Changes from v1: - unified skb_copy_datagram_iter and skb_copy_and_csum_datagram (and the new skb_hash_and_copy_datagram_iter) to a single code path - removed nvmet modparam budgets (made them a define set to their default values) - fixed nvme-tcp host chained r2t transfers reported off-list - made .install_queue callout return nvme status code - Added some review tags - rebased on top of nvme-4.21 branch (nvme tree) + sqflow disable patches This patch set implements the NVMe over Fabrics TCP host and the target drivers. Now NVMe over Fabrics can run on every Ethernet port in the world. The implementation conforms to NVMe over Fabrics 1.1 specification (which will include already publicly available NVMe/TCP transport binding, TP 8000). The host driver hooks into the NVMe host stack and implements the TCP transport binding for NVMe over Fabrics. The NVMe over Fabrics TCP host driver is responsible for establishing a NVMe/TCP connection, TCP event and error handling and data-plane messaging and stream processing. The target driver hooks into the NVMe target core stack and implements the TCP transport binding. The NVMe over Fabrics target driver is responsible for accepting and establishing NVMe/TCP connections, TCP event and error handling, and data-plane messaging and stream processing. The implementation of both the host and target are fairly simple and straight-forward. Every NVMe queue is backed by a TCP socket that provides us reliable, in-order delivery of fabrics capsules and/or data. All NVMe queues are sharded over a private bound workqueue such that we always have a single context handling the byte stream and we don't need to worry about any locking/serialization. In addition, close attention was paid to a completely non-blocking data plane to minimize context switching and/or unforced scheduling. I piggybacked nvme-cli patches to the set for completeness. Also, @netdev mailing list is cc'd as this patch set contains generic helpers for online digest calculation (patches 1-3). The patchset structure: - patches 1-6 are prep to add a helper for digest calculation online with data placement - patches 7-11 are preparatory patches for NVMe/TCP - patches 12-14 implements NVMe/TCP - patches 15-17 are nvme-cli additions for NVMe/TCP Thanks to the members of the Fabrics Linux Driver team that helped development, testing and benchmarking this work. Gitweb code is available at: git://git.infradead.org/nvme.git nvme-tcp Sagi Grimberg (14): ath6kl: add ath6kl_ prefix to crypto_type datagram: open-code copy_page_to_iter iov_iter: pass void csum pointer to csum_and_copy_to_iter net/datagram: consolidate datagram copy to iter helpers iov_iter: introduce hash_and_copy_to_iter helper datagram: introduce skb_copy_and_hash_datagram_iter helper nvme-core: add work elements to struct nvme_ctrl nvmet: Add install_queue callout nvmet: allow configfs tcp trtype configuration nvme-fabrics: allow user passing header digest nvme-fabrics: allow user passing data digest nvme-tcp: Add protocol header nvmet-tcp: add NVMe over TCP target driver nvme-tcp: add NVMe over TCP host driver drivers/net/wireless/ath/ath6kl/cfg80211.c | 2 +- drivers/net/wireless/ath/ath6kl/common.h | 2 +- drivers/net/wireless/ath/ath6kl/wmi.c | 6 +- drivers/net/wireless/ath/ath6kl/wmi.h | 6 +- drivers/nvme/host/Kconfig | 15 + drivers/nvme/host/Makefile | 3 + drivers/nvme/host/fabrics.c | 10 + drivers/nvme/host/fabrics.h | 4 + drivers/nvme/host/fc.c | 18 +- drivers/nvme/host/nvme.h | 2 + drivers/nvme/host/rdma.c | 19 +- drivers/nvme/host/tcp.c | 2306 ++++++++++++++++++++ drivers/nvme/target/Kconfig | 10 + drivers/nvme/target/Makefile | 2 + drivers/nvme/target/configfs.c | 1 + drivers/nvme/target/fabrics-cmd.c | 9 + drivers/nvme/target/nvmet.h | 1 + drivers/nvme/target/tcp.c | 1741 +++++++++++++++ include/linux/nvme-tcp.h | 189 ++ include/linux/nvme.h | 1 + include/linux/skbuff.h | 3 + include/linux/uio.h | 5 +- lib/iov_iter.c | 19 +- net/core/datagram.c | 158 +- 24 files changed, 4406 insertions(+), 126 deletions(-) create mode 100644 drivers/nvme/host/tcp.c create mode 100644 drivers/nvme/target/tcp.c create mode 100644 include/linux/nvme-tcp.h -- 2.17.1
