diff options
Diffstat (limited to 'drivers/net/ethernet/microchip/vcap/vcap_api.c')
| -rw-r--r-- | drivers/net/ethernet/microchip/vcap/vcap_api.c | 772 |
1 files changed, 772 insertions, 0 deletions
diff --git a/drivers/net/ethernet/microchip/vcap/vcap_api.c b/drivers/net/ethernet/microchip/vcap/vcap_api.c index f2435d7ab515..27128313f15f 100644 --- a/drivers/net/ethernet/microchip/vcap/vcap_api.c +++ b/drivers/net/ethernet/microchip/vcap/vcap_api.c @@ -169,6 +169,227 @@ static void vcap_encode_typegroups(u32 *stream, int sw_width, } } +static bool vcap_bitarray_zero(int width, u8 *value) +{ + int bytes = DIV_ROUND_UP(width, BITS_PER_BYTE); + u8 total = 0, bmask = 0xff; + int rwidth = width; + int idx; + + for (idx = 0; idx < bytes; ++idx, rwidth -= BITS_PER_BYTE) { + if (rwidth && rwidth < BITS_PER_BYTE) + bmask = (1 << rwidth) - 1; + total += value[idx] & bmask; + } + return total == 0; +} + +static bool vcap_get_bit(u32 *stream, struct vcap_stream_iter *itr) +{ + u32 mask = BIT(itr->reg_bitpos); + u32 *p = &stream[itr->reg_idx]; + + return !!(*p & mask); +} + +static void vcap_decode_field(u32 *stream, struct vcap_stream_iter *itr, + int width, u8 *value) +{ + int idx; + + /* Loop over the field value bits and get the field bits and + * set them in the output value byte array + */ + for (idx = 0; idx < width; idx++) { + u8 bidx = idx & 0x7; + + /* Decode one field value bit */ + if (vcap_get_bit(stream, itr)) + *value |= 1 << bidx; + vcap_iter_next(itr); + if (bidx == 7) + value++; + } +} + +/* Verify that the type id in the stream matches the type id of the keyset */ +static bool vcap_verify_keystream_keyset(struct vcap_control *vctrl, + enum vcap_type vt, + u32 *keystream, + u32 *mskstream, + enum vcap_keyfield_set keyset) +{ + const struct vcap_info *vcap = &vctrl->vcaps[vt]; + const struct vcap_field *typefld; + const struct vcap_typegroup *tgt; + const struct vcap_field *fields; + struct vcap_stream_iter iter; + const struct vcap_set *info; + u32 value = 0; + u32 mask = 0; + + if (vcap_keyfield_count(vctrl, vt, keyset) == 0) + return false; + + info = vcap_keyfieldset(vctrl, vt, keyset); + /* Check that the keyset is valid */ + if (!info) + return false; + + /* a type_id of value -1 means that there is no type field */ + if (info->type_id == (u8)-1) + return true; + + /* Get a valid typegroup for the specific keyset */ + tgt = vcap_keyfield_typegroup(vctrl, vt, keyset); + if (!tgt) + return false; + + fields = vcap_keyfields(vctrl, vt, keyset); + if (!fields) + return false; + + typefld = &fields[VCAP_KF_TYPE]; + vcap_iter_init(&iter, vcap->sw_width, tgt, typefld->offset); + vcap_decode_field(mskstream, &iter, typefld->width, (u8 *)&mask); + /* no type info if there are no mask bits */ + if (vcap_bitarray_zero(typefld->width, (u8 *)&mask)) + return false; + + /* Get the value of the type field in the stream and compare to the + * one define in the vcap keyset + */ + vcap_iter_init(&iter, vcap->sw_width, tgt, typefld->offset); + vcap_decode_field(keystream, &iter, typefld->width, (u8 *)&value); + + return (value & mask) == (info->type_id & mask); +} + +/* Verify that the typegroup bits have the correct values */ +static int vcap_verify_typegroups(u32 *stream, int sw_width, + const struct vcap_typegroup *tgt, bool mask, + int sw_max) +{ + struct vcap_stream_iter iter; + int sw_cnt, idx; + + vcap_iter_set(&iter, sw_width, tgt, 0); + sw_cnt = 0; + while (iter.tg->width) { + u32 value = 0; + u32 tg_value = iter.tg->value; + + if (mask) + tg_value = (1 << iter.tg->width) - 1; + /* Set position to current typegroup bit */ + iter.offset = iter.tg->offset; + vcap_iter_update(&iter); + for (idx = 0; idx < iter.tg->width; idx++) { + /* Decode one typegroup bit */ + if (vcap_get_bit(stream, &iter)) + value |= 1 << idx; + iter.offset++; + vcap_iter_update(&iter); + } + if (value != tg_value) + return -EINVAL; + iter.tg++; /* next typegroup */ + sw_cnt++; + /* Stop checking more typegroups */ + if (sw_max && sw_cnt >= sw_max) + break; + } + return 0; +} + +/* Find the subword width of the key typegroup that matches the stream data */ +static int vcap_find_keystream_typegroup_sw(struct vcap_control *vctrl, + enum vcap_type vt, u32 *stream, + bool mask, int sw_max) +{ + const struct vcap_typegroup **tgt; + int sw_idx, res; + + tgt = vctrl->vcaps[vt].keyfield_set_typegroups; + /* Try the longest subword match first */ + for (sw_idx = vctrl->vcaps[vt].sw_count; sw_idx >= 0; sw_idx--) { + if (!tgt[sw_idx]) + continue; + + res = vcap_verify_typegroups(stream, vctrl->vcaps[vt].sw_width, + tgt[sw_idx], mask, sw_max); + if (res == 0) + return sw_idx; + } + return -EINVAL; +} + +/* Verify that the typegroup information, subword count, keyset and type id + * are in sync and correct, return the list of matchin keysets + */ +int +vcap_find_keystream_keysets(struct vcap_control *vctrl, + enum vcap_type vt, + u32 *keystream, + u32 *mskstream, + bool mask, int sw_max, + struct vcap_keyset_list *kslist) +{ + const struct vcap_set *keyfield_set; + int sw_count, idx; + + sw_count = vcap_find_keystream_typegroup_sw(vctrl, vt, keystream, mask, + sw_max); + if (sw_count < 0) + return sw_count; + + keyfield_set = vctrl->vcaps[vt].keyfield_set; + for (idx = 0; idx < vctrl->vcaps[vt].keyfield_set_size; ++idx) { + if (keyfield_set[idx].sw_per_item != sw_count) + continue; + + if (vcap_verify_keystream_keyset(vctrl, vt, keystream, + mskstream, idx)) + vcap_keyset_list_add(kslist, idx); + } + if (kslist->cnt > 0) + return 0; + return -EINVAL; +} +EXPORT_SYMBOL_GPL(vcap_find_keystream_keysets); + +/* Read key data from a VCAP address and discover if there are any rule keysets + * here + */ +int vcap_addr_keysets(struct vcap_control *vctrl, + struct net_device *ndev, + struct vcap_admin *admin, + int addr, + struct vcap_keyset_list *kslist) +{ + enum vcap_type vt = admin->vtype; + int keyset_sw_regs, idx; + u32 key = 0, mask = 0; + + /* Read the cache at the specified address */ + keyset_sw_regs = DIV_ROUND_UP(vctrl->vcaps[vt].sw_width, 32); + vctrl->ops->update(ndev, admin, VCAP_CMD_READ, VCAP_SEL_ALL, addr); + vctrl->ops->cache_read(ndev, admin, VCAP_SEL_ENTRY, 0, + keyset_sw_regs); + /* Skip uninitialized key/mask entries */ + for (idx = 0; idx < keyset_sw_regs; ++idx) { + key |= ~admin->cache.keystream[idx]; + mask |= admin->cache.maskstream[idx]; + } + if (key == 0 && mask == 0) + return -EINVAL; + /* Decode and locate the keysets */ + return vcap_find_keystream_keysets(vctrl, vt, admin->cache.keystream, + admin->cache.maskstream, false, 0, + kslist); +} +EXPORT_SYMBOL_GPL(vcap_addr_keysets); + /* Return the list of keyfields for the keyset */ const struct vcap_field *vcap_keyfields(struct vcap_control *vctrl, enum vcap_type vt, @@ -618,6 +839,517 @@ struct vcap_rule_internal *vcap_dup_rule(struct vcap_rule_internal *ri) return duprule; } +static void vcap_apply_width(u8 *dst, int width, int bytes) +{ + u8 bmask; + int idx; + + for (idx = 0; idx < bytes; idx++) { + if (width > 0) + if (width < 8) + bmask = (1 << width) - 1; + else + bmask = ~0; + else + bmask = 0; + dst[idx] &= bmask; + width -= 8; + } +} + +static void vcap_copy_from_w32be(u8 *dst, u8 *src, int size, int width) +{ + int idx, ridx, wstart, nidx; + int tail_bytes = (((size + 4) >> 2) << 2) - size; + + for (idx = 0, ridx = size - 1; idx < size; ++idx, --ridx) { + wstart = (idx >> 2) << 2; + nidx = wstart + 3 - (idx & 0x3); + if (nidx >= size) + nidx -= tail_bytes; + dst[nidx] = src[ridx]; + } + + vcap_apply_width(dst, width, size); +} + +static void vcap_copy_action_bit_field(struct vcap_u1_action *field, u8 *value) +{ + field->value = (*value) & 0x1; +} + +static void vcap_copy_limited_actionfield(u8 *dstvalue, u8 *srcvalue, + int width, int bytes) +{ + memcpy(dstvalue, srcvalue, bytes); + vcap_apply_width(dstvalue, width, bytes); +} + +static void vcap_copy_to_client_actionfield(struct vcap_rule_internal *ri, + struct vcap_client_actionfield *field, + u8 *value, u16 width) +{ + int field_size = actionfield_size_table[field->ctrl.type]; + + if (ri->admin->w32be) { + switch (field->ctrl.type) { + case VCAP_FIELD_BIT: + vcap_copy_action_bit_field(&field->data.u1, value); + break; + case VCAP_FIELD_U32: + vcap_copy_limited_actionfield((u8 *)&field->data.u32.value, + value, + width, field_size); + break; + case VCAP_FIELD_U48: + vcap_copy_from_w32be(field->data.u48.value, value, + field_size, width); + break; + case VCAP_FIELD_U56: + vcap_copy_from_w32be(field->data.u56.value, value, + field_size, width); + break; + case VCAP_FIELD_U64: + vcap_copy_from_w32be(field->data.u64.value, value, + field_size, width); + break; + case VCAP_FIELD_U72: + vcap_copy_from_w32be(field->data.u72.value, value, + field_size, width); + break; + case VCAP_FIELD_U112: + vcap_copy_from_w32be(field->data.u112.value, value, + field_size, width); + break; + case VCAP_FIELD_U128: + vcap_copy_from_w32be(field->data.u128.value, value, + field_size, width); + break; + }; + } else { + switch (field->ctrl.type) { + case VCAP_FIELD_BIT: + vcap_copy_action_bit_field(&field->data.u1, value); + break; + case VCAP_FIELD_U32: + vcap_copy_limited_actionfield((u8 *)&field->data.u32.value, + value, + width, field_size); + break; + case VCAP_FIELD_U48: + vcap_copy_limited_actionfield(field->data.u48.value, + value, + width, field_size); + break; + case VCAP_FIELD_U56: + vcap_copy_limited_actionfield(field->data.u56.value, + value, + width, field_size); + break; + case VCAP_FIELD_U64: + vcap_copy_limited_actionfield(field->data.u64.value, + value, + width, field_size); + break; + case VCAP_FIELD_U72: + vcap_copy_limited_actionfield(field->data.u72.value, + value, + width, field_size); + break; + case VCAP_FIELD_U112: + vcap_copy_limited_actionfield(field->data.u112.value, + value, + width, field_size); + break; + case VCAP_FIELD_U128: + vcap_copy_limited_actionfield(field->data.u128.value, + value, + width, field_size); + break; + }; + } +} + +static void vcap_copy_key_bit_field(struct vcap_u1_key *field, + u8 *value, u8 *mask) +{ + field->value = (*value) & 0x1; + field->mask = (*mask) & 0x1; +} + +static void vcap_copy_limited_keyfield(u8 *dstvalue, u8 *dstmask, + u8 *srcvalue, u8 *srcmask, + int width, int bytes) +{ + memcpy(dstvalue, srcvalue, bytes); + vcap_apply_width(dstvalue, width, bytes); + memcpy(dstmask, srcmask, bytes); + vcap_apply_width(dstmask, width, bytes); +} + +static void vcap_copy_to_client_keyfield(struct vcap_rule_internal *ri, + struct vcap_client_keyfield *field, + u8 *value, u8 *mask, u16 width) +{ + int field_size = keyfield_size_table[field->ctrl.type] / 2; + + if (ri->admin->w32be) { + switch (field->ctrl.type) { + case VCAP_FIELD_BIT: + vcap_copy_key_bit_field(&field->data.u1, value, mask); + break; + case VCAP_FIELD_U32: + vcap_copy_limited_keyfield((u8 *)&field->data.u32.value, + (u8 *)&field->data.u32.mask, + value, mask, + width, field_size); + break; + case VCAP_FIELD_U48: + vcap_copy_from_w32be(field->data.u48.value, value, + field_size, width); + vcap_copy_from_w32be(field->data.u48.mask, mask, + field_size, width); + break; + case VCAP_FIELD_U56: + vcap_copy_from_w32be(field->data.u56.value, value, + field_size, width); + vcap_copy_from_w32be(field->data.u56.mask, mask, + field_size, width); + break; + case VCAP_FIELD_U64: + vcap_copy_from_w32be(field->data.u64.value, value, + field_size, width); + vcap_copy_from_w32be(field->data.u64.mask, mask, + field_size, width); + break; + case VCAP_FIELD_U72: + vcap_copy_from_w32be(field->data.u72.value, value, + field_size, width); + vcap_copy_from_w32be(field->data.u72.mask, mask, + field_size, width); + break; + case VCAP_FIELD_U112: + vcap_copy_from_w32be(field->data.u112.value, value, + field_size, width); + vcap_copy_from_w32be(field->data.u112.mask, mask, + field_size, width); + break; + case VCAP_FIELD_U128: + vcap_copy_from_w32be(field->data.u128.value, value, + field_size, width); + vcap_copy_from_w32be(field->data.u128.mask, mask, + field_size, width); + break; + }; + } else { + switch (field->ctrl.type) { + case VCAP_FIELD_BIT: + vcap_copy_key_bit_field(&field->data.u1, value, mask); + break; + case VCAP_FIELD_U32: + vcap_copy_limited_keyfield((u8 *)&field->data.u32.value, + (u8 *)&field->data.u32.mask, + value, mask, + width, field_size); + break; + case VCAP_FIELD_U48: + vcap_copy_limited_keyfield(field->data.u48.value, + field->data.u48.mask, + value, mask, + width, field_size); + break; + case VCAP_FIELD_U56: + vcap_copy_limited_keyfield(field->data.u56.value, + field->data.u56.mask, + value, mask, + width, field_size); + break; + case VCAP_FIELD_U64: + vcap_copy_limited_keyfield(field->data.u64.value, + field->data.u64.mask, + value, mask, + width, field_size); + break; + case VCAP_FIELD_U72: + vcap_copy_limited_keyfield(field->data.u72.value, + field->data.u72.mask, + value, mask, + width, field_size); + break; + case VCAP_FIELD_U112: + vcap_copy_limited_keyfield(field->data.u112.value, + field->data.u112.mask, + value, mask, + width, field_size); + break; + case VCAP_FIELD_U128: + vcap_copy_limited_keyfield(field->data.u128.value, + field->data.u128.mask, + value, mask, + width, field_size); + break; + }; + } +} + +static void vcap_rule_alloc_keyfield(struct vcap_rule_internal *ri, + const struct vcap_field *keyfield, + enum vcap_key_field key, + u8 *value, u8 *mask) +{ + struct vcap_client_keyfield *field; + + field = kzalloc(sizeof(*field), GFP_KERNEL); + if (!field) + return; + INIT_LIST_HEAD(&field->ctrl.list); + field->ctrl.key = key; + field->ctrl.type = keyfield->type; + vcap_copy_to_client_keyfield(ri, field, value, mask, keyfield->width); + list_add_tail(&field->ctrl.list, &ri->data.keyfields); +} + +/* Read key data from a VCAP address and discover if there is a rule keyset + * here + */ +static bool +vcap_verify_actionstream_actionset(struct vcap_control *vctrl, + enum vcap_type vt, + u32 *actionstream, + enum vcap_actionfield_set actionset) +{ + const struct vcap_typegroup *tgt; + const struct vcap_field *fields; + const struct vcap_set *info; + + if (vcap_actionfield_count(vctrl, vt, actionset) == 0) + return false; + + info = vcap_actionfieldset(vctrl, vt, actionset); + /* Check that the actionset is valid */ + if (!info) + return false; + + /* a type_id of value -1 means that there is no type field */ + if (info->type_id == (u8)-1) + return true; + + /* Get a valid typegroup for the specific actionset */ + tgt = vcap_actionfield_typegroup(vctrl, vt, actionset); + if (!tgt) + return false; + + fields = vcap_actionfields(vctrl, vt, actionset); + if (!fields) + return false; + + /* Later this will be expanded with a check of the type id */ + return true; +} + +/* Find the subword width of the action typegroup that matches the stream data + */ +static int vcap_find_actionstream_typegroup_sw(struct vcap_control *vctrl, + enum vcap_type vt, u32 *stream, + int sw_max) +{ + const struct vcap_typegroup **tgt; + int sw_idx, res; + + tgt = vctrl->vcaps[vt].actionfield_set_typegroups; + /* Try the longest subword match first */ + for (sw_idx = vctrl->vcaps[vt].sw_count; sw_idx >= 0; sw_idx--) { + if (!tgt[sw_idx]) + continue; + res = vcap_verify_typegroups(stream, vctrl->vcaps[vt].act_width, + tgt[sw_idx], false, sw_max); + if (res == 0) + return sw_idx; + } + return -EINVAL; +} + +/* Verify that the typegroup information, subword count, actionset and type id + * are in sync and correct, return the actionset + */ +static enum vcap_actionfield_set +vcap_find_actionstream_actionset(struct vcap_control *vctrl, + enum vcap_type vt, + u32 *stream, + int sw_max) +{ + const struct vcap_set *actionfield_set; + int sw_count, idx; + bool res; + + sw_count = vcap_find_actionstream_typegroup_sw(vctrl, vt, stream, + sw_max); + if (sw_count < 0) + return sw_count; + + actionfield_set = vctrl->vcaps[vt].actionfield_set; + for (idx = 0; idx < vctrl->vcaps[vt].actionfield_set_size; ++idx) { + if (actionfield_set[idx].sw_per_item != sw_count) + continue; + + res = vcap_verify_actionstream_actionset(vctrl, vt, + stream, idx); + if (res) + return idx; + } + return -EINVAL; +} + +/* Store action value in an element in a list for the client */ +static void vcap_rule_alloc_actionfield(struct vcap_rule_internal *ri, + const struct vcap_field *actionfield, + enum vcap_action_field action, + u8 *value) +{ + struct vcap_client_actionfield *field; + + field = kzalloc(sizeof(*field), GFP_KERNEL); + if (!field) + return; + INIT_LIST_HEAD(&field->ctrl.list); + field->ctrl.action = action; + field->ctrl.type = actionfield->type; + vcap_copy_to_client_actionfield(ri, field, value, actionfield->width); + list_add_tail(&field->ctrl.list, &ri->data.actionfields); +} + +static int vcap_decode_actionset(struct vcap_rule_internal *ri) +{ + struct vcap_control *vctrl = ri->vctrl; + struct vcap_admin *admin = ri->admin; + const struct vcap_field *actionfield; + enum vcap_actionfield_set actionset; + enum vcap_type vt = admin->vtype; + const struct vcap_typegroup *tgt; + struct vcap_stream_iter iter; + int idx, res, actfield_count; + u32 *actstream; + u8 value[16]; + + actstream = admin->cache.actionstream; + res = vcap_find_actionstream_actionset(vctrl, vt, actstream, 0); + if (res < 0) { + pr_err("%s:%d: could not find valid actionset: %d\n", + __func__, __LINE__, res); + return -EINVAL; + } + actionset = res; + actfield_count = vcap_actionfield_count(vctrl, vt, actionset); + actionfield = vcap_actionfields(vctrl, vt, actionset); + tgt = vcap_actionfield_typegroup(vctrl, vt, actionset); + /* Start decoding the stream */ + for (idx = 0; idx < actfield_count; ++idx) { + if (actionfield[idx].width <= 0) + continue; + /* Get the action */ + memset(value, 0, DIV_ROUND_UP(actionfield[idx].width, 8)); + vcap_iter_init(&iter, vctrl->vcaps[vt].act_width, tgt, + actionfield[idx].offset); + vcap_decode_field(actstream, &iter, actionfield[idx].width, + value); + /* Skip if no bits are set */ + if (vcap_bitarray_zero(actionfield[idx].width, value)) + continue; + vcap_rule_alloc_actionfield(ri, &actionfield[idx], idx, value); + /* Later the action id will also be checked */ + } + return vcap_set_rule_set_actionset((struct vcap_rule *)ri, actionset); +} + +static int vcap_decode_keyset(struct vcap_rule_internal *ri) +{ + struct vcap_control *vctrl = ri->vctrl; + struct vcap_stream_iter kiter, miter; + struct vcap_admin *admin = ri->admin; + enum vcap_keyfield_set keysets[10]; + const struct vcap_field *keyfield; + enum vcap_type vt = admin->vtype; + const struct vcap_typegroup *tgt; + struct vcap_keyset_list matches; + enum vcap_keyfield_set keyset; + int idx, res, keyfield_count; + u32 *maskstream; + u32 *keystream; + u8 value[16]; + u8 mask[16]; + + keystream = admin->cache.keystream; + maskstream = admin->cache.maskstream; + matches.keysets = keysets; + matches.cnt = 0; + matches.max = ARRAY_SIZE(keysets); + res = vcap_find_keystream_keysets(vctrl, vt, keystream, maskstream, + false, 0, &matches); + if (res < 0) { + pr_err("%s:%d: could not find valid keysets: %d\n", + __func__, __LINE__, res); + return -EINVAL; + } + keyset = matches.keysets[0]; + keyfield_count = vcap_keyfield_count(vctrl, vt, keyset); + keyfield = vcap_keyfields(vctrl, vt, keyset); + tgt = vcap_keyfield_typegroup(vctrl, vt, keyset); + /* Start decoding the streams */ + for (idx = 0; idx < keyfield_count; ++idx) { + if (keyfield[idx].width <= 0) + continue; + /* First get the mask */ + memset(mask, 0, DIV_ROUND_UP(keyfield[idx].width, 8)); + vcap_iter_init(&miter, vctrl->vcaps[vt].sw_width, tgt, + keyfield[idx].offset); + vcap_decode_field(maskstream, &miter, keyfield[idx].width, + mask); + /* Skip if no mask bits are set */ + if (vcap_bitarray_zero(keyfield[idx].width, mask)) + continue; + /* Get the key */ + memset(value, 0, DIV_ROUND_UP(keyfield[idx].width, 8)); + vcap_iter_init(&kiter, vctrl->vcaps[vt].sw_width, tgt, + keyfield[idx].offset); + vcap_decode_field(keystream, &kiter, keyfield[idx].width, + value); + vcap_rule_alloc_keyfield(ri, &keyfield[idx], idx, value, mask); + } + return vcap_set_rule_set_keyset((struct vcap_rule *)ri, keyset); +} + +/* Read VCAP content into the VCAP cache */ +static int vcap_read_rule(struct vcap_rule_internal *ri) +{ + struct vcap_admin *admin = ri->admin; + int sw_idx, ent_idx = 0, act_idx = 0; + u32 addr = ri->addr; + + if (!ri->size || !ri->keyset_sw_regs || !ri->actionset_sw_regs) { + pr_err("%s:%d: rule is empty\n", __func__, __LINE__); + return -EINVAL; + } + vcap_erase_cache(ri); + /* Use the values in the streams to read the VCAP cache */ + for (sw_idx = 0; sw_idx < ri->size; sw_idx++, addr++) { + ri->vctrl->ops->update(ri->ndev, admin, VCAP_CMD_READ, + VCAP_SEL_ALL, addr); + ri->vctrl->ops->cache_read(ri->ndev, admin, + VCAP_SEL_ENTRY, ent_idx, + ri->keyset_sw_regs); + ri->vctrl->ops->cache_read(ri->ndev, admin, + VCAP_SEL_ACTION, act_idx, + ri->actionset_sw_regs); + if (sw_idx == 0) + ri->vctrl->ops->cache_read(ri->ndev, admin, + VCAP_SEL_COUNTER, + ri->counter_id, 0); + ent_idx += ri->keyset_sw_regs; + act_idx += ri->actionset_sw_regs; + } + return 0; +} + /* Write VCAP cache content to the VCAP HW instance */ static int vcap_write_rule(struct vcap_rule_internal *ri) { @@ -1183,6 +1915,46 @@ void vcap_free_rule(struct vcap_rule *rule) } EXPORT_SYMBOL_GPL(vcap_free_rule); +struct vcap_rule *vcap_get_rule(struct vcap_control *vctrl, u32 id) +{ + struct vcap_rule_internal *elem; + struct vcap_rule_internal *ri; + int err; + + ri = NULL; + + err = vcap_api_check(vctrl); + if (err) + return ERR_PTR(err); + elem = vcap_lookup_rule(vctrl, id); + if (!elem) + return NULL; + mutex_lock(&elem->admin->lock); + ri = vcap_dup_rule(elem); + if (IS_ERR(ri)) + goto unlock; + err = vcap_read_rule(ri); + if (err) { + ri = ERR_PTR(err); + goto unlock; + } + err = vcap_decode_keyset(ri); + if (err) { + ri = ERR_PTR(err); + goto unlock; + } + err = vcap_decode_actionset(ri); + if (err) { + ri = ERR_PTR(err); + goto unlock; + } + +unlock: + mutex_unlock(&elem->admin->lock); + return (struct vcap_rule *)ri; +} +EXPORT_SYMBOL_GPL(vcap_get_rule); + /* Return the alignment offset for a new rule address */ static int vcap_valid_rule_move(struct vcap_rule_internal *el, int offset) { |