bnxt_en: Add ULP calls to stop and restart IRQs.

When the driver needs to re-initailize the IRQ vectors, we make the
new ulp_irq_stop() call to tell the RDMA driver to disable and free
the IRQ vectors.  After IRQ vectors have been re-initailized, we
make the ulp_irq_restart() call to tell the RDMA driver that
IRQs can be restarted.

Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 6a1d18f..1991f0c 100644 (file)
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -6064,8 +6064,10 @@ int bnxt_reserve_rings(struct bnxt *bp)
        }
        if ((bp->flags & BNXT_FLAG_NEW_RM) &&
            (bnxt_get_num_msix(bp) != bp->total_irqs)) {
+               bnxt_ulp_irq_stop(bp);
                bnxt_clear_int_mode(bp);
                rc = bnxt_init_int_mode(bp);
+               bnxt_ulp_irq_restart(bp, rc);
                if (rc)
                        return rc;
        }
@@ -8575,16 +8577,15 @@ int bnxt_restore_pf_fw_resources(struct bnxt *bp)
        int rc;
 
        ASSERT_RTNL();
-       if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP))
-               return 0;
-
        bnxt_hwrm_func_qcaps(bp);
 
        if (netif_running(bp->dev))
                __bnxt_close_nic(bp, true, false);
 
+       bnxt_ulp_irq_stop(bp);
        bnxt_clear_int_mode(bp);
        rc = bnxt_init_int_mode(bp);
+       bnxt_ulp_irq_restart(bp, rc);
 
        if (netif_running(bp->dev)) {
                if (rc)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.c
index 2583923..347e4f9 100644 (file)
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.c
@@ -1,6 +1,6 @@
 /* Broadcom NetXtreme-C/E network driver.
  *
- * Copyright (c) 2016 Broadcom Limited
+ * Copyright (c) 2016-2018 Broadcom Limited
  *
  * 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
@@ -101,13 +101,27 @@ static int bnxt_unregister_dev(struct bnxt_en_dev *edev, int ulp_id)
        return 0;
 }
 
+static void bnxt_fill_msix_vecs(struct bnxt *bp, struct bnxt_msix_entry *ent)
+{
+       struct bnxt_en_dev *edev = bp->edev;
+       int num_msix, idx, i;
+
+       num_msix = edev->ulp_tbl[BNXT_ROCE_ULP].msix_requested;
+       idx = edev->ulp_tbl[BNXT_ROCE_ULP].msix_base;
+       for (i = 0; i < num_msix; i++) {
+               ent[i].vector = bp->irq_tbl[idx + i].vector;
+               ent[i].ring_idx = idx + i;
+               ent[i].db_offset = (idx + i) * 0x80;
+       }
+}
+
 static int bnxt_req_msix_vecs(struct bnxt_en_dev *edev, int ulp_id,
                              struct bnxt_msix_entry *ent, int num_msix)
 {
        struct net_device *dev = edev->net;
        struct bnxt *bp = netdev_priv(dev);
        int max_idx, max_cp_rings;
-       int avail_msix, i, idx;
+       int avail_msix, idx;
        int rc = 0;
 
        ASSERT_RTNL();
@@ -154,13 +168,10 @@ static int bnxt_req_msix_vecs(struct bnxt_en_dev *edev, int ulp_id,
                avail_msix = hw_resc->resv_cp_rings - bp->cp_nr_rings;
                edev->ulp_tbl[ulp_id].msix_requested = avail_msix;
        }
-       for (i = 0; i < avail_msix; i++) {
-               ent[i].vector = bp->irq_tbl[idx + i].vector;
-               ent[i].ring_idx = idx + i;
-               ent[i].db_offset = (idx + i) * 0x80;
-       }
+       bnxt_fill_msix_vecs(bp, ent);
        bnxt_set_max_func_irqs(bp, bnxt_get_max_func_irqs(bp) - avail_msix);
        bnxt_set_max_func_cp_rings(bp, max_cp_rings - avail_msix);
+       edev->flags |= BNXT_EN_FLAG_MSIX_REQUESTED;
        return avail_msix;
 }
 
@@ -174,11 +185,15 @@ static int bnxt_free_msix_vecs(struct bnxt_en_dev *edev, int ulp_id)
        if (ulp_id != BNXT_ROCE_ULP)
                return -EINVAL;
 
+       if (!(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED))
+               return 0;
+
        max_cp_rings = bnxt_get_max_func_cp_rings(bp);
        msix_requested = edev->ulp_tbl[ulp_id].msix_requested;
        bnxt_set_max_func_cp_rings(bp, max_cp_rings + msix_requested);
        edev->ulp_tbl[ulp_id].msix_requested = 0;
        bnxt_set_max_func_irqs(bp, bnxt_get_max_func_irqs(bp) + msix_requested);
+       edev->flags &= ~BNXT_EN_FLAG_MSIX_REQUESTED;
        if (netif_running(dev)) {
                bnxt_close_nic(bp, true, false);
                bnxt_open_nic(bp, true, false);
@@ -340,6 +355,58 @@ void bnxt_ulp_shutdown(struct bnxt *bp)
        }
 }
 
+void bnxt_ulp_irq_stop(struct bnxt *bp)
+{
+       struct bnxt_en_dev *edev = bp->edev;
+       struct bnxt_ulp_ops *ops;
+
+       if (!edev || !(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED))
+               return;
+
+       if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) {
+               struct bnxt_ulp *ulp = &edev->ulp_tbl[BNXT_ROCE_ULP];
+
+               if (!ulp->msix_requested)
+                       return;
+
+               ops = rtnl_dereference(ulp->ulp_ops);
+               if (!ops || !ops->ulp_irq_stop)
+                       return;
+               ops->ulp_irq_stop(ulp->handle);
+       }
+}
+
+void bnxt_ulp_irq_restart(struct bnxt *bp, int err)
+{
+       struct bnxt_en_dev *edev = bp->edev;
+       struct bnxt_ulp_ops *ops;
+
+       if (!edev || !(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED))
+               return;
+
+       if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) {
+               struct bnxt_ulp *ulp = &edev->ulp_tbl[BNXT_ROCE_ULP];
+               struct bnxt_msix_entry *ent = NULL;
+
+               if (!ulp->msix_requested)
+                       return;
+
+               ops = rtnl_dereference(ulp->ulp_ops);
+               if (!ops || !ops->ulp_irq_restart)
+                       return;
+
+               if (!err) {
+                       ent = kcalloc(ulp->msix_requested, sizeof(*ent),
+                                     GFP_KERNEL);
+                       if (!ent)
+                               return;
+                       bnxt_fill_msix_vecs(bp, ent);
+               }
+               ops->ulp_irq_restart(ulp->handle, ent);
+               kfree(ent);
+       }
+}
+
 void bnxt_ulp_async_events(struct bnxt *bp, struct hwrm_async_event_cmpl *cmpl)
 {
        u16 event_id = le16_to_cpu(cmpl->event_id);

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.h b/drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.h
index c9fa7eb..df48ac7 100644 (file)
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.h
@@ -1,6 +1,6 @@
 /* Broadcom NetXtreme-C/E network driver.
  *
- * Copyright (c) 2016 Broadcom Limited
+ * Copyright (c) 2016-2018 Broadcom Limited
  *
  * 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
@@ -20,6 +20,12 @@
 struct hwrm_async_event_cmpl;
 struct bnxt;
 
+struct bnxt_msix_entry {
+       u32     vector;
+       u32     ring_idx;
+       u32     db_offset;
+};
+
 struct bnxt_ulp_ops {
        /* async_notifier() cannot sleep (in BH context) */
        void (*ulp_async_notifier)(void *, struct hwrm_async_event_cmpl *);
@@ -27,12 +33,8 @@ struct bnxt_ulp_ops {
        void (*ulp_start)(void *);
        void (*ulp_sriov_config)(void *, int);
        void (*ulp_shutdown)(void *);
-};
-
-struct bnxt_msix_entry {
-       u32     vector;
-       u32     ring_idx;
-       u32     db_offset;
+       void (*ulp_irq_stop)(void *);
+       void (*ulp_irq_restart)(void *, struct bnxt_msix_entry *);
 };
 
 struct bnxt_fw_msg {
@@ -61,6 +63,7 @@ struct bnxt_en_dev {
        #define BNXT_EN_FLAG_ROCEV2_CAP         0x2
        #define BNXT_EN_FLAG_ROCE_CAP           (BNXT_EN_FLAG_ROCEV1_CAP | \
                                                 BNXT_EN_FLAG_ROCEV2_CAP)
+       #define BNXT_EN_FLAG_MSIX_REQUESTED     0x4
        const struct bnxt_en_ops        *en_ops;
        struct bnxt_ulp                 ulp_tbl[BNXT_MAX_ULP];
 };
@@ -92,6 +95,8 @@ void bnxt_ulp_stop(struct bnxt *bp);
 void bnxt_ulp_start(struct bnxt *bp);
 void bnxt_ulp_sriov_cfg(struct bnxt *bp, int num_vfs);
 void bnxt_ulp_shutdown(struct bnxt *bp);
+void bnxt_ulp_irq_stop(struct bnxt *bp);
+void bnxt_ulp_irq_restart(struct bnxt *bp, int err);
 void bnxt_ulp_async_events(struct bnxt *bp, struct hwrm_async_event_cmpl *cmpl);
 struct bnxt_en_dev *bnxt_ulp_probe(struct net_device *dev);