netdev - [PATCH net-next v5 4/5] bpf: Add SO

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Date:   Mon, 31 Jan 2022 16:31:24 +0300
From:   Akhmat Karakotov <hmukos@...dex-team.ru>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, edumazet@...gle.com,
        eric.dumazet@...il.com, bpf@...r.kernel.org, ast@...nel.org,
        daniel@...earbox.net, andrii@...nel.org, tom@...bertland.com,
        hmukos@...dex-team.ru, zeil@...dex-team.ru, mitradir@...dex-team.ru
Subject: [PATCH net-next v5 4/5] 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>
Reviewed-by: Eric Dumazet <edumazet@...gle.com>
---
 net/core/filter.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/net/core/filter.c b/net/core/filter.c
index a06931c27eeb..9615ae1ab530 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -5091,6 +5091,13 @@ 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;
 		}
@@ -5269,6 +5276,9 @@ 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