From: Igor Romanov <igor.roma...@oktetlabs.ru>
Update generic code to check that MTU and Rx buffer sizes
do not result in more Rx scatter segments than NIC can make.
Signed-off-by: Igor Romanov <igor.roma...@oktetlabs.ru>
Signed-off-by: Andrew Rybchenko <arybche...@solarflare.com>
---
drivers/net/sfc/sfc_ethdev.c | 3 ++-
drivers/net/sfc/sfc_rx.c | 17 ++++++++++++++---
drivers/net/sfc/sfc_rx.h | 1 +
3 files changed, 17 insertions(+), 4 deletions(-)
diff --git a/drivers/net/sfc/sfc_ethdev.c b/drivers/net/sfc/sfc_ethdev.c
index f41d0f5fe2..ca1b99a00f 100644
--- a/drivers/net/sfc/sfc_ethdev.c
+++ b/drivers/net/sfc/sfc_ethdev.c
@@ -954,7 +954,8 @@ sfc_check_scatter_on_all_rx_queues(struct sfc_adapter *sa,
size_t pdu)
if (!sfc_rx_check_scatter(pdu, sa->rxq_ctrl[i].buf_size,
encp->enc_rx_prefix_size,
- scatter_enabled, &error)) {
+ scatter_enabled,
+ encp->enc_rx_scatter_max, &error)) {
sfc_err(sa, "MTU check for RxQ %u failed: %s", i,
error);
return EINVAL;
diff --git a/drivers/net/sfc/sfc_rx.c b/drivers/net/sfc/sfc_rx.c
index 3e5c8e42da..7c50fe58b8 100644
--- a/drivers/net/sfc/sfc_rx.c
+++ b/drivers/net/sfc/sfc_rx.c
@@ -378,10 +378,20 @@ sfc_efx_rx_qdesc_status(struct sfc_dp_rxq *dp_rxq,
uint16_t offset)
boolean_t
sfc_rx_check_scatter(size_t pdu, size_t rx_buf_size, uint32_t rx_prefix_size,
- boolean_t rx_scatter_enabled, const char **error)
+ boolean_t rx_scatter_enabled, uint32_t rx_scatter_max,
+ const char **error)
{
- if ((rx_buf_size < pdu + rx_prefix_size) && !rx_scatter_enabled) {
- *error = "Rx scatter is disabled and RxQ mbuf pool object size
is too small";
+ uint32_t effective_rx_scatter_max;
+ uint32_t rx_scatter_bufs;
+
+ effective_rx_scatter_max = rx_scatter_enabled ? rx_scatter_max : 1;
+ rx_scatter_bufs = EFX_DIV_ROUND_UP(pdu + rx_prefix_size, rx_buf_size);
+
+ if (rx_scatter_bufs > effective_rx_scatter_max) {
+ if (rx_scatter_enabled)
+ *error = "Possible number of Rx scatter buffers exceeds
maximum number";
+ else
+ *error = "Rx scatter is disabled and RxQ mbuf pool
object size is too small";
return B_FALSE;
}
@@ -1084,6 +1094,7 @@ sfc_rx_qinit(struct sfc_adapter *sa, unsigned int
sw_index,
if (!sfc_rx_check_scatter(sa->port.pdu, buf_size,
encp->enc_rx_prefix_size,
(offloads & DEV_RX_OFFLOAD_SCATTER),
+ encp->enc_rx_scatter_max,
&error)) {
sfc_err(sa, "RxQ %u MTU check failed: %s", sw_index, error);
sfc_err(sa, "RxQ %u calculated Rx buffer size is %u vs "
diff --git a/drivers/net/sfc/sfc_rx.h b/drivers/net/sfc/sfc_rx.h
index b0b5327a49..d6ee9cf802 100644
--- a/drivers/net/sfc/sfc_rx.h
+++ b/drivers/net/sfc/sfc_rx.h
@@ -147,6 +147,7 @@ uint64_t sfc_rx_hf_efx_to_rte(struct sfc_rss *rss,
efx_rx_hash_type_t efx);
boolean_t sfc_rx_check_scatter(size_t pdu, size_t rx_buf_size,
uint32_t rx_prefix_size,
boolean_t rx_scatter_enabled,
+ uint32_t rx_scatter_max,
const char **error);
#ifdef __cplusplus
--
2.17.1
