diff options
| author | Bobby Eshleman <bobbyeshleman@meta.com> | 2026-05-14 10:22:28 -0700 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2026-05-18 18:49:06 -0700 |
| commit | 7d3ab852dcd853692197a830d20052127754a087 (patch) | |
| tree | 509f4b05e703c532567548bfe4fe95417ec3e9e8 /include/linux | |
| parent | f79a0466a46f81e5b42458fcbec033280c841293 (diff) | |
net: convert netmem_tx flag to enum
Devices that support netmem TX previously set dev->netmem_tx = true.
This was checked in validate_xmit_unreadable_skb() to drop unreadable
skbs (skbs with dmabuf-backed frags) before they reach drivers that
would mishandle them or devices that would not have the iommu mappings
for them.
A subsequent patch will introduce a third state for virtual devices
that forward unreadable skbs without ever performing DMA on them. To
prepare for that, convert the boolean dev->netmem_tx into an enum:
NETMEM_TX_NONE - no netmem TX support (drop unreadable skbs)
NETMEM_TX_DMA - full support, device does DMA
Update the existing NIC drivers (bnxt, gve, mlx5, fbnic) and the
validators in net/core to use the new enum. No functional change.
Acked-by: Harshitha Ramamurthy <hramamurthy@google.com>
Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Signed-off-by: Bobby Eshleman <bobbyeshleman@meta.com>
Link: https://patch.msgid.link/20260514-tcp-dm-netkit-v5-1-408c59b91e66@meta.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/netdevice.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index e7af71491a47..b7a4503f7cdb 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -1794,6 +1794,11 @@ enum netdev_stat_type { NETDEV_PCPU_STAT_DSTATS, /* struct pcpu_dstats */ }; +enum netmem_tx_mode { + NETMEM_TX_NONE, /* no netmem TX support */ + NETMEM_TX_DMA, /* DMA-capable netmem TX (real HW) */ +}; + enum netdev_reg_state { NETREG_UNINITIALIZED = 0, NETREG_REGISTERED, /* completed register_netdevice */ @@ -1815,7 +1820,7 @@ 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. + * @netmem_tx: device netmem TX mode * * @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 |