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The maximum TSO frame size should be:

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maximum IP datagram size (65535 bytes) +
	Ethernet header size (14 bytes) +
	2 * VLAN tag size (4 bytes) [1].

[1] We need to multiply by 2 to account for the double VLAN tag
    provision added in IEEE 802.1ad.

Submitted by:	David Somayajulu (david.somayajulu qlogic.com)
MFC after:	4 days
This commit is contained in:
Bjoern A. Zeeb 2011-11-16 02:00:55 +00:00
parent a5e583eea0
commit dcc20f4b7f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=227547
1 changed files with 1 additions and 1 deletions
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2
sys/dev/qlxgb/qla_def.h
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@ -86,7 +86,7 @@ typedef struct qla_tx_buf qla_tx_buf_t;
#define QLA_MAX_SEGMENTS 63 /* maximum # of segs in a sg list */
#define QLA_MAX_FRAME_SIZE MJUM9BYTES
#define QLA_STD_FRAME_SIZE 1514
#define QLA_MAX_TSO_FRAME_SIZE (64 * 1024 - 1)
#define QLA_MAX_TSO_FRAME_SIZE ((64 * 1024 - 1) + 22)
/* Number of MSIX/MSI Vectors required */
#define Q8_MSI_COUNT 4