netdev - [PATCH v12 11/26] nvme-tcp: Add modparam to control the ULP offload enablement

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Message-Id: <20230712161513.134860-12-aaptel@nvidia.com>
Date: Wed, 12 Jul 2023 16:14:58 +0000
From: Aurelien Aptel <aaptel@...dia.com>
To: linux-nvme@...ts.infradead.org,
	netdev@...r.kernel.org,
	sagi@...mberg.me,
	hch@....de,
	kbusch@...nel.org,
	axboe@...com,
	chaitanyak@...dia.com,
	davem@...emloft.net,
	kuba@...nel.org
Cc: Aurelien Aptel <aaptel@...dia.com>,
	aurelien.aptel@...il.com,
	smalin@...dia.com,
	malin1024@...il.com,
	ogerlitz@...dia.com,
	yorayz@...dia.com,
	borisp@...dia.com,
	galshalom@...dia.com,
	mgurtovoy@...dia.com
Subject: [PATCH v12 11/26] nvme-tcp: Add modparam to control the ULP offload enablement

Add ulp_offload module parameter to the nvme-tcp module to control
ULP offload at the NVMe-TCP layer.

Turn ULP offload off be default, regardless of the NIC driver support.

Overall, in order to enable ULP offload:
- nvme-tcp ulp_offload modparam must be set to 1
- netdev->ulp_ddp_caps.active must have ULP_DDP_C_NVME_TCP and/or
  ULP_DDP_C_NVME_TCP_DDGST_RX capabilities flag set.

Signed-off-by: Yoray Zack <yorayz@...dia.com>
Signed-off-by: Shai Malin <smalin@...dia.com>
Signed-off-by: Aurelien Aptel <aaptel@...dia.com>
---
 drivers/nvme/host/tcp.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c
index e68e5da3df76..e560bdf3a023 100644
--- a/drivers/nvme/host/tcp.c
+++ b/drivers/nvme/host/tcp.c
@@ -49,6 +49,16 @@ MODULE_PARM_DESC(tls_handshake_timeout,
 		 "nvme TLS handshake timeout in seconds (default 10)");
 #endif
 
+#ifdef CONFIG_ULP_DDP
+/* NVMeTCP direct data placement and data digest offload will not
+ * happen if this parameter false (default), regardless of what the
+ * underlying netdev capabilities are.
+ */
+static bool ulp_offload;
+module_param(ulp_offload, bool, 0644);
+MODULE_PARM_DESC(ulp_offload, "Enable or disable NVMeTCP ULP support");
+#endif
+
 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 /* lockdep can detect a circular dependency of the form
  *   sk_lock -> mmap_lock (page fault) -> fs locks -> sk_lock
@@ -350,7 +360,7 @@ static bool nvme_tcp_ddp_query_limits(struct net_device *netdev,
 static inline bool is_netdev_ulp_offload_active(struct net_device *netdev,
 						struct nvme_tcp_queue *queue)
 {
-	if (!netdev || !queue)
+	if (!ulp_offload || !netdev || !queue)
 		return false;
 
 	/* If we cannot query the netdev limitations, do not offload */
-- 
2.34.1