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Commit 1bbcb569 authored by Ravinder Konka's avatar Ravinder Konka Committed by Gerrit - the friendly Code Review server
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rmnet_data : Changes to support Scatter Gather and GSO. 



This patch enables hardware device features such as
NETIF_F_SG NETIF_F_GSO NETIF_F_GSO_UDP_TUNNEL
NETIF_F_GSO_UDP_TUNNEL_CSUM. This patch also ensures
to skip padding(to align length to word boundaries)
for outgoing  non linear skbs.

This patch also adds a new ioctl interface
RMNET_IOCTL_GET_SG_SUPPORT  to query the physical
 network devices for Scatter Gather support.

Change-Id: I9788d75c249ab2dac5b598dad131c0692ed84e4d
Acked-by: default avatarAbhishek Chauhan <abchauha@qti.qualcomm.com>
Signed-off-by: default avatarRavinder Konka <rkonka@codeaurora.org>
parent c2752cc0

include/uapi/linux/msm_rmnet.h

+2 −1
Original line number Diff line number Diff line
@@ -59,7 +59,8 @@ enum rmnet_ioctl_extended_cmds_e { 
	RMNET_IOCTL_SET_SLEEP_STATE            = 0x0014,   /* Set sleep state */

	RMNET_IOCTL_SET_XLAT_DEV_INFO          = 0x0015,   /* xlat dev name   */

	RMNET_IOCTL_DEREGISTER_DEV             = 0x0016,   /* Dereg a net dev */

	RMNET_IOCTL_EXTENDED_MAX               = 0x0017

	RMNET_IOCTL_GET_SG_SUPPORT             = 0x0017,   /* Query sg support*/

	RMNET_IOCTL_EXTENDED_MAX               = 0x0018

};



/* Return values for the RMNET_IOCTL_GET_SUPPORTED_FEATURES IOCTL */

net/rmnet_data/rmnet_data_vnd.c

+6 −0
Original line number Diff line number Diff line
@@ -615,6 +615,12 @@ int rmnet_vnd_create_dev(int id, struct net_device **new_device, 
			NETIF_F_IPV6_UDP_CSUM;

		/* Configuring GRO on rmnet_data interfaces */

		dev->hw_features |= NETIF_F_GRO;

		/* Configuring Scatter-Gather on rmnet_data interfaces */

		dev->hw_features |= NETIF_F_SG;

		/* Configuring GSO on rmnet_data interfaces */

		dev->hw_features |= NETIF_F_GSO;

		dev->hw_features |= NETIF_F_GSO_UDP_TUNNEL;

		dev->hw_features |= NETIF_F_GSO_UDP_TUNNEL_CSUM;

	}



	rc = register_netdevice(dev);

net/rmnet_data/rmnet_map_data.c

+10 −0
Original line number Diff line number Diff line
@@ -99,6 +99,15 @@ struct rmnet_map_header_s *rmnet_map_add_map_header(struct sk_buff *skb, 


	padding = ALIGN(map_datalen, 4) - map_datalen;



	if (padding == 0)

		goto done;



	if ((skb->dev->features & NETIF_F_GSO) &&

	    skb_is_nonlinear(skb) && unlikely((padding != 0))) {

		LOGE("pad:%d required for non linear skb", padding);

		BUG();

	}



	if (skb_tailroom(skb) < padding)

		return 0;
@@ -106,6 +115,7 @@ struct rmnet_map_header_s *rmnet_map_add_map_header(struct sk_buff *skb, 
	LOGD("pad: %d", padding);

	memset(padbytes, 0, padding);



done:

	map_header->pkt_len = htons(map_datalen + padding);

	map_header->pad_len = padding&0x3F;