[v1] net: mana: Record doorbell physical address in PF mode

[PATCH net-next] net: mana: Record doorbell physical address in PF mode

longli@linuxonhyperv.com posted 1 patch 4 months ago

Diff against v2 v3
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There is a newer version of this series

drivers/net/ethernet/microsoft/mana/gdma_main.c | 3 +++
1 file changed, 3 insertions(+)

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[PATCH net-next] net: mana: Record doorbell physical address in PF mode

Posted by longli@linuxonhyperv.com 4 months ago

From: Long Li <longli@microsoft.com>

MANA supports RDMA in PF mode. The driver should record the doorbell
physical address when in PF mode.

Signed-off-by: Long Li <longli@microsoft.com>
---
 drivers/net/ethernet/microsoft/mana/gdma_main.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/microsoft/mana/gdma_main.c b/drivers/net/ethernet/microsoft/mana/gdma_main.c
index 3504507477c6..52cf7112762c 100644
--- a/drivers/net/ethernet/microsoft/mana/gdma_main.c
+++ b/drivers/net/ethernet/microsoft/mana/gdma_main.c
@@ -31,6 +31,9 @@ static void mana_gd_init_pf_regs(struct pci_dev *pdev)
 	gc->db_page_base = gc->bar0_va +
 				mana_gd_r64(gc, GDMA_PF_REG_DB_PAGE_OFF);
 
+	gc->phys_db_page_base = gc->bar0_pa +
+				mana_gd_r64(gc, GDMA_PF_REG_DB_PAGE_OFF);
+
 	sriov_base_off = mana_gd_r64(gc, GDMA_SRIOV_REG_CFG_BASE_OFF);
 
 	sriov_base_va = gc->bar0_va + sriov_base_off;
-- 
2.25.1

Re: [PATCH net-next] net: mana: Record doorbell physical address in PF mode

Posted by Jakub Kicinski 4 months ago

On Mon,  9 Jun 2025 16:09:40 -0700 longli@linuxonhyperv.com wrote:
> From: Long Li <longli@microsoft.com>
> 
> MANA supports RDMA in PF mode. The driver should record the doorbell
> physical address when in PF mode.

Could you explain in more detail what happens if it doesn't?
What user-visible improvement does this patch bring?
-- 
pw-bot: cr