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Commit 9ce7a956 authored by Jakub Kicinski's avatar Jakub Kicinski Committed by David S. Miller
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nfp: bpf: refactor offload logic 



We currently create a fake cls_bpf offload object when we want
to offload XDP.  Simplify and clarify the code by moving the
TC/XDP specific logic out of common offload code.  This is easy
now that we don't support legacy TC actions.  We only need the
bpf program and state of the skip_sw flag.

Temporarily set @code to NULL in nfp_net_bpf_offload(), compilers
seem to have trouble recognizing it's always initialized.  Next
patches will eliminate that variable.

Signed-off-by: default avatarJakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: default avatarQuentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 5559eedb

drivers/net/ethernet/netronome/nfp/bpf/main.c

+35 −32
Original line number Diff line number Diff line
@@ -54,28 +54,25 @@ static int 
nfp_bpf_xdp_offload(struct nfp_app *app, struct nfp_net *nn,

		    struct bpf_prog *prog)

{

	struct tc_cls_bpf_offload cmd = {

		.prog = prog,

	};

	bool running, xdp_running;

	int ret;



	if (!nfp_net_ebpf_capable(nn))

		return -EINVAL;



	if (nn->dp.ctrl & NFP_NET_CFG_CTRL_BPF) {

		if (!nn->dp.bpf_offload_xdp)

			return prog ? -EBUSY : 0;

		cmd.command = prog ? TC_CLSBPF_REPLACE : TC_CLSBPF_DESTROY;

	} else {

		if (!prog)

	running = nn->dp.ctrl & NFP_NET_CFG_CTRL_BPF;

	xdp_running = running && nn->dp.bpf_offload_xdp;



	if (!prog && !xdp_running)

		return 0;

		cmd.command = TC_CLSBPF_ADD;

	}

	if (prog && running && !xdp_running)

		return -EBUSY;



	ret = nfp_net_bpf_offload(nn, &cmd);

	ret = nfp_net_bpf_offload(nn, prog, running, true);

	/* Stop offload if replace not possible */

	if (ret && cmd.command == TC_CLSBPF_REPLACE)

	if (ret && prog)

		nfp_bpf_xdp_offload(app, nn, NULL);



	nn->dp.bpf_offload_xdp = prog && !ret;

	return ret;

}
@@ -96,13 +93,11 @@ static int nfp_bpf_setup_tc_block_cb(enum tc_setup_type type, 
{

	struct tc_cls_bpf_offload *cls_bpf = type_data;

	struct nfp_net *nn = cb_priv;

	bool skip_sw;



	if (!tc_can_offload(nn->dp.netdev))

		return -EOPNOTSUPP;



	switch (type) {

	case TC_SETUP_CLSBPF:

		if (!nfp_net_ebpf_capable(nn) ||

	if (type != TC_SETUP_CLSBPF ||

	    !tc_can_offload(nn->dp.netdev) ||

	    !nfp_net_ebpf_capable(nn) ||

	    cls_bpf->common.protocol != htons(ETH_P_ALL) ||

	    cls_bpf->common.chain_index)

		return -EOPNOTSUPP;
@@ -116,7 +111,15 @@ static int nfp_bpf_setup_tc_block_cb(enum tc_setup_type type, 
		return -EOPNOTSUPP;

	}



		return nfp_net_bpf_offload(nn, cls_bpf);

	skip_sw = !!(cls_bpf->gen_flags & TCA_CLS_FLAGS_SKIP_SW);



	switch (cls_bpf->command) {

	case TC_CLSBPF_REPLACE:

		return nfp_net_bpf_offload(nn, cls_bpf->prog, true, !skip_sw);

	case TC_CLSBPF_ADD:

		return nfp_net_bpf_offload(nn, cls_bpf->prog, false, !skip_sw);

	case TC_CLSBPF_DESTROY:

		return nfp_net_bpf_offload(nn, NULL, true, !skip_sw);

	default:

		return -EOPNOTSUPP;

	}

drivers/net/ethernet/netronome/nfp/bpf/main.h

+2 −2
Original line number Diff line number Diff line
@@ -181,8 +181,8 @@ nfp_bpf_jit(struct bpf_prog *filter, void *prog, 
int nfp_prog_verify(struct nfp_prog *nfp_prog, struct bpf_prog *prog);



struct nfp_net;

struct tc_cls_bpf_offload;



int nfp_net_bpf_offload(struct nfp_net *nn, struct tc_cls_bpf_offload *cls_bpf);

int nfp_net_bpf_offload(struct nfp_net *nn, struct bpf_prog *prog,

			bool old_prog, bool sw_fallback);



#endif

drivers/net/ethernet/netronome/nfp/bpf/offload.c

+30 −43
Original line number Diff line number Diff line
@@ -52,8 +52,7 @@ 
#include "../nfp_net.h"



static int

nfp_net_bpf_offload_prepare(struct nfp_net *nn,

			    struct tc_cls_bpf_offload *cls_bpf,

nfp_net_bpf_offload_prepare(struct nfp_net *nn, struct bpf_prog *prog,

			    struct nfp_bpf_result *res,

			    void **code, dma_addr_t *dma_addr, u16 max_instr)

{
@@ -73,9 +72,9 @@ nfp_net_bpf_offload_prepare(struct nfp_net *nn, 
	done_off = nn_readw(nn, NFP_NET_CFG_BPF_DONE);



	stack_size = nn_readb(nn, NFP_NET_CFG_BPF_STACK_SZ) * 64;

	if (cls_bpf->prog->aux->stack_depth > stack_size) {

	if (prog->aux->stack_depth > stack_size) {

		nn_info(nn, "stack too large: program %dB > FW stack %dB\n",

			cls_bpf->prog->aux->stack_depth, stack_size);

			prog->aux->stack_depth, stack_size);

		return -EOPNOTSUPP;

	}
@@ -83,8 +82,7 @@ nfp_net_bpf_offload_prepare(struct nfp_net *nn, 
	if (!*code)

		return -ENOMEM;



	ret = nfp_bpf_jit(cls_bpf->prog, *code, start_off, done_off,

			  max_instr, res);

	ret = nfp_bpf_jit(prog, *code, start_off, done_off, max_instr, res);

	if (ret)

		goto out;
@@ -96,13 +94,13 @@ nfp_net_bpf_offload_prepare(struct nfp_net *nn, 
}



static void

nfp_net_bpf_load_and_start(struct nfp_net *nn, u32 tc_flags,

nfp_net_bpf_load_and_start(struct nfp_net *nn, bool sw_fallback,

			   void *code, dma_addr_t dma_addr,

			   unsigned int code_sz, unsigned int n_instr)

{

	int err;



	nn->dp.bpf_offload_skip_sw = !!(tc_flags & TCA_CLS_FLAGS_SKIP_SW);

	nn->dp.bpf_offload_skip_sw = !sw_fallback;



	nn_writew(nn, NFP_NET_CFG_BPF_SIZE, n_instr);

	nn_writeq(nn, NFP_NET_CFG_BPF_ADDR, dma_addr);
@@ -134,7 +132,8 @@ static int nfp_net_bpf_stop(struct nfp_net *nn) 
	return nfp_net_reconfig(nn, NFP_NET_CFG_UPDATE_GEN);

}



int nfp_net_bpf_offload(struct nfp_net *nn, struct tc_cls_bpf_offload *cls_bpf)

int nfp_net_bpf_offload(struct nfp_net *nn, struct bpf_prog *prog,

			bool old_prog, bool sw_fallback)

{

	struct nfp_bpf_result res;

	dma_addr_t dma_addr;
@@ -142,10 +141,6 @@ int nfp_net_bpf_offload(struct nfp_net *nn, struct tc_cls_bpf_offload *cls_bpf) 
	void *code;

	int err;



	max_instr = nn_readw(nn, NFP_NET_CFG_BPF_MAX_LEN);



	switch (cls_bpf->command) {

	case TC_CLSBPF_REPLACE:

	/* There is nothing stopping us from implementing seamless

	 * replace but the simple method of loading I adopted in

	 * the firmware does not handle atomic replace (i.e. we have to
@@ -153,38 +148,30 @@ int nfp_net_bpf_offload(struct nfp_net *nn, struct tc_cls_bpf_offload *cls_bpf) 
	 * frames which didn't have BPF applied in the hardware should

	 * be fine if software fallback is available, though.

	 */

		if (nn->dp.bpf_offload_skip_sw)

	if (prog && old_prog && nn->dp.bpf_offload_skip_sw)

		return -EBUSY;



		err = nfp_net_bpf_offload_prepare(nn, cls_bpf, &res, &code,

						  &dma_addr, max_instr);

		if (err)

			return err;



		nfp_net_bpf_stop(nn);

		nfp_net_bpf_load_and_start(nn, cls_bpf->gen_flags, code,

					   dma_addr, max_instr * sizeof(u64),

					   res.n_instr);

		return 0;



	case TC_CLSBPF_ADD:

		if (nn->dp.ctrl & NFP_NET_CFG_CTRL_BPF)

	/* Something else is loaded, different program type? */

	if (!old_prog && nn->dp.ctrl & NFP_NET_CFG_CTRL_BPF)

		return -EBUSY;



		err = nfp_net_bpf_offload_prepare(nn, cls_bpf, &res, &code,

	max_instr = nn_readw(nn, NFP_NET_CFG_BPF_MAX_LEN);

	code = NULL;



	if (prog) {

		err = nfp_net_bpf_offload_prepare(nn, prog, &res, &code,

						  &dma_addr, max_instr);

		if (err)

			return err;

	}



	if (old_prog)

		nfp_net_bpf_stop(nn);



		nfp_net_bpf_load_and_start(nn, cls_bpf->gen_flags, code,

	if (prog)

		nfp_net_bpf_load_and_start(nn, sw_fallback, code,

					   dma_addr, max_instr * sizeof(u64),

					   res.n_instr);

		return 0;



	case TC_CLSBPF_DESTROY:

		return nfp_net_bpf_stop(nn);



	default:

		return -EOPNOTSUPP;

	}

	return 0;

}