[SCSI] fnic: Add new Cisco PCI-Express FCoE HBA

fnic is a driver for the Cisco PCI-Express FCoE HBA

Signed-off-by: Abhijeet Joglekar <abjoglek@cisco.com>
Signed-off-by: Joe Eykholt <jeykholt@cisco.com>
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

1 files changed, 690 insertions, 0 deletions

diff --git a/drivers/scsi/fnic/vnic_dev.c b/drivers/scsi/fnic/vnic_dev.c
new file mode 100644
index 000000000000..566770645086
--- /dev/null
+++ b/drivers/scsi/fnic/vnic_dev.c
@@ -0,0 +1,690 @@
+/*
+ * Copyright 2008 Cisco Systems, Inc.  All rights reserved.
+ * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
+ *
+ * This program is free software; you may redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/pci.h>
+#include <linux/delay.h>
+#include <linux/if_ether.h>
+#include "vnic_resource.h"
+#include "vnic_devcmd.h"
+#include "vnic_dev.h"
+#include "vnic_stats.h"
+
+struct vnic_res {
+        void __iomem *vaddr;
+        unsigned int count;
+};
+
+struct vnic_dev {
+        void *priv;
+        struct pci_dev *pdev;
+        struct vnic_res res[RES_TYPE_MAX];
+        enum vnic_dev_intr_mode intr_mode;
+        struct vnic_devcmd __iomem *devcmd;
+        struct vnic_devcmd_notify *notify;
+        struct vnic_devcmd_notify notify_copy;
+        dma_addr_t notify_pa;
+        u32 *linkstatus;
+        dma_addr_t linkstatus_pa;
+        struct vnic_stats *stats;
+        dma_addr_t stats_pa;
+        struct vnic_devcmd_fw_info *fw_info;
+        dma_addr_t fw_info_pa;
+};
+
+#define VNIC_MAX_RES_HDR_SIZE \
+        (sizeof(struct vnic_resource_header) + \
+        sizeof(struct vnic_resource) * RES_TYPE_MAX)
+#define VNIC_RES_STRIDE 128
+
+void *vnic_dev_priv(struct vnic_dev *vdev)
+{
+        return vdev->priv;
+}
+
+static int vnic_dev_discover_res(struct vnic_dev *vdev,
+        struct vnic_dev_bar *bar)
+{
+        struct vnic_resource_header __iomem *rh;
+        struct vnic_resource __iomem *r;
+        u8 type;
+
+        if (bar->len < VNIC_MAX_RES_HDR_SIZE) {
+                printk(KERN_ERR "vNIC BAR0 res hdr length error\n");
+                return -EINVAL;
+        }
+
+        rh = bar->vaddr;
+        if (!rh) {
+                printk(KERN_ERR "vNIC BAR0 res hdr not mem-mapped\n");
+                return -EINVAL;
+        }
+
+        if (ioread32(&rh->magic) != VNIC_RES_MAGIC ||
+            ioread32(&rh->version) != VNIC_RES_VERSION) {
+                printk(KERN_ERR "vNIC BAR0 res magic/version error "
+                        "exp (%lx/%lx) curr (%x/%x)\n",
+                        VNIC_RES_MAGIC, VNIC_RES_VERSION,
+                        ioread32(&rh->magic), ioread32(&rh->version));
+                return -EINVAL;
+        }
+
+        r = (struct vnic_resource __iomem *)(rh + 1);
+
+        while ((type = ioread8(&r->type)) != RES_TYPE_EOL) {
+
+                u8 bar_num = ioread8(&r->bar);
+                u32 bar_offset = ioread32(&r->bar_offset);
+                u32 count = ioread32(&r->count);
+                u32 len;
+
+                r++;
+
+                if (bar_num != 0)  /* only mapping in BAR0 resources */
+                        continue;
+
+                switch (type) {
+                case RES_TYPE_WQ:
+                case RES_TYPE_RQ:
+                case RES_TYPE_CQ:
+                case RES_TYPE_INTR_CTRL:
+                        /* each count is stride bytes long */
+                        len = count * VNIC_RES_STRIDE;
+                        if (len + bar_offset > bar->len) {
+                                printk(KERN_ERR "vNIC BAR0 resource %d "
+                                        "out-of-bounds, offset 0x%x + "
+                                        "size 0x%x > bar len 0x%lx\n",
+                                        type, bar_offset,
+                                        len,
+                                        bar->len);
+                                return -EINVAL;
+                        }
+                        break;
+                case RES_TYPE_INTR_PBA_LEGACY:
+                case RES_TYPE_DEVCMD:
+                        len = count;
+                        break;
+                default:
+                        continue;
+                }
+
+                vdev->res[type].count = count;
+                vdev->res[type].vaddr = (char __iomem *)bar->vaddr + bar_offset;
+        }
+
+        return 0;
+}
+
+unsigned int vnic_dev_get_res_count(struct vnic_dev *vdev,
+        enum vnic_res_type type)
+{
+        return vdev->res[type].count;
+}
+
+void __iomem *vnic_dev_get_res(struct vnic_dev *vdev, enum vnic_res_type type,
+        unsigned int index)
+{
+        if (!vdev->res[type].vaddr)
+                return NULL;
+
+        switch (type) {
+        case RES_TYPE_WQ:
+        case RES_TYPE_RQ:
+        case RES_TYPE_CQ:
+        case RES_TYPE_INTR_CTRL:
+                return (char __iomem *)vdev->res[type].vaddr +
+                                        index * VNIC_RES_STRIDE;
+        default:
+                return (char __iomem *)vdev->res[type].vaddr;
+        }
+}
+
+unsigned int vnic_dev_desc_ring_size(struct vnic_dev_ring *ring,
+                                     unsigned int desc_count,
+                                     unsigned int desc_size)
+{
+        /* The base address of the desc rings must be 512 byte aligned.
+         * Descriptor count is aligned to groups of 32 descriptors.  A
+         * count of 0 means the maximum 4096 descriptors.  Descriptor
+         * size is aligned to 16 bytes.
+         */
+
+        unsigned int count_align = 32;
+        unsigned int desc_align = 16;
+
+        ring->base_align = 512;
+
+        if (desc_count == 0)
+                desc_count = 4096;
+
+        ring->desc_count = ALIGN(desc_count, count_align);
+
+        ring->desc_size = ALIGN(desc_size, desc_align);
+
+        ring->size = ring->desc_count * ring->desc_size;
+        ring->size_unaligned = ring->size + ring->base_align;
+
+        return ring->size_unaligned;
+}
+
+void vnic_dev_clear_desc_ring(struct vnic_dev_ring *ring)
+{
+        memset(ring->descs, 0, ring->size);
+}
+
+int vnic_dev_alloc_desc_ring(struct vnic_dev *vdev, struct vnic_dev_ring *ring,
+        unsigned int desc_count, unsigned int desc_size)
+{
+        vnic_dev_desc_ring_size(ring, desc_count, desc_size);
+
+        ring->descs_unaligned = pci_alloc_consistent(vdev->pdev,
+                ring->size_unaligned,
+                &ring->base_addr_unaligned);
+
+        if (!ring->descs_unaligned) {
+                printk(KERN_ERR
+                  "Failed to allocate ring (size=%d), aborting\n",
+                        (int)ring->size);
+                return -ENOMEM;
+        }
+
+        ring->base_addr = ALIGN(ring->base_addr_unaligned,
+                ring->base_align);
+        ring->descs = (u8 *)ring->descs_unaligned +
+                (ring->base_addr - ring->base_addr_unaligned);
+
+        vnic_dev_clear_desc_ring(ring);
+
+        ring->desc_avail = ring->desc_count - 1;
+
+        return 0;
+}
+
+void vnic_dev_free_desc_ring(struct vnic_dev *vdev, struct vnic_dev_ring *ring)
+{
+        if (ring->descs) {
+                pci_free_consistent(vdev->pdev,
+                        ring->size_unaligned,
+                        ring->descs_unaligned,
+                        ring->base_addr_unaligned);
+                ring->descs = NULL;
+        }
+}
+
+int vnic_dev_cmd(struct vnic_dev *vdev, enum vnic_devcmd_cmd cmd,
+        u64 *a0, u64 *a1, int wait)
+{
+        struct vnic_devcmd __iomem *devcmd = vdev->devcmd;
+        int delay;
+        u32 status;
+        int dev_cmd_err[] = {
+                /* convert from fw's version of error.h to host's version */
+                0,      /* ERR_SUCCESS */
+                EINVAL, /* ERR_EINVAL */
+                EFAULT, /* ERR_EFAULT */
+                EPERM,  /* ERR_EPERM */
+                EBUSY,  /* ERR_EBUSY */
+        };
+        int err;
+
+        status = ioread32(&devcmd->status);
+        if (status & STAT_BUSY) {
+                printk(KERN_ERR "Busy devcmd %d\n", _CMD_N(cmd));
+                return -EBUSY;
+        }
+
+        if (_CMD_DIR(cmd) & _CMD_DIR_WRITE) {
+                writeq(*a0, &devcmd->args[0]);
+                writeq(*a1, &devcmd->args[1]);
+                wmb();
+        }
+
+        iowrite32(cmd, &devcmd->cmd);
+
+        if ((_CMD_FLAGS(cmd) & _CMD_FLAGS_NOWAIT))
+                        return 0;
+
+        for (delay = 0; delay < wait; delay++) {
+
+                udelay(100);
+
+                status = ioread32(&devcmd->status);
+                if (!(status & STAT_BUSY)) {
+
+                        if (status & STAT_ERROR) {
+                                err = dev_cmd_err[(int)readq(&devcmd->args[0])];
+                                printk(KERN_ERR "Error %d devcmd %d\n",
+                                        err, _CMD_N(cmd));
+                                return -err;
+                        }
+
+                        if (_CMD_DIR(cmd) & _CMD_DIR_READ) {
+                                rmb();
+                                *a0 = readq(&devcmd->args[0]);
+                                *a1 = readq(&devcmd->args[1]);
+                        }
+
+                        return 0;
+                }
+        }
+
+        printk(KERN_ERR "Timedout devcmd %d\n", _CMD_N(cmd));
+        return -ETIMEDOUT;
+}
+
+int vnic_dev_fw_info(struct vnic_dev *vdev,
+        struct vnic_devcmd_fw_info **fw_info)
+{
+        u64 a0, a1 = 0;
+        int wait = 1000;
+        int err = 0;
+
+        if (!vdev->fw_info) {
+                vdev->fw_info = pci_alloc_consistent(vdev->pdev,
+                        sizeof(struct vnic_devcmd_fw_info),
+                        &vdev->fw_info_pa);
+                if (!vdev->fw_info)
+                        return -ENOMEM;
+
+                a0 = vdev->fw_info_pa;
+
+                /* only get fw_info once and cache it */
+                err = vnic_dev_cmd(vdev, CMD_MCPU_FW_INFO, &a0, &a1, wait);
+        }
+
+        *fw_info = vdev->fw_info;
+
+        return err;
+}
+
+int vnic_dev_spec(struct vnic_dev *vdev, unsigned int offset, unsigned int size,
+        void *value)
+{
+        u64 a0, a1;
+        int wait = 1000;
+        int err;
+
+        a0 = offset;
+        a1 = size;
+
+        err = vnic_dev_cmd(vdev, CMD_DEV_SPEC, &a0, &a1, wait);
+
+        switch (size) {
+        case 1:
+                *(u8 *)value = (u8)a0;
+                break;
+        case 2:
+                *(u16 *)value = (u16)a0;
+                break;
+        case 4:
+                *(u32 *)value = (u32)a0;
+                break;
+        case 8:
+                *(u64 *)value = a0;
+                break;
+        default:
+                BUG();
+                break;
+        }
+
+        return err;
+}
+
+int vnic_dev_stats_clear(struct vnic_dev *vdev)
+{
+        u64 a0 = 0, a1 = 0;
+        int wait = 1000;
+        return vnic_dev_cmd(vdev, CMD_STATS_CLEAR, &a0, &a1, wait);
+}
+
+int vnic_dev_stats_dump(struct vnic_dev *vdev, struct vnic_stats **stats)
+{
+        u64 a0, a1;
+        int wait = 1000;
+
+        if (!vdev->stats) {
+                vdev->stats = pci_alloc_consistent(vdev->pdev,
+                        sizeof(struct vnic_stats), &vdev->stats_pa);
+                if (!vdev->stats)
+                        return -ENOMEM;
+        }
+
+        *stats = vdev->stats;
+        a0 = vdev->stats_pa;
+        a1 = sizeof(struct vnic_stats);
+
+        return vnic_dev_cmd(vdev, CMD_STATS_DUMP, &a0, &a1, wait);
+}
+
+int vnic_dev_close(struct vnic_dev *vdev)
+{
+        u64 a0 = 0, a1 = 0;
+        int wait = 1000;
+        return vnic_dev_cmd(vdev, CMD_CLOSE, &a0, &a1, wait);
+}
+
+int vnic_dev_enable(struct vnic_dev *vdev)
+{
+        u64 a0 = 0, a1 = 0;
+        int wait = 1000;
+        return vnic_dev_cmd(vdev, CMD_ENABLE, &a0, &a1, wait);
+}
+
+int vnic_dev_disable(struct vnic_dev *vdev)
+{
+        u64 a0 = 0, a1 = 0;
+        int wait = 1000;
+        return vnic_dev_cmd(vdev, CMD_DISABLE, &a0, &a1, wait);
+}
+
+int vnic_dev_open(struct vnic_dev *vdev, int arg)
+{
+        u64 a0 = (u32)arg, a1 = 0;
+        int wait = 1000;
+        return vnic_dev_cmd(vdev, CMD_OPEN, &a0, &a1, wait);
+}
+
+int vnic_dev_open_done(struct vnic_dev *vdev, int *done)
+{
+        u64 a0 = 0, a1 = 0;
+        int wait = 1000;
+        int err;
+
+        *done = 0;
+
+        err = vnic_dev_cmd(vdev, CMD_OPEN_STATUS, &a0, &a1, wait);
+        if (err)
+                return err;
+
+        *done = (a0 == 0);
+
+        return 0;
+}
+
+int vnic_dev_soft_reset(struct vnic_dev *vdev, int arg)
+{
+        u64 a0 = (u32)arg, a1 = 0;
+        int wait = 1000;
+        return vnic_dev_cmd(vdev, CMD_SOFT_RESET, &a0, &a1, wait);
+}
+
+int vnic_dev_soft_reset_done(struct vnic_dev *vdev, int *done)
+{
+        u64 a0 = 0, a1 = 0;
+        int wait = 1000;
+        int err;
+
+        *done = 0;
+
+        err = vnic_dev_cmd(vdev, CMD_SOFT_RESET_STATUS, &a0, &a1, wait);
+        if (err)
+                return err;
+
+        *done = (a0 == 0);
+
+        return 0;
+}
+
+int vnic_dev_hang_notify(struct vnic_dev *vdev)
+{
+        u64 a0, a1;
+        int wait = 1000;
+        return vnic_dev_cmd(vdev, CMD_HANG_NOTIFY, &a0, &a1, wait);
+}
+
+int vnic_dev_mac_addr(struct vnic_dev *vdev, u8 *mac_addr)
+{
+        u64 a0, a1;
+        int wait = 1000;
+        int err, i;
+
+        for (i = 0; i < ETH_ALEN; i++)
+                mac_addr[i] = 0;
+
+        err = vnic_dev_cmd(vdev, CMD_MAC_ADDR, &a0, &a1, wait);
+        if (err)
+                return err;
+
+        for (i = 0; i < ETH_ALEN; i++)
+                mac_addr[i] = ((u8 *)&a0)[i];
+
+        return 0;
+}
+
+void vnic_dev_packet_filter(struct vnic_dev *vdev, int directed, int multicast,
+        int broadcast, int promisc, int allmulti)
+{
+        u64 a0, a1 = 0;
+        int wait = 1000;
+        int err;
+
+        a0 = (directed ? CMD_PFILTER_DIRECTED : 0) |
+             (multicast ? CMD_PFILTER_MULTICAST : 0) |
+             (broadcast ? CMD_PFILTER_BROADCAST : 0) |
+             (promisc ? CMD_PFILTER_PROMISCUOUS : 0) |
+             (allmulti ? CMD_PFILTER_ALL_MULTICAST : 0);
+
+        err = vnic_dev_cmd(vdev, CMD_PACKET_FILTER, &a0, &a1, wait);
+        if (err)
+                printk(KERN_ERR "Can't set packet filter\n");
+}
+
+void vnic_dev_add_addr(struct vnic_dev *vdev, u8 *addr)
+{
+        u64 a0 = 0, a1 = 0;
+        int wait = 1000;
+        int err;
+        int i;
+
+        for (i = 0; i < ETH_ALEN; i++)
+                ((u8 *)&a0)[i] = addr[i];
+
+        err = vnic_dev_cmd(vdev, CMD_ADDR_ADD, &a0, &a1, wait);
+        if (err)
+                printk(KERN_ERR
+                        "Can't add addr [%02x:%02x:%02x:%02x:%02x:%02x], %d\n",
+                        addr[0], addr[1], addr[2], addr[3], addr[4], addr[5],
+                        err);
+}
+
+void vnic_dev_del_addr(struct vnic_dev *vdev, u8 *addr)
+{
+        u64 a0 = 0, a1 = 0;
+        int wait = 1000;
+        int err;
+        int i;
+
+        for (i = 0; i < ETH_ALEN; i++)
+                ((u8 *)&a0)[i] = addr[i];
+
+        err = vnic_dev_cmd(vdev, CMD_ADDR_DEL, &a0, &a1, wait);
+        if (err)
+                printk(KERN_ERR
+                        "Can't del addr [%02x:%02x:%02x:%02x:%02x:%02x], %d\n",
+                        addr[0], addr[1], addr[2], addr[3], addr[4], addr[5],
+                        err);
+}
+
+int vnic_dev_notify_set(struct vnic_dev *vdev, u16 intr)
+{
+        u64 a0, a1;
+        int wait = 1000;
+
+        if (!vdev->notify) {
+                vdev->notify = pci_alloc_consistent(vdev->pdev,
+                        sizeof(struct vnic_devcmd_notify),
+                        &vdev->notify_pa);
+                if (!vdev->notify)
+                        return -ENOMEM;
+        }
+
+        a0 = vdev->notify_pa;
+        a1 = ((u64)intr << 32) & 0x0000ffff00000000ULL;
+        a1 += sizeof(struct vnic_devcmd_notify);
+
+        return vnic_dev_cmd(vdev, CMD_NOTIFY, &a0, &a1, wait);
+}
+
+void vnic_dev_notify_unset(struct vnic_dev *vdev)
+{
+        u64 a0, a1;
+        int wait = 1000;
+
+        a0 = 0;  /* paddr = 0 to unset notify buffer */
+        a1 = 0x0000ffff00000000ULL; /* intr num = -1 to unreg for intr */
+        a1 += sizeof(struct vnic_devcmd_notify);
+
+        vnic_dev_cmd(vdev, CMD_NOTIFY, &a0, &a1, wait);
+}
+
+static int vnic_dev_notify_ready(struct vnic_dev *vdev)
+{
+        u32 *words;
+        unsigned int nwords = sizeof(struct vnic_devcmd_notify) / 4;
+        unsigned int i;
+        u32 csum;
+
+        if (!vdev->notify)
+                return 0;
+
+        do {
+                csum = 0;
+                memcpy(&vdev->notify_copy, vdev->notify,
+                        sizeof(struct vnic_devcmd_notify));
+                words = (u32 *)&vdev->notify_copy;
+                for (i = 1; i < nwords; i++)
+                        csum += words[i];
+        } while (csum != words[0]);
+
+        return 1;
+}
+
+int vnic_dev_init(struct vnic_dev *vdev, int arg)
+{
+        u64 a0 = (u32)arg, a1 = 0;
+        int wait = 1000;
+        return vnic_dev_cmd(vdev, CMD_INIT, &a0, &a1, wait);
+}
+
+int vnic_dev_link_status(struct vnic_dev *vdev)
+{
+        if (vdev->linkstatus)
+                return *vdev->linkstatus;
+
+        if (!vnic_dev_notify_ready(vdev))
+                return 0;
+
+        return vdev->notify_copy.link_state;
+}
+
+u32 vnic_dev_port_speed(struct vnic_dev *vdev)
+{
+        if (!vnic_dev_notify_ready(vdev))
+                return 0;
+
+        return vdev->notify_copy.port_speed;
+}
+
+u32 vnic_dev_msg_lvl(struct vnic_dev *vdev)
+{
+        if (!vnic_dev_notify_ready(vdev))
+                return 0;
+
+        return vdev->notify_copy.msglvl;
+}
+
+u32 vnic_dev_mtu(struct vnic_dev *vdev)
+{
+        if (!vnic_dev_notify_ready(vdev))
+                return 0;
+
+        return vdev->notify_copy.mtu;
+}
+
+u32 vnic_dev_link_down_cnt(struct vnic_dev *vdev)
+{
+        if (!vnic_dev_notify_ready(vdev))
+                return 0;
+
+        return vdev->notify_copy.link_down_cnt;
+}
+
+void vnic_dev_set_intr_mode(struct vnic_dev *vdev,
+        enum vnic_dev_intr_mode intr_mode)
+{
+        vdev->intr_mode = intr_mode;
+}
+
+enum vnic_dev_intr_mode vnic_dev_get_intr_mode(
+        struct vnic_dev *vdev)
+{
+        return vdev->intr_mode;
+}
+
+void vnic_dev_unregister(struct vnic_dev *vdev)
+{
+        if (vdev) {
+                if (vdev->notify)
+                        pci_free_consistent(vdev->pdev,
+                                sizeof(struct vnic_devcmd_notify),
+                                vdev->notify,
+                                vdev->notify_pa);
+                if (vdev->linkstatus)
+                        pci_free_consistent(vdev->pdev,
+                                sizeof(u32),
+                                vdev->linkstatus,
+                                vdev->linkstatus_pa);
+                if (vdev->stats)
+                        pci_free_consistent(vdev->pdev,
+                                sizeof(struct vnic_dev),
+                                vdev->stats, vdev->stats_pa);
+                if (vdev->fw_info)
+                        pci_free_consistent(vdev->pdev,
+                                sizeof(struct vnic_devcmd_fw_info),
+                                vdev->fw_info, vdev->fw_info_pa);
+                kfree(vdev);
+        }
+}
+
+struct vnic_dev *vnic_dev_register(struct vnic_dev *vdev,
+        void *priv, struct pci_dev *pdev, struct vnic_dev_bar *bar)
+{
+        if (!vdev) {
+                vdev = kzalloc(sizeof(struct vnic_dev), GFP_KERNEL);
+                if (!vdev)
+                        return NULL;
+        }
+
+        vdev->priv = priv;
+        vdev->pdev = pdev;
+
+        if (vnic_dev_discover_res(vdev, bar))
+                goto err_out;
+
+        vdev->devcmd = vnic_dev_get_res(vdev, RES_TYPE_DEVCMD, 0);
+        if (!vdev->devcmd)
+                goto err_out;
+
+        return vdev;
+
+err_out:
+        vnic_dev_unregister(vdev);
+        return NULL;
+}