diff options
Diffstat (limited to 'drivers/staging/rdma/hfi1/pio.c')
| -rw-r--r-- | drivers/staging/rdma/hfi1/pio.c | 52 |
1 files changed, 41 insertions, 11 deletions
diff --git a/drivers/staging/rdma/hfi1/pio.c b/drivers/staging/rdma/hfi1/pio.c index c6849ce9e5eb..c67b9ad3fcf4 100644 --- a/drivers/staging/rdma/hfi1/pio.c +++ b/drivers/staging/rdma/hfi1/pio.c @@ -139,23 +139,30 @@ void pio_send_control(struct hfi1_devdata *dd, int op) /* Send Context Size (SCS) wildcards */ #define SCS_POOL_0 -1 #define SCS_POOL_1 -2 + /* Send Context Count (SCC) wildcards */ #define SCC_PER_VL -1 #define SCC_PER_CPU -2 - #define SCC_PER_KRCVQ -3 -#define SCC_ACK_CREDITS 32 + +/* Send Context Size (SCS) constants */ +#define SCS_ACK_CREDITS 32 +#define SCS_VL15_CREDITS 102 /* 3 pkts of 2048B data + 128B header */ + +#define PIO_THRESHOLD_CEILING 4096 #define PIO_WAIT_BATCH_SIZE 5 /* default send context sizes */ static struct sc_config_sizes sc_config_sizes[SC_MAX] = { [SC_KERNEL] = { .size = SCS_POOL_0, /* even divide, pool 0 */ - .count = SCC_PER_VL },/* one per NUMA */ - [SC_ACK] = { .size = SCC_ACK_CREDITS, + .count = SCC_PER_VL }, /* one per NUMA */ + [SC_ACK] = { .size = SCS_ACK_CREDITS, .count = SCC_PER_KRCVQ }, [SC_USER] = { .size = SCS_POOL_0, /* even divide, pool 0 */ .count = SCC_PER_CPU }, /* one per CPU */ + [SC_VL15] = { .size = SCS_VL15_CREDITS, + .count = 1 }, }; @@ -202,7 +209,8 @@ static int wildcard_to_pool(int wc) static const char *sc_type_names[SC_MAX] = { "kernel", "ack", - "user" + "user", + "vl15" }; static const char *sc_type_name(int index) @@ -231,6 +239,22 @@ int init_sc_pools_and_sizes(struct hfi1_devdata *dd) int i; /* + * When SDMA is enabled, kernel context pio packet size is capped by + * "piothreshold". Reduce pio buffer allocation for kernel context by + * setting it to a fixed size. The allocation allows 3-deep buffering + * of the largest pio packets plus up to 128 bytes header, sufficient + * to maintain verbs performance. + * + * When SDMA is disabled, keep the default pooling allocation. + */ + if (HFI1_CAP_IS_KSET(SDMA)) { + u16 max_pkt_size = (piothreshold < PIO_THRESHOLD_CEILING) ? + piothreshold : PIO_THRESHOLD_CEILING; + sc_config_sizes[SC_KERNEL].size = + 3 * (max_pkt_size + 128) / PIO_BLOCK_SIZE; + } + + /* * Step 0: * - copy the centipercents/absolute sizes from the pool config * - sanity check these values @@ -311,7 +335,7 @@ int init_sc_pools_and_sizes(struct hfi1_devdata *dd) if (i == SC_ACK) { count = dd->n_krcv_queues; } else if (i == SC_KERNEL) { - count = (INIT_SC_PER_VL * num_vls) + 1 /* VL15 */; + count = INIT_SC_PER_VL * num_vls; } else if (count == SCC_PER_CPU) { count = dd->num_rcv_contexts - dd->n_krcv_queues; } else if (count < 0) { @@ -596,7 +620,7 @@ u32 sc_mtu_to_threshold(struct send_context *sc, u32 mtu, u32 hdrqentsize) * Return value is what to write into the CSR: trigger return when * unreturned credits pass this count. */ -static u32 sc_percent_to_threshold(struct send_context *sc, u32 percent) +u32 sc_percent_to_threshold(struct send_context *sc, u32 percent) { return (sc->credits * percent) / 100; } @@ -790,7 +814,10 @@ struct send_context *sc_alloc(struct hfi1_devdata *dd, int type, * For Ack contexts, set a threshold for half the credits. * For User contexts use the given percentage. This has been * sanitized on driver start-up. - * For Kernel contexts, use the default MTU plus a header. + * For Kernel contexts, use the default MTU plus a header + * or half the credits, whichever is smaller. This should + * work for both the 3-deep buffering allocation and the + * pooling allocation. */ if (type == SC_ACK) { thresh = sc_percent_to_threshold(sc, 50); @@ -798,7 +825,9 @@ struct send_context *sc_alloc(struct hfi1_devdata *dd, int type, thresh = sc_percent_to_threshold(sc, user_credit_return_threshold); } else { /* kernel */ - thresh = sc_mtu_to_threshold(sc, hfi1_max_mtu, hdrqentsize); + thresh = min(sc_percent_to_threshold(sc, 50), + sc_mtu_to_threshold(sc, hfi1_max_mtu, + hdrqentsize)); } reg = thresh << SC(CREDIT_CTRL_THRESHOLD_SHIFT); /* add in early return */ @@ -1531,7 +1560,8 @@ static void sc_piobufavail(struct send_context *sc) unsigned long flags; unsigned i, n = 0; - if (dd->send_contexts[sc->sw_index].type != SC_KERNEL) + if (dd->send_contexts[sc->sw_index].type != SC_KERNEL && + dd->send_contexts[sc->sw_index].type != SC_VL15) return; list = &sc->piowait; /* @@ -1900,7 +1930,7 @@ int init_pervl_scs(struct hfi1_devdata *dd) u32 ctxt; struct hfi1_pportdata *ppd = dd->pport; - dd->vld[15].sc = sc_alloc(dd, SC_KERNEL, + dd->vld[15].sc = sc_alloc(dd, SC_VL15, dd->rcd[0]->rcvhdrqentsize, dd->node); if (!dd->vld[15].sc) goto nomem; |