[SCSI] bnx2: Add support for CNIC driver.

Add interface and functions to support a new CNIC driver to drive
the Broadcom bnx2 hardware for iSCSI offload.

Signed-off-by: Michael Chan <mchan@broadcom.com>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

2 files changed, 208 insertions, 3 deletions

diff --git a/drivers/net/bnx2.c b/drivers/net/bnx2.c
index b0cb29d4cc01..3f5fcb0156a1 100644
--- a/drivers/net/bnx2.c
+++ b/drivers/net/bnx2.c
@@ -49,6 +49,10 @@
 #include <linux/firmware.h>
 #include <linux/log2.h>
 
+#if defined(CONFIG_CNIC) || defined(CONFIG_CNIC_MODULE)
+#define BCM_CNIC 1
+#include "cnic_if.h"
+#endif
 #include "bnx2.h"
 #include "bnx2_fw.h"
 
@@ -315,6 +319,158 @@ bnx2_ctx_wr(struct bnx2 *bp, u32 cid_addr, u32 offset, u32 val)
         spin_unlock_bh(&bp->indirect_lock);
 }
 
+#ifdef BCM_CNIC
+static int
+bnx2_drv_ctl(struct net_device *dev, struct drv_ctl_info *info)
+{
+        struct bnx2 *bp = netdev_priv(dev);
+        struct drv_ctl_io *io = &info->data.io;
+
+        switch (info->cmd) {
+        case DRV_CTL_IO_WR_CMD:
+                bnx2_reg_wr_ind(bp, io->offset, io->data);
+                break;
+        case DRV_CTL_IO_RD_CMD:
+                io->data = bnx2_reg_rd_ind(bp, io->offset);
+                break;
+        case DRV_CTL_CTX_WR_CMD:
+                bnx2_ctx_wr(bp, io->cid_addr, io->offset, io->data);
+                break;
+        default:
+                return -EINVAL;
+        }
+        return 0;
+}
+
+static void bnx2_setup_cnic_irq_info(struct bnx2 *bp)
+{
+        struct cnic_eth_dev *cp = &bp->cnic_eth_dev;
+        struct bnx2_napi *bnapi = &bp->bnx2_napi[0];
+        int sb_id;
+
+        if (bp->flags & BNX2_FLAG_USING_MSIX) {
+                cp->drv_state |= CNIC_DRV_STATE_USING_MSIX;
+                bnapi->cnic_present = 0;
+                sb_id = bp->irq_nvecs;
+                cp->irq_arr[0].irq_flags |= CNIC_IRQ_FL_MSIX;
+        } else {
+                cp->drv_state &= ~CNIC_DRV_STATE_USING_MSIX;
+                bnapi->cnic_tag = bnapi->last_status_idx;
+                bnapi->cnic_present = 1;
+                sb_id = 0;
+                cp->irq_arr[0].irq_flags &= ~CNIC_IRQ_FL_MSIX;
+        }
+
+        cp->irq_arr[0].vector = bp->irq_tbl[sb_id].vector;
+        cp->irq_arr[0].status_blk = (void *)
+                ((unsigned long) bnapi->status_blk.msi +
+                (BNX2_SBLK_MSIX_ALIGN_SIZE * sb_id));
+        cp->irq_arr[0].status_blk_num = sb_id;
+        cp->num_irq = 1;
+}
+
+static int bnx2_register_cnic(struct net_device *dev, struct cnic_ops *ops,
+                              void *data)
+{
+        struct bnx2 *bp = netdev_priv(dev);
+        struct cnic_eth_dev *cp = &bp->cnic_eth_dev;
+
+        if (ops == NULL)
+                return -EINVAL;
+
+        if (cp->drv_state & CNIC_DRV_STATE_REGD)
+                return -EBUSY;
+
+        bp->cnic_data = data;
+        rcu_assign_pointer(bp->cnic_ops, ops);
+
+        cp->num_irq = 0;
+        cp->drv_state = CNIC_DRV_STATE_REGD;
+
+        bnx2_setup_cnic_irq_info(bp);
+
+        return 0;
+}
+
+static int bnx2_unregister_cnic(struct net_device *dev)
+{
+        struct bnx2 *bp = netdev_priv(dev);
+        struct bnx2_napi *bnapi = &bp->bnx2_napi[0];
+        struct cnic_eth_dev *cp = &bp->cnic_eth_dev;
+
+        cp->drv_state = 0;
+        bnapi->cnic_present = 0;
+        rcu_assign_pointer(bp->cnic_ops, NULL);
+        synchronize_rcu();
+        return 0;
+}
+
+struct cnic_eth_dev *bnx2_cnic_probe(struct net_device *dev)
+{
+        struct bnx2 *bp = netdev_priv(dev);
+        struct cnic_eth_dev *cp = &bp->cnic_eth_dev;
+
+        cp->drv_owner = THIS_MODULE;
+        cp->chip_id = bp->chip_id;
+        cp->pdev = bp->pdev;
+        cp->io_base = bp->regview;
+        cp->drv_ctl = bnx2_drv_ctl;
+        cp->drv_register_cnic = bnx2_register_cnic;
+        cp->drv_unregister_cnic = bnx2_unregister_cnic;
+
+        return cp;
+}
+EXPORT_SYMBOL(bnx2_cnic_probe);
+
+static void
+bnx2_cnic_stop(struct bnx2 *bp)
+{
+        struct cnic_ops *c_ops;
+        struct cnic_ctl_info info;
+
+        rcu_read_lock();
+        c_ops = rcu_dereference(bp->cnic_ops);
+        if (c_ops) {
+                info.cmd = CNIC_CTL_STOP_CMD;
+                c_ops->cnic_ctl(bp->cnic_data, &info);
+        }
+        rcu_read_unlock();
+}
+
+static void
+bnx2_cnic_start(struct bnx2 *bp)
+{
+        struct cnic_ops *c_ops;
+        struct cnic_ctl_info info;
+
+        rcu_read_lock();
+        c_ops = rcu_dereference(bp->cnic_ops);
+        if (c_ops) {
+                if (!(bp->flags & BNX2_FLAG_USING_MSIX)) {
+                        struct bnx2_napi *bnapi = &bp->bnx2_napi[0];
+
+                        bnapi->cnic_tag = bnapi->last_status_idx;
+                }
+                info.cmd = CNIC_CTL_START_CMD;
+                c_ops->cnic_ctl(bp->cnic_data, &info);
+        }
+        rcu_read_unlock();
+}
+
+#else
+
+static void
+bnx2_cnic_stop(struct bnx2 *bp)
+{
+}
+
+static void
+bnx2_cnic_start(struct bnx2 *bp)
+{
+}
+
+#endif
+
 static int
 bnx2_read_phy(struct bnx2 *bp, u32 reg, u32 *val)
 {
@@ -488,6 +644,7 @@ bnx2_napi_enable(struct bnx2 *bp)
 static void
 bnx2_netif_stop(struct bnx2 *bp)
 {
+        bnx2_cnic_stop(bp);
         bnx2_disable_int_sync(bp);
         if (netif_running(bp->dev)) {
                 bnx2_napi_disable(bp);
@@ -504,6 +661,7 @@ bnx2_netif_start(struct bnx2 *bp)
                         netif_tx_wake_all_queues(bp->dev);
                         bnx2_napi_enable(bp);
                         bnx2_enable_int(bp);
+                        bnx2_cnic_start(bp);
                 }
         }
 }
@@ -3164,6 +3322,11 @@ bnx2_has_work(struct bnx2_napi *bnapi)
         if (bnx2_has_fast_work(bnapi))
                 return 1;
 
+#ifdef BCM_CNIC
+        if (bnapi->cnic_present && (bnapi->cnic_tag != sblk->status_idx))
+                return 1;
+#endif
+
         if ((sblk->status_attn_bits & STATUS_ATTN_EVENTS) !=
             (sblk->status_attn_bits_ack & STATUS_ATTN_EVENTS))
                 return 1;
@@ -3193,6 +3356,23 @@ bnx2_chk_missed_msi(struct bnx2 *bp)
         bp->idle_chk_status_idx = bnapi->last_status_idx;
 }
 
+#ifdef BCM_CNIC
+static void bnx2_poll_cnic(struct bnx2 *bp, struct bnx2_napi *bnapi)
+{
+        struct cnic_ops *c_ops;
+
+        if (!bnapi->cnic_present)
+                return;
+
+        rcu_read_lock();
+        c_ops = rcu_dereference(bp->cnic_ops);
+        if (c_ops)
+                bnapi->cnic_tag = c_ops->cnic_handler(bp->cnic_data,
+                                                      bnapi->status_blk.msi);
+        rcu_read_unlock();
+}
+#endif
+
 static void bnx2_poll_link(struct bnx2 *bp, struct bnx2_napi *bnapi)
 {
         struct status_block *sblk = bnapi->status_blk.msi;
@@ -3267,6 +3447,10 @@ static int bnx2_poll(struct napi_struct *napi, int budget)
 
                 work_done = bnx2_poll_work(bp, bnapi, work_done, budget);
 
+#ifdef BCM_CNIC
+                bnx2_poll_cnic(bp, bnapi);
+#endif
+
                 /* bnapi->last_status_idx is used below to tell the hw how
                  * much work has been processed, so we must read it before
                  * checking for more work.
@@ -4632,8 +4816,11 @@ bnx2_init_chip(struct bnx2 *bp)
         val = REG_RD(bp, BNX2_MQ_CONFIG);
         val &= ~BNX2_MQ_CONFIG_KNL_BYP_BLK_SIZE;
         val |= BNX2_MQ_CONFIG_KNL_BYP_BLK_SIZE_256;
-        if (CHIP_ID(bp) == CHIP_ID_5709_A0 || CHIP_ID(bp) == CHIP_ID_5709_A1)
-                val |= BNX2_MQ_CONFIG_HALT_DIS;
+        if (CHIP_NUM(bp) == CHIP_NUM_5709) {
+                val |= BNX2_MQ_CONFIG_BIN_MQ_MODE;
+                if (CHIP_REV(bp) == CHIP_REV_Ax)
+                        val |= BNX2_MQ_CONFIG_HALT_DIS;
+        }
 
         REG_WR(bp, BNX2_MQ_CONFIG, val);
 
@@ -7471,7 +7658,7 @@ bnx2_init_board(struct pci_dev *pdev, struct net_device *dev)
         INIT_WORK(&bp->reset_task, bnx2_reset_task);
 
         dev->base_addr = dev->mem_start = pci_resource_start(pdev, 0);
-        mem_len = MB_GET_CID_ADDR(TX_TSS_CID + TX_MAX_TSS_RINGS);
+        mem_len = MB_GET_CID_ADDR(TX_TSS_CID + TX_MAX_TSS_RINGS + 1);
         dev->mem_end = dev->mem_start + mem_len;
         dev->irq = pdev->irq;
 
diff --git a/drivers/net/bnx2.h b/drivers/net/bnx2.h
index 5b570e17c839..a1ff739bc9b5 100644
--- a/drivers/net/bnx2.h
+++ b/drivers/net/bnx2.h
@@ -361,6 +361,9 @@ struct l2_fhdr {
 #define BNX2_L2CTX_CTX_TYPE_CTX_BD_CHN_TYPE_VALUE        (1<<28)
 
 #define BNX2_L2CTX_HOST_BDIDX                           0x00000004
+#define BNX2_L2CTX_STATUSB_NUM_SHIFT                     16
+#define BNX2_L2CTX_STATUSB_NUM(sb_id)                    \
+        (((sb_id) > 0) ? (((sb_id) + 7) << BNX2_L2CTX_STATUSB_NUM_SHIFT) : 0)
 #define BNX2_L2CTX_HOST_BSEQ                            0x00000008
 #define BNX2_L2CTX_NX_BSEQ                              0x0000000c
 #define BNX2_L2CTX_NX_BDHADDR_HI                        0x00000010
@@ -5900,6 +5903,7 @@ struct l2_fhdr {
 #define BNX2_RXP_FTQ_CTL_CUR_DEPTH                       (0x3ffL<<22)
 
 #define BNX2_RXP_SCRATCH                                0x000e0000
+#define BNX2_RXP_SCRATCH_RXP_FLOOD                       0x000e0024
 #define BNX2_RXP_SCRATCH_RSS_TBL_SZ                      0x000e0038
 #define BNX2_RXP_SCRATCH_RSS_TBL                         0x000e003c
 #define BNX2_RXP_SCRATCH_RSS_TBL_MAX_ENTRIES             128
@@ -6678,6 +6682,11 @@ struct bnx2_napi {
         u32                     last_status_idx;
         u32                     int_num;
 
+#ifdef BCM_CNIC
+        u32                     cnic_tag;
+        int                     cnic_present;
+#endif
+
         struct bnx2_rx_ring_info        rx_ring;
         struct bnx2_tx_ring_info        tx_ring;
 };
@@ -6727,6 +6736,11 @@ struct bnx2 {
         int             tx_ring_size;
         u32             tx_wake_thresh;
 
+#ifdef BCM_CNIC
+        struct cnic_ops         *cnic_ops;
+        void                    *cnic_data;
+#endif
+
         /* End of fields used in the performance code paths. */
 
         unsigned int            current_interval;
@@ -6885,6 +6899,10 @@ struct bnx2 {
 
         u32                     idle_chk_status_idx;
 
+#ifdef BCM_CNIC
+        struct cnic_eth_dev     cnic_eth_dev;
+#endif
+
         const struct firmware   *mips_firmware;
         const struct firmware   *rv2p_firmware;
 };