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Message-ID: <c335bd6860c2e341de6eac18a477425a7c7cdb3f.1718862050.git.ecree.xilinx@gmail.com>
Date: Thu, 20 Jun 2024 06:47:05 +0100
From: <edward.cree@....com>
To: <linux-net-drivers@....com>, <davem@...emloft.net>, <kuba@...nel.org>,
<edumazet@...gle.com>, <pabeni@...hat.com>
CC: Edward Cree <ecree.xilinx@...il.com>, <netdev@...r.kernel.org>,
<habetsm.xilinx@...il.com>, <sudheer.mogilappagari@...el.com>,
<jdamato@...tly.com>, <mw@...ihalf.com>, <linux@...linux.org.uk>,
<sgoutham@...vell.com>, <gakula@...vell.com>, <sbhatta@...vell.com>,
<hkelam@...vell.com>, <saeedm@...dia.com>, <leon@...nel.org>,
<jacob.e.keller@...el.com>, <andrew@...n.ch>, <ahmed.zaki@...el.com>
Subject: [PATCH v6 net-next 2/9] net: ethtool: attach an XArray of custom RSS contexts to a netdevice
From: Edward Cree <ecree.xilinx@...il.com>
Each context stores the RXFH settings (indir, key, and hfunc) as well
as optionally some driver private data.
Delete any still-existing contexts at netdev unregister time.
Signed-off-by: Edward Cree <ecree.xilinx@...il.com>
---
include/linux/ethtool.h | 42 +++++++++++++++++++++++++++++++++++++++++
net/core/dev.c | 27 ++++++++++++++++++++++++++
2 files changed, 69 insertions(+)
diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
index 8cd6b3c993f1..13c9c819de58 100644
--- a/include/linux/ethtool.h
+++ b/include/linux/ethtool.h
@@ -159,6 +159,46 @@ static inline u32 ethtool_rxfh_indir_default(u32 index, u32 n_rx_rings)
return index % n_rx_rings;
}
+/**
+ * struct ethtool_rxfh_context - a custom RSS context configuration
+ * @indir_size: Number of u32 entries in indirection table
+ * @key_size: Size of hash key, in bytes
+ * @priv_size: Size of driver private data, in bytes
+ * @hfunc: RSS hash function identifier. One of the %ETH_RSS_HASH_*
+ * @input_xfrm: Defines how the input data is transformed. Valid values are one
+ * of %RXH_XFRM_*.
+ * @indir_configured: indir has been specified (at create time or subsequently)
+ * @key_configured: hkey has been specified (at create time or subsequently)
+ */
+struct ethtool_rxfh_context {
+ u32 indir_size;
+ u32 key_size;
+ u16 priv_size;
+ u8 hfunc;
+ u8 input_xfrm;
+ u8 indir_configured:1;
+ u8 key_configured:1;
+ /* private: driver private data, indirection table, and hash key are
+ * stored sequentially in @data area. Use below helpers to access.
+ */
+ u8 data[] __aligned(sizeof(void *));
+};
+
+static inline void *ethtool_rxfh_context_priv(struct ethtool_rxfh_context *ctx)
+{
+ return ctx->data;
+}
+
+static inline u32 *ethtool_rxfh_context_indir(struct ethtool_rxfh_context *ctx)
+{
+ return (u32 *)(ctx->data + ALIGN(ctx->priv_size, sizeof(u32)));
+}
+
+static inline u8 *ethtool_rxfh_context_key(struct ethtool_rxfh_context *ctx)
+{
+ return (u8 *)(ethtool_rxfh_context_indir(ctx) + ctx->indir_size);
+}
+
/* declare a link mode bitmap */
#define __ETHTOOL_DECLARE_LINK_MODE_MASK(name) \
DECLARE_BITMAP(name, __ETHTOOL_LINK_MODE_MASK_NBITS)
@@ -1000,9 +1040,11 @@ int ethtool_virtdev_set_link_ksettings(struct net_device *dev,
/**
* struct ethtool_netdev_state - per-netdevice state for ethtool features
+ * @rss_ctx: XArray of custom RSS contexts
* @wol_enabled: Wake-on-LAN is enabled
*/
struct ethtool_netdev_state {
+ struct xarray rss_ctx;
unsigned wol_enabled:1;
};
diff --git a/net/core/dev.c b/net/core/dev.c
index 29351bbea803..78465b69dc68 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -10285,6 +10285,9 @@ int register_netdevice(struct net_device *dev)
if (ret)
return ret;
+ /* rss ctx ID 0 is reserved for the default context, start from 1 */
+ xa_init_flags(&dev->ethtool->rss_ctx, XA_FLAGS_ALLOC1);
+
spin_lock_init(&dev->addr_list_lock);
netdev_set_addr_lockdep_class(dev);
@@ -11184,6 +11187,28 @@ void synchronize_net(void)
}
EXPORT_SYMBOL(synchronize_net);
+static void netdev_rss_contexts_free(struct net_device *dev)
+{
+ struct ethtool_rxfh_context *ctx;
+ unsigned long context;
+
+ xa_for_each(&dev->ethtool->rss_ctx, context, ctx) {
+ struct ethtool_rxfh_param rxfh;
+
+ rxfh.indir = ethtool_rxfh_context_indir(ctx);
+ rxfh.key = ethtool_rxfh_context_key(ctx);
+ rxfh.hfunc = ctx->hfunc;
+ rxfh.input_xfrm = ctx->input_xfrm;
+ rxfh.rss_context = context;
+ rxfh.rss_delete = true;
+
+ xa_erase(&dev->ethtool->rss_ctx, context);
+ dev->ethtool_ops->set_rxfh(dev, &rxfh, NULL);
+ kfree(ctx);
+ }
+ xa_destroy(&dev->ethtool->rss_ctx);
+}
+
/**
* unregister_netdevice_queue - remove device from the kernel
* @dev: device
@@ -11287,6 +11312,8 @@ void unregister_netdevice_many_notify(struct list_head *head,
netdev_name_node_alt_flush(dev);
netdev_name_node_free(dev->name_node);
+ netdev_rss_contexts_free(dev);
+
call_netdevice_notifiers(NETDEV_PRE_UNINIT, dev);
if (dev->netdev_ops->ndo_uninit)
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