diff options
| author | Mina Almasry <almasrymina@google.com> | 2025-05-08 00:48:26 +0000 |
|---|---|---|
| committer | Paolo Abeni <pabeni@redhat.com> | 2025-05-13 11:12:49 +0200 |
| commit | 383faec0fd64b9bff15eb5f700f023ec35520a96 (patch) | |
| tree | 24e5909b0ef72a7d59c7f36ba08a063d28a266cc /include | |
| parent | 17af8cc06a5a302f22994e765ddb7268373ad1db (diff) | |
net: enable driver support for netmem TX
Drivers need to make sure not to pass netmem dma-addrs to the
dma-mapping API in order to support netmem TX.
Add helpers and netmem_dma_*() helpers that enables special handling of
netmem dma-addrs that drivers can use.
Document in netmem.rst what drivers need to do to support netmem TX.
Signed-off-by: Mina Almasry <almasrymina@google.com>
Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Link: https://patch.msgid.link/20250508004830.4100853-7-almasrymina@google.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/netdevice.h | 2 | ||||
| -rw-r--r-- | include/net/netmem.h | 20 |
2 files changed, 22 insertions, 0 deletions
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 773167508c82..32a1e41636a9 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -1772,6 +1772,7 @@ enum netdev_reg_state { * @lltx: device supports lockless Tx. Deprecated for real HW * drivers. Mainly used by logical interfaces, such as * bonding and tunnels + * @netmem_tx: device support netmem_tx. * * @name: This is the first field of the "visible" part of this structure * (i.e. as seen by users in the "Space.c" file). It is the name @@ -2087,6 +2088,7 @@ struct net_device { struct_group(priv_flags_fast, unsigned long priv_flags:32; unsigned long lltx:1; + unsigned long netmem_tx:1; ); const struct net_device_ops *netdev_ops; const struct header_ops *header_ops; diff --git a/include/net/netmem.h b/include/net/netmem.h index ecb6b29c93f6..386164fb9c18 100644 --- a/include/net/netmem.h +++ b/include/net/netmem.h @@ -8,6 +8,7 @@ #ifndef _NET_NETMEM_H #define _NET_NETMEM_H +#include <linux/dma-mapping.h> #include <linux/mm.h> #include <net/net_debug.h> @@ -276,4 +277,23 @@ static inline unsigned long netmem_get_dma_addr(netmem_ref netmem) void get_netmem(netmem_ref netmem); void put_netmem(netmem_ref netmem); +#define netmem_dma_unmap_addr_set(NETMEM, PTR, ADDR_NAME, VAL) \ + do { \ + if (!netmem_is_net_iov(NETMEM)) \ + dma_unmap_addr_set(PTR, ADDR_NAME, VAL); \ + else \ + dma_unmap_addr_set(PTR, ADDR_NAME, 0); \ + } while (0) + +static inline void netmem_dma_unmap_page_attrs(struct device *dev, + dma_addr_t addr, size_t size, + enum dma_data_direction dir, + unsigned long attrs) +{ + if (!addr) + return; + + dma_unmap_page_attrs(dev, addr, size, dir, attrs); +} + #endif /* _NET_NETMEM_H */ |