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@@ -296,126 +296,159 @@ static inline struct usbatm_vcc_data *usbatm_find_vcc(struct usbatm_data *instan
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return NULL;
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}
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-static void usbatm_extract_cells(struct usbatm_data *instance,
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- unsigned char *source, unsigned int avail_data)
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+static void usbatm_extract_one_cell(struct usbatm_data *instance, unsigned char *source)
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{
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- struct usbatm_vcc_data *cached_vcc = NULL;
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struct atm_vcc *vcc;
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struct sk_buff *sarb;
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- unsigned int stride = instance->rx_channel.stride;
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- int vci, cached_vci = 0;
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- short vpi, cached_vpi = 0;
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- u8 pti;
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+ short vpi = ((source[0] & 0x0f) << 4) | (source[1] >> 4);
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+ int vci = ((source[1] & 0x0f) << 12) | (source[2] << 4) | (source[3] >> 4);
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+ u8 pti = ((source[3] & 0xe) >> 1);
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- for (; avail_data >= stride; avail_data -= stride, source += stride) {
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- vpi = ((source[0] & 0x0f) << 4) | (source[1] >> 4);
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- vci = ((source[1] & 0x0f) << 12) | (source[2] << 4) | (source[3] >> 4);
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- pti = ((source[3] & 0xe) >> 1);
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+ vdbg("%s: vpi %hd, vci %d, pti %d", __func__, vpi, vci, pti);
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- vdbg("%s: vpi %hd, vci %d, pti %d", __func__, vpi, vci, pti);
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+ if ((vci != instance->cached_vci) || (vpi != instance->cached_vpi)) {
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+ instance->cached_vpi = vpi;
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+ instance->cached_vci = vci;
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- if ((vci != cached_vci) || (vpi != cached_vpi)) {
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- cached_vpi = vpi;
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- cached_vci = vci;
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+ instance->cached_vcc = usbatm_find_vcc(instance, vpi, vci);
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- cached_vcc = usbatm_find_vcc(instance, vpi, vci);
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+ if (!instance->cached_vcc)
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+ atm_rldbg(instance, "%s: unknown vpi/vci (%hd/%d)!\n", __func__, vpi, vci);
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+ }
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- if (!cached_vcc)
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- atm_rldbg(instance, "%s: unknown vpi/vci (%hd/%d)!\n", __func__, vpi, vci);
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- }
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+ if (!instance->cached_vcc)
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+ return;
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- if (!cached_vcc)
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- continue;
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+ vcc = instance->cached_vcc->vcc;
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- vcc = cached_vcc->vcc;
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+ /* OAM F5 end-to-end */
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+ if (pti == ATM_PTI_E2EF5) {
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+ if (printk_ratelimit())
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+ atm_warn(instance, "%s: OAM not supported (vpi %d, vci %d)!\n",
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+ __func__, vpi, vci);
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+ atomic_inc(&vcc->stats->rx_err);
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+ return;
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+ }
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- /* OAM F5 end-to-end */
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- if (pti == ATM_PTI_E2EF5) {
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- if (printk_ratelimit())
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- atm_warn(instance, "%s: OAM not supported (vpi %d, vci %d)!\n",
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- __func__, vpi, vci);
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- atomic_inc(&vcc->stats->rx_err);
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- continue;
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- }
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+ sarb = instance->cached_vcc->sarb;
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- sarb = cached_vcc->sarb;
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+ if (sarb->tail + ATM_CELL_PAYLOAD > sarb->end) {
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+ atm_rldbg(instance, "%s: buffer overrun (sarb->len %u, vcc: 0x%p)!\n",
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+ __func__, sarb->len, vcc);
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+ /* discard cells already received */
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+ skb_trim(sarb, 0);
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+ UDSL_ASSERT(sarb->tail + ATM_CELL_PAYLOAD <= sarb->end);
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+ }
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- if (sarb->tail + ATM_CELL_PAYLOAD > sarb->end) {
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- atm_rldbg(instance, "%s: buffer overrun (sarb->len %u, vcc: 0x%p)!\n",
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- __func__, sarb->len, vcc);
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- /* discard cells already received */
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- skb_trim(sarb, 0);
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- UDSL_ASSERT(sarb->tail + ATM_CELL_PAYLOAD <= sarb->end);
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- }
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+ memcpy(sarb->tail, source + ATM_CELL_HEADER, ATM_CELL_PAYLOAD);
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+ __skb_put(sarb, ATM_CELL_PAYLOAD);
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- memcpy(sarb->tail, source + ATM_CELL_HEADER, ATM_CELL_PAYLOAD);
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- __skb_put(sarb, ATM_CELL_PAYLOAD);
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+ if (pti & 1) {
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+ struct sk_buff *skb;
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+ unsigned int length;
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+ unsigned int pdu_length;
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- if (pti & 1) {
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- struct sk_buff *skb;
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- unsigned int length;
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- unsigned int pdu_length;
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+ length = (source[ATM_CELL_SIZE - 6] << 8) + source[ATM_CELL_SIZE - 5];
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- length = (source[ATM_CELL_SIZE - 6] << 8) + source[ATM_CELL_SIZE - 5];
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+ /* guard against overflow */
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+ if (length > ATM_MAX_AAL5_PDU) {
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+ atm_rldbg(instance, "%s: bogus length %u (vcc: 0x%p)!\n",
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+ __func__, length, vcc);
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+ atomic_inc(&vcc->stats->rx_err);
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+ goto out;
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+ }
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- /* guard against overflow */
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- if (length > ATM_MAX_AAL5_PDU) {
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- atm_rldbg(instance, "%s: bogus length %u (vcc: 0x%p)!\n",
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- __func__, length, vcc);
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- atomic_inc(&vcc->stats->rx_err);
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- goto out;
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- }
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+ pdu_length = usbatm_pdu_length(length);
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- pdu_length = usbatm_pdu_length(length);
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+ if (sarb->len < pdu_length) {
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+ atm_rldbg(instance, "%s: bogus pdu_length %u (sarb->len: %u, vcc: 0x%p)!\n",
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+ __func__, pdu_length, sarb->len, vcc);
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+ atomic_inc(&vcc->stats->rx_err);
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+ goto out;
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+ }
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- if (sarb->len < pdu_length) {
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- atm_rldbg(instance, "%s: bogus pdu_length %u (sarb->len: %u, vcc: 0x%p)!\n",
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- __func__, pdu_length, sarb->len, vcc);
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- atomic_inc(&vcc->stats->rx_err);
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- goto out;
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- }
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+ if (crc32_be(~0, sarb->tail - pdu_length, pdu_length) != 0xc704dd7b) {
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+ atm_rldbg(instance, "%s: packet failed crc check (vcc: 0x%p)!\n",
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+ __func__, vcc);
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+ atomic_inc(&vcc->stats->rx_err);
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+ goto out;
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+ }
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- if (crc32_be(~0, sarb->tail - pdu_length, pdu_length) != 0xc704dd7b) {
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- atm_rldbg(instance, "%s: packet failed crc check (vcc: 0x%p)!\n",
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- __func__, vcc);
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- atomic_inc(&vcc->stats->rx_err);
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- goto out;
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- }
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+ vdbg("%s: got packet (length: %u, pdu_length: %u, vcc: 0x%p)", __func__, length, pdu_length, vcc);
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- vdbg("%s: got packet (length: %u, pdu_length: %u, vcc: 0x%p)", __func__, length, pdu_length, vcc);
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+ if (!(skb = dev_alloc_skb(length))) {
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+ if (printk_ratelimit())
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+ atm_err(instance, "%s: no memory for skb (length: %u)!\n",
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+ __func__, length);
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+ atomic_inc(&vcc->stats->rx_drop);
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+ goto out;
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+ }
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- if (!(skb = dev_alloc_skb(length))) {
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- if (printk_ratelimit())
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- atm_err(instance, "%s: no memory for skb (length: %u)!\n",
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- __func__, length);
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- atomic_inc(&vcc->stats->rx_drop);
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- goto out;
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- }
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+ vdbg("%s: allocated new sk_buff (skb: 0x%p, skb->truesize: %u)", __func__, skb, skb->truesize);
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- vdbg("%s: allocated new sk_buff (skb: 0x%p, skb->truesize: %u)", __func__, skb, skb->truesize);
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+ if (!atm_charge(vcc, skb->truesize)) {
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+ atm_rldbg(instance, "%s: failed atm_charge (skb->truesize: %u)!\n",
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+ __func__, skb->truesize);
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+ dev_kfree_skb_any(skb);
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+ goto out; /* atm_charge increments rx_drop */
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+ }
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- if (!atm_charge(vcc, skb->truesize)) {
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- atm_rldbg(instance, "%s: failed atm_charge (skb->truesize: %u)!\n",
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- __func__, skb->truesize);
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- dev_kfree_skb_any(skb);
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- goto out; /* atm_charge increments rx_drop */
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- }
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+ memcpy(skb->data, sarb->tail - pdu_length, length);
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+ __skb_put(skb, length);
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- memcpy(skb->data, sarb->tail - pdu_length, length);
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- __skb_put(skb, length);
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+ vdbg("%s: sending skb 0x%p, skb->len %u, skb->truesize %u",
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+ __func__, skb, skb->len, skb->truesize);
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- vdbg("%s: sending skb 0x%p, skb->len %u, skb->truesize %u",
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- __func__, skb, skb->len, skb->truesize);
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+ PACKETDEBUG(skb->data, skb->len);
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- PACKETDEBUG(skb->data, skb->len);
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+ vcc->push(vcc, skb);
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- vcc->push(vcc, skb);
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+ atomic_inc(&vcc->stats->rx);
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+ out:
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+ skb_trim(sarb, 0);
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+ }
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+}
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- atomic_inc(&vcc->stats->rx);
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- out:
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- skb_trim(sarb, 0);
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+static void usbatm_extract_cells(struct usbatm_data *instance,
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+ unsigned char *source, unsigned int avail_data)
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+{
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+ unsigned int stride = instance->rx_channel.stride;
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+ unsigned int buf_usage = instance->buf_usage;
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+
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+ /* extract cells from incoming data, taking into account that
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+ * the length of avail data may not be a multiple of stride */
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+
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+ if (buf_usage > 0) {
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+ /* we have a partially received atm cell */
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+ unsigned char *cell_buf = instance->cell_buf;
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+ unsigned int space_left = stride - buf_usage;
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+
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+ UDSL_ASSERT(buf_usage <= stride);
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+
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+ if (avail_data >= space_left) {
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+ /* add new data and process cell */
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+ memcpy(cell_buf + buf_usage, source, space_left);
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+ source += space_left;
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+ avail_data -= space_left;
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+ usbatm_extract_one_cell(instance, cell_buf);
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+ instance->buf_usage = 0;
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+ } else {
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+ /* not enough data to fill the cell */
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+ memcpy(cell_buf + buf_usage, source, avail_data);
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+ instance->buf_usage = buf_usage + avail_data;
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+ return;
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}
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}
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+
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+ for (; avail_data >= stride; avail_data -= stride, source += stride)
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+ usbatm_extract_one_cell(instance, source);
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+
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+ if (avail_data > 0) {
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+ /* length was not a multiple of stride -
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+ * save remaining data for next call */
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+ memcpy(instance->cell_buf, source, avail_data);
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+ instance->buf_usage = avail_data;
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+ }
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}
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@@ -496,16 +529,40 @@ static void usbatm_rx_process(unsigned long data)
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vdbg("%s: processing urb 0x%p", __func__, urb);
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if (usb_pipeisoc(urb->pipe)) {
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+ unsigned char *merge_start = NULL;
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+ unsigned int merge_length = 0;
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+ const unsigned int packet_size = instance->rx_channel.packet_size;
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int i;
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- for (i = 0; i < urb->number_of_packets; i++)
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- if (!urb->iso_frame_desc[i].status)
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- usbatm_extract_cells(instance,
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- (u8 *)urb->transfer_buffer + urb->iso_frame_desc[i].offset,
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- urb->iso_frame_desc[i].actual_length);
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- }
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- else
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+
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+ for (i = 0; i < urb->number_of_packets; i++) {
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+ if (!urb->iso_frame_desc[i].status) {
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+ unsigned int actual_length = urb->iso_frame_desc[i].actual_length;
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+
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+ UDSL_ASSERT(actual_length <= packet_size);
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+
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+ if (!merge_length)
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+ merge_start = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset;
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+ merge_length += actual_length;
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+ if (merge_length && (actual_length < packet_size)) {
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+ usbatm_extract_cells(instance, merge_start, merge_length);
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+ merge_length = 0;
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+ }
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+ } else {
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+ atm_rldbg(instance, "%s: status %d in frame %d!\n", __func__, urb->status, i);
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+ if (merge_length)
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+ usbatm_extract_cells(instance, merge_start, merge_length);
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+ merge_length = 0;
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+ instance->buf_usage = 0;
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+ }
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+ }
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+
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+ if (merge_length)
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+ usbatm_extract_cells(instance, merge_start, merge_length);
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+ } else
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if (!urb->status)
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usbatm_extract_cells(instance, urb->transfer_buffer, urb->actual_length);
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+ else
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+ instance->buf_usage = 0;
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if (usbatm_submit_urb(urb))
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return;
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@@ -797,6 +854,9 @@ static int usbatm_atm_open(struct atm_vcc *vcc)
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vcc->dev_data = new;
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tasklet_disable(&instance->rx_channel.tasklet);
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+ instance->cached_vcc = new;
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+ instance->cached_vpi = vpi;
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+ instance->cached_vci = vci;
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list_add(&new->list, &instance->vcc_list);
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tasklet_enable(&instance->rx_channel.tasklet);
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@@ -836,6 +896,11 @@ static void usbatm_atm_close(struct atm_vcc *vcc)
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down(&instance->serialize); /* vs self, usbatm_atm_open, usbatm_usb_disconnect */
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tasklet_disable(&instance->rx_channel.tasklet);
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+ if (instance->cached_vcc == vcc_data) {
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+ instance->cached_vcc = NULL;
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+ instance->cached_vpi = ATM_VPI_UNSPEC;
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+ instance->cached_vci = ATM_VCI_UNSPEC;
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+ }
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list_del(&vcc_data->list);
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tasklet_enable(&instance->rx_channel.tasklet);
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@@ -1146,6 +1211,16 @@ int usbatm_usb_probe(struct usb_interface *intf, const struct usb_device_id *id,
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__func__, urb->transfer_buffer, urb->transfer_buffer_length, urb);
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}
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+ instance->cached_vpi = ATM_VPI_UNSPEC;
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+ instance->cached_vci = ATM_VCI_UNSPEC;
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+ instance->cell_buf = kmalloc(instance->rx_channel.stride, GFP_KERNEL);
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+
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+ if (!instance->cell_buf) {
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+ dev_err(dev, "%s: no memory for cell buffer!\n", __func__);
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+ error = -ENOMEM;
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+ goto fail_unbind;
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+ }
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+
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if (!(instance->flags & UDSL_SKIP_HEAVY_INIT) && driver->heavy_init) {
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error = usbatm_heavy_init(instance);
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} else {
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@@ -1165,6 +1240,8 @@ int usbatm_usb_probe(struct usb_interface *intf, const struct usb_device_id *id,
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if (instance->driver->unbind)
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instance->driver->unbind(instance, intf);
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fail_free:
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+ kfree(instance->cell_buf);
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+
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for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
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if (instance->urbs[i])
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kfree(instance->urbs[i]->transfer_buffer);
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@@ -1236,6 +1313,8 @@ void usbatm_usb_disconnect(struct usb_interface *intf)
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usb_free_urb(instance->urbs[i]);
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}
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+ kfree(instance->cell_buf);
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+
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/* ATM finalize */
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if (instance->atm_dev)
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atm_dev_deregister(instance->atm_dev);
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