diff options
| author | CQ Tang <cq.tang@intel.com> | 2013-07-19 21:57:21 +0400 |
|---|---|---|
| committer | Roland Dreier <roland@purestorage.com> | 2013-08-13 22:14:34 +0400 |
| commit | 4668e4b527d2263a74a85334243bb740905da51e (patch) | |
| tree | 4ef164dc33ae416ab87cf860a7718fdb7ef662c8 /drivers/infiniband/hw/qib/qib_sdma.c | |
| parent | c095ba7224d8edc71dcef0d655911399a8bd4a3f (diff) | |
| download | linux-4668e4b527d2263a74a85334243bb740905da51e.tar.xz | |
IB/qib: Improve SDMA performance
1. The code accepts chunks of messages, and splits the chunk into
packets when converting packets into sdma queue entries. Adjacent
packets will use user buffer pages smartly to avoid pinning the
same page multiple times.
2. Instead of discarding all the work when SDMA queue is full, the
work is saved in a pending queue. Whenever there are enough SDMA
queue free entries, pending queue is directly put onto SDMA queue.
3. An interrupt handler is used to progress this pending queue.
Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: CQ Tang <cq.tang@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
[ Fixed up sparse warnings. - Roland ]
Signed-off-by: Roland Dreier <roland@purestorage.com>
Diffstat (limited to 'drivers/infiniband/hw/qib/qib_sdma.c')
| -rw-r--r-- | drivers/infiniband/hw/qib/qib_sdma.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/infiniband/hw/qib/qib_sdma.c b/drivers/infiniband/hw/qib/qib_sdma.c index 9b5322d8cd5a..c6d6a54d2e19 100644 --- a/drivers/infiniband/hw/qib/qib_sdma.c +++ b/drivers/infiniband/hw/qib/qib_sdma.c @@ -423,8 +423,11 @@ void qib_sdma_intr(struct qib_pportdata *ppd) void __qib_sdma_intr(struct qib_pportdata *ppd) { - if (__qib_sdma_running(ppd)) + if (__qib_sdma_running(ppd)) { qib_sdma_make_progress(ppd); + if (!list_empty(&ppd->sdma_userpending)) + qib_user_sdma_send_desc(ppd, &ppd->sdma_userpending); + } } int qib_setup_sdma(struct qib_pportdata *ppd) @@ -452,6 +455,9 @@ int qib_setup_sdma(struct qib_pportdata *ppd) ppd->sdma_descq_removed = 0; ppd->sdma_descq_added = 0; + ppd->sdma_intrequest = 0; + INIT_LIST_HEAD(&ppd->sdma_userpending); + INIT_LIST_HEAD(&ppd->sdma_activelist); tasklet_init(&ppd->sdma_sw_clean_up_task, sdma_sw_clean_up_task, |