diff options
| author |   Shannon Nelson <snelson@pensando.io> | 2019-09-03 15:28:08 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2019-09-05 09:24:43 +0200 |
| commit | 6461b446f2a0f40c038f1d09c69d1e5565a84a43 (patch) | |
| tree | 8447c32eccc50896bf64e13b9df6619cb22a6427 /drivers/net/ethernet/pensando/ionic/ionic_lif.c | |
| parent | ionic: Add basic lif support (diff) | |
| download | linux-dev-6461b446f2a0f40c038f1d09c69d1e5565a84a43.tar.xz linux-dev-6461b446f2a0f40c038f1d09c69d1e5565a84a43.zip | |
ionic: Add interrupts and doorbells
The ionic interrupt model is based on interrupt control blocks
accessed through the PCI BAR. Doorbell registers are used by
the driver to signal to the NIC that requests are waiting on
the message queues. Interrupts are used by the NIC to signal
to the driver that answers are waiting on the completion queues.
Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/pensando/ionic/ionic_lif.c')
| -rw-r--r-- | drivers/net/ethernet/pensando/ionic/ionic_lif.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_lif.c b/drivers/net/ethernet/pensando/ionic/ionic_lif.c index 5528043095d8..e9dc97b968b5 100644 --- a/drivers/net/ethernet/pensando/ionic/ionic_lif.c +++ b/drivers/net/ethernet/pensando/ionic/ionic_lif.c @@ -94,6 +94,12 @@ static void ionic_lif_free(struct ionic_lif *lif) lif->info = NULL; lif->info_pa = 0; + /* unmap doorbell page */ + ionic_bus_unmap_dbpage(lif->ionic, lif->kern_dbpage); + lif->kern_dbpage = NULL; + kfree(lif->dbid_inuse); + lif->dbid_inuse = NULL; + /* free netdev & lif */ ionic_debugfs_del_lif(lif); list_del(&lif->list); @@ -136,7 +142,9 @@ void ionic_lifs_deinit(struct ionic *ionic) static int ionic_lif_init(struct ionic_lif *lif) { struct ionic_dev *idev = &lif->ionic->idev; + struct device *dev = lif->ionic->dev; struct ionic_lif_init_comp comp; + int dbpage_num; int err; ionic_debugfs_add_lif(lif); @@ -151,9 +159,40 @@ static int ionic_lif_init(struct ionic_lif *lif) lif->hw_index = le16_to_cpu(comp.hw_index); + /* now that we have the hw_index we can figure out our doorbell page */ + lif->dbid_count = le32_to_cpu(lif->ionic->ident.dev.ndbpgs_per_lif); + if (!lif->dbid_count) { + dev_err(dev, "No doorbell pages, aborting\n"); + return -EINVAL; + } + + lif->dbid_inuse = bitmap_alloc(lif->dbid_count, GFP_KERNEL); + if (!lif->dbid_inuse) { + dev_err(dev, "Failed alloc doorbell id bitmap, aborting\n"); + return -ENOMEM; + } + + /* first doorbell id reserved for kernel (dbid aka pid == zero) */ + set_bit(0, lif->dbid_inuse); + lif->kern_pid = 0; + + dbpage_num = ionic_db_page_num(lif, lif->kern_pid); + lif->kern_dbpage = ionic_bus_map_dbpage(lif->ionic, dbpage_num); + if (!lif->kern_dbpage) { + dev_err(dev, "Cannot map dbpage, aborting\n"); + err = -ENOMEM; + goto err_out_free_dbid; + } + set_bit(IONIC_LIF_INITED, lif->state); return 0; + +err_out_free_dbid: + kfree(lif->dbid_inuse); + lif->dbid_inuse = NULL; + + return err; } int ionic_lifs_init(struct ionic *ionic) |