Merge branch '40GbE' of git://git.kernel.org/pub/scm/linux/kernel/git/tnguy/next-queue

Tony Nguyen says:

====================
net: intel: start The Great Code Dedup + Page Pool for iavf

Alexander Lobakin says:

Here's a two-shot: introduce {,Intel} Ethernet common library (libeth and
libie) and switch iavf to Page Pool. Details are in the commit messages;
here's a summary:

Not a secret there's a ton of code duplication between two and more Intel
ethernet modules. Before introducing new changes, which would need to be
copied over again, start decoupling the already existing duplicate
functionality into a new module, which will be shared between several
Intel Ethernet drivers. The first name that came to my mind was
"libie" -- "Intel Ethernet common library". Also this sounds like
"lovelie" (-> one word, no "lib I E" pls) and can be expanded as
"lib Internet Explorer" :P
The "generic", pure-software part is placed separately, so that it can be
easily reused in any driver by any vendor without linking to the Intel
pre-200G guts. In a few words, it's something any modern driver does the
same way, but nobody moved it level up (yet).
The series is only the beginning. From now on, adding every new feature
or doing any good driver refactoring will remove much more lines than add
for quite some time. There's a basic roadmap with some deduplications
planned already, not speaking of that touching every line now asks:
"can I share this?". The final destination is very ambitious: have only
one unified driver for at least i40e, ice, iavf, and idpf with a struct
ops for each generation. That's never gonna happen, right? But you still
can at least try.
PP conversion for iavf lands within the same series as these two are tied
closely. libie will support Page Pool model only, so that a driver can't
use much of the lib until it's converted. iavf is only the example, the
rest will eventually be converted soon on a per-driver basis. That is
when it gets really interesting. Stay tech.

* '40GbE' of git://git.kernel.org/pub/scm/linux/kernel/git/tnguy/next-queue:
  MAINTAINERS: add entry for libeth and libie
  iavf: switch to Page Pool
  iavf: pack iavf_ring more efficiently
  libeth: add Rx buffer management
  page_pool: add DMA-sync-for-CPU inline helper
  page_pool: constify some read-only function arguments
  slab: introduce kvmalloc_array_node() and kvcalloc_node()
  iavf: drop page splitting and recycling
  iavf: kill "legacy-rx" for good
  net: intel: introduce {, Intel} Ethernet common library
====================

Link: https://lore.kernel.org/r/20240424203559.3420468-1-anthony.l.nguyen@intel.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 124 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/libie/rx.c b/drivers/net/ethernet/intel/libie/rx.c
new file mode 100644
index 000000000000..38201ee1e891
--- /dev/null
+++ b/drivers/net/ethernet/intel/libie/rx.c
@@ -0,0 +1,124 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright (C) 2024 Intel Corporation */
+
+#include <linux/net/intel/libie/rx.h>
+
+/* O(1) converting i40e/ice/iavf's 8/10-bit hardware packet type to a parsed
+ * bitfield struct.
+ */
+
+/* A few supplementary definitions for when XDP hash types do not coincide
+ * with what can be generated from ptype definitions by means of preprocessor
+ * concatenation.
+ */
+#define XDP_RSS_L3_L2			XDP_RSS_TYPE_NONE
+#define XDP_RSS_L4_NONE			XDP_RSS_TYPE_NONE
+#define XDP_RSS_L4_TIMESYNC		XDP_RSS_TYPE_NONE
+#define XDP_RSS_TYPE_L3			XDP_RSS_TYPE_NONE
+#define XDP_RSS_TYPE_L4			XDP_RSS_L4
+
+#define LIBIE_RX_PT(oip, ofrag, tun, tp, tefr, iprot, pl) {		   \
+		.outer_ip		= LIBETH_RX_PT_OUTER_##oip,	   \
+		.outer_frag		= LIBETH_RX_PT_##ofrag,		   \
+		.tunnel_type		= LIBETH_RX_PT_TUNNEL_IP_##tun,	   \
+		.tunnel_end_prot	= LIBETH_RX_PT_TUNNEL_END_##tp,	   \
+		.tunnel_end_frag	= LIBETH_RX_PT_##tefr,		   \
+		.inner_prot		= LIBETH_RX_PT_INNER_##iprot,	   \
+		.payload_layer		= LIBETH_RX_PT_PAYLOAD_##pl,	   \
+		.hash_type		= XDP_RSS_L3_##oip |		   \
+					  XDP_RSS_L4_##iprot |		   \
+					  XDP_RSS_TYPE_##pl,		   \
+	}
+
+#define LIBIE_RX_PT_UNUSED		{ }
+
+#define __LIBIE_RX_PT_L2(iprot, pl)					   \
+	LIBIE_RX_PT(L2, NOT_FRAG, NONE, NONE, NOT_FRAG, iprot, pl)
+#define LIBIE_RX_PT_L2		__LIBIE_RX_PT_L2(NONE, L2)
+#define LIBIE_RX_PT_TS		__LIBIE_RX_PT_L2(TIMESYNC, L2)
+#define LIBIE_RX_PT_L3		__LIBIE_RX_PT_L2(NONE, L3)
+
+#define LIBIE_RX_PT_IP_FRAG(oip)					   \
+	LIBIE_RX_PT(IPV##oip, FRAG, NONE, NONE, NOT_FRAG, NONE, L3)
+#define LIBIE_RX_PT_IP_L3(oip, tun, teprot, tefr)			   \
+	LIBIE_RX_PT(IPV##oip, NOT_FRAG, tun, teprot, tefr, NONE, L3)
+#define LIBIE_RX_PT_IP_L4(oip, tun, teprot, iprot)			   \
+	LIBIE_RX_PT(IPV##oip, NOT_FRAG, tun, teprot, NOT_FRAG, iprot, L4)
+
+#define LIBIE_RX_PT_IP_NOF(oip, tun, ver)				   \
+	LIBIE_RX_PT_IP_L3(oip, tun, ver, NOT_FRAG),			   \
+	LIBIE_RX_PT_IP_L4(oip, tun, ver, UDP),				   \
+	LIBIE_RX_PT_UNUSED,						   \
+	LIBIE_RX_PT_IP_L4(oip, tun, ver, TCP),				   \
+	LIBIE_RX_PT_IP_L4(oip, tun, ver, SCTP),				   \
+	LIBIE_RX_PT_IP_L4(oip, tun, ver, ICMP)
+
+/* IPv oip --> tun --> IPv ver */
+#define LIBIE_RX_PT_IP_TUN_VER(oip, tun, ver)				   \
+	LIBIE_RX_PT_IP_L3(oip, tun, ver, FRAG),				   \
+	LIBIE_RX_PT_IP_NOF(oip, tun, ver)
+
+/* Non Tunneled IPv oip */
+#define LIBIE_RX_PT_IP_RAW(oip)						   \
+	LIBIE_RX_PT_IP_FRAG(oip),					   \
+	LIBIE_RX_PT_IP_NOF(oip, NONE, NONE)
+
+/* IPv oip --> tun --> { IPv4, IPv6 } */
+#define LIBIE_RX_PT_IP_TUN(oip, tun)					   \
+	LIBIE_RX_PT_IP_TUN_VER(oip, tun, IPV4),				   \
+	LIBIE_RX_PT_IP_TUN_VER(oip, tun, IPV6)
+
+/* IPv oip --> GRE/NAT tun --> { x, IPv4, IPv6 } */
+#define LIBIE_RX_PT_IP_GRE(oip, tun)					   \
+	LIBIE_RX_PT_IP_L3(oip, tun, NONE, NOT_FRAG),			   \
+	LIBIE_RX_PT_IP_TUN(oip, tun)
+
+/* Non Tunneled IPv oip
+ * IPv oip --> { IPv4, IPv6 }
+ * IPv oip --> GRE/NAT --> { x, IPv4, IPv6 }
+ * IPv oip --> GRE/NAT --> MAC --> { x, IPv4, IPv6 }
+ * IPv oip --> GRE/NAT --> MAC/VLAN --> { x, IPv4, IPv6 }
+ */
+#define LIBIE_RX_PT_IP(oip)						   \
+	LIBIE_RX_PT_IP_RAW(oip),					   \
+	LIBIE_RX_PT_IP_TUN(oip, IP),					   \
+	LIBIE_RX_PT_IP_GRE(oip, GRENAT),				   \
+	LIBIE_RX_PT_IP_GRE(oip, GRENAT_MAC),				   \
+	LIBIE_RX_PT_IP_GRE(oip, GRENAT_MAC_VLAN)
+
+/* Lookup table mapping for O(1) parsing */
+const struct libeth_rx_pt libie_rx_pt_lut[LIBIE_RX_PT_NUM] = {
+	/* L2 packet types */
+	LIBIE_RX_PT_UNUSED,
+	LIBIE_RX_PT_L2,
+	LIBIE_RX_PT_TS,
+	LIBIE_RX_PT_L2,
+	LIBIE_RX_PT_UNUSED,
+	LIBIE_RX_PT_UNUSED,
+	LIBIE_RX_PT_L2,
+	LIBIE_RX_PT_L2,
+	LIBIE_RX_PT_UNUSED,
+	LIBIE_RX_PT_UNUSED,
+	LIBIE_RX_PT_L2,
+	LIBIE_RX_PT_UNUSED,
+
+	LIBIE_RX_PT_L3,
+	LIBIE_RX_PT_L3,
+	LIBIE_RX_PT_L3,
+	LIBIE_RX_PT_L3,
+	LIBIE_RX_PT_L3,
+	LIBIE_RX_PT_L3,
+	LIBIE_RX_PT_L3,
+	LIBIE_RX_PT_L3,
+	LIBIE_RX_PT_L3,
+	LIBIE_RX_PT_L3,
+
+	LIBIE_RX_PT_IP(4),
+	LIBIE_RX_PT_IP(6),
+};
+EXPORT_SYMBOL_NS_GPL(libie_rx_pt_lut, LIBIE);
+
+MODULE_AUTHOR("Intel Corporation");
+MODULE_DESCRIPTION("Intel(R) Ethernet common library");
+MODULE_IMPORT_NS(LIBETH);
+MODULE_LICENSE("GPL");