diff options
author | Horatiu Vultur <horatiu.vultur@microchip.com> | 2022-11-23 23:31:37 +0300 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2022-11-25 13:38:10 +0300 |
commit | 560c7223d6e48171d5a34ca07f6c886d364bcbdf (patch) | |
tree | c3520e318ff0e004f7b22c906146f9a275c6749b /drivers | |
parent | 77ddda44411c36f6276616b9609a50ca98dc4d2c (diff) | |
download | linux-560c7223d6e48171d5a34ca07f6c886d364bcbdf.tar.xz |
net: lan966x: Update dma_dir of page_pool_params
To add support for XDP_TX it is required to be able to write to the DMA
area therefore it is required that the pages will be mapped using
DMA_BIDIRECTIONAL flag.
Therefore check if there are any xdp programs on the interfaces and in
that case set DMA_BIDRECTIONAL otherwise use DMA_FROM_DEVICE.
Therefore when a new XDP program is added it is required to redo the
page_pool.
Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/net/ethernet/microchip/lan966x/lan966x_fdma.c | 29 | ||||
-rw-r--r-- | drivers/net/ethernet/microchip/lan966x/lan966x_main.h | 2 | ||||
-rw-r--r-- | drivers/net/ethernet/microchip/lan966x/lan966x_xdp.c | 28 |
3 files changed, 53 insertions, 6 deletions
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_fdma.c b/drivers/net/ethernet/microchip/lan966x/lan966x_fdma.c index 3df3b3d29b4f..bc30c31c4360 100644 --- a/drivers/net/ethernet/microchip/lan966x/lan966x_fdma.c +++ b/drivers/net/ethernet/microchip/lan966x/lan966x_fdma.c @@ -79,6 +79,9 @@ static int lan966x_fdma_rx_alloc_page_pool(struct lan966x_rx *rx) SKB_DATA_ALIGN(sizeof(struct skb_shared_info)), }; + if (lan966x_xdp_present(lan966x)) + pp_params.dma_dir = DMA_BIDIRECTIONAL; + rx->page_pool = page_pool_create(&pp_params); for (int i = 0; i < lan966x->num_phys_ports; ++i) { @@ -826,16 +829,11 @@ static int lan966x_fdma_get_max_frame(struct lan966x *lan966x) XDP_PACKET_HEADROOM; } -int lan966x_fdma_change_mtu(struct lan966x *lan966x) +static int __lan966x_fdma_reload(struct lan966x *lan966x, int max_mtu) { - int max_mtu; int err; u32 val; - max_mtu = lan966x_fdma_get_max_frame(lan966x); - if (max_mtu == lan966x->rx.max_mtu) - return 0; - /* Disable the CPU port */ lan_rmw(QSYS_SW_PORT_MODE_PORT_ENA_SET(0), QSYS_SW_PORT_MODE_PORT_ENA, @@ -861,6 +859,25 @@ int lan966x_fdma_change_mtu(struct lan966x *lan966x) return err; } +int lan966x_fdma_change_mtu(struct lan966x *lan966x) +{ + int max_mtu; + + max_mtu = lan966x_fdma_get_max_frame(lan966x); + if (max_mtu == lan966x->rx.max_mtu) + return 0; + + return __lan966x_fdma_reload(lan966x, max_mtu); +} + +int lan966x_fdma_reload_page_pool(struct lan966x *lan966x) +{ + int max_mtu; + + max_mtu = lan966x_fdma_get_max_frame(lan966x); + return __lan966x_fdma_reload(lan966x, max_mtu); +} + void lan966x_fdma_netdev_init(struct lan966x *lan966x, struct net_device *dev) { if (lan966x->fdma_ndev) diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_main.h b/drivers/net/ethernet/microchip/lan966x/lan966x_main.h index c762e3732f88..81c0b11097ce 100644 --- a/drivers/net/ethernet/microchip/lan966x/lan966x_main.h +++ b/drivers/net/ethernet/microchip/lan966x/lan966x_main.h @@ -466,6 +466,7 @@ void lan966x_fdma_netdev_deinit(struct lan966x *lan966x, struct net_device *dev) int lan966x_fdma_init(struct lan966x *lan966x); void lan966x_fdma_deinit(struct lan966x *lan966x); irqreturn_t lan966x_fdma_irq_handler(int irq, void *args); +int lan966x_fdma_reload_page_pool(struct lan966x *lan966x); int lan966x_lag_port_join(struct lan966x_port *port, struct net_device *brport_dev, @@ -556,6 +557,7 @@ int lan966x_xdp(struct net_device *dev, struct netdev_bpf *xdp); int lan966x_xdp_run(struct lan966x_port *port, struct page *page, u32 data_len); +bool lan966x_xdp_present(struct lan966x *lan966x); static inline bool lan966x_xdp_port_present(struct lan966x_port *port) { return !!port->xdp_prog; diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_xdp.c b/drivers/net/ethernet/microchip/lan966x/lan966x_xdp.c index 8ebde1eb6a09..ba7aa6df9d0e 100644 --- a/drivers/net/ethernet/microchip/lan966x/lan966x_xdp.c +++ b/drivers/net/ethernet/microchip/lan966x/lan966x_xdp.c @@ -11,6 +11,8 @@ static int lan966x_xdp_setup(struct net_device *dev, struct netdev_bpf *xdp) struct lan966x_port *port = netdev_priv(dev); struct lan966x *lan966x = port->lan966x; struct bpf_prog *old_prog; + bool old_xdp, new_xdp; + int err; if (!lan966x->fdma) { NL_SET_ERR_MSG_MOD(xdp->extack, @@ -18,7 +20,20 @@ static int lan966x_xdp_setup(struct net_device *dev, struct netdev_bpf *xdp) return -EOPNOTSUPP; } + old_xdp = lan966x_xdp_present(lan966x); old_prog = xchg(&port->xdp_prog, xdp->prog); + new_xdp = lan966x_xdp_present(lan966x); + + if (old_xdp == new_xdp) + goto out; + + err = lan966x_fdma_reload_page_pool(lan966x); + if (err) { + xchg(&port->xdp_prog, old_prog); + return err; + } + +out: if (old_prog) bpf_prog_put(old_prog); @@ -62,6 +77,19 @@ int lan966x_xdp_run(struct lan966x_port *port, struct page *page, u32 data_len) } } +bool lan966x_xdp_present(struct lan966x *lan966x) +{ + for (int p = 0; p < lan966x->num_phys_ports; ++p) { + if (!lan966x->ports[p]) + continue; + + if (lan966x_xdp_port_present(lan966x->ports[p])) + return true; + } + + return false; +} + int lan966x_xdp_port_init(struct lan966x_port *port) { struct lan966x *lan966x = port->lan966x; |