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RDMA/srp: Make the channel count configurable per target 

Increase the flexibility of the SRP initiator driver by making the channel
count configurable per target instead of only providing a kernel module
parameter for configuring the channel count.

Link: https://lore.kernel.org/r/20200525172212.14413-2-bvanassche@acm.org
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Bart Van Assche 2020-05-25 10:22:09 -07:00 committed by Jason Gunthorpe
parent 50aec2c313
commit 87fee61c35
1 changed files with 17 additions and 5 deletions
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22
drivers/infiniband/ulp/srp/ib_srp.c
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@ -3424,6 +3424,7 @@ enum {
SRP_OPT_IP_DEST = 1 << 16,
SRP_OPT_TARGET_CAN_QUEUE= 1 << 17,
SRP_OPT_MAX_IT_IU_SIZE = 1 << 18,
SRP_OPT_CH_COUNT = 1 << 19,
};
static unsigned int srp_opt_mandatory[] = {
@ -3457,6 +3458,7 @@ static const match_table_t srp_opt_tokens = {
{ SRP_OPT_IP_SRC, "src=%s" },
{ SRP_OPT_IP_DEST, "dest=%s" },
{ SRP_OPT_MAX_IT_IU_SIZE, "max_it_iu_size=%d" },
{ SRP_OPT_CH_COUNT, "ch_count=%u", },
{ SRP_OPT_ERR, NULL }
};
@ -3758,6 +3760,14 @@ static int srp_parse_options(struct net *net, const char *buf,
target->max_it_iu_size = token;
break;
case SRP_OPT_CH_COUNT:
if (match_int(args, &token) || token < 1) {
pr_warn("bad channel count %s\n", p);
goto out;
}
target->ch_count = token;
break;
default:
pr_warn("unknown parameter or missing value '%s' in target creation request\n",
p);
@ -3921,11 +3931,13 @@ static ssize_t srp_create_target(struct device *dev,
goto out;
ret = -ENOMEM;
target->ch_count = max_t(unsigned, num_online_nodes(),
min(ch_count ? :
min(4 * num_online_nodes(),
ibdev->num_comp_vectors),
num_online_cpus()));
if (target->ch_count == 0)
target->ch_count =
max_t(unsigned int, num_online_nodes(),
min(ch_count ?:
min(4 * num_online_nodes(),
ibdev->num_comp_vectors),
num_online_cpus()));
target->ch = kcalloc(target->ch_count, sizeof(*target->ch),
GFP_KERNEL);
if (!target->ch)