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head/sys/dev/e1000/igb_txrx.c
| Show First 20 Lines • Show All 327 Lines • ▼ Show 20 Lines | igb_isc_txd_credits_update(void *arg, uint16_t txqid, bool clear) | ||||
| * are descriptors to reclaim */ | * are descriptors to reclaim */ | ||||
| if (!clear) | if (!clear) | ||||
| return (1); | return (1); | ||||
| prev = txr->tx_cidx_processed; | prev = txr->tx_cidx_processed; | ||||
| ntxd = scctx->isc_ntxd[0]; | ntxd = scctx->isc_ntxd[0]; | ||||
| do { | do { | ||||
| delta = (int32_t)cur - (int32_t)prev; | delta = (int32_t)cur - (int32_t)prev; | ||||
| /* | |||||
| * XXX This appears to be a hack for first-packet. | |||||
| * A correct fix would prevent prev == cur in the first place. | |||||
| */ | |||||
| MPASS(prev == 0 || delta != 0); | MPASS(prev == 0 || delta != 0); | ||||
| if (prev == 0 && cur == 0) | |||||
| delta += 1; | |||||
| if (delta < 0) | if (delta < 0) | ||||
| delta += ntxd; | delta += ntxd; | ||||
| processed += delta; | processed += delta; | ||||
| prev = cur; | prev = cur; | ||||
| rs_cidx = (rs_cidx + 1) & (ntxd-1); | rs_cidx = (rs_cidx + 1) & (ntxd-1); | ||||
| if (rs_cidx == txr->tx_rs_pidx) | if (rs_cidx == txr->tx_rs_pidx) | ||||
| break; | break; | ||||
| ▲ Show 20 Lines • Show All 235 Lines • Show Last 20 Lines | |||||