diff options
| -rw-r--r-- | drivers/scsi/fcoe/fcoe.c | 43 |
1 files changed, 13 insertions, 30 deletions
diff --git a/drivers/scsi/fcoe/fcoe.c b/drivers/scsi/fcoe/fcoe.c index 528b86bca49..ba710e350ac 100644 --- a/drivers/scsi/fcoe/fcoe.c +++ b/drivers/scsi/fcoe/fcoe.c @@ -1270,30 +1270,20 @@ static int fcoe_cpu_callback(struct notifier_block *nfb, /** * fcoe_select_cpu() - Selects CPU to handle post-processing of incoming * command. - * @curr_cpu: CPU which received request * - * This routine selects next CPU based on cpumask. + * This routine selects next CPU based on cpumask to distribute + * incoming requests in round robin. * - * Returns: int (CPU number). Caller to verify if returned CPU is online or not. + * Returns: int CPU number */ -static unsigned int fcoe_select_cpu(unsigned int curr_cpu) +static inline unsigned int fcoe_select_cpu(void) { static unsigned int selected_cpu; - if (num_online_cpus() == 1) - return curr_cpu; - /* - * Doing following check, to skip "curr_cpu (smp_processor_id)" - * from selection of CPU is intentional. This is to avoid same CPU - * doing post-processing of command. "curr_cpu" to just receive - * incoming request in case where rx_id is UNKNOWN and all other - * CPU to actually process the command(s) - */ - do { - selected_cpu = cpumask_next(selected_cpu, cpu_online_mask); - if (selected_cpu >= nr_cpu_ids) - selected_cpu = cpumask_first(cpu_online_mask); - } while (selected_cpu == curr_cpu); + selected_cpu = cpumask_next(selected_cpu, cpu_online_mask); + if (selected_cpu >= nr_cpu_ids) + selected_cpu = cpumask_first(cpu_online_mask); + return selected_cpu; } @@ -1368,23 +1358,16 @@ int fcoe_rcv(struct sk_buff *skb, struct net_device *netdev, * In case the incoming frame's exchange is originated from * the initiator, then received frame's exchange id is ANDed * with fc_cpu_mask bits to get the same cpu on which exchange - * was originated, otherwise just use the current cpu. + * was originated, otherwise select cpu using rx exchange id + * or fcoe_select_cpu(). */ if (ntoh24(fh->fh_f_ctl) & FC_FC_EX_CTX) cpu = ntohs(fh->fh_ox_id) & fc_cpu_mask; else { - cpu = smp_processor_id(); - - if ((fh->fh_type == FC_TYPE_FCP) && - (ntohs(fh->fh_rx_id) == FC_XID_UNKNOWN)) { - do { - cpu = fcoe_select_cpu(cpu); - } while (!cpu_online(cpu)); - } else if ((fh->fh_type == FC_TYPE_FCP) && - (ntohs(fh->fh_rx_id) != FC_XID_UNKNOWN)) { + if (ntohs(fh->fh_rx_id) == FC_XID_UNKNOWN) + cpu = fcoe_select_cpu(); + else cpu = ntohs(fh->fh_rx_id) & fc_cpu_mask; - } else - cpu = smp_processor_id(); } if (cpu >= nr_cpu_ids) |