netdev - [PATCH 1/2] rtnetlink: allow GSO maximums to be passed to device

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Date:   Tue,  5 Dec 2017 17:14:25 -0800
From:   Solio Sarabia <solio.sarabia@...el.com>
To:     netdev@...r.kernel.org, davem@...emloft.net,
        stephen@...workplumber.org
Cc:     eric.dumazet@...il.com, dsahern@...il.com, kys@...rosoft.com,
        shiny.sebastian@...el.com, solio.sarabia@...el.com,
        Stephen Hemminger <sthemmin@...rosoft.com>
Subject: [PATCH 1/2] rtnetlink: allow GSO maximums to be passed to device

From: Stephen Hemminger <stephen@...workplumber.org>

Allow GSO maximum segments and size as netlink parameters on input,
with 'ip link add' utils for example. Allow also updating these
attributes after rtnetlink devices are created.

Signed-off-by: Stephen Hemminger <sthemmin@...rosoft.com>
Signed-off-by: Solio Sarabia <solio.sarabia@...el.com>
---
 net/core/rtnetlink.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index a4faefd..a1ff2a8 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -1637,6 +1637,8 @@ static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
 	[IFLA_PROMISCUITY]	= { .type = NLA_U32 },
 	[IFLA_NUM_TX_QUEUES]	= { .type = NLA_U32 },
 	[IFLA_NUM_RX_QUEUES]	= { .type = NLA_U32 },
+	[IFLA_GSO_MAX_SEGS]	= { .type = NLA_U32 },
+	[IFLA_GSO_MAX_SIZE]	= { .type = NLA_U32 },
 	[IFLA_PHYS_PORT_ID]	= { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
 	[IFLA_CARRIER_CHANGES]	= { .type = NLA_U32 },  /* ignored */
 	[IFLA_PHYS_SWITCH_ID]	= { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
@@ -2287,6 +2289,34 @@ static int do_setlink(const struct sk_buff *skb,
 		}
 	}
 
+	if (tb[IFLA_GSO_MAX_SIZE]) {
+		u32 max_size = nla_get_u32(tb[IFLA_GSO_MAX_SIZE]);
+
+		if (max_size > GSO_MAX_SIZE) {
+			err = -EINVAL;
+			goto errout;
+		}
+
+		if (dev->gso_max_size ^ max_size) {
+			netif_set_gso_max_size(dev, max_size);
+			status |= DO_SETLINK_MODIFIED;
+		}
+	}
+
+	if (tb[IFLA_GSO_MAX_SEGS]) {
+		u32 max_segs = nla_get_u32(tb[IFLA_GSO_MAX_SEGS]);
+
+		if (max_segs > GSO_MAX_SEGS) {
+			err = -EINVAL;
+			goto errout;
+		}
+
+		if (dev->gso_max_segs ^ max_segs) {
+			dev->gso_max_segs = max_segs;
+			status |= DO_SETLINK_MODIFIED;
+		}
+	}
+
 	if (tb[IFLA_OPERSTATE])
 		set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
 
-- 
2.7.4