diff mbox series

[v2] vdpa/sfc: handle sync issue between qemu and vhost-user

Message ID 20220628052926.21319-1-asaini@xilinx.com (mailing list archive)
State Accepted, archived
Delegated to: Maxime Coquelin
Headers
Series [v2] vdpa/sfc: handle sync issue between qemu and vhost-user |

Checks

Context Check Description
ci/checkpatch success coding style OK
ci/Intel-compilation success Compilation OK
ci/intel-Testing success Testing PASS
ci/iol-intel-Performance success Performance Testing PASS
ci/iol-intel-Functional success Functional Testing PASS
ci/iol-aarch64-unit-testing success Testing PASS
ci/github-robot: build success github build: passed
ci/iol-x86_64-compile-testing success Testing PASS
ci/iol-aarch64-compile-testing success Testing PASS
ci/iol-x86_64-unit-testing success Testing PASS
ci/iol-abi-testing success Testing PASS

Commit Message

abhimanyu.saini@xilinx.com June 28, 2022, 5:29 a.m. UTC 
  From: Abhimanyu Saini <absaini@amd.com>

When DPDK app is running in the VF, it sometimes rings the doorbell
before dev_config has had a chance to complete and hence it misses
the event. As workaround, ring the doorbell when vDPA reports the
notify_area to QEMU.

Fixes: 630be406dcbf ("vdpa/sfc: get queue notify area info")
Cc: stable@dpdk.org

Signed-off-by: Vijay Kumar Srivastava <vsrivast@xilinx.com>
Signed-off-by: Abhimanyu Saini <absaini@amd.com>
---
v1:
* Update the commit id that this patch fixes

 drivers/vdpa/sfc/sfc_vdpa_ops.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

Comments

Andrew Rybchenko June 28, 2022, 9:01 a.m. UTC | #1 
On 6/28/22 08:29, abhimanyu.saini@xilinx.com wrote:
> From: Abhimanyu Saini <absaini@amd.com>
> 
> When DPDK app is running in the VF, it sometimes rings the doorbell
> before dev_config has had a chance to complete and hence it misses
> the event. As workaround, ring the doorbell when vDPA reports the
> notify_area to QEMU.
> 
> Fixes: 630be406dcbf ("vdpa/sfc: get queue notify area info")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Vijay Kumar Srivastava <vsrivast@xilinx.com>
> Signed-off-by: Abhimanyu Saini <absaini@amd.com>

Acked-by: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>
Maxime Coquelin June 30, 2022, 12:56 p.m. UTC | #2 
On 6/28/22 07:29, abhimanyu.saini@xilinx.com wrote:
> From: Abhimanyu Saini <absaini@amd.com>
> 
> When DPDK app is running in the VF, it sometimes rings the doorbell
> before dev_config has had a chance to complete and hence it misses
> the event. As workaround, ring the doorbell when vDPA reports the
> notify_area to QEMU.
> 
> Fixes: 630be406dcbf ("vdpa/sfc: get queue notify area info")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Vijay Kumar Srivastava <vsrivast@xilinx.com>
> Signed-off-by: Abhimanyu Saini <absaini@amd.com>
> ---
> v1:
> * Update the commit id that this patch fixes
> 
>   drivers/vdpa/sfc/sfc_vdpa_ops.c | 14 ++++++++++++++
>   1 file changed, 14 insertions(+)
> 

Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>

Thanks,
Maxime
Maxime Coquelin July 1, 2022, 1:58 p.m. UTC | #3 
On 6/28/22 07:29, abhimanyu.saini@xilinx.com wrote:
> From: Abhimanyu Saini <absaini@amd.com>
> 
> When DPDK app is running in the VF, it sometimes rings the doorbell
> before dev_config has had a chance to complete and hence it misses
> the event. As workaround, ring the doorbell when vDPA reports the
> notify_area to QEMU.
> 
> Fixes: 630be406dcbf ("vdpa/sfc: get queue notify area info")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Vijay Kumar Srivastava <vsrivast@xilinx.com>
> Signed-off-by: Abhimanyu Saini <absaini@amd.com>
> ---
> v1:
> * Update the commit id that this patch fixes
> 
>   drivers/vdpa/sfc/sfc_vdpa_ops.c | 14 ++++++++++++++
>   1 file changed, 14 insertions(+)
> 

Applied to dpdk-next-virtio/main.

Thanks,
Maxime
diff mbox series

Patch

diff --git a/drivers/vdpa/sfc/sfc_vdpa_ops.c b/drivers/vdpa/sfc/sfc_vdpa_ops.c
index b3d9b6c..63aa52d 100644
--- a/drivers/vdpa/sfc/sfc_vdpa_ops.c
+++ b/drivers/vdpa/sfc/sfc_vdpa_ops.c
@@ -794,6 +794,8 @@ 
 	int vfio_dev_fd;
 	efx_rc_t rc;
 	unsigned int bar_offset;
+	volatile void *doorbell;
+	struct rte_pci_device *pci_dev;
 	struct rte_vdpa_device *vdpa_dev;
 	struct sfc_vdpa_ops_data *ops_data;
 	struct vfio_region_info reg = { .argsz = sizeof(reg) };
@@ -856,6 +858,18 @@ 
 	sfc_vdpa_info(dev, "vDPA ops get_notify_area :: offset : 0x%" PRIx64,
 		      *offset);
 
+	pci_dev = sfc_vdpa_adapter_by_dev_handle(dev)->pdev;
+	doorbell = (uint8_t *)pci_dev->mem_resource[reg.index].addr + *offset;
+
+	/*
+	 * virtio-net driver in VM sends queue notifications before
+	 * vDPA has a chance to setup the queues and notification area,
+	 * and hence the HW misses these doorbell notifications.
+	 * Since, it is safe to send duplicate doorbell, send another
+	 * doorbell from vDPA driver as workaround for this timing issue.
+	 */
+	rte_write16(qid, doorbell);
+
 	return 0;
 }