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>
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@ -3424,6 +3424,7 @@ enum {
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SRP_OPT_IP_DEST = 1 << 16,
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SRP_OPT_TARGET_CAN_QUEUE= 1 << 17,
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SRP_OPT_MAX_IT_IU_SIZE = 1 << 18,
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SRP_OPT_CH_COUNT = 1 << 19,
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};
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static unsigned int srp_opt_mandatory[] = {
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@ -3457,6 +3458,7 @@ static const match_table_t srp_opt_tokens = {
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{ SRP_OPT_IP_SRC, "src=%s" },
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{ SRP_OPT_IP_DEST, "dest=%s" },
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{ SRP_OPT_MAX_IT_IU_SIZE, "max_it_iu_size=%d" },
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{ SRP_OPT_CH_COUNT, "ch_count=%u", },
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{ SRP_OPT_ERR, NULL }
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};
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@ -3758,6 +3760,14 @@ static int srp_parse_options(struct net *net, const char *buf,
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target->max_it_iu_size = token;
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break;
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case SRP_OPT_CH_COUNT:
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if (match_int(args, &token) || token < 1) {
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pr_warn("bad channel count %s\n", p);
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goto out;
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}
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target->ch_count = token;
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break;
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default:
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pr_warn("unknown parameter or missing value '%s' in target creation request\n",
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p);
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@ -3921,11 +3931,13 @@ static ssize_t srp_create_target(struct device *dev,
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goto out;
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ret = -ENOMEM;
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target->ch_count = max_t(unsigned, num_online_nodes(),
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min(ch_count ? :
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min(4 * num_online_nodes(),
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ibdev->num_comp_vectors),
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num_online_cpus()));
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if (target->ch_count == 0)
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target->ch_count =
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max_t(unsigned int, num_online_nodes(),
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min(ch_count ?:
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min(4 * num_online_nodes(),
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ibdev->num_comp_vectors),
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num_online_cpus()));
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target->ch = kcalloc(target->ch_count, sizeof(*target->ch),
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GFP_KERNEL);
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if (!target->ch)
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