[PATCH net-next v4 0/3] Introduce IPPROTO_SMC

D. Wythe
2024-05-29T03:59:14Z

From: "D. Wythe" <alibuda@linux.alibaba.com>

This patch allows to create smc socket via AF_INET,
similar to the following code,

/* create v4 smc sock */
v4 = socket(AF_INET, SOCK_STREAM, IPPROTO_SMC);

/* create v6 smc sock */
v6 = socket(AF_INET6, SOCK_STREAM, IPPROTO_SMC);

There are several reasons why we believe it is appropriate here:

1. For smc sockets, it actually use IPv4 (AF-INET) or IPv6 (AF-INET6)
address. There is no AF_SMC address at all.

2. Create smc socket in the AF_INET(6) path, which allows us to reuse
the infrastructure of AF_INET(6) path, such as common ebpf hooks.
Otherwise, smc have to implement it again in AF_SMC path. Such as:
1. Replace IPPROTO_TCP with IPPROTO_SMC in the socket() syscall
initiated by the user, without the use of LD-PRELOAD.
2. Select whether immediate fallback is required based on peer's port/ip
before connect().

A very significant result is that we can now use eBPF to implement smc_run
instead of LD_PRELOAD, who is completely ineffective in scenarios of static
linking.

Another potential value is that we are attempting to optimize the
performance of fallback socks, where merging socks is an important part,
and it relies on the creation of SMC sockets under the AF_INET path.
(More information :
https://lore.kernel.org/netdev/1699442703-25015-1-git-send-email-alibuda@linux.alibaba.com/T/)

v2 -> v1 :

- Code formatting, mainly including alignment and annotation repair.
- move inet_smc proto ops to inet_smc.c, avoiding af_smc.c becoming too bulky.
- Fix the issue where refactoring affects the initialization order.
- Fix compile warning (unused out_inet_prot) while CONFIG_IPV6 was not set.

v3 -> v2 :

- Add Alibaba's copyright information to the newfile

v4 -> v3 :

- Fix some spelling errors
- Align function naming style with smc_sock_init() to smc_sk_init()
- Reversing the order of the conditional checks on clcsock to make the code more intuitive

D. Wythe (3):
net/smc: refactoring initialization of smc sock
net/smc: expose smc proto operations
net/smc: Introduce IPPROTO_SMC

include/uapi/linux/in.h | 2 +
net/smc/Makefile | 2 +-
net/smc/af_smc.c | 182 ++++++++++++++++++++++++++++++------------------
net/smc/inet_smc.c | 108 ++++++++++++++++++++++++++++
net/smc/inet_smc.h | 34 +++++++++
net/smc/smc.h | 38 ++++++++++
6 files changed, 297 insertions(+), 69 deletions(-)
create mode 100644 net/smc/inet_smc.c
create mode 100644 net/smc/inet_smc.h

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1.8.3.1