sfc: Enable IPv6 RSS using random key for Toeplitz hash

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 21 insertions, 0 deletions

diff --git a/drivers/net/sfc/nic.h b/drivers/net/sfc/nic.h
index 7e3bec8561b8..5825f37b51bd 100644
--- a/drivers/net/sfc/nic.h
+++ b/drivers/net/sfc/nic.h
@@ -135,12 +135,14 @@ static inline struct falcon_board *falcon_board(struct efx_nic *efx)
  * @fw_build: Firmware build number
  * @mcdi: Management-Controller-to-Driver Interface
  * @wol_filter_id: Wake-on-LAN packet filter id
+ * @ipv6_rss_key: Toeplitz hash key for IPv6 RSS
  */
 struct siena_nic_data {
         u64 fw_version;
         u32 fw_build;
         struct efx_mcdi_iface mcdi;
         int wol_filter_id;
+        u8 ipv6_rss_key[40];
 };
 
 extern void siena_print_fwver(struct efx_nic *efx, char *buf, size_t len);
diff --git a/drivers/net/sfc/siena.c b/drivers/net/sfc/siena.c
index 38dcc42c4f79..7bf93faff3ab 100644
--- a/drivers/net/sfc/siena.c
+++ b/drivers/net/sfc/siena.c
@@ -13,6 +13,7 @@
 #include <linux/pci.h>
 #include <linux/module.h>
 #include <linux/slab.h>
+#include <linux/random.h>
 #include "net_driver.h"
 #include "bitfield.h"
 #include "efx.h"
@@ -274,6 +275,9 @@ static int siena_probe_nic(struct efx_nic *efx)
                 goto fail5;
         }
 
+        get_random_bytes(&nic_data->ipv6_rss_key,
+                         sizeof(nic_data->ipv6_rss_key));
+
         return 0;
 
 fail5:
@@ -293,6 +297,7 @@ fail1:
  */
 static int siena_init_nic(struct efx_nic *efx)
 {
+        struct siena_nic_data *nic_data = efx->nic_data;
         efx_oword_t temp;
         int rc;
 
@@ -319,6 +324,20 @@ static int siena_init_nic(struct efx_nic *efx)
         EFX_SET_OWORD_FIELD(temp, FRF_BZ_RX_INGR_EN, 1);
         efx_writeo(efx, &temp, FR_AZ_RX_CFG);
 
+        /* Enable IPv6 RSS */
+        BUILD_BUG_ON(sizeof(nic_data->ipv6_rss_key) !=
+                     2 * sizeof(temp) + FRF_CZ_RX_RSS_IPV6_TKEY_HI_WIDTH / 8 ||
+                     FRF_CZ_RX_RSS_IPV6_TKEY_HI_LBN != 0);
+        memcpy(&temp, nic_data->ipv6_rss_key, sizeof(temp));
+        efx_writeo(efx, &temp, FR_CZ_RX_RSS_IPV6_REG1);
+        memcpy(&temp, nic_data->ipv6_rss_key + sizeof(temp), sizeof(temp));
+        efx_writeo(efx, &temp, FR_CZ_RX_RSS_IPV6_REG2);
+        EFX_POPULATE_OWORD_2(temp, FRF_CZ_RX_RSS_IPV6_THASH_ENABLE, 1,
+                             FRF_CZ_RX_RSS_IPV6_IP_THASH_ENABLE, 1);
+        memcpy(&temp, nic_data->ipv6_rss_key + 2 * sizeof(temp),
+               FRF_CZ_RX_RSS_IPV6_TKEY_HI_WIDTH / 8);
+        efx_writeo(efx, &temp, FR_CZ_RX_RSS_IPV6_REG3);
+
         if (efx_nic_rx_xoff_thresh >= 0 || efx_nic_rx_xon_thresh >= 0)
                 /* No MCDI operation has been defined to set thresholds */
                 EFX_ERR(efx, "ignoring RX flow control thresholds\n");