[PATCH] scsi: csiostor: create per port irq affinity mask set

[Varun Prakash]

csiostor driver allocates per port num_online_cpus()
irq vectors, so create per port irq affinity mask
set to spread irq vectors evenly.

Signed-off-by: Varun Prakash <va...@chelsio.com>
---
 drivers/scsi/csiostor/csio_isr.c | 28 +++++++++++++++++++++++++++-
 1 file changed, 27 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/csiostor/csio_isr.c b/drivers/scsi/csiostor/csio_isr.c
index 7c88147..b254040 100644
--- a/drivers/scsi/csiostor/csio_isr.c
+++ b/drivers/scsi/csiostor/csio_isr.c
@@ -474,13 +474,39 @@ csio_reduce_sqsets(struct csio_hw *hw, int cnt)
        csio_dbg(hw, "Reduced sqsets to %d\n", hw->num_sqsets);
 }
 
+static void csio_calc_sets(struct irq_affinity *affd, unsigned int nvecs)
+{
+       struct csio_hw *hw = affd->priv;
+       u8 i;
+
+       if (!nvecs)
+               return;
+
+       if (nvecs < hw->num_pports) {
+               affd->nr_sets = 1;
+               affd->set_size[0] = nvecs;
+               return;
+       }
+
+       affd->nr_sets = hw->num_pports;
+       for (i = 0; i < hw->num_pports; i++)
+               affd->set_size[i] = nvecs / hw->num_pports;
+}
+
 static int
 csio_enable_msix(struct csio_hw *hw)
 {
        int i, j, k, n, min, cnt;
        int extra = CSIO_EXTRA_VECS;
        struct csio_scsi_cpu_info *info;
-       struct irq_affinity desc = { .pre_vectors = 2 };
+       struct irq_affinity desc = {
+               .pre_vectors = CSIO_EXTRA_VECS,
+               .calc_sets = csio_calc_sets,
+               .priv = hw,
+       };
+
+       if (hw->num_pports > IRQ_AFFINITY_MAX_SETS)
+               return -ENOSPC;
 
        min = hw->num_pports + extra;
        cnt = hw->num_sqsets + extra;
-- 
2.0.2