diff options
| author | Jeremy Kerr <jk@codeconstruct.com.au> | 2026-07-24 13:15:27 +0800 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2026-07-30 16:54:59 -0700 |
| commit | 76a58ffd741719eada095e311961539a82c75e71 (patch) | |
| tree | cf35d19e62fc44b4ed0514540d313a7222541d88 /include | |
| parent | aadf5ed03e85736d755162ecbfc4d57d2044be49 (diff) | |
net: mctp: usblib: Add support for multi-packet transmit
The MCTP over USB spec allows us to pack multiple packets in one
transfer. Given the packet max length is 255, and the transfer max
length is 512, we can typically include two full-size packets per
urb submission.
To do this, we allow a struct mctp_usb_tx to persist a tx_ctx,
representing the ongoing context for a transmit. If possible, a TX skb
will be queued to the context and the send deferred until the context is
full, or the device queue reports no more packets.
This typically requires a linear buffer for the 512-byte TX, which we
allocate along with the TX context.
Signed-off-by: Jeremy Kerr <jk@codeconstruct.com.au>
Link: https://patch.msgid.link/20260724-dev-mctp-usb-1-1-v5-6-e66bbba0dbdc@codeconstruct.com.au
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/usb/mctp-usb.h | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/include/linux/usb/mctp-usb.h b/include/linux/usb/mctp-usb.h index 76f9d8879254..2e1cde6a6745 100644 --- a/include/linux/usb/mctp-usb.h +++ b/include/linux/usb/mctp-usb.h @@ -58,10 +58,6 @@ void mctp_usblib_rx_cancel(struct mctp_usblib_rx *rx); /* * TX handle: created by mctp_usblib_tx_push() during the tx path, and * may persist across multiple packet transmits. - * - * Currently though, there is a 1:1 mapping between packets and transfers, so - * the tx context will be cleared over each transmit. This will change in - * future. */ struct mctp_usblib_tx_ctx; @@ -76,6 +72,10 @@ struct mctp_usblib_tx_ops { struct mctp_usblib_tx { struct mctp_usblib_tx_ops ops; void *priv; + /* protects access to cur_ctx */ + spinlock_t lock; + /* context to which we are adding packets, cleared on send */ + struct mctp_usblib_tx_ctx *cur_ctx; }; void mctp_usblib_tx_init(struct mctp_usblib_tx *tx, |