netdev - [RFC PATCH v3 net-next 3/4] bpf: Add SO

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Date:   Mon,  6 Dec 2021 22:11:10 +0300
From:   Akhmat Karakotov <hmukos@...dex-team.ru>
To:     netdev@...r.kernel.org
Cc:     hmukos@...dex-team.ru, edumazet@...gle.com, eric.dumazet@...il.com,
        mitradir@...dex-team.ru, tom@...bertland.com, zeil@...dex-team.ru
Subject: [RFC PATCH v3 net-next 3/4] bpf: Add SO_TXREHASH setsockopt

Add bpf socket option to override rehash behaviour from userspace or from bpf.

Signed-off-by: Akhmat Karakotov <hmukos@...dex-team.ru>
---
 net/core/filter.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/net/core/filter.c b/net/core/filter.c
index 2e32cee2c469..de68763f3c51 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -4808,6 +4808,13 @@ static int _bpf_setsockopt(struct sock *sk, int level, int optname,
 		case SO_REUSEPORT:
 			sk->sk_reuseport = valbool;
 			break;
+		case SO_TXREHASH:
+			if (val < -1 || val > 1) {
+				ret = -EINVAL;
+				break;
+			}
+			sk->sk_txrehash = (u8)val;
+			break;
 		default:
 			ret = -EINVAL;
 		}
@@ -4980,6 +4987,9 @@ static int _bpf_getsockopt(struct sock *sk, int level, int optname,
 		case SO_REUSEPORT:
 			*((int *)optval) = sk->sk_reuseport;
 			break;
+		case SO_TXREHASH:
+			*((int *)optval) = sk->sk_txrehash;
+			break;
 		default:
 			goto err_clear;
 		}
-- 
2.17.1