linux/drivers/infiniband
Yuval Shaia c42687784b IB/ipoib: Scatter-Gather support in connected mode
By default, IPoIB-CM driver uses 64k MTU. Larger MTU gives better
performance.
This MTU plus overhead puts the memory allocation for IP based packets at
32 4k pages (order 5), which have to be contiguous.
When the system memory under pressure, it was observed that allocating 128k
contiguous physical memory is difficult and causes serious errors (such as
system becomes unusable).

This enhancement resolve the issue by removing the physically contiguous
memory requirement using Scatter/Gather feature that exists in Linux stack.

With this fix Scatter-Gather will be supported also in connected mode.

This change reverts some of the change made in commit e112373fd6
("IPoIB/cm: Reduce connected mode TX object size").

The ability to use SG in IPoIB CM is possible because the coupling
between NETIF_F_SG and NETIF_F_CSUM was removed in commit
ec5f061564 ("net: Kill link between CSUM and SG features.")

Signed-off-by: Yuval Shaia <yuval.shaia@oracle.com>
Acked-by: Christian Marie <christian@ponies.io>
Signed-off-by: Doug Ledford <dledford@redhat.com>
2015-07-14 13:20:13 -04:00
..
core IB/ucm: Fix bitmap wrap when devnum > IB_UCM_MAX_DEVICES 2015-07-14 13:20:12 -04:00
hw RDMA/nes: Fix for incorrect recording of the MAC address 2015-07-14 13:20:11 -04:00
ulp IB/ipoib: Scatter-Gather support in connected mode 2015-07-14 13:20:13 -04:00
Kconfig IB/core: Implement support for MMU notifiers regarding on demand paging regions 2014-12-15 18:13:36 -08:00
Makefile IB: Allow build of hw/ and ulp/ subdirectories independently 2014-06-02 14:51:12 -07:00