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net: ethtool: attach an XArray of custom RSS contexts to a netdevice

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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@gmail.com>
Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Link: https://patch.msgid.link/cbd1c402cec38f2e03124f2ab65b4ae4e08bd90d.1719502240.git.ecree.xilinx@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Edward Cree 2024-06-27 16:33:47 +01:00 committed by Jakub Kicinski
parent 3ebbd9f6de
commit 6ad2962f8a
2 changed files with 69 additions and 0 deletions
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42
include/linux/ethtool.h
View File

@ -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)
@ -1006,9 +1046,11 @@ 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;
};

27
net/core/dev.c
View File

@ -10336,6 +10336,9 @@ 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);
@ -11235,6 +11238,28 @@ 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
@ -11338,6 +11363,8 @@ 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)