IB/srp: Allow sg_tablesize to be adjusted
Make the sg_tablesize used by SRP adjustable at module load time via a
module parameter. Calculate the corresponding IU length required to
support this.
Signed-off-by: Vu Pham <vu@mellanox.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c
index 8e6b103..a01b73b 100644
--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -62,6 +62,13 @@
"v" DRV_VERSION " (" DRV_RELDATE ")");
MODULE_LICENSE("Dual BSD/GPL");
+static int srp_sg_tablesize = SRP_DEF_SG_TABLESIZE;
+static int srp_max_iu_len;
+
+module_param(srp_sg_tablesize, int, 0444);
+MODULE_PARM_DESC(srp_sg_tablesize,
+ "Max number of gather/scatter entries per I/O (default is 12)");
+
static int topspin_workarounds = 1;
module_param(topspin_workarounds, int, 0444);
@@ -311,7 +318,7 @@
req->priv.opcode = SRP_LOGIN_REQ;
req->priv.tag = 0;
- req->priv.req_it_iu_len = cpu_to_be32(SRP_MAX_IU_LEN);
+ req->priv.req_it_iu_len = cpu_to_be32(srp_max_iu_len);
req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
SRP_BUF_FORMAT_INDIRECT);
memcpy(req->priv.initiator_port_id, target->srp_host->initiator_port_id, 16);
@@ -953,7 +960,7 @@
goto err;
dma_sync_single_for_cpu(target->srp_host->dev->dev->dma_device, iu->dma,
- SRP_MAX_IU_LEN, DMA_TO_DEVICE);
+ srp_max_iu_len, DMA_TO_DEVICE);
req = list_entry(target->free_reqs.next, struct srp_request, list);
@@ -986,7 +993,7 @@
}
dma_sync_single_for_device(target->srp_host->dev->dev->dma_device, iu->dma,
- SRP_MAX_IU_LEN, DMA_TO_DEVICE);
+ srp_max_iu_len, DMA_TO_DEVICE);
if (__srp_post_send(target, iu, len)) {
printk(KERN_ERR PFX "Send failed\n");
@@ -1018,7 +1025,7 @@
for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
target->tx_ring[i] = srp_alloc_iu(target->srp_host,
- SRP_MAX_IU_LEN,
+ srp_max_iu_len,
GFP_KERNEL, DMA_TO_DEVICE);
if (!target->tx_ring[i])
goto err;
@@ -1436,7 +1443,6 @@
.eh_host_reset_handler = srp_reset_host,
.can_queue = SRP_SQ_SIZE,
.this_id = -1,
- .sg_tablesize = SRP_MAX_INDIRECT,
.cmd_per_lun = SRP_SQ_SIZE,
.use_clustering = ENABLE_CLUSTERING,
.shost_attrs = srp_host_attrs
@@ -1914,6 +1920,11 @@
{
int ret;
+ srp_template.sg_tablesize = srp_sg_tablesize;
+ srp_max_iu_len = (sizeof (struct srp_cmd) +
+ sizeof (struct srp_indirect_buf) +
+ srp_sg_tablesize * 16);
+
ret = class_register(&srp_class);
if (ret) {
printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");