[PATCH v11 11/25] nvme-tcp: Add modparam to control the ULP offload enablement
From: Aurelien Aptel <hidden>
Date: 2023-02-03 13:30:48
Also in:
linux-nvme
Subsystem:
nvm express driver, the rest · Maintainers:
Keith Busch, Jens Axboe, Christoph Hellwig, Sagi Grimberg, Linus Torvalds
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 <redacted> Signed-off-by: Shai Malin <redacted> Signed-off-by: Aurelien Aptel <redacted> --- drivers/nvme/host/tcp.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+)
diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c
index 732f7636a6fc..77422f49fc76 100644
--- a/drivers/nvme/host/tcp.c
+++ b/drivers/nvme/host/tcp.c@@ -35,6 +35,16 @@ static int so_priority; module_param(so_priority, int, 0644); MODULE_PARM_DESC(so_priority, "nvme tcp socket optimize priority"); +#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
@@ -317,6 +327,9 @@ static bool nvme_tcp_ddp_query_limits(struct net_device *netdev, { int ret; + if (!ulp_offload) + return false; + if (!netdev || !is_netdev_ulp_offload_active(netdev, NULL) || !netdev->netdev_ops->ulp_ddp_ops->limits) return false;
@@ -456,6 +469,9 @@ static int nvme_tcp_offload_socket(struct nvme_tcp_queue *queue) netdev->ulp_ddp_caps.active); int ret; + if (!ulp_offload) + return 0; + config.nvmeotcp.pfv = NVME_TCP_PFV_1_0; config.nvmeotcp.cpda = 0; config.nvmeotcp.dgst =
@@ -510,6 +526,9 @@ static void nvme_tcp_offload_limits(struct nvme_tcp_queue *queue, { struct ulp_ddp_limits limits = {.type = ULP_DDP_NVME }; + if (!ulp_offload) + return; + if (!nvme_tcp_ddp_query_limits(netdev, &limits)) { queue->ctrl->offloading_netdev = NULL; return;
--
2.31.1