Re: [RFC PATCH v4 25/27] qedn: Add IO level fastpath functionality
From: Hannes Reinecke <hare@suse.de>
Date: 2021-05-02 11:55:23
Also in:
linux-nvme
On 4/29/21 9:09 PM, Shai Malin wrote:
This patch will present the IO level functionality of qedn
nvme-tcp-offload host mode. The qedn_task_ctx structure is containing
various params and state of the current IO, and is mapped 1x1 to the
fw_task_ctx which is a HW and FW IO context.
A qedn_task is mapped directly to its parent connection.
For every new IO a qedn_task structure will be assigned and they will be
linked for the entire IO's life span.
The patch will include 2 flows:
1. Send new command to the FW:
The flow is: nvme_tcp_ofld_queue_rq() which invokes qedn_send_req()
which invokes qedn_queue_request() which will:
- Assign fw_task_ctx.
- Prepare the Read/Write SG buffer.
- Initialize the HW and FW context.
- Pass the IO to the FW.
2. Process the IO completion:
The flow is: qedn_irq_handler() which invokes qedn_fw_cq_fp_handler()
which invokes qedn_io_work_cq() which will:
- process the FW completion.
- Return the fw_task_ctx to the task pool.
- complete the nvme req.
Acked-by: Igor Russkikh <redacted>
Signed-off-by: Prabhakar Kushwaha <redacted>
Signed-off-by: Omkar Kulkarni <redacted>
Signed-off-by: Michal Kalderon <mkalderon@marvell.com>
Signed-off-by: Ariel Elior <redacted>
Signed-off-by: Shai Malin <redacted>
---
drivers/nvme/hw/qedn/qedn.h | 4 +
drivers/nvme/hw/qedn/qedn_conn.c | 1 +
drivers/nvme/hw/qedn/qedn_task.c | 269 ++++++++++++++++++++++++++++++-
3 files changed, 272 insertions(+), 2 deletions(-)Reviewed-by: Hannes Reinecke <hare@suse.de> Cheers, Hannes -- Dr. Hannes Reinecke Kernel Storage Architect hare@suse.de +49 911 74053 688 SUSE Software Solutions GmbH, Maxfeldstr. 5, 90409 Nürnberg HRB 36809 (AG Nürnberg), Geschäftsführer: Felix Imendörffer