ENOMEM;
+	rdev_p->rscp = rscp;
+	err = cxio_init_resource_fifo_random(&rscp->tpt_fifo,
+				      &rscp->tpt_fifo_lock,
+				      nr_tpt, 1, 0);
+	if (err)
+		goto tpt_err;
+	err = cxio_init_qpid_fifo(rdev_p);
+	if (err)
+		goto qpid_err;
+	err = cxio_init_resource_fifo(&rscp->cqid_fifo, &rscp->cqid_fifo_lock,
+				      nr_cqid, 1, 0);
+	if (err)
+		goto cqid_err;
+	err = cxio_init_resource_fifo(&rscp->pdid_fifo, &rscp->pdid_fifo_lock,
+				      nr_pdid, 1, 0);
+	if (err)
+		goto pdid_err;
+	return 0;
+pdid_err:
+	kfifo_free(rscp->cqid_fifo);
+cqid_err:
+	kfifo_free(rscp->qpid_fifo);
+qpid_err:
+	kfifo_free(rscp->tpt_fifo);
+tpt_err:
+	return -ENOMEM;
+}
+
+/*
+ * returns 0 if no resource available
+ */
+static inline u32 cxio_hal_get_resource(struct kfifo *fifo)
+{
+	u32 entry;
+	if (kfifo_get(fifo, (unsigned char *) &entry, sizeof(u32)))
+		return entry;
+	else
+		return 0;	/* fifo emptry */
+}
+
+static inline void cxio_hal_put_resource(struct kfifo *fifo, u32 entry)
+{
+	BUG_ON(kfifo_put(fifo, (unsigned char *) &entry, sizeof(u32)) == 0);
+}
+
+u32 cxio_hal_get_rhdl(void)
+{
+	return cxio_hal_get_resource(rhdl_fifo);
+}
+
+void cxio_hal_put_rhdl(u32 rhdl)
+{
+	cxio_hal_put_resource(rhdl_fifo, rhdl);
+}
+
+u32 cxio_hal_get_stag(struct cxio_hal_resource *rscp)
+{
+	return cxio_hal_get_resource(rscp->tpt_fifo);
+}
+
+void cxio_hal_put_stag(struct cxio_hal_resource *rscp, u32 stag)
+{
+	cxio_hal_put_resource(rscp->tpt_fifo, stag);
+}
+
+u32 cxio_hal_get_qpid(struct cxio_hal_resource *rscp)
+{
+	u32 qpid = cxio_hal_get_resource(rscp->qpid_fifo);
+	PDBG("%s qpid 0x%x\n", __FUNCTION__, qpid);
+	return qpid;
+}
+
+void cxio_hal_put_qpid(struct cxio_hal_resource *rscp, u32 qpid)
+{
+	PDBG("%s qpid 0x%x\n", __FUNCTION__, qpid);
+	cxio_hal_put_resource(rscp->qpid_fifo, qpid);
+}
+
+u32 cxio_hal_get_cqid(struct cxio_hal_resource *rscp)
+{
+	return cxio_hal_get_resource(rscp->cqid_fifo);
+}
+
+void cxio_hal_put_cqid(struct cxio_hal_resource *rscp, u32 cqid)
+{
+	cxio_hal_put_resource(rscp->cqid_fifo, cqid);
+}
+
+u32 cxio_hal_get_pdid(struct cxio_hal_resource *rscp)
+{
+	return cxio_hal_get_resource(rscp->pdid_fifo);
+}
+
+void cxio_hal_put_pdid(struct cxio_hal_resource *rscp, u32 pdid)
+{
+	cxio_hal_put_resource(rscp->pdid_fifo, pdid);
+}
+
+void cxio_hal_destroy_resource(struct cxio_hal_resource *rscp)
+{
+	kfifo_free(rscp->tpt_fifo);
+	kfifo_free(rscp->cqid_fifo);
+	kfifo_free(rscp->qpid_fifo);
+	kfifo_free(rscp->pdid_fifo);
+	kfree(rscp);
+}
+
+/*
+ * PBL Memory Manager.  Uses Linux generic allocator.
+ */
+
+#define MIN_PBL_SHIFT 8			/* 256B == min PBL size (32 entries) */
+#define PBL_CHUNK 2*1024*1024
+
+u32 cxio_hal_pblpool_alloc(struct cxio_rdev *rdev_p, int size)
+{
+	unsigned long addr = gen_pool_alloc(rdev_p->pbl_pool, size);
+	PDBG("%s addr 0x%x size %d\n", __FUNCTION__, (u32)addr, size);
+	return (u32)addr;
+}
+
+void cxio_hal_pblpool_free(struct cxio_rdev *rdev_p, u32 addr, int size)
+{
+	PDBG("%s addr 0x%x size %d\n", __FUNCTION__, addr, size);
+	gen_pool_free(rdev_p->pbl_pool, (unsigned long)addr, size);
+}
+
+int cxio_hal_pblpool_create(struct cxio_rdev *rdev_p)
+{
+	unsigned long i;
+	rdev_p->pbl_pool = gen_pool_create(MIN_PBL_SHIFT, -1);
+	if (rdev_p->pbl_pool)
+		for (i = rdev_p->rnic_info.pbl_base;
+		     i <= rdev_p->rnic_info.pbl_top - PBL_CHUNK + 1;
+		     i += PBL_CHUNK)
+			gen_pool_add(rdev_p->pbl_pool, i, PBL_CHUNK, -1);
+	return rdev_p->pbl_pool ? 0 : -ENOMEM;
+}
+
+void cxio_hal_pblpool_destroy(struct cxio_rdev *rdev_p)
+{
+	gen_pool_destroy(rdev_p->pbl_pool);
+}
+
+/*
+ * RQT Memory Manager.  Uses Linux generic allocator.
+ */
+
+#define MIN_RQT_SHIFT 10	/* 1KB == mini RQT size (16 entries) */
+#define RQT_CHUNK 2*1024*1024
+
+u32 cxio_hal_rqtpool_alloc(struct cxio_rdev *rdev_p, int size)
+{
+	unsigned long addr = gen_pool_alloc(rdev_p->rqt_pool, size << 6);
+	PDBG("%s addr 0x%x size %d\n", __FUNCTION__, (u32)addr, size << 6);
+	return (u32)addr;
+}
+
+void cxio_hal_rqtpool_free(struct cxio_rdev *rdev_p, u32 addr, int size)
+{
+	PDBG("%s addr 0x%x size %d\n", __FUNCTION__, addr, size << 6);
+	gen_pool_free(rdev_p->rqt_pool, (unsigned long)addr, size << 6);
+}
+
+int cxio_hal_rqtpool_create(struct cxio_rdev *rdev_p)
+{
+	unsigned long i;
+	rdev_p->rqt_pool = gen_pool_create(MIN_RQT_SHIFT, -1);
+	if (rdev_p->rqt_pool)
+		for (i = rdev_p->rnic_info.rqt_base;
+		     i <= rdev_p->rnic_info.rqt_top - RQT_CHUNK + 1;
+		     i += RQT_CHUNK)
+			gen_pool_add(rdev_p->rqt_pool, i, RQT_CHUNK, -1);
+	return rdev_p->rqt_pool ? 0 : -ENOMEM;
+}
+
+void cxio_hal_rqtpool_destroy(struct cxio_rdev *rdev_p)
+{
+	gen_pool_destroy(rdev_p->rqt_pool);
+}