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vtnet: Support jumbo frames without TSO/GSO

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Currently in Virtio driver without TSO/GSO features enabled, the max scatter
gather segments for the TX path can be 4, which limits the support for 9K JUMBO
frames. 9K JUMBO frames results in more than 4 scatter gather segments and
virtio driver fails to send the frame down to host OS. With TSO/GSO feature
enabled max scatter gather segments can be 64, then 9K JUMBO frames are fine,
this is making virtio driver to support JUMBO frames only with TSO/GSO.

Increasing the VTNET_MIN_TX_SEGS which is the case for non TSO/GSO to 32 to
support upto 64K JUMBO frames to Host.

Submitted by:	Lohith Bellad <lohithbsd@gmail.com>
Reviewed by:	adrian
Differential Revision:	https://reviews.freebsd.org/D8803
This commit is contained in:
kp 2017-07-29 09:22:48 +00:00
parent c71eb5ab1f
commit 93f7d03418
1 changed files with 1 additions and 1 deletions
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2
sys/dev/virtio/network/if_vtnetvar.h
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@ -314,7 +314,7 @@ CTASSERT(sizeof(struct vtnet_mac_filter) <= PAGE_SIZE);
#define VTNET_MRG_RX_SEGS 1
#define VTNET_MIN_RX_SEGS 2
#define VTNET_MAX_RX_SEGS 34
#define VTNET_MIN_TX_SEGS 4
#define VTNET_MIN_TX_SEGS 32
#define VTNET_MAX_TX_SEGS 64
/*