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authorDean Luick <dean.luick@intel.com>2016-04-12 11:32:06 -0700
committerDoug Ledford <dledford@redhat.com>2016-04-28 16:32:29 -0400
commit8f000f7f6e0ad8973f76cc64ecbc4d84099ff959 (patch)
treebbecbc3359c074fe600476d2073fbcc099bfa07d /drivers/staging
parentIB/hfi1: Create a routine to set a receive side mapping rule (diff)
downloadlinux-dev-8f000f7f6e0ad8973f76cc64ecbc4d84099ff959.tar.xz
linux-dev-8f000f7f6e0ad8973f76cc64ecbc4d84099ff959.zip
IB/hfi1: Add RSM rule for user FECN handling
Add a receive side mapping rule to extract expected user packets with the FECN bit set and place them in an eager buffer. This will allow user libraries to recognize that a FECN was sent when using header suppression and respond appropriately. Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com> Signed-off-by: Dean Luick <dean.luick@intel.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
Diffstat (limited to 'drivers/staging')
-rw-r--r--drivers/staging/rdma/hfi1/chip.c84
1 files changed, 84 insertions, 0 deletions
diff --git a/drivers/staging/rdma/hfi1/chip.c b/drivers/staging/rdma/hfi1/chip.c
index b5edc3ac3c17..386309c67efd 100644
--- a/drivers/staging/rdma/hfi1/chip.c
+++ b/drivers/staging/rdma/hfi1/chip.c
@@ -1034,6 +1034,8 @@ static void read_planned_down_reason_code(struct hfi1_devdata *dd, u8 *pdrrc);
static void handle_temp_err(struct hfi1_devdata *);
static void dc_shutdown(struct hfi1_devdata *);
static void dc_start(struct hfi1_devdata *);
+static int qos_rmt_entries(struct hfi1_devdata *dd, unsigned int *mp,
+ unsigned int *np);
/*
* Error interrupt table entry. This is used as input to the interrupt
@@ -12628,6 +12630,8 @@ static int set_up_context_variables(struct hfi1_devdata *dd)
int total_contexts;
int ret;
unsigned ngroups;
+ int qos_rmt_count;
+ int user_rmt_reduced;
/*
* Kernel receive contexts:
@@ -12683,6 +12687,19 @@ static int set_up_context_variables(struct hfi1_devdata *dd)
total_contexts = num_kernel_contexts + num_user_contexts;
}
+ /* each user context requires an entry in the RMT */
+ qos_rmt_count = qos_rmt_entries(dd, NULL, NULL);
+ if (qos_rmt_count + num_user_contexts > NUM_MAP_ENTRIES) {
+ user_rmt_reduced = NUM_MAP_ENTRIES - qos_rmt_count;
+ dd_dev_err(dd,
+ "RMT size is reducing the number of user receive contexts from %d to %d\n",
+ (int)num_user_contexts,
+ user_rmt_reduced);
+ /* recalculate */
+ num_user_contexts = user_rmt_reduced;
+ total_contexts = num_kernel_contexts + num_user_contexts;
+ }
+
/* the first N are kernel contexts, the rest are user contexts */
dd->num_rcv_contexts = total_contexts;
dd->n_krcv_queues = num_kernel_contexts;
@@ -13633,6 +13650,72 @@ bail:
init_qpmap_table(dd, FIRST_KERNEL_KCTXT, dd->n_krcv_queues - 1);
}
+static void init_user_fecn_handling(struct hfi1_devdata *dd,
+ struct rsm_map_table *rmt)
+{
+ struct rsm_rule_data rrd;
+ u64 reg;
+ int i, idx, regoff, regidx;
+ u8 offset;
+
+ /* there needs to be enough room in the map table */
+ if (rmt->used + dd->num_user_contexts >= NUM_MAP_ENTRIES) {
+ dd_dev_err(dd, "User FECN handling disabled - too many user contexts allocated\n");
+ return;
+ }
+
+ /*
+ * RSM will extract the destination context as an index into the
+ * map table. The destination contexts are a sequential block
+ * in the range first_user_ctxt...num_rcv_contexts-1 (inclusive).
+ * Map entries are accessed as offset + extracted value. Adjust
+ * the added offset so this sequence can be placed anywhere in
+ * the table - as long as the entries themselves do not wrap.
+ * There are only enough bits in offset for the table size, so
+ * start with that to allow for a "negative" offset.
+ */
+ offset = (u8)(NUM_MAP_ENTRIES + (int)rmt->used -
+ (int)dd->first_user_ctxt);
+
+ for (i = dd->first_user_ctxt, idx = rmt->used;
+ i < dd->num_rcv_contexts; i++, idx++) {
+ /* replace with identity mapping */
+ regoff = (idx % 8) * 8;
+ regidx = idx / 8;
+ reg = rmt->map[regidx];
+ reg &= ~(RCV_RSM_MAP_TABLE_RCV_CONTEXT_A_MASK << regoff);
+ reg |= (u64)i << regoff;
+ rmt->map[regidx] = reg;
+ }
+
+ /*
+ * For RSM intercept of Expected FECN packets:
+ * o packet type 0 - expected
+ * o match on F (bit 95), using select/match 1, and
+ * o match on SH (bit 133), using select/match 2.
+ *
+ * Use index 1 to extract the 8-bit receive context from DestQP
+ * (start at bit 64). Use that as the RSM map table index.
+ */
+ rrd.offset = offset;
+ rrd.pkt_type = 0;
+ rrd.field1_off = 95;
+ rrd.field2_off = 133;
+ rrd.index1_off = 64;
+ rrd.index1_width = 8;
+ rrd.index2_off = 0;
+ rrd.index2_width = 0;
+ rrd.mask1 = 1;
+ rrd.value1 = 1;
+ rrd.mask2 = 1;
+ rrd.value2 = 1;
+
+ /* add rule 1 */
+ add_rsm_rule(dd, 1, &rrd);
+
+ rmt->used += dd->num_user_contexts;
+}
+
static void init_rxe(struct hfi1_devdata *dd)
{
struct rsm_map_table *rmt;
@@ -13643,6 +13726,7 @@ static void init_rxe(struct hfi1_devdata *dd)
rmt = alloc_rsm_map_table(dd);
/* set up QOS, including the QPN map table */
init_qos(dd, rmt);
+ init_user_fecn_handling(dd, rmt);
complete_rsm_map_table(dd, rmt);
kfree(rmt);