diff options
| -rw-r--r-- | drivers/net/ethernet/microsoft/mana/gdma_main.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/net/ethernet/microsoft/mana/gdma_main.c b/drivers/net/ethernet/microsoft/mana/gdma_main.c index 2ba1fa3336f9..43741cd35af8 100644 --- a/drivers/net/ethernet/microsoft/mana/gdma_main.c +++ b/drivers/net/ethernet/microsoft/mana/gdma_main.c @@ -4,6 +4,7 @@ #include <linux/debugfs.h> #include <linux/module.h> #include <linux/pci.h> +#include <linux/sizes.h> #include <linux/utsname.h> #include <linux/version.h> #include <linux/msi.h> @@ -46,6 +47,18 @@ static int mana_gd_init_pf_regs(struct pci_dev *pdev) u64 sriov_base_off; gc->db_page_size = mana_gd_r32(gc, GDMA_PF_REG_DB_PAGE_SIZE) & 0xFFFF; + + /* mana_gd_ring_doorbell() accesses offsets up to DOORBELL_OFFSET_EQ + * (0xFF8) + 8 bytes = 4KB within each doorbell page, so the page + * size must be at least SZ_4K. + */ + if (gc->db_page_size < SZ_4K) { + dev_err(gc->dev, + "Doorbell page size %llu too small (min %u)\n", + gc->db_page_size, SZ_4K); + return -EPROTO; + } + gc->db_page_off = mana_gd_r64(gc, GDMA_PF_REG_DB_PAGE_OFF); /* Validate doorbell offset is within BAR0 */ @@ -73,6 +86,18 @@ static int mana_gd_init_vf_regs(struct pci_dev *pdev) struct gdma_context *gc = pci_get_drvdata(pdev); gc->db_page_size = mana_gd_r32(gc, GDMA_REG_DB_PAGE_SIZE) & 0xFFFF; + + /* mana_gd_ring_doorbell() accesses offsets up to DOORBELL_OFFSET_EQ + * (0xFF8) + 8 bytes = 4KB within each doorbell page, so the page + * size must be at least SZ_4K. + */ + if (gc->db_page_size < SZ_4K) { + dev_err(gc->dev, + "Doorbell page size %llu too small (min %u)\n", + gc->db_page_size, SZ_4K); + return -EPROTO; + } + gc->db_page_off = mana_gd_r64(gc, GDMA_REG_DB_PAGE_OFFSET); /* Validate doorbell offset is within BAR0 */ |