Commit a08a5c94 authored by Taehee Yoo's avatar Taehee Yoo Committed by Jakub Kicinski
Browse files

net: devmem: add ring parameter filtering 



If driver doesn't support ring parameter or tcp-data-split configuration
is not sufficient, the devmem should not be set up.
Before setup the devmem, tcp-data-split should be ON and hds-thresh
value should be 0.

Tested-by: default avatarStanislav Fomichev <sdf@fomichev.me>
Reviewed-by: default avatarMina Almasry <almasrymina@google.com>
Signed-off-by: default avatarTaehee Yoo <ap420073@gmail.com>
Link: https://patch.msgid.link/20250114142852.3364986-4-ap420073@gmail.com


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent eec8359f

net/core/devmem.c

+11 −0
Original line number Diff line number Diff line
@@ -8,6 +8,7 @@ 
 */



#include <linux/dma-buf.h>

#include <linux/ethtool_netlink.h>

#include <linux/genalloc.h>

#include <linux/mm.h>

#include <linux/netdevice.h>
@@ -140,6 +141,16 @@ int net_devmem_bind_dmabuf_to_queue(struct net_device *dev, u32 rxq_idx, 
		return -ERANGE;

	}



	if (dev->ethtool->hds_config != ETHTOOL_TCP_DATA_SPLIT_ENABLED) {

		NL_SET_ERR_MSG(extack, "tcp-data-split is disabled");

		return -EINVAL;

	}



	if (dev->ethtool->hds_thresh) {

		NL_SET_ERR_MSG(extack, "hds-thresh is not zero");

		return -EINVAL;

	}



	rxq = __netif_get_rx_queue(dev, rxq_idx);

	if (rxq->mp_params.mp_priv) {

		NL_SET_ERR_MSG(extack, "designated queue already memory provider bound");