netdev - [PATCH iproute2-next v4] ss: Shorter display format for TLS zerocopy sendfile

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Date:   Wed, 8 Jun 2022 18:34:45 +0300
From:   Maxim Mikityanskiy <maximmi@...dia.com>
To:     David Ahern <dsahern@...il.com>,
        Stephen Hemminger <stephen@...workplumber.org>
CC:     Tariq Toukan <tariqt@...dia.com>,
        Boris Pismenny <borisp@...dia.com>,
        Maxim Mikityanskiy <maximmi@...dia.com>,
        Jakub Kicinski <kuba@...nel.org>, <netdev@...r.kernel.org>
Subject: [PATCH iproute2-next v4] ss: Shorter display format for TLS zerocopy sendfile

Commit 21c07b45688f ("ss: Show zerocopy sendfile status of TLS
sockets") started displaying the activation status of zerocopy sendfile
on TLS sockets, exposed via sock_diag. This commit makes the format more
compact: the flag's name is shorter and is printed only when the feature
is active, similar to other flag options.

The flag's name is also generalized ("sendfile" -> "tx") to embrace
possible future optimizations, and includes an explicit indication that
the underlying data must not be modified during transfer ("ro").

Signed-off-by: Maxim Mikityanskiy <maximmi@...dia.com>
---
 include/uapi/linux/tls.h | 2 +-
 misc/ss.c                | 5 +++--
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/include/uapi/linux/tls.h b/include/uapi/linux/tls.h
index 83a3cea4..4f868648 100644
--- a/include/uapi/linux/tls.h
+++ b/include/uapi/linux/tls.h
@@ -161,7 +161,7 @@ enum {
 	TLS_INFO_CIPHER,
 	TLS_INFO_TXCONF,
 	TLS_INFO_RXCONF,
-	TLS_INFO_ZC_SENDFILE,
+	TLS_INFO_ZC_RO_TX,
 	__TLS_INFO_MAX,
 };
 #define TLS_INFO_MAX (__TLS_INFO_MAX - 1)
diff --git a/misc/ss.c b/misc/ss.c
index c4434a20..ff985cd8 100644
--- a/misc/ss.c
+++ b/misc/ss.c
@@ -2988,7 +2988,8 @@ static void tcp_tls_conf(const char *name, struct rtattr *attr)
 
 static void tcp_tls_zc_sendfile(struct rtattr *attr)
 {
-	out(" zerocopy_sendfile: %s", attr ? "active" : "inactive");
+	if (attr)
+		out(" zc_ro_tx");
 }
 
 static void mptcp_subflow_info(struct rtattr *tb[])
@@ -3221,7 +3222,7 @@ static void tcp_show_info(const struct nlmsghdr *nlh, struct inet_diag_msg *r,
 			tcp_tls_cipher(tlsinfo[TLS_INFO_CIPHER]);
 			tcp_tls_conf("rxconf", tlsinfo[TLS_INFO_RXCONF]);
 			tcp_tls_conf("txconf", tlsinfo[TLS_INFO_TXCONF]);
-			tcp_tls_zc_sendfile(tlsinfo[TLS_INFO_ZC_SENDFILE]);
+			tcp_tls_zc_sendfile(tlsinfo[TLS_INFO_ZC_RO_TX]);
 		}
 		if (ulpinfo[INET_ULP_INFO_MPTCP]) {
 			struct rtattr *sfinfo[MPTCP_SUBFLOW_ATTR_MAX + 1] =
-- 
2.25.1