From: Sagi Grimberg <sagi@grimberg.me>
Date: Wed, 3 Jul 2019 14:08:04 -0700
Subject: [PATCH] nvme-tcp: support simple polling
References: bsc#1156419,jsc#SLE-8281
Git-commit: 1a9460cef571100487cde9c44110a5afff2e9ea2
Patch-mainline: v5.4-rc1

Simple polling support via socket busy_poll interface.
Although we do not shutdown interrupts but simply hammer
the socket poll, we can sometimes find completions faster
than the normal interrupt driven RX path.

We add per queue nr_cqe counter that resets every time
RX path is invoked such that .poll callback can return it
to stay consistent with the semantics.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Hannes Reinecke <hare@suse.de>
---
 drivers/nvme/host/tcp.c | 51 +++++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 45 insertions(+), 6 deletions(-)

diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c
index e4d1dcd46b7a..17df4a9bfb13 100644
--- a/drivers/nvme/host/tcp.c
+++ b/drivers/nvme/host/tcp.c
@@ -13,6 +13,7 @@
 #include <net/tcp.h>
 #include <linux/blk-mq.h>
 #include <crypto/hash.h>
+#include <net/busy_poll.h>
 
 #include "nvme.h"
 #include "fabrics.h"
@@ -72,6 +73,7 @@ struct nvme_tcp_queue {
 	int			pdu_offset;
 	size_t			data_remaining;
 	size_t			ddgst_remaining;
+	unsigned int		nr_cqe;
 
 	/* send state */
 	struct nvme_tcp_request *request;
@@ -438,6 +440,7 @@ static int nvme_tcp_process_nvme_cqe(struct nvme_tcp_queue *queue,
 	}
 
 	nvme_end_request(rq, cqe->status, cqe->result);
+	queue->nr_cqe++;
 
 	return 0;
 }
@@ -696,8 +699,10 @@ static int nvme_tcp_recv_data(struct nvme_tcp_queue *queue, struct sk_buff *skb,
 			nvme_tcp_ddgst_final(queue->rcv_hash, &queue->exp_ddgst);
 			queue->ddgst_remaining = NVME_TCP_DIGEST_LENGTH;
 		} else {
-			if (pdu->hdr.flags & NVME_TCP_F_DATA_SUCCESS)
+			if (pdu->hdr.flags & NVME_TCP_F_DATA_SUCCESS) {
 				nvme_tcp_end_request(rq, NVME_SC_SUCCESS);
+				queue->nr_cqe++;
+			}
 			nvme_tcp_init_recv_ctx(queue);
 		}
 	}
@@ -737,6 +742,7 @@ static int nvme_tcp_recv_ddgst(struct nvme_tcp_queue *queue,
 						pdu->command_id);
 
 		nvme_tcp_end_request(rq, NVME_SC_SUCCESS);
+		queue->nr_cqe++;
 	}
 
 	nvme_tcp_init_recv_ctx(queue);
@@ -1026,6 +1032,7 @@ static int nvme_tcp_try_recv(struct nvme_tcp_queue *queue)
 	rd_desc.arg.data = queue;
 	rd_desc.count = 1;
 	lock_sock(sk);
+	queue->nr_cqe = 0;
 	consumed = sock->ops->read_sock(sk, &rd_desc, nvme_tcp_recv_skb);
 	release_sock(sk);
 	return consumed;
@@ -1367,6 +1374,7 @@ static int nvme_tcp_alloc_queue(struct nvme_ctrl *nctrl,
 	queue->sock->sk->sk_data_ready = nvme_tcp_data_ready;
 	queue->sock->sk->sk_state_change = nvme_tcp_state_change;
 	queue->sock->sk->sk_write_space = nvme_tcp_write_space;
+	queue->sock->sk->sk_ll_usec = 1;
 	write_unlock_bh(&queue->sock->sk->sk_callback_lock);
 
 	return 0;
@@ -1465,7 +1473,7 @@ static struct blk_mq_tag_set *nvme_tcp_alloc_tagset(struct nvme_ctrl *nctrl,
 		set->driver_data = ctrl;
 		set->nr_hw_queues = nctrl->queue_count - 1;
 		set->timeout = NVME_IO_TIMEOUT;
-		set->nr_maps = 2 /* default + read */;
+		set->nr_maps = nctrl->opts->nr_poll_queues ? HCTX_MAX_TYPES : 2;
 	}
 
 	ret = blk_mq_alloc_tag_set(set);
@@ -1564,6 +1572,7 @@ static unsigned int nvme_tcp_nr_io_queues(struct nvme_ctrl *ctrl)
 
 	nr_io_queues = min(ctrl->opts->nr_io_queues, num_online_cpus());
 	nr_io_queues += min(ctrl->opts->nr_write_queues, num_online_cpus());
+	nr_io_queues += min(ctrl->opts->nr_poll_queues, num_online_cpus());
 
 	return nr_io_queues;
 }
@@ -1595,6 +1604,12 @@ static void nvme_tcp_set_io_queues(struct nvme_ctrl *nctrl,
 			min(opts->nr_io_queues, nr_io_queues);
 		nr_io_queues -= ctrl->io_queues[HCTX_TYPE_DEFAULT];
 	}
+
+	if (opts->nr_poll_queues && nr_io_queues) {
+		/* map dedicated poll queues only if we have queues left */
+		ctrl->io_queues[HCTX_TYPE_POLL] =
+			min(opts->nr_poll_queues, nr_io_queues);
+	}
 }
 
 static int nvme_tcp_alloc_io_queues(struct nvme_ctrl *ctrl)
@@ -2142,14 +2157,36 @@ static int nvme_tcp_map_queues(struct blk_mq_tag_set *set)
 	blk_mq_map_queues(&set->map[HCTX_TYPE_DEFAULT]);
 	blk_mq_map_queues(&set->map[HCTX_TYPE_READ]);
 
+	if (opts->nr_poll_queues && ctrl->io_queues[HCTX_TYPE_POLL]) {
+		/* map dedicated poll queues only if we have queues left */
+		set->map[HCTX_TYPE_POLL].nr_queues =
+				ctrl->io_queues[HCTX_TYPE_POLL];
+		set->map[HCTX_TYPE_POLL].queue_offset =
+			ctrl->io_queues[HCTX_TYPE_DEFAULT] +
+			ctrl->io_queues[HCTX_TYPE_READ];
+		blk_mq_map_queues(&set->map[HCTX_TYPE_POLL]);
+	}
+
 	dev_info(ctrl->ctrl.device,
-		"mapped %d/%d default/read queues.\n",
+		"mapped %d/%d/%d default/read/poll queues.\n",
 		ctrl->io_queues[HCTX_TYPE_DEFAULT],
-		ctrl->io_queues[HCTX_TYPE_READ]);
+		ctrl->io_queues[HCTX_TYPE_READ],
+		ctrl->io_queues[HCTX_TYPE_POLL]);
 
 	return 0;
 }
 
+static int nvme_tcp_poll(struct blk_mq_hw_ctx *hctx)
+{
+	struct nvme_tcp_queue *queue = hctx->driver_data;
+	struct sock *sk = queue->sock->sk;
+
+	if (sk_can_busy_loop(sk) && skb_queue_empty(&sk->sk_receive_queue))
+		sk_busy_loop(sk, true);
+	nvme_tcp_try_recv(queue);
+	return queue->nr_cqe;
+}
+
 static struct blk_mq_ops nvme_tcp_mq_ops = {
 	.queue_rq	= nvme_tcp_queue_rq,
 	.complete	= nvme_complete_rq,
@@ -2158,6 +2195,7 @@ static struct blk_mq_ops nvme_tcp_mq_ops = {
 	.init_hctx	= nvme_tcp_init_hctx,
 	.timeout	= nvme_tcp_timeout,
 	.map_queues	= nvme_tcp_map_queues,
+	.poll		= nvme_tcp_poll,
 };
 
 static struct blk_mq_ops nvme_tcp_admin_mq_ops = {
@@ -2211,7 +2249,8 @@ static struct nvme_ctrl *nvme_tcp_create_ctrl(struct device *dev,
 
 	INIT_LIST_HEAD(&ctrl->list);
 	ctrl->ctrl.opts = opts;
-	ctrl->ctrl.queue_count = opts->nr_io_queues + opts->nr_write_queues + 1;
+	ctrl->ctrl.queue_count = opts->nr_io_queues + opts->nr_write_queues +
+				opts->nr_poll_queues + 1;
 	ctrl->ctrl.sqsize = opts->queue_size - 1;
 	ctrl->ctrl.kato = opts->kato;
 
@@ -2305,7 +2344,7 @@ static struct nvmf_transport_ops nvme_tcp_transport = {
 	.allowed_opts	= NVMF_OPT_TRSVCID | NVMF_OPT_RECONNECT_DELAY |
 			  NVMF_OPT_HOST_TRADDR | NVMF_OPT_CTRL_LOSS_TMO |
 			  NVMF_OPT_HDR_DIGEST | NVMF_OPT_DATA_DIGEST |
-			  NVMF_OPT_NR_WRITE_QUEUES,
+			  NVMF_OPT_NR_WRITE_QUEUES | NVMF_OPT_NR_POLL_QUEUES,
 	.create_ctrl	= nvme_tcp_create_ctrl,
 };
 
-- 
2.16.4