netdevsim: add dummy macsec offload

When the kernel is compiled with MACsec support, add the
NETIF_F_HW_MACSEC feature to netdevsim devices and implement
macsec_ops.

To allow easy testing of failure from the device, support is limited
to 3 SecY's per netdevsim device, and 1 RXSC per SecY.

v2:
 - nsim_macsec_add_secy, return -ENOSPC if secy_count isn't full but
   we can't find an empty slot (Simon Horman)
 - add sci_to_cpu to make sparse happy (Simon Horman)
 - remove set but not used secy variable (kernel test robot and
   Simon Horman)

Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/netdevsim/Makefile b/drivers/net/netdevsim/Makefile
index 5735e5b1a2cb72582bc3f9197e016f57368948c4..f8de93bc5f5bef2975ce24b30112c67d7b88778a 100644 (file)
--- a/drivers/net/netdevsim/Makefile
+++ b/drivers/net/netdevsim/Makefile
@@ -17,3 +17,7 @@ endif
 ifneq ($(CONFIG_PSAMPLE),)
 netdevsim-objs += psample.o
 endif
+
+ifneq ($(CONFIG_MACSEC),)
+netdevsim-objs += macsec.o
+endif

diff --git a/drivers/net/netdevsim/macsec.c b/drivers/net/netdevsim/macsec.c
new file mode 100644 (file)
index 0000000..0d5f504
--- /dev/null
+++ b/drivers/net/netdevsim/macsec.c
@@ -0,0 +1,356 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <net/macsec.h>
+#include "netdevsim.h"
+
+static inline u64 sci_to_cpu(sci_t sci)
+{
+       return be64_to_cpu((__force __be64)sci);
+}
+
+static int nsim_macsec_find_secy(struct netdevsim *ns, sci_t sci)
+{
+       int i;
+
+       for (i = 0; i < NSIM_MACSEC_MAX_SECY_COUNT; i++) {
+               if (ns->macsec.nsim_secy[i].sci == sci)
+                       return i;
+       }
+
+       return -1;
+}
+
+static int nsim_macsec_find_rxsc(struct nsim_secy *ns_secy, sci_t sci)
+{
+       int i;
+
+       for (i = 0; i < NSIM_MACSEC_MAX_RXSC_COUNT; i++) {
+               if (ns_secy->nsim_rxsc[i].sci == sci)
+                       return i;
+       }
+
+       return -1;
+}
+
+static int nsim_macsec_add_secy(struct macsec_context *ctx)
+{
+       struct netdevsim *ns = netdev_priv(ctx->netdev);
+       int idx;
+
+       if (ns->macsec.nsim_secy_count == NSIM_MACSEC_MAX_SECY_COUNT)
+               return -ENOSPC;
+
+       for (idx = 0; idx < NSIM_MACSEC_MAX_SECY_COUNT; idx++) {
+               if (!ns->macsec.nsim_secy[idx].used)
+                       break;
+       }
+
+       if (idx == NSIM_MACSEC_MAX_SECY_COUNT) {
+               netdev_err(ctx->netdev, "%s: nsim_secy_count not full but all SecYs used\n",
+                          __func__);
+               return -ENOSPC;
+       }
+
+       netdev_dbg(ctx->netdev, "%s: adding new secy with sci %08llx at index %d\n",
+                  __func__, sci_to_cpu(ctx->secy->sci), idx);
+       ns->macsec.nsim_secy[idx].used = true;
+       ns->macsec.nsim_secy[idx].nsim_rxsc_count = 0;
+       ns->macsec.nsim_secy[idx].sci = ctx->secy->sci;
+       ns->macsec.nsim_secy_count++;
+
+       return 0;
+}
+
+static int nsim_macsec_upd_secy(struct macsec_context *ctx)
+{
+       struct netdevsim *ns = netdev_priv(ctx->netdev);
+       int idx;
+
+       idx = nsim_macsec_find_secy(ns, ctx->secy->sci);
+       if (idx < 0) {
+               netdev_err(ctx->netdev, "%s: sci %08llx not found in secy table\n",
+                          __func__, sci_to_cpu(ctx->secy->sci));
+               return -ENOENT;
+       }
+
+       netdev_dbg(ctx->netdev, "%s: updating secy with sci %08llx at index %d\n",
+                  __func__, sci_to_cpu(ctx->secy->sci), idx);
+
+       return 0;
+}
+
+static int nsim_macsec_del_secy(struct macsec_context *ctx)
+{
+       struct netdevsim *ns = netdev_priv(ctx->netdev);
+       int idx;
+
+       idx = nsim_macsec_find_secy(ns, ctx->secy->sci);
+       if (idx < 0) {
+               netdev_err(ctx->netdev, "%s: sci %08llx not found in secy table\n",
+                          __func__, sci_to_cpu(ctx->secy->sci));
+               return -ENOENT;
+       }
+
+       netdev_dbg(ctx->netdev, "%s: removing SecY with SCI %08llx at index %d\n",
+                  __func__, sci_to_cpu(ctx->secy->sci), idx);
+
+       ns->macsec.nsim_secy[idx].used = false;
+       memset(&ns->macsec.nsim_secy[idx], 0, sizeof(ns->macsec.nsim_secy[idx]));
+       ns->macsec.nsim_secy_count--;
+
+       return 0;
+}
+
+static int nsim_macsec_add_rxsc(struct macsec_context *ctx)
+{
+       struct netdevsim *ns = netdev_priv(ctx->netdev);
+       struct nsim_secy *secy;
+       int idx;
+
+       idx = nsim_macsec_find_secy(ns, ctx->secy->sci);
+       if (idx < 0) {
+               netdev_err(ctx->netdev, "%s: sci %08llx not found in secy table\n",
+                          __func__, sci_to_cpu(ctx->secy->sci));
+               return -ENOENT;
+       }
+       secy = &ns->macsec.nsim_secy[idx];
+
+       if (secy->nsim_rxsc_count == NSIM_MACSEC_MAX_RXSC_COUNT)
+               return -ENOSPC;
+
+       for (idx = 0; idx < NSIM_MACSEC_MAX_RXSC_COUNT; idx++) {
+               if (!secy->nsim_rxsc[idx].used)
+                       break;
+       }
+
+       if (idx == NSIM_MACSEC_MAX_RXSC_COUNT)
+               netdev_err(ctx->netdev, "%s: nsim_rxsc_count not full but all RXSCs used\n",
+                          __func__);
+
+       netdev_dbg(ctx->netdev, "%s: adding new rxsc with sci %08llx at index %d\n",
+                  __func__, sci_to_cpu(ctx->rx_sc->sci), idx);
+       secy->nsim_rxsc[idx].used = true;
+       secy->nsim_rxsc[idx].sci = ctx->rx_sc->sci;
+       secy->nsim_rxsc_count++;
+
+       return 0;
+}
+
+static int nsim_macsec_upd_rxsc(struct macsec_context *ctx)
+{
+       struct netdevsim *ns = netdev_priv(ctx->netdev);
+       struct nsim_secy *secy;
+       int idx;
+
+       idx = nsim_macsec_find_secy(ns, ctx->secy->sci);
+       if (idx < 0) {
+               netdev_err(ctx->netdev, "%s: sci %08llx not found in secy table\n",
+                          __func__, sci_to_cpu(ctx->secy->sci));
+               return -ENOENT;
+       }
+       secy = &ns->macsec.nsim_secy[idx];
+
+       idx = nsim_macsec_find_rxsc(secy, ctx->rx_sc->sci);
+       if (idx < 0) {
+               netdev_err(ctx->netdev, "%s: sci %08llx not found in RXSC table\n",
+                          __func__, sci_to_cpu(ctx->rx_sc->sci));
+               return -ENOENT;
+       }
+
+       netdev_dbg(ctx->netdev, "%s: updating RXSC with sci %08llx at index %d\n",
+                  __func__, sci_to_cpu(ctx->rx_sc->sci), idx);
+
+       return 0;
+}
+
+static int nsim_macsec_del_rxsc(struct macsec_context *ctx)
+{
+       struct netdevsim *ns = netdev_priv(ctx->netdev);
+       struct nsim_secy *secy;
+       int idx;
+
+       idx = nsim_macsec_find_secy(ns, ctx->secy->sci);
+       if (idx < 0) {
+               netdev_err(ctx->netdev, "%s: sci %08llx not found in secy table\n",
+                          __func__, sci_to_cpu(ctx->secy->sci));
+               return -ENOENT;
+       }
+       secy = &ns->macsec.nsim_secy[idx];
+
+       idx = nsim_macsec_find_rxsc(secy, ctx->rx_sc->sci);
+       if (idx < 0) {
+               netdev_err(ctx->netdev, "%s: sci %08llx not found in RXSC table\n",
+                          __func__, sci_to_cpu(ctx->rx_sc->sci));
+               return -ENOENT;
+       }
+
+       netdev_dbg(ctx->netdev, "%s: removing RXSC with sci %08llx at index %d\n",
+                  __func__, sci_to_cpu(ctx->rx_sc->sci), idx);
+
+       secy->nsim_rxsc[idx].used = false;
+       memset(&secy->nsim_rxsc[idx], 0, sizeof(secy->nsim_rxsc[idx]));
+       secy->nsim_rxsc_count--;
+
+       return 0;
+}
+
+static int nsim_macsec_add_rxsa(struct macsec_context *ctx)
+{
+       struct netdevsim *ns = netdev_priv(ctx->netdev);
+       struct nsim_secy *secy;
+       int idx;
+
+       idx = nsim_macsec_find_secy(ns, ctx->secy->sci);
+       if (idx < 0) {
+               netdev_err(ctx->netdev, "%s: sci %08llx not found in secy table\n",
+                          __func__, sci_to_cpu(ctx->secy->sci));
+               return -ENOENT;
+       }
+       secy = &ns->macsec.nsim_secy[idx];
+
+       idx = nsim_macsec_find_rxsc(secy, ctx->sa.rx_sa->sc->sci);
+       if (idx < 0) {
+               netdev_err(ctx->netdev, "%s: sci %08llx not found in RXSC table\n",
+                          __func__, sci_to_cpu(ctx->sa.rx_sa->sc->sci));
+               return -ENOENT;
+       }
+
+       netdev_dbg(ctx->netdev, "%s: RXSC with sci %08llx, AN %u\n",
+                  __func__, sci_to_cpu(ctx->sa.rx_sa->sc->sci), ctx->sa.assoc_num);
+
+       return 0;
+}
+
+static int nsim_macsec_upd_rxsa(struct macsec_context *ctx)
+{
+       struct netdevsim *ns = netdev_priv(ctx->netdev);
+       struct nsim_secy *secy;
+       int idx;
+
+       idx = nsim_macsec_find_secy(ns, ctx->secy->sci);
+       if (idx < 0) {
+               netdev_err(ctx->netdev, "%s: sci %08llx not found in secy table\n",
+                          __func__, sci_to_cpu(ctx->secy->sci));
+               return -ENOENT;
+       }
+       secy = &ns->macsec.nsim_secy[idx];
+
+       idx = nsim_macsec_find_rxsc(secy, ctx->sa.rx_sa->sc->sci);
+       if (idx < 0) {
+               netdev_err(ctx->netdev, "%s: sci %08llx not found in RXSC table\n",
+                          __func__, sci_to_cpu(ctx->sa.rx_sa->sc->sci));
+               return -ENOENT;
+       }
+
+       netdev_dbg(ctx->netdev, "%s: RXSC with sci %08llx, AN %u\n",
+                  __func__, sci_to_cpu(ctx->sa.rx_sa->sc->sci), ctx->sa.assoc_num);
+
+       return 0;
+}
+
+static int nsim_macsec_del_rxsa(struct macsec_context *ctx)
+{
+       struct netdevsim *ns = netdev_priv(ctx->netdev);
+       struct nsim_secy *secy;
+       int idx;
+
+       idx = nsim_macsec_find_secy(ns, ctx->secy->sci);
+       if (idx < 0) {
+               netdev_err(ctx->netdev, "%s: sci %08llx not found in secy table\n",
+                          __func__, sci_to_cpu(ctx->secy->sci));
+               return -ENOENT;
+       }
+       secy = &ns->macsec.nsim_secy[idx];
+
+       idx = nsim_macsec_find_rxsc(secy, ctx->sa.rx_sa->sc->sci);
+       if (idx < 0) {
+               netdev_err(ctx->netdev, "%s: sci %08llx not found in RXSC table\n",
+                          __func__, sci_to_cpu(ctx->sa.rx_sa->sc->sci));
+               return -ENOENT;
+       }
+
+       netdev_dbg(ctx->netdev, "%s: RXSC with sci %08llx, AN %u\n",
+                  __func__, sci_to_cpu(ctx->sa.rx_sa->sc->sci), ctx->sa.assoc_num);
+
+       return 0;
+}
+
+static int nsim_macsec_add_txsa(struct macsec_context *ctx)
+{
+       struct netdevsim *ns = netdev_priv(ctx->netdev);
+       int idx;
+
+       idx = nsim_macsec_find_secy(ns, ctx->secy->sci);
+       if (idx < 0) {
+               netdev_err(ctx->netdev, "%s: sci %08llx not found in secy table\n",
+                          __func__, sci_to_cpu(ctx->secy->sci));
+               return -ENOENT;
+       }
+
+       netdev_dbg(ctx->netdev, "%s: SECY with sci %08llx, AN %u\n",
+                  __func__, sci_to_cpu(ctx->secy->sci), ctx->sa.assoc_num);
+
+       return 0;
+}
+
+static int nsim_macsec_upd_txsa(struct macsec_context *ctx)
+{
+       struct netdevsim *ns = netdev_priv(ctx->netdev);
+       int idx;
+
+       idx = nsim_macsec_find_secy(ns, ctx->secy->sci);
+       if (idx < 0) {
+               netdev_err(ctx->netdev, "%s: sci %08llx not found in secy table\n",
+                          __func__, sci_to_cpu(ctx->secy->sci));
+               return -ENOENT;
+       }
+
+       netdev_dbg(ctx->netdev, "%s: SECY with sci %08llx, AN %u\n",
+                  __func__, sci_to_cpu(ctx->secy->sci), ctx->sa.assoc_num);
+
+       return 0;
+}
+
+static int nsim_macsec_del_txsa(struct macsec_context *ctx)
+{
+       struct netdevsim *ns = netdev_priv(ctx->netdev);
+       int idx;
+
+       idx = nsim_macsec_find_secy(ns, ctx->secy->sci);
+       if (idx < 0) {
+               netdev_err(ctx->netdev, "%s: sci %08llx not found in secy table\n",
+                          __func__, sci_to_cpu(ctx->secy->sci));
+               return -ENOENT;
+       }
+
+       netdev_dbg(ctx->netdev, "%s: SECY with sci %08llx, AN %u\n",
+                  __func__, sci_to_cpu(ctx->secy->sci), ctx->sa.assoc_num);
+
+       return 0;
+}
+
+static const struct macsec_ops nsim_macsec_ops = {
+       .mdo_add_secy = nsim_macsec_add_secy,
+       .mdo_upd_secy = nsim_macsec_upd_secy,
+       .mdo_del_secy = nsim_macsec_del_secy,
+       .mdo_add_rxsc = nsim_macsec_add_rxsc,
+       .mdo_upd_rxsc = nsim_macsec_upd_rxsc,
+       .mdo_del_rxsc = nsim_macsec_del_rxsc,
+       .mdo_add_rxsa = nsim_macsec_add_rxsa,
+       .mdo_upd_rxsa = nsim_macsec_upd_rxsa,
+       .mdo_del_rxsa = nsim_macsec_del_rxsa,
+       .mdo_add_txsa = nsim_macsec_add_txsa,
+       .mdo_upd_txsa = nsim_macsec_upd_txsa,
+       .mdo_del_txsa = nsim_macsec_del_txsa,
+};
+
+void nsim_macsec_init(struct netdevsim *ns)
+{
+       ns->netdev->macsec_ops = &nsim_macsec_ops;
+       ns->netdev->features |= NETIF_F_HW_MACSEC;
+       memset(&ns->macsec, 0, sizeof(ns->macsec));
+}
+
+void nsim_macsec_teardown(struct netdevsim *ns)
+{
+}

diff --git a/drivers/net/netdevsim/netdev.c b/drivers/net/netdevsim/netdev.c
index 35fa1ca986715aec21be2b2d9ccdfb1c51ab7543..0c8daeb0d62b9bc1fedfa05e759e379a44866a44 100644 (file)
--- a/drivers/net/netdevsim/netdev.c
+++ b/drivers/net/netdevsim/netdev.c
@@ -304,6 +304,7 @@ static int nsim_init_netdevsim(struct netdevsim *ns)
        if (err)
                goto err_utn_destroy;
 
+       nsim_macsec_init(ns);
        nsim_ipsec_init(ns);
 
        err = register_netdevice(ns->netdev);
@@ -314,6 +315,7 @@ static int nsim_init_netdevsim(struct netdevsim *ns)
 
 err_ipsec_teardown:
        nsim_ipsec_teardown(ns);
+       nsim_macsec_teardown(ns);
        nsim_bpf_uninit(ns);
 err_utn_destroy:
        rtnl_unlock();
@@ -374,6 +376,7 @@ void nsim_destroy(struct netdevsim *ns)
        rtnl_lock();
        unregister_netdevice(dev);
        if (nsim_dev_port_is_pf(ns->nsim_dev_port)) {
+               nsim_macsec_teardown(ns);
                nsim_ipsec_teardown(ns);
                nsim_bpf_uninit(ns);
        }

diff --git a/drivers/net/netdevsim/netdevsim.h b/drivers/net/netdevsim/netdevsim.h
index 7d8ed8d8df5c990f7fde970b07e5729eaaac39ac..7be98b7dcca96201fa6458709d3ea6f6d5f0e2cc 100644 (file)
--- a/drivers/net/netdevsim/netdevsim.h
+++ b/drivers/net/netdevsim/netdevsim.h
@@ -23,6 +23,7 @@
 #include <net/devlink.h>
 #include <net/udp_tunnel.h>
 #include <net/xdp.h>
+#include <net/macsec.h>
 
 #define DRV_NAME       "netdevsim"
 
@@ -52,6 +53,25 @@ struct nsim_ipsec {
        u32 ok;
 };
 
+#define NSIM_MACSEC_MAX_SECY_COUNT 3
+#define NSIM_MACSEC_MAX_RXSC_COUNT 1
+struct nsim_rxsc {
+       sci_t sci;
+       bool used;
+};
+
+struct nsim_secy {
+       sci_t sci;
+       struct nsim_rxsc nsim_rxsc[NSIM_MACSEC_MAX_RXSC_COUNT];
+       u8 nsim_rxsc_count;
+       bool used;
+};
+
+struct nsim_macsec {
+       struct nsim_secy nsim_secy[NSIM_MACSEC_MAX_SECY_COUNT];
+       u8 nsim_secy_count;
+};
+
 struct nsim_ethtool_pauseparam {
        bool rx;
        bool tx;
@@ -93,6 +113,7 @@ struct netdevsim {
 
        bool bpf_map_accept;
        struct nsim_ipsec ipsec;
+       struct nsim_macsec macsec;
        struct {
                u32 inject_error;
                u32 sleep;
@@ -366,6 +387,19 @@ static inline bool nsim_ipsec_tx(struct netdevsim *ns, struct sk_buff *skb)
 }
 #endif
 
+#if IS_ENABLED(CONFIG_MACSEC)
+void nsim_macsec_init(struct netdevsim *ns);
+void nsim_macsec_teardown(struct netdevsim *ns);
+#else
+static inline void nsim_macsec_init(struct netdevsim *ns)
+{
+}
+
+static inline void nsim_macsec_teardown(struct netdevsim *ns)
+{
+}
+#endif
+
 struct nsim_bus_dev {
        struct device dev;
        struct list_head list;