diff options
Diffstat (limited to 'drivers/net/ethernet/cavium/liquidio/request_manager.c')
-rw-r--r-- | drivers/net/ethernet/cavium/liquidio/request_manager.c | 116 |
1 files changed, 73 insertions, 43 deletions
diff --git a/drivers/net/ethernet/cavium/liquidio/request_manager.c b/drivers/net/ethernet/cavium/liquidio/request_manager.c index 8649677b2411..7eafa75ac095 100644 --- a/drivers/net/ethernet/cavium/liquidio/request_manager.c +++ b/drivers/net/ethernet/cavium/liquidio/request_manager.c @@ -51,7 +51,7 @@ struct iq_post_status { }; static void check_db_timeout(struct work_struct *work); -static void __check_db_timeout(struct octeon_device *oct, unsigned long iq_no); +static void __check_db_timeout(struct octeon_device *oct, u64 iq_no); static void (*reqtype_free_fn[MAX_OCTEON_DEVICES][REQTYPE_LAST + 1]) (void *); @@ -149,8 +149,11 @@ int octeon_init_instr_queue(struct octeon_device *oct, /* Initialize the spinlock for this instruction queue */ spin_lock_init(&iq->lock); + spin_lock_init(&iq->post_lock); - oct->io_qmask.iq |= (1 << iq_no); + spin_lock_init(&iq->iq_flush_running_lock); + + oct->io_qmask.iq |= (1ULL << iq_no); /* Set the 32B/64B mode for each input queue */ oct->io_qmask.iq64B |= ((conf->instr_type == 64) << iq_no); @@ -253,8 +256,8 @@ int lio_wait_for_instr_fetch(struct octeon_device *oct) instr_cnt = 0; /*for (i = 0; i < oct->num_iqs; i++) {*/ - for (i = 0; i < MAX_OCTEON_INSTR_QUEUES; i++) { - if (!(oct->io_qmask.iq & (1UL << i))) + for (i = 0; i < MAX_OCTEON_INSTR_QUEUES(oct); i++) { + if (!(oct->io_qmask.iq & (1ULL << i))) continue; pending = atomic_read(&oct-> @@ -391,13 +394,13 @@ __add_to_request_list(struct octeon_instr_queue *iq, int lio_process_iq_request_list(struct octeon_device *oct, - struct octeon_instr_queue *iq) + struct octeon_instr_queue *iq, u32 napi_budget) { int reqtype; void *buf; u32 old = iq->flush_index; u32 inst_count = 0; - unsigned pkts_compl = 0, bytes_compl = 0; + unsigned int pkts_compl = 0, bytes_compl = 0; struct octeon_soft_command *sc; struct octeon_instr_irh *irh; @@ -457,6 +460,9 @@ lio_process_iq_request_list(struct octeon_device *oct, skip_this: inst_count++; INCR_INDEX_BY1(old, iq->max_count); + + if ((napi_budget) && (inst_count >= napi_budget)) + break; } if (bytes_compl) octeon_report_tx_completion_to_bql(iq->app_ctx, pkts_compl, @@ -466,38 +472,63 @@ lio_process_iq_request_list(struct octeon_device *oct, return inst_count; } -static inline void -update_iq_indices(struct octeon_device *oct, struct octeon_instr_queue *iq) +/* Can only be called from process context */ +int +octeon_flush_iq(struct octeon_device *oct, struct octeon_instr_queue *iq, + u32 pending_thresh, u32 napi_budget) { u32 inst_processed = 0; + u32 tot_inst_processed = 0; + int tx_done = 1; - /* Calculate how many commands Octeon has read and move the read index - * accordingly. - */ - iq->octeon_read_index = oct->fn_list.update_iq_read_idx(oct, iq); + if (!spin_trylock(&iq->iq_flush_running_lock)) + return tx_done; - /* Move the NORESPONSE requests to the per-device completion list. */ - if (iq->flush_index != iq->octeon_read_index) - inst_processed = lio_process_iq_request_list(oct, iq); + spin_lock_bh(&iq->lock); - if (inst_processed) { - atomic_sub(inst_processed, &iq->instr_pending); - iq->stats.instr_processed += inst_processed; - } -} + iq->octeon_read_index = oct->fn_list.update_iq_read_idx(iq); -static void -octeon_flush_iq(struct octeon_device *oct, struct octeon_instr_queue *iq, - u32 pending_thresh) -{ if (atomic_read(&iq->instr_pending) >= (s32)pending_thresh) { - spin_lock_bh(&iq->lock); - update_iq_indices(oct, iq); - spin_unlock_bh(&iq->lock); + do { + /* Process any outstanding IQ packets. */ + if (iq->flush_index == iq->octeon_read_index) + break; + + if (napi_budget) + inst_processed = lio_process_iq_request_list + (oct, iq, + napi_budget - tot_inst_processed); + else + inst_processed = + lio_process_iq_request_list(oct, iq, 0); + + if (inst_processed) { + atomic_sub(inst_processed, &iq->instr_pending); + iq->stats.instr_processed += inst_processed; + } + + tot_inst_processed += inst_processed; + inst_processed = 0; + + } while (tot_inst_processed < napi_budget); + + if (napi_budget && (tot_inst_processed >= napi_budget)) + tx_done = 0; } + + iq->last_db_time = jiffies; + + spin_unlock_bh(&iq->lock); + + spin_unlock(&iq->iq_flush_running_lock); + + return tx_done; } -static void __check_db_timeout(struct octeon_device *oct, unsigned long iq_no) +/* Process instruction queue after timeout. + * This routine gets called from a workqueue or when removing the module. + */ +static void __check_db_timeout(struct octeon_device *oct, u64 iq_no) { struct octeon_instr_queue *iq; u64 next_time; @@ -508,24 +539,17 @@ static void __check_db_timeout(struct octeon_device *oct, unsigned long iq_no) if (!iq) return; + /* return immediately, if no work pending */ + if (!atomic_read(&iq->instr_pending)) + return; /* If jiffies - last_db_time < db_timeout do nothing */ next_time = iq->last_db_time + iq->db_timeout; if (!time_after(jiffies, (unsigned long)next_time)) return; iq->last_db_time = jiffies; - /* Get the lock and prevent tasklets. This routine gets called from - * the poll thread. Instructions can now be posted in tasklet context - */ - spin_lock_bh(&iq->lock); - if (iq->fill_cnt != 0) - ring_doorbell(oct, iq); - - spin_unlock_bh(&iq->lock); - /* Flush the instruction queue */ - if (iq->do_auto_flush) - octeon_flush_iq(oct, iq, 1); + octeon_flush_iq(oct, iq, 1, 0); } /* Called by the Poll thread at regular intervals to check the instruction @@ -550,7 +574,10 @@ octeon_send_command(struct octeon_device *oct, u32 iq_no, struct iq_post_status st; struct octeon_instr_queue *iq = oct->instr_queue[iq_no]; - spin_lock_bh(&iq->lock); + /* Get the lock and prevent other tasks and tx interrupt handler from + * running. + */ + spin_lock_bh(&iq->post_lock); st = __post_command2(oct, iq, force_db, cmd); @@ -566,10 +593,13 @@ octeon_send_command(struct octeon_device *oct, u32 iq_no, INCR_INSTRQUEUE_PKT_COUNT(oct, iq_no, instr_dropped, 1); } - spin_unlock_bh(&iq->lock); + spin_unlock_bh(&iq->post_lock); - if (iq->do_auto_flush) - octeon_flush_iq(oct, iq, 2); + /* This is only done here to expedite packets being flushed + * for cases where there are no IQ completion interrupts. + */ + /*if (iq->do_auto_flush)*/ + /* octeon_flush_iq(oct, iq, 2, 0);*/ return st.status; } |