netdev - [PATCH v2 1/2] net: ethtool: Support setting ntuple rule count

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Date:   Fri, 23 Jul 2021 23:46:45 +0530
From:   Sunil Goutham <sgoutham@...vell.com>
To:     <netdev@...r.kernel.org>, <davem@...emloft.net>, <kuba@...nel.org>
CC:     Sunil Goutham <sgoutham@...vell.com>
Subject: [PATCH v2 1/2] net: ethtool: Support setting ntuple rule count

Some NICs share resources like packet filters across
multiple interfaces they support. From HW point of view
it is possible to use all filters for a single interface.
Currently ethtool doesn't support modifying filter count so
that user can allocate more filters to a interface and less
to others. This patch adds ETHTOOL_SRXCLSRLCNT ioctl command
for modifying filter count.

example command:
./ethtool -U eth0 rule-count 256

Signed-off-by: Sunil Goutham <sgoutham@...vell.com>
---
 include/uapi/linux/ethtool.h | 1 +
 net/ethtool/ioctl.c          | 1 +
 2 files changed, 2 insertions(+)

diff --git a/include/uapi/linux/ethtool.h b/include/uapi/linux/ethtool.h
index 67aa713..178f346 100644
--- a/include/uapi/linux/ethtool.h
+++ b/include/uapi/linux/ethtool.h
@@ -1552,6 +1552,7 @@ enum ethtool_fec_config_bits {
 #define ETHTOOL_PHY_STUNABLE	0x0000004f /* Set PHY tunable configuration */
 #define ETHTOOL_GFECPARAM	0x00000050 /* Get FEC settings */
 #define ETHTOOL_SFECPARAM	0x00000051 /* Set FEC settings */
+#define ETHTOOL_SRXCLSRLCNT	0x00000052 /* Set RX class rule count */
 
 /* compatibility with older code */
 #define SPARC_ETH_GSET		ETHTOOL_GSET
diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c
index 6134b18..ca0f75e 100644
--- a/net/ethtool/ioctl.c
+++ b/net/ethtool/ioctl.c
@@ -2863,6 +2863,7 @@ int dev_ethtool(struct net *net, struct ifreq *ifr)
 	case ETHTOOL_SRXFH:
 	case ETHTOOL_SRXCLSRLDEL:
 	case ETHTOOL_SRXCLSRLINS:
+	case ETHTOOL_SRXCLSRLCNT:
 		rc = ethtool_set_rxnfc(dev, ethcmd, useraddr);
 		break;
 	case ETHTOOL_FLASHDEV:
-- 
2.7.4