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IB/hfi1: Add RSM rule for user FECN handling

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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>
This commit is contained in:
Dean Luick 2016-04-12 11:32:06 -07:00 committed by Doug Ledford
parent b12349ae13
commit 8f000f7f6e
1 changed files with 84 additions and 0 deletions
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84
drivers/staging/rdma/hfi1/chip.c
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@ -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);