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authorThomas Falcon <tlfalcon@linux.vnet.ibm.com>2016-12-08 16:40:03 -0600
committerDavid S. Miller <davem@davemloft.net>2016-12-09 22:47:22 -0500
commit7b5967389f5a8dfb9d32843830f5e2717e20995d (patch)
treec87b44a7b13809b0db95357639f25a47e5ac8707 /drivers/net/ethernet/smsc
parent1472d599a8d30429bf322fdc53bae3bec382308d (diff)
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ibmveth: set correct gso_size and gso_type
This patch is based on an earlier one submitted by Jon Maxwell with the following commit message: "We recently encountered a bug where a few customers using ibmveth on the same LPAR hit an issue where a TCP session hung when large receive was enabled. Closer analysis revealed that the session was stuck because the one side was advertising a zero window repeatedly. We narrowed this down to the fact the ibmveth driver did not set gso_size which is translated by TCP into the MSS later up the stack. The MSS is used to calculate the TCP window size and as that was abnormally large, it was calculating a zero window, even although the sockets receive buffer was completely empty." We rely on the Virtual I/O Server partition in a pseries environment to provide the MSS through the TCP header checksum field. The stipulation is that users should not disable checksum offloading if rx packet aggregation is enabled through VIOS. Some firmware offerings provide the MSS in the RX buffer. This is signalled by a bit in the RX queue descriptor. Reviewed-by: Brian King <brking@linux.vnet.ibm.com> Reviewed-by: Pradeep Satyanarayana <pradeeps@linux.vnet.ibm.com> Reviewed-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Reviewed-by: Jonathan Maxwell <jmaxwell37@gmail.com> Reviewed-by: David Dai <zdai@us.ibm.com> Signed-off-by: Thomas Falcon <tlfalcon@linux.vnet.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/smsc')
0 files changed, 0 insertions, 0 deletions
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