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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 Signed-off-by: Shai Malin Signed-off-by: Aurelien Aptel --- 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 52e0db53d067..1ce9de41a2f5 100644 --- a/drivers/nvme/host/tcp.c +++ b/drivers/nvme/host/tcp.c @@ -34,6 +34,16 @@ 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 @@ -315,6 +325,9 @@ 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->ulp_ddp_limits) return false; @@ -453,6 +466,9 @@ 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 = queue->hdr_digest ? NVME_TCP_HDR_DIGEST_ENABLE : 0; @@ -504,6 +520,9 @@ static void nvme_tcp_offload_limits(struct nvme_tcp_queue *queue, struct net_dev { 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